• Title, Summary, Keyword: Outer Rotor

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Design of Gerotor with Pin-tooth Inner Rotor (핀치형 내부로터의 제로터 설계)

  • Lee, Sung-chul
    • Tribology and Lubricants
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    • v.36 no.2
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    • pp.64-67
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    • 2020
  • In the conventional gerotor design, the circular arc tooth of the outer rotor is first introduced, and then the inner rotor profile is generated by simulating the outer rotor motion while the inner rotor is fixed. The profile generation of tooth meshing exhibits relativity; therefore, the outer rotor profile can be generated by the movement of the inner rotor. In this study, we propose the design of a gerotor with a pin-tooth inner rotor. First, the pin-tooth inner rotor is devised, and then the outer rotor profile is generated. The profile of the inner rotor is simply composed of equally arranged pins along a circle. The root of the inner rotor is designed as a conjugated arc of two pins. The trajectory of the pin center is obtained by the inner rotor operation, and then the outer rotor profile is determined as a parallel curve of the trajectory. In this gerotor design, the inner rotor has a simple configuration, and contact occurs between the pin parts of the inner rotor and the whole profile of the outer rotor. This affects the material selection and machining process. The pin tooth can be used to design the outer and inner rotors, enabling a double gerotor mechanism corresponding to a planetary gear system.

Design and Feasibility Study of Double Gerotor (이중 제로터의 설계 및 응용 가능성에 대한 연구)

  • Lee, Sung-chul
    • Tribology and Lubricants
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    • v.35 no.4
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    • pp.215-221
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    • 2019
  • A gerotor set consists of two elements, an inner rotor and an outer rotor. The outer rotor has one more tooth than the inner rotor and has its centerline positioned at a fixed eccentricity from the centerline of the inner rotor. Although gerotors come in a variety of geometric configurations, all gerotor sets share the basic principle of having generated tooth profiles that provide continuous tight sealing during operation. The size of the gerotor is proportional to the number of teeth and the amount of eccentricity. The interior of an inner rotor with a large number of teeth has an enough space to include other machine elements. In this paper, the double gerotor mechanism, constructed by putting a small gerotor in the interior of a large inner rotor, is conceptualized. The double gerotor set is composed of an inner rotor, a planetary rotor, and an outer rotor. The inside profile of the planetary rotor corresponds to the outer rotor profile of the small gerotor, and the outside profile is the inner rotor profile of the large gerotor. In the double gerotor, the centers of the inner and the outer rotor are coincident because the eccentricities of two gerotors are balanced. The operation of a double gerotor is examined by analyzing the planetary motion, and a feasibility study for application of the double gerotor for hydraulic motors and pumps is performed. The double gerotor set has much application potential as a component of hydraulic systems.

Design of Outer Rotor Type In-Wheel SRM for Welfare Neighborhood Electric Vehicle (복지형 NEV용 외전형 인-휠 SRM 설계)

  • Jeong, Kwang-il;Lee, Dong-Hee;Ahn, Jin-Woo
    • Proceedings of the KIPE Conference
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    • pp.323-324
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    • 2010
  • In this paper, outer rotor type of in-wheel switched reluctance motor(SRM) has been design and analyzed for Welfare Neighborhood Electric Vehicle(WNEV). Designed outer rotor type of in-wheel SRM is set to 4-wheel of WNEV. the motor is 6/8 and outer rotor type. and the driving load and motor characteristics are determined and designed.

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Analysis of Outer Rotor Type BLDC motor vibration characteristics according to slot combination (Outer Rotor Type BLDC 모터의 슬롯 수에 따른 진동 특성 분석)

  • Bang, Ki-Chang;Kim, Kwang-Seok;Kwon, Joong-Hak;Ree, Yeong-Uk;Hwang, Sang-Moon
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.196-201
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    • 2008
  • This paper is about electromagnetic vibration source in outer rotor type of BLDC motors. Experiments are carried out with three pole-slot combinations which are 6 slots, 12 slots, and 24 slots with 4 poles rotor. According to results, vibration sources separate into electromagnetic and mechanical factors. Using the finite element method (FEM), It is analyed that vibration characteristics of electromagnetic source in each type. This paper shows electromagnetic sensitivity to vibration, and introduces necessary point in lower vibration motors. Also rotor balance is important to prevent uneven distribution of magnetic flux between rotor and stator.

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Analysis and Design of Outer-Rotor Type BLDC Motor by Permeance Method (자기저항법을 이용한 외전형 BLDC 모터의 해석 및 설계)

  • Choi, Myung-Jong;Kim, Sun-Dai;Chung, Tae-Kyung
    • Proceedings of the KIEE Conference
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    • pp.86-88
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    • 1995
  • Outer-rotor type brushless motor is designed to run at more constant speed because of large inertia comparing with inner-rotor type. The constant speed is acquired by increasing inertia. Also, the generating torque is proportional to the rotor volume, i. e. rotor diameter. The main idea in this study is to design and analyze the outer-rotor type brushless motor by permeance method with given outer dimension.

