Motor drive apparatus
AssigneeDenso Corporation
InventorsKanta ARAI, Hideki KABUNE, Yasuhiko MUKAI
Life of this patent
Estimating the term…
Abstract
When a failure detection part detects a failure in an inverter circuit in a first power supply system, a drive control part stops the inverter circuit from driving a motor. An on/off control part turns off a first power supply relay of a power supply on/off part. Under a state that the inverter circuit stops a motor driving operation, a first coil set of the motor generates an induced voltage by rotation caused by an external force. The induced voltage is regenerated to a battery from the inverter circuit through a second power supply relay and a parasitic diode of the first power supply relay. Thus, circuit elements in the power supply system, which is failing, are protected from breaking down.
Claims4
A motor drive apparatus for driving a motor including a plurality of coil sets, each of which is formed of coils of a plurality of phases, the motor drive apparatus comprising:
- a plurality of inverter circuits, which is provided in correspondence to the plurality of coil sets and supplies electric power to the plurality of coil sets by converting an electric power supplied form an electric power source;
- an electric power supply on/off control circuit, which is provided in each power supply system between the electric power source and the inverter circuit and electrically conducts and interrupts the electric power source to and from the inverter circuit;
- a failure detection part, which detects a failure in the inverter circuit in each power supply system;
- a drive control part, which stops the inverter circuit in a failing power supply system from driving the motor, the failing power supply system corresponding to the power supply system having the failure detected by the failure detection part;
- and
- an on/off control part, which controls the electric power supply on/off circuit of the failing power supply system to a regenerative current conduction state when the failure detection part detects the failure, the regenerative current conduction state allowing the regenerative current to flow in a direction from the inverter circuit to the electric power source.
Dependencies are inferred from the claim text.