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WO1997001882A1 - Moteur a champ magnetique axial, equipe d'une bobine fixe autour d'un rotor central - Google Patents

Moteur a champ magnetique axial, equipe d'une bobine fixe autour d'un rotor central Download PDF

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Publication number
WO1997001882A1
WO1997001882A1 PCT/US1996/010912 US9610912W WO9701882A1 WO 1997001882 A1 WO1997001882 A1 WO 1997001882A1 US 9610912 W US9610912 W US 9610912W WO 9701882 A1 WO9701882 A1 WO 9701882A1
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WO
WIPO (PCT)
Prior art keywords
rotor
poles
field
motor
generating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US1996/010912
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English (en)
Inventor
Robert Feldstein
Charles Powers
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to AU63410/96A priority Critical patent/AU6341096A/en
Publication of WO1997001882A1 publication Critical patent/WO1997001882A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K19/00—Synchronous motors or generators
    • H02K19/16—Synchronous generators
    • H02K19/22—Synchronous generators having windings each turn of which co-operates alternately with poles of opposite polarity, e.g. heteropolar generators
    • H02K19/24—Synchronous generators having windings each turn of which co-operates alternately with poles of opposite polarity, e.g. heteropolar generators with variable-reluctance soft-iron rotors without winding
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K19/00—Synchronous motors or generators
    • H02K19/02—Synchronous motors
    • H02K19/10—Synchronous motors for multi-phase current
    • H02K19/103—Motors having windings on the stator and a variable reluctance soft-iron rotor without windings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K19/00—Synchronous motors or generators
    • H02K19/16—Synchronous generators
    • H02K19/18—Synchronous generators having windings each turn of which co-operates only with poles of one polarity, e.g. homopolar generators
    • H02K19/20—Synchronous generators having windings each turn of which co-operates only with poles of one polarity, e.g. homopolar generators with variable-reluctance soft-iron rotors without winding
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/14—Stator cores with salient poles
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/24—Rotor cores with salient poles ; Variable reluctance rotors
    • H02K1/243—Rotor cores with salient poles ; Variable reluctance rotors of the claw-pole type
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
    • H02K29/03—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with a magnetic circuit specially adapted for avoiding torque ripples or self-starting problems
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/46—Fastening of windings on the stator or rotor structure
    • H02K3/52—Fastening salient pole windings or connections thereto
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K37/00—Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors
    • H02K37/02—Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors of variable reluctance type
    • H02K37/04—Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors of variable reluctance type with rotors situated within the stators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/173—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings

