Consideration Of Skin Effect Research Articles

Equivalent Circuit Parameters Calculation of Induction Motor by Finite Element Analysis

This paper presents an accurate method to extract parameters of induction motor (IM) from finite element field solutions. A 2-D non-linear time-harmonic application of IM is used in the simulation. And to separate the leakage reactances, the frozen permeability method is used in the static magnetic field simulation for the slot leakage flux calculation. Then, the slot leakage reactance and the harmonic reactance can be determined separately with the consideration of skin effect and the saturation. A defect of modeling the rotation of rotor in time-harmonic field is pointed out in this paper. Finally, the determination of reactances as a function of speed variation is concerned. An application example is provided to confirm the accuracy of the presented method.

Surge Propagation of PWM-Inverter and Surge Voltage on the Motor

The use of PWM-inverter with high switching characteristics to provide the variable frequency supply to motors causes the overvoltage with steep-fronted waveform on the moter terminals.Insulation failure in motor winding can be caused by this steep-fronted transient voltage in inverter drive system. From the point of view of the wave propagation with skin-effect of the cable conductors, these phenomena are not reported in the papers. The main purpose of this paper is to describe the exact surge propagation into consideration of skin-effect of the cable conductors and the wave deflections at inverter and motor terminals.

Consideration of skin effect in high-voltage coaxial systems under transient and steady-state conditions, and its impact on steep travelling waves

The paper discusses the use of a ferromagnetic coating applied to the busbars of an SF6 busduct as a means of controlling disconnect transients. A software travelling wave model is described. The model is based on a frequency-domain characterisation of the busbars in the system. The model accounts for the skin effect in coated materials, and incorporates the effect of discontinuities in the system. The influence of the various coating attributes are noted. The model is shown to perform accurately as a travelling-wave analysis tool. Consideration is also given to the transient skin effect, which is shown to increase the attenuation of transients. Results recorded in a laboratory system with and without ferromagnetic busbars are presented. Ferromagnetics are shown to introduce marked risetime lengthening, as well as an envelope attentuation to disconnect transients.