Analytical Modeling and Optimization of Partitioned Permanent Magnet Consequent Pole Switched Flux Machine With Flux Barrier

Abstract

Switched Flux Permanent Magnet Machine (SFPMM) encompass unique features of conventional direct current machine, permanent magnet (PM) synchronous machine and switch reluctance machine therefore, applicable for high-speed applications. However, conventional SFPMM exhibits demerits of high PM volume (𝑉 𝑃𝑀 ), high torque ripples (𝑇 𝑟𝑖𝑝 ), higher cogging torque (𝑇 𝑐𝑜𝑔 ), lower torque density (𝑇 𝑑𝑒𝑛 ) and significant stator flux leakage. In this paper, a new topology of consequent pole (CP) SFPMM (CPSFPMM) is proposed having partitioned PM that improved flux modulation phenomena utilizing flux barriers. Moreover, due to non-linear behaviour of PM and complex stator structure alternate analytical sub-domain model is utilizes for initial design. However, initial design offers lower open-circuit phase flux linkage (𝛷), average mechanical torque (𝑇 𝑎𝑣𝑔 ) and 𝑇 𝑑𝑒𝑛 . Aforementioned electromagnetic key performance indicator with 𝑇 𝑐𝑜𝑔 , 𝑇 𝑟𝑖𝑝 , total harmonics distortion in 𝛷 (𝛷 𝑇𝐻𝐷 ), average power (𝑃 𝑎𝑣𝑔 ) and power density (𝑃 𝑑𝑒𝑛 ) are refined utilizing Geometric-Based Deterministic Optimization (GBDO). Analysis reveals that proposed new topology of CPSFPMM with flux barriers reduces 𝑇 𝑐𝑜𝑔 by 34.90%, 𝑇 𝑟𝑖𝑝 by 20.27%, 𝛷 𝑇𝐻𝐷 by 28.08% whereas it enhanced 𝑃 𝑎𝑣𝑔 by 17.79%, 𝑇 𝑑𝑒𝑛 and 𝑃 𝑑𝑒𝑛 by 34.38%.

Design and Experimental Validation of a New Outer Rotor Double PM Excited Flux Switching Generator for Direct Drive Wind Turbines

“…or PMs [7,8]. In the conventional topologies of FSPM machines, both the armature windings and the excitation system are located on the stator structure, and significant amounts of PMs are usually used in their structure [9,10].…”