Definitions

  • This invention relates to the field of motors and generators, and more particularly, to brushless motors and generators which generate at least one common magnetic field, typically with a stationary coil, coaxial about the motor shaft, in addition to one or more other magnetic fields which share the magnetic circuit of the common field.
  • a motor structure which could be dynamically reconfigured, for example, as a torque motor, a stepper motor, a synchronous motor, or a generator.
  • a motor would preferably be extremely simple and economic to manufacture while still being able to achieve superior performance.
  • a motor has a rotatable shaft which may be nonferromagnetic with a ferromagnetic rotor secured to it.
  • the rotor has at least two and typically more rotor poles or a subset of the rotor poles.
  • One or more stationary axial coils are wrapped coaxially about the rotor or rotor magnetic extension for generating a magnetic field in all of the rotor poles. At least two and typically more stationary field poles having a field coil wrapped about each are disposed adjacent to the rotation surface swept by the rotor poles. Each of the field poles generates a magnetic field to magnetically interact with the magnetic field in the rotor poles .
  • a control system is provided for selectively energizing the stationary coils coaxial with the rotor and the field coils wrapped about the field poles.
  • a method of operating said motor comprises the steps of energizing the axial coil to generate a magnetic field in the rotor poles and also energizing the field coils to generate magnetic fields in the field poles.
  • the interaction of the rotor poles' magnetic fields with the field coils' magnetic fields causes the rotor to rotate.
  • the method also includes the step of selectively energizing the stationary coil and the two or more field coils.
  • an electric generator includes a shaft with a rotor secured thereto.
  • the rotor has a plurality of rotor poles.
  • An external power source rotates the shaft.
  • a stationary coil mounted axially about the shaft generates a magnetic field in the rotor poles.
  • Multiple field coils are provided about the rotor for generating electric power output.
  • a control system is provided for selectively energizing the stationary coil to cause the field coils to generate current.
  • a number of different embodiments are provided which incorporate the principles of using multiple stationary axial coils about multiple rotors, securing all the rotors to a common shaft, and providing each rotor with its own rotor poles and field poles for generating interacting magnetic fields that turn the common rotor motor shaft.
  • Figure 1 is a cut-away, cross sectioned view of a single-sided motor in accordance with a first embodiment of the invention
  • Figure 2 is a cut-away view along the line 2-2 of Figure 1;
  • Figure 3 is a cut-away, cross sectioned view of a double sided motor in accordance with a second embodiment of the invention;
  • Figure 4 is a cut-away view along line 4-4 of Figure 3 ;
  • Figure 5 is a cut-away, cross sectioned view of a motor having two rotor and three field poles in accordance with a third embodiment of the invention;
  • Figure 6 is a cut-away view along line 6-6 of Figure 5;
  • Figure 7A is a cut-away, cross sectioned view of a motor having six rotor poles in accordance with a third embodiment of the invention; and
  • Figure 7B is a cut-away view along line 7B-7B of Figure 7A.
  • FIGS. 1 and 2 of the drawings like elements are assigned like reference numbers, with suffixes A,B,C and D indicating 4 horizontal quadrants, and suffix E indicating upper half and suffix F indicating lower half.
  • Figures 1 and 2 are cut-away drawings of a single-sided motor system 10 incorporating the concept of the present invention.
  • Motor 10 has a stationary axial coil 12 about shaft 22 of rotor 14.
  • Rotor 14 has four rotor poles 16A, 16B,16C,16D (16A- 16D) extending out radially.
  • Four field coils 16A, 16B,16C,16D
  • 18A,18B, 18C, 18D are positioned about four field poles 20A, 20B, 20C,20D (20A-20D) which extend inward radially from yoke 24.
  • Motor 10 does not use brushes and is free of magnets, although magnets can be incorporated if they confer an advantage in a particular application.
  • the central concept shared by motor 10 with the other embodiments of the present invention relates to the use of a magnetic field generated by a stationary axial coil 12 disposed coaxially with shaft 22. Coil
  • the magnetic field generated by coil 12 interacts with several other magnetic fields imposed on field poles 20A-20D, which do not necessarily interact strongly with each other, but which share a magnetic circuit (or closed loop of magnetic flux) with the magnetic field generated by coil 12.
  • the magnetic fields imposed on field poles 20A-20D can be generated by various means, such as by field coils 18A-18D and/or by permanent magnets (not shown) which generate a magnetic field through field poles 20A- 20D.
