TORQUE DISTURBANCE CANCELLATION FOR A MOTOR

摘要

A circuit may be configured to adjust a correction signal for each phase of an electric motor based on a rotational position of a spindle of the electric motor, generate a distorted waveform based on the correction signal, and drive the electric motor in response to the distorted waveform. In some examples, back electromotive force (BEMF) may be determined in order to adjust a motor drive waveform, which may reduce or eliminate motor vibrations. A motor drive signal may be pre-warped (i.e. distorted) such that when the correctional signal and drive signals are combined, there is a reduction in acoustic emissions or motor vibrations. Other parameters, such as cogging torque, may be measured to reduce motor vibration and acoustic emissions.

主权项

1. A method comprising:
measuring operating parameters of a spindle motor that drives a spindle to rotate; determining a correction signal based on the operating parameters of the spindle motor, the correction signal generated to reduce torque disturbance at the spindle motor; generating a waveform having distortion based on the correction signal; and applying the waveform to control operation of the spindle motor.