| 摘要 |
PROBLEM TO BE SOLVED: To provide a coil changeover device provided to a 3-phase AC electric motor, capable of drastically reducing the number of configuration components, of reducing power loss, and of securing reliability.SOLUTION: With respect to a first operation power supply circuit 31, an anode terminal of a first diode Da is connected to a plus terminal of a DC power supply G via a first resistor Ra, and a cathode terminal of the first diode Da is connected to a first neutral line NL1 via a first charging capacitor Ca. A current path configured by the DC power supply G, the first resistor Ra, the first diode Da, the first charging capacitor Ca, and the first neutral line NL1 in this order, is formed. In addition, with respect to a second operation power supply circuit, an anode terminal of a second diode is connected the plus terminal of the DC power supply G via a second resistor, and a cathode terminal of the second diode is connected to a second neutral line via a second charging capacitor. A current path configured by the DC power supply G, the second resistor, the second diode, the second charging capacitor, and the second neutral line in this order, is formed. |
