Results 271 to 280 of about 11,229 (312)
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1991
Permanent magnet excited machines have always featured strongly in the application of magnets, and forecasts indicate that they will continue to do so. Compared to other machine formats, such as those based on induction or switched reluctance principles, permanent magnet excited types provide considerable flexibility in design, and many different ...
D. Howe, T. S. Birch
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Permanent magnet excited machines have always featured strongly in the application of magnets, and forecasts indicate that they will continue to do so. Compared to other machine formats, such as those based on induction or switched reluctance principles, permanent magnet excited types provide considerable flexibility in design, and many different ...
D. Howe, T. S. Birch
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Flat Magnets in Surface-Mounted Permanent Magnet Machines
2008 IEEE Industry Applications Society Annual Meeting, 2008The influence of flat magnets (FM) in surface- mounted permanent magnet machines (PMM) is analyzed taking the conventional single curved magnet (SCM) configuration as reference. The flat shape of magnets and the air gap between them increase the magnetic circuit reluctance and distort air gap flux density. As a consequence, the back electromotive force
Imanol Egaña +4 more
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Flux Guides for Permanent-Magnet Machines
IEEE Power Engineering Review, 2001A study for the enhancement of effective flux of permanent magnet (PM) machines using flux guides is presented. An intrinsic demagnetization curve that considers the leakage flux is introduced. On the basis of a higher effective flux the stator winding can be more compact; consequently, a lighter stator and a higher efficiency PM machine can be ...
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Pole-changing permanent-magnet machines
IEEE Transactions on Industry Applications, 2002Electric drives in which discrete speed control is required are today equipped exclusively with squirrel-cage induction motors, due to the property of the squirrel cage to always have the same number of poles as the stator winding. Conventional permanent-magnet (PM) machines have a constant number of poles and can be operated from a constant frequency ...
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1995
In permanent magnet excited rotating field machines the structure is broadly the same as the synchronous machine, i.e. there is a stator with the symmetrical three phase winding system and a rotor, which in this case has a permanent magnet instead of the excitation winding.
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In permanent magnet excited rotating field machines the structure is broadly the same as the synchronous machine, i.e. there is a stator with the symmetrical three phase winding system and a rotor, which in this case has a permanent magnet instead of the excitation winding.
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Interior permanent magnet machines with rare earth and ferrite permanent magnets
2017 IEEE International Electric Machines and Drives Conference (IEMDC), 2017This paper proposes a novel interior permanent magnet machine (IPMM) design in which the rotor employs U-shape magnet cavities filled with both rare earth and ferrite permanent magnets (PMs). The design aims to replace a portion of rare earth PM materials by ferrite magnets in order to minimize the material cost.
Zhentao S. Du, Thomas A. Lipo
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Study on the Permanent Magnet Demagnetization Fault in Permanent Magnet Synchronous Machines
IECON 2006 - 32nd Annual Conference on IEEE Industrial Electronics, 2006This article studies the permanent magnet demagnetization fault in permanent magnet synchronous machines (PMSM). The study is carried out by analyzing the harmonics obtained using the fast Fourier transform (FFT) of stator and zero sequence currents at nominal torque for the whole range of machine operation speeds.
J. A. Rosero +4 more
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Permanent Magnet Machine Optimization
2003The paper presents electrical machine design considerations introduced by exploiting new magnetic material characteristics. The materials considered are amorphous alloy ribbons as well as Neodymium alloy permanent magnets involving very low eddy current losses.
Georgios D. Kalokiris +2 more
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Unbalanced Magnetic Pull in Permanent Magnet Machines
7th IET International Conference on Power Electronics, Machines and Drives (PEMD 2014), 2014The paper studies the unbalanced magnetic force due to rotor eccentricity in permanent magnet machines. An analytical technique is presented for predicting the magnetic field distribution in a non-uniform airgap and the resulting unbalanced magnetic pull caused by eccentricities. The method is based on a simple modification of a 2D analytical technique
M. Michon +3 more
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Effect of Side Permanent Magnets for Reluctance Interior Permanent Magnet Machines
2007 IEEE Power Electronics Specialists Conference, 2007A traditional electric machine uses two dimensional magnetic flux paths in its rotor. This paper presents the development work on the utilization of the third dimension of a rotor. As an example, the air gap flux of a radial gap interior permanent magnet motor can be significantly enhanced by additional permanent magnets (PM) mounted at the sides of ...
J. S. Hsu +5 more
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