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Design of Outer Rotor Type In-Wheel SRM for Welfare Neighborhood Electric Vehicle (복지형 NEV용 외전형 In-Wheel SRM 설계)

  • Jeong, Kwang-Il;Lee, Dong-Hee;Ahn, Jin-Woo
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.60 no.2
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    • pp.309-314
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    • 2011
  • Outer rotor type in-wheel switched reluctance motor for Welfare neighborhood electric vehicle is researched. In-wheel system is to drive the electric vehicle without mechanical transmission, shaft, differential gears or other mechanical system. To calculate drive power for each wheels, the elder's and disable's safety driving conditions are considered. The designed outer rotor SRM has a 6-stator and 8-rotor pole. The determined dimensions as well as the stator and rotor pole arc are simulated and tested with CAD and finite element analysis to verify the performance of the proposed motor.

A Study on the Design Procedure of the Eight Pole Magnetic Bearings for the Inner-rotor and the Outer-rotor Type

  • Lee, Jun-Ho;Park, Chan-Bae;Lee, Byung-Song;Lee, Su-Gil;Kim, Jae-Hee;Jung, Shin-Myung;Lee, Hyung-Woo
    • Journal of Electrical Engineering and Technology
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    • v.8 no.6
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    • pp.1424-1430
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    • 2013
  • This paper presents design procedure of the magnetic bearings used for high-speed electric machines and flywheel energy storage systems. Magnetic bearing can be categorized by inner-rotor type and outer-rotor type according to the position of the rotary disc. These two types are applicable based on application environments such as application space, required attraction force, and controllability. Magnetic bearing is generally designed based on the ratio (geometrical coefficient or geometrical efficiency) of pole width to rotor journal radius but proper ratio is only decided by the analysis. This is the difficulty of the magnetic bearing design. In this paper, proper design technology of the inner-rotor type and outer-rotor-type eight pole magnetic bearings is introduced and compared with the FEM analysis results, which verifies the proposed design procedure is suitable to be applied to the design of the magnetic bearings for the industrial applications and flywheel energy storage system.

Design and Measurement of Switched Reluctance Motor with Short Magnet Flux Path (자로축소형 스위치드 릴럭턴스 모터의 설계와 측정)

  • Kim, Jin-Sun
    • Proceedings of the KIEE Conference
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    • pp.149-154
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    • 2007
  • The classical literature on SR motor design tends to focus on inner-rotor type motor rather than outer-rotor type motor, and dose not provide a complete procedure for configuration of outer-rotor type SR motor calculations that are also needed in every SR motors design. It is interested in the design of SR motors to shortening the magnet flux path in the iron core for reducing the iron loss. The 5 phases outer-rotor type SR Motor with short magnet flux path is introduced in this paper. For this the rotor of prototype is designed in U-form with 8 rotor poles that are in 4 U-forms from one another separate constructed.

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Design of 3MW Class Outer Rotor Type PMSG for Wind Turbine (풍력발전용 3MW급 외부회전자형 영구자석 동기발전기 설계)

  • Kim, Tae-Hun
    • New & Renewable Energy
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    • v.6 no.4
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    • pp.41-49
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    • 2010
  • Over the last decade, wind turbine industry has rapidly increased around world. These days many parts of the wind generators are induction generator. But it has some problems such as gearbox failure, rotor excitation and maintenance. Thus many manufacturers are considered permanent magnet synchronous generator named PMSG and direct drive. PMSG uses NdFeB magnet has many the advantage compare with induction generator. In this study, 3MW class outer rotor type PMSG for wind turbine is proposed. The generator features 2.6m stator outer radius, 1200mm stator length, 81 pole pairs, 14 rated rpm, 42kN/$m^2$ shear force density and 94.2% efficiency. Design and analysis generator using FEM program. Then calculate and derivate no load voltage, losses, conductor temperature. To reduce total harmonic distortion and cogging torque, the stator is applied the stator skewing. And to evaluate the designed generator, compare with other generators by active mass per rating torque and torque density.

Rotordynamic Influences of a Tie Shaft in a APU Gas Turbine Rotor-Bearng System (보조동력 개스터빈 로터-베어링 시스템에서 체결축의 로터다이나믹 영향)

  • Lee, An-Sung;Lee, Young-Seob
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.1051-1057
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    • 2000
  • A projected 100 kW APU gas turbine rotor-bearing system has a main outer shaft, which is composed of some numbers of segmented sections for manufacturing and assembly conveniences. For a secure assembly of the segmented sections a tie shaft or inner shaft is installed inside of the outer shaft and a tensional axial preload of 50,000 N is provided to it. In this paper it is intended to set-up a sound modeling method of the APU rotor system, and particularly, the influences of the tie shaft on the rotordynamic characteristics of the entire APU gas turbine rotor-bearing system are investigated. Analysis results show that as a conservative design practice the inner tie shaft should be actively modeled in the rotordynamic analysis of the APU rotor-bearing system, and its effects on the dynamic behaviors of the outer shaft should be thoroughly design-reviewed.

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