  • Shaft 22 is preferably made of non-ferromagnetic material in applications utilizing more than one axial field coil to enhance separation.
  • the two opposite ends, 30E,30F of shaft 22 are supported by bearings 58E,58F comprising inner bearing races
  • bearings 58E,58F are preferably made of ferromagnetic material to help carry flux and minimize total loop reluctance into the total yoke/rotor circuit.
  • Shaft 22 is located at the center line of field poles 20A-20D and aligned perpendicular to the plane containing field poles 20A-20D.
  • Motor 10 has a cup-shaped ferromagnetic yoke 24 from which four stationary field poles 20A-20D extend inward towards shaft 22.
  • a field coil 18A-18D Around each field pole 20A- 20D is wound a field coil 18A-18D, respectively.
  • Each field coil 18A-18D is powered by control system 38 with individual coil outputs numbered to match the associated motor coils.
  • Control system 38 is typically controlled by means such as a microprocessor (not shown) .
  • Rotor 14 is substantially a cylindrical structure of ferromagnetic material securely mounted on shaft 22 between bearings 58E, 58F.
  • lobes 15A, 15B, 15C, 15D are contiguous with and extend radially outward from rotor 14 to form rotor poles 16A-16D, which typically have curved outer faces 17A, 17B, 17C, 17D (17A-17D) each with a convex shape that face corresponding curved outer faces 21A, 21B, 21C, 21D (21A-21D) with a concave shape of each the field poles 20A-20D.
  • the concave and convex curvatures 21A-21D and 17A-17D, respectively, are shaped to form an equal air gap 46A, 46B, 46C, 46D (46A-46D) therebetween.
  • Rotor 14 includes a rotor support 29, which is material that fills the space between rotor poles 20A-20D. It is preferably made of non-conductive, nonferromagnetic material such as plastic to eliminate eddy current losses. The separation between poles 20A-20D to each other is relatively large. Air gap 46A-46D between outer faces 17A-17D of rotor poles 16A-16D and outer faces 21A-21D of field poles 18A-18D is relative small, typically about .003 inches to about .005 inches.
  • Air gap 46A-46D provides the dominant reluctance in the magnetic circuit formed through axial coil 12, rotor 14, rotor poles 16A-16D, field poles 20A-20D, yoke 24, and bearing 58A.
  • a preferred direction of rotation and motor start-up can be provided by varying the arc length of rotor poles 16A-16D relative to the arc length of field poles 20A-20C or by varying the horizontal width of air gaps 46A-46D along their lengths.
  • Timing sequences there are many possible timing sequences to power motor 10.
  • One simple timing sequence is as follows: A constant DC current through axial coil 12 generates a constant magnetic field through rotor 14 and rotor poles 16A-16D.
  • Control system 38 activates all field coils 18A-18D in unison with constant DC current to generate a magnetic field in field poles 20A-20D opposing that in rotor poles 16A-16D.
  • the opposing magnetic fields cause rotor poles 16A-16D to be repelled from field poles 20A-20D so that rotor 14 rotates 1/8 turn.
  • control system 38 reverses the current flow through field coils 18A-18D, which in turn reverses the magnetic field in field poles 20A-20D.
  • Timing Sequence Two Poles at a Time
  • control system 38 maintains constant current through axial coil 12 and excites field coils 18A-18D as described above except that only two field coils are excited at a time, such that one pair only does the attracting (at the appropriate times) and the other pair only does the repelling.
  • Another Timing Sequence One Pole at a Timp Another possible timing sequence is as follows.
  • Control system 38 maintains constant current through axial coil 12. It sequentially excites each field coil 18A-18D with a brief square pulse (duration of less than 1/8 turn) , always with the same current direction such that each excitation causes only repulsion between the excited field pole (either of 18A-18D) and the nearest rotor pole (either of 16A- 16D) . Hence, there is no attraction step in this example, and rotor 14 rotates 1/4 turn with each excitation.
  • control system 38 excites each of the field coils 18A-18D with the same constant current.
  • rotor coil 12 is excited with a current direction that causes each rotor pole 16A-16D to be repelled by its corresponding field pole 20A-20D.
  • the current direction is reversed by control system 38 to cause each rotor pole 16A-16D to be attracted to the next field pole 20A-20D.
  • Rotor 14 rotates 1/4 turn with each repetition of this 2-step sequence similar to the four poles at a time example. More ⁇ T T.es ⁇ Field Poles than Rotor Poles Motor 10, described so far, has the same number of field poles as rotor poles.
