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Analysis and Reduction of cogging Torque in PM Torque Motors

Journal of Harbin Institute of Technology(New Series) 1994年第1期1卷 46-50页

作者：陆永平崔刘彦彬

The investigation involves detailed qualitative analysis and quantitative calculation of cogging torque in PM torque motors. The object of this analysis includes symmetric and non-symmetric motors, and the cause of the presence of Zth and 2Pth cogging torque is *** the optimum number of teeth per pole for both quasisquare and sinusoidal magnetic fields are presented. Finally, the experimental results are given.

关键词： ss: PM torque motor cogging torque

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Progress in the Research and Manufacture of GH4169 Alloy

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Journal of Iron and Steel Research International 2015年第8期22卷 657-663页

作者： Jin-hui DU Xu-dong LU Qun DENG Zhong-nan BI Beijing Key laboratory of Advanced High Temperature Materials Central Iron and Steel Research Institute

GH4169 alloy has been widely used in fields such as aviation, aerospace, and petrochemical, because of its excellent combination of mechanical and processing properties. These properties include good high-temperature strength, excellent creep and fatigue resistance, and good processing and welding performance. The requirement for high performance, high reliability, and long service life of modem engines has led to the incentive to develop GH4169 alloys with improved performance, such as increased temperature-bearing capacity, improved creep endurance, and better fatigue resistance. Advances during the past thirty years in ba- sic research and industrial technology related to GH4169 alloy were systematically summarized, including advances in alloy modi- fication, melting process optimization, and hot deformation technology.

关键词： GH4169 triple-melt cogging radial forging isothermal forging

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Developing a 3D-FEM Model for Electromagnetic Analysis of an Axial Flux Permanent Magnet Machine

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Journal of Electromagnetic Analysis and Applications 2010年第4期2卷 258-263页

作者： Seyyed Mehdi Mirimani Abolfazl Vahedi 不详

Recently, many optimal designs for axial flux permanent magnet (AFPM) motors were performed based on finite- element (FE) analysis. Most of the models are based on reduction of 3D problem to 2D problem which is not accurate for design aspects. This paper describes an accurate electromagnetic analysis of a surface mounted, 28 pole AFPM with concentrated stator winding. The AFPM is modeled with three-dimensional finite-element method. This model in-cludes all geometrical and physical characteristics of the machine components. Using this accurate modeling makes it possible to obtain demanded signals for a very high precision analysis. Magnetic flux density, back-EMF, magnetic axial force and cogging torque of the motor are simulated using FLUX-3D V10.3.2. Meanwhile, the model is paramet-ric and can be used for design process and sensitivity analysis.

关键词： Axial Flux Permanent Magnet (AFPM) Motor Three-Dimensional Finite-Element Method (3D-FEM) cogging Torque

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Time Series-, Time-Frequency- and Spectral Analyses of Sensor Measurements in an Offshore Wave Energy Converter Based on Linear Generator Technology

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Energy and Power Engineering 2013年第1期5卷 70-91页

作者： Erland Stromstedt Andrej Savin Olle Svensson Mats Leijon The Swedish Centre for Renewable Electric Energy Conversion Division for ElectricityDepartment of Engineering SciencesUppsala UniversityUppsalaSweden

Inside the second experimental wave energy converter (WEC) launched at the Lysekil research site on the Swedish west coast in March 2009 a number of sensor systems were installed for measuring the mechanical performance of the WEC and its mechanical subsystems. One of the measurement systems was a set-up of 7 laser triangulation sensors for measuring relative displacement of the piston rod mechanical lead-through transmission in the direct drive. Two measurement periods, separated by 2.5 month, are presented in this paper. One measurement is made two weeks after launch and another 3 months after launch. Comparisons and correlations are made between different sensors measuring simultaneously. Noise levels are investigated. Filtering is discussed for further refinement of the laser triangulation sensor signals in order to separate noise from actual physical displacement and vibration. Measurements are presented from the relative displacement of the piston rod mechanical lead-through, from magnetic flux in the air gap, mechanical strain in the WEC structure, translator position and piston rod axial displacement and active AC power. Investigation into the measurements in the time domain with close-ups, in the frequency domain with Fast Fourier transform (FFT) and with time-frequency analysis with short time Fourier transform (STFT) is carried out to map the spectral content in the measurements. End stop impact is clearly visible in the time-frequency analysis. The FFT magnitude spectra are investigated for identifying the cogging bandwidth among other vibrations. Generator cogging, fluctuations in the damping force and in the Lorenz forces in the stator are distinguished and varies depending on translator speed. Vibrations from cogging seem to be present in the early measurement period while not so prominent in the late measurement period. Vibration frequencies due to wear are recognized by comparing with the noise at generator standstill and the vibration sources in th

关键词： Wave Power Wave Energy Converter Linear Generator Sensor Measurements Spectral Analysis cogging Filtering Laser Triangulation Sensor Draw-Wire Sensor Force Transducer Strain Gauges Search Coil Power Generation

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