• Title, Summary, Keyword: In-wheel motor

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In-wheel Motor Design for an Electric Scooter

  • Lee, Ji-Young;Woo, Byung-Chul;Kim, Jong-Moo;Oh, Hong-Seok
    • Journal of Electrical Engineering and Technology
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    • v.12 no.6
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    • pp.2307-2316
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    • 2017
  • The aim of this paper is to provide an optimal design of in-wheel motor for an electric scooter (E-scooter) considering economical production. The preliminary development in-wheel motor, which has a direct-driven outer rotor type attached to the E-scooter's rear wheel without any gear, is introduced first. The objective of the optimal design of this in-wheel motor is to improve the output characteristics of the motor and to have a stator form to facilitate automatic winding. Response surface methodology was used for the optimal design and 2-dimensional finite element method was used for electro-magnetic field analysis. Experimental results showed that the designed and fabricated in-wheel motor could satisfy the required specifications in terms of speed, power, efficiency, and cogging torque.

A Study on Cooling Performance of In-wheel Motor for Green Car (그린카용 인휠 모터의 냉각 성능에 관한 연구)

  • Jung, Jung-Hun;Kim, Sung-Chul;Hong, Jung-Pyo
    • Transactions of the Korean Society of Automotive Engineers
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    • v.20 no.1
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    • pp.61-67
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    • 2012
  • The in-wheel motor used in green car was designed and constructed for an electric direct-drive traction system. It is difficult to connect cooling water piping because the in-wheel motor is located within the wheel structure. In the air cooling structure for the in-wheel motor, a outer surface on the housing is provided with cooling grooves to increase the heat transfer area. In this study, we carried out the analysis on the fluid flow and thermal characteristics of the in-wheel motor under the effects of motor speed and heat generation. In order to check the problem of heat release, the analysis has been performed using conjugate heat transfer (conduction and convection). As a result, flow fields and temperature distribution inside the in-wheel motor were obtained for base speed condition (1250 rpm) and maximum speed condition (5000 rpm). Also, the thermo-flow characteristics analysis of in-wheel motor for vehicles was performed in consideration of ram air effect. Therefore, we checked the feasibility of the air cooling for the housing geometry having cooling grooves and investigated the cooling performance enhancement.

Accelerated Life Test of In-Wheel Motor for Mobile Robot (이동로봇용 In-Wheel Motor의 가속수명시험)

  • Kim, Young-Ki;Kim, Sang-Hoon;Kim, Hag-Wone;Mok, Hyung-Soo
    • The Transactions of the Korean Institute of Power Electronics
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    • v.15 no.6
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    • pp.498-505
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    • 2010
  • In-Wheel System is a high-efficiency system to supply a new concept of platform which raises the efficiency of motor drive system and applies it to an environment-friendly automobile by installing a highly efficient electric motor directly to wheels and removing factors of power train. The proliferation of these systems is directly related to the safety of our lives, so check the reliability of the part in the development phase and should be certified. Reliability is the ability of a system or component to perform its required functions under stated conditions for a specified period of time. This paper presents to the verification methods for durability, one of reliability assessments of the Motor, the study calculated acceleration and deceleration torque and the effective torque from driving conditions of In-Wheel Motor, and based on this, it reduced the test time and suggested the verification methods of In-Wheel Motor reliability through the accelerated life test.

A Study on the Enhancement of the Cooling Structure for In-wheel Motor (인휠 모터의 냉각 구조 개선에 관한 연구)

  • Kim, Dae Geon;Kim, Sung Chul
    • Transactions of the Korean Society of Automotive Engineers
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    • v.21 no.1
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    • pp.36-42
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    • 2013
  • Recently, the automobile of the future will be able to substitute an electric vehicle for an internal combustion engine, so the following research is actively in the process of advancing. A traction motor is one of the core parts which compose the electric vehicle. Especially, it is difficult to connect cooling water piping to an in-wheel motor because the in-wheel motor is located within the wheel structure. This structure has disadvantage for closed type and air cooling, so the cooling design of motor housing and internal in-wheel motor is important. In this study, thermo-flow analysis of the in-wheel motor for vehicles was performed in consideration of ram air effect. In order to improve cooling efficiency of the motor, we variously changed geometries of housing and internal shape. As a result, we found that the cooling efficiency was most excellent, in case the cooling groove direction was same with air flow direction and arranged densely. Furthermore, we investigated the cooling performance enhancement with respect to variable geometries of internal in-wheel motor.

