Investigation of AC loss of permanent magnet of SPM motor considering hysteresis and eddy-current losses

Fukuma, Atsushi; Kanazawa, Susumu; Miyagi, Daisuke; Takahashi, Norio

doi:10.1109/tmag.2005.846282

Cited by 50 publications

(31 citation statements)

References 5 publications

(5 reference statements)

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“…Simple studies that are using 2D simulations and analytic calculations can provide usable results. Designers have to know that hysteresis losses also exist in the magnets and they are not considered here [55]. Table 4.…”

Section: Main Characteristicsmentioning

confidence: 99%

Concentrated Windings in Compact Permanent Magnet Synchronous Generators: Managing Efficiency

Barre¹,

Napame

2016

Machines

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Abstract:In electric power generation, customers want generators with high efficiency. Nowadays, modern turbo-generators have efficiencies greater than 98%. Although this amount should not be obtained for all kind of machines, efficiency will remain one of the main parameters for customer choice. Efficiency is also linked to the life of the machine: the higher the efficiency is, the longer the machine's lifetime. During the past decade, new forms of energy production have appeared and generators have been developed to fit well into this market. For example, wind generators evolved towards permanent magnet generators having high polarity and running at low speed. Nevertheless, their structure is not fixed. An industrial company has built a prototype of such a generator which uses fractional-slot concentrated-windings (FSCW). This kind of winding is not the structure used by default in such electrical machines. Another field of interest is in autonomous generators which can be used on boats. Even if everyone has in mind large merchant ships, we must not forget smaller ships, such as fishing boats and short-range cruise ships, which spend the most of their time near the coast. This kind of ship does nothave large areas for installing the electric generation or the electric propulsion. It is the reason why, in this article, we focus on the efficiency of machines using fractional-slot concentrated-windings. In many publications which compare performances between distributed and concentrated windings, the result is almost the same. The efficiency of FSCW is not as high as the efficiency associated to the machines which are using distributed windings. Design methods have to be redrawn to integrate, as soon as possible, the loss mitigation in order to provide the best efficiency in power conversion. The following discussion, step by step, introduces the loss mitigation in every part of a machine using FSCW. To close the discussion, a design is produced and it appears that efficiency can be enhanced with suitable design methods.

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Section: Main Characteristicsmentioning

confidence: 99%

Concentrated Windings in Compact Permanent Magnet Synchronous Generators: Managing Efficiency

Barre¹,

Napame

2016

Machines

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“…In [13] PM losses are investigated and it is proved that at low frequencies the hysteresis losses of NdFeBMagnets are dominant and only for high frequencies eddy currents play an important role.…”

Section: Core Lossesmentioning

confidence: 99%

Influence of saturation effects in a transverse flux machine

Siatkowski

Orlik

2008

2008 13th International Power Electronics and Motion Control Conference

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In this paper the torque density of Transverse Flux Machines is investigated against the flux density inside the active parts with analytical calculations and FEM simulations. Especially saturation effects, which reduce the flux linkage with the coil, and core losses, are considered for both, the flux concentrating setup and the surface mounted magnets topology. The calculations are verified by measurements on an existing prototype. Finally new design guidelines are developed for the construction of TFMs with regard to the magnetic circuit.

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“…When such magnets are applied to the motors of electric vehicles and wind-turbine generators, their temperature rises due to the evolution of eddy currents. 1,2 The addition of DyN to Nd-Fe-B magnets and the grain refinement of Nd-Fe-B magnets are under consideration as measures to reduce these eddy currents. 3,4 In practice, however, Nd-Fe-B magnets cannot be used for these motors, and Nd-Dy-Fe-B magnets, with Dy added to increase the coercivity, are applied instead.…”

Section: Introductionmentioning

confidence: 99%

Coercivity of Nd-Fe-B hot-deformed magnets produced by the spark plasma sintering method

et al. 2016

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The effects of Nd-Cu alloy powder addition on the microstructures and magnetic properties of Nd-Fe-B hot-deformed magnets produced by the spark plasma sintering (SPS) method were investigated. The addition of a small amount of Nd-Cu alloy powder, up to 2%, significantly increased the coercivity of the Nd-Fe-B hot-deformed magnets without deteriorating the crystallographic alignment of the Nd2Fe14B phase. The Nd-Fe-B hot-deformed magnet with 2% Nd-Cu alloy powder had the same remanence value as the Nd-Fe-B hot-deformed magnet without Nd-Cu alloy powder addition, but the magnet with 2% Nd-Cu alloy powder exhibited higher coercivity and a higher maximum energy product than the magnet without Nd-Cu alloy powder addition.

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Investigation of AC loss of permanent magnet of SPM motor considering hysteresis and eddy-current losses

Cited by 50 publications

References 5 publications

Concentrated Windings in Compact Permanent Magnet Synchronous Generators: Managing Efficiency

Concentrated Windings in Compact Permanent Magnet Synchronous Generators: Managing Efficiency

Influence of saturation effects in a transverse flux machine

Coercivity of Nd-Fe-B hot-deformed magnets produced by the spark plasma sintering method

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