Application Examples - Various

Application examples with Model Files available
Optimisation of a die press
Demonstrating a variation of the MagLev suspension system
Simulating Multiple Moving Parts of a Magnetic Gear
Boost Converter Inductor Analysis
Optimisation of a die press (TEAM Problem 25)
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 magnetisation in the component that is being magnetised. 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.

The following is based on the Testing Electromagnetic Analysis Methods (TEAM) Problem #25: Optimisation of a die press. The benchmark can be found on the International Compumag Society's website (TEAM Problems).

Open Report (Model 0087)

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Demonstrating a variation of the MagLev suspension system
The basic concept of the magnetically levitated train or "MagLev" dates back many decades. There are two basic types of MagLev suspension systems: one based on static forces of attraction, the other based on repulsion forces from dynamically induced eddy currents. This gallery page demonstrates a variation of this second type, which implements the "Magnetic River" concept. The idea is to use the same set of coils for both levitation and propulsion. In the motor shown here, the coil structure is in a transverse flux configuration similar to that used in the prototype NASA MagLev for a shuttle launch system. However, instead of a single-phase source, the coils in this motor are connected to a three-phase supply in sequence to produce a travelling magnetic wave along the track. This is a scale model in which the vehicle is only 36 cm long (about 1 foot).

Open Report (Model 0102)

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Simulating Multiple Moving Parts of a Magnetic Gear
Magnetic and mechanical planetary gear systems have been compared recently with regards to their potential applications. It has been shown that magnetic gears could be potential alternatives to mechanical systems as they allow frictionless torque transmission of potentially larger magnitude than equivalent mechanical gears. This example shows simulations of a magnetic gear system and its performance. 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. The model is shown here.

Open Report (Model 0106)

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Boost converter inductor analysis
Analytic methods are widely used in inductor and coil designs. However, these methods do not fully account for core non-linearity, skin-depth, gaps, 3D, load variations, capacitive and switching effects. In addition, it is difficult to map the non-uniform distributions (hot spots) as shown in the figure. MagNet can address most of these issues save for capacitive and thermal analysis. In this application, it is used to analyse the inductor of a 27 kW boost converter that steps-up an electric vehicle's battery voltage from 200 V to 200 - 650 V range. Two boost circuits utilizing a hysteresis current controlled switch, and a PWM voltage controlled switch are used to regulate the inductor current and output voltage, respectively. The two circuits demonstrate how current and voltage controlled switches can be implemented in MagNet. The analysis includes meshing of the core to account for skin-effects, extracting inductor parameters, use of controlled switches to account for switching effects and loss distribution.

Open Report (Model 0213)

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