SU1232521A1 - Device for equalizing loads of rolling stock traction electric motors - Google Patents

Description

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11232521

The invention relates to transport, in particular, to devices for individually controlling the loads of a traction motor of a rolling stock with engines of independent excitation.

The purpose of the invention is to increase efficiency.

FIG. 1 is a functional block diagram of the proposed device; FIG. 2 - timing diagrams of currents and voltages in the elements of the device.

The device contains the regulator 1 of the excitation current and the crustal currents, the inputs of which are connected to the pull power setting device 2, the driving frequency setting device 3, the driving current sensor 4, the rotation frequency sensor 5. The sensors 6 and 7 of the crust currents of the traction motors are connected to the inputs of the block 8 at the maximum signal and to one of the inputs of the blocks 9 and 10 of the comparison. The output of block 8 is connected to the input of the controller 1 of the excitation current and the crust currents and to the other inputs of the blocks 9 and 10 of the comparison. The outputs of blocks 9 and 10 are connected to one of the inputs of multiplication blocks 13 and 14 through delay elements 11 and 12, to the other inputs of which the excitation current sensor 4 is connected via nonlinearity block 15. The outputs of the blocks 13 and 14 through the closing contacts 16 and 17 of the switch 18 and the inverters 19 and 20 are connected to the inputs of the adders 21 and 22. The outputs of the blocks 13 and 14 are connected to the same inputs of the adders 21 and 22 by the closing contacts 23 and 24. Other inputs adders 21 and 22 are connected with the disconnecting contact 25 of the switch 18 with one source 26, and the closing contact 27 with another displacement source 28. The outputs of the adders 21 and 22 are connected to the inputs of the phase regulators 29 and 30, the outputs of which 45 through the limiting aces blocks 31 and 32 and the drivers 33 and 34 are connected to the inputs of the thyristor switches 35 36. The thyristor switches are connected in parallel to the windings 37 and 38 of the excitation traction motors powered by controlled rectifier 39. Anchor windings 40 and 41 of the traction motors are connected to rectifier-inverter converter 42, which, like rectifier 39, is connected to the output of current regulator 1 and core currents.

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The time diagrams show the curve about. voltage at the output of the controlled rectifier 39, S curve of the current of the controlled rectifier 39, curve 6 of the voltage of the thyristor switches 35 and 36, curve of the control voltage at the input of the thyristor switch of 35 and 36, curve of the current of the thyristor switches of 35 and 36 at angles cytt. adjusting the thyristors of the controlled rectifier 39 and adjusting the thyristors of the thyristor keys 35 and 36.

The equalization of loads of traction motors is based on the individual regulation of the excitation currents of motors whose load is less than the maximum. In this case, the misalignment of the loads between the regulated and the most loaded motor is eliminated in the thrust mode by a decrease, and in the regenerative mode, an increase in the excitation current of the regulated motor.

The device works as follows.

At the inputs of the regulator 1, the specified and actual values of the signals from the rotational speed sensors 5-7 and the crust currents and setting units 2 and 3 of the pull (braking) and rotation frequency are compared in the form of voltage. The difference between the set and actual values of the adjustable parameters affects the opening angle of the thyristors of the rectifier-inverter converter 42 and the rectifier 39. By a corresponding change in the unlocking angle of the thyristors of the converter 42, it operates in the mode of the rectifier, through which the core windings 40 are fed and 41, and the inerter mode ,. converting the direct current of the crust windings of 40 and 41 tg engines operating in generator mode into alternating. Through the control rectifier 39, the excitation windings 37 and 38 are energized.

Sensors 6 and 7 measure the crust currents of the parallel branches of the crust windings 40 and 41 of the traction motors, the measured values of the currents go to block 8, which selects the maximum current of the most loaded mt of the 5th motor. The signal, indicated by block 8, is fed to the input of controller 1 and to the summing inputs of blocks 9 and 10 of the comparison, to the subtracting inputs

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which signals are from sensors 6 and 7 of the crustal currents. Signals proportional to the misalignment of the core currents, provided by the comparison units 9 and 10, are fed through delay elements 11 and 12 to the inputs of multiplication units 13 and 14, the other inputs of which receive a signal from the excitation current sensor 4 through the non-linearity unit 15. In this case, elements 11 and 12 of the delay exclude the influence of the slipping processes of the wheel pores on the quality of adjustment. The nonlinearity unit 15 together with the multiplication units 13 and 14 ensures that the gain of the system is controlled according to a dependence close to linear, thus achieving system stability over the entire range.

regulation.

