| 摘要 |
PURPOSE:To prevent unnecessary consumption of internal current in the stationary rotation of a motor, by using the current consumed in an upside current circuit to a downside output current circuit as it is. CONSTITUTION:The output current of each U-, V-and W-phases is switched ON or OFF by the signals from a Hall amplifier 1, so that the combination of up and down phases is decided. A control current supply circuit 2 supplies small current flow in the stationary rotation of a motor and large current flow in its start-up in accordance with the motor rotation. The control current from the control current supply circuit 2 is supplied through as mirror circuit 3 to upside output current circuits 4-6 of each U-, V-and W-phases. As downside output current circuits 7-9 are connected in series to the upside output current circuits 4-6, the current consumed in the upside output current circuits 4-6 is used almost as it is. |
