METHODS AND SYSTEMS FOR DIAGNOSING STATOR WINDINGS IN AN ELECTRIC MOTOR
First Claim
1. A method for identifying a fault condition in stator windings in an electric motor, the method comprising:
- applying a first signal at a first electrical angle to the stator windings;
measuring a second signal from the stator windings in response to the first signal;
determining a measured response for the electric motor at the first electrical angle based on the second signal;
obtaining a nominal response for the electric motor at the first electrical angle; and
identifying the fault condition when a magnitude of the difference between the measured response and the nominal response is greater than a threshold value.
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Accused Products
Abstract
Systems and methods are provided for identifying a fault condition in stator windings in an electric motor. A method comprises applying a first signal at a first electrical angle to the stator windings and measuring a second signal from the stator windings in response to the first signal. The method further comprises determining a measured response for the electric motor at the first electrical angle based on the second signal and obtaining a nominal response for the electric motor at the first electrical angle. A fault condition is identified when a magnitude of the difference between the measured response and the nominal response is greater than a threshold value.
55 Citations
20 Claims
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1. A method for identifying a fault condition in stator windings in an electric motor, the method comprising:
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applying a first signal at a first electrical angle to the stator windings; measuring a second signal from the stator windings in response to the first signal; determining a measured response for the electric motor at the first electrical angle based on the second signal; obtaining a nominal response for the electric motor at the first electrical angle; and identifying the fault condition when a magnitude of the difference between the measured response and the nominal response is greater than a threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for diagnosing an electric motor, the electric motor comprising stator windings, the method comprising:
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applying an injection signal at an injection angle to the stator windings; determining a measured response for the electric motor at the injection angle in response to the injection signal, the measured response being influenced by an impedance of the electric motor at the injection angle; and identifying a fault condition when a difference between the measured response and a nominal response for the electric motor at the injection angle is greater than a threshold value. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. An electrical system for use in a vehicle, the electrical system comprising:
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an electric motor having a set of stator windings and a rotor; an energy source; an inverter module coupled between the energy source and the set of stator windings; a current sensor coupled between the inverter module and the set of stator windings, the current sensor being configured to measure current through the set of stator windings; and a control module coupled to the inverter module and the current sensor, the control module being configured to; operate the inverter module to apply an injection voltage signal at an injection angle to the set of stator windings; determine a measured response value for the injection angle based on a measured current from the current sensor; obtain a nominal response value for the electric motor at the injection angle; and identify a fault condition when a difference between the measured response value and the nominal response value is greater than a threshold value. - View Dependent Claims (19, 20)
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Specification