Magnet Skew Technology Investigation for the Reduction of PMLSM Thrust Ripple

2012 ◽  
Vol 476-478 ◽  
pp. 890-893 ◽  
Author(s):  
Jiong Jiong Cai ◽  
Jia Qi Ren ◽  
Liang Cheng ◽  
Yun Yue Ye
Keyword(s):  
Permanent Magnet ◽  
Synchronous Motor ◽  
End Effect ◽  
Linear Motors ◽  
Linear Synchronous Motor ◽  
Effect Model ◽  
Thrust Characteristics

Thrust characteristics of permanent magnet linear synchronous motor (PMLSM) are analyzed. It shows that frequency spectrums of thrust ripple, which are mainly caused by end-effect, are quite similar for linear motors with different pole/slot combinations. To apply magnet skew technology, a method using piecewise magnet for skewing factor computation is introduced. According to this piecewise method, a policy for analyzing 3D skew effect model using 2D FEM algorithm is investigated. The application on a 14-pole/12-slot PMLSM validated the algorithm.

Research on the End Effect Detent Force Reduction of Permanent Magnet Linear Synchronous Motor with Auxiliary Poles One-Piece Structure

2013 ◽  
Vol 416-417 ◽  
pp. 27-32
Author(s):  
He Zhang ◽  
Bao Quan Kou ◽  
Shou Lun Guo ◽  
Hai Lin Zhang ◽  
Yin Xi Jin ◽  
...  
Keyword(s):  
Permanent Magnet ◽  
Synchronous Motor ◽  
Linear Motor ◽  
End Effect ◽  
Detent Force ◽  
Linear Synchronous Motor ◽  
Force Reduction ◽  
The One

In order to minimize the detent force of permanent magnet linear synchronous motor (PMLSM) caused by end effect, a novel auxiliary poles one-piece structure is proposed. Two auxiliary poles are extended directly from two ends of the armature core. And magnetic isolation bridges are set between auxiliary pole and armature core. Compared with the conventional discrete auxiliary poles, the one-piece structure will reduce the manufacture difficulty of PMLSM with auxiliary poles and improve the reliability of linear motor.

The Thrust Characteristics Investigation of Double-Side Plate Permanent Magnet Linear Synchronous Motor for EML

2009 ◽  
Vol 45 (1) ◽  
pp. 501-505 ◽  
Author(s):  
Kou Bao-Quan ◽  
Wu Hong-Xing ◽  
Li Li-Yi ◽  
Zhang Liang-Liang ◽  
Zhao Zhe ◽  
...  
Keyword(s):  
Permanent Magnet ◽  
Synchronous Motor ◽  
Side Plate ◽  
Linear Synchronous Motor ◽  
Thrust Characteristics

scholarly journals End Effect Analysis of a Slot-Less Long-Stator Permanent Magnet Linear Synchronous Motor

Symmetry ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1939
Author(s):  
Yue Zhou ◽  
Wenjun Zong ◽  
Qiang Tan ◽  
Zhenjiang Hu ◽  
Tao Sun ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Permanent Magnet ◽  
Synchronous Motor ◽  
End Effect ◽  
Flux Linkage ◽  
Effect Analysis ◽  
Linear Synchronous Motor ◽  
Primary Origin ◽  
Left And Right ◽  
Air Gap Magnetic Field

The implications of the end effect for flux linkage and thrust ripple in a slot-less long-stator permanent magnet linear synchronous motor (LSPMLSM), are analyzed in this paper. Since it is affected by the end effect, the air-gap magnetic field density under the end permanent magnet is different from that under the non-end permanent magnet, leading to asymmetry in the thrust ripple. For this reason, we establish a dynamic permanent magnet flux linkage model, which proves that the end effect leads to sub-harmonics in the permanent magnet flux linkage. The motor’s magnetic field distribution in the left and right parts is symmetrical. A thrust model taking into account the flux linkage sub-harmonics is established, from which the amplitude and period of the thrust ripple caused by the end effect can be calculated. There is no detent force for the slot-less LSPMLSM, and the end effect is the primary origin of the motor thrust ripple. In order to suppress the end effect, a method of increasing the end iron length is proposed, as a result of which the sub-harmonics in the flux linkage and the motor thrust ripple are effectively suppressed. Experimental and simulation results verify the results of this paper.

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