Analysis of the stator topology impact on cogging torque for surface permanent magnet motor

Petkovska, Lidija; Cvetkovski, Goga; Lefley, Paul

doi:10.1108/compel-08-2014-0213

Cited by 13 publications

(6 citation statements)

References 14 publications

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“…This torque is an important drawback of PM motors, in general. The cogging torque profile and the respective peak-value depend on many different factors and to mitigate them is certainly a big challenge (Petkovska et al, 2015(Petkovska et al, , 2020. For the proposed SPPM motor the cogging torque characteristic is computed by 2D magnetostatic FEM, when the only excitation is by permanent magnet rotor, while the rotor position is changing from 0°to 360°, with a step of 10°.…”

Section: Performance Analysismentioning

confidence: 99%

Investigation of shaded pole stator topology for low power AC motors design

Petkovska,

Cvetkovski

2024

COMPEL

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Purpose This paper aims to investigate the features of single phase shaded pole stator with squirrel–cage rotor or permanent magnet rotor, that leads to an investigation of these topoloties as induction motor or synchronous motor. The comparative analysis is realised for the following three topologies: single phase shaded pole induction motor (SPIM) with squirrel–cage rotor, the second topology (single phase synchronous motor) has the same stator configuration but with permanent magnet rotor and the third investigated topology is similar to the second one, where the stator poles instead of iron steel are made of soft composite material. Design/methodology/approach The investigation in this work starts with a performance analysis of single-phase SPIM. Afterwards for the same stator topology the squirrel rotor is replaced with a two-pole permanent magnet rotor and the same performance analysis is realised for this topology. Finally, the second topology is improved bay replacing the iron steel stator poles with stator poles made of soft magnetic composite material and performance analysis is realised for this third type of topology as well. The performance analysis of all topologies is realised by implementation of finite element method and finite element analysis. Findings The presented data and diagrams from the realized investigation show that single phase synchronous motor with shaded pole stator has an improved characteristics in comparison with the initial single-phase SPIM. Finally, the third topology realized on the bases of the single-phase synchronous motor has the best performance characteristics due to the implementation of soft magnetic material in the realization of the stator poles. The proposed methodology for structural and performance improvement of a single-phase SPIM topology opens the possibility for additive manufacturing application and significant cost reduction. Originality/value The focus was put on exploration the possibilities of the single-phase shaded pole stator topology for application in low-power and low-cost single phase self-starting motors. By simple replacement of the squirrel–cage rotor, in the reference AKO-16 motor, with one-piece ferrite permanent magnet rotor, the self-starting single phase synchronous motor was derived. In the next step, owing to simplify the SPPM motor production process and manufacturing, the stator poles instead of iron steel lamination were made of soft composite material Somaloy®. It opens the possibility for additive manufacturing application and significant cost reduction.

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Section: Performance Analysismentioning

confidence: 99%

Investigation of shaded pole stator topology for low power AC motors design

Petkovska,

Cvetkovski

2024

COMPEL

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“…This approach greatly simplifies the computation of torques and gives the most accurate results, as compared to line integration to calculate Maxwell stress tensor, or to application of energy concept and numerical differentiation of the air-gap magnetic coenergy. In order to achieve closer estimation of torques, the mesh density in the air gap, where the Maxwell stress is the highest, is particularly refined (Petkovska et al, 2015). The FEM simulations start at no-load, without current in stator windings, when the magnetic field is induced only by the permanent magnets and the cogging torque is computed.…”

Section: Electromechanical Characteristicsmentioning

confidence: 99%

Study of the performance characteristics of a surface permanent magnet motor at various magnetization patterns

