Electricity: measuring and testing – Magnetic – Displacement
Patent
1986-10-27
1988-12-13
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Displacement
324252, G01B 730, G01B 3306
Patent
active
047913665
ABSTRACT:
An apparatus for detecting an angle of rotation is disclosed which comprises a rotary magnet having four poles, two magnetic sensors of a ferromagnetic material disposed over the periphery of the rotary magnet so as to face the magnetic poles of the rotary magnet and to have a phase difference of 3.pi./8 therebetween, a signal generating portion for applying the magnetic sensors of a ferromagnetic material with a first and a second sine-wave signals having a phase difference of .pi./2 in electrical angle therebetween, a synthesizing portion for synthesizing signals output from both of first magnetic sensor of a ferromagnetic material and second magnetic sensor of a ferromagnetic material thereby to output a synthesized signal with a phase difference corresponding to an angle of rotation .theta. from the first sine-wave signal, and a rotational angle detecting portion for detecting the angle of rotation based on the phase difference.
REFERENCES:
patent: 4181884 (1980-01-01), Shirasaki et al.
patent: 4369405 (1983-01-01), Sato et al.
patent: 4466189 (1984-08-01), Tobin
patent: 4490674 (1984-12-01), Ito
patent: 4495464 (1985-01-01), Kozai et al.
Sato Tsutomu
Suzuki Tokio
Alpine Electronics Inc.
Chong Leighton K.
Shoup Guy W.
Strecker Gerard R.
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