SU521159A1 - Device for converting a direct current traction motor to recovery mode - Google Patents

Description

a bridge 12 and a transformer 13 of direct voltage, having two windings 14 and 15 of the control, one of (14) of which is connected through a limiting resistor 16 in parallel to the motor korea 17, and the other (15) through a limiting resistor 18 and a separating diode 19 in parallel to contacts 20 of line contactor 21 controlled by a regeneration relay 22. The exciter winding 23 of the exciter is connected to the output of the regulator 8, and the excitation winding 25 of the drive motor is connected to its core 24. The magnitude of the current in the motor core 17 is monitored by the current sensor 26 and compared in the comparison element 27 with a predetermined value.

The device works as follows.

In the initial state, it is disconnected from the power source. When the device is connected to the power source, the DC voltage is applied to the control unit 1 and the thyristor controller 8 for driving the exciter 9, and the alternating current voltage to the working windings of the sensor 10 compared with the voltage. In this way, transistor 2 of control unit 1 opens and shunts Zener diode 6. Transistor 7 is closed, because there is a bias voltage equal to the voltage drop on resistor 5 and the collector-emitter junction of transistor 2, and the voltage drop on sensor 11 of sensor 10 is nanometer. wives missing. The main thyristor of the regulator 8 is open and the excitation winding 23 of the driver 9 is powered. The forced excitation of the exciter 9 begins. The voltage on the core 24 of the exciter 9 increases, the current of the excitation winding 25 of the drive motor and its EMF increases. A voltage proportional to the motor EMF is flowing across the winding 14 of the voltage comparison sensor 10, and there is no current in the winding 15, since the voltage of the contact network is still more EMF and the diode 19 is closed.

On the measuring element 11 sensors

10 voltage comparison there is a voltage drop proportional to the emf of the motor.

As the capacitor 8 of the control unit 1 charges, the voltage drop across the resistor 5 and the junction collector-emitter of transistor 2 increases at a given rate determined by its gain and the capacitance value of the capacitor 3. This rate of change of voltage and, hence, voltage displacement of the transistor 7 sets the required rate of increase of the emf of the motor. When the voltage drop across the measuring element

11, the voltage comparison sensor 10 will become greater than the bias voltage of the transistor 7, the latter opens, and the main thyristor of the regulator 8 closes. The excitation current of the driver 9, the excitation current of the engine and its emf are reduced. The bias voltage of the transistor 7 becomes again greater than the voltage drop on the measuring element 11 of the voltage sensor 10, the head thyristor opens, and so on. Thus, the motor emf increases in a predetermined

temp.

When the EMF of the traction motor becomes greater than the voltage in the contact network, a signal is given to turn on the recovery relay 22, and a diode 19 opens and a current appears in the control winding 15 of the voltage sensor 10. This increases the voltage drop across the cell 11 and the excitation current of the driver 9 is maintained so that the difference between the motor EMF and the voltage in the contact network

kept constant until

so far) i.e. switch on relay 22 recuperation and

line contactor 21.

After turning on the line contactors

The etch winding 15 of the comparison voltage sensor 10 is short-circuited, the voltage drop across the element 11 is reduced, and the transistor 7 of the control unit 1 is closed. The device enters the drive motor regulation mode for the regeneration current constant, the magnitude of which is supplied from the current sensor 26 to the reference element 27. The voltage drop across resistor 5 and

the collector-emitter junction of transistor 2 increases until the transmitter reaches the voltage level of stabilization of Zener diode 6. Upon reaching this level, Zener diode 6 breaks through and sets

constant bias transistor 7 of the control unit 1. This reference voltage corresponds to the maximum allowable EMF value of the traction motor. When in the process of recovery the voltage on it

reaches this value, the device operates in voltage stabilization mode.

Claims (1)

Formula invented A device for converting a direct current DC motor to a regeneration mode, consisting of a contact voltage sensor and motor EMF and a contactless excitation exciter with a control unit containing a transistor, the base of which is connected to the junction point of the resistor and capacitor connected to the power source, characterized by that, in order to reduce the time for the engine to go into recovery mode without overshooting its EMF, the control unit is equipped with a parallel emitter-collector transition a zener diode transistor and another transistor, the emitter of which is connected with the anode of the said zener diode, the collector with the input of the excitation controller, the base of which n the zener cathode is connected to the output of the reference sensor.