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US 2018/0294760 A1Published application
Electric motors with neutral voltage sensing
AssigneeHamilton Sundstrand Corporation
InventorsAndreas C. Koenig, Joseph Kenneth Coldwate
Life of this patent
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Abstract
An electrical machine includes a with a parallel first and second phase windings. A first neutral bus is connected to the first phase winding and a second neutral bus is connected to the second phase winding. A first voltage sensor is coupled to the first neutral bus and a second voltage sensor coupled to the second phase winding for monitoring current imbalance between the first and second phase windings.
Claims20
An electrical machine, comprising:
- a stator with first and second phase windings in parallel;
- a first neutral bus connected to the first phase winding;
- a second neutral bus connected to the second phase winding;
- and
- a first sensor lead coupled to the first neutral bus and a second sensor lead coupled to the neutral winding configured to allow monitoring current imbalance between the first and second phase windings.
2 more elements
A method of monitoring current imbalance in an electrical machine, comprising:
- applying current to first and second phase windings arranged electrically in parallel in a stator;
- sensing voltage in a first neutral bus connected to the first winding;
- sensing voltage in a second neutral bus connected to the second winding;
- comparing voltage sensed in the first neutral bus with voltage sensed in the second neutral bus;
- and
- determining current imbalance between current flowing through the first and second windings.
3 more elements
Dependencies are inferred from the claim text.