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Cage rotor heating at stallWalker, John David January 1991 (has links)
No description available.
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Machine analysis : being a study of the application of the finite element method for solving the two-dimensional field of the single-phase shaded-pole induction motorNajjar, Mohamad January 1985 (has links)
This thesis contains eight chapters, dealing with machine analysis and representation. A definition and a brief survey of previous investigation devoted to shaded-pole motors and the application of finite element method for solving the two-dimensional electromagnetic field is given in Chapter 1. An outline of the present investigation is also given. In Chapter 2, the experimental requirements and details of the equipment are given. This includes the techniques of recording the transient torque patterns and the method of measuring the complete torque-speed characteristics. The experimental methods for parameters determination are also mentioned. The finite element method is outlined in Chapter 3. This chapter deals also with the assumptions made, the formulation of the non-linear energy function, the solution of Poisson's equation and an example of a simple shape contianing 16 elements for illustrating the method. In Chapter 4, the computer program for the finite element is outlined. The iteration process and the numerical representation of the magnetization curve are mentioned. Application of the finite element method to the shaded-pole motor is also given. Calculation of parameters by finite element technique is given in Chapter 5. Self inductance is calculated using the concept of stored energy and the results of self and mutual inductances are tabulated. Basic performance equations of an electrical machine are derived in Chapter 6. Solution of the basic performance equations, by a step-by-step numerical method, is also given. In Chapter 7, the steady state performance equations are established in terms of harmonic currents and inductance coefficients. The flux linkages are evaluated by the approximated functions of mutual inductances. The electromagnetic torque is calculated from the stored energy in the magentic field. General conclusions and suggestion for further work are mentioned in Chapter 8.
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Rapid simulation of induction motors using a microprocessor systemTait, Andrew James January 1984 (has links)
The work, of which this thesis is a record, is concerned with the development of a microprocessor based system to simulate, at a speed approaching real time, the steady state and transient response of induction motor drives under various conditions. This development proceeds by outlining the basic theory involved in the simulation of induction motors. This is followed by an analysis of the various integration methods available for the solution of ordinary differential equations. This analysis being primarily concerned with determining the most efficient means of solving the set of equations used to describe induction motor response. The third part of this work explains the development of a distributed processing system that was used to achieve the simulation. This part of the work starts by describing the procedures that were followed in the development of a single processor-co-processor system and continues to detail the extension from one microprocessor to four in order to increase the speed of solution.
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Induction machines with unlaminated rotorsSambath, H. P. January 1976 (has links)
No description available.
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Modelling of inverter-fed induction machineAhmed, M. M. January 1985 (has links)
No description available.
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On-line control of microprocessor-based PWM for A.C. drivesBezanov, Goran January 1991 (has links)
No description available.
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AC voltage adjustment and controlled compensation of electrical power drivesOdiete, G. C. E. January 1986 (has links)
No description available.
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Speed control of wound-rotor induction motor using thyristors to control rotor external resistanceSmiai, Mohamed Salah January 1989 (has links)
No description available.
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Real time emulation environment for digital control developmentSlater, Howard James January 1997 (has links)
Simulation is a powerful tool for developing electric drive systems. Simulations allow the designer to experiment with control algorithms and hardware systems in a safe environment. To this end simulation is becoming increasingly popular. On'-line simulation does have its limitations in that the controller developed during the simulation period has eventually to be transferred to the target processor which will operate in the actual drive system. If, however, a real-time simulation environment could be realised, then the actual controller running in the actual target processor could be included in the simulation. Therefore no translation of code would be required once the controller had been developed and tested within the simulation. This would obviously lead to a reduction in development time and eliminate any possibility of introducing errors due to the translation between the simulated and actual controllers. This thesis describes the development of such a system using a multiple digital signal processing environment. The real-time simulated drive is operated in parallel with an experimental drive to allow a direct comparison between the two. The ability of the multiple processing system to operate in real-time has allowed the whole concept of simulation to be taken a stage further by the development of a real-time power level simulator. This simulator is capable of emulating a machine and load in real-time with real level of voltage and current. It is designed to replace a real machine during the development and testing stages of drive manufacture. This Virtual Machine is a controllable source/sink which is driven by the real-time simulation, and because of this the Virtual Machine takes on the characteristics of any choice of model within the real-time simulation. Moreover, because of its ability to handle bi-directional power flow, the Virtual machine can be programmed to emulate motors or generators. The Virtual Machine also includes the emulation of loads, thus making it extremely flexible and of interest to applications such as machine tools, electric vehicles, and wind generators, to name but a few.
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Induction motor operation with series capacitanceDeib, Deib Ali January 1986 (has links)
No description available.
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