CN106936358A - The control method and device of linear electric motors - Google Patents
The control method and device of linear electric motors Download PDFInfo
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- CN106936358A CN106936358A CN201511025836.8A CN201511025836A CN106936358A CN 106936358 A CN106936358 A CN 106936358A CN 201511025836 A CN201511025836 A CN 201511025836A CN 106936358 A CN106936358 A CN 106936358A
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- 230000005611 electricity Effects 0.000 claims description 6
- 238000001514 detection method Methods 0.000 description 13
- 230000004044 response Effects 0.000 description 3
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- 238000005516 engineering process Methods 0.000 description 2
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
- H02P23/10—Controlling by adding a DC current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
- H02P25/06—Linear motors
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Multiple Motors (AREA)
- Control Of Linear Motors (AREA)
Abstract
The present invention provides a kind of control method and device of linear electric motors.Wherein method includes：First switch device and second switch break-over of device in control unit control inversion bridge circuit, so as to export the direct current of positive direction to linear electric motors；The 3rd switching device and the 4th switch device conductive in control unit control inversion bridge circuit, so as to export the direct current of negative direction to linear electric motors.Control unit passes through the conducting and disconnection of inversion bridge circuit breaker in middle device sequentially, apply positive and negative alternate intermittent continuous current voltage to linear electric motors, so that linear compressor natural commutation, realize that the automatic of resonant frequency follows, therefore the algorithm of complexity need not be reused to detect resonant frequency, the development difficulty of control unit is greatly reduced.
Description
Technical field
The present invention relates to motor control technology field, the control method and dress of more particularly to a kind of linear electric motors
Put.
Background technology
Exported using sine wave control, i.e. controller more than current linear electric motors and linear compressor and give motor two ends
Voltage be by PWM (Pulse Width Modulation, pulse width modulation) ripple of Sine Modulated,
As shown in Figure 1.When being controlled using sine wave, the given Sine Modulated wave frequency rate, of controller is exactly motor
Running frequency, the frequency needs to be consistent with the resonant frequency of linear compressor, can just make the efficiency of motor
Highest.Linear electric motors are generally made using the resonant frequency method of position sensor detection of straight lines compressor at present
The resonant frequency of running frequency and linear compressor is consistent, but space inside compressor is limited, uncomfortable
Installation site sensor is closed, and the reliability of position sensor detection is not also high, therefore be gradually eliminated.And
The method of detection of straight lines compressor resonant frequency is usually relatively complex in the case of without position sensor, control
The development difficulty of device processed is than larger.
The content of the invention
In consideration of it, being necessary, for the complicated problem of traditional detection of straight lines compressor resonant frequency method, to carry
Can just make linear compressor natural commutation for a kind of algorithm without complexity, realize what resonant frequency was followed automatically
The control method and device of linear electric motors.
To reach goal of the invention, there is provided a kind of control method of linear electric motors, methods described includes：
First switch device and second switch break-over of device in control unit control inversion bridge circuit, so as to give
Linear electric motors export the direct current of positive direction；
Described control unit controls the 3rd switching device and the 4th switching device in the inversion bridge circuit to lead
It is logical, so as to export the direct current of negative direction to the linear electric motors；
Wherein, the first end of the first switch device is connected with the positive pole of described control unit, the second end with
The first end connection of the linear electric motors；The first end of the second switch device and the of the linear electric motors
Two ends connect, and the second end is connected with the negative pole of described control unit；The first end of the 3rd switching device with
The positive pole connection of described control unit, the second end is connected with the second end of the linear electric motors；Described 4th opens
The first end for closing device is connected with the first end of the linear electric motors, the negative pole of the second end and described control unit
Connection.
Wherein in one embodiment, described control unit controls the first switch device and described second to open
Close break-over of device first and preset ON time；
Described control unit control the 3rd switching device and the 4th switch device conductive second are preset and are led
The logical time.
