Analysis and Experimental Verification of Losses in a Concentrated Wound Interior Permanent Magnet Machine

Dutta, Rukmi; Chong, L.; Rahman, M.F.

doi:10.2528/pierb12110715

Cited by 22 publications

(15 citation statements)

References 40 publications

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“…The experimental way seemed to be the most reliable [25] but forced to carry out a series of complex activities to measure the different loss contributions, e.g., for all tests have been necessary to maintain the same stator and the same bearings, changing the outrunner rotor with the different magnets under test.…”

Section: Introductionmentioning

confidence: 99%

Impact of a Bonded-Magnet Adoption on a Specific Fractional Motor Power and Efficiency

Ferraris

Franchini

Pošković

et al. 2014

IEEE Trans. on Ind. Applicat.

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The problem of evaluating the impact on the efficiency consequent to the adoption of bonded magnets in substitution of ferrites in small permanent-magnet machines is faced. That is necessary for the development of the main object of this paper: The evaluation of the obtainable performances of a specific brushless dc motor fractional motor through simple substitution of bonded magnets proposed by the authors to the ferrite magnets used up to now. The final aim is to make clear the practical adoptability of the proposal. Several prototypes produced in the authors' laboratories have been tested, and a long experimental activity has been carried on. In particular, the focus of the work has been the identification and separation of the iron losses, both hysteresis and eddy currents, from the contribution of the bearings. The corresponding torques have been calculated, and the energetic behaviors of the original machine with ferrites and the prototypes with phenolic bonded magnets have been analyzed. The satisfactory impact on the efficiency and the improvement of the output power of the motor with bonded magnets let possible to consider the analyzed solution as realistically adoptable.

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Section: Introductionmentioning

confidence: 99%

Impact of a Bonded-Magnet Adoption on a Specific Fractional Motor Power and Efficiency

Ferraris

Franchini

Pošković

et al. 2014

IEEE Trans. on Ind. Applicat.

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“…The second one focuses on the magnets. The sintered magnets are segmented and that will reduce the effects of eddy currents [46]. The solutions that have been developed here is based, in part, on the winding layout: the use of the double-star structure.…”

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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“…This was assumed for the motor model (and important for the installation of the magnets), but without any specification for the exact arrangement, since losses inside the magnets have been shown to be very small for internal permanent magnet machines (Dutta et al 2013).…”

Section: Permanent Magnetsmentioning

confidence: 99%

“…Coils were grouped into four parallel branches, and the number of turns per coil was expected to vary with the stack length, in order to maintain the same maximum current density and base speed for all motors. Most important, the Bfill factor,^i.e., the part of the cross-section occupied by copper compared to the total area of each slot (also called Bslot fill ratio^), was set to 45% in all machines, this being a typical value (Dutta et al 2013).…”

Section: Winding Configuration and Copper Massmentioning

confidence: 99%

A scalable life cycle inventory of an electrical automotive traction machine—Part I: design and composition

Lundmark

Grunditz

Tillman

et al. 2017

Int J Life Cycle Assess

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Purpose A scalable life cycle inventory (LCI) model of a permanent magnet electrical machine, containing both design and production data, has been established. The purpose is to contribute with new and easy-to-use data for LCA of electric vehicles by providing a scalable mass estimation and manufacturing inventory for a typical electrical automotive traction machine. The aim of this article (part I of two publications) is to present the machine design, the model structure, and an evaluation of the models' mass estimations. Methods Data for design and production of electrical machines has been compiled from books, scientific papers, benchmarking literature, expert interviews, various specifications, factory records, and a factory site visit. For the design part, one small and one large reference machine were constructed in a software tool, which linked the machines' maximum ability to deliver torque to the mass of its electromagnetically active parts. Additional data for remaining parts was then gathered separately to make the design complete. The two datasets were combined into one model, which calculates the mass of all motor subparts from an input of maximum power and torque. The range of the model is 20-200 kW and 48-477 Nm. The validity of the model was evaluated through comparison with seven permanent magnet electrical traction machines from established brands. Results and discussion The LCI model was successfully implemented to calculate the mass content of 20 different materials in the motor. The models' mass estimations deviate up to 21% from the examples of real motors, which still falls within expectations for a good result, considering a noticeable variability in design, even for the same machine type and similar requirements. The model results form a rough and reasonable median in comparison to the pattern created by all data points. Also, the reference motors were assessed for performance, showing that the electromagnetic efficiency reaches 96-97%. Conclusions The LCI model relies on thorough design data collection and fundamental electromagnetic theory. The selected design has a high efficiency, and the motor is suitable for electric propulsion of vehicles. Furthermore, the LCI model generates representative mass estimations when compared with recently published data for electrical traction machines. Hence, for permanent magnet-type machines, the LCI model may be used as a generic component estimation for LCA of electric vehicles, when specific data is lacking.Keywords Electric . Electrical . Inventory . IPM . IPMSM . Life cycle assessment . Machine . Magnet . Mass . Material Preamble This series of two articles presents a new scalable life cycle inventory (LCI) data model of an electrical automotive traction machine, available to download from the CPM database of the Swedish Life Cycle Center. Part I describes how the LCI model was established and the type of results it provides, including the underlying permanent magnet synchronous machine (PMSM) design and the structure of the LCI data m...

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Analysis and Experimental Verification of Losses in a Concentrated Wound Interior Permanent Magnet Machine

Cited by 22 publications

References 40 publications

Impact of a Bonded-Magnet Adoption on a Specific Fractional Motor Power and Efficiency

Impact of a Bonded-Magnet Adoption on a Specific Fractional Motor Power and Efficiency

Concentrated Windings in Compact Permanent Magnet Synchronous Generators: Managing Efficiency

A scalable life cycle inventory of an electrical automotive traction machine—Part I: design and composition

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