| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve the inferiority of starting a sensor-less motor, by eliminating the problem that a beat lock is difficult to be prevented only by making a partial mask of a zero-cross detection range of the motor driving gear. <P>SOLUTION: The motor driving gear having a signal processing circuit for driving the sensor-less motor is provided with a detection means for detecting whether a zero-cross of back electromotive voltage generated in a drive coil of the sensor-less motor and neutral point voltage are in the prescribed timing or not; a counting means being reset based on an output of the detection means when the zero-cross is in the prescribed timing and performing counting based on an output of the detection means when the zero-cross is not in the prescribed timing; a brake means performing braking till the sensor-less motor is stopped based on an output when the counting means counts the prescribed value; and a start indicating means performing indication of the signal processing circuit for starting the sensor-less motor after it is stopped. In this way, inferiority of starting the sensor-less motor is surely detected, so as to make it surely capable of starting. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
