Patent ID: 6118201
Filing Date: 2000-09-12
Classification: G01D,H01F

Abstract:
A brushless resolver comprising:a) a housing;b) a rotor rotatably mounted in said housing;c) a rotary transformer comprising a first winding carried by said housing and a second winding on said rotor and operatively associated with said first winding;d) means for supplying electrical excitation to said transformer first winding;e) a resolver comprising a stator winding carried by said housing and a rotor winding on said rotor and operatively associated with said stator winding;f) means for obtaining electrical output from said resolver stator winding;g) first means in said housing between said rotary transformer and said resolver for absorbing a principal component of leakage electromagnetic flux from said rotary transformer, said first means comprising an element of material selected to create eddy currents therein when exposed to electromagnetic flux; andh) second means comprising an element of ferromagnetic material in said housing between said first means and said resolver for absorbing an additional component of the leakage electromagnetic flux;i) so that any deviation between the indicated electrical position of said rotor and the actual mechanical position of the rotor during each revolution of said rotor is reduced.