Wherein in one embodiment, the first switch device in described control unit control inversion bridge circuit
After presetting ON time with second switch break-over of device first, also include：
Described control unit controls the first switch device shut-off, and the linear electric motors are opened by described second
Close the 4th one way conducting device electric discharge in device and the inverter bridge turning circuit；Or described control unit
The second switch device is controlled to turn off, the linear electric motors are by the first switch device and the inversion
The 3rd one way conducting device electric discharge in bridge turning circuit, until electric discharge terminates；
The 3rd switching device and the 4th switching device in described control unit controls the inversion bridge circuit are led
After logical second default ON time, also include：
Described control unit controls the 3rd switching device shut-off, and the linear electric motors are opened by the described 4th
Close the second one way conducting device electric discharge in device and the inversion bridge circuit, or described control unit control
The 4th switching device shut-off, the linear electric motors are by the 3rd switching device and inverter bridge electricity
The first one way conducting device electric discharge in road, until electric discharge terminates；
Wherein, first one way conducting device is in parallel with the first switch device, and described second unidirectionally leads
Logical device is in parallel with the second switch device, the 3rd one way conducting device and the 3rd switching device
Parallel connection, the 4th one way conducting device is in parallel with the 4th switching device.
Wherein in one embodiment, the linear electric motors are being performed by the second switch device and described
4th one way conducting device is discharged or is put by the first switch device and the 3rd one way conducting device
Electricity, until after the step of electric discharge terminates, also including：
Described control unit controls all of switching device shut-off, and detects the first anti-electricity of the linear electric motors
Kinetic potential, when first back electromotive force zero-crossing is detected, described control unit control the 3rd switch
Device and the 4th switch device conductive second preset ON time, so that negative to linear electric motors output
The direct current in direction；
Discharged by the 4th switching device and second one way conducting device the linear electric motors are performed
Or the linear electric motors by the 3rd switching device and first one way conducting device the step of discharged
When, also include：
Described control unit controls all of switching device shut-off, and detects the second anti-electricity of the linear electric motors
Kinetic potential, when second back electromotive force zero-crossing is detected, described control unit controls the first switch
Device and the second switch break-over of device first preset ON time, so as to linear electric motors output just
The direct current in direction.
Wherein in one embodiment, after the step of detecting first back electromotive force zero-crossing, also
Including：
Delay time is preset in time delay first；
After the step of detecting second back electromotive force zero-crossing, also include：
Delay time is preset in time delay second.
Wherein in one embodiment, the linear electric motors are by the second switch device and the 4th list
Discharged to conduction device or discharged by the first switch device and the 3rd one way conducting device, directly
The step of terminating to electric discharge includes：
The first electric current of the linear electric motors is detected, judges whether first electric current is 0；
If so, then judging that the linear electric motors electric discharge terminates；
Described control unit calculates the first discharge time of first electric current；
The linear electric motors are discharged by the 4th switching device and second one way conducting device, or
Discharged by the 3rd switching device and first one way conducting device, until the step of electric discharge terminates is wrapped
Include：
The second electric current of the linear electric motors is detected, judges whether second electric current is 0；
If so, then judging that the linear electric motors electric discharge terminates；
Described control unit calculates the second discharge time of second electric current.
The present invention also provides a kind of control device of linear electric motors, and described device includes：
Control unit, for controlling first switch device and second switch break-over of device in inversion bridge circuit,
So as to export the direct current of positive direction to linear electric motors；
Described control unit, is additionally operable to control the 3rd switching device and the 4th switch in the inversion bridge circuit
Break-over of device, so as to export the direct current of negative direction to the linear electric motors；
Wherein, the first end of the first switch device is connected with the positive pole of described control unit, the second end with
The first end connection of the linear electric motors；The first end of the second switch device and the of the linear electric motors
Two ends connect, and the second end is connected with the negative pole of described control unit；The first end of the 3rd switching device with
The positive pole connection of described control unit, the second end is connected with the second end of the linear electric motors；Described 4th opens
The first end for closing device is connected with the first end of the linear electric motors, the negative pole of the second end and described control unit
Connection.
Wherein in one embodiment, described control unit is used to control the first switch device and described the
Two switch device conductives first preset ON time；
Described control unit is used to control the 3rd switching device and the 4th switch device conductive second pre-
If ON time.
