Vibration and Noise Optimization of Variable-Frequency-Driven SPMSM Used in Compressor Based on Electromagnetic Analysis and Modal Characteristics
Abstract
:1. Introduction
2. Research on Air-Gap Magnetic Field of SPMSM Powered by Frequency Converter
2.1. Analytical Analysis of Air-Gap Magnetic Field Driven by Frequency Conversion
2.2. Simulation Verification of Air-Gap Flux Density Driven by Frequency Conversion
3. Research on Electromagnetic Excitation Force of PMSM Powered by Frequency Converter
3.1. Analysis of Frequency Characteristics of High-Frequency Electromagnetic Force
3.2. Simulation and Verification of Frequency Characteristics of High-Frequency Electromagnetic Force
4. Experimental Analysis of Vibration and Noise of Permanent Magnet Motor Used in Compressor
5. Structural Modal Analysis and Optimization of PMSM in Compressor
5.1. Finite Element Theory of Structural Mode
5.2. Vibration Modal Characteristics of PMSM in Compressor
5.3. Simulation Calculation and Optimization of Natural Frequency
6. Summary
- (1)
- The air-gap flux density harmonics of an SPMSM driven by SVPWM are mainly caused by the sideband harmonic current. The frequencies of the harmonic components of these air-gap flux densities are the same as those of the sideband harmonic current, which can be expressed as , where is the switching frequency, is the fundamental frequency, is a positive integer, is a non-negative integer, and and have different parity.
- (2)
- When the SPMSM is powered by the frequency converter, there is a large high-frequency vibration noise near the switching frequency and its frequency doubling. The main vibrational noise frequency can be expressed as , where is a positive integer, is a non-negative integer, and and have the same parity.
- (3)
- The mechanical vibration characteristics of the whole motor can be determined by the noise spectrum obtained from the experiment. Cooperating with the harmonic response simulation and modal simulation, the main modal shapes can be determined, and their natural frequency ranges can be basically located from the noise spectrum.
- (4)
- According to the response spectrum of the motor vibration, the high-frequency sideband noise near the switching frequency can be improved by optimizing the switching frequency. Considering that the stator has a great influence on the modes of the whole motor, the high-frequency sideband noise near the switching frequency can also be improved by optimizing the stator outer diameter.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
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Rated power | P = 25 kW | The number of stator slots | Z = 36 |
Rated frequency | F = 78 Hz | Stator inner diameter | Di1 = 138 mm |
Rated speed | n = 1560 r/min | Stator outer diameter | D1 = 210 mm |
Pole pairs | P = 3 |
Composition | Theoretic Frequency (Hz) | Measured Frequency (Hz) | Error (%) |
---|---|---|---|
4758 | 4660 | −2.05969 | |
5226 | 5110 | −2.21967 | |
9516 | 9310 | −2.16478 | |
9828 | 9620 | −2.1164 | |
9984 | 9770 | −2.14343 | |
10,140 | 9920 | −2.16963 | |
10,452 | 10,200 | −2.41102 |
Composition | Theoretic Frequency (Hz) | Measured Frequency (Hz) | Error (%) |
---|---|---|---|
4758 | 4750.68 | −0.15385 | |
5226 | 5216.8 | −0.17604 | |
9516 | 9500.64 | −0.16141 | |
9672 | 9656.45 | −0.16077 | |
9828 | 9812.01 | −0.1627 | |
9984 | 9967.48 | −0.16546 | |
10,140 | 10,122.9 | −0.16864 | |
10,297 | 10,278.2 | −0.18258 | |
10,452 | 10,436.5 | −0.1483 |
Order | Natural Frequency | Mode Shape of Motor | Mode Shape of Stator |
---|---|---|---|
Model (0,3) | 3762 Hz | | |
Model (1,3) | 4700 Hz | | |
Model (0,4) | 5616 Hz | | |
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Shou, J.; Ma, J.; Zhang, Z.; Qiu, L.; Xu, B.; Luo, C.; Li, B.; Fang, Y. Vibration and Noise Optimization of Variable-Frequency-Driven SPMSM Used in Compressor Based on Electromagnetic Analysis and Modal Characteristics. Energies 2022, 15, 7474. https://doi.org/10.3390/en15207474
Shou J, Ma J, Zhang Z, Qiu L, Xu B, Luo C, Li B, Fang Y. Vibration and Noise Optimization of Variable-Frequency-Driven SPMSM Used in Compressor Based on Electromagnetic Analysis and Modal Characteristics. Energies. 2022; 15(20):7474. https://doi.org/10.3390/en15207474
Chicago/Turabian StyleShou, Jiabo, Jien Ma, Zhiping Zhang, Lin Qiu, Bowen Xu, Chao Luo, Binqi Li, and Youtong Fang. 2022. "Vibration and Noise Optimization of Variable-Frequency-Driven SPMSM Used in Compressor Based on Electromagnetic Analysis and Modal Characteristics" Energies 15, no. 20: 7474. https://doi.org/10.3390/en15207474