SU1348969A1 - Electric drive - Google Patents

Abstract

The invention relates to electrical engineering and can be used in drives of various mechanisms. The purpose of the invention is to increase the reliability of the drive in operation. This goal is achieved by initially connecting the two phases of the asynchronous motor at the time of maximum of the corresponding interfacial voltage to the phases of the power source and then connecting the third phase of the asynchronous motor to the third phase of the power source at the time of maximum of the corresponding phase voltage. 2 itn. 00 1 00 with O5 with

Description

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The invention relates to electrical engineering and can be used in drives of various mechanisms.

The purpose of the invention is to increase the drive reliability in operation by reducing the impact moments at start-up.

FIG. 1 is a circuit diagram of the proposed electric drive; in fig. 2 - graphs of voltages and currents that work on the operation of the device.

The electric drive contains a three-phase asynchronous motor 1, the first phase of the stator winding is provided with a clamp 3 for connecting to the first phase of the power supply through the first triac 2, the second phase of the stator winding is provided with a clamp 4 for connecting to the second phase of the power source, the third phase of the stator winding of the asynchronous electric motor is provided with a clamp 6 for connecting to the third phase of the power source through the second triac 5, two optocouplers 7 and 8, two full-wave rectifier bridges 9 and 10, the AC terminals each of which is connected between the anode and the control electrode of the first and second triacs, respectively, the DC outputs of the first full-wave rectifier bridge 9 are bridged in series with the first resistor 11 and the photothyristor of the first optocoupler 7, the DC outputs of the second two-pole rectifier bridge shunted in series by the second resistor 12 and the photothyristor of the second optocoupler 8, the third full-wave rectifier bridge 13, one output I close its contact 14 of the Start button is connected to the clamp 6 for connecting the power supply to the third phase, another output of the closing contact 14 of the Start button is connected to the anode of the third optocoupler 15 LED and the cathode of the fourth optocoupler 16 LED, the fourth anode of the fourth optocoupler 16 through the fourth resistor 17 is connected to the anode of the first triac 2, the cathode of the LED of the third optocoupler 15 through the fifth resistor 18 is connected to the second phase of the stator winding of the asynchronous motor 1, the findings of the direct current of the first full-wave rectifies lnot of the bridge 9 zashuntiro489692

baths connected in series by the sixth resistor 19 and photothyristors of the fourth and third optocouplers

J 16 and 15, respectively, the cathode of the first triac 2 is connected to the cathode of the LED of the fifth optocoupler 20, the anode of the LED of the fifth optocoupler 20 through the seventh resistor 21 is connected to the second phase of the stator winding of the asynchronous electric motor, the DC output of the second full-wave rectifier bridge 10 shunted in series by the 15th eighth resistor 22 and photothyristor of the fifth optocoupler 20, the cathode of the LED of the second optocoupler 8 is connected to the anode terminal of the third through the opening contacts 23 of the Stop button

20 of a full-wave rectifying bridge 13, the cathode output of which is connected through a series-connected third resistor 24 and a LED of the first optocoupler / with the anode of the diode of the second optocoupler 8.

The device works as follows.

Let the A, B, C phases of the melting network be connected to terminals 3, 4 and 6, respectively. At short-term contact contact 14 of the Start button on the LEDs of the optocouplers 16 and 15, the corresponding line voltage of the power supply network (Fig. 2a) is supplied - the diode 16 is supplied to the light of the optocoupler 16, and the line voltage U is applied to the LED of the optocoupler 15 - linear voltage U the networks and through the LEDs of these optocouplers flow currents, respectively, i (fig. 2 b) and i (fig. 2 c). With the simultaneous inclusion of the photothyristors of optocouplers 16 and

15 flows the control current through the circuit: triac input 2 - lower (according to the circuit)

45 shoulders channel rectifier 9 - resistor 19 - photoresistors of optocouplers

16 and 15 are the upper (according to the diagram) shoulders of the channel rectifier - the control electrode of the triac 2. Triac 2 50 is turned on at the moment when the voltage Ug takes a value close to the maximum (interval t, -t in Fig. 2). As a result, the voltage Ug is applied to the first and second phases of the induction motor 55 of the motor 1, causing current i to flow (Fig. 2g) through the LED of the optocoupler 20 at the time this voltage passes from the region of positive to negative values, which corresponds to ms - the voltage of the phase voltage U is exceeded, through the maximum value (time t in Fig. 2 g; Turning on the photo thyristor of the opto 20 causes a corresponding triac 5. In the pe.yHbTaTii: third phase of the asynchronous ele;; -: trod ;, the igatvl is supplied to the phase voltage . i b. and straightened teln;, l bridge 13 oklz: aiae rc vkg g1yuchennym on l meychoe .sh.tr

and

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mains voltage -j; "through the LED to a i j, (fig 2 e) and 8 I turn on 5 5 2 and 5 in the open

 off | - che1 ich m (1r-gu -; ki KpaTK-.jBpcM liHO press 1 kii: (23). As a result, the iGI optoopop LEDs 7 and 8.

