MOTOR PHASE WINDING FAULT DETECTION METHOD AND APPARATUS
First Claim
1. A method of detecting a phase winding fault in a multi-phase electric machine, the method comprising:
- measuring a set of feedback signals of the electric machine, including a phase current for each phase thereof;
generating reference phase voltages for each phase using a controller;
calculating a predetermined voltage value using the feedback signals and each of the reference phase voltages;
comparing the predetermined voltage value to a calibrated threshold to determine the presence of the phase winding fault; and
executing a control action when the predetermined voltage value exceeds the calibrated threshold;
wherein the predetermined voltage value is at least one of;
a ratio (F) of a normalized zero sequence voltage (V0—
norm) to a modulation index (Mi), a root mean square (RMS) voltage (Vrms) for each phase, and a total harmonic distortion (THD) of each of the phase currents.
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Abstract
A method of detecting a phase winding fault in a multi-phase electric machine is executable via a motor controller, and includes measuring feedback signals of the machine, including each phase current, and generating reference phase voltages for each phase. The method includes calculating a predetermined voltage value using the feedback signals and reference phase voltages, and comparing the voltage value to a corresponding threshold to determine the fault. A control action is executed when the voltage value exceeds the corresponding threshold. The voltage value is one or more of: a ratio of a normalized zero sequence voltage to a modulation index, an RMS voltage for each phase, and total harmonic distortion of each phase current. An apparatus detects the fault, and includes a motor controller and an algorithm as set forth above. The apparatus may include a voltage inverter for generating a multi-phase alternating current output for powering the machine.
27 Citations
18 Claims
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1. A method of detecting a phase winding fault in a multi-phase electric machine, the method comprising:
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measuring a set of feedback signals of the electric machine, including a phase current for each phase thereof; generating reference phase voltages for each phase using a controller; calculating a predetermined voltage value using the feedback signals and each of the reference phase voltages; comparing the predetermined voltage value to a calibrated threshold to determine the presence of the phase winding fault; and executing a control action when the predetermined voltage value exceeds the calibrated threshold; wherein the predetermined voltage value is at least one of;
a ratio (F) of a normalized zero sequence voltage (V0— norm) to a modulation index (Mi), a root mean square (RMS) voltage (Vrms) for each phase, and a total harmonic distortion (THD) of each of the phase currents. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of detecting a phase winding fault in a three-phase electric motor, the method being executable via a motor controller adapted for controlling the electric motor, and comprising:
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measuring a set of feedback signals of the electric motor, including at least a corresponding phase current for each of the three phases of the electric motor; generating reference phase voltages for each of the three phases using the motor controller; calculating a predetermined voltage value using the feedback signals and the reference phase voltages; comparing the predetermined voltage value to a calibrated threshold to determine the presence of the predetermined phase winding fault; and setting a diagnostic code using the motor controller when the predetermined voltage value exceeds the calibrated threshold; wherein the predetermined voltage value is each of;
a ratio (F) of a normalized zero sequence voltage (V0— norm) to a modulation index (Mi), a root mean square (RMS) voltage (Vrms) for each phase, and a total harmonic distortion (THD) of each of the phase currents. - View Dependent Claims (8, 9, 10, 11, 12)
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13. An apparatus for detecting a predetermined phase winding fault in a multi-phase electric machine, comprising:
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a motor controller in electrical communication with the electric machine, and adapted for measuring a set of feedback signals of the electric machine, including at least a corresponding phase current for each phase thereof; and an algorithm executable by the motor controller, and adapted for; generating reference phase voltages for each phase of the electric machine using the motor controller; calculating at least one predetermined voltage value using the feedback signals and reference phase voltages; comparing the predetermined voltage value to a calibrated threshold to determine the presence of the predetermined phase winding fault; and executing a control action via the motor controller when the predetermined voltage value exceeds the calibrated threshold; wherein the at least one predetermined voltage value is at least one of;
a ratio (F) of a normalized zero sequence voltage (V0— norm) to a modulation index (Mi), an RMS voltage (Vrms) for each phase, and a total harmonic distortion (THD) of each of the phase currents. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification