SU1656654A1 - Electric drive - Google Patents

Abstract

This invention relates to electrical engineering and can be used in direct current drives. The aim of the invention is to improve the quality of regulation. The drive contains a digital task block 1, a key management device 2, a pulse converter 3, the inputs of which are connected to the corresponding outputs of the key management device 2, a current sensor 4 connected to one of the outputs of the pulse converter 3. The electric drive provides control of keys 27, 28, 29, 30 depending on the current value measured by the analog-digital converter 6. 5 Il.

Description

yo

ABOUT

ate cx

9s

J

FIG. 2

The invention relates to electrical and hygiene and can be used in direct current drives.

The aim of the invention is to improve the quality of regulation. In FIG. I npnpf, a diagram of a digital current control system of an electric motor is shown, in FIG. 2 a diagram of a current regulator of current in FIG. 4 is a diagram of the programmable timer in FIG. 5 — timing diagrams for an operation of a digital motor current control system;

The electric drive contains a digital task unit 1, a key device 2, a pulse converter 3 whose inputs are connected to the corresponding outputs of the control unit 2 of a current sensor 4 connected to one of the outputs of the pulse converter 3 an electric motor 5 connected one by input to the output 4 of the current sensor and the other to the second output of the pulse generator, analogue digital converter 6, the input of which is connected to the information output of the current sensor 4 In addition, the electric drive contains relays th current regulator 7, the first input of which is connected to the first output of the digital backside unit 1, the second input is connected to the start of the go-digital converter 6, and the first and

SECOND OUTPUTS ARE CONNECTED ACCORDING TO TZO NA

to the first and second inputs of the device 5 gotsz 7 key management programmable timer 8, the first input is no, to the third output of the relay pei / nqroird

CURRENT, SECOND INPUT CONNECTED TO SECOND 9e)

the block 1 digital task a v. / id is connected to the third input of devices 2 key management, the generator E clock pulse, the output of which is connected to the rp -, - input of the relay controller 7 tpkch v programmable timer 8 and the fourth input of the device 2 key management

The relay current regulator 7 (GM fcgL contains an adder 10, the first input of which is the first input and the second input the second input of the relay regulator 7 current programmable logic mafia 11, the first input of which is connected to the output of the adder 10 and the second input "The third input of the relay current regulator 7, the first trigger 12, the counting input of which is connected to the first output of the programmable logic matrix 11 and the output under the keys to the third input of the programmable logic matrix 1t and is the first output of the relay regulator 7 t0kz n Socket trigger 13, the counting input of which is connected to the second output of the programmable

one

s (h I l and 1 g) 1 I and the output is connected i j fiot-ty to the course of the logical logic i: (i iML1 1} and ngpeps second output JOM, MI of j pen i nor, -, gok element

 ° GL 1 I It i (pm v g, c khoi-n-ri, lk iem i ruo z the first h) see the matrix 1 i output h-t; h the third output of the green pei y ;; gtrsp) "eye Prgrammiru

1 t io i logic magr and r-achizuet following

J.IM6 LOGICH SKYA FUGK 4II

llj v t ZxlZx2ZnWif t Zx ZX2ZnWiT,

f-) dg - ZxiZX2r, WiWoT 4 ZxiZnWiW2l. /, t Zx, / x / ZnWiW2T C xiZ z / nWiWjT l / xi IxiZnV W2f where t 1) 7xi i logical CHI is the key of the square, the second is perekleklyu

(oi IR relay relay. cipJiQiCb.

14j /; (/ „, J, / liX. Z3Z2Zil4 iu Zi 1 r, Z; 7iJ, i 7jZ2ZiS) -it / / ri Zii4J / ii4 (TKvЈ signal, op-V.. I / J Jpo. Yor 1 tc relay f j TOKJ street

Zi, i, Z, Zi noi signals

(uu BPindyrii v-ix times chtod.1 ode OILiBki current Z K and I og (s) i pi PM / n logical% ka lth g, m dt ktzs errors l Zn i /), I u Zi .m- „I g si, bore discharge -,; ULJ /.i | yk r

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g (I HOC i x i jiL, M4 С 1 1НСЗЛ (Л О ЦИф