YUTSYA F OTOTYPHIST O of these -;:;

which leads to powering up with 2 and 5,

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pern I fa- (; atorchy poi about snas :( ;; and kitsch;); -; scientific research institute to neLiBOii phase. not through nepti iii r C; I - ;; K; T; I: .. 1 I o, , 1a fa. And stator coil. Clamp DP-: connect to T; TO1; 15Y f :):. Power supply, ipei, H fa, 1 stator of asynchronous epektro dv1-tel is equipped with a long clamp ;; connection to the third phase of the imp: t (power supply through the second triac, the bottom of the optocoupler, three resistors, two two-half-rectifying bridges, the AC output terminals of which are connected between the anode and the control electrode of each of the triacs, respectively , DC outputs of the first two-half-period rectifying bridge for

the second one, the closing contact KHoiTKri Pusk, one output of the third 1-stor 11od; connected to the anode of the luminous emitter of the first optocoupler, the cathode of which is connected to the anode of the second UOI of the optocoupler, which differs on: dezh1: spines due to the reduction of shock moments at start-up, resistors iih are inserted into it, the third, fourth, bill are intrinsic, the break contact mc. Stop, third dual-BLITr of the goal; - Bridge, one of the :: :: closing of the closing button of the Start button is connected to the hem to connect to the third phase of the source; i: ra fi n, the other Withdrawal of the closing contact: of the knggka The start is connected to L1K D H SB of the diode of the third optocoupler 1 with the cathode of the fourth LED

vJi) OH, LED anode of the fourth C lrpo a through the fourth resistor G1g; d1,; 1; u cn to the anode of the first triac,: atom cg Ptood of the third optocoupler 41 4; 3 11th pesPiCTop connected to I 1,); - P11 phase the stator winding of an asynchronous electric motor, the terminals for .k; tg HHij.f / for the current of the first two-half- / lO M ci o vb,; 1p iktel1. th bridge; v H;: the fuses are subsequently nat 5 sii-is the sixth resistor and phototype 1, h: by the fourth and third oprogators cc) 0 j, respectively, the cathode of the first si: source.d is connected to the light cathode jji { ci:, -, p of the optocoupler, LED anode; c. 1 of that optocoupler through the seventh emergency relay; one with the second phase of the stationary winding of the asynchronous electric motor; a constant current output HTopoi o of the full-wave telescope bridge is bridged by series-connected eighth resistor and phototristor Togo

g optocoupler, the cathode of the LED of the second optocoupler through the opening contacts of the button Stop is connected to the anode terminal of the third full-wave rectifying bridge, the cathode pin

shunted in series, the water of which is connected to another output of the first resistor and phototirid of the third resistor;

the alternating current of the third full-wave rectifying bridge connected respectively to the second and third phases of the stator winding

the torus of the first optocoupler, the DC outputs of the second full-wave rectifier bridge are shunted by the second resistor and the photo thyristor in series

55

asynchronous electric motor.

the alternating current of the third two-period rectifying bridge is connected respectively to the second third phases of the stator winding

55

asynchronous electric motor.

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Compiled by S.Graponov Editor T.Parfenova Tehred I.Popovich Proofreader I.Musk

Order 5197/55 Circulation 658 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

Claims (1)

Ele G Troprinsd _; 'L.;.'. L! ¹ ! ' : th Dych · phase ace / ttd ly to-tootr. d x - ¹ a '· ·: h. the first fa-'s with -'-atoric exchange; ·· which From us: same: N '/ ll-unit .; ty'ya L / l — if — to the pee phase ν ' ^τ -' 4 < ^:, ι supply: through the first sychistor, the zipaya falator stator winding is equipped with a clamp for connecting to the second fan of the power source, the third phase of the stator winding of the induction motor equipped with a clamp for connecting to the third phase of the power source through the second triac, two optocouplers, three resistors, two two-half-wave rectifier bridges, the alternating current leads of each of which are connected between the anode and the control electrode of each of the triacs, respectively, the findings are constant the current of the first half-wave rectifier bridge is shunted by a series-connected first resistor and a photothyristor of the first optocoupler, the DC outputs of the second half-wave rectifier bridge are shunted by a series-connected second resistor and a photothyristor of the second optocoupler, the closing contact of the Start button, one terminal of the third posistor is connected to the anode of the LED which is connected to the anode of the LED of the second io optocoupler, characterized in that, in order to increase reliability due to reduction of shock moments at start-up; in resistors, third, fourth,: | t'yy optocouplers, NC contact stop 'Stop, third two-half! n> DNN ··. rectifier bridge, one run-out of the closing con-akga of the Start button ^{1, is} connected to the clamp for connecting to the third phase of the source of gassing, the other output of the closing ·: Ή ·. This Start button is connected to the LED of the third optocoupler and the cathode of the LED of the fourth drone, the anode of the LED of the fourth drone is connected through the fourth resistor to the anode of the first triac, the cathode of the LED of the third optocoupler mi is 4-: 3 the fifth resistor is connected to the smooth phase of the stator winding of the induction motor, terminals for current lsstg HHij fy first dvuhpolu1 ^{'g -lo::} ιό second rectifier bridge za- / in; propanes sequentially soedich "1 · yyi sixth resistor and fototi; .ή ·:. tori fourth and third optocouplers, respectively, to the cathode of the first signal is connected to the cathode of the light path, the fifth optocoupler, the anode of the LED; <·. the fifth optocoupler through the seventh resaslor is connected to the second phase of the stator winding of the induction motor, the DC output of the second half-wave rectifier bridge is shunted by the eighth resistor and the fifth optocoupler of the fifth optocoupler, the cathode of the LED of the second optocoupler through the disconnecting contacts of the button is connected to the second bridge the cathode terminal of which is connected to the other terminal of the third resistor, the alternating current terminals are one third of the full-wave rectifier bridge are respectively connected to the second and third phases of the stator winding of the induction motor.