Cogging force reduction for the linear flux-switching permanent magnet machines based on a twisted stator

Hao, Wenjuan; Deng, Zhiquan; Wang, Yu

doi:10.1109/icems.2015.7385212

Cited by 3 publications

(3 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In Ref. [25], a twisted stator that contains two parts is investigated to reduce the detent force, and the detent force could be reduced by about 50% and 60% for two different schemes. Adopting a double-sided structure is an effective method to reduce the detent force.…”

Section: Introductionmentioning

confidence: 99%

A new design approach for reduction of force ripple in permanent magnet flux‐switching linear motor

Zhang

Wang

Chen

2023

IET Electric Power Appl

View full text Add to dashboard Cite

To reduce the force ripple of the permanent magnet flux‐switching linear motor (PMFSLM), a new design approach is suggested by the authors. The detent force is redefined as the composite force of the thrust of the single action of permanent magnet and armature current. In the design approach, both the improved E‐shaped PMFSLM primary module and secondary contain two units. The magnetisation direction of the permanent magnet in the two primary module units is opposite, but the two units share the same armature coil. The two units design eliminates the even number harmonics of the phase back‐EMF and decreases the period of detent force. Through the design of the skewed secondary, the detent force is eliminated completely, and simultaneously, the odd‐order harmonics are significantly weakened. The results of finite element analysis (FEA) show that the force ripple of the PMFSLM decreases significantly. Prototype experimental results are in good agreement with FEA results. The study results verify the effectiveness and practicability of the new design approach of PMFSLM for reducing the force ripple.

show abstract

Section: Introductionmentioning

confidence: 99%

A new design approach for reduction of force ripple in permanent magnet flux‐switching linear motor

Zhang

Wang

Chen

2023

IET Electric Power Appl

View full text Add to dashboard Cite

show abstract

“…As linear motors, FSPMLM and PMLSM both suffer from detent force, so some methods to reduce detent force used in PMLSM can also be used in FSPMLM. The existing methods can be classified into two types: one is the control strategies of machines [10][11][12][13][14], and the other is the optimization of the machine structure [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30].…”

mentioning

confidence: 99%

“…[23] reduces the cogging force by slot effect of double-sided FSPMLM by asymmetry distribution of stator teeth, but the end effect is not taken into account. An FSPMLM topology with twisted stator is proposed in [24] and the optimal twisted angle is selected according to the cogging force, but the flux leakage between two stators is inevitable in spite of the existence of flux barrier. The idea of primary modularization is used both in the PMLSM [25] and in the FSPMLM [26] to reduce detent force.…”

mentioning

confidence: 99%

Reduction of the Detent Force in a Flux-Switching Permanent Magnet Linear Motor

Zhao

Mou

Guo

et al. 2019

IEEE Trans. Energy Convers.

View full text Add to dashboard Cite

In this paper, the detent force caused by the end effect in a flux-switching permanent magnet linear motor (FSPMLM) with 6 slots and 5 poles is investigated and reduced by two different methods. Firstly, the detent force is diminished by adjusting the position of end teeth of primary side and injecting compensation current into compensation windings wound around the end teeth. Based on the linear relationship between compensation current and compensation force, the proper compensation current is derived and analyzed. Then, to avoid the magnetic coupling between compensation windings and phase windings, a novel compensation module with independent magnet circuit is presented and attached to the primary side of FSPMLM. Thirdly, the two detent force reduction methods are compared with each other, and the compensation module is proved to be more effective. Finally, a prototype of FSPMLM with compensation modules is manufactured and tested to validate the proposed compensation method. Index Terms-Flux-switching linear permanent magnet motor (FSPMLM), detent force, compensation coil, compensation module. I. INTRODUCTIONINEAR MOTORS possess several advantages such as rapid dynamic response, high precision, excellent reliability and quiet operation. Therefore, this kind of motor is greatly required in the occasions where linear motion is needed, such as rail transit, ropeless elevator, and electromagnetic launch [1][2][3][4][5]. However, for the applications demanding extremely long secondary, such as rail transit and ropeless elevator, the conventional permanent magnet linear synchronous motor (PMLSM) is inappropriate, because large amount of expensive permanent magnets or copper windings are indispensable. Flux-switching linear permanent magnet motor (FSPMLM) is more appropriate for the long secondary occasions, because its permanent magnets and windings are all installed in the primary side. Its secondary side only consists Manuscript

show abstract

Method of Applying Force Distribution Function for Linear Switched Reluctance Motor Driven by Current Source Inverter

Hirayama

Kawabata

2018

2018 International Power Electronics Conference (IPEC-Niigata 2018 -ECCE Asia)

View full text Add to dashboard Cite

Cogging force reduction for the linear flux-switching permanent magnet machines based on a twisted stator

Cited by 3 publications

References 14 publications

A new design approach for reduction of force ripple in permanent magnet flux‐switching linear motor

A new design approach for reduction of force ripple in permanent magnet flux‐switching linear motor

Reduction of the Detent Force in a Flux-Switching Permanent Magnet Linear Motor

Method of Applying Force Distribution Function for Linear Switched Reluctance Motor Driven by Current Source Inverter

Contact Info

Product

Resources

About