Analytical Optimization of Solid–Round-Wire Windings

Wojda, Rafal P.; Kazimierczuk, Marian K.

doi:10.1109/tie.2012.2189543

Cited by 128 publications

(65 citation statements)

References 41 publications

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“…There are many publications considering analytical optimization of the winding conductor size for the conductor temperature equal to room temperature [10,[16][17][18][19]. However, commercially available power devices, i.e.…”

Section: Resultsmentioning

confidence: 99%

“…For the high power inductors, from aforementioned losses, significant role plays the winding losses [9][10][11][12][13][14][15][16][17][18][19][20][21][31][32][33][34][35][36]. While core and dielectric loss are decreased by selection of low-loss materials, the winding losses are significantly reduced by optimization of the winding conductor size [16,17,19].…”

Section: Introductionmentioning

confidence: 99%

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Thermal analytical winding size optimization for different conductor shapes

Wojda¹

2015

Archives of Electrical Engineering

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Abstract. The aim of this paper is to derive an analytical equations for the temperature dependent optimum winding size of inductors conducting high frequency ac sinusoidal currents. Derived analytical equations are useful designing tool for research and development engineers because windings made of foil, square-wire, and solid-round-wire windings are considered. Temperature dependent Dowell's equation for the ac-to-dc winding resistance ratio is given and approximated. Thermally dependent analytical equations for the optimum foil thickness, as well as valley thickness and diameter of the square-wire and solid-round-wire windings are derived from approximated thermally dependent ac-to-dc winding resistance ratios. Minimum winding ac resistance of the foil winding and local minimum of the winding ac resistance of the solid-round-wire winding are verified with Maxwell 3D Finite Element Method simulations.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermal analytical winding size optimization for different conductor shapes

Wojda¹

2015

Archives of Electrical Engineering

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“…2. The resistance R w is the ac series winding resistance, L f is the inductance [14]- [19], and C s is the self-capacitance.…”

Section: Choke Impedancementioning

confidence: 99%

Analysis and Design of Choke Inductors for Switched-Mode Power Inverters

Saini

Ayachit

Reatti

et al. 2018

IEEE Trans. Ind. Electron.

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Abstract-This paper presents the design, analytical estimation of power losses, and experimental measurement of choke inductors for switched-mode power inverters. The described approach is applicable to a wide variety of circuits such as Class-E inverters and converters. The expressions required to design the magnetic core in the choke inductor using the area-product ( A p ) method are given. The equations for the dc resistance, ac resistance at high frequencies, and dc and ac power losses are provided for the solid round winding wire. To validate the presented approach, an example class-E zero-voltage switching power inverter with practical specifications is considered. A core with air gap is selected to avoid core saturation in the choke inductor, which conducts dc current and a small ac current. The gapped core power loss density and power loss are estimated using Steinmetz empirical equation. It is shown that the winding power loss due to the dc current is dominant for the given design. A comparison between the area-product A p method and the preexisting core geometry coefficient K g method is presented. The measured magnitude of the inductor impedance has shown that the designed choke is useful up to ten times the switching frequency.

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“…High speed motors at high-frequency sinusoidal current waveform, which can make the effective winding resistance very high and for that reason copper losses are increasing when frequency grows [1,2]. The winding resistance of high speed motor is a result of both skin and proximity effects [2][3][4][5]. The main phenomenon that leads to ac losses is the skin effect which is the tendency for high-frequency currents to flow on the surface of a conductor.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the proximity and skin effects on copper loss in a stator core

Młot¹,

Korkosz²,

Grodzki³

et al. 2014

Archives of Electrical Engineering

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Accurate prediction of power loss distribution within an electrical device is highly desirable as it allows thermal behavior to be evaluated at the early design stage. Three-dimensional (3-D) and two-dimensional (2-D) finite element analysis (FEA) is applied to calculate dc and ac copper losses in the armature winding at high-frequency sinusoidal currents. The main goal of this paper is showing the end-winding effect on copper losses. Copper losses at high frequency are dominated by the skin and proximity effects. A time-varying current has a tendency to concentrate near the surfaces of conductors, and if the frequency is very high, the current is restricted to a very thin layer near the conductor surface. This phenomenon of nonuniform distribution of time-varying currents in conductors is known as the skin effect. The term proximity effect refers to the influence of alternating current in one conductor on the current distribution in another, nearby conductor. To evaluate the ac copper loss within the analyzed machine a simplified approach is adopted using one segment of stator core. To demonstrate an enhanced copper loss due to ac operation, the dc and ac resistances are calculated. The resistances ratio ac to dc is strongly dependent on frequency, temperature, shape of slot and size of slot opening.

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Analytical Optimization of Solid–Round-Wire Windings

Cited by 128 publications

References 41 publications

Thermal analytical winding size optimization for different conductor shapes

Thermal analytical winding size optimization for different conductor shapes

Analysis and Design of Choke Inductors for Switched-Mode Power Inverters

Analysis of the proximity and skin effects on copper loss in a stator core

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