Electricity: motive power systems – Switched reluctance motor commutation control
Patent
1998-06-08
1999-12-07
Ip, Paul
Electricity: motive power systems
Switched reluctance motor commutation control
318138, 318439, H02K 2900
Patent
active
059989467
ABSTRACT:
A method and an apparatus for controlling a rotation of a sensorless and brushless DC motor is disclosed. A switching-driving section provides a driving current to each of pairs of phase coils of the motor in order to rotate a rotor of the motor, and provides a test current to each of pairs of the phase coils in order to detect a present position of the rotor. A back electromotive force detector detects a back electromotive force generated from each of pairs of the driven phase coils during a high-speed rotation of the rotor. Position detecting section detects a test or driving current flowing through each of pairs of the driven phase coils during a low-speed rotation of the rotor, and provides a parallel voltage signal of a digital level. Speed detecting section provides a mode selection signal according to a speed of the rotor in response to the back electromotive force signal detected by the back electromotive force detector. Control section provides a low-speed control signal to the switching-driving section in response to the detected voltage signal below a predetermined speed on the basis of the mode selection signal, and for provides a high-speed control signal to the switching-driving section in response to the detected back electromotive force signal above a predetermined speed on the basis of the mode selection signal. Consequently, although the rotational velocity of the motor varies between low and high velocities, the phase coils are supplied with an optimal driving current at an optimal point in time under the control of the control section, so that the driving characteristics of the motor are improved.
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Daewoo Electronics Co. Ltd.
Ip Paul
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