Date of Award

Spring 1996

Document Type

Thesis - Restricted

Degree Name

Master of Science (MS)

Department

Mechanical Engineering

First Advisor

Arkadan, Abdul-Rahman A.

Second Advisor

Brown, Ronald H. Brown

Third Advisor

Demerdash, Nabeel A.O.

Abstract

This work focuses on the development of a modeling environment to predict the effects of chopping on the performance of switched reluctance motor drives. The model basically consists of two main parts: a finite element analysis and a state space model. The first part involves the use of magnetic vector potential (MVP) based finite element (FE) formulation and computation of two dimensional (2D) nonlinear magnetostatic fields. The field solutions result in the machine inductances by means of an energy and current perturbation method. These parameters are then used in a lumped parameter state space model in order to predict the performance of the machine drive system. The analysis utilizes an iterative approach to update the inductance profiles by means of continuous cycling through the two parts of the modeling environment until the desired degree of convergence is achieved. Next, using the FE field solutions, the laminated motor iron core losses, rotor and stator losses, are subsequently determined. In addition, the impact of chopping on the machine inductances, armature currents, and torque profiles is determined, as well as the impact on the lamination's core losses, power conditioner switching losses, and the system efficiency. Finally, the dynamic performance characteristics of the motor drive system are verified by comparison to experimental data.

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