External-Rotor 6/10 Switched Reluctance Motor for an Electric Bicycle

Jianing Lin, Nigel Schofield, Ali Emadi

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

As a cost-effective, healthy, and environmental friendly personal mode of transportation, electric bicycles (E-bikes) are gaining an increasing market share from conventional bicycles and automobiles. Considering the legal rules in Ontario, Canada, a 500-W electric motor providing power assist makes the E-bike more attractive to urban commuters. The simple structure, high torque, and power density, as well as the potential for low cost make the switched reluctance machine (SRM) a strong candidate for E-bike traction. In this paper, a three-phase, external-rotor SRM with 6 stator poles and 10 rotor poles is designed for a representative E-bike. The design of an external rotor arrangement of the 6-10 SRM topology has not previously been reported, this brings the challenge of sizing the geometry of this topology, but the solution offers a new contribution to published works. The external-rotor arrangement is chosen to facilitate ease of integration into the wheel hub structure of a typical pedal bicycle. The increased rotor poles yield improved torque ripple reduction than more conventional (i.e., 6-4 and 12-8) SRM design, which is an essential feature for low-speed rider comfort. The final machine design is experimentally validated via a full system prototype and dynamometer test facility. Results highlight some limitation of the 2-D finite element analysis (FEA) study in terms of the winding inductance calculation, more accurate 3-D FEA model is implemented
Original languageEnglish
Pages (from-to)348-356
Number of pages9
JournalIEEE Transactions on Transportation Electrification
Volume1
Issue number4
DOIs
Publication statusPublished - 1 Dec 2015
Externally publishedYes

Fingerprint

Bicycles
Reluctance motors
bicycle
Rotors
Pole
Poles
Machine design
Torque
Topology
Finite element method
Dynamometers
commuter
model analysis
Electric motors
market share
costs
Test facilities
Inductance
Stators
Automobiles

Cite this

@article{5483c4cc7bbb412190d1177093f70a16,
title = "External-Rotor 6/10 Switched Reluctance Motor for an Electric Bicycle",
abstract = "As a cost-effective, healthy, and environmental friendly personal mode of transportation, electric bicycles (E-bikes) are gaining an increasing market share from conventional bicycles and automobiles. Considering the legal rules in Ontario, Canada, a 500-W electric motor providing power assist makes the E-bike more attractive to urban commuters. The simple structure, high torque, and power density, as well as the potential for low cost make the switched reluctance machine (SRM) a strong candidate for E-bike traction. In this paper, a three-phase, external-rotor SRM with 6 stator poles and 10 rotor poles is designed for a representative E-bike. The design of an external rotor arrangement of the 6-10 SRM topology has not previously been reported, this brings the challenge of sizing the geometry of this topology, but the solution offers a new contribution to published works. The external-rotor arrangement is chosen to facilitate ease of integration into the wheel hub structure of a typical pedal bicycle. The increased rotor poles yield improved torque ripple reduction than more conventional (i.e., 6-4 and 12-8) SRM design, which is an essential feature for low-speed rider comfort. The final machine design is experimentally validated via a full system prototype and dynamometer test facility. Results highlight some limitation of the 2-D finite element analysis (FEA) study in terms of the winding inductance calculation, more accurate 3-D FEA model is implemented",
author = "Jianing Lin and Nigel Schofield and Ali Emadi",
year = "2015",
month = "12",
day = "1",
doi = "10.1109/TTE.2015.2502543",
language = "English",
volume = "1",
pages = "348--356",
journal = "IEEE Transactions on Transportation Electrification",
issn = "2332-7782",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
number = "4",

}

External-Rotor 6/10 Switched Reluctance Motor for an Electric Bicycle. / Lin, Jianing; Schofield, Nigel; Emadi, Ali.

In: IEEE Transactions on Transportation Electrification, Vol. 1, No. 4, 01.12.2015, p. 348-356.

Research output: Contribution to journalArticle

TY - JOUR

T1 - External-Rotor 6/10 Switched Reluctance Motor for an Electric Bicycle

AU - Lin, Jianing

AU - Schofield, Nigel

AU - Emadi, Ali

PY - 2015/12/1

Y1 - 2015/12/1

N2 - As a cost-effective, healthy, and environmental friendly personal mode of transportation, electric bicycles (E-bikes) are gaining an increasing market share from conventional bicycles and automobiles. Considering the legal rules in Ontario, Canada, a 500-W electric motor providing power assist makes the E-bike more attractive to urban commuters. The simple structure, high torque, and power density, as well as the potential for low cost make the switched reluctance machine (SRM) a strong candidate for E-bike traction. In this paper, a three-phase, external-rotor SRM with 6 stator poles and 10 rotor poles is designed for a representative E-bike. The design of an external rotor arrangement of the 6-10 SRM topology has not previously been reported, this brings the challenge of sizing the geometry of this topology, but the solution offers a new contribution to published works. The external-rotor arrangement is chosen to facilitate ease of integration into the wheel hub structure of a typical pedal bicycle. The increased rotor poles yield improved torque ripple reduction than more conventional (i.e., 6-4 and 12-8) SRM design, which is an essential feature for low-speed rider comfort. The final machine design is experimentally validated via a full system prototype and dynamometer test facility. Results highlight some limitation of the 2-D finite element analysis (FEA) study in terms of the winding inductance calculation, more accurate 3-D FEA model is implemented

AB - As a cost-effective, healthy, and environmental friendly personal mode of transportation, electric bicycles (E-bikes) are gaining an increasing market share from conventional bicycles and automobiles. Considering the legal rules in Ontario, Canada, a 500-W electric motor providing power assist makes the E-bike more attractive to urban commuters. The simple structure, high torque, and power density, as well as the potential for low cost make the switched reluctance machine (SRM) a strong candidate for E-bike traction. In this paper, a three-phase, external-rotor SRM with 6 stator poles and 10 rotor poles is designed for a representative E-bike. The design of an external rotor arrangement of the 6-10 SRM topology has not previously been reported, this brings the challenge of sizing the geometry of this topology, but the solution offers a new contribution to published works. The external-rotor arrangement is chosen to facilitate ease of integration into the wheel hub structure of a typical pedal bicycle. The increased rotor poles yield improved torque ripple reduction than more conventional (i.e., 6-4 and 12-8) SRM design, which is an essential feature for low-speed rider comfort. The final machine design is experimentally validated via a full system prototype and dynamometer test facility. Results highlight some limitation of the 2-D finite element analysis (FEA) study in terms of the winding inductance calculation, more accurate 3-D FEA model is implemented

U2 - 10.1109/TTE.2015.2502543

DO - 10.1109/TTE.2015.2502543

M3 - Article

VL - 1

SP - 348

EP - 356

JO - IEEE Transactions on Transportation Electrification

JF - IEEE Transactions on Transportation Electrification

SN - 2332-7782

IS - 4

ER -