scholarly journals Enhancing Capabilities of Double Sided Linear Flux Switching Permanent Magnet Machines

Energies ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 2781 ◽  
Author(s):  
Noman Ullah ◽  
Abdul Basit ◽  
Faisal Khan ◽  
Wasiq Ullah ◽  
Mohsin Shahzad ◽  
...  
Keyword(s):  
Permanent Magnet ◽  
High Efficiency ◽  
Thrust Force ◽  
Low Cost ◽  
Harmonic Distortion ◽  
Geometric Optimization ◽  
Force Density ◽  
Permanent Magnet Machines ◽  
Force Ripple ◽  
Long Stroke

Double sided linear flux switching permanent magnet machines (DSLFSPMMs) exhibit high thrust force density, high efficiency, low cost and robust double salient secondary (stator) structures. The aforementioned unique features make DSLFSPMM suitable for long stroke applications. However, distorted flux linkage waveforms and high detent forces can exaggerate thrust force ripples and reduce their applicability in many areas. In order to enhance thrust force performance, reduce thrust force ripple ratio and total harmonic distortion (THD) of no-load flux linkages, two structure-based advancements are introduced in this work, i.e., asynchronous mover slot and stator tooth displacement technique (AMSSTDT) and the addition of an active permanent magnet end slot (APMES). Furthermore, single variable geometric optimization (SVGO) is carried out by the finite element method (FEM).

Optimal Design of a Double-Sided Permanent Magnet Linear Synchronous Motor for Ropeless Elevator System

2013 ◽  
Vol 416-417 ◽  
pp. 99-103
Author(s):  
Li Ren Huang ◽  
Ji Wei Dong ◽  
Qin Fen Lu ◽  
Yun Yue Ye ◽  
Yi Chen
Keyword(s):  
Permanent Magnet ◽  
Low Cost ◽  
Element Model ◽  
Synchronous Motor ◽  
Underground Mines ◽  
Force Density ◽  
Iron Core ◽  
Linear Synchronous Motor ◽  
Deep Underground ◽  
Force Ripple

The ropeless elevator driven by linear motor is expected to be a new solution to vertical transportation of skyscrapers and the deep underground mines. Due to high thrust force density, low force ripple and low cost etc., a double-sided permanent magnet linear synchronous motor (DPMLSM) with slotted iron core and multi-segment primary is proposed and designed. Based on the erected 2D finite element model, the structure is optimized in order to reduce the detent force. Moreover, the influence of manufacture error on force performance is also investigated. It is shown the proposed DPMLSM is suitable for the ropeless elevator.

Novel linear switched-flux PM machine with 9/10 primary/secondary pole number combination

2015 ◽  
Vol 34 (6) ◽  
pp. 1656-1672 ◽  
Author(s):  
Qinfen Lu ◽  
Yanxin Li ◽  
Yunyue Ye ◽  
J.T. Chen ◽  
Z.Q. Zhu
Keyword(s):  
Permanent Magnet ◽  
Thrust Force ◽  
Load Condition ◽  
Design Parameters ◽  
Force Density ◽  
Direct Drive ◽  
Low Thrust ◽  
Element Analysis ◽  
Content Type ◽  
Force Ripple

Purpose – Due to linear structure, linear switched flux permanent magnet machines (LSFPMMs) also may have odd pole primary, such as 9, 15, 21, etc., without unbalanced magnetic force in equivalent rotary machines. The paper aims to discuss these issues. Design/methodology/approach – In order to increase the thrust force density, the influence of some major design parameters, including split ratio, PM thickness, primary slot width and secondary pole width, are investigated by finite element analysis. For reducing the thrust force ripple under on-load condition, the end auxiliary teeth are adopted and their positions are also optimized. Findings – This novel 9/10 primary/secondary poles LSFPMM has high average thrust force and low thrust force ripple by optimization. The results demonstrate that the odd pole primary may be a good candidate for long-stroke linear direct drive application. Originality/value – A novel 9/10 primary/secondary poles linear switched flux permanent magnet machine is developed in this paper. The similar conclusions could be obtained for other LSFPMMs with odd pole primary.

