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Motors & Generators
Induction Machine
MotorSolve IM: finding solutions to a wide variety of induction motor design and simulation problems
MotorSolve IM offers four types of analysis options; Equivalent circuit based analysis, AC analysis, PWM and Motion analysis. At different degrees of approximation, complexity and utility, they offer solutions to a wide variety of induction motor design and simulation problems. In this application page, some simple examples of the utility of these methods are presented.
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Equivalent Circuit Analysis in MotorSolve IM: computing the lumped parameters of induction machine models
MotorSolve IM performs no-load saturation, locked-rotor and impedance test simulations to evaluate the circuit parameters. The tests are based on FEA solves and include accurate estimation of core losses. In this analysis mode, computation of the lumped parameters allows the user to specify the leakage ratios between the rotor and stator. This example demonstrates the equivalent circuit based analysis of a 17 bar - 24 slot machine.
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Motion analysis in MotorSolve IM: FEA-based dynamical simulation
When induction machines operate under magnetic saturation, analytic approximations are unable to accurately predict performance. Fine changes may also be very difficult to model analytically. Hence, at this stage, FEA based analysis is usually the method of choice by machine engineers. An automated FEA-based dynamical simulation option has been included in MotorSolve IM for this purpose. This application page provides some details of this analysis option along with some examples.
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PWM analysis in MotorSolve IM: gauging the performance of induction motors for realistic drive circuits
Motors and generators The PWM feature of MotorSolve IM is designed to assist the machine engineer to gauge the performance of induction motors for realistic drive circuits. To this end, 3-phase bridge circuits with delta and space vector modulation (with Wye/Delta connection) options are offered that allow the user to calculate a large array of entities and compare results with ideal drive simulation. The methodology and some examples of results using PWM simulations are presented in this application page.
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AC analysis using MotorSolve IM
MotorSolve IM AC analysis type takes into account regions of linear and nonlinear behaviour of the lumped parameters and automatically adapts to such variations with extra sample points in such regions of the parameter space. Variations of the lumped parameters at various slips are also taken into account. Some calculations for a 17 bar - 24 slot squirrel cage induction machine are presented.
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Overview of MotorSolve IM for Induction Motors
MotorSolve IM is a comprehensive tool within which modeling, design iteration and design validation can be carried out for induction machines. To facilitate this, user friendly and powerful modeling features as well as multiple types of analysis options of varying degrees of approximation and complexity have been implemented. These include equivalent circuit based analysis, AC analysis, PWM and dynamical motion simulations. Provided below is a summary of MotorSolve IMs' modeling and analysis capabilities.
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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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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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