Inverter Volt-Ampere Capacity Reduction by Optimization of the Traction Synchronous Homopolar Motor

The synchronous homopolar motor (SHM) with an excitation winding on the stator and a toothed rotor is a good alternative to traction induction motors for hybrid mining trucks. The main problem in the design of the SHM electric drives is that the magnetic flux forms three-dimensional loops and, as a result, the lack of high-quality optimization methods, which leads to the need to overrate the installed power of the inverter. This article discusses the procedure and results of optimization of a commercially available 370 kW traction SHM using the Nelder–Mead method. The objective function is composed to mainly improve the following characteristics of the traction SHM: total motor power loss and maximum armature winding current. In addition, terms are introduced into the objective function to make it possible to limit the voltage, the loss in the excitation winding, and the maximum magnetic flux density in the non-laminated sections of the magnetic core. As a result of the optimization, the motor losses and the maximum current required by the motor from the inverter were significantly reduced. The achieved reduction in the maximum current allows the cost of the IGBT modules of the inverter to be reduced by 1.4 times (by $ 2295), and also allows the AC component of the DC-link current to be reduced by the same amount.

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Lamination effects on a 3D model of the magnetic core of power transformers

Open Physics ◽

10.1515/phys-2017-0124 ◽

2017 ◽

Vol 15 (1) ◽

pp. 997-1003

Author(s):

Antonio Poveda-Lerma ◽

Guillermo Serrano-Callergues ◽

Martin Riera-Guasp ◽

Manuel Pineda-Sanchez ◽

Ruben Puche-Panadero ◽

...

Keyword(s):

Magnetic Flux ◽

Flux Density ◽

Experimental Tests ◽

Butt Joint ◽

Magnetic Core ◽

Magnetic Flux Density ◽

Lap Joint ◽

3D Fem ◽

Average Value ◽

Depth Direction

AbstractIn this paper the lamination effect on the model of a power transformer’s core with stacked E-I structure is analyzed. The distribution of the magnetic flux in the laminations depends on the stacking method. In this work it is shown, using a 3D FEM model and an experimental prototype, that the non-uniform distribution of the flux in a laminated E-I core with alternate-lap joint stack increases substantially the average value of the magnetic flux density in the core, compared with a butt joint stack. Both the simulated model and the experimental tests show that the presence of constructive air-gaps in the E-I junctions gives rise to a zig-zag flux in the depth direction. This inter-lamination flux reduces the magnetic flux density in the I-pieces and increases substantially the magnetic flux density in the E-pieces, with highly saturated points that traditional 2D analysis cannot reproduce. The relation between the number of laminations included in the model, and the computational resourses needed to build it, is also evaluated in this work.

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Three-dimensional localization of a rotating magnetic dipole from the Fourier integrals of its magnetic flux density with acceleration data

AIP Advances ◽

10.1063/1.5130150 ◽

2020 ◽

Vol 10 (2) ◽

pp. 025020

Author(s):

A. Chiba ◽

T. Nara

Keyword(s):

Magnetic Flux ◽

Flux Density ◽

Magnetic Dipole ◽

Three Dimensional ◽

Magnetic Flux Density ◽

Acceleration Data ◽

Fourier Integrals

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Magnetic Flux Density under Single Harmonic Distortion

Materials Science Forum ◽

10.4028/www.scientific.net/msf.1034.151 ◽

2021 ◽

Vol 1034 ◽

pp. 151-157

Author(s):

Michał Kaczmarek ◽

Ernest Stano

Keyword(s):

Magnetic Flux ◽

Flux Density ◽

Phase Angle ◽

Harmonic Distortion ◽

Magnetic Core ◽

Magnetic Flux Density ◽

Higher Harmonics ◽

Secondary Voltage ◽

Magnetizing Current ◽

Higher Harmonic

In the paper the change of the magnetic flux density under single harmonic distortion is discussed. Presented results show the dependence of the value of the magnetic flux density in the toroidal magnetic core made from the Ni80Fe20 tape of the phase angle of higher harmonic in relation to the main harmonic of distorted magnetizing current. Moreover, the influence of higher harmonic depends from it frequency and it becomes undetectable above 15th higher harmonic, even if its level reaches 50% of the RMS value of the main harmonic of distorted magnetizing current. Laboratory tests were carried out for the magnetic toroidal core of iCT with a current ratio equal to 300 A / 5 A. The oscilloscope is used to measure waveforms of the excitation current and the secondary voltage through the voltage probes. Build in numerical integration is used to determine the magnetic flux density from secondary voltage. In the case of tested 5th higher harmonic the highest value of the magnetic flux density is obtained for phase angle equal to 90° between main and higher harmonics, while the lowest is obtained for 270°. This depends from the initial phase of the magnetic field strength and results from the integration of distorted secondary voltage with the particular content of higher harmonics.

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The Influence of Stress Ratio on Changes in Magnetic Flux Density around Fatigue Crack Tips of Carbon Tool Steel

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.83.210 ◽

2011 ◽

Vol 83 ◽

pp. 210-215 ◽

Cited By ~ 7

Author(s):

Takashi Honda ◽

Katsuyuki Kida ◽

Edson Costa Santos ◽

Hitonobu Koike ◽

Justyna Rozwadowska ◽

...

