Monitoring a Resolver
AssigneeABB Schweiz AG
InventorsRichard Roberts, Werner Hösl
Life of this patent
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Abstract
A resolver comprises a pair of stator windings and a rotor winding that is rotatable with respect to the stator windings and inductively coupled to these. A method for monitoring the resolver comprises exciting the rotor winding with an alternating current having an oscillation frequency and a first phase, obtaining voltages induced in the stator windings by the alternating current flowing in the rotor winding, deciding that the resolver is defective when a shift between phases of a first one of said induced voltages and of the alternating current differs from a nominal phase shift by more than a predetermined phase threshold.
Claims17
A method for monitoring a resolver, the resolver comprising a pair of stator windings and a rotor winding which is rotatable with respect to said stator windings and inductively coupled to these, the method comprising:
- a) exciting the rotor winding with an alternating current having an oscillation frequency and a first phase;
- b) obtaining voltages induced in the stator windings by the alternating current flowing in the rotor winding;
- c) deciding that the resolver is defective when a shift between phases of a first one of said induced voltages and of the alternating current differs from a nominal phase shift by more than a predetermined phase threshold.
A resolver controller comprising a power supply circuit for providing an alternating current having an oscillation frequency and a first phase to a rotor winding of a resolver, and a processor adapted to:
- obtain voltages induced in the stator windings by the alternating current flowing in the rotor;
- and to
- decide that the resolver is defective when a shift between phases of a first one of the induced voltages and of the alternating current differs from a nominal phase shift by more than a predetermined phase threshold.
A tangible computer-readable storage medium having stored thereon a plurality of instructions which, when executed by a processor, cause the processor to:
- obtain voltages induced in the stator windings by an alternating current flowing in the rotor winding;
- and to
- decide that the resolver is defective when a shift between phases of a first one of said induced voltages and of the alternating current differs from a nominal phase shift by more than a predetermined phase threshold.
Dependencies are inferred from the claim text.