1 jji1 Og JI

ksche Hi hv t 3 ey, and us

Ј (1f ji, or d nepe g h “1pch regainy f / 9, m13 or d g l and

G ZR ZMI LINE (GM

i p; i ig - norpd ir i. my logical one with TIP and 1 is the second third and i h ,. m, v KOTONJH VARIABLE giggvet-gg, t (h with s tJ4b M ret to them and couples fri v ai GTGEI1LChG / ipaBneiun f ti i l rc-v i with fip | i in 1 7 ter 1 1 8 i-rp t s 1 I 0, ir t s 2 0 t iitep s

 v. u H f 1 Of G T j | i i JO / I HY1 Ј COOT

AT i h 1, to the third by third / JP i –nift nr iy and the fifth step of the pyeMot / paternal matrix program 15 outputs of the first 16 and third 17 and 18

Rpf.Torr, 19 Tpi, irrccnp are connected respectively to r i-, to the pin n P (that seventh entry and M pppgramming logic is uji i pgrc 1S and is the first tIR system and

B j-fsys d control keys with output n i TGI n grt, e P 70 -doc for nine virgin noglo-, pg goamggg, j cfion lo (ichic mafnpn 1e. Kotrnch EN, yuan

About 1FOGI f / NKTS1I

P

 1 WjW2 ViV2V3VsT + + WlW2W3 / lV2V3V4T + + WlW2W3VV2V3V4V5T +

+ WiW2W3Vl / 2V3V4V5T +

+ W i W2 W3 V1V2V3V4WT +

+ WlW2W3VlV2V3V4f (6) 2 WiW2W3tf iV2V3V4 / 5T + + W1W2W3VjV2V3V4V5T + + WiW2W3ViV2V3V4V 5T + W i W2 WpVj V3VJT + + WlW333V4V 5T + W i W2 WpVj V3VJT + + WlW333V4V 5T + W i W2 WpVj V3VJT + + WlW333V4V 5T + W i W2 WpVj V3VJT + + WlW2334V 5V + W i W2 W3 V4 V 5

+ WiW2W3ViV2V4V5T (7)

V3 WlW2W3VlV2V3V4 / 57V + WlW2W3 / lV2V3V4V5T + + WlW2W3VlV2V3 4V5 P- + WiW2W3ViV2V3VdT + + WlW2W3 / lV2 / 3V4T 4

VWiW2W3ViV3V4VsT (8)

4 WlW2W3VlV2 / 3V4V5T + -t- WlW2W3VlV2V3 / 4V5T + + WlW2W3VlV2 / 3V4T - + WiW2W3 / 2V3 / 4V5T + + WlW2W3VlV2V3V4 / 5T + WiW2W3VjV2V3V4T (9) WiW2W3V V2V3V4V5T4- + A / 1 A / 2 A / positions M1 / 2UzU4U5T + + WlW2W3VlV2V3 / 4V5T +

+ WiW2W3 7lV2V3V4V5T, (to)

where vi v v v. output logic signals of a programmable logic array 15;

Vi, V 2, Va, V4, Vs output logic signals, respectively, of the first 16, second 17, third 18, fourth 19 and fifth of the 20 triggers.

WL L / 2, L / C, T are the input logic signals, respectively, to the first, second tertiary and fourth inputs of the key management device 2.

Programmable timer 8 (see FIG. 4) contains an RS type trigger 21, an IS-NOT element 22, the first input of which is the third input of the programmable timer 8, a second input connected to the output of the 21 trigger trigger element AND 23. The first input of which is connected to the output of the trigger 21 and is the output of the programmable timer 8, the second input is connected to the first input of the trigger 21 and is the first input of the programmable timer 8, the counter 24, the first input of which is connected to the output of the element AND- 22, the second input is the second input of the programmable timer 8, third in the stroke is connected to the output element And 23, and the output is connected to the second input of the trigger 21.

The pulse converter 3 is made according to a bridge reversing scheme and contains keys 25, 26. 27. 28 and reverse diodes 29, 30, 31. 32. the on state of the keys corresponds to the state log. 1 on the input of the pulse converter 3 signals Vi. V2, Vs, V, i, respectively.

The drive in different modes of operation works as follows.