  • the extra field pole(s) can serve as a tachometer pick-off for speed regulation or stepper control. It is also within the scope of the invention to use any momentarily unused field pole as a tachometer pick-off for speed regulation or stepper control.
  • motor 10 can serve as an electrical generator. This is accomplished by driving shaft 22 with an external device, such as a motor 39, while axial coil 12 is excited. The field coil(s) (not activated) will generate electricity, serving as a generator output. Further in accordance with the invention, motor 10 can be used as a brake. This is accomplished by running the system as an electrical generator as just described and directing the generator output from the field coils to a resistive load which dissipates the rotational energy of shaft 22 as heat.
  • motor 10 can be reconfigured by simply modifying the excitation pattern to achieve different speeds and functions (motor, brake, etc.). Moreover, the speed and function can be reconfigured during operation. For example, if the motor 10 were used to power an automobile, it could function as a motor while traveling uphill and function as a brake or generator while traveling downhill.
  • Motor 10 operates effectively with a single axial coil 12, it is also within the scope of the invention to construct a second embodiment of a motor using multiple stationary axial coils and possibly multiple rotors.
  • all of the rotors are secured to a common shaft and each rotor has its own rotor poles and field poles for generating magnetic fields which interact to turn the common shaft.
  • Motor 50 the second embodiment of the invention, is illustrated in Figures 3 and 4.
  • the construction and operation of motor 50 are similar to those of the first embodiment, i.e., motor 10.
  • the component reference numbers in Figures 3 and 4 correspond with those of Figures 1 and 2.
  • Like elements are assigned like reference numbers, with suffixes A,B,C and D indicating four horizontal quadrants, and suffix E indicating upper half and suffix F indicating lower half .
  • Motor 50 has two rotor poles 16B and 16D which are now connected to a second isolated rotor magnetic circuit axial section 14E positioned above the first rotor magnetic circuit axial section 14F.
  • the second rotor magnetic circuit with axial section 14E has its own field coil 12E so that the magnetic field applied to the upper rotor magnetic circuit axial section 14E and its rotor poles 16B and 16D (see Figure 4) can be different than that applied to the lower rotor magnetic circuit axial section 14F and its rotor poles 16A and 16C.
  • motor 50 has two stationary axial coils 12E,12F positioned around rotor axial sections 14E,14F, respectively.
  • Rotor axial sections 14E,14F are both securely mounted to shaft 22 with shielding sleeve 15 of a nonmagnetic material in between.
  • Rotor axial section 14E has two rotor poles 16B and 16D
  • rotor section 14F has two rotor poles 16A and 16C.
  • Motor 50 also has four field coils 18A, 18B, 18C, 18D (18A-18D) mounted about four field poles 20A, 20B, 20C, 20D (20A-20D) .
  • Motor 50 does not use brushes and is free of magnets, although magnets can be incorporated if they confer an advantage in a particular application.
  • Coils 12E,12F can be constructed of wire wound around a bobbin, and can be connected to control system 38.
  • the central concept of motor 50 is the use of two magnetic fields generated by axial coils 12E and 12F disposed coaxially about shaft 22. Each of these two magnetic fields interacts with the magnetic fields in field poles 20A-20C, 20B-20D, respectively, which do not necessarily interact strongly with each other.
  • the magnetic fields in field poles 20A-20D can be generated by various means, such as by field coils 18A-18D and/or permanent magnets (not shown) .
  • Shaft 22 is preferably made of non-f rromagnetic material. Its opposite ends 30E,30F are supported by bearings 58E,58F comprising inner bearings races
  • bearings 58E and 58F are preferably made of ferromagnetic material.
  • Shaft 22 is at the center of field poles 20A-20D and aligned perpendicular to the plane containing field poles
  • Sleeve 15 decouples the magnetic fields of the two rotor axial sections 14E, 14F by providing additional magnetic circuit gap length and increasing the reluctance between the two rotor axial sections.
  • Motor 50 has a cup-shaped ferromagnetic yokes 27E, 27F from which four stationary field poles 20A- 20D extend inward towards shaft 22.
  • a field coil 18A-18D Around each field pole 20A-20D is wound a field coil 18A-18D, respectively.
  • Each field coil 18A-18D is powered by a control system 38 with individual coil outputs numbered to match the associated motor coils.
  • Control system 38 may be controlled by means such as a microprocessor.
  • Each of the magnetically separated rotor magnetic circuit axial sections 14E,14F comprises two substantially cup-shaped or "L"-shaped ferromagnetic structures securely mounted on shaft 22 between bearings 58E and 58F.
