| 摘要 |
PROBLEM TO BE SOLVED: To drive a brushless motor without dropping its revolving speed regardless of a temperature increase.SOLUTION: When a vehicle brushless motor 10 is rotated at a predetermined revolving speed or lower, the motor is driven using a first drive mode in which the motor is rotated with low noise. When the vehicle brushless motor 10 is rotated at a revolving speed higher than the predetermined revolving speed, and if a determination is made that the temperature of a switching timing arithmetic section 14a (drive control section) has increased during the drive using a second drive mode in which the motor is rotated highly efficiently, resulting in the temperature exceeding a predetermined temperature threshold value T, the motor is driven in the second drive mode regardless of the revolving speed of the brushless motor 10. |