When turning on the power of the current control system of the electric motor, the initial setting of the flip-flops 12, 13 of the relay current regulator 7 and the flip-flops 16. 18, 20, the key management device 2 is in the log.O state, and the trigger 17 and 19 of the key management device 2 state 5 log 1. Thus, in the initial state, by the signals V2 and V4 of the key management device 2, the keys 26 and 28 of the pulse converter 3 will be turned on. As a result, the motor does not receive Uo power supply voltage, and the motor core circuit is closed through the keys 26. 28, diodes 30, 32. 1. The drive start mode at

KVH1 0.

Let at time t0 (see Fig.5)

5 Kos KVH1-1. Wi 0. Wz 0, then in accordance with expressions (3) and (4) Zx i 1, ZX2 1, Zn 0. Hereinafter we will consider the system operation for the logical signal S 0 at the input of the programmable logic

0 matrix 11 relay regulator 7 current. In accordance with expressions (1) and (2), the second output of the programmable logic matrix 11 is a pulse (pr. Which sets the trigger 13 to the state A / 2 1. In

5 at the same time, this pulse is driven at the output of the OR-NOT 14 element and at the third output of the relay current regulator 7, from where it arrives at the first input of the programmable timer 8 and sets trigger 21 into it.

0 state log. 1. At the output of the programmable timer 8, the state W / C 1 is set. And the counter 24 will start counting the time delay. Thus, at the inputs of the control unit 2, keys are installed Wi O, W2 1, L / z 1.

Let at the time instant to be the states of the signals Vi 0, V2 1, Oz O, V4 - 1. Vs O, then in accordance with expressions (6), (7),

0 (8), (9) and (10) at the second output of the programmable logic array 15, the pulse signal fa will be set, which will set the trigger 17 to the V2 - 0 state, which will turn off the key 26 of the pulse generator and keep the zero level voltage at its output. After the timeout has expired, the transfer pulse from the output of counter 24 will be set to the log state. O trigger 21 and exit

the programmable timer 8 is set to L / z 0, then in accordance with the expressions (6), (7) D8X9); (10) a pulse signal p appears on the first output of the programmable logic matrix 15, which sets the trigger 16 to the state Vi 1 The key 25 is turned on, as a result, the motor 5 will receive a positive polarity through the included keys 25, 28 of the pulse converter. The motor current begins to grow in the region of positive values. At time ti, the current reaches a value at which

Z KBX + Koc + 1 -1, i.e. II ... Ill, then we get ZX1 1, ZX2 0, Zn 1. Considering that the triggers 12 and 13 are in the state Wi O, L / 2 1 in accordance with expressions (1), (2), we get the pulse signal p2 at the second output of the programmable logic matrix 11, which sets the trigger 13 in the relay current regulator 7 to the state L / 2 0, and the trigger 21 in the programmable timer 8 to the state log. 1. At the same time, the output of the programmable timer 8 is set to the L / C 1 state and the time delay starts. In the device 2 key management in the states of the input signals Wi O, L / 2 O, L / z 1 and the previously established states of the triggers 16, 17, 18, 19, 20 respectively Vi 1, V2 0. Vs O, V4 1, Vs 0 with the arrival of the next clock pulse T at the fourth output of the programmable logic array 15, the pulse signal t / ij appears, which sets the trigger 19 to the state VA 0. The switch 28 in the pulse converter 3 turns off. As a result, the current begins to decrease, Circuit lock on the circuit: motor 5-diode 31 - key 25 - current sensor 4 - motor 5. After you The time delay in the programmable timer 8 sets the output state L / C 0. As a result, the key management device 2 (for Wt 0, L / 2 O, W3 0, Vi 1: V2 0, Vs O, V4 0, Vs 0), at the third output of the programmable logic matrix 15, the pulse signal TO is shown). which sets trigger 18 to state / g 1. The key 27 is turned on. which will create an additional circuit for closing the engine core circuit. The current continues to subside. Note that in this case, the closed state of the engine core corresponds to the on state of the keys 25, 27 of the pulse converter 3, in contrast to the situation at time T0, when the closed state of the engine core circuit was created by the on state of the keys 26, 28.

