Motor drive apparatus and electric power steering system using the same
First Claim
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1. A motor drive apparatus for driving a motor having a plurality of coil sets, the motor drive apparatus comprising:
- a plurality of inverter circuits provided for each of the coil sets for supplying electric power from a power source to the coil sets;
a plurality of shut-off circuits connected to the power source through a power supply wire and to the inverter circuits for shutting off the power supply from a power source side to inverter circuit sides; and
a control circuit including a switching control part, a conduction state check part and a wire-break determination part,the switching control part controlling switching-over of conduction and shut-off of the shut-off circuits,the conduction state check part checking whether the power is supplied to a motor side from shut-off circuits side with respect to each of the shut-off circuits, andthe wire-break determination part determining that the wire between the power source and the shut-off circuits is broken, if more than a predetermined number of the shut-off circuits are determined to fail to supply power to the motor side, when the plurality of shut-off circuits are controlled to turn on by the switching control part.
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Abstract
A motor drive apparatus includes a control circuit, which determines that a wire connecting a battery to a first power supply relay and a second power supply relay is broken, and not failure of the power supply relays, if power is not supplied to a motor from the power supply relays when the power supply relays are controlled to turn on. The location of failure can thus be specified accurately. It is only necessary in this case to replace the wire. The motor drive apparatus need not be disassembled or investigated in detail. Man-power for specifying the failure location can be reduced.
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Citations
6 Claims
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1. A motor drive apparatus for driving a motor having a plurality of coil sets, the motor drive apparatus comprising:
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a plurality of inverter circuits provided for each of the coil sets for supplying electric power from a power source to the coil sets; a plurality of shut-off circuits connected to the power source through a power supply wire and to the inverter circuits for shutting off the power supply from a power source side to inverter circuit sides; and a control circuit including a switching control part, a conduction state check part and a wire-break determination part, the switching control part controlling switching-over of conduction and shut-off of the shut-off circuits, the conduction state check part checking whether the power is supplied to a motor side from shut-off circuits side with respect to each of the shut-off circuits, and the wire-break determination part determining that the wire between the power source and the shut-off circuits is broken, if more than a predetermined number of the shut-off circuits are determined to fail to supply power to the motor side, when the plurality of shut-off circuits are controlled to turn on by the switching control part. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification