Effect of rotor slip on the gear ratio of harmonic side-drive micromotors

Stephen Phillips, Mehran Mehregany

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

This paper presents a preliminary model of the gear ratio of center-pin bearing harmonic (or wobble) side-drive micromotors, accounting for finite friction in the bearing and at the bushing contacts. The gear ratio of a wobble micromotor is affected by rotor slip, which is a function of motive torque, excitation angle, and friction torque. 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 ideal or nominal gear ratio and is equal to the bearing radius divided by the bearing clearance. The rotor-slip term is shown to be directly proportional to the bushing friction torque and inversely proportional to the square of the excitation voltage. The derived model is used to study the operation of wobble micromotors in nitrogen through gear-ratio measurements. The model fit of the experimental results is within 10%.

Original languageEnglish (US)
Pages (from-to)249-254
Number of pages6
JournalSensors and Actuators: A. Physical
Volume36
Issue number3
DOIs
StatePublished - 1993
Externally publishedYes

Fingerprint

micromotors
Micromotors
Bearings (structural)
rotors
Gears
slip
Rotors
harmonics
bushings
torque
Bushings
friction
Torque
Friction
clearances
excitation
Nitrogen
nitrogen
radii
Electric potential

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Mechanical Engineering
  • Instrumentation

Cite this

Effect of rotor slip on the gear ratio of harmonic side-drive micromotors. / Phillips, Stephen; Mehregany, Mehran.

In: Sensors and Actuators: A. Physical, Vol. 36, No. 3, 1993, p. 249-254.

Research output: Contribution to journalArticle

@article{73a7462e3bf74745bc31244d024b5b6f,
title = "Effect of rotor slip on the gear ratio of harmonic side-drive micromotors",
abstract = "This paper presents a preliminary model of the gear ratio of center-pin bearing harmonic (or wobble) side-drive micromotors, accounting for finite friction in the bearing and at the bushing contacts. The gear ratio of a wobble micromotor is affected by rotor slip, which is a function of motive torque, excitation angle, and friction torque. 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 ideal or nominal gear ratio and is equal to the bearing radius divided by the bearing clearance. The rotor-slip term is shown to be directly proportional to the bushing friction torque and inversely proportional to the square of the excitation voltage. The derived model is used to study the operation of wobble micromotors in nitrogen through gear-ratio measurements. The model fit of the experimental results is within 10{\%}.",
author = "Stephen Phillips and Mehran Mehregany",
year = "1993",
doi = "10.1016/0924-4247(93)80200-Z",
language = "English (US)",
volume = "36",
pages = "249--254",
journal = "Sensors and Actuators, A: Physical",
issn = "0924-4247",
publisher = "Elsevier",
number = "3",

}

TY - JOUR

T1 - Effect of rotor slip on the gear ratio of harmonic side-drive micromotors

AU - Phillips, Stephen

AU - Mehregany, Mehran

PY - 1993

Y1 - 1993

N2 - This paper presents a preliminary model of the gear ratio of center-pin bearing harmonic (or wobble) side-drive micromotors, accounting for finite friction in the bearing and at the bushing contacts. The gear ratio of a wobble micromotor is affected by rotor slip, which is a function of motive torque, excitation angle, and friction torque. 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 ideal or nominal gear ratio and is equal to the bearing radius divided by the bearing clearance. The rotor-slip term is shown to be directly proportional to the bushing friction torque and inversely proportional to the square of the excitation voltage. The derived model is used to study the operation of wobble micromotors in nitrogen through gear-ratio measurements. The model fit of the experimental results is within 10%.

AB - This paper presents a preliminary model of the gear ratio of center-pin bearing harmonic (or wobble) side-drive micromotors, accounting for finite friction in the bearing and at the bushing contacts. The gear ratio of a wobble micromotor is affected by rotor slip, which is a function of motive torque, excitation angle, and friction torque. 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 ideal or nominal gear ratio and is equal to the bearing radius divided by the bearing clearance. The rotor-slip term is shown to be directly proportional to the bushing friction torque and inversely proportional to the square of the excitation voltage. The derived model is used to study the operation of wobble micromotors in nitrogen through gear-ratio measurements. The model fit of the experimental results is within 10%.

UR - http://www.scopus.com/inward/record.url?scp=0027592219&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0027592219&partnerID=8YFLogxK

U2 - 10.1016/0924-4247(93)80200-Z

DO - 10.1016/0924-4247(93)80200-Z

M3 - Article

AN - SCOPUS:0027592219

VL - 36

SP - 249

EP - 254

JO - Sensors and Actuators, A: Physical

JF - Sensors and Actuators, A: Physical

SN - 0924-4247

IS - 3

ER -