Title :
A comparative study of bearing designs and operational environments for harmonic side-drive micromotors
Author :
Dhuler, Vijayakumar R. ; Mehregany, Mehran ; Phillips, Stephen M.
Author_Institution :
Dept. of Electr. Eng. & Appl. Phys., Case Western Reserve Univ., Cleveland, OH, USA
fDate :
11/1/1993 12:00:00 AM
Abstract :
The development of flange bearing harmonic side-drive (wobble) micromotors and the results from a comparative study of the operation of flange and center-pin bearing micromotors in different gaseous environments are discussed. The flange and center-pin wobble polysilicon micromotors have been operated with excitations as low as 30 V across 1.5-μm rotor/stator gaps. Since the flange in the flange bearing design is located at a smaller radius than the bushing in the center-pin bearing design, changes in the frictional parameters of the flange/bushing contact affect the performance of flange bearing micromotors less than that of center-pin bearing micromotors. As a result, flange bearing wobble micromotors show superior performance in gaseous environments over their center-pin counterparts. They can be operated in room air for longer periods and are not significantly affected by the operating environment or by extended storage between operations. The coefficient of friction for polysilicon is observed to change with the operational environment
Keywords :
bushings; environmental testing; friction; machine bearings; machine testing; micromechanical devices; small electric machines; Si; bearing designs; center-pin bearing micromotors; coefficient of friction; flange bearing micromotors; flange/bushing contact; frictional parameters; gaseous environments; gear ratio; harmonic side-drive micromotors; operational environments; rotor/stator gaps; wobble polysilicon micromotors; Argon; Fabrication; Flanges; Friction; Gears; Insulators; Micromotors; Nitrogen; Stators; Torque;
Journal_Title :
Electron Devices, IEEE Transactions on
