Mathieu Gerber, Guillaume Callerant, Christophe Espanet, Farid Meibody-Tabar and Noureddine Takorabet
The purpose of this paper is to study the high-frequency impacts of fast switching wide-bandgap transistors on electronic and motor designs. The high-frequency power converters…
Abstract
Purpose
The purpose of this paper is to study the high-frequency impacts of fast switching wide-bandgap transistors on electronic and motor designs. The high-frequency power converters, dedicated to driving high-speed motors, require specific models to design predictively electronic and motors.
Design/methodology/approach
From magnetic and electric models, the high-frequency parasitic elements for both electronics and motor are determined. Then, high-frequency circuit models accounting for of parasitic element extractions are built to study the wide bandgap transistors commutations and their impacts on motor windings.
Findings
The results of the models, for electronics and motors, are promising. The high-frequency commutation cell study is used to optimize the layouts and to improve the commutation behaviours and performances. The impact of the switching speed is highlighted on the winding voltage susceptibility. Then, the switching frequency and commutation rapidity can be both optimized to increase the performance of motor and electronics. The electronic model is validated by experimentations.
Research limitations/implications
The method can be only applied to the existing motor and electronic designs. It is not taken into account in an automized global high-frequency optimizer.
Originality/value
Helped by magnetic and electric FEA calculations where the parasitic element extractions are performed. The switching frequency and commutation rapidity can be both optimized to increase the performance of motor and electronics.
Details
Keywords
Babak Vaseghi, Noureddine Takorabet and Farid Meibody‐Tabar
The purpose of this paper is to present a study and analysis of insulation failure inter‐turn fault in induction machines (IMs).
Abstract
Purpose
The purpose of this paper is to present a study and analysis of insulation failure inter‐turn fault in induction machines (IMs).
Design/methodology/approach
A time stepping finite element method (FEM) analysis is performed for the study of IM with inter‐turn fault and determining the machine parameters (self and mutual inductances) after occurring fault. A simple dynamic model for IM with inter‐turn fault is presented. The model parameters are obtained by FEM analysis. An experimental test is also carried out to verify the results.
Findings
The behavior of IM is studied under various insulation failure inter‐turn fault conditions and severity using FEM. The paper's results help the machine designers to improve the fault tolerance as well the overall design of the machine drive system. It can also be useful for predict and detection of fault in IM.
Practical implications
Predicting and detection of turn faults in IM are in industry very helpful because it avoids the fully damage of IM and it is more easy to repair the machine. Designing a fault tolerant IM is required in some applications for increasing the reliability.
Originality/value
By using FEM for studying the fault, the machine parameters which are calculated with FEM and the study's results are very precise and accurate because the flux fluctuation after occurring fault has been taken into account. On the other hand, the fault model is very fast, global and accurate. It can be used in model‐based health monitoring systems.
Details
Keywords
Eric Duckler Kenmoe Fankem, Noureddine Takorabet, Farid Meibody‐Tabar and François Michel Sargos
The purpose of this paper is to present a coupled finite element (FE) – reluctance network model for a hybrid step motor.
Abstract
Purpose
The purpose of this paper is to present a coupled finite element (FE) – reluctance network model for a hybrid step motor.
Design/methodology/approach
The equivalent permeances of the air‐gap are determined by 2D nonlinear FE computations. The results of the 2D model are used in a 3D analytical model. A spectral decomposition and a nonlinear fitting of the amplitudes of the permeance harmonics are performed to account for both saturation and high order harmonic effects. The nonlinear resolution of the circuit equations is performed with an iterative process. The performances are determined by using the principle of virtual works.
Findings
The method is validated with a 2D FE computation and then applied to a 3D hybrid step motor.
Originality/value
The proposed method enables fast and efficient computations of the performances of hybrid stepping motor.