eLearning

Process research on cogging rolling of H beam

Qin Qin; Jingjing Li; Diping Wu; Yong Zang 2010 International Conference on Mechanic Automation and Control Engineering, 2010

H beam has been widely used in industry and civil steel structure. But there are many key technologies that must be solved in order to produce high quality H-beam. This paper describes an investigation into the rolling technology using MARC software to model reversing rolling process of H-beam and compare the results with PDA data. A FEM model involving in ...

A permanent magnet generator with PCB stator for low speed marine current applications

Sanjida Moury; M. Tariq Iqbal 2009 1st International Conference on the Developements in Renewable Energy Technology (ICDRET), 2009

This paper introduces the design and development of a novel axial-flux permanent magnet generator (PMG) using a printed circuit board (PCB) stator winding. This design has the mechanical rigidity, high efficiency and zero cogging torque required for a low speed water current turbine. The PCB stator has simplified the design and construction and avoids any slip rings. The flexible PCB ...

New cogging-torque reduction method for brushless permanent-magnet motors

Chang Seop Koh; Jin-Soo Seol IEEE Transactions on Magnetics, 2003

We present a new design method for reducing cogging torque in brushless permanent-magnet (PM) motors. In our method, the auxiliary slots are put on the pole face of the magnetizing yoke, which results in a not fully magnetized zone (NFMZ) at the PM. Through Fourier expansion of the field and armature functions, the position and shape of the NFMZ that ...

Shape Optimization of a Large-Scale BLDC Motor Using an Adaptive RSM Utilizing Design Sensitivity Analysis

Pan Seok Shin; Han-Deul Kim; Gyo-Bum Chung; Hee Sung Yoon; Gwan-Soo Park; Chang Seop Koh IEEE Transactions on Magnetics, 2007

This paper proposes a new algorithm for the shape optimization of a large- scale brushless dc (BLDC) motor to reduce the cogging torque. In the algorithm, an adaptive response surface method (RSM) using the multiquadric radial basis function is employed to interpolate the objective function in design parameter space, and incorporated with (1+1) evolution strategy to find an optimal point. ...

Axial Vibration Study of a Mobile Fan Motor

Chien-Chang Wang; Yeong-Der Yao; Kun-Yi Liang; Chung-Chun Huang; Yu-Choung Chang; David A. Lowther IEEE Transactions on Magnetics, 2010

A method observing both radial and axial vibrations of time domain and frequency spectrum was studied to investigate the axial load effect of a flat- type brushless dc fan motor operating with and without the rated axial thrust force. When the developed small motor does not exhibit an intrinsically excited unbalanced magnetic force (UMF), the axial force leads to a ...

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IEEE-USA E-Books

• The Education Arcade

  This chapter contains sections titled: The Standard Drill, Roots, Re- Rebranding, Forging Ahead with Media Partnerships

• No title

  In the past 50 years there has been an explosion of interest in the development of technologies whose end goal is to connect the human brain and/or nervous system directly to computers. Once the subject of science fiction, the technologies necessary to accomplish this goal are rapidly becoming reality. In laboratories around the globe, research is being undertaken to restore function to the physically disabled, to replace areas of the brain damaged by disease or trauma and to augment human abilities. Building neural interfaces and neuro-prosthetics relies on a diverse array of disciplines such as neuroscience, engineering, medicine and microfabrication just to name a few. This book presents a short history of neural interfacing (N.I.) research and introduces the reader to some of the current efforts to develop neural prostheses. The book is intended as an introduction for the college freshman or others wishing to learn more about the field. A resource guide is included for students al ng with a list of laboratories conducting N.I. research and universities with N.I. related tracks of study. Table of Contents: Neural Interfaces Past and Present / Current Neuroprosthesis Research / Conclusion / Resources for Students

• Inventing the Invention of Wireless Telegraphy: Marconi versus Lodge

  This chapter contains sections titled: Fleming's Marconi Memorial Lecture of 1937, Hertzian Waves and ???Lodgian??? Practice in 1894, Marconi, Preece, the Maxwellians, and ???Practice vs. Theory???, Marconi's Patent ???for Everything???, Forging Lodge's Priority

• Generator Design and Construction

  This chapter contains sections titled: Stator Core Stator Frame Flux and Armature Reaction Electromagnetics End-Region Effects and Flux Shielding Stator Core and Frame Forces Stator Windings Stator Winding Wedges End-Winding Support Systems Stator Winding Configurations Stator Terminal Connections Rotor Forging Rotor Winding Rotor Winding Slot Wedges Amortisseur Winding Retaining-Rings Bore Copper and Terminal Connectors Slip-Collector Rings and Brush-Gear Rotor Shrink Coupling Rotor Turning Gear Bearings Air and Hydrogen Cooling Rotor Fans Hydrogen Containment Hydrogen Coolers References

• Contested Dynamos and Wires: Tribunals of Technologies, Ownership, and Identities

  This chapter contains sections titled: 5.1 Claiming the "Dynamo": Wilde vs. Thompson, 5.2 Winding Dynamos, Ownership, and Authority: Forging Credit as Reputation, 5.3 Credit Battles in Court: The Disputes over Dynamo Winding, 5.4 "Lame Fox" vs. the Supply Companies, 5.5 Conclusion

• Generator Design and Construction

  This chapter contains sections titled: Stator Core Stator Frame Flux and Armature Reaction Electromagnetics End-Region Effects and Flux Shielding Stator Core and Frame Forces Stator Windings Stator Winding Wedges End-Winding Support Systems Stator Winding Configurations Stator Terminal Connections Rotor Forging Rotor Winding Rotor Winding Slot Wedges Amortisseur Winding Retaining Rings Bore Copper and Terminal Connectors Slip-Collector Rings and Brush Gear Rotor Shrink Coupling Rotor Turning Gear Bearings Air and Hydrogen Cooling Rotor Fans Hydrogen Containment Hydrogen Coolers References