Motor drive apparatus and motor drive control method

Details Motor drive apparatus and motor drive control method Motor drive apparatus and motor drive control method

2008-05-20

2010-12-14

Ip, Paul (Department: 2837)

Electricity: motive power systems

Synchronous motor systems

Brushless motor closed-loop control

C318S685000, C318S779000, C318S801000, C361S023000, C361S031000, C361S033000

Reexamination Certificate

active

07852026

ABSTRACT:
A protection circuit is configured to change control modes in a drive control process of a drive circuit for a motor when overvoltage is applied to a power source line while the motor is driven. With overvoltage applied, the control process is changed to a control mode to perform forced commutation control. When a predetermined time period passes after the voltage of the power source line returns to a predetermined level, the control process is changed to a sensorless control mode using a position detection circuit. This configuration can provide a motor drive apparatus capable of performing an overvoltage protection operation appropriately even when the sensorless control mode is adopted.

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