Index signal generating circuit

Details Index signal generating circuit Index signal generating circuit

1999-02-08

2000-12-26

Ro, Bentsu

Electricity: motive power systems

Switched reluctance motor commutation control

318604, 360 7303, H02P 616

Patent

active

061665010

ABSTRACT:
An index signal generating circuit for generating a precise index signal free from time shifting even under ambient temperature changes. An index signal generating circuit includes a magnet attached onto the circumference of the rotor of a spindle motor, a magnetic flux detecting device for detecting magnetic flux of the magnet when the magnet moves past the magnetic flux detecting device, a Hall effect device for switching a current in the driving coil of the spindle motor, a first waveform shaping circuit for shaping the detected output of the magnetic flux detecting device into a rectangular-wave signal, a second waveform shaping circuit for shaping the output of the Hall effect device into a rectangular-wave signal, and a logic circuit for ANDing the output rectangular-wave signals from the first and second waveform shaping circuits, wherein an index signal is generated at the timing of a transition of the AND output of the logic circuit.

REFERENCES:
patent: 4430603 (1984-02-01), Muller
patent: 4501997 (1985-02-01), Muller
patent: 4529918 (1985-07-01), Muller
patent: 4531079 (1985-07-01), Muller
patent: 4651241 (1987-03-01), von der Heide et al.
patent: 5256923 (1993-10-01), Bartos et al.
patent: 5654600 (1997-08-01), Nomura et al.

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