Petkovska

Cvetkovski

Lefley

2016

COMPEL

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Purpose -In the present paper the influence of magnetization patterns of the rotor magnets on the performance characteristics for surface permanent magnet (SPM) motor is investigated. The objective is to show how the electromagnetic and electromechanical characteristics of this type of motor can be significantly changed by applying various magnetization patterns of permanent magnets placed on the rotor surface. Design/methodology/approach -At the beginning a survey of possible and most frequently used magnetization patterns for permanent magnet motors is presented. The research is focussed on the comparison of performance characteristics and is developed into three levels. It is started with a conventional SPM motor having segmented permanent magnets, and two magnetization patterns are considered: parallel and radial. Showing no significant difference of the motor performance at parallel and radial magnetization, for further investigation only radial magnetization, being more conventional, is considered. In the second step, the counterparts of SPM with two Halbach array configurations, under the constraint of fixed magnet volume, are studied. Finally, detailed comparative analyses of SPM at radial, Halbach 1 and Halbach 2 magnet patterns are presented. Advantages and drawbacks for suggested magnet configurations are discussed. Findings -It is presented how the magnetization pattern of the rotor permanent magnets can have a substantial impact on the SPM motor performance characteristics. From the analysis of magnetic field properties at various types of magnetization, it is observed that both shape and rates of the characteristics, for radial magnetization and Halbach 2 configuration, exhibit similar features. It is due to the fact that Halbach 2 array cancels magnetic flux above the permanent magnets, i.e. strengthens the magnetic field in the rotor, and enhances the coupling between the rotor and stator magnetic field. It is worth to emphasise, that due to less saturation of the magnetic core and lower iron loss at Halbach 1 and Halbach 2 magnetization, it is possible to increase armature current and consequently to increase the electromagnetic torque. This fact could be interesting for further research. Originality/value -The paper presents an original comparative analysis for performance characteristics of a surface permanent motor at various magnetization patterns. The novelty of the paper is seen in the introduction of two Halbach magnetization array for permanent magnets and improvement of the performance characteristics for the analysed motor.

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“…The permanent magnet structure used for the PMG proposed have been adopted to be bread loaf type. According [13], many commercially available machine drives, the typically cogging torque from 5 to 15% from the rated torque of the machine. And, due to the imperfection of manufacturing in mass production, the CT of machine may be increase more than 25 % even it has been introduced a properly design permanent magnets.…”

Section: Introductionmentioning

confidence: 99%

Effect of Combining of Shaping at Magnet Edge and Dummy Slotting at Stator Core on the Cogging Torque Reduction in Permanent Magnet Generator

Lucio Alfreido Correira,

Nur,

Duma K Y Hutapea

2024

jurnalelektro

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Effect of combining the shaping at magnet edge and dummy slotting at stator on the cogging torque reduction in permanent magnet generator was studied. The cogging torque is the most issues in permanent magnet generator application, since it effects to reduce the generator performance. A permanent magnet generator with 24 slots and 20 poles structure is presented. For purpose of study, in the beginning the permanent magnet generator with conventional structure has been investigated as the basic reference of initial structure. In order to improve the performance of the permanent magnet generator, the magnet edge was shaped but the stator core is kept remain conventional structure. It can be found that the magnet edge effects to inprove a little bit of the performance of the permanent magnet generator. In the next investigation, the magnet edge slotting and dummy slotting in stator core of the permanent magnet generator was combined. Using the FEMM 4.2, the cogging torque value of the proposed of permanent magnet generator were analysed and compared. It was found that cogging torque reduction of the permanent magnet generator with combining the dummy slotting at stator core and magnet edge shaping can reduce the cogging torque from 0.0028554 N.m (intial base line) to 0.0000165 N.m (proposed model). In other word, the cogging torque can be to around 99.42 % compared with the base line. The magnet flux density at core of the permanent magnet generator proposed can be reduced to 35 %.

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Analysis of the stator topology impact on cogging torque for surface permanent magnet motor

Cited by 13 publications

References 14 publications

Investigation of shaded pole stator topology for low power AC motors design

Investigation of shaded pole stator topology for low power AC motors design

Study of the performance characteristics of a surface permanent magnet motor at various magnetization patterns

Effect of Combining of Shaping at Magnet Edge and Dummy Slotting at Stator Core on the Cogging Torque Reduction in Permanent Magnet Generator

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