DESIGN OF A PERMANENT MAGNET AIR-TURBO GENERATOR AND OSCILLATION STUDIES IN MINIATURE SYNCHRONOUS MOTORS
- BY TAN GUAN HONG A THESIS PRESENTED FOR THE DEGREE OF DOCTOR OF PHILOSOPHY IN THE DEPARTMENT OF ELECTRONIC AND ELECTRICAL ENGINEERING, ...
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- BY TAN GUAN HONG
A THESIS PRESENTED FOR THE DEGREE OF DOCTOR OF PHILOSOPHY IN THE DEPARTMENT OF ELECTRONIC AND ELECTRICAL ENGINEERING, THE UNIVERSITY OF SHEFFIELD
JANUARY, 1960
The investigation covered by this thesis was conducted in the Department of Electronic and Electrical Engineering, University of Sheffield.
The author wishes to thank Professor F. A. Benson for the laboratory, computing and workshop facilities, his supervisor Dr. T. S. Birch for his advice, -guidance and encouragement throughout the course of the investigation,
Dr. D. Howe for his interest in the work and in particular for allowing the author to use his finite element computer programs, and Dr. R. Brown for his assistance in the investigation.
Thanks are also due to all the technical and clerical staff, The Wolf Safety Lamp Company (Wm. Maurice) Limited, Sheffield, England for the award of a research studentship, and Messrs. J. Jackson and N. Bishop for their helpful advice.
Download (pdf): DESIGN OF A PERMANENT MAGNET AIR-TURBO GENERATOR AND OSCILLATION STUDIES IN MINIATURE SYNCHRONOUS MOTORS
The work described in this part of the thesis is involved mainly with uprating a 55W air-turbine driven permanent magnet generator to 250W. It is shown that the electrical performance of the generator can be predicted from a simple equivalent circuit comprising an, induced emf source with a series inductance and resistance. When matching the generator and turbine characteristics iron losses are included as an additional torque requirement.
Analysis has identified that the most important para-meters which determine the rating-of the generator are the stator flux.., linkage,. sstator inductance, and number, of pole,,, pairs.
Investigations have therefore centred around the calculation of these quantities. Previous design methods for calculating the parameters have been dependent on experimental data for particular magnet geometries. They are not sufficiently general to permit design calculations for magnets having radically different shapes or properties. Therefore the finite element method is used to predict the magnetic field distribution, from which the stator winding flux linkages and inductance, and the saliency torque, are predicted, an important parameter when matching the turbine and generator at starting. The finite element method offers significant advantages over analytical methods because it can account accurately for leakage flux, it can handle complex configurations of magnetic circuit and the directional properties of the magnet, and it allows different parts of the magnet to operate at different flux density levels.
The performance of the generator is predicted with reasonable accuracy. -Alternative rotors for the 250W generator have been designed and tested. Results have shown that the existing. generator can be adapted to the 250W design simply by using a rare-earth magnet rotor, and selecting a suitable stator winding turns factor for matching the generator and bulb. Two methods of matching the load characteristics of the turbine, generator and bulb, to produce an acceptable system have been developed.
A simple electronic protection circuit has been designed to prevent the 250W generator from overspeeding in the event of bulb failure. Additionally it can limit over-voltages, caused by variations in the pressure of the air supply, which would otherwise decrease the life of the bulb.
Learn more: Design and Simulation of Free Energy Permanent Magnet Motor (FEPMM)
A THESIS PRESENTED FOR THE DEGREE OF DOCTOR OF PHILOSOPHY IN THE DEPARTMENT OF ELECTRONIC AND ELECTRICAL ENGINEERING, THE UNIVERSITY OF SHEFFIELD
JANUARY, 1960
The investigation covered by this thesis was conducted in the Department of Electronic and Electrical Engineering, University of Sheffield.
The author wishes to thank Professor F. A. Benson for the laboratory, computing and workshop facilities, his supervisor Dr. T. S. Birch for his advice, -guidance and encouragement throughout the course of the investigation,
Dr. D. Howe for his interest in the work and in particular for allowing the author to use his finite element computer programs, and Dr. R. Brown for his assistance in the investigation.
Thanks are also due to all the technical and clerical staff, The Wolf Safety Lamp Company (Wm. Maurice) Limited, Sheffield, England for the award of a research studentship, and Messrs. J. Jackson and N. Bishop for their helpful advice.
Download (pdf): DESIGN OF A PERMANENT MAGNET AIR-TURBO GENERATOR AND OSCILLATION STUDIES IN MINIATURE SYNCHRONOUS MOTORS
The work described in this part of the thesis is involved mainly with uprating a 55W air-turbine driven permanent magnet generator to 250W. It is shown that the electrical performance of the generator can be predicted from a simple equivalent circuit comprising an, induced emf source with a series inductance and resistance. When matching the generator and turbine characteristics iron losses are included as an additional torque requirement.
Analysis has identified that the most important para-meters which determine the rating-of the generator are the stator flux.., linkage,. sstator inductance, and number, of pole,,, pairs.
Investigations have therefore centred around the calculation of these quantities. Previous design methods for calculating the parameters have been dependent on experimental data for particular magnet geometries. They are not sufficiently general to permit design calculations for magnets having radically different shapes or properties. Therefore the finite element method is used to predict the magnetic field distribution, from which the stator winding flux linkages and inductance, and the saliency torque, are predicted, an important parameter when matching the turbine and generator at starting. The finite element method offers significant advantages over analytical methods because it can account accurately for leakage flux, it can handle complex configurations of magnetic circuit and the directional properties of the magnet, and it allows different parts of the magnet to operate at different flux density levels.
The performance of the generator is predicted with reasonable accuracy. -Alternative rotors for the 250W generator have been designed and tested. Results have shown that the existing. generator can be adapted to the 250W design simply by using a rare-earth magnet rotor, and selecting a suitable stator winding turns factor for matching the generator and bulb. Two methods of matching the load characteristics of the turbine, generator and bulb, to produce an acceptable system have been developed.
A simple electronic protection circuit has been designed to prevent the 250W generator from overspeeding in the event of bulb failure. Additionally it can limit over-voltages, caused by variations in the pressure of the air supply, which would otherwise decrease the life of the bulb.
Learn more: Design and Simulation of Free Energy Permanent Magnet Motor (FEPMM)
Special Note: Posting of this document on Blog does not imply approval or disapproval by the Department of Energy. This work is made available to illustrate innovative energy research by multiple researchers involving new concepts. Scientific method requires replication and independent test and verification, and an additional research prototype build-up for those purposes is presently underway by the authors.
Revealed At Last: Ancient Invention Generates Energy-On-Demand
✔ Nikola Tesla’s method of magnifying electric power by neutralizing the magnetic counter-forces in an electric generator
✔ Currents are 180 out of phase with each other, Lenz's law naturally is broken
✔ Principle of Resonance to achieve Overunity
Revealed At Last: Ancient Invention Generates Energy-On-Demand
✔ Nikola Tesla’s method of magnifying electric power by neutralizing the magnetic counter-forces in an electric generator
Generates Energy-On-Demand: Easy Power Plan Will Change Our World Forever
✔ Currents are 180 out of phase with each other, Lenz's law naturally is broken
✔ Principle of Resonance to achieve Overunity
