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Modelling and analysis of asynchronous and synchronous torques in split-phase induction machines

Andersen, Peter Scavenius (2008) Modelling and analysis of asynchronous and synchronous torques in split-phase induction machines. PhD thesis, University of Glasgow.

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Abstract

In this thesis, the nature of asynchronous and synchronous torques in a split-phase induction machine is investigated and quantified. The equivalent circuit for this type of machine is derived using the rotating field theory. It is extended to include harmonic effects. Using this model, winding harmonics and permeance harmonics may be calculated independently of each other so that the model can be used to analyse asynchronous torques from winding harmonics as well as synchronous torques from permeance harmonics. These are calculated separately. The asynchronous torques appear as perturbations in the steady-state torque-speed curve while the synchronous torques only appear at specific speeds. The synchronous torques are superimposed onto the torque-speed curves to model both effects together. The model predictions are compared against test results using purpose-built experimental machines together with production machines. These have varying rotor bar number and skew. Different methods are used to assess the synchronous torques. It is found that measuring synchronous locking torque is not a straightforward matter; however, reasonable agreement is found between calculation and measurement. The work highlights the need for the correct choice of stator and rotor slot numbers together with the effect skew has on reducing the synchronous and asynchronous locking torques.

Item Type: Thesis (PhD)
Qualification Level: Doctoral
Keywords: Single-Phase Induction Machines, Winding Harmonics, Permeance Harmonics, Asynchronous Torques, Synchronous Torques
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Colleges/Schools: College of Science and Engineering > School of Engineering
Supervisor's Name: Dorrell, Dr David G
Date of Award: 2008
Depositing User: Mr Peter Scavenius Andersen
Unique ID: glathesis:2008-82
Copyright: Copyright of this thesis is held by the author.
Date Deposited: 29 Jan 2008
Last Modified: 10 Dec 2012 13:15
URI: http://theses.gla.ac.uk/id/eprint/82

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