Wherein in one embodiment, described control unit is additionally operable to control first opening in inversion bridge circuit
Pass device and second switch break-over of device first are preset after ON time, control the first switch device to close
Disconnected, the linear electric motors are unidirectional by the 4th in the second switch device and the inverter bridge turning circuit
Conduction device discharges；Or described control unit controls the second switch device shut-off, the linear electric motors
Discharged by the 3rd one way conducting device in the first switch device and the inverter bridge turning circuit, directly
Terminate to electric discharge；
Described control unit, is additionally operable to the 3rd switch in described control unit controls the inversion bridge circuit
Device and the 4th switch device conductive second are preset after ON time, control the 3rd switching device shut-off,
The linear electric motors are by the second one way conducting device in the 4th switching device and the inversion bridge circuit
Electric discharge, or described control unit controls the 4th switching device shut-off, and the linear electric motors are by described
The first one way conducting device electric discharge in 3rd switching device and the inversion bridge circuit, until electric discharge terminates；
Wherein, first one way conducting device is in parallel with the first switch device, and described second unidirectionally leads
Logical device is in parallel with the second switch device, the 3rd one way conducting device and the 3rd switching device
Parallel connection, the 4th one way conducting device is in parallel with the 4th switching device.
Wherein in one embodiment, described control unit is additionally operable to pass through described second in the linear electric motors
Switching device and the 4th one way conducting device discharge or by the first switch device and the described 3rd
One way conducting device discharges, until after electric discharge terminates, controlling all of switching device shut-off, and detect institute
The first counter electromotive force of linear electric motors is stated, when first back electromotive force zero-crossing is detected, control is described
3rd switching device and the 4th switch device conductive second preset ON time；
Described control unit is additionally operable in the linear electric motors by the 4th switching device and second list
Pass through the 3rd switching device and first one-way conduction to conduction device electric discharge or the linear electric motors
Device discharges, until after electric discharge terminates, controlling all of switching device shut-off, and detect the straight-line electric
Second counter electromotive force of machine, when second back electromotive force zero-crossing is detected, controls the first switch
Device and the second switch break-over of device first preset ON time.
Wherein in one embodiment, described control unit is additionally operable to detecting the first counter electromotive force mistake
After zero point, delay time is preset in time delay first；
Described control unit is additionally operable to after second back electromotive force zero-crossing is detected, and time delay second is pre-
If delay time.
Wherein in one embodiment, described control unit is additionally operable to detect the first electric current of the linear electric motors,
Judge whether first electric current is 0；If so, then judging that the linear electric motors electric discharge terminates, and calculate described
First discharge time of the first electric current；
Described control unit is additionally operable to detect the second electric current of the linear electric motors, judges that second electric current is
No is 0；If so, then judging that the linear electric motors electric discharge terminates；And calculate the second electric discharge of second electric current
Time.
Beneficial effects of the present invention include：
The control method and device of above-mentioned linear electric motors, control unit is by inversion bridge circuit breaker in middle device
Conducting and disconnection sequentially, positive and negative alternate intermittent continuous current voltage are applied to linear electric motors, so that straight line compresses
Machine natural commutation, realizes that the automatic of resonant frequency follows, therefore it is humorous to detect to reuse the algorithm of complexity
Vibration frequency, greatly reduces the development difficulty of control unit.Meanwhile, also overcome position-sensor-free resonance
The problem that frequency detecting low-response, anti-interference are poor, precision is low.And driven using sinusoidal ac with tradition
The method of dynamic linear electric motors is compared, and without increasing electric capacity, reduces cost.
Brief description of the drawings
Terminal voltage waveform diagram when Fig. 1 is the linear electric motors sine control in one embodiment；
Fig. 2 is the schematic flow sheet of the control method of the linear electric motors in one embodiment；
Fig. 3 is the schematic flow sheet of the control method of the linear electric motors in another embodiment；
Fig. 4 is the structural representation of the control device of the linear electric motors in one embodiment；
Fig. 5 is the schematic diagram of the inversion bridge circuit in the control device of the linear electric motors in one embodiment；
Fig. 6 is the voltage waveform view of the linear electric motors in one embodiment.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, below in conjunction with accompanying drawing and reality
Example is applied to be further elaborated the control method and device of linear electric motors of the present invention.It should be appreciated that this
The described specific embodiment in place is only used to explain the present invention, is not intended to limit the present invention.
In one embodiment, as shown in Figure 2, there is provided a kind of control method of linear electric motors, the method
Including：
S100, first switch device VT1 and second switch device in control unit control inversion bridge circuit
VT2 is turned on, so as to export the direct current of positive direction to linear electric motors M.
S200, the 3rd switching device VT3 and the 4th switching device in control unit control inversion bridge circuit
VT4 is turned on, so as to export the direct current of negative direction to linear electric motors M.
