Controller and control method for motor/generator
First Claim
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.
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Accused Products
Abstract
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.
55 Citations
9 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. 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:
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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;
means for detecting an abnormality in each inverter;
means for controlling the input signal to an abnormal inverter that has an abnormality to stop supplying the polyphase alternating current; and
means for controlling a voltage step 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.
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9. A control method of a plurality of inverter which drive a motor/generator, the motor/generator comprising a plurality of groups of coils and each of the inverters converting a direct current into a polyphase alternating current and supplying the polyphase alternating current to each of the plurality of groups of coils in response to an input signal, the method comprising:
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detecting an abnormality in each inverter;
controlling the input signal to an abnormal inverter that has an abnormality to stop supplying the polyphase alternating current; and
controlling 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.
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Specification