Theoretical Analysis of AC Resistance in Coil Using Magnetoplated Wire

Shinagawa, Hiroki; Suzuki, Takayuki; Noda, Masahiro; Shimura, Yusuke; Enoki, Shigemi; Mizuno, T.

doi:10.1109/tmag.2009.2021948

Cited by 47 publications

(24 citation statements)

References 17 publications

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“…Thus, a reduction of losses by approx. 33-35.54 W was obtained by placing strands in the centre of the slot, and moved them further from the tooth side to back iron where flux leakage crossing the slot window is smaller [4]. Furthermore, end-winding may produce significant proximity losses and thus influence eddy-currents circulation in conductors [17].…”

Section: Resultsmentioning

confidence: 99%

“…From (2-3) an equivalent bulk value of the ac winding losses under sinusoidal RMS current is found by (4). This bulk value of the ac copper loss is used to determine the increase of resistance or copper loss under ac excitation as compared to dc operation.…”

Section: Copper and Iron Losses Analysis In A Stator Corementioning

confidence: 99%

“…Due to symmetry, the study domain of FE stator models can be limited to half (symmetry in XY plane). The ferrite core size determines the large opening slot hence the copper losses in strands placed near the slot opening region are suspected to produce huge amount of eddy-current due to flux leakage [4,10]. Winding losses can be reduced by properly arranged conductors and designed shape of teeth including the size of slot opening.…”

Section: Finite Element Modelsmentioning

confidence: 99%

“…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%

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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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Section: Resultsmentioning

confidence: 99%

Section: Copper and Iron Losses Analysis In A Stator Corementioning

confidence: 99%

Section: Finite Element Modelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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“…2 and 3 show the principles of identifying the type of the sensor probe and the displacement x, respectively. The quality factor of the sensor probe, Q EC , is given by [3] …”

Section: Identification Principlementioning

confidence: 99%

Method for Identifying Type of Eddy-Current Displacement Sensor

et al. 2011

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Eddy-current (EC) displacement sensors are used in a device for measuring the shaft vibration of turbines. When only the impedance/output voltage (Z/V) converter breaks down, it is necessary to change it with an appropriate Z/V converter by stopping and dismantling the power plant using the discriminant of the sensor probe installed in the neighborhood of the turbine shaft. In this paper, we describe a method for identifying the type of the sensor probe and the displacement x from the measuring object to the coil by measuring the impedance characteristics of the sensor probe.Index Terms-Eddy-current displacement sensor, identification method, maximum quality factor, frequency, displacement.

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