Apparatus for driving a sensorless motor

Details Apparatus for driving a sensorless motor Apparatus for driving a sensorless motor

1996-06-20

1998-02-10

Ro, Bentsu

Electricity: motive power systems

Switched reluctance motor commutation control

318439, 318721, H02P 618

Patent

active

057172994

ABSTRACT:
A brushless sensorless motor driving circuit for driving a motor having a rotatable rotor and a plurality of excitation coils in which a motor starting mode may be smoothly switched to a normal driving mode so as to reduce a fluctuation in a starting time. The sensorless motor driving circuit includes a detection circuit for detecting a generated induction voltage from the excitation coils; a phase-locked loop circuit for generating a clock pulse; a delay pulse generating circuit for generating a delay pulse based on the clock pulse; a switching signal generating circuit for generating conduction switching signals in accordance with the delay pulse and an output signal from the detection circuit for causing an excitation pattern of the excitation coil to be switched to another excitation pattern; and starting pulse inserting circuits for inserting a starting pulse based on the clock pulse in the detection circuit when the induction voltage is not generated.

REFERENCES:
patent: 4874993 (1989-10-01), Tanaka et al.
patent: 5223772 (1993-06-01), Carobolante
patent: 5572097 (1996-11-01), Cameron

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