Operation of harmonic side-drive micromotors studied through gear ratio measurements

M. Mehregany, S. M. Phillips, E. T. Hsu, J. H. Lang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

18 Scopus citations

Abstract

The detailed operation of variable capacitance harmonic (or wobble) side-drive micromotors was studied through gear ratio measurements. The gear ratio of the wobble micromotor is affected by wear in the bearing and by rotor slip. Rotor slip is a function of motive torque magnitude, excitation angle, and friction torques. The gear ratio of a wobble micromotor can be expressed as a constant term plus a term that accounts for rotor slip. The constant term is the nominal gear ratio which is equal to the bearing radius divided by the bearing clearance. The rotor slip term is directly proportional to the bushing friction torque and inversely proportional to the square of the excitation voltage. Micromotor operation in air as opposed to nitrogen demonstrates a significantly larger bushing friction torque.

Original languageEnglish (US)
Title of host publicationTransducers '91
PublisherPubl by IEEE
Pages59-62
Number of pages4
ISBN (Print)0879425857
StatePublished - Dec 1 1991
Externally publishedYes
Event1991 International Conference on Solid-State Sensors and Actuators - San Francisco, CA, USA
Duration: Jun 24 1991Jun 28 1991

Publication series

NameTransducers '91

Other

Other1991 International Conference on Solid-State Sensors and Actuators
CitySan Francisco, CA, USA
Period6/24/916/28/91

ASJC Scopus subject areas

  • Engineering(all)

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