Magnetic machines and power electronics for power MEMS applications
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2005.
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| Format: | Thesis |
| Language: | eng |
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Massachusetts Institute of Technology
2006
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| Online Access: | http://hdl.handle.net/1721.1/34465 |
| _version_ | 1811084626858344448 |
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| author | Das, Sauparna, 1979- |
| author2 | Jeffrey H. Lang. |
| author_facet | Jeffrey H. Lang. Das, Sauparna, 1979- |
| author_sort | Das, Sauparna, 1979- |
| collection | MIT |
| description | Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2005. |
| first_indexed | 2024-09-23T12:54:32Z |
| format | Thesis |
| id | mit-1721.1/34465 |
| institution | Massachusetts Institute of Technology |
| language | eng |
| last_indexed | 2024-09-23T12:54:32Z |
| publishDate | 2006 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/344652019-04-12T09:21:49Z Magnetic machines and power electronics for power MEMS applications Das, Sauparna, 1979- Jeffrey H. Lang. Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science. Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science. Electrical Engineering and Computer Science. Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2005. Includes bibliographical references (p. 321-323). This thesis presents the modeling, design, and characterization of microfabricated, surface-wound, permanent-magnet (PM) generators, and their power electronics, for use in Watt-level Power MEMS applications such as a microscale gas turbine engine. The generators are three-phase, axial-flux, synchronous machines, comprising a rotor with an annular PM and ferromagnetic core, and a stator with multi-turn surface windings on a soft magnetic substrate. The fabrication of the PM generators, as well as the development of their high-speed spinning rotor test stand, was carried out by collaborators at the Georgia Institute of Technology. The machines are modeled by analytically solving 2D magneto-quasistatic Maxwell's Equations as a function of radius and then integrating the field solutions over the radial span of the machine to determine the open-circuit voltage, torque and losses in the stator core. The model provides a computationally fast method to determine power and efficiency of an axial-air-gap PM machine as a function of geometry, speed and material properties. Both passive and active power electronics have been built and tested. The passive power electronics consist of a three-phase transformer and diode bridge rectifier. (cont.) The active power electronics consist of a switch-mode rectifier based on the boost semi-bridge topology which is used to convert the unregulated AC generator voltages to a regulated 12 V DC without the need for rotor position/speed or stator terminal current/voltage sensing. At the rotational speed of 300,000 rpm, one generator converts 16.2 W of mechanical power to electrical power. Coupled to the transformer and diode bridge rectifier, it delivers 8 W DC to a resistive load. This is the highest output power ever delivered by a microscale electric generator to date. The corresponding power and current densities of 57.8 MW/m3 and 6x 108 A/m2, respectively, are much higher than those of a macroscale electric generator. At the rotational speed of 300,000 rpm, the generator and switch-mode rectifier delivered 5.5 W DC to a resistive load at a power density three times that of the passive electronics. This Watt-scale electrical power generation demonstrates the viability of scaled PM machines and power electronics for practical Power MEMS applications. by Sauparna Das. Ph.D. 2006-11-07T12:23:09Z 2006-11-07T12:23:09Z 2005 2005 Thesis http://hdl.handle.net/1721.1/34465 70716608 eng M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 323 p. 16921694 bytes 16936400 bytes application/pdf application/pdf application/pdf Massachusetts Institute of Technology |
| spellingShingle | Electrical Engineering and Computer Science. Das, Sauparna, 1979- Magnetic machines and power electronics for power MEMS applications |
| title | Magnetic machines and power electronics for power MEMS applications |
| title_full | Magnetic machines and power electronics for power MEMS applications |
| title_fullStr | Magnetic machines and power electronics for power MEMS applications |
| title_full_unstemmed | Magnetic machines and power electronics for power MEMS applications |
| title_short | Magnetic machines and power electronics for power MEMS applications |
| title_sort | magnetic machines and power electronics for power mems applications |
| topic | Electrical Engineering and Computer Science. |
| url | http://hdl.handle.net/1721.1/34465 |
| work_keys_str_mv | AT dassauparna1979 magneticmachinesandpowerelectronicsforpowermemsapplications |