Permanent magnet latch for speed switching device

Details Permanent magnet latch for speed switching device Permanent magnet latch for speed switching device

1977-03-04

1978-07-11

Duggan, Donovan F.

Electricity: circuit makers and breakers

Special application

Change of inclination or of rate of motion responsive

200 6139, 310 68E, 310190, H01H 3500

Patent

active

041003829

ABSTRACT:
A speed switch for a motor has an electrically conductive disc which rotates with the rotor of the motor. A drag member adjacent the disc is mounted for limited pivotal movement and has a permanent magnet linked magnetically with the disc to cause electromagnetic interaction resulting in a force on the drag member which varies with the speed of rotation of the disc. A switch is operated by a movement of the drag member to actuate an alarm or to actuate a protective device for the motor. An improved latching means restrains the drag member from movement until a predetermined rotational speed of the disc is reached. A screw is mounted so that it can be advanced into the gap and withdrawn therefrom to provide a finely adjustable magnetic shunt. The adjustment of the shunt varies the magnetic latching force and thereby the speed causing actuation of the switch.

REFERENCES:
patent: 2540845 (1951-02-01), Thomas
patent: 2610993 (1952-09-01), Stark
patent: 2670448 (1954-02-01), Bell et al.
patent: 2825828 (1958-03-01), Ling
patent: 2833879 (1958-05-01), Naul
patent: 3080494 (1963-03-01), Lundin et al.
patent: 4027229 (1977-05-01), Frink
patent: 4054764 (1977-10-01), Whiteley

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