SU1430304A1 - Vehicle electric drive - Google Patents

Abstract

The invention relates to motorized vehicles and provides improved accuracy and a wider range of control. The vehicle's electric drive is connected to the power source 1 through the inlet filter 2, a group of traction motors 5 with excitation windings 6, the thyristor interrupters 7 and 9, consisting of thyristors 15-18, connected in a bridge circuit are included in the motor power supply circuit . the diagonal of which includes a recharging sensor 19, commuting choke 21 and a capacitor 20. The device consists of a current control channel 26 and a voltage control channel 27 equipped with comparison blocks 28, phase shifting blocks 29, inversion

Description

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tori 30, intermediate distribution units 31, pulse generation and distribution units 32, comparators 33 and pulse expansion units 34. The signals from the control panel 42, acting on a switch of 10 modes, cause the starting contacts 11,12 RSII 13, 14 to close, depending on the mode of operation of the vehicle.

arrive at the inputs of the block 32 for shaping and distributing the pulses of the control channels 26 and 27, allowing the passage of control pulses to the thyristors of the interrupters 7 in the starting mode and interrupters 9 in the braking mode, and to the input of the current setting unit 35, fixed at its output set level of current setting. 2 з.п, ф-л, 3 Il.

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The invention relates to electrical equipment of vehicles, namely to direct current DC electric drives with thyristor-impulse: ll control.

The purpose of the invention is to increase the TBcn: and expanding the range of regulation,

FIG. 1 shows a functional block diagram of a vehicle electric drive; in fig. 2 connection diagram of the current sensor of a group of traction electric motors; in fig. 3 is a block diagram of an intermediate distribution unit and mylocs.

The vehicle's electric drive contains connected to the power source 1 through the inlet filter 2, consisting of throttles 3 and a capacitor 4, a ground motor of the traction motors 5 with excitation windings 6, the first chopper 7, the braking resistor 8 connected in series and the second chopper 9, the switch . 10 modes with starting contacts 11 and 12 and brake contacts 13 and 14. Each chopper consists of thyristors 15-18, connected via a bridge circuit, the diagonal of which includes a recharge sensor 19, a neutral capacitor 20, a speed limiter 21 increasing current through the thyristors of the interrupters. To the diagonal / bridge circuit terminals, one of its electrodes is connected to reverse diodes 22 and 23, the other electrodes of which, through chokes 24 and 25, are connected to one of the plates of the capacitor 4. The device contains current control channels 26 and 27, each of which contains

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comparator unit 28, the output of which is connected to one of the inputs of the phase-shifting unit 29 and input of the inverter 30, which is connected to another input of the phase-shifting unit 29 connected to the input of the intermediate pulse distribution unit 31, the output of which is connected to the input unit of the forming unit and a pulse distribution, to the other inputs of which the output of the comparators 33 and the output of the pulse expansion unit 34 are connected, and the output of the comparators 33 is also connected to the input of the pulse expansion unit 34. In-channel 26 current control one block input

The comparison is connected to the output of the current setting unit 35, and another input to the output of the current sensor 36 of traction motors 5, the input of the comparators 33 is connected to the output of the sensor 19 overcharging the first chopper 7, and the remaining input of the phase shifter

29 is connected to the output of the master oscillator 37, and the output of the pulse shaping and distribution unit 32 is connected to the thyristors 15-18 of the first chopper 7. In the current control channel 27, one input of the comparison unit 28 is connected to the code of the voltage setting unit 38, and the other input the voltage sensor 39 on the capacitor 4, the input of the comparators 33 is connected to the output of the sensor 19, recharge the chopper 9, and the remaining input of the phase shifter unit 29 is connected to the output of the synchronizer 40 connected to the output of the master oscillator 37, and the outputs of the unit 32 forms pulse distribution and distribution are connected to thyristors 15-18 interrupt 1

bodies 9. The device may also comprise a vacTOTJbi change control conversion unit 41. The electric drive also contains a control panel 42, the outputs of which are connected to the switch 10 modes, to the current task unit 35 and the pulse forming units 32 of channels 26 and 27. The current sensor 36 of the motor group 5 is made in the form of a transformer 43, primary windings 44 . and 45 of which are connected in series and are connected respectively to the thyristor circuit 16 and 15 of the chopper 7 and the common point is connected via a switch. 10 modes to the group of traction motors 5. Parallel to the output winding 46 of the transformer 43 A resistor 47 is connected, the output of which is connected to the current control channel 26. In each control channel 26 and 27, the phase shifter unit 29 has a source

48 reference voltage, channels 49-52, 25 thyristors interrupts & bodies 9 in mode

braking, as well as to the input of the current setting unit 35, fixing at its output a predetermined setpoint level t at the required rate of achievement of this level.

each of which contains a switch 53 with key elements 54 and 55, an integrator 56, consisting of an amplifier 57 with a capacitor 58 in the feedback circuit and a key element 59 for its zeroing and a resistor 60, one output of which is connected to the condenser 58 at the input the amplifier 57, and the other to the output terminal of the key element 54 of the switch 53, and the comparator 61, the input of which through the resistor 62 is connected to the output of the integrator 56 and through the resistor 63 to

