MOTOR FAULT DETECTING METHOD AND MOTOR FAULT DETECTING SYSTEM
First Claim
1. A motor fault detecting method for inspecting a health state of a brushless motor, the motor fault detecting method comprising:
- obtaining an electrical frequency of the brushless motor;
obtaining sensing current data of the brushless motor when the brushless motor is operating;
performing an empirical mode decomposition (EMD) of a Hilbert-Huang transform (HHT) on the sensing current data to obtain a plurality of intrinsic mode functions (IMFs);
obtaining a feature IMF from the IMFs, wherein the feature IMF is feature current data, and a frequency of the feature current data complies with the electrical frequency of the brushless motor;
calculating at least one electrical impedance according to an input voltage of the brushless motor and the feature current data; and
comparing the at least one electrical impedance with a reference electrical impedance to determine whether the brushless motor is abnormal, wherein the reference electrical impedance is calculated according to training sensing current data of at least one training brushless motor which is in a healthy state.
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Abstract
A motor fault detecting method and a motor fault detecting system are provided. An electrical frequency and sensing current data of a brushless motor is obtained. An empirical mode decomposition (EMD) is performed on the sensing current data to obtain intrinsic mode functions (IMF). A feature IMF is obtained from the IMFs, in which the feature IMF is feature current data, and a frequency of the feature current data complies with the electrical frequency of the brushless motor. An electrical impedance is calculated according to an input voltage of the brushless motor and the feature current data. The electrical impedance is compared with a reference electrical impedance to determine if the brushless motor is abnormal. The reference electrical impedance is calculated according to training sensing current data of a training brushless motor which is in a healthy state. Accordingly, whether the brushless motor is abnormal is effectively determined.
15 Citations
12 Claims
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1. A motor fault detecting method for inspecting a health state of a brushless motor, the motor fault detecting method comprising:
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obtaining an electrical frequency of the brushless motor; obtaining sensing current data of the brushless motor when the brushless motor is operating; performing an empirical mode decomposition (EMD) of a Hilbert-Huang transform (HHT) on the sensing current data to obtain a plurality of intrinsic mode functions (IMFs); obtaining a feature IMF from the IMFs, wherein the feature IMF is feature current data, and a frequency of the feature current data complies with the electrical frequency of the brushless motor; calculating at least one electrical impedance according to an input voltage of the brushless motor and the feature current data; and comparing the at least one electrical impedance with a reference electrical impedance to determine whether the brushless motor is abnormal, wherein the reference electrical impedance is calculated according to training sensing current data of at least one training brushless motor which is in a healthy state. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A motor fault detecting system, comprising:
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a brushless motor comprising an inverter and a motor; a current sensing unit disposed between the inverter and the motor; and a processor configured to obtain an electrical frequency of the brushless motor, and obtain sensing current data of the brushless motor through the current sensing unit when the brushless motor is operating, and perform an empirical mode decomposition (EMD) of a Hilbert-Huang transform (HHT) on the sensing current data to obtain a plurality of intrinsic mode functions (IMFs), and obtain a feature IMF from the IMFs, wherein the feature IMF is feature current data, and a frequency of the feature current data complies with the electrical frequency of the brushless motor, wherein the processor is configured to calculate at least one electrical impedance according to an input voltage of the brushless motor and the feature current data, and compare the at least one electrical impedance with a reference electrical impedance to determine whether the brushless motor is abnormal, wherein the reference electrical impedance is calculated according to training sensing current data of at least one training brushless motor which is in a healthy state. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification