Resolver with leakage flux absorber

Details Resolver with leakage flux absorber Resolver with leakage flux absorber

1997-03-07

2000-09-12

Ramirez, Nestor

Electrical generator or motor structure

Dynamoelectric

Rotary

310160, 310171, 310190, 336 84R, 336120, 323348, H02K 2400

Patent

active

06118201&

ABSTRACT:
A brushless resolver comprising a housing, a rotor rotatably mounted in the housing, a rotary transformer comprising a primary winding carried by the housing and secondary winding on the rotor and operatively associated with the primary winding, a resolver comprising a stator winding carried by the housing and a rotor winding on the rotor and operatively associated with the stator winding, characterized by an electromagnetic flux absorber in the housing between the rotary transformer and the resolver for absorbing leakage electromagnetic flux from the rotary transformer so as to reduce any deviation between the indicated electrical position of the rotor and the actual mechanical position of the rotor during each revolution of the rotor. The flux absorber comprises a copper ring between the rotary transformer primary winding and the resolver stator winding so that the leakage flux creates eddy currents in the ring thereby absorbing or reducing the leakage flux. An additional flux absorber in the form of an element of ferromagnetic material can be r provided between the copper ring and the resolver stator winding to absorb stray components of the leakage flux.

REFERENCES:
patent: Re26501 (1968-12-01), Himmelstein et al.
patent: 3717029 (1973-02-01), Tveter
patent: 4412198 (1983-10-01), Reich
patent: 5191309 (1993-03-01), Laros
patent: 5347256 (1994-09-01), Yumiki et al.
patent: 5705872 (1998-01-01), Loge

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