Torque Ripples Reduction and Performance Analysis of Electrically Excited Flux Switching Motor

Bakhtiar Khan,Shahid Hussain,Wasiq Ullah,Faisal Khan,Basharat Ullah

doi:10.1109/access.2022.3140315

Bakhtiar Khan, Shahid Hussain + Show 3 more

Open Access

https://doi.org/10.1109/access.2022.3140315

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Abstract

Torque ripples cause acoustic noise, fluctuation in speed, vibration, and reduce lifetime of the motor. The double salient structure of Flux Switching Motor (FSM) has a high air-gap permeance variation that produces high torque ripples. This paper presents an analytical model to reduce air-gap permeance variation and torque ripples of the proposed octane modular stator 8slots-6poles single-phase Electrically Excited (EE) FSM. Furthermore, the rotor pole shaping technique is used to minimize the air-gap permeance variation and therefore, torque ripples of the proposed design are reduced. The electromagnetic performance of EEFSM is analyzed via the Finite Element Analysis (FEA) method. For the proposed design magnetic flux harmonics are reduced by 71% and back-EMF harmonics are suppressed by 48.5%. Torque ripples of the proposed EEFSM are reduced by 20%, cogging torque is diminished by 42.7% and average torque is enhanced by 5.8%. Finally, the prototype is fabricated and tested experimentally. Calculated values and experimental results are in good agreement and the difference is 3.5%-5%.

Highlights

The focus of research activities in advanced motors is high torque density, high power density, high efficiency, robust rotor structure, low noise and low cost [1]–[3]
Magnetic flux harmonics for the proposed design are reduced by 71% and back-EMF harmonics are minimized by 48.5%
Analytical model was presented for the proposed octane modular stator Excited Flux Switching Motor (EEFSM) design to minimize air-gap permeance variation and reduce the torque ripples

Summary

INTRODUCTION

The focus of research activities in advanced motors is high torque density, high power density, high efficiency, robust rotor structure, low noise and low cost [1]–[3]. The magnetic flux of the Electrically Excited Flux Switching Motor (EEFSM) is controlled electronically, with an increase in temperature performance of EEFSM is not affected and its overall cost is low compared to the PMFSM. Overlapped windings produce high copper losses and segmented rotors cannot be used for high-speed applications. EEFSM has 9% higher CSFF than the conventional designs It has a salient pole rotor and can be used for high-speed applications [22]. The forward non-overlapped windings of the octane modular stator EEFSM has a low copper loss. It can be unfolded for coil placement, maintenance and transportation.

PROPOSED TOPOLOGY AND ANALYTICAL MODEL

DISCUSSION

Findings

PROTOTYPE AND EXPERIMENTAL RESULTS

CONCLUSION