Magnet losses in inverter-fed two-pole PM machines

Gonzalez, A.; Millinger, Jonas; Soulard, Juliette

doi:10.1109/icelmach.2016.7732776

Cited by 4 publications

(5 citation statements)

References 13 publications

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“…Fundamental losses P 0 are independent of the supply waveform, whereas the harmonic ones P h depend on the inverter supply waveform. Due to the absence of stator slots, and negligible amount of winding space harmonics in the motor under study [27], the harmonic losses are essentially caused by the time harmonics of the input voltage PWM. In its industrial application, the motor is fed by a threephase power electronic inverter with a 325 V DC-bus via an inductive filter.…”

Section: Investigated Motormentioning

confidence: 99%

High-Frequency Characterization of Losses in Fully Assembled Stators of Slotless PM Motors

Millinger

Wallmark

Soulard

2018

IEEE Trans. on Ind. Applicat.

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PostprintThis is the accepted version of a paper published in IEEE transactions on industry applications. This paper has been peer-reviewed but does not include the final publisher proof-corrections or journal pagination. IEEE transactions on industry applicationsAccess to the published version may require subscription. N.B. When citing this work, cite the original published paper. © © 2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. Abstract-The recent emerge of wide band-gap (WBG) power transistors enables higher switching frequencies in electrical motor drives. Their full utilization from a system point of view requires quantification of the corresponding time-harmonic motor losses. As an initial step, this paper presents a unique study of stator losses for three different commercially available non-oriented silicon-iron (SiFe) steel grades (with lamination thicknesses 0.1, 0.2 and 0.3 mm). The investigations cover a wide frequency range (10-100 kHz) at different levels of DC-bias (up to 1.6 T). Iron losses are identified from measurements on fully assembled stators, deploying a novel technique. By utilizing fully assembled stators, no additional samples are required. Manufacturing influence is inherently incorporated. Results show that measured iron losses are twice as high at 10 kHz compared to Epstein test results, which emphasizes the need to incorporate manufacturing influence on iron losses at high frequencies. The level of DC-bias is also observed to have a significant impact on iron losses (up to 30 %). Even though thinner laminations are known for reducing iron losses, the reduction is much lower than anticipated in the studied frequency range due to skin effect. Using 0.1 mm lamination gauge instead of 0.3 mm reduces losses by 50 % at 10 kHz, while the same substitution at 100 kHz only reduces losses by 30 %. Future work includes loss separation in complete converter-fed machines.

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Section: Investigated Motormentioning

confidence: 99%

High-Frequency Characterization of Losses in Fully Assembled Stators of Slotless PM Motors

Millinger

Wallmark

Soulard

2018

IEEE Trans. on Ind. Applicat.

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“…Content may change prior to final publication. machinery can be found in for example [1]- [4], [33], [34]. The absence of slots eliminates cogging torque and provides a practically linear current versus torque relationship [24], subsequently improving position control capability.…”

Section: Investigated Motormentioning

confidence: 99%

“…The additional power losses due to a rotor ring can be subdivided into: a) the losses generated by the injection signal itself; b) the time-harmonic losses due to inverter switching; and c) the losses due to the space harmonics caused by the stator winding [32]. However, unlike slotted machines, the investigated slotless machine exhibits negligible levels of MMF space-harmonics [34]. Therefore, only power losses generated by the signal injection and time harmonics (a-b) are treated below.…”

Section: A Power Losses and Thermal Evaluationmentioning

confidence: 99%

“…The method not only improves anisotropy but also the sensitivity to saturation and d and q-axis cross-coupling [28], [31] at the expense of additional rotor losses [32]. Compared to conventional slotted machinery, the slotless motor type has significant advantages in terms of negligible amount of space harmonics [33], [34] and very limited saturation effects [24]. Therefore, this paper presents the previously unprecedented analysis of a short-circuit rotor-ring design methodology for a 2-pole slotless PM motor, enabling accurate self-sensing control capability in the full speed-range.…”

Section: Introductionmentioning

confidence: 99%

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Design and Evaluation of a Short-Circuit Rotor-Ring for Enhanced Self-Sensing Capability in a Slotless PM Motor

Millinger

Bacco

Manzolini

et al. 2020

IEEE Trans. Ind. Electron.

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“…In [14] and [15] analytical approximations are proposed. However, neither 2D-FEM nor analytical approaches yield reliable results since such models are appropriate when the length of the PMs is much larger than the thickness [16]. In order to validate the calculated values with the measurements, PM and rotor back were estimated with 3D-FEM simulations.…”

Section: Segregation Of the Lossesmentioning

confidence: 99%

Investigation of a Surface Mounted PM Machine Concept with 3D-Flux Paths, Modular Stator and Amorphous Material

Gonzalez

Wang

Rasmussen

2019

2019 IEEE International Electric Machines &Amp; Drives Conference (IEMDC)

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This paper deals with the design and investigation of a surface mounted machine concept targeted at the efficient recycling of rare-earth materials used in permanent magnets. The proposed machine has an outer rotor, single phase and a modular stator. In addition, the use of laminated iron based amorphous material is investigated. The implementation of this type of material in electrical machines is of interest due to their performance in terms of reduced losses when compared with standard electrical steel. However, the widespread use of amorphous materials is limited mainly due to their hardness and brittleness that make their processing (i.e. cutting and punching) a challenging task. Hence, an alternative for the use of such material is proposed in this paper, with the combination of both laminated C-shaped amorphous cores and a modular stator. 3D-FEM calculations of various parameters such as back-EMF, torque, inductance and losses, were validated with measurements performed on a demonstrator.

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Magnet losses in inverter-fed two-pole PM machines

Abstract: Magnet losses in inverter-fed two-pole PM machines. In

Cited by 4 publications

References 13 publications

High-Frequency Characterization of Losses in Fully Assembled Stators of Slotless PM Motors

High-Frequency Characterization of Losses in Fully Assembled Stators of Slotless PM Motors

Design and Evaluation of a Short-Circuit Rotor-Ring for Enhanced Self-Sensing Capability in a Slotless PM Motor

Investigation of a Surface Mounted PM Machine Concept with 3D-Flux Paths, Modular Stator and Amorphous Material

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