scholarly journals Speed and position detecting systems for vehicle with linear synchronous motors

2015 ◽  
Vol 1 (2) ◽  
pp. 85-99
Author(s):  
Victor V Nikitin ◽  
Sergey Valer'evich Gulin ◽  
Eugene G Sereda
Keyword(s):  
Traffic Safety ◽  
High Speed ◽  
Detection System ◽  
Traction Force ◽  
Transportation Systems ◽  
System Delay ◽  
Friction Forces ◽  
Synchronous Motors ◽  
Position Detection ◽  
Linear Synchronous Motors

In high-speed ground transport linear synchronous motors are used to create a traction force. Advantages of linear synchronous motors are precise control of traction force (does not depend on friction forces) and lack of wearing parts. Linear synchronous motors control systems use block diagrams with orientation on rotor flux linkage. In such systems, information about exact position of movable part allows splitting active and reactive components of stator currents and as result independent control of motor traction force and magnetic flux. Errors in determination position can lead to errors in d-q transformation what affect calculations performed in motor model, and impact on traction force. Moreover, information on position of vehicle is also important to ensure traffic safety. In conventional types of wheeled vehicles for determining speed and position contact probes and tachometers are used. However, in high-speed magnetic levitation transport non-contact sensors is needed. In addition, when creating control system delay in transmission of radio signals from vehicle to ground control unit should be taken into account. This paper revive methods of speed and location detection for industry and high-speed ground transportation systems with linear synchronous motors. Also, variant of speed and position detection system for freight Maglev was suggested.

Design and Implementation of a High-Speed Real-Time Position Detection System in Electromagnetic Coil Launcher

2020 ◽  
Vol 48 (9) ◽  
pp. 3203-3210
Author(s):  
Guan Xiao Cun ◽  
Shuai Wang ◽  
Denghua Guo ◽  
Shaohua Guan ◽  
Baolong Liu ◽  
...  
Keyword(s):  
Real Time ◽  
High Speed ◽  
Detection System ◽  
Electromagnetic Coil ◽  
Design And Implementation ◽  
Position Detection ◽  
Time Position

Design of a High-Speed Long-Stroke Heavy-Load Magnetically Suspended Door System

2014 ◽  
Vol 678 ◽  
pp. 436-443
Author(s):  
Bin Bin Huang ◽  
Chi Zhang ◽  
You Yong Liao
Keyword(s):  
Permanent Magnet ◽  
High Speed ◽  
Normal Force ◽  
Heavy Load ◽  
Synchronous Motors ◽  
Advantages And Disadvantages ◽  
Linear Synchronous Motors ◽  
Long Stroke ◽  
Better Than

By studying the advantages and disadvantages of the conventional automatic linear door systems, it was found that flat permanent magnet linear synchronous motors (PMSLM) can satisfy high-speed long-stroke heavy-load door systems better than other techniques. In order to reach a long lifespan, the authors compared five possible topologies with flat PMLSM, and then designed a kind of magnetically suspended door system driven by a single-sided flat PMLSM and suspended by the normal force of the motor. The results demonstrate that the prototype door system satisfies the requirements.

scholarly journals Intelligent Driving Detection System Based on unmanned Driving Background

2021 ◽  
Vol 2108 (1) ◽  
pp. 012072
Author(s):  
Hongqi Wang ◽  
Shouman Chen ◽  
Yahong Wen ◽  
Chaofan Zhou
Keyword(s):  
Traffic Safety ◽  
Automobile Industry ◽  
High Speed ◽  
Detection System ◽  
Frame Rate ◽  
Practical Significance ◽  
Important Research ◽  
Target Image ◽  
Research Topics ◽  
Development Direction

Abstract Unmanned driving is the future development direction of the automobile industry, and intelligent driving detection is one of the important research topics. In order to improve driverless technology and traffic safety, this design is based on FPGA technology to design a driving detection system, combined with off-chip SDRAM’s high-speed, large-capacity cache and image processing related algorithms, and it will achieve the function of acquiring target image, cache, detection and display. Finally, the FPGA development board is used to test the driving detection system, which demonstrates that this driving detection system can better improve the safety monitoring problems in unmanned driving. At the same time, the system’s frame rate is close to 55pfs, which has practical significance and application value.

Magnetic Levitation: Linear Synchronous Motor Efficiency

1972 ◽  
Vol 50 (24) ◽  
pp. 3143-3146 ◽  
Author(s):  
David L. Atherton ◽  
L. E. G. Love ◽  
P. O. Prentiss
Keyword(s):  
High Speed ◽  
Peak Power ◽  
High Efficiency ◽  
Magnetic Levitation ◽  
Wave Form ◽  
Induced Voltage ◽  
Optimum Length ◽  
Synchronous Motors ◽  
Motor Efficiency ◽  
Linear Synchronous Motors

Large gap linear synchronous motors suitable for magnetically levitated high speed guided ground transport are considered. It is shown that if a is the gap (suspension height) propulsion magnets have an optimum length of 1.5a and induce an almost sinusoidal wave form in the guideway coils. The efficiency is then η = 1/[1 + PR/E2, cos2 θ] where E is the induced voltage, P the power, R guideway resistance, and cos θ the ratio of average to peak power. A design example shows that high efficiency is possible even at a suspension height of 30 cm.

End Edge Characteristics of the Stationary Discontinuous Armature PM-LSM by Installing the Double-Auxiliary Teeth

2013 ◽  
Vol 416-417 ◽  
pp. 339-344
Author(s):  
Sung Jin Kim ◽  
Yong Jae Kim ◽  
Sang Yong Jung
Keyword(s):  
Numerical Analysis ◽  
Permanent Magnet ◽  
Transportation Systems ◽  
Synchronous Motors ◽  
Linear Synchronous Motors ◽  
Driving Source ◽  
Discontinuous Arrangement

The stationary discontinuous armatures that are used in permanent magnet linear synchronous motors (PMLSMs) have been proposed as a driving source for transportation systems. However, the stationary discontinuous armature PMLSM contains the end edges which always exist as a result of the discontinuous arrangement of the armature. For this reason, the high alteration of the end edge cogging force produced between the armatures core and the movers permanent magnet when a mover passes the boundary between the armatures installation part and non-installation part has been indicated as a problem. Therefore, we have examined the end edge cogging force by installing the double-auxiliary teeth at the end edge of the armature in order to minimize the end edge cogging force generated when the armature is arranged discontinuously. This paper presents the results of 2-D numerical analysis by FEM of the cogging force exerted by the end edge.

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