Application of Deep Learning in Motor Vibration and Noise Suppression Based on Negative Magnetostrictive Effect

Zhang Xin,Li Chunzhi,Xue Ming,Wang Wenbin,Zhu Lihua 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.3

The suppression of vibration and noise is one of the critical problems in the optimal design of the motor. The vibration and noise caused by the magnetostrictive effect can not be ignored. In this paper, the vibration and noise caused by the magnetostrictive effect are suppressed by drilling holes in the stator and filling the holes with negative magnetostrictive material. Firstly, the electromagnetic–mechanical coupling model is established. By traversing all the drilling positions by finite element analysis (FEA), the stress value is calculated, and the drilling position corresponding to the minimum local stress is determined. It is found that the resource consumed by FEA is expensive, and the calculation time is prolonged. Deep learning is introduced as an alternative model to calculate the hole’s position and size. The Pix2Pix, Pix2PixHD, CycleGAN, and StarGAN are experimented with based on the PyTorch environment. Through the experiment, it is found that deep learning has an absolute advantage over the FEA in time which ensures a high accuracy rate. Finally, an experimental platform for measuring the strain of the motor stator is designed. According to the best positions and apertures of holes are obtained by the simulation and the actual situation, we drill holes in the motor stator and fill the holes with Ni, a negative magnetostrictive material. The result shows that the stator’s local stress is reduced by about 16%. The vibration and noise caused by the magnetostrictive effect are suppressed effectively.

Development of Magnetostrictive Control Rod Position Indicator

유은주(Eun-Ju Yoo),박영우(Young-Woo Park),노명규(Myounggyu Noh) Korean Society for Precision Engineering 2017 한국정밀공학회지 Vol.34 No.12

This study presents the development of a magnetostrictive control rod position indicator (Mag-CRPI) for improving safety of nuclear power generation. Mag-CRPI principle is based on two magnetostrictive effects: The Wiedemann effect and the Villari effect. The position may be estimated by multiplying time-of-flight (TOF) of the elastic wave from the cursor magnet to the sensing coil, and a sound speed of the magnetostrictive wire. A Mag-CRPI prototype has been designed and built. Experiments are conducted to characterize the Mag-CRPI. Change of the TOF is obtained with cursor magnet movement interval of 100 ㎜. Averaged position error is estimated to be 0.002m over the entire measuring length. Based on experimental results, the performance of Mag-CRPI is validated, thereby confirming feasibility of a nuclear reactor-internal control rod.

Wiedemann 효과를 이용한 텐던의 인장력 측정

강선주(Sunju Kang),손대락(Derac Son),조창빈(Changbin Joh),이정우(Jungwoo Lee) 한국자기학회 2016 韓國磁氣學會誌 Vol.26 No.4

In this study, we have constructed a measuring system to investigate tensile stress of tendons, which is employed in bridges, by means of the magnetic non-destructive testing (NDT) method. For the twisted 7-strands tendon, we have used Wiedemann effect. An accurrent was applied to the tendon and voltage induced from Search Coil on Tendon (SCT) under applying tensile stress was measured. The measuring system consists of tensile stress applying apparatus up to 2 GPa, and ac current supply to apply current to the tendon directly to magnetize the tendon. We have invested two kinds of tendon which were produced by different companies for testing with constructed measuring system. Voltage induced from SCT was decreased up to 1.5 GPa linearly and two kinds of tendon which were produced by different companies shows similar trends. Thus, Wiedemann effect was also applicable to measure tensile stress of tendon by means of magnetic NDT.

자기변형 효과를 이용한 배관의 비접촉 종진동 모달 테스팅

박찬일(Chan Il Park),한순우(Soon Woo Han),김윤영(Yoon Young Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5

The objective of this presentation is to present an efficient longitudinal modal testing technique in pipes or solid cylinders. Longitudinal vibration is an important vibration mode occurring in the cylindrical structures subjected force oscillating along longitudinal direction, but it is not easy to determine experimentally. The working principle employed for the measurement is the coupling phenomenon between mechanical deformation and magnetic field, known as the magnetostrictive effect. This effect has been used to generate and measure ultrasonic waves, but seldom used to deal with audible vibrations. The performance of the proposed method is tested experimentally, and the experimental results are compared with theoretical predictions.

