| 摘要 |
PURPOSE:To perform proper commutation without being affected by the previous timing and noises. CONSTITUTION:The rotor 3 of a brushless motor 2 is rotated by controlling an inverter 1 equipped with a plurality of switching elements S1-S6 when the measured value of the second measuring means 9b for measuring the period when the rotor 3 of a brushless motor 2 is in the position where the induced voltage is negative has become half the measure value of the first measuring means 9a for measuring the period when this rotor is in the position where the induced voltage is positive. |
