Accession Number : ADA290273

Title :   Design of a Fast-Tool Servo System Using Magnetic Servo Levitation.

Descriptive Note : Progress rept.,

Corporate Author : NORTH CAROLINA STATE UNIV AT RALEIGH PRECISION ENGINEERING CENTER

Personal Author(s) : Ro, Paul I.

PDF Url : ADA290273

Report Date : 15 JAN 1995

Pagination or Media Count : 33

Abstract : Magnetic Servo Levitation is proposed as a method to drive a Fast Tool Servo System, in order to compensate for errors resulting from mechanical misalignment, slide vibration, tool wear, and cutting dynamics on a Diamond Turning Machine. Theoretical magnetic equations have provided a basis for electromagnet design. Further analyses have used finite element models to find trends in magnetic properties, as well as assisting in structural design. A T-shaped, state-of-the-art composite structure has been proposed to transfer the electromagnet armature motion to the cutting tool. Flexural bearings are used to guide the T-structure as well as assist motion with their restoring force. Design of these are critical for the success of the servo. A static test fixture has been designed to investigate static forces as a function of coil current and separation gap of the electromagnet and armature. Results show very good correlation with theoretical values. A dynamic test fixture has been designed as well to determine limits in bandwidth, range, and positioning accuracy. Dynamics of the proposed system is discussed, along with simulation issues. Preliminary experimental data from the dynamic fixture is also presented. (AN)

Descriptors :   *SERVOMECHANISMS, *ERROR CORRECTION CODES, *CUTTING TOOLS, MATHEMATICAL MODELS, COMPUTERIZED SIMULATION, DATA PROCESSING, COILS, MAGNETIC FIELDS, VIBRATION, EXPERIMENTAL DATA, ARMATURES, FINITE ELEMENT ANALYSIS, STATIC LOADS, MOTION, ACCURACY, COMPOSITE STRUCTURES, WEAR, BEARINGS, PERMEABILITY(MAGNETIC), MISALIGNMENT, FLEXURAL PROPERTIES, STATIC TESTS, ELECTROMAGNETS, DYNAMIC TESTS, DIAMOND WHEELS.

Subject Categories : Electrical and Electronic Equipment
      Machinery and Tools
      Computer Programming and Software
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE