| 摘要 |
PURPOSE:To control 3-phase current by one set of current amplifying circuit, by switching a current feedback signal for respective phases based on an information on the phase of a motor. CONSTITUTION:A current amplifier 30 processes the operation of a current command Id, inputted through a resistor 27, and a current feedback signal, inputted through an input resistor 28. Normally opened switches SW1, SW2, SW3 are connected to the input resistor 28 and the feedback of respective U, V, W phase current feedback signals 18, 19, 20 is effected. The switches SW1, SW2, SW3 are controlled by a signal from a PG processing circuit 4 in accordance with the phase of a pulse generator 9. |
