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

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.

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Design and Electromagnetic Analysis of a Double-Sided Permanent Magnet Linear Synchronous Motor

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.416-417.270 ◽

2013 ◽

Vol 416-417 ◽

pp. 270-275

Author(s):

Xin Min Zhang ◽

Chuan Ying Cheng ◽

Qin Fen Lu ◽

Yun Yue Ye ◽

Xiao Sheng Tao

Keyword(s):

Permanent Magnet ◽

High Speed ◽

Normal Force ◽

Thrust Force ◽

Cooling System ◽

Element Model ◽

Basic Structure ◽

Synchronous Motor ◽

Force Density ◽

Linear Synchronous Motor

The permanent magnet linear synchronous motor (PMLSM) has a good application prospect due to many significant advantages such as high speed, high precision, high thrust force density, simple structure, energy saving and reliable operation etc., so the research and development are of great importance. This paper mainly focuses on the key design points of a double-sided water-cooled PMLSM. According to the required thrust force, the design is given out including the basic structure parameters, winding connection methods and water cooling system. Based on the erected finite-element model, the performances such as back-EMF, thrust force, normal force, power factor and efficiency are predicted. By comparing with a single-sided PMLSM with the same specifications, it is proved that this double-sided PMLSM has lower thrust force ripple and higher thrust force density. Moreover, the net normal force of its mover is almost zero. Finally, the predicted back-EMF is verified by measurement.

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Development of High-Force-Density Iron-Core Linear Synchronous Motor

IEEJ Transactions on Industry Applications ◽

10.1541/ieejias.132.480 ◽

2012 ◽

Vol 132 (4) ◽

pp. 480-486 ◽

Cited By ~ 2

Author(s):

Masanobu Kakihara ◽

Toshiyuki Hoshi ◽

Toru Shikayama ◽

Motomichi Ohto

Keyword(s):

Synchronous Motor ◽

Force Density ◽

Iron Core ◽

Linear Synchronous Motor

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Force Ripple and Magnetic Unbalance Reduction Design for Doubly Salient Permanent Magnet Linear Synchronous Motor

IEEE Transactions on Magnetics ◽

10.1109/tmag.2011.2145363 ◽

2011 ◽

Vol 47 (10) ◽

pp. 4207-4210 ◽

Cited By ~ 25

Author(s):

Shi-Uk Chung ◽

Ji-Won Kim ◽

Byung-Chul Woo ◽

Do-Kwan Hong ◽

Ji-Young Lee ◽

...

Keyword(s):

Permanent Magnet ◽

Synchronous Motor ◽

Linear Synchronous Motor ◽

Doubly Salient ◽

Force Ripple

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Detent Force Modeling and Analysis for Vertical Permanent-Magnet Linear Synchronous Motor Using Equivalent Magnetic Network Method

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.143-144.148 ◽

2011 ◽

Vol 143-144 ◽

pp. 148-153 ◽

Cited By ~ 1

Author(s):

Xiao Zhuo Xu ◽

Xu Dong Wang ◽

Hai Chao Feng ◽

Ji Kai Si

Keyword(s):

Permanent Magnet ◽

Equivalent Circuit Model ◽

Synchronous Motor ◽

Iron Core ◽

Modeling And Analysis ◽

Force Modeling ◽

Detent Force ◽

Linear Synchronous Motor ◽

Calculation Results ◽

Magnetic Network

This paper investigates the detent force modeling of a slotted iron core type vertical permanent magnet linear synchronous motor (PMLSM) for ropeless elevator applications. Variable network non-linear magnetic equivalent circuit model is established to predict the detent force of PMLSM. The topology structure of equivalent magnetic circuit is developed and the permeances are derived and calculated. The end effect of two end teeth is essential for analysis of detent force and it is focused in the modeling. Magnetic saturation of primary iron-core also be taken into account. In final some 3-D finite-element numerical calculation results are used to validate the feasibility of the proposed method.

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Thermal Structure Analysis and Optimization of the Feeding System of the Permanent Magnet Linear Synchronous Motor

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.492.128 ◽

2014 ◽

Vol 492 ◽

pp. 128-134

Author(s):

Jun Hai Jiang ◽

Guo Yun Ye ◽

Yue Tong Xu

Keyword(s):

Permanent Magnet ◽

High Speed ◽

Thermal Structure ◽

Response Speed ◽

Element Model ◽

Synchronous Motor ◽

Cnc Machine Tools ◽

Cnc Machine ◽

Linear Synchronous Motor ◽

Temperature Field Model

Because of its high dynamic response speed and acceleration, high rigidity and positioning accuracy, the permanent magnet linear synchronous motor (PMLSM) is able to meet the requirements of high-speed precision CNC machine tools. However, its thermal problems have seriously hampered its development. This paper establishes a PMLSM temperature field model, designs a cooling structure, determines the boundary conditions of the finite element model and conducts computer simulation of the model. The result shows that the designed cooling structure can effectively alleviate the motors thermal problems.

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Detection and Analysis of Stator Winding Inter-Turn Short Circuit Fault in Permanent Magnet Linear Synchronous Motor

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.529.322 ◽

2012 ◽

Vol 529 ◽

pp. 322-326

Author(s):

Cai Xia Gao ◽

Chen Hao ◽

Yue Bing Zhao

Keyword(s):

Finite Element ◽

Permanent Magnet ◽

Short Circuit ◽

Element Model ◽

Synchronous Motor ◽

Stator Winding ◽

Element Analysis ◽

Harmonic Content ◽

Linear Synchronous Motor ◽

Short Circuit Fault

A two-dimensional finite element model of PMLSM is build based on the finite element analysis software Magnet to research the diagnosis of stator winding inter-turn short circuit fault in PMLSM. The velocity, thrust, the stator current performance curve are obtained by simulation using Magnet when PMLSM is normal and under different extent inter-turn short circuit fault, the harmonic content of speed and thrust are analyzed using Matlab / Simulink , the conclusion that the thrust of the harmonic content is used as the Permanent Magnet Linear Synchronous Motor (PMLSM) stator inter-turn short circuit fault feature is proposed , which provided a basis for detection of stator winding inter-turn short circuit fault in PMLSM.

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