Apparatus and method for controlling brushless DC motor

Details Apparatus and method for controlling brushless DC motor Apparatus and method for controlling brushless DC motor

2006-09-26

2006-09-26

Donovan, Lincoln (Department: 2837)

Electricity: motive power systems

Limitation of motor load, current, torque or force

C318S132000, C318S254100, C318S799000, C318S800000, C318S801000, C318S802000, C318S803000

Reexamination Certificate

active

07112936

ABSTRACT:
An apparatus and method for controlling a brushless DC motor, which minimizes a torque ripple thereof, and includes a power converting unit to convert alternating current (AC) power to polyphase AC power and to supply the polyphase AC power to the brushless DC motor. A rotator position/speed detecting unit detects status information of a rotator. A terminal voltage detecting unit detects variations of terminal voltages of the polyphase AC power. A control unit detects phase commutation periods of the polyphase AC power using the status information provided from the rotator position/speed detecting unit and the terminal voltage variation information of the polyphase AC power provided from the terminal voltage detecting unit. The control unit controls the power converting unit to supply a compensation voltage used to constantly maintain a mean voltage of a non-commutation phase of the polyphase AC power during the detected phase commutation periods.

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