Rotation position detecting device and motor device

Details Rotation position detecting device and motor device Rotation position detecting device and motor device

1996-06-07

1998-08-18

Cabeca, John W.

Electricity: motive power systems

Positional servo systems

Frequency- or phase-modulated systems

318611, 318623, 318652, 318809, 388812, G05B 102

Patent

active

057962316

ABSTRACT:
A rotation position detecting circuit for a sensor-less motor and a motor device include a motor (1) which is rotated and driven by adding a sensor signal having a high frequency to a sine wave drive signal and cosine wave drive signal through adders (5S) and (5C), respectively. Further, a sensor signal is extracted and demodulated from a signal flowing in the motor (1) by a band pass filer (9), and this is defined as a rotation position detection signal. In the sensor signal from the band pass filter (9), its current value is changed corresponding to a change of an impedance resulting from a rotation of a magnet of the motor. As a result, it is possible to detect the rotation position of a rotor magnet by detecting the change of the current value.

REFERENCES:
patent: 4952860 (1990-08-01), Soeda
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patent: 5378976 (1995-01-01), Inaji et al.
patent: 5399952 (1995-03-01), Alem et al.
patent: 5493188 (1996-02-01), Yoshikawa et al.
patent: 5565722 (1996-10-01), Rubner et al.
patent: 5565752 (1996-10-01), Jansen et al.

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