Driving curcuit for sensorless brushless motor

Electricity: motive power systems – Switched reluctance motor commutation control

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318439, 318805, 318806, H02K 2300

Patent

active

058776028

ABSTRACT:
A sensorless brushless motor driving circuit for a motor having three phases includes a position detecting circuit for detecting the position of the rotor from the terminal voltages of the motor, a commutation switching circuit for generating commutation switching signals based on a position signal from the position detecting circuit, a motor driving transistor circuit for supplying a motor driving currents to the motor in response to driving signals, a buffer circuit for supplying the driving signals according to the commutation switching signals, and a neutral feedback amplifier for detecting a neutral potential of terminal voltages of the motor, comparing the neutral potential with a reference voltage, outputting a first output to the buffer circuit when the neutral potential of the terminal voltages of the motor is higher than the reference voltage and outputting a second output to the buffer circuit when the neutral potential of the terminal voltages of the motor is lower than the reference voltage.

REFERENCES:
patent: 5182499 (1993-01-01), Inaji et al.
patent: 5196771 (1993-03-01), Naito
patent: 5327053 (1994-07-01), Mann et al.
patent: 5374880 (1994-12-01), Kondoh et al.
Inoue et al., "An Advanced DC Brushless Servo Drive System With A Fuzzy Logic-Based Self-Tuning Control Scheme And Its Practical Evaluations", Int. J. Electronics. vol. 80, No. 2, 1996, pp. 223-233.

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