Implementation of In-wheel Motor Driving System for Electric Vehicle (In-wheel 모터를 이용한 전기자동차 구동시스템의 구현)

  • Yun, Si-Young;Lee, Ju
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.62 no.6
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    • pp.750-755
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    • 2013
  • In-wheel motor system gets the driving force from direct-driven motor in the wheel of electric vehicle. It is known as good system for vehicles, from an efficiency, packaging, handling and safety. This paper describes motor and inverter technologies, system configuration and control algorithms for in-wheel type electric vehicle. It is necessary to control on an interrelation perspective because this system drives two motors at same time. In system design, IPMSM(Interior Permanent Magnet Synchronous Motor) including a wide operating range and high-speed rpm is used and flux weakening control is performed in constant power range. Under the torque command from the host controller, auto control box, inverter's output torque is calculated with using torque estimation technique and applied to actual vehicle driving system. It is verified that the configuration and the algorithm are suitable for the in-wheel motor system.

Integrated Chassis Control System of a Rear In-wheel Motor Vehicle (후륜 구동 인휠 전기 자동차의 구동 및 현가 통합제어시스템)

  • Kim, Hyundong;Choi, Gyoojae
    • Transactions of the Korean Society of Automotive Engineers
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    • v.24 no.4
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    • pp.439-446
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    • 2016
  • An in-wheel motor vehicle is a type of car that is equipped with an electric motor for each wheel. It is possible to acquire vehicle stability through a seperate driving torque control per wheel, since it directly generates the driving torque via the wheel motors. However, the vehicle ride comfort and road holding performance worsen depending on the increase of the wheel weights. In order to compensate for the impaired performance, an integrated chassis control system of the rear in-wheel motor vehicle is proposed. The proposed integrated chassis control system is composed of a driving torque control system, a semi-active suspension system, and an ESC system. According to the vehicle dynamic simulation of an in-wheel motor vehicle equipped with the integrated chassis control system, it is found that the system can improve the driving stability, ride comfort, and driving efficiency of the in-wheel motor vehicle.

A Study on In-wheel Motor Control to Improve Vehicle Stability Using Human-in-the-Loop Simulation

  • Ko, Sung-Yeon;Ko, Ji-Weon;Lee, Sang-Moon;Cheon, Jae-Seung;Kim, Hyun-Soo
    • Journal of Power Electronics
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    • v.13 no.4
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    • pp.536-545
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    • 2013
  • In this study, an integrated motor control algorithm for an in-wheel electric vehicle is suggested. It consists of slip control that controls the in-wheel motor torque using the road friction coefficient and slip ratio; yaw rate control that controls the in-wheel motor torque according to the road friction coefficient and the yaw rate error; and velocity control that controls the vehicle velocity by a weight factor based on the road friction coefficient and the yaw rate error. A co-simulator was developed, which combined the vehicle performance simulator based on MATLAB/Simulink and the vehicle model of CarSim. Based on the co-simulator, a human-in-the-loop simulation environment was constructed, in which a driver can directly control the steering wheel, the accelerator pedal, and the brake pedal in real time. The performance of the integrated motor control algorithm for the in-wheel electric vehicle was evaluated through human-in-the-loop simulations.

Characteristic Analysis of In-Wheel Motor with Parallel Winding (병렬결선방식을 이용한 인휠 전동기 특성해석)

  • Kim, Tae-Hyoung;Lee, Dong-Hee;Ahn, Jin-Woo;Ha, Byung-Gil;Gang, Byung-Joo
    • Proceedings of the KIEE Conference
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    • pp.96-98
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    • 2008
  • This paper present in-wheel BLDC motor using parallel winding. The voltage of proposed motor is higher than Y-connection three phase BLDC motor in order to separated connection. When the stator resistance and inductance are stable, maximum phase current and maximum torque is increased by high injected voltage. The proposed motor is verified from experimental result of the 2[kW] in-wheel motor on electric vehicle drive.

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The 2nd Excitation Control System of Wound-Rotor Induction Motor with Fly-wheel (Fly-wheel을 갖는 권선형 유도전동기의 2차 여자제어시스템)

  • 오성업;김민태;신기택;최태식;성세진
    • Proceedings of the KIPE Conference
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    • pp.535-539
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    • 1999
  • This paper presents the 2nd excitation control of the wound-rotor induction motor with Fly-wheel. In the wound-rotor induction motor, the primary power is controlled by AC excitation which used the secondary power conversion. Based on theory, this paper describes the dynamic response analysis of the wound-rotor induction motor with Fly-wheel and Simulation using MATLAB is performed to verify the proposed control method.

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The Power Compensation by Wound-Rotor Induction Motor with a Fly-wheel (Fly-wheel을 갖는 권선형 유도전동기에 의한 전력보상)

  • 이동우
    • Proceedings of the KIPE Conference
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    • pp.34-37
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    • 2000
  • This paper presents the power compensation by wound-rotor induction motor with a Fly-wheel. In the wound-rotor induction motor the primary power is controlled by AC excitation which used the secondary power conversion. Based on theory this paper describes the dynamic response analysis of the would-rotor induction motor with Fly-wheel. Simulation and experimental results are performed to verify the proposed control method

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