Frequency Response Analysis of Electromagnetically Induced Vibration of Inverter Motors

Nemoto, Kanako

doi:10.1299/kikaib.78.993

Trans.JSME, Ser.B

2012

DOI: 10.1299/kikaib.78.993

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Frequency Response Analysis of Electromagnetically Induced Vibration of Inverter Motors

Kanako Nemoto

Abstract: Vibration and noise need to be calculated with a high degree of accuracy to estimate the radiated noise and vibration induced by the electromagnetic force from a motor. In the case of inverter motors, changes in rotation speed and load lead to changes in exciting frequencies and amplitudes of electromagnetic force harmonics. We developed a way to analyze frequency responses of electromagnetically induced vibration using the electromagnetic force in a representative revolution speed in the above conditions. We … Show more

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Cited by 2 publications

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A study on electromagnetic induced vibration of the three-phase induction motor for small cooling fans by experimental analysis (Reduction of electromagnetic induced vibration by magnetic wire specification)

Takahashi¹,

Yamanaka²,

Oishi³

et al. 2016

Transactions of the JSME (In Japanese)

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Recently, cooling fans have been used for not only general industrial machines but also precision machines, such as medical care products and optical equipment, and these generate more requirements about vibration limitations. The main vibration of cooling fans caused by rotating unbalance and resonance has been reduced, so electromagnetic induced vibration, which was not considered before, now has to be reduced. The purpose of this study is to control the electromagnetic induced vibration of 2 poles three-phase induction motors that rotate fast, such as for cooling fans. In this paper, it is shown that, the number of coils that is one of the magnet wire specification controls electromagnetic force and electromagnetic induced vibration by an experimental study of 2 poles three-phase induction motor that has an output of 70W, as follows; the difference of magnet wire specification can be quantified by the space distribution of magnetomotive force (SDMF), SDMF can be inferred from measuring data of magnetic flux by sensor wire method to be confirmed identical to the theory, the effective value of the difference between SDMF and a sine wave has correlation with electromagnetic induced vibration and increasing number of coils from 1 coil / pole / phase to 3 coils reduces the effective value of the difference between SDMF and a sine wave, and also reduces electromagnetic induced vibration about 20 dB.

show abstract

A study on electromagnetic induced vibration of the three-phase induction motor for small cooling fans by experimental analysis (Reduction of electromagnetic induced vibration by magnetic wire specification)

Takahashi¹,

Yamanaka²,

Oishi³

et al. 2016

Transactions of the JSME (In Japanese)

View full text Add to dashboard Cite

show abstract

Development of ultralow noise motors by using windings as a sensor (Noise reduction of motors by realizing an eccentricity of under one micrometer)

Yoshikuwa

Kometani

Miyamoto

et al. 2018

Transactions of the JSME (In Japanese)

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Motors are used in many appliances, and noise reduction is strongly demanded. One of the main causes of noise is electromagnetic excitation force and it is well known that the excitation force is increased by the eccentricity of the rotor to the stator. For this reason, it is very important to decrease the eccentricity, but there are limits because the eccentricity is due to inevitable manufacturing tolerances or assembly errors. So, we propose a method to estimate the eccentricity of the motors in the process of manufacturing by using windings as a sensor. When the rotor and the stator are in an eccentric condition, the impedance of each winding is different. We developed an experimental apparatus that can set the amount of eccentricity and verified that the terminal voltage of each winding changes proportionally to the eccentricity. In order to produce motors with eccentricity of almost zero, we need to estimate the two-dimensional amount of eccentricity in a very short time. When the number of turns of each winding is different, there is interaction between each winding and so the accuracy of the estimation decreases. To solve these problem, we applied a different frequency of voltage to the winding located on the x axis and the winding located on the y axis, so that we can estimate the amount of eccentricity for the x direction and the y direction with high accuracy at the same time. We also developed a way to produce motors by using this technology. After detecting the terminal voltage of each winding under the tentative assembly situation, we adjust the amount of eccentricity to almost zero and fix the motor by laser welding. As a result, we were able to mass produce motors with eccentricity of under one micrometer and with a very low noise level.

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Frequency Response Analysis of Electromagnetically Induced Vibration of Inverter Motors

Cited by 2 publications

References 2 publications

A study on electromagnetic induced vibration of the three-phase induction motor for small cooling fans by experimental analysis (Reduction of electromagnetic induced vibration by magnetic wire specification)

A study on electromagnetic induced vibration of the three-phase induction motor for small cooling fans by experimental analysis (Reduction of electromagnetic induced vibration by magnetic wire specification)

Development of ultralow noise motors by using windings as a sensor (Noise reduction of motors by realizing an eccentricity of under one micrometer)

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