The Dumb-bell Shaped Magnetostrictive/Piezoelectric Transducer

Jianzhong Li,Yumei Wen,Ping Li 한국자기학회 2011 Journal of Magnetics Vol.16 No.4

Traditional magnetostrictive/piezoelectric laminate composites are generally in the regular geometries such as rectangles or disks. To explore properties of the irregular geometry magnetostrictive/piezoelectric transducer in the fundamental resonant frequency, a step dumb-bell shaped Magnetoelectric (ME) transducer is presented in this study. Both analytical and experimental investigations are carried out for the dumb-bell shaped transducer in the fundamental frequency. Comparing with the traditional rectangular transducer, the theory shows the resonant frequency of dumb-bell shaped transducer is reduced 31%, and the experiment gives the result of that is 37% which is independent of dc magnetic fields. The ratio of magnetoelectric voltage coefficient (MEVC) between the dumb-bell shaped and rectangular shaped transducers in theory is 66% comparing with that of in experiment is varying from 140% to 33% when the dc field is increased from 0 Oe to 118 Oe.

Inverse Magnetostrictive Effect in NixFe1-x (1≤ x ≤0.8) Thin Films Deposited on a Polypropylene Substrate

Seungha Yoon 한국자기학회 2022 Journal of Magnetics Vol.27 No.3

The magnetostriction effect is a unique phenomenon observed in magnetic materials due to applied stress. The permeability μ of the magnetic material increases or decreases depending on the sign of the magnetostriction coefficient λ based on the direction of the applied stress. For example, nickel has a negative λ, whereas iron has a positive λ for the same tensile (+) or compressive (-) stresses. However, the magnetostriction effect is reported to disturb the functionality of some spintronic applications, such as magnetic sensors and actuators, under the influence of an external magnetic field. Therefore, suppression of the magnetostriction effect is a challenge in developing flexible spintronic devices. In this study, the magnetostriction effect of the NixFe1-x thin films was investigated under different stress conditions. The composition of the thin film was manipulated by varying the deposition thickness of nickel and Ni8Fe2 targets using a co-sputtering system. Magnetization reversal behaviors of the NixFe1-x thin films were observed under the influence of an external magnetic field by using a vibrating sample magnetometer (VSM), before and after the application of bending stress. The negative magnetostriction effect of nickel was decreased by increasing the iron composition in the thin film, owing to the opposite sign of the magnetostriction coefficient. Finally, an extremely low magnetostriction was achieved at x = 0.8. The results of this study suggest that the magnetostriction effect can be controlled by varying the composition of the thin films and a sufficiently small magnetostriction effect can be observed at the permalloy composition between nickel and iron.

Vibration reduction method of switched reluctance motors with amorphous alloy cores based on inverse-magnetostriction effect

Ben, Tong,Wang, Jin,Chen, Long,Jing, Libing,Yan, Rongge The Korean Institute of Power Electronics 2022 JOURNAL OF POWER ELECTRONICS Vol.22 No.11

The amorphous alloy used in a switched reluctance motor core can greatly improve the efficiency of the motor. However, its large magnetostrictive coefficient and strong stress sensitivity (i.e., inverse-magnetostriction effect) increase the core vibration and limit the precise control capability of the electrical signals. A vibration reduction method based on the inverse-magnetostriction effect is proposed to control the electromagnetic vibration of a switched reluctance motor with amorphous alloy cores (SRMA). First, a nonlinear magnetostriction and inverse-magnetostriction effect model (NMIE model) of an amorphous alloy and the compressive stress applied structure for the stator teeth are proposed. Then, considering the influence of static compressive stress and dynamic electromagnetic stress on the magnetic properties of the core material, a two-way dynamic electromagnetic force coupling model of the SRMA is constructed and solved. Finally, the vibration characteristics of the SRMA core are calculated. The obtained results show that the radial electromagnetic stress of the improved structure is reduced by 33.6%, which verifies the feasibility of the proposed vibration reduction method.

