Low cost redundant resolver system
AssigneeAspen Motion Technologies, Inc.
InventorsMartin Piedl, Moe K. Barani, Ron Flanary
Life of this patent
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Abstract
A resolver (20, 21) is provided with redundant excitation windings in which only a single excitation winding (E1) is energized externally. Cross coupling from the externally energized winding (E1) excites the other excitation winding (E2). A control circuit (27, 28) monitors the excitation of the redundant excitation winding (E2) and switches the excitation to the redundant excitation winding (E2) in the event of a failure of the externally winding (E1).
Claims6
In a resolver having a stator and a rotor, the stator having at least a first excitation winding, and first and second output windings, an improvement which comprises:
- a first excitation driver circuit to drive said first excitation winding;
- a second excitation winding disposed on the stator;
- a second excitation driver circuit to drive said second excitation winding;
- a control circuit for sensing an induced voltage in said second excitation winding induced by the excitation of the first excitation winding;
- and
- wherein said control circuit responds to a lack of induced voltage in the second excitation winding to switch on the second excitation driver circuit.
Dependencies are inferred from the claim text.