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MagNet Application Pages

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3D analysis of induction melting furnaces with a cold crucible

The furnace crucible is made of water cooled copper. The use of water cooled crucible, instead of the traditional ceramic one, sharply reduces contamination of the molting load. The furnaces with the cold crucible is now broadly used for melting super-pure metals and alloys. (This was originally presented at Engage 2015).

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3-phase Transformer

The model presented here is the simulated results of the ohmic losses and flux density of a 3 phase transformer with a three limbed paramagnetic core. The symmetry in the z-axis has been used to minimize the problem size and accelerate solution time. The coils are made of three concentric layers of different thickness.

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Accurately modeling the skewed rotor of an Induction Motor

The induction motor analysed here is a typical three-phase motor. The rotor is skewed; this is easily created and accurately modeled. The stator windings in this model are realistic involute shapes, created with the multi-segment sweep option; accurately modeled coils means that end effects can be studied. The periodic boundary condition allows the modeler to take advantage of symmetries; in this case, only a 60-degree section is modeled, reducing the problem size by a factor of 6.

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Actuator with Diode

This actuator example demonstrates the power of a fully integrated MagNet’ Transient 3D with motion solver which simultaneously solves the circuit equations, the field equations on the finite element mesh, and the equations of motion. All three sets of equations include some sort of non-linearity. For the circuit the non-linear element is the diode. The finite element solver must deal with non-linear magnetic materials, and the motion solver handles the instantaneous reversal of velocity, which occurs when the plunger bounces off a bumper.

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Analyzing a loudspeaker design

A basic analysis of a loudspeaker design consists of analyzing the magnetostatic properties of a 2D axisymmetric design. In certain cases, 2D analysis is insufficient because of symmetry breaking features, for example, segmented magnets. In this case, a 3D model is needed. The same analyses can be performed in 3D as with the 2D analysis package.

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Analyzing a loudspeaker's voice coil response to a signal

In this example, we have analyzed the voice coil response to a signal by using MagNet's 2D Transient with motion solver. The solver includes coupling to the mechanical equations of motion, so that the movement of a component of a device (for example, the movement of the voice coil) is accurately simulated. The mechanical effects can include friction, inertia, mass, springs, gravitation, etc

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Analyzing the internal mechanics of a watch stepper motor

Presented here is the internal mechanics of a watch employing a stepper motor. The watch is simulated using Infolytica’s Transient 3D with Motion solver. The device consists of a steel frame (12.1 mm across) with a stranded coil wrapped around it. The rotor of the stepper motor is made entirely of a neodymium permanent magnet with a fixed direction of magnetization. Instead of modeling all of the underlying gears attached to the rotor, a moment of inertia is applied to correctly simulate the motion.

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Axial Flux Disk Induction Machine

MagNet 3D Transient with Motion solver was used to model both a run-up to synchronous speed and also to create a torque-speed curve. This particular machine provided the opportunity to compare the MagNet results against measurements made on the real device, and to also show the accuracy and value of simulation with MagNet. This type of machine is often specified when rapid changes in operating speed are required or the short axial length of the machine is crucial. The simulation results and comparison to measured date are presented.

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