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A Method for Extracting Instantaneous Frequency and Instantaneous Envelope of Three-phase Motor Current Signal

An instantaneous frequency and current signal technology, applied in frequency measurement devices, motor generator testing, current/voltage measurement, etc., can solve problems such as failure to utilize multi-channel current information complementarity, to facilitate real-time calculation and avoid instantaneous The effect of frequency calculation error and simple method

Active Publication Date: 2019-07-02
XI AN JIAOTONG UNIV
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Problems solved by technology

Both of these two methods analyze single-channel current signals, and fail to take advantage of the information complementarity between multi-channel currents; in addition, the calculation process of the two methods requires more complex mathematical operations, which are more suitable for offline analysis; In addition, the Hilbert transform is suitable for the analysis of single-component signals, and cannot be directly analyzed for complex signals under real working conditions; wavelet demodulation needs to pre-set the filter frequency band, which is not applicable to the variable speed situation of real working conditions

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  • A Method for Extracting Instantaneous Frequency and Instantaneous Envelope of Three-phase Motor Current Signal
  • A Method for Extracting Instantaneous Frequency and Instantaneous Envelope of Three-phase Motor Current Signal
  • A Method for Extracting Instantaneous Frequency and Instantaneous Envelope of Three-phase Motor Current Signal

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Embodiment Construction

[0037] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0038] refer to figure 1 , a method for extracting instantaneous frequency and instantaneous envelope of a three-phase motor current signal, comprising the following steps:

[0039] 1) Refer to figure 2 , The hardware composition of signal acquisition includes: signal acquisition equipment, current sensor, notebook computer, embodiment selects FLUKE i400s current clamp as current sensor, uses OR35 to carry out signal acquisition, and sampling frequency is set to 6400Hz;

[0040] Install three current sensors on the three-phase current line at the output end of the frequency converter on the power supply side of the machine tool electric spindle, use a four-channel signal acquisition card, set the sampling frequency of the acquisition card, and collect three-phase current signals synchronously, denoted as i U (n), i V (n), i W (n), where n...

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Abstract

The invention discloses a method of extracting the instantaneous frequency and the instantaneous envelope of three-phase motor current signals. synchronously-acquired three-phase current signals are used for constructing analysis signals corresponding to the current signals through current transformation; through calculating the mode and the argument of the analysis signals, the instantaneous envelope and the instantaneous phase are obtained; through a numerical differentiation algorithm, the instantaneous frequency is calculated, and as for a singular point in the instantaneous frequency, a phase unwrapping algorithm is used for processing; and through offline filter processing, a high-frequency component in the instantaneous frequency is removed, and the accurate instantaneous frequency is obtained. Demodulation of the three-phase current signals and extraction of an instantaneous rotation speed are realized, the calculation speed is quicker compared with the traditional method, real-time monitoring on an electromechanical device is facilitated, and an important role is played in fault diagnosis on the motor and a transmission part and operation state acquisition of a mechanical part.

Description

technical field [0001] The invention belongs to the technical field of motor current fault diagnosis method and signal analysis, and in particular relates to a method for extracting instantaneous frequency and instantaneous envelope of a three-phase motor current signal. Background technique [0002] Three-phase motors or electric spindles are widely used in the transmission systems of various industrial machinery to provide sufficient torque and appropriate speed for the entire equipment. The healthy operation of the motor and its driving equipment is of great significance to the normal operation of the whole machine. Motor Current Signature Analysis (MCSA) is an online monitoring and fault diagnosis method for motors and their drive system components. The method obtains the stator current signal of the motor through a current sensor, and analyzes it to judge whether the parts such as the motor and the gearbox are in a normal working state. [0003] The characteristic fre...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/34G01R19/00G01R23/02
CPCG01R19/04G01R23/02G01R31/343
Inventor 徐光华锁霖鲁旭东贺敏琪王振宇
Owner XI AN JIAOTONG UNIV
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