| 摘要 |
PROBLEM TO BE SOLVED: To simplify a circuit configuration by making each ground of a motor driving unit and a control unit common, and supplying a voltage detection signal to the control unit directly. SOLUTION: Power of a DC drive power source 2 of DC 280V from the AC/DC power source 1 of this circuit is supplied to a motor driving unit 3 composed of a PWM inverter, and drive signals 4 of a specified pulse width composed of those for phase-U, phase-V, and phase-W are supplied to a motor M. Besides, a voltage detection signal 10A from a voltage detecting unit 10 by voltage dividing with resistors composed of a pair of series resistors R1, R2 connected to the DC drive power source 2, is inputted directly to a control unit 7, and besides power of the DC drive power source 2 is supplied to the DC/DC control power source 5 of a switching power source having a common input/output ground. And power of a controlling power source 6 from the DC/DC control power source 5 is supplied to the control unit 7, and a control signal 8 is inputted to the motor driving unit 3, and the pulse-width-controlled drive signals 4 are inputted into the motor M to perform a fixed drive. Consequently, it becomes possible to simplify the circuit configuration. |
