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Motors & Generators - Clawpole and Others Application Pages

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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 motor

An axial motor, taken from the book "Direct Current Machines", is simulated using MagNet. The results presented include animations of the current density magnitude in the axial motor and path of the current around the rotor.

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Bearing friction damping in a stepper motor

This stepper motor consists of a stator with eccentric pole faces and a rotor made of samarium cobalt permanent magnet that is magnetized in a fixed direction. The rotor rotates in steps of 180 degrees. Each step in the rotor is due to a short pulse from a current source

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Brushed Motors Design and Analysis

The MotorSolve DCM module provides finite element based analysis for the design of DC brushed motors. The versatility of the DCM module is in its ability to create motors from templates and its advanced electromgnetic analysis capability. The analysis can be used to get standard DC motor characteristics or to get more advanced quantities such as waveforms, harmonic analysis of the waveforms, time-averaged quantities, Field distributions and many more.

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Creating a VHDL-AMS model of a claw-pole alternator

A VHDL-AMS model of a claw-pole alternator is created using the System Model Generator. The SMG creates a Response Surface Model (RSM) of the claw-pole by driving MagNet to execute a number of static solves at different phase currents and rotor positions. This RSM is embedded in the VHDL-AMS file to create a component which is functionally equivalent to the original MagNet model, but which can be evaluated extremely quickly in a transient circuit simulation.

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Current distribution in a Claw-pole Alternator

The device is a claw-pole automobile alternator with a three-phase output winding on the stator. A field coil around the rotor core is used to induce flux in the output windings as the rotor spins.

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Simulating a claw-pole alternator in an automobile electrical system environment

Since a claw-pole alternator can be found under the hood of almost any car, it is one of the most optimized of magnetic machines, balancing manufacturing costs against efficiency. Simulating its dynamic electromagnetic characteristics is challenging, but careful analysis of the results can lead to further improvements. Here, MagNet’s Transient 3d with Motion solver simulates this machine in the environment of an automobile electrical system, including a three-phase diode bridge and a resistive load.

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Switched Reluctance Machine (SRM) 3D FEA Analysis using MagNet

Detailed electromagnetic and mechanical analyses were performed to determine the validity of an Axial Gap Switched Reluctance Machine concept and to provide a direct comparison with the existing conventional Radial Flux Switched Reluctance Machine designed during the Advanced Wave Energy Conversion Project. (This was originally presented at Engage 2015).

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