Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1976-01-22
1977-11-01
Duggan, Donovan F.
Electrical generator or motor structure
Dynamoelectric
Rotary
310168, H02K 2138
Patent
active
040567478
ABSTRACT:
A speed sensor comprises a pick-up device mounted on the aluminum casing of a vehicle transmission, adjacent an existing ferromagnetic gear inside the transmission casing, which gear rotates in unison with the driven wheels of the vehicle. The pick-up device comprises a permanent magnet and a toroidal ferromagnetic core on which an inductive coil is wound. The permanent magnet and toroidal core are cooperatively arranged with respect to the ferromagnetic gear such that a magnetic circuit is created from the permanent magnet through the toroidal core, through the transmission casing, and through the ferromagnetic transmission gear back through the transmission casing to the permanent magnet. As the gear rotates, the reluctance of the magnetic circuit is varied at a rate representative of the speed of the gear and hence the speed of the vehicle. The speed information is provided across the inductive coil. When the pick-up is utilized with a resonant detector circuit, a capacitor connected across the coil forms a resonant circuit whose resonant frequency is modulated by the rotating gear.
REFERENCES:
patent: 2541422 (1951-02-01), Kirkland et al.
patent: 2740110 (1956-03-01), Trimble
patent: 3158033 (1964-11-01), Cohen
patent: 3317765 (1967-05-01), Cone
patent: 3619680 (1971-11-01), Okamoto
patent: 3676765 (1972-07-01), Westcott
patent: 3703946 (1972-11-01), Ondrasik
patent: 3719841 (1973-03-01), Ritsema
patent: 3769533 (1973-10-01), Pauwels
patent: 3912958 (1975-10-01), Steen
patent: 3971995 (1976-07-01), Eikelberger
Miesterfeld Frederick Otto Richard
Orris Stephen Jay
Chrysler Corporation
Duggan Donovan F.
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