scholarly journals The Comparative Analysis of the Performances of Four and Six Pole Pairs Permanent Magnet Synchronous Generator

2019 ◽  
Vol 38 (1) ◽  
pp. 1-14
Author(s):  
R.A. Msuya ◽  
R.R.M. Kainkwa ◽  
M.I Mgwatu
Keyword(s):  
Permanent Magnet ◽  
High Efficiency ◽  
Harmonic Distortion ◽  
Synchronous Generator ◽  
Permanent Magnet Machines ◽  
Climate Conditions ◽  
Low Speed ◽  
Low Wind Speed ◽  
Turbine Generators ◽  
Wind Turbine Generators

Wind power applications using multi-poles permanent magnet generators have become very attractive especially in small ratings. Low-speed multi-pole PM generators are maintenance-free and may be used in different climate conditions. Most of the low speed wind turbine generators presented is permanent magnet machines, which have advantages of high efficiency and reliability since there is no need of external excitation and conductor losses are removed from the rotor. From the study two types of PM AC generator are designed with 6 pole pairs and the other one with 4 pole pairs. These generators were designed and analysed using Maxwell software. The results were compared for the best performance determination. The 6 poles generator was found to have good power output with less Total Harmonic Distortion (THD) and high efficiency of over 92% that could be achieved at low wind speed of 2 m/s.

Analysis and Performance Evaluation of a High Thrust Force Density Segmental Stator Linear Switch Reluctance Machine for Low Cost Conveyor Applications

2013 ◽  
Vol 416-417 ◽  
pp. 181-186
Author(s):  
Dao Han Wang ◽  
Xiu He Wang
Keyword(s):  
Performance Evaluation ◽  
Magnetic Circuit ◽  
Thrust Force ◽  
High Reliability ◽  
Low Cost ◽  
Force Density ◽  
Reluctance Machine ◽  
And Performance ◽  
High Thrust

This paper presents a novel linear switch reluctance machine (LSRM) with segmental stator. The principle of the presented machine is given and compared to the well-known teeth type linear switch reluctance machine. Because the presented machine incorporates a simple concentric winding and concrete ferrite-magnetic segmentations, it features unique magnetic circuit compared to teeth type linear reluctance machine. It is found that the presented linear reluctance machine gains favorable superiority over the teeth type linear reluctance machine in terms of high force density, high reliability and low cost. Different topologies of the presented machine are given and both their merits and demerits are discussed.

scholarly journals Comparison of the Stator Step Skewed Structures for Cogging Force Reduction of Linear Flux Switching Permanent Magnet Machines

Energies ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 2172 ◽  
Author(s):  
Wenjuan Hao ◽  
Yu Wang
Keyword(s):  
Finite Element Analysis ◽  
System Performance ◽  
Thrust Force ◽  
Low Cost ◽  
Good Choice ◽  
Permanent Magnet Machines ◽  
Maximum Difference ◽  
Element Analysis ◽  
Rotary Machines ◽  
Force Reduction

Linear flux switching permanent magnetic (LFSPM) machines, with the armature windings and magnets both on the mover in addition to a robust stator, are a good choice for long stoke applications, however, a large cogging force is also inevitable due to the double salient structure, and will worsen the system performance. Skewing methods are always employed for the rotary machines to reduce the cogging torque, and the rotor step-skewed method is a low-cost approximation of regular skewing. The step skewed method can also be applied to the linear machines, namely, the stator step skewed. In this paper, three stator step skewed structures, which are a three-step skewed stator, a two-step skewed stator and an improved two-step skewed stator, are employed for the cogging force reduction of two types of LFSPM machines. The three structures are analyzed and compared with emphasize on the influence of the skewed displacement on the cogging force and the average thrust force. Based on finite element analysis (FEA), proper skewed displacements are selected according to maximum difference between the reduction ratio of the cogging force and the decrease ratio of the average thrust force, then, the corresponding results are compared, and finally, valuable conclusions are drawn according to the comparison. The comparison presented in this paper will be useful to the cogging force reduction of LFSPM machines in general.

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