Thermal protector for electric motors

Details Thermal protector for electric motors Thermal protector for electric motors

1997-07-01

1999-12-21

Picard, Leo P.

Electricity: electrothermally or thermally actuated switches

Thermally actuated switches

With bimetallic element

337360, 337380, 337368, H01H 3712, H01H 3704, H01H 3746

Patent

active

060054719

ABSTRACT:
A thermal protector includes a header plate and a metal housing having an open end hermetically welded to an peripheral edge of the header plate. The housing is formed into a generally slender shape so as to be suited for mounting on end turns of a stator winding of a three-phase electric motor. A thermally responsive element includes a shallow curved portion at which the element changes states of curvature with snap action in response to different ambient temperatures. The thermally responsive element has two movable contacts secured to it to be disposed symmetrically about a center of the curved portion so that the movable contacts are engageable with and disengageable from fixed contacts respectively. A push piece is disposed in the housing to exert a pushing force on a normally convex side of the thermally responsive element. The pushing force is adjusted by deforming the outer surface portion of the housing for calibration of the operating temperature. The push piece includes a portion secured to an inner surface of the housing so as to correspond substantially to the deformed outer surface portion of the housing for calibration of the operating temperature.

REFERENCES:
patent: 4167721 (1979-09-01), Senor et al.
patent: 4517541 (1985-05-01), Ubukata et al.
patent: 4620175 (1986-10-01), Karr et al.
patent: 4843363 (1989-06-01), Ubukata et al.
patent: 4866408 (1989-09-01), Petraitis et al.
patent: 5015985 (1991-05-01), Ubukata et al.
patent: 5121095 (1992-06-01), Ubukata et al.
patent: 5212465 (1993-05-01), Mizutani et al.

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