| 摘要 |
A position detection section 10 outputs a position signal 101 indicating the relative position between motor windings L 1 to L 3 and a rotor 60. A crossing detection section 20 a outputs a rotation signal 241 indicating the magnitude relation between the position signal 101 and a reference signal 102. An energization control signal generation section 30 generates, based on the rotation signal 241, energization control signals 301 for the motor windings L 1 to L 3. An edge signal 221 is outputted when the magnitude relation of the two signals is reversed, and a mask signal 231 is outputted over a predetermined period of time from when the edge signal 221 is outputted. While the mask signal 231 is being outputted, the crossing detection section 20 a continuously outputs, as the rotation signal 241, a comparison result signal 211 which had been inputted before the mask signal 231 was outputted.
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