초록 ▼

A motor/generator (20) is provided with plural groups of coils (6), and inverters (30) supplying a polyphase AC current converted from a DC current to each group of coils (6) in response to pulse width modulation signals output by a microprocessor (25, 35). The microprocessor (25, 35) is programmed

A motor/generator (20) is provided with plural groups of coils (6), and inverters (30) supplying a polyphase AC current converted from a DC current to each group of coils (6) in response to pulse width modulation signals output by a microprocessor (25, 35). The microprocessor (25, 35) is programmed to prevent increases in high frequency components in the polyphase AC current by controlling a specific inverter (30) to stop supplying the polyphase AC current (S20), when a load on the motor/generator is smaller than a reference load (S12). As a result, energy conversion efficiency of the motor/generator at low loads is improved.

대표청구항 ▼

1. A controller for a motor/generator, the motor/generator having a plurality of groups of coils and being operated by supplying a polyphase alternating current to each of the plurality of groups of coils, the controller comprising:a plurality of inverters each converting a direct current into the p

1. A controller for a motor/generator, the motor/generator having a plurality of groups of coils and being operated by supplying a polyphase alternating current to each of the plurality of groups of coils, the controller comprising:a plurality of inverters each converting a direct current into the polyphase alternating current and supplying the polyphase alternating current to each of the plurality of groups of coils in response to an input signal, each inverter being provided with a voltage step up converter which raises a voltage of a direct current supplied to a corresponding inverter; a sensor which detects an abnormality in each inverter; and a microprocessor programmed to: control the input signal to an abnormal inverter that has an abnormality to stop supplying the polyphase alternating current; and control a voltage step up converter corresponding to a normal inverter to increase a voltage of the direct current supplied to the normal inverter as a number of abnormal inverters increases.