CONSTANT-CURRENT DRIVE CIRCUIT, SINE WAVE CURRENT OUTPUT CIRCUIT USING THE SAME, AND MOTOR DRIVE CIRCUIT

摘要

PROBLEM TO BE SOLVED: To accelerate smooth rotation of a motor, and eliminate vibration and noise. ;SOLUTION: A constant-current drive circuit 20 produces and outputs a reference voltage VREF1 which is made by synthesizing with a synthesizer 4, the voltage VREFa for reference that a circuit 10 for making a voltage for reference produces and outputs by full-wave rectification, with a full-wave rectifier D2, the output of an analog sine wave oscillating circuit OSC1 to perform adjustment of a cycle of sine waves by a variable resistor RV and the reference voltage VCHO for current chopping, which is produced and outputted by controlling a sine wave oscillating circuit OSC3 by a capacitor COSC, and the circuit 20 supplies it to a constant current output circuit 30. The output of the constant-current output circuit 30 is the output of a sine wave current output circuit, and this circuit supplies an exciting coil of a motor with a constant current by sine waves and eliminates the step-shape waveform from the sine waves of the exciting currents.;COPYRIGHT: (C)1998,JPO