0

five

0

five

0

five

0

five

0

five

At time t2, when the current reaches the value at which Z КВХ1 Kos 41 1 (i.e. code 00 ... 001) in accordance with expressions (3) and (4) we get Zxi 1. Zx2 0, Zn 0 Taking into account the previously established states of the triggers 12, 13 Wi O, L / 2 0, with the arrival of the next clock pulse T (here the active signal level is zero), in accordance with expressions (1), (2), we obtain a pulse signal p2 on the second output of the programmable logic matrix 11, which sets the trigger 13 to the state Wa 1, and the trigger 21 in the programmable timer 8 to the state Ws 1 and starts counting no time delay. In the key management device 2 in accordance with the states of the signals Wi - O, L / 2 1: W3 1, Vi 1: V2 - O, V3 1, V4 O, Vs 0 at the third output of the programmable logic matrix 15 by a pulse signal The dose that will set the trigger 18 to state Oz. The key 27 is turned on. The current continues to fall, closing on the circuit: electric motor 5 - diode 31 - key 25 - current sensor 4 - electric motor 5.

When the time delay has expired, a signal condition is established, resulting in the fourth output of the programmable logic array 15, the signal t / u turns on, which sets trigger 19 to state V4 1. The key 28 is turned on and a positive voltage is applied to the motor.

Simultaneously with the signal DO4, the signal DO5 is reached at the fifth output of the programmable logic matrix 15, which sets the trigger 20 to the state Vs 1. Under the action of positive voltage, the motor current will increase and at the time point rz will reach the value at which Z КВх1 + Kos + 1 -1, then ZX1 1, ZX2 - 0, Zn 1. Since Wi 0, L / 2 1, then the signal BEFORE the trigger 13 will be set to the state L / 2 0, and three rep 21 will be set to the state L / C 1. In device 2 key management at Wi 0. L / 2 0, L / r 1, Vi 1, V2 0, Ou O, 1: Vs 1, a pulse signal DO1 is formed, which will set the trigger 16 in the state Vi 0, as well as the pulse signal DOE. which sets the trigger 20 to the Vs 0 state. With the Vi signal the key 25 is turned off and the voltage applied to the motor, the Current begins to fall short on the circuit: electric motor 5 - key 28 - diode 30 - current sensor 4 - electric motor 5. After the exposure time time in the programmable timer 8, the state Wa 0 is set, and in the key management device 2 - signal 2 - the trigger state 17 V2 1

Turns on key 26. The current continues to subside. The core of the electric motor is now closed with keys 26. 28 i.e. just like at time point to. With further current flow up to the value, when Z КВХ1 + - К0с + 1 1. the same switchings will occur as at the moment of time to and further the process of stabilization of the current will be repeated.

Thus, it can be seen that the switching frequency of the pulsed converter keys here is two times less than the frequency of the pulse voltage fed to the motor, and the current pulsation range is limited by the value of the first hysteresis.

2. Braking mode

Let at time t.4 from block 1 of the digital task a new value КВх2 0 was received.

Let also the values of this task and the counter electromotive force are such that the counter electromotive force. which, in the braking mode of the electric drive, coincides in direction with the electric motor current, it is able to create a current in a closed circuit of the electric motor

HIS (/ К0с | / квх2 /). At kWh 0, Kos K „x2 + 1 I

Wi 0, W2 O

In accordance with expressions (3) and (4) (1) and

(2) ZX1 1, 7x2 1 states are established. Zn

 1, the p- and 2 signals will set up the states Wi 1, L / 2 - 1, W3 1, and the time delay will begin. Since up to the time point m in the key management device 2 were Vi O, V2 1, / C O, V4 1, Vs 0, then after switching the relay current regulator 7 in accordance with expressions (6) - (10 ) by signal / i MA 0. will turn off. Key 28 is turned off. The motor current will continue to fall, closing on the circuit: electric motor 5 - diode 31 - + power source - - power source - diode 30 - current sensor 4 - electric motor 5. After the exposure time the time when the state Wa 0 is set, the ifo signal switches the trigger 18 to the state V3 1 and the key 27 is turned on. ate ,, he continues to fall to zero by the above circuit, and then through the enable switch 26, 27 begins to rise in the nega- tsytelnyh values.

