| 摘要 |
PURPOSE:To detect currents flowing through an AC servomotor correctly from a DC circuit by mounting detecting resistors in response to the direction that currents flow. CONSTITUTION:When currents flow through an inverter 2 from a DC power supply 1 and an AC servomotor 13 is turned, currents flow through a first current detecting circuit 3 consisting of a diode 8 and a resistor 7, and voltage proportional to currents is detected in the resistor 7. When currents flow through the DC power supply 1 from the inverter 2 through diodes for the inverter 2 by the back electromotive force of the AC servomotor 13, currents flow through a second current detecting circuit 4 composed of a diode 6 and a resistor 5, and voltage proportional to currents is detected in the resistor 5. |
