Interactive models of electrical machines

Downes, D, 2003. Interactive models of electrical machines. PhD, Nottingham Trent University.

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Abstract

Custom algorithms and stand-alone software have been originated that allow the automatic generation of complex Magnetic Equivalent Circuit (MEC) models from the description of a rotary machines physical geometry and materials. The models are automatically generated in a format that can be utilised in a standard circuit simulator package, such as SPICE, allowing the simulation of the full electrical, magnetic and mechanical interaction.

Fully interactive machine models have been developed by extending Magnetic Equivalent Circuits (MECs) to include mechanical torque by the application of the virtual work principle. Using a common finite element B-H formula, the models are further enhanced by the incorporation of non-linear permeance. These equivalent models use standard circuit components that are available in most circuit solver packages making them transportable and vendor independent.

A novel stand-alone software package has been created that simplifies the generation of the complex MEC models. By describing the machine geometry, flux paths and material characteristics in a simple file an electrical equivalent circuit can be automatically generated at different levels of abstraction, depending on the input information. The software allows the machine's geometry to be viewed and, after simulation, the flux information can be back annotated into the geometry viewer for further design refinement.

The modelling technique has been verified by automatically generating and simulating a MEC model of a 3-phase induction motor; this was checked against practical results obtained from a test-bed consisting of an induction motor and associated load. A further validation of the MEC modelling technique checks for consistency by ascertaining that the energy flow between the electrical, magnetic and mechanical sections balance for a synchronous generator and synchronous motor.

The automatic production of complex Magnetic Equivalent Circuits of rotary machines produces a realistic model giving a high degree of confidence in the simulation results when combined with the power and control electronics in a SPICE type simulator.

Item Type:	Thesis
Creators:	Downes, D.
Date:	2003
ISBN:	9781369314816
Identifiers:	Number Type PQ10183215 Other
Divisions:	Schools > School of Science and Technology
Record created by:	Jill Tomkinson
Date Added:	21 Sep 2020 15:42
Last Modified:	03 Aug 2023 10:54
URI:	https://irep.ntu.ac.uk/id/eprint/40853

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