Comparative Analysis of Partitioned Stator Flux Reversal PM Machine and Magnetically Geared Machine Operating in Stator-PM and Rotor-PM Modes

A high gear ratio flux switching permanent magnet machine (HFSPM) was proposed to improve the torque performance in flux switching permanent magnet machine (FSPM). Conventional FSPMs address flux bypass issue when designed with a high gear ratio. The HFSPM adopts a dual rotor structure to overcome this flux bypass issue. First, the cause and effect of flux bypass issue was discussed using a magnetic equivalent circuit (MEC). Further, the process of overcoming the flux bypass issue using dual rotor structure was discussed. An alternative HFSPM, consequent pole HFSPM (CP-HFSPM), was proposed to enhance torque performance. The CP-HFSPM was optimized for high torque performance and proper power factor.

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“…The gear ratio is defined as the ratio of the number of rotor iron poles Zr to that of the armature pole pairs Za, as described by Eq. (1) [15].…”

Section: A Conventional Fspm and Flux Bypass Issuementioning

confidence: 99%

High Gear Ratio Flux Switching Permanent Magnet Machine for High Torque Performance

2020

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“…The operation principle of PS-FRPM machines is to some extent similar to coaxial magnetic gears [3][4][5] or magnetically geared brushless PM machines [7,16]; their function is based on the modulation of the magnetic field by the iron-poles. Hence, in order to develop the maximum electromagnetic torque, the number of PM pole-pairs (P), the number of rotor iron poles ( r N ) and the number of armature pole-pairs ( s P ) must obey the following relation [4]:…”

Section: B Operation Principlementioning

confidence: 99%

“…By separating the armature winding and stationary PMs, the space for the PM and armature winding increases, the motor copper losses decrease, heat is easily dissipated, PMs are kept away from the winding high-temperature zone, and the risk of the PM demagnetization is reduced. Consequently, PS-FRPMM compared with the conventional FRM and conventional PM machines, shows better performance and higher torque density per copper losses [1,2], [6,7], [11][12][13][14][15][16][17]. Thierry Lubin is with the Groupe de Recherche en Electrotechnique et Electronique de Nancy, University of Lorraine, 54506 Nancy, France (e-mail: thierry.lubin@green.uhp-nancy.fr).…”

Section: Introductionmentioning

confidence: 99%

“…Thierry Lubin is with the Groupe de Recherche en Electrotechnique et Electronique de Nancy, University of Lorraine, 54506 Nancy, France (e-mail: thierry.lubin@green.uhp-nancy.fr). The analyses of the performance of PS machines have been done in [6,7], [11], [16,17]. PS machines are compared with stationary PM machines [7], [11,12] with different magnet topologies [13,14] and different winding configurations [15] based on finite element analyses and prototype.…”

Section: Introductionmentioning

confidence: 99%

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General Analytical Magnetic Model for Partitioned-Stator Flux-Reversal Machines With Four Types of Magnetization Patterns

Vahaj¹,

Rahideh²,

Lubin³

2019

IEEE Trans. Magn.

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 Abstract-A Partitioned Stator-Flux Reversal Permanent Magnet Machine (PS-FRPMM) is a new combination of a stator PM machine and a magnetically geared machine and has the specifications of both machines in terms of robust structure and torque density. In this paper a comprehensive 2-D analytical model is developed for PS-FRPMM based on subdomain technique. The presented model has the capability to accurately and quickly investigate the effects of design parameters on the machine performance. The 2-D analytical model is evaluated on two case studies with 12 stator teeth and 10 rotor poles, and 18 stator teeth and 13 rotor poles, with four different magnetization patterns. The influences of various design parameters such as the rotor slot width, slot opening width and the segment ratio of the PMs in the 2-segment magnetization pattern have been investigated on the quantities such as the instantaneous torque, torque ripple, Unbalanced Magnetic Force (UMF) and Electromotive Force (EMF). For evaluating the presented analytical model, 2-D Finite Element Method (FEM) with and without saturation effects has been used. The comparative study between the analytical and numerical models shows good agreement. Finally, a 3-D FEM has been used and the results of 2-D analytical model and 3-D FEM are compared in term of the accuracy and computational time. The results show that the presented model has lower computational time compared to the 2-D and 3-D FE method, while its accuracy is acceptable under different circumstances such as saturation.

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“…Based on the foregoing evolution from stator PM and wound field machines to PS-SF machine, Figs. 1 and 3, various PS-SF machine configurations can be developed [24,25,[81][82][83][84][85][86][87][88][89][90][91][92][93][94][95][96][97].…”

Section: Ps Switched Flux Machinesmentioning

confidence: 99%

Overview of novel magnetically geared machines with partitioned stators

Zhu

2018

IET Electric Power Applications

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This study overviews recent development of a new class of magnetically geared machine topologies, i.e. partitioned stator (PS) machines. They are developed from magnetic gears and magnetically geared machines, as well as stator permanent magnet (PM) machines (switched flux, flux reversal, and doubly saliency PM), wound field, or hybrid PM and field winding machines. Based on the operating principle, i.e. magnetic gearing effect/air-gap field modulation and flux switching by the salient rotor iron poles, various PS machine topologies are developed. All have features of two stators, two air-gaps, and one segmented ferromagnetic rotor identical to a magnetic gear's modulating rotor. Their inherent relationships are revealed, while their electromagnetic performance is compared. Both PM and wound field PS machines are discussed, together with hybrid excited PS-PM machines and Vernier machines. It shows that all of these PS machines share the same torque production principle and the differences are mainly in PM configurations and relative positions of two stators. All PS machines have higher torque density per copper loss compared with their counterparts of single-stator machines. PS switched flux PM machines can produce the highest torque density per copper loss. Note: G r is the gear ratio, n i is the number of iron pieces, p 1 is the low-speed element pole-pairs, p 2 is the high-speed element pole-pairs, ω i is the ferromagnetic pieces' angular velocity, ω 1 is the low-speed element's angular velocity, ω 2 is the high-speed element's angular velocity. The negative sign indicates opposite rotating directions.

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Comparative Analysis of Partitioned Stator Flux Reversal PM Machine and Magnetically Geared Machine Operating in Stator-PM and Rotor-PM Modes

Cited by 26 publications

References 48 publications

High Gear Ratio Flux Switching Permanent Magnet Machine for High Torque Performance

High Gear Ratio Flux Switching Permanent Magnet Machine for High Torque Performance

General Analytical Magnetic Model for Partitioned-Stator Flux-Reversal Machines With Four Types of Magnetization Patterns

Overview of novel magnetically geared machines with partitioned stators

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