Testing and Analysis Fault of Induction Motor for Case Study Misalignment Installation Using Current Signal with Energy Coefficient
Abstract
:1. Introduction
- Analysis of an electric current signal while the motor is running;
- Analysis of a vibration signal while the motor is running;
- Analysis of a sound signal;
- Analysis of thermal imagery.
2. The Conception and Proposed Methods
2.1. Installation Misalignment Types
2.2. Digital Signal Processing Techniques
2.3. Analysis Technique and Determine Energy Coefficient of Current Signal
3. Research Methods
- The parameters of the three-phase induction motor are 11 kW, 380 V, 50 Hz, and four poles, as shown in Table 1;
- The instrument was used for measuring the eccentricity of the rotor shaft;
- For the motor startup, the control unit is set to the star and delta switch, which reduces the high current during startup;
- The current signal sensors are set with the current type (LEN-HX-10NP), with 1% accuracy, 1% linearity, DC at a 50 kHz frequency bandwidth, 20 A input current Ip, and 4 V output voltage, as shown in Figure 2;
- A fourth-order low-pass filter circuit with a cut-off frequency of 500 Hz is included in the design. Because the motor current signal is incorporated with a high frequency, the high-frequency signal needs to be eliminated using the current circuit filter, as shown in Figure 3;
- The data acquisition card for receiving signal data for analysis is a Micro USB DAQ that inputs and outputs 30 points and operates in both digital and analog input modes;
- Figure 4. shows the circuit that is connected to the equipment for data recording during testing [24].Figure 5a,b shows the setup of the experimental set with a three-phase induction motor and star-delta starting method. Figure 5c,d shows setup the misalignment installation fault provided by the bolt base under motor, which acts on the base under motor and checking with a dial gauge. The adjustable shaft misalignment by the FISSO Ref: LS30.10 with switch magnet (M); overall height: 367 mm; horizontal: 10 mm dia. × 106 mm length; vertical: 12 mm dia. × 156 mm length; base size: 60 mm × 50 mm × 55 mm; holding strength approx. 800 N; weight: 1.660 kg [25];
- The eccentric rotor shaft defect test was carried out as follows. Figure 5a,b shows the test setup for a motor in the no-load mode. A medium motor type was used; therefore, the star-delta starting method was employed to reduce the high current when starting the motor. The low-pass frequency circuit was then detected by sampling at a sampling frequency of 4 kHz, and the current signal was recorded with a DAQ card.
4. Results and Discussion
4.1. Experimental Result at the Normal Condition
Results of Current Signal Detection in the Time and Frequency Domains
4.2. Analysis Results of the Motor Fault from the Eccentric Rotor Shaft
5. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Parameter | Value |
---|---|
Power | 11 kW |
Voltage | 380V |
Ampere | 20A |
Power factor | 0.8 |
Rotor speed | 1450 rpm |
Air gap | 0.5 mm |
Energy Signal | Coefficient |
---|---|
Ea | 52.2548 |
Ed1 | 0.0302 |
Ed2 | 0.2859 |
Ed3 | 9.1370 |
Ed4 | 38.2919 |
Etotal | 100 |
Parameter Energy Coefficient | Motor Normal Condition | Motor Installation Misalignment | |||
---|---|---|---|---|---|
0% | 10% | 20% | 30% | 40% | |
Ea | 52.2548 | 90.4908 | 90.5329 | 89.9976 | 89.6416 |
Ed1 | 0.0303 | 0.0025 | 0.0025 | 0.0020 | 0.0019 |
Ed2 | 0.2859 | 0.1586 | 0.1586 | 0.0927 | 0.1042 |
Ed3 | 9.1370 | 0.27690 | 0.2690 | 0.2637 | 0.3154 |
Ed4 | 38.2919 | 9.1685 | 9.0370 | 9.6441 | 9.9369 |
Etotal | 100 | 100 | 100 | 100 | 100 |
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Prainetr, S.; Tunyasrirut, S.; Wangnipparnto, S. Testing and Analysis Fault of Induction Motor for Case Study Misalignment Installation Using Current Signal with Energy Coefficient. World Electr. Veh. J. 2021, 12, 37. https://doi.org/10.3390/wevj12010037
Prainetr S, Tunyasrirut S, Wangnipparnto S. Testing and Analysis Fault of Induction Motor for Case Study Misalignment Installation Using Current Signal with Energy Coefficient. World Electric Vehicle Journal. 2021; 12(1):37. https://doi.org/10.3390/wevj12010037
Chicago/Turabian StylePrainetr, Supachai, Satean Tunyasrirut, and Santi Wangnipparnto. 2021. "Testing and Analysis Fault of Induction Motor for Case Study Misalignment Installation Using Current Signal with Energy Coefficient" World Electric Vehicle Journal 12, no. 1: 37. https://doi.org/10.3390/wevj12010037