摘要 |
A motor driver capable of detecting the insulation deterioration of a motor easily and inexpensively is disclosed. The voltage supplied from an AC power supply ( 1 ) is rectified by a first rectifying circuit (D 1 to D 6 ) and smoothed by a capacitor (C) in a power supply unit ( 6 ). The output voltage of the power supply unit ( 6 ) is converted into an AC voltage of a frequency and a motor (M) is driven by a motor drive amplifier ( 8 ). Elements (R 1, C 2, R 11, C 21 ) are connected between at least one of the positive electrode ( 4 ) and the negative electrode ( 5 ) of the output line ( 4, 5 ) of the power supply unit ( 6 ) and the ground (G 2, G 4 ). An insulation deterioration circuit ( 10, 11, 12 ) detects at least one of the voltage between the elements and the current flowing through the elements.
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