• Title/Summary/Keyword: Stator Teeth

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Fabrication of two sided stator of traveling wave rotary USM (양면 Teeth구조를 가지는 진행파 회전형 초음파 모터의 고정자 설계 및 제작)

  • Oh, Jin-Heon;Lim, Jong-Nam;Lee, Jong-Sub;Lim, Kee-Joe
    • Proceedings of the KIEE Conference
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    • 2007.11a
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    • pp.96-97
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    • 2007
  • A stator of ultrasonic motor of high torque with a new configuration is proposed. The stator designed newly is two sided vibrator consisting of toothed metal disk with piezoelectric ceramic ring bonded on both face of disk. which generates a flexural traveling wave along the circumference of disk. it produces a large vibrating force and amplitude because the vibrator is sandwiched by two piezoelectric ring. The finite element method was used to compute the vibration mode of the stator with a outer diameter of 48mm. A 6th vibration mode was chosen as operation mode with resonance frequency about 72kHz. According to the design, the prototype stator was fabricated and its performance was measured.

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3D FE Analysis of Hall Effect Torque Sensor and Shape Design of Its Stator teeth (홀소자 토크센서의 3차원 유한요소해석 및 고정자 치 형상설계)

  • Lee, Bo-Ram;Kim, Young-Sun;Park, Il-Han
    • Proceedings of the KIEE Conference
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    • 2009.07a
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    • pp.702_703
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    • 2009
  • Electric Power Steering(EPS) system is superior to conventional Hydraulic Power Steering(HPS) system in aspect of fuel economy and environmental concerns. The EPS system consists of torque sensor, electric motor, ECU(Electric Control Unit), gears and etc. Among the elements, the torque sensor is one of the core technologies of which output signal is used for main input of EPS controller. Usually, the torque sensor has used torsion bar to transform torsion angle into torque. The torsion angle of both ends of a torsion bar is measured by a contact variable resistor. In this paper, the sensor is accurately analyzed using 3D finite element method and its characteristics with respect to four different shapes of the stator teeth are compared. The four shapes are rectangular, triangular, trapezoidal and circular type.

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Comparisons of Linear Characteristic for Shape of Stator Teeth of Hall Effect Torque Sensor

  • Lee, Boram;Kim, Young Sun;Park, Il Han
    • Journal of Magnetics
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    • v.17 no.4
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    • pp.285-290
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    • 2012
  • Electric Power Steering (EPS) system is superior to conventional Hydraulic Power Steering (HPS) system in aspect of fuel economy and environmental concerns. The EPS system consists of torque sensor, electric motor, ECU (Electric Control Unit), gears and etc. Among the elements, the torque sensor is one of the core technologies of which output signal is used for main input of EPS controller. Usually, the torque sensor has used torsion bar to transform torsion angle into torque and needs linear characteristic in terms of flux variation with respect to rotation angle of permanent magnet. The torsion angle of both ends of a torsion bar is measured by a contact variable resistor. In this paper, the sensor is accurately analyzed using 3D finite element method and its characteristics with respect to four different shapes of the stator teeth are compared. The four shapes are rectangular, triangular, trapezoidal and circular type.

Design Characteristics of Torque Harmonics Reduction of Induction Motors for Electric Vehicle Propulsion

  • Jeon, Kyung-Won;Kim, Yong-Jae;Jung, Sang-Yong
    • Journal of Magnetics
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    • v.18 no.2
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    • pp.212-215
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    • 2013
  • This paper deals with torque harmonic characteristics and its reduction design of induction motors for electric vehicle (EV) propulsion. For calculating the stator harmonic flux of squirrel-cage induction motor, the numerical methods have been employed on the structural configuration design of stator and rotor teeth. In particular, torque ripples including spatial harmonics are obtained by Finite Element Method (FEM), and their individual harmonic components are identified with Fast Fourier Transform (FFT). In this paper, design modification on the teeth surface gives rise to the significant reduction of torque ripples including spatial torque harmonics, which have been obtained with FEM.

Design and Development of Rectangular Type High Torque Hybrid Step Motor (사각 고토오크 하이브리드 스텝모터의 설계 및 개발)

  • Choi, Myung-Jong;Chung, Tae-Kyung
    • Proceedings of the KIEE Conference
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    • 1994.07a
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    • pp.129-131
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    • 1994
  • Rectangular type hybrid step motor is designed to generate thirty percents higher torque than existing step motors. The torque for the motor is generated by the electromagnetic force at the air gap between the stator and rotor. The generating torque is proportioned to the rotor volume, i. e. rotor diameter. The main idea in this study is that the diameter of rotor is increased to generate more torque for the same overall motor size. This motors are manufactured by varying the shape of the teeth width of the stator and rotor. The optimum shape of the teeth is selected from the standpoint as smaller step angular accuracy.