In the pull mode, signals from multipliers 13 and 14 are received through the disconnecting contacts of switch 18 to one of the inputs of adders 21 and 22, the other inputs of which receive a signal through the disconnecting contact 25 of switch 18 from bias source 26.

In regenerative braking mode, signals from multiplication blocks 13 and 14 are received through the closing contacts 16 and 17 of switch 18 to the inputs of inverter 19 and 20, the output of which goes to one of the inputs of adders 21 and 22, to the other inputs of which through closing contact 27 of switch 18 signals come from bias source 28. The output signals of the adders 21 and 22 are fed to the inputs of the phase shifters 29 and 30. The pulse shapers for the thyristor switches 35 and 36 are carried out by the pulse shapers 33 and 34. The input signals of the formers 33 and 34 are received from the phase limiting units 31 and 32, which control the control signals from the phase shifters 29 and 30 only if there is a 5

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voltages on the anodes of the thyristor switches 35 and 36.

. Thus, in the pull mode, the bias source 26 sets the initial phase of the control signals relative to the phase of the voltage of the carrier frequency of the converter 39 to the ANGLE oL ng and, as the control signal is increased, adjusts it from cjt TT to uJt C) that is about an angle limited by blocks 31 and 32, thereby increasing the amount of current through the thyristor switches 35 and 36, thereby reducing the excitation current of the regulated motor and, accordingly, increasing its load.

In regenerative braking mode, the control signals change their polarity using inverters 19 and 20, and the displacement source 28 sets the initial phase of the control signals by angle d, while in the absence of control signals the thyristor keys are open in the range from cji to t.d. When the inverted control signal is increased, the opening angle of the thyristors of the thyristor switches 35 and 36 o TijLit is adjusted to tjJt TG, which leads to a decrease in the current through the thyristor switches 35 and 36 and to an increase in the excitation current of the regulated motor and, consequently, to an increase in its load.

Thus, the device for load balancing of traction motors can be used in traction and regenerative braking modes by changing the operation of the thyristor of the thyristor switches.

The use of the proposed device makes it possible to improve the distribution of traction and braking forces by 10–12%, thereby reducing by 0.2–0.4% the energy consumption per trains and increasing the return of electricity by 0.3–0.5% in regenerative braking mode.

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Compiled by N. Lyskov Editor V. Petrash Tehred And Poprvich Proofreader S. Cherni

Order 2734/19. Circulation 647Subscribe

VNIIPI USSR State Committee

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

Production and processing plant, Uzhgorod, st. Prorkt ({a, 4

Fi9.1

Claims (1)

DEVICE FOR LEVELING LOADS OF TRACTION ELECTRIC MOTORS. ROLLING COMPOSITION, containing a regulator of the excitation current and anchor currents, the first, second and third inputs of which are connected respectively to the traction force setter, setpoint and motor speed sensor, and the outputs to a rectifier-inverter converter included in the power supply circuit of the armature windings and controlled by a rectifier included in the power circuit of the field windings, in parallel with which thyristor switches are connected, the control inputs of which are respectively connected to the outputs of the pulse shapers connected the inputs to the outputs of the phase limiting blocks, the inputs of which are connected to the outputs of the phase regulators, an excitation current sensor connected to the fourth input of the excitation current and armature current regulator and through a nonlinearity block to one of the inputs of the corresponding multiplication blocks, and anchor current sensors connected to one of the inputs of the respective comparison units and the inputs of the maximum signal input unit, the output of which is connected to the fifth input of the excitation current regulator and anchor currents and to other inputs of the comparison units, outputs which are connected via delay elements to the other inputs of multiplication units, characterized in that _with it, in order to increase efficiency, <5 it is provided with springs bias the switch to open and close the contacts, inverters and adders, whose outputs are connected to inputs of respective phase regulators, and one inputs through one opening contact of the switch to one bias source and one. make contacts to another source of bias, while the other inputs of the adders directly through other open contacts and other make contacts and an inverter to the output of the corresponding multiplication unit. SU .... 1232521