Wherein, the first end of first switch device VT1 is connected with the positive pole of control unit, the second end and straight line
The first end connection of motor M；The first end of second switch device VT2 connects with the second end of the linear electric motors
Connect, the second end is connected with the negative pole of control unit；The first end of the 3rd switching device VT3 is single with the control
The positive pole connection of unit, the second end is connected with the second end of the linear electric motors；The of 4th switching device VT4
One end is connected with the first end of the linear electric motors M, and the second end is connected with the negative pole of control unit.
In the present embodiment, control unit passes through the conducting and disconnection of inversion bridge circuit breaker in middle device sequentially, to
Linear electric motors apply positive and negative alternate intermittent continuous current voltage, so that linear compressor natural commutation, realizes humorous
The automatic of vibration frequency follows, therefore need not reuse the algorithm of complexity and detect resonant frequency, greatly reduces
The development difficulty of control unit.Meanwhile, also overcome position-sensor-free resonant frequency detection low-response, resist
The problem that interference is poor, precision is low.Wherein, switching device is switching tube.
What deserves to be explained is, the voltage equation of traditional linear electric motors isWherein, U
It is terminal voltage, i is coil current, and x is the displacement of mover, and R is coil resistance, and L is coil inductance, K0
It is back emf coefficient.When using simple alternating current electric drive linear electric motors, due to the power factor of linear electric motors
Low (due to linear electric motors characteristic in itself, its inductance coefficent is than larger), therefore, the electricity of control unit output
Pressure is greatly all consumed on inductance, and especially the coil current i and running frequency in linear electric motors compare
When big, the voltage of linear electric motors easily reaches saturation.In order to solve this problem, generally one exchange of series connection
To improve the power factor of linear electric motors, after series capacitance, the voltage equation of linear electric motors is changed into electric capacityWherein, C is the capacitance of the electric capacity of series connection, but uses series electrical
Hold, often increased cost.And in the present embodiment control unit output be positive and negative alternate direct current, with
The power factor of the motor of straight line is unrelated, therefore need not increase electric capacity, reduces cost.
In one embodiment, control unit control first switch device VT1 and second switch device VT2 leads
Logical first default ON time t1.Control unit controls the 3rd switching device VT3 and the 4th switching device VT4
The default ON time t4 of conducting second.
The first default default ON time t4 of ON time t1 and second are control units defeated to linear electric motors M
Go out the galvanic time, the first default default ON time t4 of ON time t1 and second determine that straight line compresses
The stroke of machine piston, in actual operation, leads by the way that the default ON time t1 and second of regulation first is default
The length of logical time t4 controls the stroke of piston, so as to realize linear compressor movement travel and top dead centre
Control.When linear electric motors M just starts, in order to prevent the occurrence of hitting cylinder, during by the first default conducting
Between t1 set it is as small as possible.
In one embodiment, referring to Fig. 3, after step S100, also include：
S110, control unit control first switch device VT1 shut-offs, linear electric motors M passes through second switch device
The 4th one way conducting device D4 electric discharges in part VT2 and inverter bridge turning circuit；Or control unit control
Second switch device VT2 is turned off, and linear electric motors M passes through first switch device VT1 and inverter bridge electric conduction
The 3rd one way conducting device D3 electric discharges in road, until electric discharge terminates.
After step S200, also include：
S210, control unit controls the 3rd switching device VT3 shut-offs, and linear electric motors M passes through the 4th derailing switch
The second one way conducting device D2 electric discharges in part VT4 and inversion bridge circuit, or control unit control the 4th
Switching device VT4 is turned off, and linear electric motors M is by the in the 3rd switching device VT3 and inversion bridge circuit
One one way conducting device D1 discharges, until electric discharge terminates.
Wherein, the first one way conducting device D1 is in parallel with first switch device VT1, the second one-way conduction device
Part D2 is in parallel with second switch device VT2, the 3rd one way conducting device D3 and the 3rd switching device VT3
Parallel connection, the 4th one way conducting device D4 is in parallel with the 4th switching device VT4.
Electric current in linear electric motors is discharged, so as to there is no electric current in linear electric motors, is easy to subsequent detection
The opposition electromotive force of linear electric motors.Wherein, one way conducting device is diode.Preferably, diode is continuous
Stream diode.
