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    Sensorless speed measurement in induction motor drives using a double algorithm approach : a thesis submitted to the Institute of Information Sciences and Technology, Massey University, in partial fulfillment of the requirements for the degree of Master of Technology in Information Sciences and Technology
    (Massey University, 2002) Phipps, William Stanley
    Sensorless speed control in induction motor drives is a new emerging field offering many benefits over traditional methods. The thesis examines a method of improving the performance of sensorless speed control systems using a double algorithm approach. The rotor slot harmonics are used to determine the speed of an induction motor. This is possible as the rotor slots produce slot harmonics in the airgap field, which modulate the stator flux linkage at a frequency proportional to the rotor speed. This method, however, has limitations, at low revolutions the harmonics cannot be detected. An empirically derived formula is used to determine the speed of rotation in the speed range where the rotor slot harmonics cannot be used. The rotor slot harmonics are located and the empirical formula determined for a given 0.33HP induction motor. The final proposed system uses both mentioned methods and is simulated to determine the theoretical performance. The speed detection algorithm using the rotor slot harmonics is also implemented, with good results.
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    Process design testing using simulation : a thesis presented in partial fulfilment of the requirements for the degree of Master in Technology in Engineering and Automation at Massey University
    (Massey University, 2004) Martin, Nicholas Kenneth Lamie
    PROGRAMME OVERVIEW The research described here, 'Design Testing Using Simulation,' is part of the larger programme 'Remote Process Performance Monitoring and Process Design Auditing'. The goal of this is to provide SchemNZ Ltd with the expertise and technological capability to remotely (internationally) monitor and diagnose the performance of processing and manufacturing plants. This will permit the client companies to schedule maintenance of equipment rather than react to unexpected equipment failures. In addition, it will allow the client companies to retain trained staff locally rather than attempt to duplicate skills in each international market. Project Description Specifically this project investigates the use of process simulation software to audit process designs before construction and in particular, before overseas shipping. By trialing the software on a case study the company will gain confidence in the ability of the software to highlight problems with process designs. Although the theoretical background for modelling and simulation has existed for some time, the application of these techniques is only becoming widely feasible with the advent of computers. Furthermore, the techniques are not yet as rigorous as those used in more traditional methods. A large part of this project therefore is concerned with building techniques and systems that will enable further modelling to proceed in a high-quality fashion. The results of the simulation while important, are not the driving factor in this project. Rather the creation of a logical framework that can be applied to additional projects and the validation of the model's usefulness are the primary goals for this research. This approach will lead to an integration of modelling techniques providing a system that allows useful simulations to be created quickly and easily.