| 摘要 |
<p>PURPOSE:To obtain the prescribed torque when a vehicle moves backward without increasing the current of an inverter by continuously varying the angular velocity of the output voltage of the inverter over positive and negative ranges. CONSTITUTION:A detector 5 detects a motor rotating frequency fM by the output of a pulse generator 4, and a discriminator 6 detects the rotating direction of a motor 3. A code inverter 15 outputs the frequency fM in the same polarity when a vehicle moves forward and in the inverted polarity when the vehicle moves backward. An inverter frequency command fip added with a slip frequency command value fSP and a rotating speed detection signal fMA is applied to an inverter 2. An inverter voltage command VM in response to a deviation between a current command IMP and a motor current IM is applied to the inverter 2.</p> |