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A study on structure optimization to improve operating characteristic of Spoke Type Motor (Spoke Type Motor의 운전특성 향상을 위한 구조 최적화연구)

  • Han, Kwang-Kyu;Jang, Ki-Bong;Kim, Gyu-Tak
    • Proceedings of the KIEE Conference
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    • 2008.04c
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    • pp.35-37
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    • 2008
  • This paper deals with a design to improve operating characteristic of spoke type BLDC motor. The rotor and stator is redesigned as rounding teeth of stator and pole surface of rotor. Result, cogging torque is reduced greatly. The Finite Element Analysis(FEM) is used to characteristics. The Prototype has been manufacturing to confirmed the validity of the proposed technique.

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Reduction of Cogging Torque in BLDC Motors (BLDC 전동기의 코깅 토오크 저감설계)

  • Kim, Suk-Ki;Chung, Tae-Kyung
    • Proceedings of the KIEE Conference
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    • 1995.07a
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    • pp.83-85
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    • 1995
  • In a permanent magnet motor, cogging torque arises from the intersection of the rotor magnets with the steel teeth on the stator. This paper describes design measures which can be taken to reduce the cogging torque. In this paper for the optimal shape design of brushless DC motor, evolution strategy is investigated to find the dimension of stator of BLDC motor that minimizes the cogging torque. The corresponding field analysis is performed by two-dimensional finite element method.

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Thrust Analysis of Linear Synchronous Reluctance motor according to Design Parameters (직선형 동기 릴럭턴스 전동기의 설계변수에 따른 추력 특성 해석)

  • Jang, Seok-Myeong;Park, Ji-Hoon;Kwon, Jeong-Ki
    • Proceedings of the KIEE Conference
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    • 2004.10a
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    • pp.89-91
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    • 2004
  • This paper deals with thrust characteristic by design parameter of linear synchronous reluctance motor(LSynRM). Mover of LSynRM used stator of linear induction machine. Design parameter being teeth width, teeth depth, airgap and displacement, we analyzed thrust characteristic on singleness or complex case. Also, we presented thrust characteristic using finite element method.

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Design and Characteristics Analysis of Segmental Rotor Type 12/8 poles SRM with single teeth windings (단일치 권선을 가지는 분절회전자형 12/8SRM의 설계 및 특성해석)

  • Jeong, Guang-Il;Lee, Dong-Hee;Ahn, Jin-Woo
    • Proceedings of the KIPE Conference
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    • 2014.11a
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    • pp.39-40
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    • 2014
  • In this paper, a novel 12/8 segmental rotor type switched reluctance motor (SRM) is proposed. Different from conventional structures, the proposed rotor consists of a series of discrete segments, and the stator is constructed from two types of stator poles: exciting and auxiliary poles. Moreover, in this structure short flux paths are taken and no flux reverse exists in the stator. While the auxiliary poles are not wound by the windings, which only provide the flux return path. Compared with conventional 12/8 SRM, the proposed structure increases the electrical utilization of the machine and decreases the core losses, which may lead to high efficiency. To verify the proposed structure, finite element method (FEM) is employed to get static and dynamic characteristics. Finally, a prototype of the proposed motor is tested for characteristics comparisons.

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Analysis of Radial Force Density as a Vibration Source in Brushless DC Motor Using 3D Equivalent Magnetic Circuit Network Method (3차원 등가자기회로망법을 이용한 Brushless DC 모터의 진동원으로서의 Radial Force Density 해석)

  • Chun, Y.D.;Hur, J.;Yoon, S.B.;Hong, J.P.;Hyun, D.S.
    • Proceedings of the KIEE Conference
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    • 1997.07a
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    • pp.171-173
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    • 1997
  • This paper presents analysis of the radial force density in brushless DC motor of which distribution is not uniform in the axial direction. The analysis considering 3D shape of teeth and overhang is not only important but essential to calculate the radial force density that acts on the teeth of stator, because it is frequent source of vibration and changes at the end of teeth. For the analysis, a new 3D equivalent magnetic circuit network method taking into account movement of the rotor without remesh is proposed. The radial force density is calculated by Maxwell stress tensor and analyzed by discrete Fourier transform.

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