| 摘要 |
PURPOSE: A sensorless detecting circuit for a motor is provided to realize a sine wave current driving of the sensorless motor in low cost. CONSTITUTION: A sensorless detecting circuit for permanent magnet synchronous motor comprises a micro computer(80) for outputting a driving signal to drive the motor, an inverter(20), a current sensor(40) for detecting the current flowing the motor, a voltage sensor(50) for detecting the voltage supplied to the motor, a position calculating unit(60) for achieving the position information by using the current and voltage from the current sensor and voltage sensor, and a photo coupler for transferring the position information to the micro computer(80). The inverter(20) converts the DC voltage output of a rectification unit(10) to three phase voltage by the switching operation of the transistor by the driving signal, and supplies the three phase voltage to the motor(30).
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