The Effect of PWM on Rotor Eddy-Current Losses in High-Speed Permanent Magnet Machines

Jumayev, S.; Merdzan, M.; Boynov, K. O.; Paulides, Jjh Johannes; Pyrhönen, Juha; Lomonova, E. A.

doi:10.1109/tmag.2015.2438637

Cited by 47 publications

(24 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This can be explained by the rise of the eddy-current losses, which become predominant compared to the Joule losses in the stator winding at that frequency. Note that other phenomena can also influence the resistance, such as the skin and proximity effects inside the winding [1]; they are neglected as inductors are assumed to be stranded.…”

Section: Investigated Pmsmmentioning

confidence: 99%

“…Rare-earth permanent-magnet synchronous machines (PMSMs) are used for various applications, since they benefit from high compactness, efficiency and power factor [1]- [3]. However, rare-earth materials have a relative high conductivity [3] and eddy currents can develop in the permanent magnets (PMs).…”

Section: Introductionmentioning

confidence: 99%

“…However, rare-earth materials have a relative high conductivity [3] and eddy currents can develop in the permanent magnets (PMs). As the fundamental component of the magnetic flux is stationary with respect to the rotor, eddy-current losses are generally negligible compared to the other loss components [1]: only spatial flux harmonics (related to slotting and winding distribution) and temporal ones (due to switching) generate losses [1], [4], [5]. Despite this aspect, the temperature rise may be important due to the relative thermal insulation of the magnets [1] and deteriorate their properties (coercive field and remanent flux), possibly leading to their demagnetization [2], [5].…”

Section: Introductionmentioning

confidence: 99%

“…For those reasons an accurate estimation of the eddy-current losses is necessary for design purposes [6], but it is not easy [1]. Analytical approaches are widely used but may not be valid for all geometries (e.g.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Influence of 2D and 3D meshes in FE computation of eddy-current losses in surface PMSMs

Mollet¹,

Gyselinck²,

Sabariego³

2017

2017 International Conference on Optimization of Electrical and Electronic Equipment (OPTIM) &Amp; 2017 Intl Aegean Conference

View full text Add to dashboard Cite

Abstract-This paper investigates the influence of mesh when computing eddy currents in magnets of a permanent-magnet synchronous machine excited with pulsating currents (such as pulse-width modulation). 3D computations with globally and locally varying mesh densities are performed and results are compared with a reference (fine-mesh) case. It turns out that a global increase of mesh density has the most important impact on the result accuracy. The accuracy of 2D FE computations is also discussed for different stack lengths. It is shown that the use of a correction factor based on analytical approach can significantly increase accuracy for relatively short stack lengths.

show abstract

Section: Investigated Pmsmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Influence of 2D and 3D meshes in FE computation of eddy-current losses in surface PMSMs

Mollet¹,

Gyselinck²,

Sabariego³

2017

2017 International Conference on Optimization of Electrical and Electronic Equipment (OPTIM) &Amp; 2017 Intl Aegean Conference

View full text Add to dashboard Cite

show abstract

“…Loss modeling under such non-conventional supply conditions has been investigated in the past, assuming negligible skin effect [5]. In present devices, however, increasing supply frequencies are used and fundamental frequencies in the kilohertz range can be found [6], together with switching frequencies of several tens of kilohertz, favored by use of the new SiC or GaAs based power transistors modules [7] [8]. Under such conditions, the dynamics of the minor loops is strongly influenced by the skin effect, which brings about substantial interpretative difficulties in the theoretical modeling of the losses.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Loss Versus Frequency in Non-Oriented Steel Sheets and Its Prediction: Minor Loops, PWM, and the Limits of the Analytical Approach

et al. 2017

View full text Add to dashboard Cite

The Pulse Width Modulation (PWM) technique is commonly used to supply modern high-speed electrical machines. The fundamental frequency is typically in the kilohertz range, with switching frequencies of several tens of kilohertz, as determined by the new SiC or GaAs based power transistors modules. Switching introduces minor loops in the major hysteresis cycle, with durations of the order of 100 µs or lower, with the resulting magnetization dynamics influenced by strong skin effect. However, since these minor loops have relatively small amplitude, their constitutive equation may be described by an equivalent permeability (real or complex), depending on the mean slope of the minor loop and its static energy loss. By retrieving this permeability, the classical loss is straightforwardly calculated by analytical solution of the Maxwell's equations. In this work, we measure and calculate, according to the quasi-linear approximation for the minor loops, the magnetic energy losses of 0.194 mm thick non-oriented Fe-Si 3.2% sheets subjected to PWM induction waveform. Minor loop peak amplitudes ranging between 50 mT and 0.2 T and frequencies up to 10 kHz are investigated. The results are consistent with the proposed model, to within 5%.

show abstract

Design Optimization of Dual‐Redundancy PM Brushless DC Motors for Torque Enhancement

Dong

Jiang

et al. 2020

IEEJ Transactions Elec Engng

View full text Add to dashboard Cite

Non-member Zili He, Non-member Jinghui Xu, Non-member To enhance the torque of short-time duty permanent magnet (PM) dual-redundancy brushless DC motors (DR-BLDCM) and avoid the motor overheating under a fixed outer diameter and length, a design method based on the optimization of split ratio and stator magnetic density (B m) considering thermal limitations is presented. The global thermal limitation of DR-BLDCM is set by limiting loss density. The local thermal limitation of the winding is set by limiting current density. The thermal limitations are taken as the boundary of torque enhancement design optimization. Both the cold backup and hot backup DR-BLDCM are studied in this paper. By researching the relationship between torque, split ratio, and B m , the optimal combination of split ratio and B m are calculated analytically. The influences of thermal limitations on the maximum torque and the optimal combination are analyzed, and the principle to determine the optimal combination is obtained. The analytically calculated results are verified by finite element simulation, and the error is less than 6.82%. A prototype is manufactured based on analytical design results. The error between the calculated and measured copper loss is 6.96%. The verification results show that the proposed optimization method can fully enhance the torque of DR-BLDCM under the condition of fixed overall dimension and thermal limitations.

show abstract

The Effect of PWM on Rotor Eddy-Current Losses in High-Speed Permanent Magnet Machines

Cited by 47 publications

References 6 publications

Influence of 2D and 3D meshes in FE computation of eddy-current losses in surface PMSMs

Influence of 2D and 3D meshes in FE computation of eddy-current losses in surface PMSMs

Magnetic Loss Versus Frequency in Non-Oriented Steel Sheets and Its Prediction: Minor Loops, PWM, and the Limits of the Analytical Approach

Design Optimization of Dual‐Redundancy PM Brushless DC Motors for Torque Enhancement

Contact Info

Product

Resources

About