Design of high-speed data collecting system for pipeline magnetic flux leakage inspection

2013 ◽  
Author(s):  
Weidong Qu ◽  
Hongbing Xu
Keyword(s):  
Magnetic Flux ◽  
High Speed ◽  
Magnetic Flux Leakage ◽  
Data Collecting ◽  
High Speed Data ◽  
Flux Leakage ◽  
Collecting System

Study on the Application of FPGA in Magnetic Flux Leakage Acquisition System

2013 ◽  
Vol 694-697 ◽  
pp. 1354-1357
Author(s):  
Ming Gang Chai ◽  
Xia Hai ◽  
Xun Wu Gong
Keyword(s):  
Magnetic Flux ◽  
High Speed ◽  
Detection System ◽  
Magnetic Flux Leakage ◽  
Acquisition System ◽  
Time Data ◽  
Communication Module ◽  
Serial Processor ◽  
Data Design ◽  
Flux Leakage

Embedded CPU in traditional magnetic flux leakage detection system was used as the master controller. CPU is serial processor, which making it difficult to collect the large amounts of real-time data. While FPGA has the advantages of high integration, high speed processing, parallel processing. FPGA is applied to magnetic flux leakage acquisition system to solve data acquisition problem. It comes up with the designs of a multi-channel magnetic flux leakage signal selection control module, A/D conversion module and communication module in VHDL language on QuartusII. The experimental results show that each module of the magnetic flux leakage acquisition system based on FPGA can meet the requirements, and can correctly collect magnetic flux leakage signal, convert and transmit data. Design of FPGA-based is programmable in the field, magnetic flux leakage collection system can be flexibly designed for different occasions, and has independent intellectual property rights.

Design of Power Density Improvement by Applying Novel Shape of Slit and Notch to Outer Rib of Rotor of Spoke-type Permanent Magnet Synchronous Motor

2018 ◽  
Vol 12 (1) ◽  
pp. 75-85 ◽  
Author(s):  
Hyungkwan Jang ◽  
Sooyoung Cho ◽  
Kang Seok Lee ◽  
Ye Jun Oh ◽  
Ju Lee
Keyword(s):  
Magnetic Flux ◽  
Permanent Magnet ◽  
Power Density ◽  
High Speed ◽  
High Efficiency ◽  
Magnetic Flux Leakage ◽  
Manufacturing Cost ◽  
Washing Machine ◽  
Finite Elements Analysis ◽  
Flux Leakage

Objective:In this study, improvement of power density by applying novel shape of slit and notch to outer ribs of a rotor that reduces magnetic flux leakage in outer rib and increases air-gap magnetic flux density for spe PMSM for a washing machine, was investigated.Methods:It is important that motors for home appliance require lower manufacturing cost, high power and high efficiency. In order to increase power, rotor shape is re-designed. In the outer rib of the rotor, magnetic flux leakage occurs by permanent magnet and magnetic flux is saturated which is one of the factors that reduces the power and efficiency. However, if the outer rib is designed to be too thin, the permanent magnet may scatter during high-speed rotation. Therefore, a design considering permanent magnet scattering is necessary. Motor for a washing machine has two operating points that washing mode at constant torque point and dehydrating mode at high-speed point.Conclusion:For improvement of higher power density, 2-D finite elements analysis was performed to optimize the parameters of the shape of slit and notch to increase the torque. The torque increases by optimizing width and length of slit shape and notch shape. Finally, with the optimized parameters of shape of slit and notch, stack length was adjusted as per torque requirement for a washing machine motor and power density increases considering the safe factor from stiffness analysis.

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