Motor drive device, motor drive method, and computer-readable medium having recorded thereon motor drive program
Provided is a motor drive device comprising a motor control unit that controls a plurality of upper arm-side switching elements and a plurality of lower arm-side switching elements provided to an inverter for driving a motor; a current determination unit that determines whether a motor current flowing through at least one switching element of the plurality of upper arm-side switching elements and the plurality of lower arm-side switching elements is equal to or smaller than a threshold value; and a short-circuit control unit that performs switching between all-on of the plurality of upper arm-side switching elements and all-on of the plurality of lower arm-side switching elements, on condition that the motor current is equal to or smaller than the threshold value, in a short-circuiting operation of alternately switching all-on of the plurality of upper arm-side switching elements and all-on of the plurality of lower arm-side switching elements.
1. A motor drive device comprising:
a motor control unit for controlling a plurality of upper arm-side switching elements and a plurality of lower arm-side switching elements provided to an inverter for driving a motor;
a current determination unit for determining whether a motor current flowing through at least one switching element of the plurality of upper arm-side switching elements and the plurality of lower arm-side switching elements is equal to or smaller than a threshold value; and
a short-circuit control unit for performing switching between all-on of the plurality of upper arm-side switching elements and all-on of the plurality of lower arm-side switching elements, on condition that the motor current is equal to or smaller than the threshold value, in a short-circuiting operation of alternately switching all-on of the plurality of upper arm-side switching elements and all-on of the plurality of lower arm-side switching elements.
2. The motor drive device according to claim 1 , wherein
the short-circuit control unit is configured not to perform the switching, on condition that the motor current exceeds the threshold value, in the short-circuiting operation.
3. The motor drive device according to claim 2 , wherein
the current determination unit is configured to determine whether the motor current flowing through all the switching elements of the plurality of upper arm-side switching elements and the plurality of lower arm-side switching elements is equal to or smaller than the threshold value.
4. The motor drive device according to claim 2 , wherein
the short-circuit control unit is configured not to perform the switching, on condition that a temperature of at least one switching element of the plurality of upper arm-side switching elements and the plurality of lower arm-side switching elements is equal to or lower than a reference temperature, in the short-circuiting operation.
5. The motor drive device according to claim 2 , wherein
the current determination unit is configured to set the threshold value higher when a temperature of at least one switching element of the plurality of upper arm-side switching elements and the plurality of lower arm-side switching elements is higher.
6. The motor drive device according to claim 2 , wherein the current determination unit is configured to determine whether the motor current flowing through a wire between the inverter and the motor is equal to or smaller than the threshold value.
7. The motor drive device according to claim 1 , wherein
the current determination unit is configured to determine whether the motor current flowing through all the switching elements of the plurality of upper arm-side switching elements and the plurality of lower arm-side switching elements is equal to or smaller than the threshold value.
8. The motor drive device according to claim 7 , wherein
the short-circuit control unit is configured not to perform the switching, on condition that a temperature of at least one switching element of the plurality of upper arm-side switching elements and the plurality of lower arm-side switching elements is equal to or lower than a reference temperature, in the short-circuiting operation.
9. The motor drive device according to claim 7 , wherein
the current determination unit is configured to set the threshold value higher when a temperature of at least one switching element of the plurality of upper arm-side switching elements and the plurality of lower arm-side switching elements is higher.
10. The motor drive device according to claim 7 , wherein the current determination unit is configured to determine whether the motor current flowing through a wire between the inverter and the motor is equal to or smaller than the threshold value.
11. The motor drive device according to claim 1 , wherein
the short-circuit control unit is configured not to perform the switching, on condition that a temperature of at least one switching element of the plurality of upper arm-side switching elements and the plurality of lower arm-side switching elements is equal to or lower than a reference temperature, in the short-circuiting operation.
12. The motor drive device according to claim 11 , wherein
the short-circuit control unit is configured not to perform the switching, on condition that a minimum temperature of on-state switching elements of the plurality of upper arm-side switching elements and the plurality of lower arm-side switching elements is equal to or lower than the reference temperature, in the short-circuiting operation.
13. The motor drive device according to claim 12 , wherein
the current determination unit is configured to set the threshold value higher when a temperature of at least one switching element of the plurality of upper arm-side switching elements and the plurality of lower arm-side switching elements is higher.
14. The motor drive device according to claim 11 , wherein
the current determination unit is configured to set the threshold value higher when a temperature of at least one switching element of the plurality of upper arm-side switching elements and the plurality of lower arm-side switching elements is higher.
15. The motor drive device according to claim 11 , wherein the current determination unit is configured to determine whether the motor current flowing through a wire between the inverter and the motor is equal to or smaller than the threshold value.
16. The motor drive device according to claim 1 , wherein
the current determination unit is configured to set the threshold value higher when a temperature of at least one switching element of the plurality of upper arm-side switching elements and the plurality of lower arm-side switching elements is higher.
17. The motor drive device according to claim 16 , wherein
the current determination unit is configured to set the threshold value higher when a minimum temperature of on-state switching elements of the plurality of upper arm-side switching elements and the plurality of lower arm-side switching elements is higher.
18. The motor drive device according to claim 1 , wherein the current determination unit is configured to determine whether the motor current flowing through a wire between the inverter and the motor is equal to or smaller than the threshold value.
19. A motor drive method comprising:
controlling a plurality of upper arm-side switching elements and a plurality of lower arm-side switching elements provided to an inverter for driving a motor;
determining whether a motor current flowing through at least one switching element of the plurality of upper arm-side switching elements and the plurality of lower arm-side switching elements is equal to or smaller than a threshold value; and
performing switching between all-on of the plurality of upper arm-side switching elements and all-on of the plurality of lower arm-side switching elements, on condition that the motor current is equal to or smaller than the threshold value, in a short-circuiting operation of alternately switching all-on of the plurality of upper arm-side switching elements and all-on of the plurality of lower arm-side switching elements.
20. A computer-readable medium having recorded thereon a motor drive program that, when executed by a computer, causes the computer to function as:
a motor control unit for controlling a plurality of upper arm-side switching elements and a plurality of lower arm-side switching elements provided to an inverter for driving a motor;
a current determination unit for determining whether a motor current flowing through at least one switching element of the plurality of upper arm-side switching elements and the plurality of lower arm-side switching elements is equal to or smaller than a threshold value; and
a short-circuit control unit for performing switching between all-on of the plurality of upper arm-side switching elements and all-on of the plurality of lower arm-side switching elements, on condition that the motor current is equal to or smaller than the threshold value, in a short-circuiting operation of alternately switching all-on of the plurality of upper arm-side switching elements and all-on of the plurality of lower arm-side switching elements.