A Multi-Sliced Finite Element Model for Induction Machines Incorporating Inter-bar Current

Holik,; Dorrell, David G.; Lombard,; Thougaard,; Jensen,

doi:10.1109/ias.2006.256620

Cited by 10 publications

(5 citation statements)

References 12 publications

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“…The performance is investigated for two-pole 400-V three phase 2.2-kW motor [1]. The unskewed two pole squirrel cage induction machine has 24 stator slots and 16 rotor bars with all stator coils connected in series.…”

Section: Modelling Of Induction Motor With Stator Faultsmentioning

confidence: 99%

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A finite-element model for induction machines incorporating winding faults

Holik

2010

5th IET International Conference on Power Electronics, Machines and Drives (PEMD 2010)

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The paper shows how finite element model may be used to simulate the effect of short circuit fault in the stator winding of multiphase cage induction machine [1][2][3][4]. The proposed analysis is carried out for incident faults and the 3-phase winding currents are investigated. Since the stator winding short circuit faults are one of the most common and potentially destructive electrical faults in induction motors a short circuit in one coil is considered in this study. The Flux 2D numerical model is validated against experimental results and analytical simulations in PC-IMD [2].

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Section: Modelling Of Induction Motor With Stator Faultsmentioning

confidence: 99%

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mentioning

confidence: 99%

A finite-element model for induction machines incorporating winding faults

Holik

2010

5th IET International Conference on Power Electronics, Machines and Drives (PEMD 2010)

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“…Hence, it may be postulated that in a more saturated machine (with associated higher fundamental losses) the additional stray losses due to PWM switching, may be less significant than in the case of a machine with a lower overall saturation level. Recent papers have also investigated the impact of interbar currents on slip frequency losses in skewed machines [11], [12], [13]. At these low frequencies, there is a complex relationship between interbar resistance and interbar loss, as the current flow at low frequency is limited by both the resistance and reactances in the rotor circuit.…”

Section: Introductionmentioning

confidence: 97%

Factors Affecting Losses in Induction Motors with Non-Sinusoidal Supply

Boglietti

Cavagnino

Knight

et al. 2007

2007 IEEE Industry Applications Annual Meeting

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This paper presents the results of an investigation into the factors affecting losses in induction motors operating with non-sinusoidal supply. It is well known that the losses in machines increase when a non-sinusoidal supply is used. However, the specific causes of the increase in loss and resultant techniques required to mitigate these losses are not fully known. The paper investigates the efficiency of an induction motor under different loading and supply conditions. As expected losses are a function of fundamental voltage waveform, load condition and PWM switching conditions. It is also shown that the additional stray loss caused by PWM supply (when compared to sinusoidal supply) is a function of these factors.

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“…One possibility is performing a full 3D FEM analysis. Although different 3D FEM packages are available, 3D modeling of SPMSMs with skewed rotor is not easy yet due to the complex geometry, demanding computational burden [50] as well as required resources [51]. For these reasons this approach is inappropriate for everyday design, especially for medium and large machines where a large number of nodes are required.…”

Section: Finite Elements Model (Fem) Of Healthy Spmsmmentioning

confidence: 99%

“…There exist also other techniques to deal with skewed machines. For example, in [50] a 2D FEM analysis consisting on separated 2-D models of rotor and stator, which are coupled by floating boundary conditions in dependence with skewing and angular rotor position, is carried out.…”

Section: Finite Elements Model (Fem) Of Healthy Spmsmmentioning

confidence: 99%

Electrical and magnetic faults diagnosis in permanent magnet synchronous motors

Urresty Betancourt

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Permanent magnet synchronous motors (PMSMs) are an alternative in critical applications where high-speed operation, compactness and high efficiency are required. In these applications it is highly desired to dispose of an on-line, reliable and cost-effective fault diagnosis method. Fault prediction and diagnosis allows increasing electric machines performance and raising their lifespan, thus reducing maintenance costs, while ensuring optimum reliability, safe operation and timely maintenance. Consequently this thesis is dedicated to the diagnosis of magnetic and electrical faults in PMSMs. As a first step, the behavior of a healthy machine is studied, and with this aim a new 2D finite element method (FEM) modelbased system for analyzing surface-mounted PSMSs with skewed rotor magnets is proposed. It is based on generating a geometric equivalent non-skewed permanent magnet distribution which accounts for the skewed distribution of the practical rotor, thus avoiding 3D geometries and greatly reducing the computational burden of the problem. To diagnose demagnetization faults, this thesis proposes an on-line methodology based on monitoring the zero-sequence voltage component (ZSVC). Attributes of the proposed method include simplicity, very low computational burden and high sensibility when compared with the well known stator currents analysis method. A simple expression of the ZSVC is deduced, which can be used as a fault indicator parameter. Furthermore, mechanical effects arising from demagnetization faults are studied. These effects are analyzed by means of FEM simulations and experimental tests based on direct measurements of the shaft trajectory through self-mixing interferometry. For that purpose two perpendicular laser diodes are used to measure displacements in both X and Y axes. Laser measurements proved that demagnetization faults may induce a quantifiable deviation of the rotor trajectory. In the case of electrical faults, this thesis studies the effects of resistive unbalance and stator winding inter-turn short-circuits in PMSMs and compares two methods for detecting and discriminating both faults. These methods are based on monitoring and analyzing the third harmonic component of the stator currents and the first harmonic of the ZSVC. Finally, the Vold-Kalman filtering order tracking algorithm is introduced and applied to extract selected harmonics related to magnetic and electrical faults when the machine operates under variable speed and different load levels. Furthermore, different fault indicators are proposed and their behavior is validated by means of experimental data. Both simulation and experimental results show the potential of the proposed methods to provide helpful and reliable data to carry out a simultaneous diagnosis of resistive unbalance and stator winding inter-turn faults.

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A Multi-Sliced Finite Element Model for Induction Machines Incorporating Inter-bar Current

Cited by 10 publications

References 12 publications

A finite-element model for induction machines incorporating winding faults

A finite-element model for induction machines incorporating winding faults

Factors Affecting Losses in Induction Motors with Non-Sinusoidal Supply

Electrical and magnetic faults diagnosis in permanent magnet synchronous motors

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