CONTROLLING UNIT FOR INDUCTION MOTOR VEHICLE

摘要

PURPOSE:To obtain a stable torque independent of electric vehicle speeds by a method wherein a gain correcting means is provided to correct changes in loop gain in a current regulating system subjected to induction motor impedance changing in accordance with the frequencies outputted by an inverter. CONSTITUTION:A frequency adjusting means 8 adds a slip frequency fs or subtracts it from a speed frequency fn dependent upon vehicle speeds for the determination of the output frequency (f) of an inverter 4. A gain correcting means 13 yields a signal correcting changes in loop gain present in a current regulating system subjected to induction motor impedance changing to frequencies outputted by the inverter 4. A multiplying means 14 multiplies the difference between a directing current ip for a motor current IM and the detected value iM by the output of a gain correcting circuit 13. The product is supplied to the flow rate regulating means 12 of the inverter 4 for the regulation of the flow rate gamma in the inverter 4.