Closed loop control of a brushless DC motor at nominal speed

Details Closed loop control of a brushless DC motor at nominal speed Closed loop control of a brushless DC motor at nominal speed

1992-11-09

1993-09-14

Shoop, Jr., William M.

Electricity: motive power systems

Switched reluctance motor commutation control

318138, 318439, 388815, 3889281, H02K 2300

Patent

active

052452565

ABSTRACT:
A brushless DC motor control apparatus and method for regulating the speed of a motor at a nominal speed. The apparatus maintains a nominal motor speed without the use of conventional rotor position location devices such as Hall sensors. The current speed of the motor is determined using the back EMF zero-crossing measured only on complete rotor revolutions to mitigate motor dissymmetry errors. A control system compares the current speed to a desired speed and adjusts the total motor current to attain the desired speed. As a result, highly accurate speed control is maintained.

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patent: 5028852 (1991-07-01), Dunfield
patent: 5117165 (1992-05-01), Cassat et al.

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