| CPC H02P 27/085 (2013.01) | 7 Claims |
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1. A motor control device that executes fluctuation suppression control when a power supply voltage for driving a motor supplied from a power supply temporarily decreases and then increases to a normal power supply voltage after recovery, and the fluctuation suppression control suppressing fluctuation in a rotation speed of the motor which is caused by following fluctuation in the power supply voltage, the motor control device comprising:
a detection unit configured to detect that the power supply voltage turns to an increase from a decrease; and
a generation unit configured to generate, in response to the detection unit detecting that the power supply voltage turns to the increase, an applied voltage to be applied to the motor using a predetermined function such that (i) an actual motor rotation speed decreased according to the decrease of the power supply voltage approaches a target motor rotation speed, and (ii) an initial increasing speed of the actual motor rotation speed is moderate, an increasing speed of the actual motor rotation speed gradually increases, and then the increasing speed gradually decreases over time, wherein
the fluctuation suppression control is executed by applying the applied voltage generated by the generation unit to the motor, and
the predetermined function is a transfer function of a first-order lag system including a cutoff frequency that increases more than a proportional relationship over time.
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