G - Physics – 01 – P
Patent
G - Physics
01
P
310/42, 306/50,
G01P 3/44 (2006.01) H01H 3/56 (2006.01) H01H 35/10 (2006.01)
Patent
CA 1066381
ABSTRACT OF THE DISCLOSURE 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 mag- netically 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. The latching means has a permanent magnet having a length, height and thickness and is mounted with its height extending in a direction at right angles to the plane of the disc and its thickness extending in a plane parallel to the plane of the disc. A pair of pole pieces are mounted on each side of and engaging the permanent magnet of the latching means, the pole pieces defining the thickness of the permanent magnet. The pole pieces project towards the drag member and terminate in a wedge- shaped, flux concentrating configuration. The drag member has at least three teeth and two of the teeth, which are separated by at least one tooth, are located opposite to and closely spaced from the terminating wedge-shaped ends of the pole pieces. The pole pieces also extend in a direction opposite the wedge-shaped ends and have inwardly directed arms extending towards one another to form a gap between the. A screw is mounted so that it can be advanced into the gap and withdrawn therefrom to provide a finely adjustable magnetic shunt.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.
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