Apparatus and calculating method for early warning on health of servo motor
A technology of servo motors and early warning devices, applied in electromechanical devices, emergency protection circuit devices, measuring devices, etc., can solve problems such as lack of adaptability, increased bandwidth, and limited range
Active Publication Date: 2014-12-03
DELTA ELECTRONICS INC
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Problems solved by technology
[0006] 1. In the process of integration, it is easy to erase some information, and it may also cause spectral artifacts due to the energy scattered to the high-frequency part due to integration, blurring the correct frequency and causing errors in interpretation
[0007] 2. When the signal is converted into the frequency domain, the information in the time domain will disappear, that is to say, the time when a specific frequency occurs cannot be determined in the frequency domain, which increases the inconvenience of analyzing the signal
However, since the wavelet transform is modified by the Fourier transform, there are still the disadvantages of energy dispersion, increased bandwidth, and lack of adaptability
Moreover, the appropriate wavelet basis function must be selected before decomposing the signal, and once the basis function is selected, it must be used to analyze all the data, thus limiting the scope of application
Method used
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[0041] Relevant technical content and detailed description of the present invention, cooperate accompanying drawing to illustrate as follows:
[0042] See Figure 1A and Figure 1B , are respectively a schematic diagram of the connection between a servo motor and a servo driver of the present invention and a perspective view of the application of the servo motor to a computer numerical control machine tool. Taking the machine tool application of computer numerical control machine tools as an example, in the case where angular positioning is required, the motor needs an encoder to detect the rotor angle, and then estimate the angular velocity and angular acceleration. In actual operation, sometimes the motor rotor is directly driven, and sometimes it is driven by a coupling. The coupling is more flexible in the direction of the rotor axis (Z direction) to deal with front and rear movement or vibration, while the vibration of the X-Y plane perpendicular to the axis direction wi...
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The invention discloses an apparatus and a calculating method for early warning on health of a servo motor; and the apparatus and the method are applied to estimation on a vibration state of a computer numerical control machine tool. First, a vibration signal is generated by a vibration sensing unit; second, the vibration signal is transmitted sequentially to a data buffer; third, time and frequency domains conversion is carried out on the vibration signal by a time-frequency domain conversion unit; fourth, a deterioration index is calculated by a deterioration index calculation unit and a health index is obtained by a health index calculation unit. Therefore, the utilization of the built-in vibration sensing unit enables installation and wiring for an extra added sensor to be saved; moreover, according to the health index size, the vibration state of operation of the servo motor on the computer numerical control machine tool can be estimated and thus good parses on nonlinear and nonstationary vibration characteristics can be provided.
Description
technical field [0001] The invention relates to a health warning device for a servo motor and a calculation method thereof, and provides a health warning device for a servo motor with time-frequency domain conversion of a vibration signal and a calculation method thereof. Background technique [0002] In recent years, with the improvement of high-efficiency and high-quality production technology, mechanical equipment has been comprehensively developed in the direction of large-scale, rapid, systematic, complex and automated. Also because the scale of equipment in the factory is getting larger and larger, the relevance of each system is getting closer and closer, and the equipment itself is becoming more and more complex. Therefore, if the possible failures cannot be predicted early and the equipment is repaired and maintained, once a failure occurs, the economic loss caused will be very considerable. [0003] Taking the operation of computer numerical control machine tools ...
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IPC IPC(8): H02H7/08H02K11/00G01H17/00H02K11/20H02K11/21
Inventor 蔡清雄林孟璋
Owner DELTA ELECTRONICS INC