Rotation detecting device with magnet brake

Details Rotation detecting device with magnet brake Rotation detecting device with magnet brake

1990-10-11

1996-08-06

Beha, Jr., William H.

Electrical generator or motor structure

Dynamoelectric

Rotary

188164, 310 75D, 310156, 324174, H02K 4910, H02K 712, F16F 1503, G01P 346

Patent

active

055436722

ABSTRACT:
A rotation detecting device for vehicle speedometers includes a housing, a magnetic induction device, and a magnetized rotor near the magnetic induction device. The rotor is connected through a coupling to a rotation source. A braking device forms a magnetic circuit between one end surface of the rotor and the housing, and brings the rotor into pressure contact with the housing by a magnetic attraction force generated in the magnetic circuit. Accordingly, a stable and proper braking torque can be applied against rotor vibration, to prevent a false output signal while idling. Furthermore, the amount of wear of a bearing for rotatably supporting a rotating shaft of the rotor can be reduced to improve durability of the rotation detecting device by reducing the braking torque during high-speed rotation of the rotor.

REFERENCES:
patent: 3403276 (1968-09-01), Baker, Jr.
patent: 3619676 (1971-11-01), Kawakami
patent: 3784913 (1974-01-01), Maass
patent: 3790889 (1974-02-01), Mincuzzi
patent: 4646042 (1987-02-01), Eshelman
patent: 4844220 (1989-07-01), Maji et al.
patent: 4885489 (1989-12-01), Stuhr

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