  • One leg of the "L" shape extends vertically along the length of shaft 22.
  • the other leg extends radially outward and is connected to rotor poles 16A-16D, which typically have curved faces and face the field poles 20A-20D, respectively (see Figure 4) . While four rotor poles 16A-16D are illustrated, it is within the terms of the invention to use any number desired.
  • the magnetic circuits with axial sections 14E and 14F have a rotor support 29, which is material that fills the space around and between the vertical legs of the "L" shaped structures. It is preferably made of non-conductive, nonferromagnetic material such as plastic to eliminate eddy current losses and minimize inertia.
  • a dual-closed-loop magnetic circuit passes through axial coil 12E, rotor axial section 14E, rotor poles 16B and 16D, field poles 20B,20D, yoke 24E, and bearing 58E.
  • Another dual- closed-loop magnetic circuit passes through axial coil 12F, rotor axial section 14F, rotor poles 16A and 16C, field poles 20A and 20C, yoke 24F, and bearing 58F.
  • Air gaps 46A-46D between rotor poles 16A-16D and field poles 20A-20D, respectively, is relatively small, typically about .003 inches to about .005 inches, and is the controlling reluctance in the two aforementioned magnetic circuits.
  • a preferred direction of rotation and motor start-up is achieved by varying the arc length of rotor poles 16A-16D relative to the arc length of field poles 20A-20C or by varying the horizontal width of air gaps 46A-46D along their lengths.
  • Two-sided motor 50 can be powered with a variety of possible timing sequence.
  • axial coils 12E and 12F can be connected together in parallel, rendering motor 50 functionally identical to the one-sided motor 10 of the first embodiment. Then, all the timing sequences and explanations mentioned above for the one-sided motor 10 apply equally well for motor 50.
  • two-sided motor 50 having the extra versatility of being able to apply different magnetic fields to different axial poles offers other timing sequence not possible with one-sided motor 10.
  • axial coils 12E and 12F can be activated with DC current in opposite directions from each other, causing rotor axial sections 14E and 14F to be magnetized with opposite polarity. Then, control system 38 would activate field coils 18B and 18D with a square wave (current flowing alternatingly in the forward direction and then the reverse direction) , as described above for motor 10, and activate field coils 18A and 18B with another square wave of inverted polarity (i.e. 180 degrees out of phase) from that of field coils 18B,18D. As with the first embodiment, the magnetic field generated by the field coils 18A-18D should be larger than the flux field generated by the axial coils 12E, 12F to overcome "locked rotor" condition.
  • Motor 50 can provide a very compact and robust system capable of high performance with little vibration, bearing wear or cogging.
  • a minimum practical uniform gap width between the outer faces of the rotor poles 16A-16D and the outer faces of the field poles 20A-20D, respectively, is employed for minimum reluctance and maximum torque and efficiency.
  • two stationary axial coils 12E, 12F are illustrated, it is within the terms of the invention to use any number of stationary axial coils, as needed with multiple rotors on a common shaft.
  • motor 50 offers great flexibility in possible timing sequences of powering the multiple axial coils.
  • the rotation can be made smoother by the ability of stacked rotors to be selectively angularly offset relative to each other to decrease "cogging" .
  • rotor axial sections 14E, 14F are magnetically decoupled through use of sleeve 15 or use of nonferromagnetic material in shaft 22 and the structural material of rotor support 29.
  • Motor 50 would then essentially have a single rotor (like motor 10) with two axial coils 12E-12F that could be powered in unison. Despite having two axial coils, the resulting motor would have the same limitation as motor 10 of not being able to magnetize those rotor poles independently.
  • motor 50 As with the first embodiment, it is also within the terms of the invention to operate motor 50 as an electric generator as described for motor 10.
  • the field coils can be interconnected in any desired pattern and dynamically reconfigure as desired to achieve the desired form of power output .
  • motor 50 As with the first embodiment, it is also within the terms of the invention to operate motor 50 as an electric brake as described for motor 10. More or Less Field Poles than Rotor Poles
  • Motor 50 has the same number of field poles as rotor poles. However, as with motor 10, it is also within the terms of the invention to provide more or less field poles than rotor poles. In the case of more field poles than rotor poles, the extra field pole(s) can serve as a tachometer pick-off when not used in rotor driving for speed regulation or stepper control. It is also within the scope of the invention to use any momentarily unused field pole as a tachometer pick-off for speed regulation or stepper control . Stacked Rotors
