JPS6249839B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device for a motor-generator for a vehicle, in which the motor side is a DC compound-wound motor, and the number of rotations is controlled to be constant by adjusting the separately excited winding current. The purpose of this is to improve the rectification of a vehicle motor-generator in which the motor side has multiple windings.

FIG. 1 shows the overall main circuit configuration of this type of motor-generator with multiple windings on the motor side. FIG. 1 is an example of a circuit connection diagram of a control device for a vehicle motor generator applied to the present invention, in which 1 is a current collector that supplies power from the overhead contact line, 2 is a circuit disconnector, and 3 4 is a starting resistance, 4 is a series resistor, 5 is an armature of a DC compound motor, and 6 is a series field winding thereof. These circuit breakers 2 or series-wound field windings 6 are connected in series between the current collector 1 and the ground in this order, and when the circuit breakers 2 are turned on, current flows into this series circuit. flows, and the electric motor starts to start.
A shunt field winding 7 of a DC compound motor is connected in parallel between the negative side of the circuit breaker 2 of the series circuit and the ground side of the series field winding 6. 8 is a starting resistor contactor for short-circuiting the starting resistor 3, and 9 is a separately excited field winding of the DC compound motor. 10 is an armature of a three-phase alternating current generator driven by the electric motor, and 11 is a field winding thereof. This field winding 11 is connected to the armature 1 via an automatic voltage regulator 12.
This connection controls the output voltage of the generator to be constant. 13 is a frequency control device connected to the output terminal of the armature 10, and 14 is a phase control circuit into which the output signal of the frequency control device 13 is input. The output signal of this phase control circuit 14 is given to the thyristor element gate of the field power supply circuit 15. The separately excited field winding 9 of the DC compound-wound motor is connected to the output terminal of an armature 10 of a three-phase alternating current generator via a field power supply circuit 15, as shown.

In the case of a conventional control method in such a configuration, when the contact line voltage suddenly rises, the input current suddenly increases → the rotation speed →
The motor separately excited field current is controlled in the order of frequency detection → motor side separately excited field current control.

FIG. 2 is a block diagram showing the configuration of main parts of a conventional frequency control device, in which 16 is a frequency detector of a motor generator, and 17 is a frequency setter. As shown in the figure, the outputs of the frequency detector 16 and the frequency setter 17 are compared and are input to the phase control circuit 14. Therefore, since the frequency was first controlled by the difference between the output of the 17 frequency setters, large GD ² models (for example, those with a flywheel) were not able to control the frequency (separately excited field). It takes a long time to start controlling the magnetic current (controlling the magnetic current), and it takes a long time for a large amount of current to flow, which is a direct cause of deterioration of rectification.

The present invention has been made in view of these points, and provides a control device for a motor generator for a vehicle that can more quickly attenuate a rapidly increasing input current when the contact line voltage suddenly increases.

The present invention will be explained below with reference to the drawings. In the above-described circuit shown in FIG. 1 applied to the present invention, the frequency control device of the present invention is configured as follows. FIG. 3 is an embodiment of the frequency control device according to the present invention, and is a block diagram showing the main part configuration. In FIG. 3, parts having the same functions as those in FIG. 2 are designated by the same reference numerals. 18 is a di/dt detection circuit that detects the change di/dt of the input current on the motor side with respect to time;
19 is a di/dt setting device, 20 is a di/dt detection circuit 18
This is a frequency setting value control circuit which inputs a comparison deviation output between the output of the di/dt setter 19 and the output of the di/dt setter 19. The output of this frequency set value control circuit 20 is given to a frequency setter 17. As described above, the circuit 18 for detecting the di/dt of the input current on the motor side is provided, and the difference between the detected di/dt and the di/dt set by the di/dt setting device 19 causes the frequency setting device 17 to be adjusted. The purpose is to change the output and control the separately excited field winding 9 of the DC compound motor via the phase control circuit 14 to hasten the attenuation of the input current of the motor generator.

To explain the case where the DC compound-wound motor is a differential compound-wound motor in such a configuration, the di/dt detection circuit 18
When the di/dt of the input current on the motor side detected by the motor exceeds a certain di/dt, the frequency setting value control circuit 20 sets the frequency setting value to zero to prevent an increase in the output frequency due to a sudden rise in contact line voltage. First, the output frequency is relatively increased, the current in the separately excited field winding 9 is controlled to the minimum, the back electromotive force of the motor is increased, and the input current is attenuated. Furthermore, if di/dt of the input current on the motor side falls below a certain di/dt, control is performed to restore the frequency setting value to the original value.

When the DC compound-wound motor is a sum-acting compound-wound motor, it is the same as the case of a differential motor except that the current in the separately excited field winding 9 is controlled to be maximum.

As explained above, in the past, the separately excited field winding current on the motor side was controlled only after the output frequency of the generator increased, but in the present invention, di/dt of the input current on the motor side is detected, Since the output of the frequency setter 17 is set to zero before the output frequency of the generator increases, and the output frequency is relatively increased and controlled, this method is the opposite of that of an electric motor in which control begins to occur more quickly than in the conventional method. Electromotive force can be increased. That is, rectification can be improved by shortening the input current increase time compared to the conventional method.

[Brief explanation of the drawing]

Fig. 1 is a circuit connection diagram of a control device for a vehicle motor generator applied to the present invention, Fig. 2 is a block diagram showing the main part configuration of a conventional frequency control device, and Fig. 3 is a frequency control according to the present invention. FIG. 1 is a block diagram illustrating a main part configuration of an embodiment of the device. 1...Current collector, 2...Circuit disconnector, 3...
Starting resistance, 4...Series resistance, 5...Armature of the DC compound motor, 6...Series field winding thereof, 7
...Same field winding, 8... Starting resistance contactor, 9... Other excitation field winding of the DC compound motor,
10... Armature of a three-phase alternating current generator, 11... Also its field winding, 12... Automatic voltage regulator, 13
... Frequency control device, 14 ... Phase control circuit, 1
5... Field power supply circuit, 16... Frequency detector, 1
7...Frequency setter, 18...di/dt detection circuit,
19...di/dt setting device, 20...frequency setting value control circuit.

Claims (1)

[Claims] 1. In a vehicle motor generator where the motor side is a DC compound-wound motor and the separately excited winding current is adjusted to keep the rotation speed constant, a sudden increase in the input current on the motor side due to a sudden rise in contact line voltage When the change in the current with respect to time is detected, and if the motor side is a differential compound winding, when the change is greater than a certain value,
The electric current in the separately excited winding is controlled to be a minimum, and when the motor side is a harmonic compound winding, the current in the separately excited winding is controlled to be maximized. A control device for a vehicle motor generator.