Rotational position detection device

Details Rotational position detection device Rotational position detection device

1985-11-19

1988-05-10

Duggan, Donovan F.

Electrical generator or motor structure

Dynamoelectric

Rotary

310168, 310171, H02K 3900

Patent

active

047437863

ABSTRACT:
This rotational position detection device comprises a stator section including primary and secondary windings and a rotor section disposed in such a manner that it is capable of performing relative rotational displacement with respect to the stator section. A conductive substance portion is provided in the form of a predetermined pattern. The amount of flux passing through the conductive substance portion of the rotor section changes in accordance with a relative rotational position of the rotor section with respect to the stator section and therefore an eddy current flows through the conductive substance portion. Reluctance is caused to change by a loss due to this eddy current and a secondary output signal corresponding to the rotational position is produced in the windings of the stator section. The pattern of the conductive substance portion can be formed easily by using electro-plating or other surface processing technique. The rotor section may be of a shape such that the rate of the reluctance change is enhanced by the combination of the magnetic substance portion and the conductive substance portion.

REFERENCES:
patent: 1607287 (1926-11-01), Laffoon
patent: 1642041 (1927-09-01), Nyman
patent: 1773074 (1930-08-01), Borreson
patent: 2796542 (1957-06-01), Bekey et al.
patent: 3281655 (1966-10-01), Blasingame
patent: 3281825 (1966-10-01), Corl et al.
patent: 3486054 (1969-12-01), Livingston
patent: 4121112 (1978-10-01), Hartig
patent: 4405896 (1983-09-01), Akita

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