In one embodiment, after step silo, also include：
S120, control unit controls the shut-off of all of switching device, and detects the first anti-of the linear electric motors
Electromotive force, when the first back electromotive force zero-crossing is detected, control unit performs step S200.
After step S210, also include：S220, control unit controls all of switching device shut-off, and
Second counter electromotive force of detection of straight lines motor, when the second back electromotive force zero-crossing is detected, performs step
S100。
In description more than, control unit is interrupted galvanic to linear electric motors applying, is not being had
It is the free vibration in the presence of spring force and gas force to have the galvanic time linear electric motors of applying, therefore,
The resonant frequency information that back electromotive force zero-crossing has actually contained system is detected, control unit need not
Recycle the algorithm of sensor or complexity to detect resonant frequency, greatly reduce the development difficulty of control unit.
In one embodiment, after step S120, also including S130, delay time is preset in time delay first
t3。
After step S220, also including S230：Delay time t6 is preset in time delay second.
The first default default delay time t6 of delay time t3 and second are the counter electromotive force for detecting linear electric motors
To the time of control unit output voltage after zero crossing, during this period, linear electric motors M is by spring force traction
Motion, therefore the first default default delay time t6 of delay time t3 and second can not be oversize, can otherwise lead
Cause linear electric motors out of service or commutate again.
In one embodiment, step S110 includes：The first electric current of the linear electric motors is detected, institute is judged
State whether the first electric current is 0；If so, then judging that linear electric motors electric discharge terminates, calculate the first electric current first is put
Electric time t2.
Step S210 includes：Second electric current of detection of straight lines motor, judges whether the second electric current is 0；If so,
Then judge that linear electric motors M electric discharges terminate, calculate the second discharge time t5 of the second electric current.
The the first discharge time t2 and the second discharge time t5 for obtaining linear electric motors M can be obtained easier
The voltage waveform of linear electric motors, the voltage waveform of linear electric motors is as shown in Figure 6.Terminate in discharge time simultaneously
The just counter electromotive force of detection of straight lines motor afterwards, it is to avoid non-essential detection.
In one embodiment, a kind of control device of linear electric motors is additionally provided, referring to Fig. 4, Fig. 5, should
Device includes：Control unit 100, for control first switch device VT1 in inversion bridge circuit 200 and
Second switch device VT2 is turned on, so as to export the direct current of positive direction to linear electric motors.Control unit 100,
It is additionally operable to control the 3rd switching device and the 4th switch device conductive in inversion bridge circuit, so as to give straight-line electric
Machine exports the direct current of negative direction.Wherein, the positive pole of the first end of first switch device VT1 and control unit
Connection, the second end is connected with the first end of linear electric motors M；The first end of second switch device VT2 with it is described
The second end connection of linear electric motors, the second end is connected with the negative pole of control unit；3rd switching device VT3's
First end is connected with the positive pole of described control unit, and the second end is connected with the second end of the linear electric motors；The
The first end of four switching device VT4 is connected with the first end of the linear electric motors M, the second end and control unit
Negative pole connection.
Control unit passes through the conducting and disconnection of inversion bridge circuit breaker in middle device sequentially, applies to linear electric motors
Positive and negative alternate intermittent continuous current voltage, so that linear compressor natural commutation, realizes the automatic of resonant frequency
Follow, therefore the algorithm of complexity need not be reused and detect resonant frequency, greatly reduce opening for control unit
Degree of raising difficult questions.Meanwhile, also overcome position-sensor-free resonant frequency detection low-response, anti-interference poor, smart
The low problem of degree.And control unit output is positive and negative alternate direct current in the present embodiment, with straight line
The power factor of motor is unrelated, therefore need not increase electric capacity, reduces cost.
In one embodiment, control unit 100 is used to control first switch device VT1 and second switch device
The default ON time t1 of part VT2 conductings first.Control unit 100 be used for control the 3rd switching device VT3 and
The default ON time t4 of 4th switching device VT4 conductings second.
In one embodiment, control unit 100, are additionally operable to control the first switch device in inversion bridge circuit
After ON time being preset with second switch break-over of device first, the VT1 shut-offs of control first switch device, directly
Line motor M is by the 4th one way conducting device D4 in second switch device VT2 and inverter bridge turning circuit
Electric discharge；Or the VT2 shut-offs of control second switch device, linear electric motors M is by first switch device VT1
Discharged with the 3rd one way conducting device D3 in inverter bridge turning circuit, until electric discharge terminates.
