SPEED CONTROLLING DEVICE FOR ELECTRIC MOTOR VEHICLE

摘要

PURPOSE:To control a load share irrespective of the torque vs. speed characteristics by comparing the detected speed of a vehicle or a motor with a target speed and controlling the magnitude of the slip frequency of an induction motor on the basis of the compared result. CONSTITUTION:A DC current from a DC power source 1 is converted into a predetermined voltage of predetermined frequency by a stationary type converter 4 controlled by a pulse signal from a pulse width modulator 13, and is applied to an induction motor 6. The rotor speed of the motor 6 or the speed of the vehicle is detected by a pulse generator 7, and the detected speed signal is compared with a speed instruction signal 14 by a comparator 21. A slip frequency function generator 22 generates a slip frequency signal on the basis of the compared result to the modulator 13. The modulator 13 generates a control pulse on the basis of the voltage control signal from the low priority circuit 18 and the signal. The output of the comparator 21 is also inputted to the power driving brake discriminator 23.