비정질 ${Tb_{45.7}}{Fe_{54.3-x}}{Co_x}$ 및 ${Tb_{50.2}}{Fe_{49.8-x}}{Co_x}$ (0$\leqq$x$\leqq$9.6) 합금박막의 자기변형 및 자기적 특성

최용석,조성수,윤기갑,이완수,이영,김종오,Choi, Y.S.,Cho, S.S.,Yoon, G.G.,Lee, W.S.,Li, Ying,Kim, C.O. 한국재료학회 2001 한국재료학회지 Vol.11 No.8

비정질 $Tb_{45.7}$ $Fe_{54.3-x}$ /$Co_{x}$ 및 $Tb_{50.2}$ /$_{Fe}$ 49.8-x/$Co_{x}$ (0$\leq$$x\leq$9.6) 합금박막의 자기적 특성 및 자기변형특성에 대하여 체계적으로 조사하였다. 박막제조는 Fe 타게트에 Tb, Co 소편으로 구성된 복합타겟 방식의 rf 마그네트론 스퍼터링법에 의해 제조하였다. XRD 조사에의 한 박막의 미세구조는 잘 발달된 비정질 구조를 나타내었다. $Tb_{45.7}$ $Fe_{54.3-x}$ $Co_{x}$ (x=2~4)에서 우수한 고유자기변형특성 및 저자기장자기변형특성을 얻었다. 즉, 100 Oe의 저자장에서 130ppm의 자기변형을 나타내었으며 고유자기변형 (인가 자기장, 5 kOe)은 330ppm에서 400ppm으로 증가하였다. The magnetic and magnetostrictive properties of amorphous Tb/sub 45.7/Fe/sub 54.3-x/Co/sub x/ and Tb/sub 50.2/Fe/sub 49.8-x/Co/sub x/ (0≤x≤9.6) thin films have systematically been investigated. The films were fabricated by rf magnetron sputtering using a composite target which consists of a Fe plate and Tb, Co chips. The microstructure mainly consists of an amorphous phase. Excellent intrinsic and low magnetic-field-magnetostrictive properties were achieved in Tb/sub 45.7/Fe/sub 54.3-x/Co/sub x/ and Tb/sub 50.2/Fe/sub 49.8-x/Co/sub x/ (0≤x≤9.6). The magnetostriction of 130 ppm was obtained with low field of 100 Oe. The intrinsic magnetostriction(applied field, 5 kOe) were increased from 330ppm to 400ppm.

Electric-field control of magnetic property in perpendicularly magnetized Co_0.25Pd_0.75/PMN-PT heterostructure

Kim, J.W.,Kim, J.H.,You, C.Y.,Shin, S.C. Elsevier 2017 CURRENT APPLIED PHYSICS Vol.17 No.7

<P>We report about the electric-field control of magnetic properties in a perpendicularly magnetized Co0.25Pd0.75 film deposited on PMN-PT (lead magnesium niobate-lead titanate) substrate. The effective perpendicular anisotropy coefficient K-eff is efficiently tuned via the electric field up to 2 MV/m from 2.5 x 10(4) to 0.8 x 10(4) J/m(3), which leads to the change of the effective magnetic anisotropy field mu(0)Delta H-eff = -45 mT. With a time-resolved magneto-optical Kerr effect, we observed the precession frequency change Delta f = 0.8 GHz. Our simulation estimates that this value corresponds to Df = -3 GHz and Delta f/f = -0.23 in a scheme of ferromagnetic resonance measurement. (C) 2017 Published by Elsevier B.V.</P>

Electric-field control of magnetic property in perpendicularly magnetized Co0.25Pd0.75/PMN-PT heterostructure

김지완,김주현,유천열,신성철 한국물리학회 2017 Current Applied Physics Vol.17 No.7

We report about the electric-field control of magnetic properties in a perpendicularly magnetized Co0.25Pd0.75 film deposited on PMN-PT (lead magnesium niobate-lead titanate) substrate. The effective perpendicular anisotropy coefficient Keff is efficiently tuned via the electric field up to 2 MV/m from 2.5 104 to 0.8 104 J/m3, which leads to the change of the effective magnetic anisotropy field m0DHeff ¼ 45 mT. With a time-resolved magneto-optical Kerr effect, we observed the precession frequency change Df ¼ 0.8 GHz. Our simulation estimates that this value corresponds to Df ¼ 3 GHz and Df/f ¼ 0.23 in a scheme of ferromagnetic resonance measurement.