Control unit 100, is additionally operable to the 3rd switching device and the 4th switching device in inversion bridge circuit is controlled
After the default ON time of conducting second, control the 3rd switching device VT3 shut-offs, linear electric motors M is by the
The second one way conducting device D2 electric discharges in four switching device VT4 and inversion bridge circuit, or control the 4th
Switching device VT4 is turned off, and linear electric motors M is by the in the 3rd switching device VT3 and inversion bridge circuit
One one way conducting device D1 discharges, until electric discharge terminates.
Wherein, the first one way conducting device D1 is in parallel with first switch device VT1, the second one-way conduction device
Part D2 is in parallel with second switch device VT2, the 3rd one way conducting device D3 and the 3rd switching device VT3
Parallel connection, the 4th one way conducting device D4 is in parallel with the 4th switching device VT4.
In one embodiment, control unit 100 be additionally operable to linear electric motors M by second switch device and
4th one way conducting device is discharged or is discharged by first switch device and the 3rd one way conducting device,
Until after electric discharge terminates, the shut-off of all of switching device is controlled, and detect the first anti-of the linear electric motors
Electromotive force, when first back electromotive force zero-crossing is detected, controls the 3rd switching device and the described 4th
Switch device conductive.
Control unit 100 is additionally operable in the linear electric motors by the 4th switching device and second list
Pass through the 3rd switching device and first one-way conduction to conduction device electric discharge or the linear electric motors
Device discharges, until after electric discharge terminates, controlling all of switching device shut-off, and detect the straight-line electric
Second counter electromotive force of machine, when second back electromotive force zero-crossing is detected, controls the first switch
Device and the second switch break-over of device.
In one embodiment, control unit 100 is additionally operable to after the first back electromotive force zero-crossing is detected,
Delay time t3 is preset in time delay first.Control unit 100 is additionally operable to detecting the second counter electromotive force mistake
After zero point, delay time t6 is preset in time delay second.
In one embodiment, control unit 100 is additionally operable to first electric current of detection of straight lines motor M, judges
Whether the first electric current is 0；If so, then judge that linear electric motors M electric discharge terminates, and calculate the of the first electric current
One discharge time t2.Control unit 100 is additionally operable to second electric current of detection of straight lines motor M, judges the second electricity
Whether stream is 0；If so, then judging that linear electric motors M electric discharges terminate；And calculate the second electric discharge of the second electric current
Time t5.
Because the principle of the method solve problem is similar to a kind of foregoing control device of linear electric motors, therefore should
The implementation of method may refer to the implementation of preceding method, repeats part and repeats no more.
One of ordinary skill in the art will appreciate that all or part of flow in realizing above-described embodiment method,
Computer program be can be by instruct the hardware of correlation to complete, described program can be stored in a calculating
In machine read/write memory medium, the program is upon execution, it may include such as the flow of the embodiment of above-mentioned each method.
Wherein, described storage medium can for magnetic disc, CD, read-only memory (Read-Only Memory,
) or random access memory (Random Access Memory, RAM) etc. ROM.
Each technical characteristic of embodiment described above can be combined arbitrarily, not right to make description succinct
The all possible combination of each technical characteristic in above-described embodiment is all described, as long as however, these skills
The combination of art feature does not exist contradiction, is all considered to be the scope of this specification record.
Embodiment described above only expresses several embodiments of the invention, and its description is more specific and detailed,
But can not therefore be construed as limiting the scope of the patent.It should be pointed out that for this area
For those of ordinary skill, without departing from the inventive concept of the premise, some deformations can also be made and changed
Enter, these belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be with appended power
Profit requires to be defined.
Claims (12)
1. a kind of control method of linear electric motors, it is characterised in that methods described includes：
First switch device and second switch break-over of device in control unit control inversion bridge circuit, so as to give
Linear electric motors export the direct current of positive direction；
Described control unit controls the 3rd switching device and the 4th switching device in the inversion bridge circuit to lead
It is logical, so as to export the direct current of negative direction to the linear electric motors；
Wherein, the first end of the first switch device is connected with the positive pole of described control unit, the second end with
The first end connection of the linear electric motors；The first end of the second switch device and the of the linear electric motors
Two ends connect, and the second end is connected with the negative pole of described control unit；The first end of the 3rd switching device with
The positive pole connection of described control unit, the second end is connected with the second end of the linear electric motors；Described 4th opens
The first end for closing device is connected with the first end of the linear electric motors, the negative pole of the second end and described control unit
Connection.
