| 摘要 |
PROBLEM TO BE SOLVED: To provide the control device of a brushless motor for enabling advance angle control for allowing the switching time of the conduction state of a switching element to precede the change time of a rotor magnetic pole which is detected by a magnetic sensor, regardless of software. SOLUTION: If a capacitor C2 is charged, when the magnetic pole of a sensor magnet 5 detected by magnetic sensors IC1-IC3 changes, and the voltage reaches a rotational speed signal FV1 corresponding to the change frequency of the magnetic pole, a second timer circuit 50 inverts an advance angle time setting signal MS to a high-voltage level. A latch circuit 110 generates advance angle post-signal S1B-S3B, that are made to precede advance angle with respect to pre-signals S1-S3 by advance angle time, based on the advance angle time setting signal MS. When the rotational speed signal FV1 exceeds an advance angle start rotational speed setting FV/MG, a selection circuit 120 selects the advance angle post signal, and a switching circuit 20 is driven by a gate signal which is generated from the advance angle post-signal.
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