  • the stacking of stationary axial coils and rotors around a shared shaft can continue resulting in a small diameter motor of superior performance.
  • the performance is enhanced by the ability of stacked rotors to be selectively angularly offset from each other.
  • Stacked motors Similarly, several one-sided motors 10 or two- sided motors 50 can be stacked by sharing a common shaft that runs through them. This offers greater torque, and shaft rotation is smoothed (i.e. less "cogging") by having the motors slightly angularly displaced one from the other.
  • rotor 14 of motor 10 is shaped somewhat like a cylinder with the rotor poles being petal shaped and forming the radial extending lobes 15A-15D, and the axial poles of motor 10 being block- shaped protrusions from the yoke, it is within the scope of the present invention to vary the shapes of the rotor, rotor poles and field poles, as long as they form appropriate closed loop paths for the magnetic field circuit (s) .
  • motor 60 An example of other rotor and field pole shapes is illustrated by motor 60 in Figures 5 and 6. Besides illustrating other pole shapes, motor 60 illustrates a motor having a different number of rotor poles than field poles, in this case 2 rotor poles and 3 field poles.
  • motor 60 The construction and operation of motor 60 are similar to those of the first embodiment.
  • the component reference numbers in Figures 5 and 6 correspond to those of Figures 1 and 2.
  • Like components in motor 60 are assigned like reference numbers, with suffixes A,B, and C indicating 3 horizontal sectors, and suffix E indicating upper half and suffix F indicating lower half.
  • motor 60 is the same as motor 10, except that there are two (2) rotor poles 16A,16B, and three (3) field poles 20A,20B,20C (20A-20C) that are shaped like a sideways "U” , and the three (3) field coils 18A,18B,18C (18A-18C) that are positioned around the vertical leg of field poles 20A-20C instead of the horizontal leg.
  • Motor 60 operates essentially like motor 10.
  • Current flowing through axial coil 12 produces a magnetic field in the two rotor poles 16A, 16B.
  • Current flowing through any of the three field coils 18A-18C produces a magnetic field in the corresponding field pole 20A-20C.
  • Rotor poles 16A,16B are attracted to their adjacent field pole
  • Axial coil 12 is powered continuously with DC current.
  • the three field coils 18A-18C are all activated by a square wave alternating between forward current and reverse current.
  • the three square waves powering the three field coils are identical but offset from each other by 120 degrees.
  • Each field pole attracts the nearest rotor pole when the electric current flows in one direction and repels the nearest rotor pole when the electric current flows in the opposite direction.
  • rotor 14 If timed correctly, rotor 14 continually rotates in one direction, one turn for every two complete square wave cycles.
  • Motor 60 can function as an electric generator or electric brake, in the same way as described above for motor 10.
  • FIGS 7A and 7B there is illustrated an alternative embodiment of motor 50 shown in Figures 3 and 4 which is essentially identical to motor 50 but which incorporates a preferred rotor construction.
  • the six rotor poles 16A-16F are arranged so that diametrically opposed poles, i.e. 16A, 16D, are associated with separate, isolated magnetic circuits. Therefore opposing field poles do not form a magnetic circuit spanning the rotor and inviting lock-up (cogging) .
  • the magnetic circuits of the upper and lower rotor flux paths are isolated by the large, high reluctance gaps provided by the shaft sleeve 15 and non-magnetic rotor structural material between the
  • the upper and lower return yokes 24E, 24F are formed of two 'three blade' ferromagnetic baskets joined structurally by nonmagnetic elements and isolated from each other. If desired, the rotor lobes can be isolated at the hub to prevent cross or transverse rotor flux paths for any axial coil configuration.
  • a motor or electric generator incorporates one or more common stationary axial coils for generating a magnetic field in rotating rotor poles and a separate structure for generating magnetic fields in field poles to magnetically interact with the rotor poles. While the invention has been described in combination with embodiments thereof, it is evident that many alternatives, modifications, and variations will be apparent to those skilled in the art in light of the foregoing teachings. Accordingly, the invention is intended to embrace all such alternatives, modi ications and variations as fall within the spirit and scope of the appended claims.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Synchronous Machinery (AREA)

