The Design for Cogging Force Reduction of a Double-Sided Transverse Flux Permanent Magnet Linear Synchronous Motor

Shin, Jung-Seob; Watanabe, Rikiya; Koseki, Takafumi; Kim, Houng-Joong; Takada, Yasuhiro

doi:10.1109/tmag.2014.2322657

Cited by 14 publications

(6 citation statements)

References 5 publications

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“…With this volume, a rated thrust of 243.1 N is designed using the simplified design method proposed in [6], which is a useful method for maximum thrust design in the designed volume. In addition, a skew of 10°was applied to the DSTF-PMLSM for further cogging force reduction in the nine core-ten pole combination [7]. There was good agreement between 3-D FEM value and empirical value measured using a load cell at different mover positions when DC current was applied to the armature coil.…”

Section: Verification Of the Feasibility Of The Proposed Design Amentioning

confidence: 81%

Practical Design Approach of a Transverse Flux Linear Synchronous Motor for Compact Size, Small Mover Weight, High Efficiency, and Low Material Cost

et al. 2015

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This paper presents a practical design approach of a transverse flux (TF) linear synchronous motor. It is useful in the selection of appropriate volume as a starting point of the thrust requirement design to achieve compact size, small mover weight, high efficiency, and low material cost during the preliminary design stage. First, the concept of the proposed design approach is described. Second, the volume design of a double-sided TF (DSTF) permanent magnet linear synchronous motor (PMLSM) proposed in a previous work is conducted. Finally, based on the experimental results of the prototype model, the feasibility of the proposed design approach is verified by comparing the performance of the DSTF-PMLSM designed using the volume obtained by the proposed design approach with that of the other recent proposals.Index Terms-Linear synchronous motor, practical design approach, transverse flux (TF) machine.

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Section: Verification Of the Feasibility Of The Proposed Design Amentioning

confidence: 81%

Practical Design Approach of a Transverse Flux Linear Synchronous Motor for Compact Size, Small Mover Weight, High Efficiency, and Low Material Cost

et al. 2015

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“…But, this method is mainly related to complex algorithms and controllers and not considered in this paper. The other type for the reduction of the detent force is to optimize the structure of the machine, including secondary [8][9][10] and primary parts [11][12][13][14][15][16][17]. For example, several methods including chamfering, skewing, and magnet pole shifting were applied for detent force reduction [8].…”

Section: Introductionmentioning

confidence: 99%

Detent Force Minimization of Double-Sided Permanent Magnet Linear Synchronous Machine with 120° Phase Belt Toroidal Windings by Slot-Shift Structure

Chai

Nie

et al. 2022

Energies

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Double-sided permanent magnet linear synchronous machine with 120° phase belt toroidal windings (120°-TWDSPMLSM) suffers from large detent force due to the end effect and slot effect. Many existing methods can reduce the detent force of the 120°-TWDSPMLSM effectively. But they also minimize the back electromotive force (back-EMF) and thrust simultaneously. To alleviate this problem, this paper adopts a method of combining slot-shift structure with rearranging the 120° phase belt toroidal windings (120°-TW) to suppress the detent force and improve the back-EMF and thrust of the 120°-TWDSPMLSM simultaneously. First, the slots on the two sides of the primary part are stagger by an optimal distance to reduce the detent force. The models of the detent force, including the end force and cogging force, is established theoretically, and then verified by finite-element analysis (FA). Then, the 120°-TW are rearranged to improve the back-EMF and average thrust. And the electromagnetic characteristics of the 120°-TWDSPMLSM under different shifted distances are analyzed and compared in detail. Finally, the result shows that the detent force of optimized machine is 70.19% lower than that of the original machine, and the thrust fluctuation reduces 19.21%. Besides, the back-EMF of optimized machine is 6.84% lower than that of the original machine, but 31.86 higher than the machine with shifting slots and without rearranging the 120°-TW. Therefore, the optimal method in this paper is available in the detent force reduction and thrust improvement of the 120°-DSPMLSM.

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“…The first caused by stator slotting and the next caused by PMs. There are several techniques of cogging thrust minimisation in PM motors, such as optimal shaping of slots or PMs [13][14][15][16][17], skewing of slots or PMs [16][17][18][19], and use of modular PMs [20]. Some of these techniques lead to an increase in the manufacturing cost of the machine; others result in a decrease in the average thrust.…”

Section: Introductionmentioning

confidence: 99%

Cogging force mitigation techniques in a modular linear permanent magnet motor

Tootoonchian

Nasiri‐Gheidari²

2016

IET Electric Power Applications

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Modular linear doubly salient permanent magnet motors are well adapted to linear propulsion systems because of their distinct characteristics, such as high efficiency and power density, reduced maintenance and initial cost, low noise and permanent magnet (PM) leakage flux, and fault tolerance capability. However, such motors suffer from high cogging thrust. In this study, various techniques based on previously proposed methods for PM machines are applied on the studied motor and evaluated by using non-linear three-dimensional time-stepping finite element analysis; three novel, optimised techniques are then presented. The techniques presented are based on the minimisation of the variation in air-gap reluctance relative to the displacement. The PM volume and average air-gap length are kept constant in all optimisations. Since the average thrust and thrust ripples under load condition may be affected by cogging reduction techniques, these values are presented for all given techniques. The results show that the proposed techniques not only maintained the average thrust under various loads but also significantly suppressed the thrust ripples for different average thrusts and cogging forces.

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The Design for Cogging Force Reduction of a Double-Sided Transverse Flux Permanent Magnet Linear Synchronous Motor

Cited by 14 publications

References 5 publications

Practical Design Approach of a Transverse Flux Linear Synchronous Motor for Compact Size, Small Mover Weight, High Efficiency, and Low Material Cost

Practical Design Approach of a Transverse Flux Linear Synchronous Motor for Compact Size, Small Mover Weight, High Efficiency, and Low Material Cost

Detent Force Minimization of Double-Sided Permanent Magnet Linear Synchronous Machine with 120° Phase Belt Toroidal Windings by Slot-Shift Structure

Cogging force mitigation techniques in a modular linear permanent magnet motor

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