| 摘要 |
A phase signal generation circuit is constituted by using a comparison circuit 10, a delay circuit 11, a gate signal preparation circuit 13, and a selection holding circuit 12. A phase signal generated in the phase signal generation circuit 9 is pattern recognized in a control circuit 6 and a position of a rotor is detected and a PWM control area, PAM control, and a change-over PWM/PAM is carried out. The rotor position detection accuracy can be heightened and a wide control. range can be obtained.
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