Abstract

Moteur ou générateur électrique (10) contenant une ou plusieurs bobines axiales fixes (12) servant à générer des champs magnétiques au niveau des pôles d'un ou plusieurs rotors (14), qui interagissent avec au moins deux pièces polaires (20A-20D) et les champs magnétiques, produits par des bobinages inducteurs (18A-18D), qui leur sont associés.
PCT/US1996/010912 1995-06-26 1996-06-26 Moteur a champ magnetique axial, equipe d'une bobine fixe autour d'un rotor central Ceased WO1997001882A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU63410/96A AU6341096A (en) 1995-06-26 1996-06-26 Axial field motor with stationary coil about a central rotor

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US49511695A 1995-06-26 1995-06-26
US08/495,116 1995-06-26

Publications (1)

Publication Number Publication Date
WO1997001882A1 true WO1997001882A1 (fr) 1997-01-16

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Application Number Title Priority Date Filing Date
PCT/US1996/010912 Ceased WO1997001882A1 (fr) 1995-06-26 1996-06-26 Moteur a champ magnetique axial, equipe d'une bobine fixe autour d'un rotor central

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AU (1) AU6341096A (fr)
WO (1) WO1997001882A1 (fr)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999027634A1 (fr) * 1997-11-25 1999-06-03 Carlos Alberto Chichoni Turbine de compression magnetique
DE102004030460B3 (de) * 2004-06-24 2005-06-30 Hans Hermann Rottmerhusen Elektromotorischer Antrieb für ein Fahrzeug
US7755243B2 (en) 2006-08-08 2010-07-13 Toyota Jidosha Kabushiki Kaisha Rotating electric machine
GB2477547A (en) * 2010-02-05 2011-08-10 Graham Michael North Brushless inductor motor
US20140339941A1 (en) * 2011-12-12 2014-11-20 Siemens Aktiengesellschaft Magnetic radial bearing having single sheets in the tangential direction
DE102015002392A1 (de) * 2015-02-20 2016-08-25 Talip Tevkür Elektrische Maschine
WO2016165759A1 (fr) * 2015-04-15 2016-10-20 Abb Technology Ag Machine électrique tournante
DE202016006158U1 (de) 2016-09-27 2016-12-09 Talip Tevkür Elektrische Maschine
DE102016011886A1 (de) 2016-09-27 2018-03-29 Talip Tevkür Elektrische Maschine
DE202018001139U1 (de) 2018-03-05 2018-06-06 Talip Tevkür Elektrische Universal Kraftmaschine
DE102017011018A1 (de) 2017-11-23 2019-05-23 Talip Tevkür Elektrische Maschine
GB2620545A (en) * 2022-05-24 2024-01-17 Michael North Graham Brushless motor without permanent magnets

