Motor control device

Abstract

This technology provides a way to drive a motor stably without requiring complex calculations. [Solution] A motor control device that controls the operation of at least one motor in the device comprises a speed control unit that generates a current command value to control the rotational speed of the motor, and a limiter unit that outputs a limit value to prevent the current command value from exceeding a threshold.

Claims

1. A motor control device that controls the operation of at least one motor provided in the device, A speed control unit that generates a current command value to control the rotational speed of the motor, The system includes a limiter unit that outputs a limiting value that prevents the current command value from exceeding a threshold value. Motor control device.

2. The system further includes a speed acquisition unit that acquires the rotational speed of the motor, The limiter section is, Based on the rotational speed of the motor output by the speed acquisition unit, it is determined whether the motor is in an accelerating state, a decelerating state, or a steady state. When the motor is in the acceleration state or the deceleration state, the threshold value is changed using the first value. The motor control device according to claim 1.

3. The acceleration operation of the motor in the aforementioned acceleration state includes a plurality of acceleration sections, The limiter unit changes the first value according to the acceleration rate set for each of the plurality of acceleration sections. The motor control device according to claim 2.

4. The aforementioned device comprises multiple motors, The limiter unit changes the threshold value set for each of the plurality of motors by a first value which is different for each of the plurality of motors. The motor control device according to claim 2 or 3.

5. The aforementioned device is Power supply and Inverter and The system further comprises a voltage detection unit that detects the input voltage supplied from the power supply to the inverter, The limiter section is, Determine whether the detected value of the input voltage deviates from the reference range. If the detected value of the input voltage deviates from the reference range, the threshold value is changed using the second value. The motor control device according to claim 1.

6. The limiter unit changes the second value according to the degree of deviation when the detected value of the input voltage deviates from the reference range. The motor control device according to claim 5.

7. The aforementioned device comprises multiple motors, The limiter unit changes the threshold value set for each of the plurality of motors by a second value which is different for each of the plurality of motors. The motor control device according to claim 5 or 6.

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