CPC H02P 23/14 (2013.01) [F25B 31/026 (2013.01)] | 18 Claims |
1. A drive device for an AC motor, the drive device comprising:
an adaptive observer to adaptively estimate an angular velocity of a rotor of an AC motor that drives a mechanical device having periodic load torque pulsations;
a speed control circuitry to determine a first torque command with which an angular velocity command matches an average value of an estimated angular velocity;
a phase lead amount calculation circuitry to calculate, based on a disturbance frequency, a phase lead amount of a transfer function from a true angular velocity to a model deviation that is an internal quantity of the adaptive observer;
a vibration suppression controller to determine, based on a frequency of the load torque pulsations, the model deviation, and the phase lead amount, a second torque command with which speed pulsations in the AC motor are suppressed; and
a torque control circuitry to control a torque of the AC motor based on the first torque command and the second torque command.
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