Design of an External-Rotor Direct Drive E-Bike Switched Reluctance Motor

Howey, Brock; Bilgin, Berker; Emadi, Ali

doi:10.1109/tvt.2020.2965943

Cited by 43 publications

(15 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this section, the tested acoustic noise results of a 12/16 external-rotor SRM prototype is used to validate the pattern for the radial force harmonics in external-rotor SRM rotors. The detailed design of this 12/16 external-rotor SRM is provided in [24]. The test setup for the acoustic noise is shown in Fig.…”

Section: A 12/16 External-rotor Srmmentioning

confidence: 99%

Analytical Calculation of Temporal and Circumferential Orders of Radial Force Density Harmonics in External-Rotor and Internal-Rotor Switched Reluctance Machines

Liang

Callegaro

Howey

et al. 2021

IEEE Open J. Ind. Applicat.

Self Cite

View full text Add to dashboard Cite

This paper presents an analytical method to calculate the temporal and circumferential orders of the radial force density harmonics in switched reluctance machines (SRMs) without running the electromagnetic finite element analysis (FEA). The characteristics of the radial force density harmonics in several SRM topologies are investigated, including the 6/4, 24/16, and 6/14 internal-rotor (IR) SRMs, and 12/16 and 18/24 external-rotor (ER) SRM. The study shows that the temporal and circumferential orders of the radial force density harmonics depend on the pole configuration, the rotational directions of the rotor, the phase excitation sequence, and the rotor or stator radial force density waveform. The acoustic noise of a four-phase 8/6 internal-rotor SRM and a three-phase 12/16 external-rotor SRM was experimentally measured to validate the calculation of the temporal and circumferential orders of the radial force density harmonics. The proposed analytical method helps locate the possible radial force density harmonics of a given SRM configuration. In order to determine the dominant radial force harmonics, the proposed method should be complemented by analyzing the natural frequencies of the motor structure and the forcing frequencies of the radial force harmonics.

show abstract

Section: A 12/16 External-rotor Srmmentioning

confidence: 99%

Analytical Calculation of Temporal and Circumferential Orders of Radial Force Density Harmonics in External-Rotor and Internal-Rotor Switched Reluctance Machines

Liang

Callegaro

Howey

et al. 2021

IEEE Open J. Ind. Applicat.

Self Cite

View full text Add to dashboard Cite

show abstract

“…The main challenges in SRM are higher torque ripple and higher acoustic noise and vibration [1], [3]. Torque ripple can be reduced by choosing a proper pole configuration [4] and by changing the shape of the excitation current using a torque sharing function (TSF) [5]. Various techniques have been proposed to reduce the acoustic noise of SRMs.…”

Section: Introductionmentioning

confidence: 99%

Radial Force Density Calculation of Switched Reluctance Machines Using Reluctance Mesh-Based Magnetic Equivalent Circuit

Watthewaduge

Bilgin

2022

IEEE Open J. Ind. Electron. Soc.

Self Cite

View full text Add to dashboard Cite

Acoustic noise and vibration is one of the shortcomings of a switched reluctance machine (SRM). Harmonics of the radial force waveform in the airgap excite the stator structure at different vibration modes with specific frequencies. The radial force density in the airgap should be calculated before analyzing and mitigating acoustic noise and vibration. This paper proposes a reluctance mesh-based magnetic equivalent circuit (MEC) model to calculate the airgap radial force density. Reluctance mesh-based MEC models are developed for 3phase 6/4, 6/16, 12/8 and 4-phase 8/6, 8/10, and 16/12 SRMs. A technique for the dynamic modeling of SRMs is proposed using the reluctance mesh-based MEC method. Dynamic currents are calculated using the proposed technique and, then, the radial and tangential flux density in the airgap are calculated. The radial force density in the airgap is calculated by applying the Maxwell Stress Tensor method. Fourier series is used to calculate the harmonics of the radial force density. The results obtained from the MEC model are verified using finite element method (FEM) models. The implemented MEC-based dynamic modeling method is validated using experimental results.

show abstract

“…Fyhri and Fearnley 7 demonstrate that the use of shared e‐bikes will increase the number of short trips made by the population and shared e‐bikes have different benefits for different groups of people. Currently, research on shared e‐bikes has focused on shared system design, 8–13 shared e‐bike structure design, 14–18 and battery pack optimization 19–23 . Research on the charging mode of the shared e‐bike is still in its initial phase.…”

Section: Introductionmentioning

confidence: 99%

“…Currently, research on shared e-bikes has focused on shared system design, [8][9][10][11][12][13] shared e-bike structure design, [14][15][16][17][18] and battery pack optimization. [19][20][21][22][23] Research on the charging mode of the shared e-bike is still in its initial phase. Energy is the main problem that deters the development of shared e-bikes, leading to an increase in operating costs in the future.…”

Section: Introductionmentioning

confidence: 99%

An efficient on‐demand charging scheduling scheme for mobile charging vehicle

Zhong

Gao

et al. 2021

Int J Communication

View full text Add to dashboard Cite

Summary Shared transportation is a new way of traveling generated by the rapid development of the “Internet +” and the sharing economy. Due to the limited energy carried by shared e‐bikes, the energy problem becomes the primary obstacle restricting its development. At present, one way to solve the energy problem is to use mobile charging vehicles (MCVs). However, how to schedule MCVs to achieve fast response, reduce energy consumption, and improve charging efficiency is crucial. In this paper, we propose a Charging Scheduling scheme based on Dynamic Characteristic of shared e‐bike in Obstacle Space (CSDC‐OS). Firstly, we design two MCV departure mechanisms to solve the problems of low utilization of MCVs and long waiting time for shared e‐bikes. Then, we design the schedulability conditions based on the A‐star algorithm and the dynamic change of e‐bikes to ensure that MCVs can return to the service station in time. Finally, we propose a charging sequence algorithm based on linear skyline query and a selective insertion algorithm to improve the charging efficiency of MCVs. Simulation results show that the CSDC‐OS can improve the response time, mobile consumption, and charging efficiency by more than 8% on average.

show abstract

Design of an External-Rotor Direct Drive E-Bike Switched Reluctance Motor

Cited by 43 publications

References 13 publications

Analytical Calculation of Temporal and Circumferential Orders of Radial Force Density Harmonics in External-Rotor and Internal-Rotor Switched Reluctance Machines

Analytical Calculation of Temporal and Circumferential Orders of Radial Force Density Harmonics in External-Rotor and Internal-Rotor Switched Reluctance Machines

Radial Force Density Calculation of Switched Reluctance Machines Using Reluctance Mesh-Based Magnetic Equivalent Circuit

An efficient on‐demand charging scheduling scheme for mobile charging vehicle

Contact Info

Product

Resources

About