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High-frequency eddy current effect-considered semi-analytical calculation method for winding loss

A technology of eddy current effect and winding loss, applied in calculation, design optimization/simulation, special data processing application, etc., can solve problems such as long calculation time, and achieve the effect of saving calculation time and reducing calculation workload

Inactive Publication Date: 2018-05-01
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
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  • Application Information

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Problems solved by technology

For this reason, conventional finite element analysis of multi-turn wire coils requires considerable calculation time

Method used

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  • High-frequency eddy current effect-considered semi-analytical calculation method for winding loss
  • High-frequency eddy current effect-considered semi-analytical calculation method for winding loss
  • High-frequency eddy current effect-considered semi-analytical calculation method for winding loss

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Embodiment 1

[0108] image 3 and Figure 4 Homogenized complex permeability The real and imaginary parts of the change curve with the normalized thickness a / δ, where μ r =1. At this point, the multi-turn coil can be considered as a magnetic permeability homogeneous material.

[0109] An inductor is made by winding a copper conductor with a diameter of 0.15mm, and the number of turns is 50 turns. Figure 5 This is the structural diagram of a multi-turn wire coil inductor. The enamelled thickness of the wire is 0.03mm, and the wire is wound on the skeleton made of light-cured resin tube. The model is PRH35-ST2 (diameter: 30mm). The filling factor of the wire is η=62.9%. The AC resistance of the above model is calculated by semi-analytical calculation method, the calculated frequency range is 0Hz~0.25MHz, the complex magnetic permeability of the coil part is equal to 0.422-0.212j, and the static magnetic field analysis results at the frequency of 0.1MHz are as follows Figure 6 As sh...

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Abstract

The invention belongs to the field of inductor design, and particularly relates to a high-frequency eddy current effect-considered semi-analytical calculation method for winding loss. The method comprises the following steps of: obtaining a complex permeability expression of a single isolated circular conductor in a uniform time-harmonic magnetic field; calculating complex permeability of homogenization of a multi-turn circular conductor coil; metering influences which consider a skin effect through importing an impedance corresponding to the skin effect; establishing a two-dimensional finiteelement model, and calculating magnetic field intensity of a space region so as to obtain magnetic field intensity of a conductor region and an air region; calculating total magnetic field energy eddycurrent loss stored by the conductor region and the air region by combining the magnetic field intensity, obtained via static magnetic field finite element simulation, of the conductor region and theair region; and calculating eddy current loss of a multi-turn conductor region, and summating skin effect eddy current loss and proximity effect loss to obtain total loss of a winding region. The method can be used for determining winding loss of multi-turn conductor coils and effectively decreasing the calculation workload, and is beneficial for engineering application.

Description

technical field [0001] The invention relates to the field of inductor design, in particular to a semi-analytic calculation method for winding loss considering high-frequency eddy current effect. Background technique [0002] For multi-turn coils in motors and inductor devices, due to the increase in driving frequency, it is very important to use numerical calculation methods to evaluate the eddy current loss of multi-turn coils. In addition, the rapid development of wireless energy transmission systems and eddy current sensors also puts forward new requirements for the rapid calculation of the frequency characteristics of multi-turn coil impedance. When multi-turn coils of wire pass a time-varying current, they are exposed to magnetic fields induced by their own currents as well as neighboring currents, which further induce eddy currents in the conductors. The eddy currents prevent the magnetic field from penetrating into the conductor, and generate eddy current losses, whi...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 李琳陈彬
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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