Performance and cost comparison of reluctance motors used for electric bicycles

Kerdsup, Burin; Fuengwarodsakul, Nisai H.

doi:10.1007/s00202-016-0373-6

Cited by 11 publications

(7 citation statements)

References 19 publications

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“…The difference in weight is about 0.5 kg which is insignificant as compared with the weight of ISI vehicle, which is around 80 kg. Considering manufacturing and material cost as per the current market price [6], PM motors becomes expensive option due to the presence of high temperature permanent magnets. The per unit cost of high temperature permanent magnet is about 12-20 USD which is much higher than conventional ferrite or alnico magnets.…”

Section: Weight and Costmentioning

confidence: 99%

“…The design of SR motor having torque, power, speed range and efficiency values competitive to those of PM motor has been investigated for hybrid electric vehicles in [5]. Comparison studies for SR and PM motors have also been carried for electric bicycles [6] and electric brakes [7]. However, the plausibility of replacing PM motor with SR motor for high temperature, space saving high torque density application is not reported and demands a thorough investigation of electromagnetic and thermal performances.…”

Section: Introductionmentioning

confidence: 99%

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Design and Performance Comparison of Permanent Magnet Brushless Motors and Switched Reluctance Motors for Extended Temperature Applications

K.S¹,

Murugan²

2018

PIER M

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Abstract-In-Service Inspection (ISI) plays a critical role in ensuring the safety and security of nuclear power plant and personnel. The limited access and high ambient temperature conditions impel the need for remote inspection techniques using semi automated vehicle. The electrical actuators driving the ISI robotic vehicle must satisfy the requirements of high operating temperature, high torque density, compact size and low weight. Currently, permanent magnet brushless motors are used due to its compact size and high efficiency. However, due to risk of demagnetization at high temperature as well as due to depleting resources of rare earth material alternate topologies without using permanent magnets shall be considered. This paper investigates the performance of Permanent Magnet (PM) brushless motor and Switched Reluctance (SR) motors for high temperature applications. SR motor is designed as per fundamental design equations satisfying the application requirements. Electromagnetic performance is verified by Finite Element Analysis (FEA) and thermal performance is verified by lumped parameter thermal analysis. Finally the performance of SR motor is compared with PM motor in terms of torque, efficiency, weight, cost and temperature rise.

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Section: Weight and Costmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design and Performance Comparison of Permanent Magnet Brushless Motors and Switched Reluctance Motors for Extended Temperature Applications

K.S¹,

Murugan²

2018

PIER M

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“…BLDC machines have higher torque ripples, however for e-bikes with a large mass inertia and high gearing ratios (acting as dampers to the pulsating torque) this is not concerning. SRMs have been studied as an alternative cheaper motor in e-bikes [6,[15][16][17]. Most of these studies have focused on optimizing the SRM design for maximum output torque, output power and efficiency [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

“…SRMs have been studied as an alternative cheaper motor in e-bikes [6,[15][16][17]. Most of these studies have focused on optimizing the SRM design for maximum output torque, output power and efficiency [15][16][17][18]. When the outer diameter of an e-bike motor is kept as a fixed parameter, and the SRM is optimized for its weight, it is shown that the BLDC motor has higher efficiency than SRM [16].…”

Section: Introductionmentioning

confidence: 99%

“…Most of these studies have focused on optimizing the SRM design for maximum output torque, output power and efficiency [15][16][17][18]. When the outer diameter of an e-bike motor is kept as a fixed parameter, and the SRM is optimized for its weight, it is shown that the BLDC motor has higher efficiency than SRM [16]. SRMs have potential to reach similar efficiency as permanent magnet machines if the motor topology is carefully designed [12,18,19].…”

Section: Introductionmentioning

confidence: 99%

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Efficient Energy Conversion in Electrically Assisted Bicycles Using a Switched Reluctance Machine Under Torque Control

Zaghari

Stuikys²,

Weddell

et al. 2020

IEEE Access

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The prospect of physical exertion commonly acts as a deterrent to the adoption of cycling for everyday transport. A battery powered assistance torque electric motor could alleviate such physical exertion by reducing the effort required by the cyclist. This study investigates the potential effectiveness, efficiency, and energy saving of electrically-assisted cycling when assistance torque of a switched reluctance motor is designed to vary in accord to the cyclist instantaneous torque at the pedal cranks. Specifically, the modulated motor assistance torque is delivered at the least efficient human input torque points on the cycle. For a representative short distance cycling schedule modulating the instantaneous torque of the on-board electric motor causes the electric energy expenditure to not exceed that of the assisted cycling mode of an identical constant-torque motor. Furthermore, for the same speed profile cycling journey with added road gradient and head wind resistance, the energy expenditure of the modulated torque motor is equal to the constant torque motor. These findings indicate significant improvements in the cycling experience. INDEX TERMS modulated cycling torque, energy conversion, electric bike, switched reluctance machine, battery.

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