Electrical generator or motor structure – Dynamoelectric – Reciprocating
Patent
1992-06-19
1995-04-11
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Reciprocating
H01L 4112
Patent
active
054061539
ABSTRACT:
A shaker with a Terfenol-D rod actuator includes a mass coupled to both ends of the rod through a spring seat, a spring seat/adjuster and a spring washer. The actuator is mounted inside a cylindrical coil, which in turn is mounted inside a cylindrical permanent magnet, which in turn is mounted inside a cylindrical housing. An electrical drive system provides a predetermined excitation signal to the coil to cause the rod to vibrate under the influence of the magnetic field generated by the coil. One embodiment features a vibrating mass on one end of the rod. An implantable shaker includes a seal to leak-proof the shaker and a coating of Biomer.TM.. The implantable shaker can be implanted in an animal to test tissue response to certain vibrations. According to another embodiment, the Terfenol-D rod actuator is held in place on one end with a pre-stress adjusting screw, which is threaded into the end of the housing and fixed in place with a jam nut. In all embodiments, a spring base is seated on one end of the rod actuator and forms an annular coaxial air gap between it and a spring seat, so that the air gap remains constant when the rod actuator vibrates and the spring base moves coaxially with respect to the spring seat.
REFERENCES:
patent: 4749891 (1988-06-01), Sheng
patent: 5184037 (1993-02-01), Kobayashi et al.
ABB Seatech AS brochures entitled Low-Frequency Transducers Based on Terfenol. 4 pages. (undated).
Magespro S.A. brochure entitled Underwater Loudspeaker for Leisure, Sport and for Professionals. 1 page. (undated).
Sketch of Terfenold-D Vibrator Construction produced by Edge Technologies, Inc., Ames, Iowa, drawn on Jan. 19, 1994.
Verhoeven, J. D., Gibbons, E. D., and McMasters, O. D., "The Growth of Single Crystal Terfenol-D Crystals," Metals Transactions, vol. 18A, p. 223, 1987 month unknown.
Verhoeven, J. D., Gibbons, E. D., McMasters, O. D., and Ostenson, J. E., "Directional Solidification and Heat Treatment of Terfenol-D Magnetorestrictive Materials," Metals Transaction, vol. 21A, p. 2249, 1990 month unknown.
Jiles, D. C., "Development and Characterization of Terfenol-D for Use in Sensors and Actuators," New Materials and Their Applications, edited by D. Holland, Institute of Physics, London, p. 365, 1990 month unknown.
Hiller, M. W., Bryant, M. D., and Umegaki, J., "Attenuation and Transformation of Vibration Through Active Control of Magnetostrictive Terfenol," Journal of Sound and Vibration, vol. 134, No. 3, pp. 507-519, 1989 month unknown.
Miller, C. G., "High Force, High Strain, Wide Bandwidth Linear Actuators Using the Magnetostrictive Material Terfenol-D", Proceedings on the Conference on Recent Advances in Active Control of Sound and Vibration, Technomic Publishing Co., Inc., Lancaster, Pa., 1991 month unknown.
Harris, C. M., Shock and Vibration Handbook, third edition, pp. 25-1 to 25-26, McGraw-Hill, New York, N.Y., 1988 month unknown.
Butler, J. L., "Application Manual for the Design of Etrema Terfenol-D Magnetostrictive Transducers," Etrema Division, Edge Technologies, Inc., 1988 month unknown.
"Terfenol-D Notes", vol. 4, No. 1, p. 4, Edge Technologies, Jan. 1991.
"Magnetostrictive Actuators", Edge Technologies, Etrema Products Division date unknown.
Flatau Alison
Hall David
Iowa State University & Research Foundation, Inc.
Jones Judson H.
Stephan Steven L.
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