At time ts, the current reaches the value at which

Z KeXj + Kos + 1 1, then Zxi 1. ZX2 0, Zn 0. Given the previously established states of the signals Wi 1, W2 1, the signal generated in the relay controller 7 current signal will set the signal L / 2 0, L / s 1. Time delay countdown will begin, and in the key management device 2, when Vi is previously set to O, V2 1. Va 1, V4 O Vs, 0, the signal / 2 will switch the signal state to 0. The key 26 will turn off and negative polarity applied to the electric motor 5. However, due to the same current directivity and counter electromotive force of the electric motor, the current will continue to increase and in absolute value, closed by circuit1 electric motor 5 - current sensor 4 - diode 29 - key 27 electric motor 5. After the time delay expires when the state Ws is established

0 in the key management device 2, the state Vi 1 changes. Key 25 is turned on, but the current will continue to grow along the same circuit. At time t6, when the current reaches the value at which Z KVx2 + Kos

1–2 ZX1 1.2x2 1, Zn 0 states are established. Under Wi 1, L / 2 O states, the signals and (pi change the states Wi O, L / 2 1, Ws H. Time delay countdown will begin In this case, the state of the signal 3 in the key management device 2 is set to 3. The key 27 turns off. The current will begin to decrease in absolute value, closing along the circuit: electric motor 5 - diode 29 - + power source - - power source - diode 32 - electric motor 5.

When the time delay has expired, the states in the programmable timer 8 are set to Wa - 0, in the key management device 2 - V4 1, Vs 1. States Wi O, W2 1, Vi 1. V2 - 0, Va 0 is saved . Switch 28 is turned on, and a positive polarity voltage is applied to the motor. The current will continue to decrease in absolute magnitude, closing on the above circuit.

At time t, the current will reach. WHICH Z is Kvx2 + Kos + 1 -1,

then Zxi 1: Zx2 0, Zn 1. The following changes will occur: W2 0. W3 1, / 4 0, Vs - 0. The states Wi - O, V2 0, Va O, V4 1 are saved. The key 25 will turn off. The current will continue to decrease, closing the circuit.

After the time delay expires, the state W3 0 is set. In the programmable timer 8 and V2 1 in the key management device 2. Switch 26 is turned on, and the motor current begins to grow in absolute value under the action of back-emf, closing along the circuit: motor 5 — current sensor 4 — key 26 — diode 32 — electric motor 5.

At the moment of time te, the current will reach the value at which Z Кйх2 + Kos + 1 1, then Zxi 1. Zx2 0, Zn - 0.

In this case, the following state changes will occur: Wa 1, Wa 1, N / 2 0. The states Wi 0, Vi 0, Va O, V4 1. Vs O are saved. Key 26 is turned off, and the motor current begins to decrease in absolute magnitude, closing on the circuit: electric motor 5 - current sensor 4 - diode 29 - + power source, - + power source - diode 32 - electric motor 5. After the time delay has expired, neither L / z 0, Vi 1. The states Wi O, L / 2 1, V2 0, Ou 0, V4 1, Vs 0 are preserved. The key 25 is turned on. And the current continues to decrease, closing on the previous circuit. At the moment of time tg, the current will reach the value at which Z КВх2 + Kos + 1 -1. Zxi 1, Zx2 0, Zn 1. There will be a change in the states L / 2 0, Wa 1, N / 4 0. The states Wi - 0, Vi - 1, V2 0, Va 0, Vs - 0 are saved. Key 28 is turned off, and the current continues to decrease, closing on the same circuit. After the time delay expires, the following states will be: Wi O, W2 O, L / C 0, Vi 1, V2 O, V3 1, V4 0, Vs 0. Key 27 is turned on, and the current begins to increase in absolute value, short circuit circuit: electric motor 5 - current sensor 4 - diode 29 - key 27 - electric motor 5. Note that in this case, the closed state of the core circuit corresponds to the on state of the keys 25, 27 in contrast to the situation at time t, when the closed state The motor core circuit was created by the on state of the keys 26, 28.

At time tio. when Z КВХ2 + Кос + 1 is 1. Zxi 1, ZX2 0, Zn О, the following states Л / 2 1, Wa 1, Va 0 change, the states Wi O, Vt 1, V2 0, V4 0, are saved V5 0. Key 27 turns off, and the current will begin to decrease in absolute magnitude, short circuit circuit, motor 5 - current sensor 4 - diode 29 - + power source - - power source - diode 32 - electric motor 5. After the time delay has expired, the following Wi O, W2 - 1 states. Wa 0, Vi - 1, V2 O, Va - O, V4 1. Vs 1 and key 28 is turned on, but this does not affect the process of changing the current.

