Application Pages

AC analysis of an Induction Machine

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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Analysis 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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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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Design and Analysis of a 2 HP Wound Field Induction Motor

A 4 HP wound field induction motor example is used to demonstrate some of the design and analysis capabilities of MotorSolve IM. The motor contains 30 rotor slots and 36 stator slots. This example showcases the features of MotorSolve IM that allows the user to implement a typical design cycle. This includes automated winding selections, load point analysis, bridge simulations etc.

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Designing 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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Motion analysis of an Induction Motor

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 of an Induction Motor

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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Thermal Analysis of an Induction Motor

In order to predict machine temperatures, the design of the electric machine needs to take thermal factors into account. In this example, a 4kW IM machine is chosen to demonstrate the new thermal analysis features within MotorSolve.

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