Patent ID: 11952057
Assignee: NIDEC CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC B  H | IPC B  H

Claim 0:
1. A motor control system for driving a motor having a phase number n of three or more, comprising:
an inverter that drives the motor; and
a control calculation unit that calculates a current command value indicating a current to be supplied to the motor from the inverter on the basis of a target current command value given from the outside as a control target of the motor, and feeds back an actual current detection value indicating a current supplied to the motor from the inverter to the current command value to feedback-control the inverter, wherein
the control calculation unit includes
a voltage control calculation unit that calculates a voltage command value indicating a voltage to be applied to the motor from the inverter on the basis of a current deviation between the current command value and the actual current detection value,
a torque ripple compensation calculation unit that adds a compensation value for compensating a torque ripple in the motor to a signal value on an upstream side in a signal flow that passes through the voltage control calculation unit, and

the torque ripple compensation calculation unit includes
a phase compensator that calculates a compensation value component in the voltage control calculation unit on the basis of an actual angular velocity value indicating an angular velocity at which the motor rotates, and
an inverse characteristic calculation processor that calculates a compensation value component for compensating the torque ripple on the basis of an inverse characteristic of an open loop transfer function in the feedback control, and

a current limit calculation unit configured to limit the target current command to a predetermined value or less, wherein the current limit calculation unit is upstream of the torque ripple compensation calculation unit, wherein
the inverter is configured to control the motor based on the current command value.