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Title: System Dynamics and Control System for a High Bandwidth Rotary Actuator and Fast Tool Servo

Abstract

This paper explores some of the system dynamics and control issues for a short-stroke rotary actuator that we designed and tested for a new fast tool servo referred to as the 10 kHz rotary fast tool servo. The use of a fast tool servo (FTS) with a diamond turning machine for producing non-axisymmetric or textured surfaces on a workpiece is well known. In a previous paper [1] the authors provide details on the mechanical design and trade-off issues that were considered during the design phase for the fast tool servo. At the heart of that machine is the normal-stress variable reluctance rotary actuator described in more detail in this paper. In addition to producing the torque that is needed for the 10 kHz rotary fast tool servo, the actuator produces a force and is therefore referred to as a hybrid rotary/linear actuator. The actuator uses bias and steering magnetic fluxes for linearizing the torque versus current relationship. Certain types of electric engraving heads use an actuator similar in principle to our hybrid actuator. In the case of the engraving heads, the actuator is used to produce and sustain a resonating mechanical oscillator. This is in sharp contrast to the arbitrarymore » trajectory point-to-point closed-loop control of the tool tip that we demonstrate with our actuator and the 10 kHz FTS. Furthermore, we demonstrate closed-loop control of both the rotary and linear degrees of freedom for our actuator. We provide a brief summary of the demonstrated performance of the 10 kHz rotary fast tool servo, and discuss the magnetic circuit for the actuator and some of the related control issues. Montesanti [2] provides a more detailed and thorough discussion on the 10 kHz rotary fast tool servo, the hybrid actuator, and the pertinent prior art.« less

Authors:
;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
881898
Report Number(s):
UCRL-CONF-214383
TRN: US200613%%186
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: Presented at: American Society for Precision Engineering 2005 Annual Meeting, Norfolk, VA, United States, Oct 09 - Oct 14, 2005
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; ACCURACY; ACTUATORS; CLOSED-LOOP CONTROL; CONTROL SYSTEMS; DEGREES OF FREEDOM; DESIGN; DIAMONDS; MAGNETIC CIRCUITS; PERFORMANCE; TORQUE

Citation Formats

Montesanti, R C, and Trumper, D L. System Dynamics and Control System for a High Bandwidth Rotary Actuator and Fast Tool Servo. United States: N. p., 2005. Web.
Montesanti, R C, & Trumper, D L. System Dynamics and Control System for a High Bandwidth Rotary Actuator and Fast Tool Servo. United States.
Montesanti, R C, and Trumper, D L. Fri . "System Dynamics and Control System for a High Bandwidth Rotary Actuator and Fast Tool Servo". United States. https://www.osti.gov/servlets/purl/881898.
@article{osti_881898,
title = {System Dynamics and Control System for a High Bandwidth Rotary Actuator and Fast Tool Servo},
author = {Montesanti, R C and Trumper, D L},
abstractNote = {This paper explores some of the system dynamics and control issues for a short-stroke rotary actuator that we designed and tested for a new fast tool servo referred to as the 10 kHz rotary fast tool servo. The use of a fast tool servo (FTS) with a diamond turning machine for producing non-axisymmetric or textured surfaces on a workpiece is well known. In a previous paper [1] the authors provide details on the mechanical design and trade-off issues that were considered during the design phase for the fast tool servo. At the heart of that machine is the normal-stress variable reluctance rotary actuator described in more detail in this paper. In addition to producing the torque that is needed for the 10 kHz rotary fast tool servo, the actuator produces a force and is therefore referred to as a hybrid rotary/linear actuator. The actuator uses bias and steering magnetic fluxes for linearizing the torque versus current relationship. Certain types of electric engraving heads use an actuator similar in principle to our hybrid actuator. In the case of the engraving heads, the actuator is used to produce and sustain a resonating mechanical oscillator. This is in sharp contrast to the arbitrary trajectory point-to-point closed-loop control of the tool tip that we demonstrate with our actuator and the 10 kHz FTS. Furthermore, we demonstrate closed-loop control of both the rotary and linear degrees of freedom for our actuator. We provide a brief summary of the demonstrated performance of the 10 kHz rotary fast tool servo, and discuss the magnetic circuit for the actuator and some of the related control issues. Montesanti [2] provides a more detailed and thorough discussion on the 10 kHz rotary fast tool servo, the hybrid actuator, and the pertinent prior art.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2005},
month = {8}
}

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