Back-emf brushless d.c. motor drive circuit

Details Back-emf brushless d.c. motor drive circuit Back-emf brushless d.c. motor drive circuit

1985-02-21

1987-03-17

Shoop, Jr., William M.

Electricity: motive power systems

Switched reluctance motor commutation control

318138, 318439, 318721, H02P 602

Patent

active

046510699

ABSTRACT:
The invented circuit energizes the stator windings of a brushless three phase permanent magnet rotor type motor to provide synchronism and optimum torque angle between the stator magnetic field and the rotor field independent of speed and torque thereby giving the motor the running characteristics of a d.c. motor. The circuit compensates for the voltage drop across stator phases due to conductive impedances from the voltage of the respective stator phases. The resultant back-emf voltages are used to generate directly the switching control which energizes the stator currents to flow through the stator phases from phases of highest back-emf to phases of lowest back-emf.

REFERENCES:
patent: 3200315 (1965-08-01), Thompson
patent: 3909690 (1975-09-01), Sugiura
patent: 3959700 (1976-05-01), Sugiura et al.
patent: 4156168 (1979-05-01), Vogel
patent: 4494054 (1985-01-01), Pellegrini

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