At time tn, when Z КВх2 + Kos + 1 - -1 will be Z, Zx - Zx2 0, Zn 1, the following states W2 O, Wa 1, Vi 0, Vs 0 change, the states Wi - 0 are saved. V2 - 0, Va О, V4 - 1. Turns off the key

25, which does not affect the current change process. After the time delay expires, Wi O, W2 0, Wa 0, Vi O, V2 - 1, Va - 0 states. V4 1, Vs - 0, Turn on the key

26. A circuit is created to close the current under

the action of the motor's back electromotive force in the circuit: electric motor 5 - current sensor 4 - switch 26 - diode 32 - electric motor 5. This state of the system is identical to that after time t.

Thus it is clear that the switching frequency of the keys of the pulse converter

and in the case of regenerative braking, two times less, the frequency of the pulse voltage applied to the motor, and the range of current pulsations is limited by the value of the first hysteresis of the relay current regulator 7.

Further processes will be repeated until then. until, as a result of deceleration, the electric motor's electromotive force does not decrease to such a magnitude that it is not capable of generating a current greater than the set current in the electric motor core, then the system will go into a deceleration mode with current consumption from the power source. In this case, for the above-mentioned last state of the system, the current in the closed circuit through the switch 26 and the diode 32 will not grow but continue to decrease in absolute value and at the time ti2 will reach the value at which

thirty

Zn 1.

Z K in 2 + Kos + 1 -2. Zx1 1, Zx2 1,

As a result, the state of Wi 1, W2 1, Wa 1, V4 O is changed

Vi o, V2 1, Va 0, Vs 0 states. Key 28 is turned off. This will not affect the current change process. After the time delay in the system will be Wi 1, W 2 1, Wa 0, Vi 0, V2 1, Va 1,

V4 0, Vs 0. Key 27 is turned on, and negative voltage is applied to the electric motor via keys 26, 27. The current begins to increase in absolute value under the action of the source voltage

nutrition

At time tia, when Z KBX2 + -t- Roc + 1 1, Zxi 1, ZX2 0, Zn 0 changes states W2 0, Wa 1, V2 0, are saved

states Wi 1, Vi 0, Va 1, V4 O, Vs 0. Key 26 is turned off, and the current starts to decrease in absolute value, closing on the circuit: motor 5 - current sensor 4 - diode 29 - key 27 - motor

5. When the time delay in the system expires, the states Wi 1, W2 0, Wa О, Vi - 1, V2 - 0, Va 1, V4 0, Vs 0, switch 25 will turn on. The current will continue to decrease, short circuit oh circuit up to the moment

time when Z KVx2 4 Kos 1 -1. Considering further the switching process, it can be seen that in this case the switching frequency of the keys is two times lower than the frequency of the voltage i, fed to the 5th motor, and the current ripple range is limited by the value of the first hysteresis.

3. Consider the operation of the drive when setting the zero current (KVhz 0).

Suppose that up to time point 10 tis the system was in the Kos -1 state. Wi 1, L / 2 1, Wa 0. Vi О, V2 - 1, V3 1, V4 0, Vs 1. At the moment of time tis, when the signal Kvhz 0 arrives, it will be Z KVhz + + KQQ + M, Zxi 1, Zx2 - 1, Zn 0. In system 15, the state of Wi 0, Wa 1, L O, Uz - 0 changes, the state L / 2 1, Vi 0, Vi 0, Vs 1 is preserved. The keys 26, 27 turn off. The current will begin to decrease in absolute magnitude, closing on the circuit: electric motor 5 20 - current sensor 4 - diode 29 - power source - power source - diode 32 - electric motor 5. After the time delay in the system, Wi О, Л / 2 1, W3 0, Vi 1, V2 О, V3 О, V4 - 25 1, Vs 1. Keys 25 and 28 turn on. As a result, the current will decrease in absolute value until zero closes along the previous circuit through diodes 29 and 32 and the power source, and then will start to grow in the region of 30 positive values due to the action of the yarn of the positive floor pH spine coming through the keys 25, 28

 At time, the tie current will reach the value at which 35

Z Kwx3 + Kos + 1 -1, ZX1 Zx2 0, Zn 1.

