| 摘要 |
PURPOSE:To reduce the torque and the velocity ripple of a motor and at the same time to stabilize the motor operation in its stop state. CONSTITUTION:A voltage type inverter 1 is provided together with a motor 2 which is driven by the inverter 1, a speed detector 3 which detects the revolving speed of the motor 2, a current detector 4 which detects the current of the motor 2, a speed control part 5 which controls the current command of the motor 2 based on the deviation between a speed command signal which commands the revolving speed of the motor 2 and a real speed signal obtained by the detector 3, and a control circuit 11 which produces a PWM pattern from the deviation between the command current of the part 5 and the real current obtained by the detector 4 and controls the ON/OFF timing of the inverter 1. Then the circuit 11 switches the ON/OFF order within a single cycle by a current deviation code. |
