Torque performance in Novel H-type Modular Stator Consequent Pole Permanent Magnet Machine with 3rd harmonic shaped rotor

In comparison with surface-mounted permanent magnet synchronous machines (SPMSM), consequent pole SPMSM (CP-SPMSM) reduce permanent magnet volume to half however, magnetic circuit in CP machines are un-balanced between iron pole and PM pole which results significant harmonics in magnetic flux density which contributes to cogging torque $\left(T_{\operatorname{cog}}\right)$ and torque ripple $\left(T_{r i p}\right)$ leading to acoustic noise and vibration. To over the aforesaid demerits in CP-SPMSM, in this paper a novel H-type modular stator CP machine is proposed, and 3
^rd
order harmonic shaped rotors are thoroughly investigated for average torque $\left(T_{avg}\right)$ improvement and suppression of $T_{\operatorname{cog}}$ and T
rip
. For this purpose, sin shape, sin + 3
^rd
order harmonic, inverse cosine and inverse cosine with 3
^rd
order harmonic is investigated. Analysis reveals that using 3
^rd
harmonic shaped rotor, harmonic content of back-EMF is curtailed by 15.78%, intensify flux linkage T
rip
to 8.1 %, increase T
avg
up to 12.34 %, repressed $T_{\operatorname{cog}}$ up to 75.27 % and diminish T
rip
up to 73.56 % when compare with initial rotor structure.