In the system, the state Wa O, L / C 1, Vi 0, Vs - 0 changes, the states Wi - 0, 1 g O, Vs 0, / 4 1 are saved. Turn off key

25. And the current will begin to decrease, closing on circuit 40: electric motor 5 - key 28 - diode 30 current sensor 4 - electric motor 5. After the time delay in the system, Wi O, L / 2 O, W3 0, Vi ABOUT,

V2 1, Va 0, 1, Vs 0. Turns on the key 45

26. The current will continue to drop to zero, closing along the previous circuit, and then will grow in the region of negative values under the action of back emf closed in the circuit: electric motor 5 - current sensor 4 - 50 switch 26-diode 32 - electric motor 5.

At time TU. when the value of Z KVxZ + Kos + 1 1, Zxi 1, ZX2 0, Zn 0 is reached, changes in the state L / 2 1, Wa 1 will occur in the system. V2 O, 55 state Wi 0. Vi 0, Va 0, 1, Vs 0 is saved. The key 26 is turned off. The current will begin to decrease in absolute magnitude, closing on the circuit: electric motor 5 - current sensor 4 diode 29 power source - power source diode 32 electric motor 5. After the time delay in the system, the system will: leave Wi - 0. W2 - 1, Wa 0. Vi - i, V2 - 0. Vj - O, V - 1, V5 - 0. Key 25 is turned on. The current will continue to decrease in absolute value to zero, close to the previous circuit, and then start to grow. in the region of positive values under the action of a positive polarity voltage applied to the electric motor through the keys 25, 28. If we continue further consideration of the process of current regulation, then we can see that here the switching frequency of the keys is two times lower than the frequency of the voltage supplied to the electric motor, moreover, the voltage impulses are unipolar, the current pulsations are symmetrical relative to the current setting, those. linearity of the adjusting characteristic.

If the counter-EMF of an electric motor is small enough and unable to create a current in a closed circuit greater than the first switching threshold of relay current regulator 7, the switching of the keys of the pulse converter at zero current setting is stopped. In particular, in the considered example, after the current reaches the value at which Z kWh + Kos f 1 -1 the last switching of the relay current regulator 7 occurs, the states Wi O, W2 - 0. Wa 0, Vi - 1, V2 O, V3 1. V4 - 0, Vs 0. keys 25 and 27 are turned on. Through these keys and diodes 29, 31, the motor core circuit is closed and the current drops to zero

Claims (1)

An electric drive comprising a digital task block, a key management device, a pulse converter, the inputs of which are connected to the corresponding outputs of the key management device, a current sensor connected to one of the outputs of a pulse converter, a motor circuit with a series-connected current sensor connected to a pulse output converter, analog-to-digital converter, the input of which is connected to the information output of the current sensor, which is similar to that. that, in order to improve the quality of regulation, a relay current controller, a programmable timer, a clock pulse generator, are additionally introduced, the output of the clock generator is connected to the input of the key control device, the inputs of the relay current regulator and the programmable timer, and the first and second sawn torus current is connected respectively to the first output of the digital reference unit and to the output of the analog-digital converter; the second output of the digital reference unit is connected to the second input p ogrammiruemogo timer whose output is connected to the third input key management device, the first and second inputs of which are connected to the first and second outputs of the relay current controller, the third output of which is connected to the first input of the programmable timer. Rig.Z i / I I  ji i i i, 1PPO ML JJLTLIlhjtlJQuJl-LSPSh JULjLfL | liO i i Г T i i i i i i I t JLUT U - 4-4- Li44bUUUl-4 I1 I til J, 4- +} f if i p l-La-Ш I I I I I I . juJnfiat bh i i -i i i n II I I III p p up to p p i gt gt i I m I I Mill 1 P P I I I I I I P p p p p p r p I FN4-1 I i i i i I I I I I I Ij P t -J-, TP 10 I I R 1 If Jl p flI I II I in i i In III II I I 1P li 1P iri H And    iL III I I I I L, | P L tfs f tff I t II  I 11 NTP PG I I  f a-Ш I . i i -i i i m juJnfiat bh i П П and П П П I Mill L P P I I I I I I I I I I I I I I I nir i li And II P flP PD PP I I I I t t in P1 p flI I p i i g I I II I II TGPi IU ILJ in in ir I I I I I f