Compact transformer and method of assembling same

Details Compact transformer and method of assembling same Compact transformer and method of assembling same

1992-10-30

1995-06-13

Hoff, Marc S.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific circuit breaker or control structure

361 93, H02B 108, H01F 4102

Patent

active

054248990

ABSTRACT:
The present invention provides a compact transformer with a magnetic core having at least two leg members and two side members. Each leg member has two ends and a peripheral surface therebetween. Each side member has a generally planar body with at least two notches corresponding in cross-sectional shape and size to the end of each leg member. The sides of each notch surround and abut a majority of the peripheral surface near each leg member end. The leg member end is secured to each notch. A magnetically coupled primary and secondary winding is arranged around each leg member. The transformer is particularly useful in sending current signals to an electronic trip unit of a circuit interrupter.
The invention also includes a method of assembling a transformer which includes the steps of providing a magnetic core having at least two leg members with two ends and a peripheral surface therebetween and providing two side members of approximately the same shape having a generally planar body with at least two notches corresponding in cross-sectional shape and size to the end of each leg member. The method includes pressing and securing the peripheral surface near the end of each leg member against the sides of each notch so that the sides of each notch surround and abut a majority of the peripheral surface near each leg member end.

REFERENCES:
patent: 4668930 (1987-05-01), Francis
patent: 4884048 (1989-11-01), Castonguay
patent: 4897916 (1990-02-01), Blackburn

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