Hall effect shaft angle position encoder

Details Hall effect shaft angle position encoder Hall effect shaft angle position encoder

1977-02-25

1978-04-25

Hohauser, Herman J.

Electricity: motive power systems

Switched reluctance motor commutation control

318138, 310 68B, 310DIG3, H02K 2900

Patent

active

040865193

ABSTRACT:
A Hall effect shaft angle position encoder is constructed using a plurality of magnetic elements independent of any magnetic rotor of the electrical device which may be a brushless motor or brushless tachometer. The plurality of magnetic elements has serially alternating polarities of magnetic north and south with at least one Hall effect sensor mounted in spaced and confronting relation with the magnetic elements for sensing the alternating polarities and producing output signals representative of the magnetic polarities where the signals include a ramp voltage passing through zero value. The magnetic elements are secured to the rotor outside the normal rotor elements of the device. The output signals from at least one Hall effect sensor are applied to amplifying means which may be an operational amplifier and through the use of a variable reference voltage varying in magnitude and polarity, the output voltage is shiftable to provide signals differing in phase from the Hall effect sensor output signals in accordance with the variable reference voltage polarity and magnitude.

REFERENCES:
patent: 3903463 (1975-09-01), Kanamori

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