Motor-driving apparatus
A motor-driving apparatus for driving a motor having a plurality of windings respectively corresponding to a plurality of phases is provided. The motor-driving apparatus includes a first inverter having a plurality of first switching devices and connected to first ends of the plurality of windings and a second inverter having a plurality of second switching devices and connected to second ends of the plurality of windings. A third switching device is configured to selectively connect and disconnect points at which a number of turns of each of the windings is divided in a preset ratio. A controller is configured to adjust an on/off state of the first to third switching devices based on required output of the motor.
1. A motor-driving apparatus for driving a motor having a plurality of windings corresponding to a plurality of phases, respectively, comprising:
a first inverter including a plurality of first switching devices and connected to first ends of the plurality of windings;
a second inverter including a plurality of second switching devices and connected to second ends of the plurality of windings;
a plurality of third switching devices having one-side ends connected to a second end of each of the plurality of windings and the other-side ends connected to each other; and
a controller configured to adjust an on/off state of the first to third switching devices based on required torque of the motor and a reverse magnetic flux value corresponding to the required torque.
2. The motor-driving apparatus of claim 1 , wherein, when the reverse magnetic flux value corresponding to the required torque of the motor is less than or equal to a preset reference value, the controller turns on the plurality of third switching devices and performs pulse-width modulation control on the plurality of first switching devices, thereby driving the motor.
3. The motor-driving apparatus of claim 1 , wherein, when the reverse magnetic flux value corresponding to the required torque of the motor is greater than a preset reference value, the controller turns off the plurality of third switching devices and performs pulse-width modulation control on the plurality of first switching devices and the plurality of second switching devices, thereby driving the motor.
4. The motor-driving apparatus of claim 1 , wherein, when an operating point corresponding to the required torque of the motor corresponds to a first region in a torque-RPM map in which the first region and a second region are previously set, the controller turns on the plurality of third switching devices and performs pulse-width modulation control on the plurality of first switching devices, thereby driving the motor.
5. The motor-driving apparatus of claim 1 , wherein, when an operating point corresponding to the required torque of the motor corresponds to a second region in a torque-RPM map in which a first region and the second region are previously set, the controller turns off the plurality of third switching devices and performs pulse-width modulation control on the plurality of first switching devices and the plurality of second switching devices, thereby driving the motor.
6. A motor-driving apparatus for driving a motor having a plurality of windings corresponding to a plurality of phases, respectively, comprising:
a first inverter including a plurality of first switching devices and connected to first ends of the plurality of windings;
a second inverter including a plurality of second switching devices and connected to second ends of the plurality of windings;
a plurality of third switching devices having one-side ends connected to a second end of each of the plurality of windings and the other-side ends connected to each other; and
a controller configured to form a Y-connection by turning on the plurality of third switching devices based on required torque of the motor and perform pulse-width modulation control on the plurality of first switching devices, thereby driving the motor, or to turn off the plurality of third switching devices and perform pulse-width modulation control on the plurality of first switching devices and the plurality of second switching devices, thereby driving the motor as an open-end winding motor.
7. The motor-driving apparatus of claim 6 , wherein, when a reverse magnetic flux value corresponding to the required torque of the motor is less than or equal to a preset reference value, the controller turns on the plurality of third switching devices and performs pulse-width modulation control on the plurality of first switching devices, thereby driving the motor.
8. The motor-driving apparatus of claim 6 , wherein, when a reverse magnetic flux value corresponding to the required torque of the motor is greater than a preset reference value, the controller turns off the plurality of third switching devices and performs pulse-width modulation control on the plurality of first switching devices and the plurality of second switching devices, thereby driving the motor.
9. The motor-driving apparatus of claim 6 , wherein, when an operating point corresponding to the required torque of the motor corresponds to a first region in a torque-RPM map in which the first region and a second region are previously set, the controller turns on the plurality of third switching devices and performs pulse-width modulation control on the plurality of first switching devices, thereby driving the motor.
10. The motor-driving apparatus of claim 6 , wherein, when an operating point corresponding to the required torque of the motor corresponds to a second region in a torque-RPM map in which a first region and the second region are previously set, the controller turns off the plurality of third switching devices and performs pulse-width modulation control on the plurality of first switching devices and the plurality of second switching devices, thereby driving the motor.