MOTOR PARALLEL WINDING DIFFERENTIAL CURRENT PROTECTION
First Claim
1. An electric motor control system, comprising:
- an electric motor having a phase lead operable to carry a combined phase current and a first winding set including first and second windings connected to the phase lead, the second winding connected in parallel with the first winding, the first and second windings operable to carry a first current and a second current respectively, based on the combined phase current;
a differential current sensor operably coupled to the first winding and the second winding, the differential current sensor measuring a differential current based on the first current and the second current flowing through the first winding and the second winding and operable to transmit a signal indicative of the differential current based on the measuring; and
a motor controller connected to the electric motor, the motor controller configured to;
control the combined phase current through the phase lead;
receive the signal indicative of the differential current from the differential current sensor;
determine if the differential current flowing through the first winding and the second winding exceeds a selected threshold; and
identify a health status of the motor winding set as degraded or faulted if the differential current exceeds the selected threshold.
1 Assignment
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Accused Products
Abstract
An electric motor control system, including an electric motor having a first winding set including first and second parallel windings, the first and second windings operable to each current based on the combined phase current, and a differential current sensor operably coupled to the first winding and the second winding. The differential current sensor measuring a differential current flowing through the first winding and the second winding and operable to transmit a signal indicative of the differential current based on the measuring. The system also includes a motor controller connected to the electric motor, the motor controller operable to direct the combined phase current through the phase lead, receive the differential current signal, determine if the differential current flowing through the winding set exceeds a selected threshold, and identify a health status of the motor winding set as degraded if the differential current exceeds the selected threshold.
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Citations
24 Claims
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1. An electric motor control system, comprising:
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an electric motor having a phase lead operable to carry a combined phase current and a first winding set including first and second windings connected to the phase lead, the second winding connected in parallel with the first winding, the first and second windings operable to carry a first current and a second current respectively, based on the combined phase current; a differential current sensor operably coupled to the first winding and the second winding, the differential current sensor measuring a differential current based on the first current and the second current flowing through the first winding and the second winding and operable to transmit a signal indicative of the differential current based on the measuring; and a motor controller connected to the electric motor, the motor controller configured to; control the combined phase current through the phase lead; receive the signal indicative of the differential current from the differential current sensor; determine if the differential current flowing through the first winding and the second winding exceeds a selected threshold; and identify a health status of the motor winding set as degraded or faulted if the differential current exceeds the selected threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An electric motor, comprising:
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an electric motor having a phase lead operable to carry a combined phase current and a first winding set including first and second windings connected to the phase lead, the second winding connected in parallel with the first winding, the first and second windings operable to carry a first current and a second current respectively, based on the combined phase current; a differential current sensor operably coupled to the first winding and the second winding, the differential current sensor measuring a differential current based on the first current and the second current flowing through the first winding and the second winding and operable to transmit a signal indicative of the differential current based on the measuring. - View Dependent Claims (13, 14, 15, 16)
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17. A method operating an electric machine having a parallel winding set, comprising:
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controlling, by a motor controller, a combined current and directing a first current through a first winding and a second current through a second winding of the parallel winding set, the first current and the second current based on the combined current; sensing a differential current flow between the first current in the first winding and the second current in the second winding of the parallel winding set; determining if the differential current exceeds a first selected threshold; identifying the health status of the electric machine as degraded or failed if the differential current exceeds the first selected threshold. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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Specification