Methods and systems for diagnosing faults for rotors of electric motors
First Claim
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1. A method for fault diagnosis for a rotor of an electric motor, the electric motor also having an inverter, the method comprising the steps of:
- obtaining a current for the inverter;
determining a preliminary angle using a resolver angle of the rotor;
conducting a transformation of the current using a transformation angle, the transformation angle being equal to a product of the preliminary angle and a multiplier; and
identifying, via a processor, a fault condition using the transformation.
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Abstract
Methods and systems are provided for diagnosing faults of a rotor of an electric motor. A current is obtained for an inverter using a sensor. A preliminary angle is determined by a control unit or processor using a resolver angle of the rotor. A transformation is conducted by the control unit or processor using a transformation angle that is equal to a multiplier multiplied by the preliminary angle. A fault condition is identified via the control unit or processor using the transformation.
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Citations
20 Claims
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1. A method for fault diagnosis for a rotor of an electric motor, the electric motor also having an inverter, the method comprising the steps of:
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obtaining a current for the inverter; determining a preliminary angle using a resolver angle of the rotor; conducting a transformation of the current using a transformation angle, the transformation angle being equal to a product of the preliminary angle and a multiplier; and identifying, via a processor, a fault condition using the transformation. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for fault diagnosis for a rotor of an electric motor, the electric motor also having an inverter, the method comprising the steps of:
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obtaining a current for the inverter; determining a preliminary angle using a resolver angle of the rotor; multiplying the preliminary angle by a first multiplier to generate a first transformation angle; multiplying the preliminary angle by a second multiplier to generate a second transformation angle; conducting a first transformation of the current using the first transformation angle; conducting a second transformation of the current using the second transformation angle; and identifying, via a processor, a fault condition using the first transformation and the second transformation. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A system for use with an electrical system comprising an electric motor having a rotor and a stator, and an inverter module coupled between an energy source and the stator, the inverter module being configured to provide a commanded voltage from the energy source to the stator, the system comprising:
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a current sensor coupled between the energy source and the inverter module, the current sensor being configured to measure an input current for the inverter module; and a control module coupled to the inverter module and the current sensor, the control module being configured to; determine a preliminary angle using a resolver angle of the rotor; conduct a first transformation of the input current using a first transformation angle that is equal to a first multiplier multiplied by the preliminary angle; conduct a second transformation of the input current using a second transformation angle that is equal to a second multiplier multiplied by the preliminary angle; and identify a fault condition using the first transformation and the second transformation. - View Dependent Claims (17, 18, 19, 20)
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Specification