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US3629627A (en) * 1970-07-06 1971-12-21 Gen Motors Corp Cooling arrangement for a dynamoelectric machine
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US3736449A (en) * 1968-02-21 1973-05-29 Bendix Corp Electrical apparatus
US3931535A (en) * 1973-09-24 1976-01-06 Roesel Jr John F Constant frequency motor generator set with only one rotor
US4647806A (en) * 1985-06-10 1987-03-03 Giovanni Giuffrida Brushless alternator
US4782257A (en) * 1984-10-22 1988-11-01 Electromecanismes R.F.B., Societe Anonyme Dual rotor magnet machine
US4918343A (en) * 1988-10-13 1990-04-17 Kohler Co. Brushless alternator

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US3736449A (en) * 1968-02-21 1973-05-29 Bendix Corp Electrical apparatus
US3590262A (en) * 1968-05-01 1971-06-29 Plessey Co Ltd Brush-operating gear for electrical machines
US3648085A (en) * 1970-03-26 1972-03-07 Lear Siegler Inc Liquid cooling arrangement for dynamoelectric machine
US3629627A (en) * 1970-07-06 1971-12-21 Gen Motors Corp Cooling arrangement for a dynamoelectric machine
US3931535A (en) * 1973-09-24 1976-01-06 Roesel Jr John F Constant frequency motor generator set with only one rotor
US4782257A (en) * 1984-10-22 1988-11-01 Electromecanismes R.F.B., Societe Anonyme Dual rotor magnet machine
US4647806A (en) * 1985-06-10 1987-03-03 Giovanni Giuffrida Brushless alternator
US4918343A (en) * 1988-10-13 1990-04-17 Kohler Co. Brushless alternator

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999027634A1 (fr) * 1997-11-25 1999-06-03 Carlos Alberto Chichoni Turbine de compression magnetique
DE102004030460B3 (de) * 2004-06-24 2005-06-30 Hans Hermann Rottmerhusen Elektromotorischer Antrieb für ein Fahrzeug
US7755243B2 (en) 2006-08-08 2010-07-13 Toyota Jidosha Kabushiki Kaisha Rotating electric machine
DE102007000429B4 (de) * 2006-08-08 2013-04-18 Nagoya Institute Of Technology Rotierende elektrische Maschine
GB2477547A (en) * 2010-02-05 2011-08-10 Graham Michael North Brushless inductor motor
US9568046B2 (en) * 2011-12-12 2017-02-14 Siemens Aktiengesellschaft Magnetic radial bearing having single sheets in the tangential direction
US20140339941A1 (en) * 2011-12-12 2014-11-20 Siemens Aktiengesellschaft Magnetic radial bearing having single sheets in the tangential direction
DE102015002392A1 (de) * 2015-02-20 2016-08-25 Talip Tevkür Elektrische Maschine
WO2016165759A1 (fr) * 2015-04-15 2016-10-20 Abb Technology Ag Machine électrique tournante
DE202016006158U1 (de) 2016-09-27 2016-12-09 Talip Tevkür Elektrische Maschine
DE102016011886A1 (de) 2016-09-27 2018-03-29 Talip Tevkür Elektrische Maschine
DE102016011886B4 (de) 2016-09-27 2018-06-21 Talip Tevkür Elektrische Maschine
DE102017011018A1 (de) 2017-11-23 2019-05-23 Talip Tevkür Elektrische Maschine
DE202018001139U1 (de) 2018-03-05 2018-06-06 Talip Tevkür Elektrische Universal Kraftmaschine
GB2620545A (en) * 2022-05-24 2024-01-17 Michael North Graham Brushless motor without permanent magnets

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