scholarly journals A Comparative Study of Single-tooth and Multi-tooth Stator of 4S-8P Permanent Magnet FSM for Electric Bicycle Application

2018 ◽  
Vol 7 (4.30) ◽  
pp. 295 ◽  
Author(s):  
Laili Iwani Jusoh ◽  
Erwan Sulaiman ◽  
M. Fairoz Omar ◽  
Hassan Ali Soomro

This paper present a comparative study of single-tooth and multi-tooth stator of 4S-8P permanent magnet Flux Switching Machine (FSM) for electric bicycle application. Detailed comparison of the performance characteristics of the machines are presented that include important issues such as average torque, volume of PM, back-EMF and speed performance. For a fair comparison, the valid stator slot and rotor combinations is same dimension and analyzed using finite element analysis, and the one among of the design has the best electromagnetic performance is selected. On the basis of the investigation, it can be concluded that the single-tooth design of proposed permanent magnet FSM for a single phase 4S-8P topology has presented higher torque performance compared to multi-tooth design. However, since design of single-tooth exhibits a higher back-EMF, Design optimization and improvement structural is ongoing to achieve the best performance.

2017 ◽  
Vol 2017 ◽  
pp. 1-8
Author(s):  
Lei Xia ◽  
Haobin Jiang

A novel winding type permanent magnet coupling (WTPMC) is proposed to work as an adjustable speed drive with slip power recovery function. As a kind of dual-mechanical-port electric machine with radial-flux configuration, the WTPMC consists of an outer rotor embedded with three-phase windings, an inner rotor populated with permanent magnets, and a slip power recovery circuit comprising a rectifier, a boost converter, and an ultracapacitor. The working principle of the WTPMC is presented, and its mathematical model is derived. To develop a WTPMC prototype for automotive applications, two-dimensional (2D) finite element analysis (FEA) is conducted using Ansoft Maxwell software to study the steady-state (constant slip speed) performance. For the experimental validation, the WTPMC prototype is manufactured and tested on a test bench. To show the accuracy of the 2D FEA, the computed results are compared with those obtained from experimental measurements. It is shown that the agreement between the 2D FEA and experimental results is good. Moreover, the WTPMC prototype can operate in the output speed range under different load torque conditions. The slip power recovery efficiency for the 2D FEA is 66.7%, while, for experimental measurements, it is 57.2%.


2013 ◽  
Vol 416-417 ◽  
pp. 144-148
Author(s):  
Ping Zheng ◽  
Yi Sui ◽  
Bin Yu ◽  
Fan Wu ◽  
Peng Fei Wang

This paper discusses the design of a fault-tolerant Permanent-Magnet Synchronous Machine (PMSM) for electric vehicles. The investigated machine is a five-phase in-wheel machine with 40 slots and 42 poles. The electromagnetic performance of double layer and single layer windings are compared based finite element analysis. The magnetic isolation abilities of the two winding types are also compared. Finally, a 12kW five-phase fault-tolerant machine which is able to meet the demand of electric drive system is designed and evaluated.


2015 ◽  
Vol 785 ◽  
pp. 274-279 ◽  
Author(s):  
Mahyuzie Jenal ◽  
Erwan Sulaiman ◽  
Faisal Khan ◽  
Md Zarafi Ahmad

This paper presents a new structure of permanent magnet flux switching machine (PMFSM) with multiple different sizes of rotor pole width. A robust single piece salient rotor is used to modulate and switch the flux linkage polarity in the armature winding and become the fundamental mechanism of these types of machines. The methodology of two-dimensional (2-D) finite element analysis (FEA) is used to evaluate the electromagnetic performance of coil test including flux line distributions, three phase flux linkage, cogging torque as well as induced emf. The resulting performances are analysed based on the variety of rotor pole width to meet the requirement of direct drive propulsion of Electric Vehicles (EVs).


