| 摘要 |
A motor speed, duty, and power source voltage are detected (steps S 1 to S 3 ). Referring to a load point map, a load point value is obtained (steps S 4 and S 5 ). The load point map is created with the motor speed, duty, and power source voltage taken as parameters, and is corrected in accordance with atmospheric temperature of the motor. After the load point value is obtained, the value is accumulated (step S 6 ). The accumulated point value and a predetermined threshold value are compared with each other (step S 7 ). If the accumulated point value exceeds the threshold value, an overloaded state is determined and the accumulated point value is stored (step S 8 ). Thereafter, the motor is stopped.
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