| 摘要 |
PURPOSE:To suppress the pulsation in the torque of a wound-rotor type induction motor by controlling a reversibly controlled rectifier in response to the instructed value during the commutating period of a power rectifier inserted to the secondary side of a motor and controlling the instructed value with a signal divided by the output voltege during noncommutating period. CONSTITUTION:A power rectifier made of diodes 4-9 and reversibly controlled rectifier made of thyristors 10-15 are provided at the secondary side of a wound-rotor type motor 1, the set speed value 24 is compared with the output of a tachometer generator 2, thereby controlling thyristors 10-15 for controlling the speed. At this time, the conducting states of the diodes 4-9 are respectively detected by detectors 16-21, the added output is compared with the set value 25, thereby switching the switch 31 in the noncommutating period, and controlling the thyristors 10-15 through a divider 30 which divides the error signal by the output voltage of the power rectifier. Accordingly, the pulsation in the torque generated due to the secondary current distortion can be largely reduced, thereby enabling to operate even at the mechanical resonance point. |