2019 ◽  
Vol 64 (1) ◽  
pp. 85-102
Author(s):  
В. М. МОКИЕНКО ◽  
Т. Г. НИКИТИНА

Proverbs and sayings, which have always been considered the favourite genre of folklore and the representatives of the national mentality proper, have recently attracted particular attention of linguists. These are attempts to objectively establish the so-called “paremiological minimum” of different languages, the desire to measure the cognitive potential of the parеmias, and a broad comparative study of the proverbs and sayings of related and unrelated languages as well as a characteristic of the pragmatic capabilities of the latter. The present paper offers a comparative typological analysis of proverbs and sayings in the Russian and Hungarian languages. Despite their different genetic origins, it is in paremiology that there is a fairly large number of parallels of different types. The purpose of the paper is to identify such parallels and their classification by origin. The sources of such parallels are different: above all, longterm interaction with the paremiological systems of German and other European languages, including Slavic. Slavic paremiology, on the one hand, was a “donor” of borrowing in the form of tracing, on the other hand, it itself absorbed many Finno-Ugric paremias. That is why Hungarian paremiology and paremiography are of particular importance for comparative studies. And not only because the Hungarian language has historically absorbed a pan-European (including Slavic) paremiological heritage but also because Hungarian paremiography has long been one of the richest treasures of Hungarian and European small folklore. These collections of Hungarian proverbs and sayings against a broad interlanguage background are one of the most significant paremiological traditions. The rich paremiological collections accumulated by Hungarian researchers provide an opportunity for a detailed comparison of Slavic and Hungarian proverbs and sayings against a common European background and at the same time to trace the traces of direct Slavic-Hungarian contacts. Of particular importance in such a comparative study is the dialectal material, both in Hungarian and Slavic. When comparing the paremias of Russian and Hungarian languages, linguistic details are especially important, allowing to demonstrate the adaptation of the common European heritage to the Slavic and Finno-Ugric languages and to determine the proportion of similarities and differences between the respective paremias. It is not only genetic inertia but also the field of variation of borrowed proverbs and sayings that forms their national specificity. A comparative study shows that the Slavic variant proverb series look more compact and almost unchangeable. The variation of the Hungarian proverbs reveals a much wider amplitude, although it also retains the “classical” version as the main one. Some of them can be considered nationally specific despite the universality and globality of the range of some proverbs. The quota of national specificity for each of the options is different but it is the paremiological details that contain the national colour reflected in the language.


2013 ◽  
Vol 561 ◽  
pp. 250-254 ◽  
Author(s):  
Ge Zhang ◽  
Zhi Wei Jiao ◽  
Yong Liu ◽  
Yue Xing Liu ◽  
Hua Yan ◽  
...  

The article proposed a kind of new structure for aircraft tire, which includes double firm rings. The aircraft tire of double firm rings was simulated in the instant of landing by finite element analysis, then the simulation result was compared with the one of ordinary aircraft tire. The result indicated that the grounding area and deformation of aircraft tire with double firm rings was less than that of ordinary aircraft tire, which can decrease the rolling resistance and improve high speed performance. In addition, the larger contact pressure located the central region of the contact surface, which can reduce the damage of shoulder rubber and lengthen the life of the aircraft tire.


2020 ◽  
Vol 64 (1-4) ◽  
pp. 959-967
Author(s):  
Se-Yeong Kim ◽  
Tae-Woo Lee ◽  
Yon-Do Chun ◽  
Do-Kwan Hong

In this study, we propose a non-contact 80 kW, 60,000 rpm coaxial magnetic gear (CMG) model for high speed and high power applications. Two models with the same power but different radial and axial sizes were optimized using response surface methodology. Both models employed a Halbach array to increase torque. Also, an edge fillet was applied to the radial magnetized permanent magnet to reduce torque ripple, and an axial gap was applied to the permanent magnet with a radial gap to reduce eddy current loss. The models were analyzed using 2-D and 3-D finite element analysis. The torque, torque ripple and eddy current loss were compared in both models according to the materials used, including Sm2Co17, NdFeBs (N42SH, N48SH). Also, the structural stability of the pole piece structure was investigated by forced vibration analysis. Critical speed results from rotordynamics analysis are also presented.


2020 ◽  
Vol 64 (1-4) ◽  
pp. 1337-1345
Author(s):  
Chuan Zhao ◽  
Feng Sun ◽  
Junjie Jin ◽  
Mingwei Bo ◽  
Fangchao Xu ◽  
...  

This paper proposes a computation method using the equivalent magnetic circuit to analyze the driving force for the non-contact permanent magnet linear drive system. In this device, the magnetic driving force is related to the rotation angle of driving wheels. The relationship is verified by finite element analysis and measuring experiments. The result of finite element simulation is in good agreement with the model established by the equivalent magnetic circuit. Then experiments of displacement control are carried out to test the dynamic characteristic of this system. The controller of the system adopts the combination control of displacement and angle. The results indicate that the system has good performance in steady-state error and response speed, while the maximum overshoot needs to be reduced.


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