Electronic control system for a brushless electric motor

Details Electronic control system for a brushless electric motor Electronic control system for a brushless electric motor

1996-07-10

1998-06-16

Ip, Paul

Electricity: motive power systems

Switched reluctance motor commutation control

318138, 318245, 318439, 318560, H02P 602

Patent

active

057676399

ABSTRACT:
A control system for a three phase brushless motor suitable for use in a three and a half inch flexible magnetic disk drive. The control system needs but one Hall effect sensor for providing a rotor position signal indicative of the angular position of the rotor relative to stator windings. Comparators compare the rotor position signal with reference voltages and provide moment signals indicative of the moments the rotor position signal crosses the reference voltage levels. Three phase motor excitation control signals are produced by counters which count clock pulses for preset periods in response to the moment signals. Motor speed is controlled on the basis of not only the actual motor speed but also the phase difference between the clock pulses and a signal indicative of the moments the rotor position signal crosses zero.

REFERENCES:
patent: 4227138 (1980-10-01), Espelage et al.
patent: 4541041 (1985-09-01), Park et al.
patent: 5099186 (1992-03-01), Rippel et al.

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