Digital output rotational position detection device

Details Digital output rotational position detection device Digital output rotational position detection device

1984-10-15

1988-06-28

Karlsen, Ernest F.

Electricity: measuring and testing

Magnetic

Displacement

34087035, G01B 714, G08C 1906

Patent

active

047542209

ABSTRACT:
The present device comprises a stator having a plurality of poles on which primary coils and at least one secondary coil is wound, and a rotor opposing the respective poles of the stator with gaps therebetween. A clock pulse generator is provided, and the respective primary coils are separately excited by reference AC signals which are out of phase with each other and are generated in response to a count of a counter counting a clock pulse signal from the clock pulse generator. The output of the secondary coil or coils provides an output signal resulting by phase shifting the reference AC signals in accordance with the rotational position of the rotor. The phase difference between the reference AC signal and the output signal is detected by obtaining a digital count representing the phase difference in synchronization with the counting by the counter to obtain detected digital phase difference data as an absolute rotational position data.

REFERENCES:
patent: 3281655 (1966-10-01), Blasingame
patent: 3634838 (1972-01-01), Granquist
patent: 4085363 (1978-04-01), Gravina et al.
patent: 4297698 (1981-10-01), Pauweis et al.

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