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Investigation of third harmonic utilization for torque performance improvement in novel H-type modular stator consequent pole machine

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In comparison with surface-mounted permanent magnet synchronous machines (SPMSM), inset permanent magnet consequent pole synchronous machine (IPMCPSM) reduce permanent magnet volume to half; however, magnetic circuit in consequent pole (CP) machines are un-balanced between iron pole and PM pole which results significant harmonics in magnetic flux density which contributes to torque ripple (\(T_{\rm{rip}}\)) and cogging torque (\(T_{\rm{cog}}\)) leading to vibration and acoustic noise. To overcome the above-mentioned shortcomings, this paper proposes a novel H-type modular stator IPMCPSM is proposed, and 3rd order harmonic shaped rotors are thoroughly investigated for average torque (\(T_{\rm{avg}}\)) improvement and suppression of \(T_{\rm{cog}}\) and \(T_{\rm{rip}}\). For this purpose, sin shape, sin+3rd order harmonic, inverse cosine and inverse cosine with 3rd order harmonic are investigated. Analysis reveals that using 3rd harmonic shaped rotor, harmonic content of back-EMF is curtailed by 35.93%, intensify flux linkage up to 2.9%, increase \(T_{\rm{avg}}\) up to 10.24%, repressed \(T_{\rm{cog}}\) up to 75.27% and diminish \(T_{\rm{rip}}\) up to 73.56% when compare with initial rotor structure.

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Correspondence to Wasiq Ullah.

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Ullah, W., Khan, F., Ullah, N. et al. Investigation of third harmonic utilization for torque performance improvement in novel H-type modular stator consequent pole machine. Electr Eng 104, 2703–2715 (2022).

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