System and method of integrated vibration monitoring in motor drives
First Claim
1. A method for monitoring vibration in a motor connected to a motor drive, the method comprising the steps of:
- receiving a reference signal at a controller in the motor drive, wherein the reference signal corresponds to a desired operation of the motor connected to the motor drive;
receiving a feedback signal at the controller from a position feedback device operatively connected to the motor;
generating a torque reference signal with the controller, wherein the torque reference signal is a function of the reference signal and of the feedback signal;
determining an estimated torque signal in a condition monitor module executing on the controller, wherein the estimated torque signal is a function of the feedback signal and of the torque reference signal;
generating a frequency response of the estimated torque signal with the controller, wherein the frequency response includes a plurality of frequencies and a plurality of magnitudes identified within the estimated torque signal and wherein each magnitude in the plurality of magnitudes corresponds to one frequency in the plurality of frequencies;
reading at least one frequency and at least one threshold into the controller from a memory device in the motor drive, wherein the memory device includes non-transitory memory and each of the at least one thresholds corresponds to one of the at least one frequencies;
setting a status flag on the motor drive when the magnitude of the frequency in the frequency response is greater than the threshold of the corresponding frequency stored in the non-transitory memory; and
resetting the status flag on the motor drive when the magnitude of the frequency in the frequency response is less than the threshold of the corresponding frequency stored in the non-transitory memory.
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Abstract
An improved system and method for analyzing motor performance to detect vibration of an electric machine controlled by a motor drive is disclosed. A load observer determines an estimated torque present as a load on the motor as a function of input signals corresponding to a desired torque to be generated by the motor and to a measured angular position of the motor during operation. The motor drive determines a frequency response of the estimated torque to identify at what magnitude and frequency any vibration components are present within the estimated torque signal. The motor drive compares the frequency response of the estimated torque signal to set points. If the measured magnitude of vibration at a particular frequency, as seen in the frequency response, exceeds a threshold set in one of the set points for that frequency, the motor drive generates an output signal indicating an excessive vibration is present.
7 Citations
20 Claims
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1. A method for monitoring vibration in a motor connected to a motor drive, the method comprising the steps of:
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receiving a reference signal at a controller in the motor drive, wherein the reference signal corresponds to a desired operation of the motor connected to the motor drive; receiving a feedback signal at the controller from a position feedback device operatively connected to the motor; generating a torque reference signal with the controller, wherein the torque reference signal is a function of the reference signal and of the feedback signal; determining an estimated torque signal in a condition monitor module executing on the controller, wherein the estimated torque signal is a function of the feedback signal and of the torque reference signal; generating a frequency response of the estimated torque signal with the controller, wherein the frequency response includes a plurality of frequencies and a plurality of magnitudes identified within the estimated torque signal and wherein each magnitude in the plurality of magnitudes corresponds to one frequency in the plurality of frequencies; reading at least one frequency and at least one threshold into the controller from a memory device in the motor drive, wherein the memory device includes non-transitory memory and each of the at least one thresholds corresponds to one of the at least one frequencies; setting a status flag on the motor drive when the magnitude of the frequency in the frequency response is greater than the threshold of the corresponding frequency stored in the non-transitory memory; and resetting the status flag on the motor drive when the magnitude of the frequency in the frequency response is less than the threshold of the corresponding frequency stored in the non-transitory memory. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A motor drive operative to determine a vibration in a motor connected to the motor drive, the motor drive comprising:
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a first input configured to receive a reference signal corresponding to a desired operation of the motor connected to the motor drive; a second input configured to receive a feedback signal from a position feedback device operatively connected to the motor; a memory device configured to store a plurality of instructions, wherein the memory device includes non-transitory memory; and a controller configured to execute the plurality of instructions to; generate a torque reference signal as a function of the reference signal and of the feedback signal, determine an estimated torque signal as a function of the feedback signal and of the torque reference signal; generate a frequency response of the estimated torque signal, wherein the frequency response includes a plurality of frequencies and a plurality of magnitudes identified within the estimated torque signal and wherein each magnitude in the plurality of magnitudes corresponds to one frequency in the plurality of frequencies; read at least one frequency and at least one threshold from the non-transitory memory, wherein each of the at least one thresholds corresponds to one of the at least one frequencies; set a status flag on the motor drive when the magnitude of the frequency in the frequency response is greater than the threshold of the corresponding frequency stored in the non-transitory memory; and reset the status flag on the motor drive when the magnitude of the frequency in the frequency response is less than the threshold of the corresponding frequency stored in the non-transitory memory. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method for monitoring vibration in a motor connected to a motor drive, the method comprising the steps of:
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determining an estimated torque present at an output of the motor using a controller executing in the motor drive; generating a frequency response of the estimated torque using the controller executing in the motor drive, wherein the frequency response includes a plurality of frequencies and a plurality of magnitudes identified within the estimated torque and wherein each magnitude in the plurality of magnitudes corresponds to one frequency in the plurality of frequencies; reading at least one frequency and at least one threshold into the controller from a memory device in the motor drive, wherein the memory device includes non-transitory memory and each of the at least one thresholds corresponds to one of the at least one frequencies; setting a status flag on the motor drive when the magnitude of the frequency in the frequency response is greater than the threshold of the corresponding frequency stored in the non-transitory memory; and resetting the status flag on the motor drive when the magnitude of the frequency in the frequency response is less than the threshold of the corresponding frequency stored in the non-transitory memory. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification