Electricity: motive power systems – Switched reluctance motor commutation control
Patent
1991-05-28
1992-07-28
Ro, Bentsu
Electricity: motive power systems
Switched reluctance motor commutation control
318138, 318439, H02P 602
Patent
active
051343495
ABSTRACT:
Control circuits for operating a two-phase brushless dc motor from a a dc power source are described. Control of the motor is optimized by detecting induced back EMF of the two phases to sense rotor phase position. It is common knowledge that the voltage developed across the terminals of a permanent magnet motor can be represented by a winding resistance, a winding inductance and a generated back EMF. In two-phase brushless dc and permanent magnet stepping motors, the induced back EMFs of the two phases are displaced from each other by 90 electrical degrees. Thus, by detecting the back EMFs of the two phases, an accurate relative position of rotor-to-stator can be determined at any rotor position. Commutation of the motor phases and closed loop control of the motor and load is achieved by accurately sensing the back EMFs of the two phases. Also, phase position of the permanent magnet rotor plates is detected by integrating the sensed back EMFs of the two phases to produce quadrature sinewaves the magnitudes of which are constant relative to rotor speed.
REFERENCES:
patent: 4387326 (1983-06-01), Ray et al.
patent: 4584506 (1986-04-01), Kaszmann
patent: 4612486 (1986-09-01), Ban et al.
patent: 4928046 (1990-05-01), Karasawa
Ro Bentsu
Weber Jr. G. Donald
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