US 7,256,701 B2 · Motor driver

Abstract

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 (D1 to D6) 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 (R1, C2, R11, C21) 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 (G2, G4). An insulation deterioration circuit (10, 11, 12) detects at least one of the voltage between the elements and the current flowing through the elements.

Claims22

Dependent claims

A motor driver comprising:

a power supply unit including a first rectifying circuit rectifying the voltage supplied from an AC power supply and a capacitor smoothing the rectified voltage, and a motor drive amplifier driving a motor by converting the output voltage of the power supply unit into an AC voltage of a frequency to drive the motor;
a plurality of elements each being configured of a capacitor and a resistor connected in series with each other, and being connected between at least one of the positive electrode and the negative electrode of the output line of the power supply unit and the ground;
and
an insulation deterioration detecting circuit having a voltage detecting circuit detecting the voltage across the resistor and detecting at least one of the voltage between the elements and the current flowing in the elements.

1 more element

Dependencies are inferred from the claim text.

Motor driver

Life of this patent

Motor driver

Life of this patent

Abstract

Claims22