2. the control method of linear electric motors according to claim 1, it is characterised in that the control list
Unit's control first switch device and the second switch break-over of device first preset ON time；
Described control unit control the 3rd switching device and the 4th switch device conductive second are preset and are led
The logical time.
3. the control method of linear electric motors according to claim 1, it is characterised in that in the control
First switch device and second switch break-over of device first in unit control inversion bridge circuit preset ON time
Afterwards, also include：
Described control unit controls the first switch device shut-off, and the linear electric motors are opened by described second
Close the 4th one way conducting device electric discharge in device and the inverter bridge turning circuit；Or described control unit
The second switch device is controlled to turn off, the linear electric motors are by the first switch device and the inversion
The 3rd one way conducting device electric discharge in bridge turning circuit, until electric discharge terminates；
The 3rd switching device and the 4th switching device in described control unit controls the inversion bridge circuit are led
After logical second default ON time, also include：
Described control unit controls the 3rd switching device shut-off, and the linear electric motors are opened by the described 4th
Close the second one way conducting device electric discharge in device and the inversion bridge circuit, or described control unit control
The 4th switching device shut-off, the linear electric motors are by the 3rd switching device and inverter bridge electricity
The first one way conducting device electric discharge in road, until electric discharge terminates；
Wherein, first one way conducting device is in parallel with the first switch device, and described second unidirectionally leads
Logical device is in parallel with the second switch device, the 3rd one way conducting device and the 3rd switching device
Parallel connection, the 4th one way conducting device is in parallel with the 4th switching device.
4. the control method of linear electric motors according to claim 3, it is characterised in that described performing
Linear electric motors are discharged or by described the by the second switch device and the 4th one way conducting device
One switching device and the 3rd one way conducting device discharge, until after the step of electric discharge terminates, also including：
Described control unit controls all of switching device shut-off, and detects the first anti-electricity of the linear electric motors
Kinetic potential, when first back electromotive force zero-crossing is detected, described control unit control the 3rd switch
Device and the 4th switch device conductive second preset ON time, so that negative to linear electric motors output
The direct current in direction；
Discharged by the 4th switching device and second one way conducting device the linear electric motors are performed
Or the linear electric motors by the 3rd switching device and first one way conducting device the step of discharged
When, also include：
Described control unit controls all of switching device shut-off, and detects the second anti-electricity of the linear electric motors
Kinetic potential, when second back electromotive force zero-crossing is detected, described control unit controls the first switch
Device and the second switch break-over of device first preset ON time, so as to linear electric motors output just
The direct current in direction.
5. the control method of linear electric motors according to claim 4, it is characterised in that detecting
After the step of stating the first back electromotive force zero-crossing, also include：
Delay time is preset in time delay first；
After the step of detecting second back electromotive force zero-crossing, also include：
Delay time is preset in time delay second.
6. the control method of linear electric motors according to claim 4, it is characterised in that the straight-line electric
Machine is discharged or by the first switch by the second switch device and the 4th one way conducting device
Device and the 3rd one way conducting device discharge, until electric discharge includes the step of end：
The first electric current of the linear electric motors is detected, judges whether first electric current is 0；
If so, then judging that the linear electric motors electric discharge terminates；
Described control unit calculates the first discharge time of first electric current；
The linear electric motors are discharged by the 4th switching device and second one way conducting device, or
Discharged by the 3rd switching device and first one way conducting device, until the step of electric discharge terminates is wrapped
Include：
The second electric current of the linear electric motors is detected, judges whether second electric current is 0；
If so, then judging that the linear electric motors electric discharge terminates；
Described control unit calculates the second discharge time of second electric current.
