Motor driving device

A motor driving device, comprising:

• a PWM duty generator, generating a PWM duty value based on a torque command signal according to a speed command signal;
• a PWM signal generator, generating a PWM signal based on the generated PWM duty value;
• a motor driving unit, to which a power supply voltage is supplied, and a drive signal is generated based on the generated PWM signal and supplied to a motor;
• a power supply voltage sudden fluctuation detector, detecting a sudden fluctuation in a rising direction of the power supply voltage;
• a power supply voltage fluctuation amplitude generator, detecting a fluctuation amplitude of the power supply voltage;
• and
• a power supply voltage fluctuation amplitude/PWM duty correction amplitude converter, converting the fluctuation amplitude of the detected power supply voltage into a PWM duty correction amplitude, wherein
• the PWM duty generator includes:
• a command torque/PWM duty converter, converting a command torque indicated by the torque command signal into the PWM duty value;
• a PWM duty output unit, correcting the converted PWM duty value by lowering the converted PWM duty value according to the PWM duty correction amplitude when the sudden fluctuation is detected by the power supply voltage sudden fluctuation detection unit.