2026-09-19T21:52:13Zhttps://dspace.mit.edu/server/oai/requestoai:dspace.mit.edu:1721.1/744292022-01-13T07:54:36Zcom_1721.1_7582com_1721.1_7581col_1721.1_131024
Ian W. Hunter.
Brown, Ashley (Ashley A.)
Massachusetts Institute of Technology. Dept. of Mechanical Engineering.
Massachusetts Institute of Technology. Department of Mechanical Engineering
2012-10-26T18:08:19Z
2012-10-26T18:08:19Z
2012
2012
http://hdl.handle.net/1721.1/74429
813047618
Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2012.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 45-46).
This thesis describes the development of a voice-coil motor that will allow viscous fluids to be delivered via a portable needle-free injection device. The chosen motor design features opposing magnets whose flux is channeled across the air gap by a center radial magnet, thus creating a higher flux density in the gap compared to a one-magnet design. An analytical model is developed which gives the force of the motor based on the material properties and geometry. An optimized geometry is modeled using finite element analysis, which predicts a motor constant of 11.02 N/[the square root of]W. The motor is fabricated and characterization reveals it to have a motor constant of 8.43 N/[the square root of]W. Althought the motor constant is less than expected, it is a large improvement over the current motor used in needle-free injection, which has a motor constant of 3.21 N/[the square root of]W.
by Ashley Brown.
S.B.
46 p.
eng
Massachusetts Institute of Technology
M.I.T. theses are protected by
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http://dspace.mit.edu/handle/1721.1/7582
Mechanical Engineering.
Modeling and characterization of a voice coil motor
Thesis
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Publication
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<Abstract>This thesis describes the development of a voice-coil motor that will allow viscous fluids to be delivered via a portable needle-free injection device. The chosen motor design features opposing magnets whose flux is channeled across the air gap by a center radial magnet, thus creating a higher flux density in the gap compared to a one-magnet design. An analytical model is developed which gives the force of the motor based on the material properties and geometry. An optimized geometry is modeled using finite element analysis, which predicts a motor constant of 11.02 N/[the square root of]W. The motor is fabricated and characterization reveals it to have a motor constant of 8.43 N/[the square root of]W. Althought the motor constant is less than expected, it is a large improvement over the current motor used in needle-free injection, which has a motor constant of 3.21 N/[the square root of]W.</Abstract>
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