When the thyristor 16 is turned on, a circuit is formed: traction electro 45

the output terminal of the key element 55 of the switch 53. One input terminal. motors 5, start-up contactor 12, key elements 54 and 55 of each current sensor 36, thyristor 16, channel choke 49-52 are connected to reference voltage source 48. The other input terminal of the key element 54 of each channel 49 and 50 is connected to the comparison unit 28, and the other input terminal of the key element 54 of the channels 51 and 52 is connected to the inverter 30. The other input terminal of the key element 55 of each channel 49-52 is connected to the common bus. The control inputs of the key elements 54, 55 and 59 are connected to the outputs of the master oscillator 37 in the control channel 26

21, capacitor 20, sensor 19 overcharged, reverse diode 22, choke

24, starting contact 11, traction motors 5, through which recharging of the switching capacitor 20 occurs. After discharge of the switching capacitor 20 to zero, current is displaced along the circuit: a group of traction motors 5, starting constant 12, current sensor 36, thyristor 16 , reverse diode 23, choke

25, starting contact 11, traction motors 5. Moreover, this process of current displacement is accompanied by further recharging of the switching capacitor 20. The magnitude of this reloading depends on the joint action of the chokes 21, 24 and 25. The current of the synchronizer 40 in the control channel 27 each, the intermediate distribution block 31 each has two groups 64 and 65 of the elements.2AND-NOT

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the outputs of which are connected to the pulse shaping and distribution unit 32. The outputs of channels 49 and 51 are connected to group 64, and the outputs of channels 50 and 52 to group 65, i.e. to one input of elements 2И-НЕ 66 and 67 and to the inputs of element 2И-НЕ 68, the output of which is connected to other inputs of elements 2И-НЕ 66 67.

The electric drive of the vehicle works in the following way.

The signals from the remote control 42 control, affecting the switch 10 modes,

out contacts 11 and

Contacts 13 and 14, depending on the required vehicle operation solution, are fed to the inputs of the forming unit 32 and the pulse distribution of the control channels 26 and 27, allowing control pulses to pass through the thyristors of the chopper 7 in the start mode and on

, leads to the closure of start-up or brake

deceleration, as well as to the input of the current setting unit 35 will fix at its output the set current setting level at the required rate of reaching this level.

The current of the motor group 5 is stabilized with the aid of the chopper 7, and the maximum allowable voltage level at the capacitor 4 with the help of the chopper 9 by changing the time of the thyristor on state.

When the thyristor 16 is turned on, a circuit is formed: traction motors 5, starting contactor 12, current sensor 36, thyristor 16, choke

motors 5, starting contactor 12, current sensor 36, thyristor 16, choke

21, capacitor 20, sensor 19 overcharged, reverse diode 22, choke

24, starting contact 11, traction motors 5, through which recharging of the switching capacitor 20 occurs. After discharge of the switching capacitor 20 to zero, current is displaced along the circuit: a group of traction motors 5, starting constant 12, current sensor 36, thyristor 16 , reverse diode 23, choke

25, starting contact 11, traction motors 5. Moreover, this process of current displacement is accompanied by further recharging of the switching capacitor 20. The magnitude of this reloading depends on the joint action of the chokes 21, 24 and 25. After complete displacement of the thyristors 16 and

current when turned on - 17 is formed

circuit: power source 1, choke 3, start contact 11, group of traction motors 5, start contact 12., current sensor 36, thyristor 16, restriction choke 21, switching capacitor 20, sensor 19 overcharging, thyristor 17, and source of 1 nutrition. After charging the switching capacitor 20 along this circuit, before the voltage of the source 1nik 1 of the power supply, the process of current displacement into the idle circuit again begins, followed by the dosar house of the switching capacitor 20, the value of which depends on the joint action of only two chokes 21 and 25,

Drive it to the motor of the sensor 19 for recharging the comparators 3-3 and the blocks 34 for expanding the pulses Fia of the first stage of the operation of the interrupters

7 and 9, a mode is eliminated in which, when the thyristors 15 and 18 (16 and 17) are on, the arrival of control impulses on the thyristor 16 (15) is possible, followed by the disruption of the control process. If there is n, and the input of the unit 32 for the formation of pulses of the output eg; The implementation of the pulse expansion unit 34 at the moment when the next control pulse is formed on the thyristors 16 (15) is postponed after the process of recharging the switching capacitor 20 is completed by a time equal to, for example, the estimated time of switching off the thyristors (18X17). On . the second stage of operation of the interrupters to prevent the mode, when thyristors 15 and 17 (16 and 18) turn on, before switching on the recharge of the switching capacitor 20 when the thyristors 15 and 18 are turned on (16 and -17), insufficient charging of the switching capacitor 20 is possible for subsequent switching current from the thyristors 15 (18). Therefore, when the output voltage of the comparators 33 at the input of the pulse shaping unit 32 is 33, the moment of the formation of the next control pulse on the thyristors 17 (18) is postponed until the recharging process ends mutating the capacitor 20,