7. a kind of control device of linear electric motors, it is characterised in that described device includes：
Control unit (100), for controlling the first switch device and second in inversion bridge circuit (200) to open
Break-over of device is closed, so as to export the direct current of positive direction to linear electric motors；
Described control unit (100), is additionally operable to control the 3rd derailing switch in the inversion bridge circuit (200)
Part and the 4th switch device conductive, so as to export the direct current of negative direction to the linear electric motors；
Wherein, the first end of the first switch device is connected with the positive pole of described control unit, the second end with
The first end connection of the linear electric motors；The first end of the second switch device and the of the linear electric motors
Two ends connect, and the second end is connected with the negative pole of described control unit；The first end of the 3rd switching device with
The positive pole connection of described control unit, the second end is connected with the second end of the linear electric motors；Described 4th opens
The first end for closing device is connected with the first end of the linear electric motors, the negative pole of the second end and described control unit
Connection.
8. the control device of linear electric motors according to claim 7, it is characterised in that the control list
When first (100) are for controlling the first switch device and the second switch break-over of device first to preset conducting
Between；
Described control unit (100) is for controlling the 3rd switching device and the 4th switch device conductive
Second default ON time.
9. the control device of linear electric motors according to claim 8, it is characterised in that the control list
First (100), are additionally operable to control the first switch device and second switch break-over of device first in inversion bridge circuit
After default ON time, the first switch device shut-off is controlled, the linear electric motors pass through described second
The 4th one way conducting device electric discharge in switching device and the inverter bridge turning circuit；Or the control list
Unit's control second switch device shut-off, the linear electric motors are by the first switch device and described inverse
Become the 3rd one way conducting device electric discharge in bridge turning circuit, until electric discharge terminates；
Described control unit (100), is additionally operable in described control unit controls the inversion bridge circuit the
Three switching devices and the 4th switch device conductive second are preset after ON time, control the 3rd derailing switch
Part is turned off, and the linear electric motors are unidirectional by second in the 4th switching device and the inversion bridge circuit
Conduction device discharges, or described control unit controls the 4th switching device shut-off, the linear electric motors
Discharged by the first one way conducting device in the 3rd switching device and the inversion bridge circuit, until putting
Electricity terminates；
Wherein, first one way conducting device is in parallel with the first switch device, and described second unidirectionally leads
Logical device is in parallel with the second switch device, the 3rd one way conducting device and the 3rd switching device
Parallel connection, the 4th one way conducting device is in parallel with the 4th switching device.
10. the control device of linear electric motors according to claim 9, it is characterised in that the control
Unit (100) is additionally operable to pass through the second switch device and the 4th one-way conduction in the linear electric motors
Device is discharged or is discharged by the first switch device and the 3rd one way conducting device, until electric discharge
After end, control all of switching device to turn off, and detect the first counter electromotive force of the linear electric motors,
When first back electromotive force zero-crossing is detected, the 3rd switching device and the 4th switch are controlled
Break-over of device second presets ON time；
Described control unit (100) is additionally operable in the linear electric motors by the 4th switching device and described
Second one way conducting device discharges or the linear electric motors are by the 3rd switching device and first list
Discharged to conduction device, until after electric discharge terminates, controlling all of switching device shut-off, and detect described
Second counter electromotive force of linear electric motors, when second back electromotive force zero-crossing is detected, controls described the
One switching device and the second switch break-over of device first preset ON time.
The control device of 11. linear electric motors according to claim 10, it is characterised in that the control
Unit (100) is additionally operable to after first back electromotive force zero-crossing is detected, and time delay is preset in time delay first
Time；
Described control unit (100) is additionally operable to after second back electromotive force zero-crossing is detected, time delay
Second default delay time.
The control device of 12. linear electric motors according to claim 10, it is characterised in that the control
Unit (100) is additionally operable to detect the first electric current of the linear electric motors, judges whether first electric current is 0；
If so, then judging that the linear electric motors electric discharge terminates, and calculate the first discharge time of first electric current；
Described control unit (100) is additionally operable to detect the second electric current of the linear electric motors, judges described second
Whether electric current is 0；If so, then judging that the linear electric motors electric discharge terminates；And calculate the of second electric current
Two discharge times.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201511025836.8A CN106936358A (en) | 2015-12-29 | 2015-12-29 | The control method and device of linear electric motors |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201511025836.8A CN106936358A (en) | 2015-12-29 | 2015-12-29 | The control method and device of linear electric motors |
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| CN201511025836.8A Pending CN106936358A (en) | 2015-12-29 | 2015-12-29 | The control method and device of linear electric motors |
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Application publication date: 20170707 |