Infolytica Corp. enewsletter
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August 25, 2011 - Issue #56

In this issue

Launch of MotorSolve with Thermal Analysis Announced

Simulating Multiple Moving Parts of a Magnetic Gear

Demonstrating a variation of the MagLev suspension system

Transformer Bushings

Analysis of a Variable Reluctance Sensor Design

Optimization - Minimizing Loudspeaker Mass

Surge Arrester: Minimizing Electric Field Stress in Resistors

An Electrostatic Simulation of a Surge Arrester

TEAM Workshop Problem 25: Shape Optimization Of A Die Press

Design and Modeling of Dual Fed Asynchronous Generators: Application to Wind Power Generation


Launch of MotorSolve with Thermal Analysis Announced

Magnetic Gear Infolytica Corporation recently announced plans to include an extensive thermal analysis module in the next release of MotorSolve, which is due out by fall 2011. With this latest addition, it will be possible to evaluate the impact of temperature and different cooling methods on the performance of brushless, PMAC and induction machines.

The thermal analysis module will be a cost option that enhances the accuracy of the existing result computations by accounting for heating and cooling on performance as well as offering new temperature related outputs.

Read the full press release
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New MotorSolve TE now available  

Updated Design Examples

We have recently updated some of the design examples posted on infolytica.com in order to better reflect the functionality available in MagNet, ThermNet, ElecNet and OptiNet version 7.

Take a look at these refreshed examples to see new field plots, animations, sample models and results!

Simulating Multiple Moving Parts of a Magnetic Gear

Magnetic Gear
In this example, the magnetic planetary gear assembly is analogous to an equivalent mechanical system, with the inner rotor acting as the sun gear, the outer rotor as the ring gear, and the stationary steel pole pieces acting as planetary gears (it is the magnetic field that spins, not the pole pieces themselves). There are 2 pole pairs on the inner rotor and 5 pole pairs on the outer rotor, making the gear ratio of this assembly 2.5:1.

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Demonstrating a variation of the MagLev suspension system

MagLev suspension
The MagLev suspension system shown here is based on repulsion forces from dynamically induced eddy currents. The idea is to use the same set of coils for both levitation and propulsion. The coil structure is in a transverse flux configuration similar to that used in the prototype NASA MagLev for a shuttle launch system. The performance of this machine is simulated using MagNet's Transient 3d with Motion solver.

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Transformer Bushings

Transformer Bushings
The design and simulation of transformer bushings have always been challenging because modeling these structures was computationally quite expensive.

In this example, the transformer busing consists of nine foils of various lengths that are placed inside of epoxy-resin impregnated paper (ERIP) at specific locations in order to minimize the maximum electric field, E.

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Analysis of a Variable Reluctance Sensor Design

Variable Reluctance Sensor
Variable reluctance sensors are used to measure position and speed of moving metal components. This sensor consists of a permanent magnet, a ferromagnetic pole piece, a pickup coil, and a rotating toothed wheel.

As the wheel rotates, the reluctance of the flux path through the coil changes, and the flux linkage through the coil changes, which results in a change in voltage that is measured by an external circuit.

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Optimization - Minimizing Loudspeaker Mass

Loudspeaker Model
This example demonstrates the use of OptiNet with MagNet for the optimization of a loudspeaker design based on its electromagnetic characteristics. MagNet is used to compute the electromagnetic fields, and OptiNet is used to find the optimum design as specified by the user's requirements. The loudspeaker model shown here is made of two iron pieces and a permanent magnet.

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Surge Arrester: Minimizing Electric Field Stress in Resistors

Surge Arrestor
The voltage distribution along the resistors in a surge arrester is uneven due to stray capacitances. It is possible to reduce the maximum electric field stress by a careful choice of position for the grading rings.

In this example, OptiNet is used with ElecNet to find where the rings should be placed, and what their dimensions should be, in order to minimize the total electric field stress in the resistors.

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An Electrostatic Simulation of a Surge Arrester

Surge Arrestor
The surge arrester modeled in this example is an arrester with 2 grading rings. It is formed of 2 electrodes: one at the top formed by a conducting metal rod and 2 conducting metal grading rings, and the other at the bottom forming the pedestal of the surge arrester

An electrostatic (Capacitive) simulation of the surge arrester is presented. The metal-oxide resistors were given a relative permittivity of 800, while a permittivity of 5 was chosen for the porcelain housings.

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TEAM Workshop Problem 25: Shape Optimization Of A Die Press

Die Press Model
A large electromagnet that can set up a strong magnetic field is used to orient the magnetic powder in a component. The orientation and strength of the magnetic field should be controlled in order to obtain the required magnetization, in the component that is being magnetized. In this device, the objective is to find the size of the inner die mold and the shape of the outer die mold in order to obtain the desired magnetic field in the cavity shown in the figure. OptiNet will find the radius for the inner mold and the elliptical shape for the outer molds that satisfy these design objectives.

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Design and Modeling of Dual Fed Asynchronous Generators: Application to Wind Power Generation

Tutorial at ECCE 2011
September 18, 2011

The design and modeling of dual fed induction generators is considered in this tutorial. The topic will be covered by using examples that are focused primarily for wind power generation applications. The tutorial will begin with an overview of such systems and component identification. The design and modeling methodologies and challenges of various components will be discussed then. This will be followed by discussions on the design of induction generators and their field oriented control strategies. Topics covered will include design strategy for initial design (sizing, material and winding designs), load point analysis, and machine performance etc. Multi-physics aspect (electromagnetic, thermal, and mechanical) of the design algorithms will also be discussed. Aside from generator design, there will also be some general discussions on inverter topology and simulation specific to such devices. Modern computer aided design software will be used to illustrate the various design and simulation strategies related to such systems. As well, a literature review will accompany the presentation to highlight the state-of-the-art of such systems.

Please visit the website for ECCE 2011 for more details about this tutorial.

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Events

VPPC 2011
Sept. 6-9, 2011
Chicago, IL
Exhibitor

ECCE 2011
Sept. 17-22, 2011
Phoenix, AZ
Exhibitor & Workshop

Energy Efficiency Expo
Sept. 20-21, 2011
Nashville, TN
Exhibitor

MagNet Training Course
November 15-17, 2011
Montreal, QC