Keyword(s):

Magnetic Flux ◽

Crack Growth ◽

Flux Density ◽

Tool Steel ◽

Fatigue Cracks ◽

Three Dimensional ◽

Magnetic Flux Density ◽

Hall Probe ◽

Steel Component ◽

Stress Ratios

Fatigue failure of steel occurs when cracks form in a component and continue to grow to a size large enough to cause fracture. In order to understand the strength of a steel component, it is important to locate these cracks. We developed a scanning Hall probe microscope (SHPM), equipped with GaAs film sensors to observe fatigue cracks at room temperature in air while they were growing. In our previous works [1,2], the correlation between crack growth and magnetic field in high carbon tool steels (JIS SKS93 and JIS SUJ2) were determined. We also reported the sensitivity of the SHPM equipped with a three-dimensional line-probe that was developed to decrease the sensor gaps. By using the line-probe sensor we succeeded to measure the magnetic flux density distributions in very close proximity to the specimen’s surface. However, in order to further understand the relation between magnetic flux density and crack growth, other materials, microstructures and fatigue test conditions should be evaluated. In the present work, we focus on the effect of stress ratios on the changes of the magnetic flux density in annealed carbon tool steel.

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Magnetic Flux Density Distribution in the Air Gap of a Ferromagnetic Core With Superconducting Blocks: Three-Dimensional Analysis and Experimental NMR Results

IEEE Transactions on Applied Superconductivity ◽

10.1109/tasc.2015.2483599 ◽

2015 ◽

Vol 25 (6) ◽

pp. 1-9 ◽

Cited By ~ 3

Author(s):

Antonio Roque ◽

Duarte M. Sousa ◽

Elmano Margato ◽

Vitor Malo Machado ◽

Pedro J. Sebastiao ◽

...

Keyword(s):

Magnetic Flux ◽

Density Distribution ◽

Flux Density ◽

Dimensional Analysis ◽

Three Dimensional ◽

Air Gap ◽

Magnetic Flux Density ◽

Ferromagnetic Core ◽

Flux Density Distribution

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The Observation of Changes in the Magnetic Field due to the Crack Initiation under Different Stress Ratio Conditions

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.217-218.1408 ◽

2011 ◽

Vol 217-218 ◽

pp. 1408-1413 ◽

Cited By ~ 2

Author(s):

Takashi Honda ◽

Katsuyuki Kida ◽

Edson Costa Santos ◽

Justyna Rozwadowska ◽

M. Uryu

Keyword(s):

Magnetic Field ◽

Magnetic Flux ◽

Crack Growth ◽

Flux Density ◽

Fatigue Cracks ◽

Three Dimensional ◽

Magnetic Flux Density ◽

Hall Probe ◽

Steel Component ◽

Stress Ratios

Fatigue failure of steel occurs when cracks form in a component and continue to grow to a size large enough to cause fracture. In order to understand the strength of a steel component, it is important to locate these cracks. We developed a scanning Hall probe microscope (SHPM) equipped with GaAs films sensors and observed fatigue cracks at room temperature in air while they were growing. In our previous works, we determined the correlation between crack growth and magnetic field in high carbon tool steels (JIS SKS93 and JIS SUJ2). We also reported the sensitivity of the SHPM equipped with a three-dimensional line-probe that was developed to decrease the sensor gaps. By using the line-probe sensor we succeeded to measure the magnetic flux density distributions in very close proximity to the specimen’s surface. However, in order to further understand the relation between magnetic flux density and crack growth, other materials, microstructures and fatigue test conditions should be evaluated. In the present work, we focus on the effect of stress ratios on the changes of the magnetic flux density in annealed carbon tool steel.

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Application of the Vector Finite Element Method to 3D Magnetohydrodynamics

Volume 1: Fora, Parts A, B, C, and D ◽

10.1115/fedsm2003-45442 ◽

2003 ◽

Author(s):

Masaaki Matsumoto ◽

Takahiko Tanahashi

Keyword(s):

Finite Element Method ◽

Finite Element ◽

Magnetic Flux ◽

Flux Density ◽

Three Dimensional ◽

Magnetic Flux Density ◽

Shape Functions ◽

Vector Finite Element Method ◽

Vector Finite Element ◽

Element Method

It is well known that the vector finite element method is one of the powerful tools for solving electromagnetic problems. The vector shape functions that are consist of the facet and the edge vector shape functions have a lot of characteristics. One of them is automatic conservation of the magnetic flux density in analyzing the Induction equations without iterative correction. In the present paper the vector finite element method is applied to the problems of magnetohydrodynamics. Three-dimensional natural convection in a cavity under a constant magnetic field is analyzed numerically using the GSMAC finite element method for flow field and temperature field and the vector finite element method for the Induction equations. The computational results are good agreement with those obtained using B method that is one of the iterative methods to satisfy the solenoidal condition for the magnetic flux density of the Induction equations.

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Numerical Simulation and Analysis on Magnetizing Exciter for Magnetic Flux Leakage

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.474-476.1187 ◽

2011 ◽

Vol 474-476 ◽

pp. 1187-1190

Author(s):

Qiang Song

Keyword(s):

Magnetic Flux ◽

Permanent Magnet ◽

Flux Density ◽

Pipe Wall ◽

Three Dimensional ◽

Magnetic Flux Leakage ◽

Magnetic Flux Density ◽

Outer Diameter ◽

Element Analysis ◽

Flux Leakage

Magnetic flux leakage (MFL) is a non-destructive testing method used to inspect the pipe and magnetization of the pipe wall to saturation is essential for anomalies to be reliably and accurately detected and characterized. Axial components of magnetic flux density obtained during the MFL inspection have been simulated using three-dimensional finite element analysis and the effects of magnetizing exciter parameters on magnetic flux density are investigated. The pipe modeled in this paper has an outer diameter of 127mm (5 in.) with a wall thickness of 9 mm (0.354 in.). According to numerical simulations, an increase in the magnetic flux density of pipe wall is observed with an increase in the permanent magnet length and height. It clearly illustrates that Nd-Fe-B permanent magnet assembly with 70 mm length and 40 mm height may magnetize pipe wall to near saturation.

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