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Abstract

This thesis is concerned with the prediction and study of the performance characteristics of a single-sided linear induction motor both theoretically and experimentally.

In the work described here a field solution is investigated using one-, two- and three-dimensional analyses. In each of these analyses two models for the linear induction motor are studied which differ in the way of representing the primary windings.

The primary winding of the first model is represented by a current sheet which covers the teeth-slots and overhang zones, and the stator iron is extended up to the ends of the overhang
winding. In the second model, the primary winding over the teeth-slots is represented by a homogenous anisotropic conductor of finite thickness which exhibits different permeabilities in directions parallel with and perpendicular to the airgap. The overhang winding is represented by a normal homogenous isotropic mass. The stator iron in this model extends only over its actual width. This model makes possible an adequate consideration of slot leakage.

In these analyses, numerical solutions describing the magnetic vector potential are obtained by the finite difference method using a successive over-relaxation iterative technique.

The three-dimensional analytical models take account of the boundaries and discontinuties in all three directions of the linear induction motor. Special studies on the boundaries of these models and their line- and dot-corners are made.

In these models, linear induction motors with and without backing iron are examined for different speeds up to 282 Km/h.

In order to verify the validity of the theoretical results of the motor without backing iron, a test rig is designed and constructed. Both theoretical and experimental results are shown for comparison purposes.

A new pole-by-pole equivalent circuit of the linear induction motor is presented. It is based on a one-dimensional analysis and takes account of longitudinal end effects. A comparison of the predicted performance is made between the equivalent circuit and the field solution of the linear induction motor with backing iron.

The state variables of the performance presented in this thesis include the forces, power, power factor, efficiency, flux and flux density distribution and a terminal voltage which is calculated numerically for each of the three phases.

Other aspects investigated are the effects of changing the topology of the machine, the use of a composite rail, the parameters affecting the significance of end effects and constant current and constant voltage drives.

Publication Type:	Thesis (Doctoral)
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) T Technology > TK Electrical engineering. Electronics Nuclear engineering
Departments:	School of Science & Technology > Engineering School of Science & Technology > School of Science & Technology Doctoral Theses Doctoral Theses

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