Calculation of PM Eddy Current Loss in IPM Machine Under PWM VSI Supply With Combined 2-D FE and Analytical Method

Cheng, Ming; Zhu, Sa

doi:10.1109/tmag.2016.2611582

Cited by 41 publications

(24 citation statements)

References 24 publications

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“…Several studies have been conducted to overcome the hassle of analyzing eddy currents of PMs using 3-D FEA [13][14][15][16]. Some studies have discussed the reduction of eddy current losses by dividing a PM that forms one pole into several segments [17,18].…”

Section: Of 15mentioning

confidence: 99%

Interior Permanent Magnet Synchronous Motor Design for Eddy Current Loss Reduction in Permanent Magnets to Prevent Irreversible Demagnetization

et al. 2020

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We designed and analyzed an interior permanent magnet synchronous motor (IPMSM) to prevent irreversible demagnetization of the permanent magnets (PMs). Irreversible demagnetization of NdFeB PMs mainly occurs due to high temperature, which should thus be minimized. Therefore, it is necessary to reduce the eddy current loss in the PM through optimal design. The shape of the rotor core was optimized using finite element analysis (FEA) and response surface methodology. Three-dimensional (3-D) FEA is required for accurate computation of the eddy current loss, but there is huge time, effort, and cost consumption. Therefore, a method is proposed for indirectly calculating the eddy current loss of PMs using 2-D FEA. A thermal equivalent circuit analysis was used to calculate the PM temperature of the optimized model. For the thermal analysis, the copper loss, core loss, and eddy current loss in PMs were estimated and applied as a heat source. Based on the results, we confirmed the stability of the optimum model in terms of the PM demagnetization.

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Section: Of 15mentioning

confidence: 99%

Interior Permanent Magnet Synchronous Motor Design for Eddy Current Loss Reduction in Permanent Magnets to Prevent Irreversible Demagnetization

et al. 2020

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“…5 has some physical meanings. When the skin depth or (1/ f h ) 0.5 is large at low frequency, locating at the resistance‐limited region [21], the PM ECL factors are almost constant because the eddy current circulating path keeps almost unchanged. When the skin depth is smaller than a certain value with the increase of frequency, locating at the inductance‐limited region, the square roots of PM ECL factors drops almost linearly with the decrease of (1/ f h ) 0.5 , which makes the factors at arbitrary frequencies can be easily inferred with the interpolation method.…”

Section: Relationships Between Hfhvs and Corresponding Eclsmentioning

confidence: 99%

“…Although the eddy current reaction and the axial segmentation effects were both considered in the analytical models of [18][19][20], current sources were used as the inputs in these methods. However, the highfrequency harmonic currents themselves caused by the PWMinduced HFHVs are hard to be accurately determined at the design stage due to the eddy current reaction effect [21]. More importantly, for PMs with arbitrary shapes, it will become more difficult to deduce the analytical PM ECL models [22].…”

Section: Introductionmentioning

confidence: 99%

“…Permanent magnet synchronous machines (PMSMs) with surface‐mounted permanent magnets (PMs) or interior PMs are widely applied in industry applications due to their merits of high torque density and high efficiency [1–22]. Besides, they are usually supplied by pulse‐width modulation (PWM) voltage source inverters (VSIs) for dynamically adjusting their torque and speed.…”

Section: Introductionmentioning

confidence: 99%

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Fast calculation of eddy current losses caused by pulse‐width modulation in magnets of surface‐mounted PM machines based on small‐signal time‐harmonic finite element analysis

Zhu

Wang

2020

IET Electric Power Applications

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This study presents a novel method for fast calculating the eddy current losses (ECLs) caused by pulse‐width modulation (PWM) harmonic voltages in the permanent magnets (PMs) of surface‐mounted PM synchronous machines (SPMSMs) with distributed windings or concentrated windings. Based on the small‐signal models of the SPMSMs, the functional relationships between the high‐frequency harmonic voltages (HFHVs) in the rotor reference frame and the corresponding ECLs are investigated with the time‐harmonic finite element analysis (THFEA). Instead of using complex analytical PM ECL models, the relationships are directly established with some numerical methods, such as the Gauss quadrature and the piecewise cubic Hermite interpolation method, based on the results from THFEA. With the functional relationships, the total PM ECL caused by all the HFHVs is simply calculated by summing the ECL generated by each harmonic component in the spectra of the PWM voltage in the rotor reference frame. Both two‐ and three‐dimensional (2D and 3D) models of the SPMSMs are calculated. Besides, to further reduce the needed steps of 3D THFEA, an equivalent 2D THFEA method using modified PM conductivities under different‐axis HFHV excitations is proposed. The merits of the proposed method are validated by comparing with the traditional time‐stepping finite element method.

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“…The stator currents cause asynchronous components in the air-gap field and induce rotor losses in electrical machines [39][40][41]. Control of PMSMS by pulse width modulation (PWM) can lead to PM losses due to the high frequency of stator magnetic field variations [42][43][44][45][46][47][48]. The eddy-current losses are mainly produced by the carrier harmonics of the PWM inverter [49].…”

Section: Supply and Controlmentioning

confidence: 99%

Permanent-Magnet Eddy-Current Losses: A Global Revision of Calculation and Analysis

Ouamara

Dubas

2019

MCA

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Eddy-current analysis is an important research field. This phenomenon occurs in multiple areas and has several applications: electromagnetic braking, repulsive effects, levitation, etc. Thereby, this paper is limited to eddy-current study in rotating electrical machines. In the design process, if the permanent-magnet (PM) loss calculation is very important, the overheating due to eddy-currents must be taken into account. The content of this paper includes sources, calculation methods, reduction techniques, and thermal analysis of PM eddy-current losses. This review aims to act as a guide for the reader to learn about the different aspects and points to consider in studying the eddy-current.

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Calculation of PM Eddy Current Loss in IPM Machine Under PWM VSI Supply With Combined 2-D FE and Analytical Method

Cited by 41 publications

References 24 publications

Interior Permanent Magnet Synchronous Motor Design for Eddy Current Loss Reduction in Permanent Magnets to Prevent Irreversible Demagnetization

Interior Permanent Magnet Synchronous Motor Design for Eddy Current Loss Reduction in Permanent Magnets to Prevent Irreversible Demagnetization

Fast calculation of eddy current losses caused by pulse‐width modulation in magnets of surface‐mounted PM machines based on small‐signal time‐harmonic finite element analysis

Permanent-Magnet Eddy-Current Losses: A Global Revision of Calculation and Analysis

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