Performance comparison of a spoke‐type PM motor with different permanent magnet shapes and the same magnet volume

Jun, Cha-Seung; Kwon, Byung-il

doi:10.1049/iet-epa.2016.0763

Cited by 26 publications

(9 citation statements)

References 26 publications

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“…The Taguchi optimisation algorithm can obtain the best solution though less simulation times. This algorithm can be simplified from 3 3 ¼ 27 simulation times to 9 simulation times to find the optimal solution. The target optimised design variables are expressed as α, β and W pm3 , respectively.…”

Section: Taguchi Optimisation Of Permanent Magnet Sizementioning

confidence: 99%

Performance analysis of asymmetrical less‐rare‐earth permanent magnet motor for electric vehicle

Shi

et al. 2021

IET Electrical Syst in Trans

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To reduce the manufacturing cost, the cogging torque and the torque ripple of the traditional V-shaped permanent magnet motor (TPMM), an asymmetrical less-rare-earth permanent magnet motor (ALREPMM) is proposed. An equivalent air-gap flux density model is established, the model is employed to calculate the analytical expression of the no-load back-EMF, and the multiple objectives optimisation are carried out for the motor parameters based on the Taguchi algorithm. Electromagnetic performance of the TPMM structure and the ALREPMM structure is compared by finite element method-based simulation. It is shown that the ALREPMM structure can reduce the amount of rareearth materials by 19%, and the cogging torque and the THD values of no-load back-EMF are reduced by 77.3% and 26.8%, respectively. Finally, a prototype is manufactured, thus verifying the rationality of the design of the ALREPMM structure through experiments.

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Section: Taguchi Optimisation Of Permanent Magnet Sizementioning

confidence: 99%

Performance analysis of asymmetrical less‐rare‐earth permanent magnet motor for electric vehicle

Shi

et al. 2021

IET Electrical Syst in Trans

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“…The rotor topologies used are the surface mounted PM rotor, capped PM rotor, and spoke PM. While there are many other topologies to choose from and variations on each of them, see e.g., [13][14][15][16]18,19,23,24], the three chosen topologies are all relatively simple. All three topologies allow the PM to be represented as a rectangular block with a well defined height and width, along and across magnetisation, respectively.…”

Section: Geometries and Rotor Topologiesmentioning

confidence: 99%

The Influence of Permanent Magnet Material Properties on Generator Rotor Design

Eklund

Eriksson

2019

Energies

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Due to the price and supply insecurities for rare earth metal-based permanent magnet (PM) materials, a search for new PM materials is ongoing. The properties of a new PM material are not known yet, but a span of likely parameters can be studied. This paper presents an investigation on how the remanence and recoil permeability of a PM material affect its usefulness in a low speed, multi-pole, and PM synchronous generator. Demagnetisation is also considered. The investigation is carried out by constrained optimisation of three different rotor topologies for maximum torque production for different PM material parameters and a fixed PM maximum energy. The rotor topologies used are surface mounted PM rotor, spoke type PM rotor and an interior PM rotor with radially magnetised PMs. The three different rotor topologies have their best performance for different kinds of materials. The spoke type PM rotor is the best at utilising low remanence materials as long as they are sufficiently resistant to demagnetisation. The surface mounted PM rotor works best with very demagnetisation resistant PM materials with a high remanence, while the radial interior PM rotor is preferable for high remanence materials with low demagnetisation resistance.interact with the demagnetisation magnetic flux density curve. Different rotor topologies have been studied previously. In [13], three topologies, similar to those studied here, are compared for use in 4-pole traction motors for trains. Similar topologies are compared for use as an aircraft starter-generator in [14]. Five different topologies, not including the spoke-type rotor, are compared in [15]. Ref. [16] also compares five different topologies, including the spoke-type rotor. Ref.[17] compares machines with Nd-Fe-B, Sm-Co and alnico for surface mounted 4-pole machines. Ref.[18] compares three machine configurations for interior v-shaped magnets for two different materials: the novel material NdFe 12 N x and a conventional Nd-Fe-B magnet. A spoke-type rotor with ferrites is compared to a rotor with surface mounted Nd-Fe-B magnets for a wind power generator in [19,20]. A comparison of demagnetization risk for the same generator types is presented in [21].The aim of this paper is to study how the magnetic properties of PM materials affect the machine design in low-speed radial flux PM generators. To our knowledge, there has not been any previous study combining material properties with rotor design and rotor topology choice. The results from this study could give hints on which property to improve when developing new PM materials as well as on the suitability of a material with certain magnetic properties for different generator topologies.

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“…Increasing the cross‐sectional area of the PMs within a limited rotor size is crucial for increasing the flux per pole of the PMSM. Components must also be arranged to prevent flux offset in the inserted PMs [15–17]. Therefore, merely combining SPM‐ and spoke‐type motors increases the cross‐sectional area of the PM, but does not increase the flux per pole [12].…”

Section: Comparison Of Improved Rotor Type and Three Rotor Typementioning

confidence: 99%

Improved rotor structures for increasing flux per pole of permanent magnet synchronous motor

Kim

Moon

2018

IET Electric Power Applications

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This study proposes an improved rotor structure that can increase the flux per pole of a permanent magnet synchronous motor. The air-gap flux density of the improved rotor-type motor is calculated using an equivalent magnetic circuit and compared with the calculation result that is obtained using finite element analysis (FEA). In addition, the no-load fundamental air-gap flux density of the surface-mounted permanent magnet motor, interior permanent magnet motor, spoketype motor, and improved rotor-type motor are compared using FEA. Changes in the no-load fundamental air-gap flux density according to changes in the rotor diameter and permanent magnet usage are examined for each rotor type. A comparison of the fundamental air-gap flux densities of the five rotor types, including the improved rotor-type conducted using FEA demonstrated that the air-gap flux density of the improved rotor-type was highest. A comparison of the no-load phase back EMF of the five types was conducted after designing them in the four-pole six-slot structure. Each rotor type is applied to 80 W-grade fan motors, and the torque ripple and iron loss are compared. A prototype of the improved rotor-type motor is developed, and the no-load phase back EMF and load test result are verified through experiments.

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Performance comparison of a spoke‐type PM motor with different permanent magnet shapes and the same magnet volume

Cited by 26 publications

References 26 publications

Performance analysis of asymmetrical less‐rare‐earth permanent magnet motor for electric vehicle

Performance analysis of asymmetrical less‐rare‐earth permanent magnet motor for electric vehicle

The Influence of Permanent Magnet Material Properties on Generator Rotor Design

Improved rotor structures for increasing flux per pole of permanent magnet synchronous motor

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