Design and Analysis of an Asymmetric Spoke and Delta-Shape Interior Permanent Magnet Synchronous Machine

This paper proposes a design of an asymmetric spoke and delta-shape interior permanent magnet (AIPM-P) synchronous machine for electric vehicles that use the magnetic-field-shifting (MFS) technique to improve the average torque and reduce torque ripples. The asymmetry of the AIPM-P is due to the asy...

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Bibliographic Details
Published in:IEEE access 2023-01, Vol.11, p.1-1
Main Authors: Muhammad, Niaz, Khan, Faisal, Ullah, Basharat, Tariq, Saira, Milyani, Ahmad H.
Format: Article
Language:English
Subjects:
asymmetric interior PM cavity
Asymmetric rotor
Asymmetry
Circuits
Core loss
delta and spoke type PM
Electric vehicles
Inductance
Magnetic flux
Magnetic multilayers
magnetic-field-shifting
Optimization
Permanent magnets
Reluctance
Reluctance motors
Rotors
Synchronous machines
Topology
Torque
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Summary:This paper proposes a design of an asymmetric spoke and delta-shape interior permanent magnet (AIPM-P) synchronous machine for electric vehicles that use the magnetic-field-shifting (MFS) technique to improve the average torque and reduce torque ripples. The asymmetry of the AIPM-P is due to the asymmetric rotor structure, asymmetric permanent magnet (PM) placement, and asymmetric flux barriers (AFB). Due to this asymmetry, the MFS is utilized, which decreases the current angle difference between the peak PM (TPM) and reluctance torque ( T r ) components. In the delta-Shape, the bar magnet helps reduce the d-axis inductance, which helps in increasing the reluctance torque, ultimately increasing synthetic torque. Furthermore, the combination of delta-shape and spoke shape makes the novel hybrid layer structure that improves the average torque. The proposed AIPM-P is then compared with the conventional designs in the literature having the same stator and rotor radius, with a 4-pole and 24-slot combination. The open circuit, on-load characteristics, efficiency, copper, and iron loss maps of the proposed and conventional designs are investigated and compared. Compared to the conventional designs, the proposed AIPM-P synchronous machine has high efficiency and a good torque profile, which is suitable for EV applications.
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2023.3280856