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US 9,543,865 B2Granted
Device for driving three-phase brushless motor
AssigneeHitachi Automotive Systems, Ltd.
InventorMasaki Hano
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AssigneeHitachi Automotive Systems, Ltd.
InventorMasaki Hano
Estimating the term…
The present invention allows a driving device, which drives a three-phase brushless motor in a sensorless manner, to detect an initial position of the brushless motor and start drive of the motor without performing positioning processing. In a device for driving a brushless motor by sequentially switching six energizing modes, in which two phases to be energized are selected out of three phases, energization is performed sequentially in six energizing modes before start of drive so that the motor does not rotate, and each induced voltage of an opened phase is acquired, induced voltage difference is obtained in each predetermined combination of energizing modes, and it is estimated to which one of six divided regions an initial position of the brushless motor corresponds based on a maximum value of induced voltage differences obtained.
A device for driving a three-phase brushless motor, wherein the device performs energization between one phase, and the rest of two phases out of three phases of a brushless motor so that current in the one phase become positive and negative, and detects an initial position of the brushless motor based on a difference between induced voltage in an opened phase when current of the one phase becomes positive, and induced voltage of an opened phase when current of the one phase becomes negative.
A method for detecting an initial position of a three-phase brushless motor, wherein energization is performed between one phase, and the rest of two phases out of three phases of a brushless motor so that current in the one phase becomes positive and negative, and an initial position of the brushless motor is detected based on a difference between induced voltage of an opened phase when current of the one phase becomes positive, and induced voltage of an opened phase when current of the one phase becomes negative.
Dependencies are inferred from the claim text.