System For Diagnosing Defects in Electric Motors
First Claim
1. A device for diagnosing bearings in three-phase motors comprising at least one inductive effect probe for the acquisition of common mode currents and a current processing means, comprising a counting means for a number of discharges per unit time.
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Accused Products
Abstract
The invention relates to a device for the diagnosis of flanges in tri-phase motors. More specifically, the invention relates to a device comprising means for the inductive acquisition of currents in a common mode for the simple and practical diagnosis of the defects in the flanges of a tri-phase motor. The invention also relates to a current-measuring device comprising means for capturing currents by inductive methods. The invention further relates to a device and a method for detecting defects in alternating-current electric motors, and more specifically, to a device and a method for obtaining parameters relating to the possible defects in an electric motor, in order to carry out a reliable diagnosis of the defects during the normal operation of the motor.
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Citations
49 Claims
- 1. A device for diagnosing bearings in three-phase motors comprising at least one inductive effect probe for the acquisition of common mode currents and a current processing means, comprising a counting means for a number of discharges per unit time.
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13. A method for diagnosing bearings in three phase motors comprising:
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obtaining a signal relating to a common mode current of a motor; and counting a number of peaks exceeding a predetermined value of current for a predetermined period of time. - View Dependent Claims (14)
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- 15. A device for measuring currents comprising current collection means by inductive methods and conditioning electronics comprising at least one amplifier stage and at least one filter stage, wherein said device lacks an integrator circuit.
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25-29. -29. (canceled)
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30. A method for detecting defects in electric motors for diagnosing defects in motor operation by non-invasive methods, comprising:
- applying self-tuning filters based on the convolution of a wavelet Agnesi function with the supply currents of the electric motor.
- View Dependent Claims (31, 32)
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33. A device for detecting defects in alternating current motors, wherein the device comprises:
- a means for obtaining the signal relating to currents in a stator of an electric motor, a means for obtaining a speed and sliding evolution of the electric motor;
a means for locating at least one fault frequency of the obtained signal;
a means for calculating at least one filter relating to the located fault frequency, by using a wavelet Agnesi function;
a means for convolving the signal obtained with tuned filter banks; and
a means for obtaining a fault factor by an integral of a squared convolution result. - View Dependent Claims (34)
- a means for obtaining the signal relating to currents in a stator of an electric motor, a means for obtaining a speed and sliding evolution of the electric motor;
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35-36. -36. (canceled)
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37. A method for prognosis of a device, comprising:
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measuring a current of the device; and providing a spectral analysis of the measured current. - View Dependent Claims (38, 39, 40)
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41. A method for prognosis of a device, comprising:
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collecting a common mode current signal; transforming the common mode current signal into pulses if the common mode signal exceeds a predetermined amplitude to be detected; and reading the pulses for a predetermined period of time. - View Dependent Claims (42, 43, 44, 45, 46)
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47. A method for detecting defects in alternating current motors comprising:
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obtaining a signal relating to currents in the stator of an electric motor; obtaining a speed and sliding evolution of the electric motor; locating at least one fault frequency of the obtained signal; calculating at least one filter relating to the located fault frequency, by using a wavelet Agnesi function; convolving the signal obtained with tuned filter banks; and obtaining a fault factor by an integral of a squared convolution result. - View Dependent Claims (48, 49)
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Specification