| 摘要 |
In a sensorless motor driving device for driving a motor by controlling the energization of the coils of individual phases of the motor according to the result of detecting the position of the rotor of the motor without using an external sensor, before the motor is started, which phase to energize first when the motor is started is determined according to the result of detecting the position in which the rotor is at rest by exploiting the fact that the coils of the individual phases have varying apparent inductances according to the position in which the rotor is at rest. This circuit configuration permits the motor to be started always in the same rotation direction, and thus prevents reverse rotation of the motor.
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