The Miniature Two Phase Induction Motor as an Element of an Alternating Current Servosystem


After an introduction in which the suitability of this particular machine for servosystem application is explained and its specification of performance outlined,reasons are put forward for the use of its resistance and metric tensors as a mathematical representation of the machine in system simulation. A complete analysis is then formulated for the machine covering true dynamic and steady state operation and extended to include the effects of space harmonics in the machine's magnetomotive force waveform. From this analysis the mathematical model, in the form of the metric and resistance tensors, is derived. New methods of calculating the elements of these tensors are proposed and also a practical method, employing a new locus diagram for the induction motor, for measuring these elements. For the determination of this locus diagram and for eventually corroborating the predicted performance of the machine with it's measured performance, a special dynamometer is designed and made and suitable measuring techniques evolved. As a result of the interpretation of the new locus diagram for a test motor, an improved representation of the rotor of the miniature induction motor is discovered and a new method of determining the effective airgap, which differs from the mechanical dimension due to the effects of machining stresses in the core material, is found. A mathematical model incorporating these improvements and derived from the locus diagram is presented. This model is compared with that obtained from the design data and is then used to predict the full range of performance,both steady state and dynamic, of the test motor. By comparing the measured performance with the predicted performance the efficacy of the model obtained from the locus diagram is established and, thereby, that of the model determined by calculation in the design stages. This comparison serves also to ratify the method of analysis used. The study ends with a brief catalogue of future work consequent upon that of this investigation.

Divisions: College of Engineering & Physical Sciences
Additional Information: Copyright © J. Ward, 1974. J. Ward asserts their moral right to be identified as the author of this thesis. This copy of the thesis has been supplied on condition that anyone who consults it is understood to recognise that its copyright rests with its author and that no quotation from the thesis and no information derived from it may be published without appropriate permission or acknowledgement. If you have discovered material in Aston Publications Explorer which is unlawful e.g. breaches copyright, (either yours or that of a third party) or any other law, including but not limited to those relating to patent, trademark, confidentiality, data protection, obscenity, defamation, libel, then please read our Takedown Policy and contact the service immediately.
Institution: Aston University
Uncontrolled Keywords: miniature two phase induction motor,alternating current servosystem
Last Modified: 28 Jun 2024 07:08
Date Deposited: 12 May 2010 12:46
Completed Date: 1974-02
Authors: Ward, John

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