Rotation detector

Details Rotation detector Rotation detector

1981-02-06

1986-07-08

Duggan, Donovan F.

Electrical generator or motor structure

Dynamoelectric

Rotary

310155, H02K 2112

Patent

active

045995311

ABSTRACT:
A rotation detector for detecting the rotational speed and phase of the upper rotary drum of a guide drum of a VTR in respect to the stationary drum of the guide drum as the upper rotary drum rotates about its rotational axis, the rotation detector including a magnet mounted on the lower surface of the upper rotary drum along a first circumferential path which is coaxial with the rotational axis of the upper rotary drum, five yoke members mounted along the first circumferential path on the lower surface of the upper rotary drum with the magnet and each yoke member being equally spaced from one another along the first circumferential path, a first iron core having a coil wound about it mounted on the stationary drum along a second circumferential path which is coaxial with and opposing the first circumferential path for producing a signal corresponding to the rotational phase of the upper rotary drum in response to the passing of only the magnet during rotation of the upper rotary drum, and two second iron cores, each having a U-shaped configuration with a first leg including a magnet and a second leg having a coil wound about it, mounted along the second circumferential path of the stationary drum for producing a signal corresponding to the rotational speed of the upper rotary drum in response to the passing of the magnet and five yoke members during rotation of the upper rotary drum.

REFERENCES:
patent: 3688306 (1972-08-01), Oishi et al.
patent: 3728565 (1973-04-01), O'Callaghan
patent: 4061938 (1977-12-01), Hashimoto

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