8 electrodynamic braking when the consumers in the power supply circuit are not able to accept all

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the energy recovered by the traction motors, in order to prevent an excessive increase in the voltage on the capacitor 4, the breaker 9 enters into operation,

- In channel 49 of the phase-matching unit 29, pulse-width modulation of the signal is received at its input from the output of the comparison element 28, in which the difference between the specified signal from the output of the block 35 (38) and the feedback signal from the output of the sensor 36 is selected. (39). At the output of the channel 49, a pulse sequence is obtained. In channel 51 of the phase-shifting block 29, a pulse-width modulation of the inverse value of the signal arriving at its input from the output of the inverter 30 is performed, and a pulse sequence is obtained on its output. Then, in a group of 64 elements 2I-NE 66-68, intermediate distribution unit 31 is detected using a series of logical multiply operations, which, in the pulse shaping unit 32, form one of two control pulse sequences corresponding to the first or second stage regulation thyristor interrupters.

The signals to the control inputs of the key elements 54 and 55 of the switches 53 and the key elements 59 zero integrators 56 channel 26

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The inputs of the master oscillator 37 are shifted by a time equal to half the adjustment period, with respect to the signals received on the control inputs of similar key elements of the voltage control channel 27 from the outputs of the synchronizer 40.

Through the key elements 54 in channel 49, the signal from the output of the comparison element 28 is fed to the input of the integrator 56. Through the key element 54 and the channel 51, the inverted value of the signal from the output of the inverter 30 is fed to the input of the integrator 56. At the same interval, to the inputs of the comparators 61 channels 49 and 51 through the key elements 55 a positive signal is received from the source 48 of the reference voltage, ensuring that the comparators 61 are held in the state O, When switching the key elements 54 and 55, the output voltage

integratorop 56 is defined by it on their polo moves ;; from the source 48 of the reference voltage. The state of the comparators 61, when connecting the output of the resistors 63 through the key elements 55 to the common bus, is determined by the voltage values at the output of the integrators 56 arriving at the inputs of the comparators 61 through the resistors 62. The switch 61 of the channel A9 switches to state 1 at time p passing output voltage of integrator 56 is zero. From the arrival to the control inputs of the key elements 50 of the channels 49 and 51 of the impuses, they close and the capacitors 58 are depleted, preparing the integrators 56 for the sequential cycle and both of them switching the comparators 61 into state 1 independent of the voltage value.

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Claims (3)

1. A vehicle electric drive containing a group of traction motors connected to a power source through an LC input filter and a mode switch, the power circuit of which includes an interrupter whose thyristors are connected in a bridge circuit and diagonal of the switching capacitor reverse diodes driving a generator, and current control channels containing a pulse shaping unit, the output of which is connected to the control electrodes of the thyristors of the chopper, a phase shifting unit, one of the inputs of which It is connected to a master oscillator, a current setting device and a current sensor of a group of traction electric motors and reactors, distinguished by the fact that, in order to increase accuracy and extend the control range, it is equipped with a recharge current sensor in the switching capacitor circuit connected by terminals through reverse diodes to one the terminals of the reactors connected by other leads to the input LC filter, and the current control channel is connected to the output of the specified recharge sensor, a comparator unit, ,, ten 15 20 ai nuuu 25 p, s a55 1A30304 - United thirty 35 40 45 50 eight the input with its output by the pulse expansion unit, the intermediate pulse distribution unit, the inverter and the output connected to its input by the comparison unit, the inputs of which are connected to the output of the current generator and the current sensor of the traction motor group, and the output to the second input of the phase-shifting unit, the third input of which connected to the output of the inverter, and the output to the input of the intermediate pulse distribution unit, the chimney of which is connected to one of the inputs of the pulse shaping unit, the other inputs of which are connected to the output of the pulse expansion unit and to the output of the comparator unit. 2. The electric drive according to claim 1, which is based on the fact that the phase-shifting unit contains a source of reference voltage and four channels, each of which is made on a switch, the output of which is connected to the integrator input, in parallel with which is connected a key element with a control input, connected to the first input of the phase-shifting unit, connected with the commanded input of the com-. a mutator, and the integrator output is connected via a voltage divider to a comparator, with one of the outputs of the comparators of all channels being the output of the phase-shifting unit, and one of the inputs of the switches is connected to; the source of the reference voltage, the other inputs of the switches of one channel - with the second input of the phase shift - south; its block, and the other channels with the third input of this block. 3. The electric drive according to claim 1, which is based on the fact that the block of distribution of intermediate pulses contains two groups, each of which consists of 2I-NOT elements, the inputs of the first of which and one of the inputs of the second and third elements 2I- NOT are the inputs of the intermediate pulse distribution unit, and the other inputs of the second and third elements 2I-NOT are connected to the output of the first element 2I-NOT, while the outputs of the elements 2I-NOT are the outputs of the intermediate pulse distribution unit. ept / p.2