Detent Force, Thrust, and Normal Force of the Short-Primary Double-Sided Permanent Magnet Linear Synchronous Motor With Slot-Shift Structure

Huang, Xuzhen; Ji, Tianpeng; Li, Liyi; Zhang, Bo; Zhang, Zhuoran; Gerada, David; Gerada, Chris

doi:10.1109/tec.2019.2915821

Cited by 50 publications

(18 citation statements)

References 29 publications

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“…Apart from the previously cited phase unbalance and flux density reduction, the end effect is also source of an additional thrust force ripple component known as end force or end effect force in LPMSMs. This force affects them even at no load condition [75], [90], [93].…”

Section: Linear Permanent Magnet Machinesmentioning

confidence: 99%

“…Depending on the relative position between the primary and the secondary parts, the magnets on one side or another will attract the machine ends with more strength, generating the end effect ripple. The no load thrust ripple, also known as detent force, is the result of the sum of the conventional slot effect or cogging force and the end effect force [90], [93], [179]. As LPMSMs have to deal with multiple detent force ripple sources, several different solutions have been tested in order to reduce the open-circuit thrust pulsation, e. g. skewing magnets, adjusting the primary length, and slot shifting [69], [81], [85], [93].…”

Section: Linear Permanent Magnet Machinesmentioning

confidence: 99%

“…The performance of a segment-shifted machine can be improved with a rearrangement of the windings [90], [92], [93]. As the average thrust force is reduced with the increase of phase or pole shifting distance, the authors suggest that rearranging the winding configuration in the different primary sides can be a good solution for reducing the detent force without losing any force production capability.…”

Section: Linear Permanent Magnet Machinesmentioning

confidence: 99%

“…Segment-shifting [85], [90], [93] has also been proven to be effective in the reduction of the end-effect force. Moreover, if the windings are rearranged, the reduction of the EMF can be compensated [90], [93].…”

Section: B Thrust Force Ripplementioning

confidence: 99%

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Linear Machines for Long Stroke Applications—A Review

et al. 2020

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This document reviews the current state of the art in the linear machine technology. First, the recent advancements in linear induction, switched reluctance and permanent magnet machines are presented. The ladder slit secondary configuration is identified as an interesting configuration for linear induction machines. In the case of switched reluctance machines, the mutually-coupled configuration has been found to equate the thrust capability of conventional permanent magnet machines. The capabilities of the so called linear primary permanent magnet, viz. switched-flux, flux-reversal, doubly-salient and vernier machines are presented afterwards. A guide of different options to enhance several characteristics of linear machines is also listed. A qualitative comparison of the capabilities of linear primary permanent magnet machines is given later, where linear vernier and switched-flux machines are identified as the most interesting configurations for long stroke applications. In order to demonstrate the validity of the presented comparison, three machines are selected from the literature, and their capabilities are compared under the same conditions to a conventional linear permanent magnet machine. It is found that the flux-reversal machines suffer from a very poor power factor, whereas the thrust capability of both vernier and switched-flux machines is confirmed. However, the overload capability of these machines is found to be substantially lower than the one from the conventional machine. Finally, some different research topics are identified and suggested for each type of machine.

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Section: Linear Permanent Magnet Machinesmentioning

confidence: 99%

Section: Linear Permanent Magnet Machinesmentioning

confidence: 99%

Section: Linear Permanent Magnet Machinesmentioning

confidence: 99%

Section: B Thrust Force Ripplementioning

confidence: 99%

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Linear Machines for Long Stroke Applications—A Review

et al. 2020

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“…The end forces combined with the cogging forces result in detent forces. The detent force can be approximated as a sum of sine-functions with periodicities depending on the different force components [4,10]. In the generator presented in [11], the three phases were separated into different stator packages.…”

Section: Introductionmentioning

confidence: 99%

End Effects and Geometric Compensation in Linear Permanent Magnet Synchronous Generators with Different Topologies

Sjölund

Frost

Leijon

et al. 2021

Designs

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Electricity production from ocean waves with different solutions is a topic of major research interest. Many of such designs are based on linear generators that inherently introduce end forces. In this paper, detent force using Maxwell Stress Tensor and induced voltage is initially investigated for two different winding patterns for a generator topology with buried magnets in a finite element software. Two ways of overcoming the end forces are further examined: the first method reduces the magnetic flux variations of the translator between stator and air. The second method aims at countering the end forces at both ends for full active stator area. A comparison is then made between buried and surface-mounted topologies for the second end effect compensation method. Both no-load and load conditions are investigated in the comparison. The end effect compensation shows promising results for both topologies. Some clear similarities of the extended stator used to counter the end forces are also apparent, where the stator extensions completely cover the outer poles of both topologies. The results also indicate a longer full active stator area for the buried topology for the same pole-pitch and stroke length, resulting in a higher average voltage for partial stator overlap.

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Analysis of a Novel Consequent‐Pole Dual‐Stator Linear Permanent Magnet Vernier Machine Employing Mover Slot PM

Wang,

Li,

et al. 2024

IEEJ Transactions Elec Engng

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This paper proposes a novel consequent‐pole dual‐stator linear permanent magnet vernier machine (DS‐LPMVM) with PM in the mover slot opening, which has a bi‐directional flux modulation effect. The novelty of the proposed machine consists of consequent‐pole double‐sided topology with toroidal windings placed in the mover slot, as well as PMs both on the stator and mover slot to improve the air gap magnetic field. The dual‐stator adopts misalignment structure to suppress detent force and produce steady thrust. The electromagnetic parameters of the proposed DS‐LPMVM are evaluated and quantitatively compared with the conventional linear permanent magnet vernier machine (C‐LPMVM) in terms of air‐gap flux density, no‐load back EMF, inductance, and thrust. The geometrical parameters are designed to reduce the detent force. By analyzing the optimized structure parameters of the two machines, the good electromagnetic performances of the proposed machine are verified by the finite element method (FEM) and semi‐analytical method, and both results of the two methods are basically the same. It is found that the amount of PMs for the proposed machine is reduced by 20% compared to the C‐LPMVM, but the average thrust is increased by 20.7% and the thrust ripple is reduced to 4.04%. The results show that the proposed DS‐LPMVM has better flux modulation effect and thrust characteristics than C‐LPMCM. Finally, a 12‐slot, 10‐pole pairs prototype was manufactured and tested. © 2024 Institute of Electrical Engineers of Japan and Wiley Periodicals LLC.

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Detent Force, Thrust, and Normal Force of the Short-Primary Double-Sided Permanent Magnet Linear Synchronous Motor With Slot-Shift Structure

Cited by 50 publications

References 29 publications

Linear Machines for Long Stroke Applications—A Review

Linear Machines for Long Stroke Applications—A Review

End Effects and Geometric Compensation in Linear Permanent Magnet Synchronous Generators with Different Topologies

Analysis of a Novel Consequent‐Pole Dual‐Stator Linear Permanent Magnet Vernier Machine Employing Mover Slot PM

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