Spread pole eddy current coupling

Electrical generator or motor structure – Dynamoelectric – Rotary

Patent

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Details

H02K 4902

Patent

active

041386183

ABSTRACT:
The present invention provides an eddy current coupling including an input member, an output member rotatable relative to the input member and an interdigitated pole assembly attached to the output member for rotation therewith. A field coil is provided surrounding a portion of the interdigitated pole assembly and an inductor member is connected to the input member. The field coil when energized establishes a flux field which couples the pole assembly and the inductor member to thereby couple the input member to the output member. The interdigitated pole assembly includes a core portion which is surrounded by the field coil and a plurality of pole members which extend at one end thereof from said core portion and have a pole face at the opposite end thereof with the pole faces of the plurality of pole members extending in opposite directions in an interdigitated fashion. The numerical value of the total surface area of the plurality of pole faces of each of the pole members is equal to between 2.2 and 3 times the numerical value of the area of the core portion to reduce the flux density at the pole faces to enable the coupling to maximize its torque output under low slip conditions.

REFERENCES:
patent: 2465982 (1949-03-01), Winther et al.
patent: 2470596 (1949-05-01), Winther et al.
patent: 2484138 (1949-10-01), Winther
patent: 2606948 (1952-08-01), Jaeschke
patent: 2745974 (1956-05-01), Oetzel

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