Forces in induction motors with laterally asymmetric sheet secondaries

Bolton, H.R.

doi:10.1049/piee.1970.0411

Cited by 16 publications

(6 citation statements)

References 4 publications

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“…In [9,10], the basic characteristic and 3D FEM model are analysed, however, the lateral displacement is not considered. Hybrid boundary is presented in [11], and laterally asymmetric secondary is studied using 1D model [12]. Dynamic characteristics, thrust and vertical force are presented in [13,14].…”

Section: Research Articlementioning

confidence: 99%

Electromagnetism calculation of single‐sided linear induction motor with transverse asymmetry using finite‐element method

Liu

Sun

2016

IET Electric Power Applications

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Electromagnetic variations of the single-sided linear induction motor (SLIM) are calculated by threedimensional (3D) finite-element method (FEM) when the primary is displaced sideways from a symmetrical position. For geometrical and electrical asymmetry, a full 3D model, which considering the longitudinal and transverse end effects, overhangs of the primary windings and secondary, as well as lateral displacement, is developed. Apart from the thrust and vertical force, lateral force is produced when the transverse asymmetry occurred. Hence, the calculation equation of thrust, vertical and lateral forces in each element of the 3D FEM model and boundary conditions are presented. Air-gap flux densities along the longitudinal and transverse directions with different lateral displacements are obtained, as well as the distortion coefficients of the air-gap flux density is proposed. Corresponding induced currents in the secondary are predicted. Finally, the variations of the thrust, vertical and lateral forces are experimentally validated by measurements on reciprocal power-fed test rig. It shows that the flux in between overhangs of the primary winding and secondary has great effect on the lateral force, the thrust and vertical force decrease with the increase of the lateral displacement.

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Section: Research Articlementioning

confidence: 99%

Electromagnetism calculation of single‐sided linear induction motor with transverse asymmetry using finite‐element method

Liu

Sun

2016

IET Electric Power Applications

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“…Compared with the space harmonic method, the results calculated by these models were more accurate and were validated by the experimental measurements. Bolton [10] proposed a model considering that the LIM worked with an asymmetric secondary sheet. However, an equivalent circuit for the LPSTs is difficult to derive by the sophisticated space harmonic method.…”

Section: Introductionmentioning

confidence: 99%

Equivalent Circuit Analysis of Linear Phase-Shifting Transformer with End Effect

Zhao

Guo

et al. 2022

Mathematical Problems in Engineering

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The linear phase-shifting transformers (LPSTs) are a new type of transformers with a structure similar to a linear motor that can be used in multiplex technology. A reasonable equivalent circuit is the premise of control research. Based on one-dimensional electromagnetic field analysis of the LPST, we reference the theory of linear motor and propose an equivalent circuit model of the LPST. The LPSTs, which are a phase-shifting transformers based on linear motor structure, are affected by end effects. The end effects affect the mutual inductance and secondary resistance of the LPST, which is modified by four correction coefficients. This paper calculates the four correction coefficients, inductance, and resistance of the LPST and then proposes a single-phase T-type equivalent circuit model considering end effects. Using the analytical model, the output voltages under the three working conditions are calculated and analyzed, and the accuracy is verified by comparison with results obtained by the finite element method. Finally, the accuracy of the analytical method is further verified by experiments under two working conditions, which indicates that the equivalent model is credible and useful for control research of multi-inverter system based on the LPST.

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“…It provides a quick understanding of the most important phenomena and a probable estimating the characteristics of LIMs. Besides, the 2D analysis [5–7], which either the longitudinal or transverse end effect can be neglected or can be considered to act independently, was widely used in practical analysis. Furthermore, the 3D analysis [8], which takes both of the end effects into account, could be considered a comprehensively accurate method.…”

Section: Introductionmentioning

confidence: 99%

“…While the secondary sheet is wider than the primary core, the accurate analysis is almost impossible, due to the difficulty of treating the end‐region. For example, Bolton [6] puts forward a useful 2D approach, which neglects skin effects and end‐regions field. Although the approach has some shortcomings, it proposes a coefficient that corrects the losses of the forces reduced by the transverse end effect, and it is a practical method in the analysis and control.…”

Section: Introductionmentioning

confidence: 99%

Influences on performance in 3D analysis of linear induction motors with different transverse m.m.f. models in winding end‐regions

Zeng

Zhou

2017

IET Electric Power Applications

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Since the three‐dimensional (3D) analysis of linear induction motor (LIM) needs to consider the transverse end effect, the transverse magnetomotive force (m.m.f.) distribution model becomes significantly important. This study investigates the influences of different transverse m.m.f. models on operating characteristics of double‐sided LIMs, and it also develops a novel m.m.f. model. First, four types of hypothetical distribution models are put into a 3D analytical method that considers the longitudinal and transverse end effects. Second, variations of the thrust, lateral and vertical forces with the models are comprehensively investigated in the possible operating regions. Besides, the calculated results are validated by finite elements method results and measurements in a prototype double‐sided linear induction motor (DLIM). Finally, the model presented in this study can be considered as a kind of optimal model for analysing DLIMs, and comparisons with other models in each operating region are mentioned.

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Forces in induction motors with laterally asymmetric sheet secondaries

Cited by 16 publications

References 4 publications

Electromagnetism calculation of single‐sided linear induction motor with transverse asymmetry using finite‐element method

Electromagnetism calculation of single‐sided linear induction motor with transverse asymmetry using finite‐element method

Equivalent Circuit Analysis of Linear Phase-Shifting Transformer with End Effect

Influences on performance in 3D analysis of linear induction motors with different transverse m.m.f. models in winding end‐regions

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