Browse Prior Art Database

High Performance Rotary Actuator Motor

IP.com Disclosure Number: IPCOM000049823D
Original Publication Date: 1982-Jul-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 2 page(s) / 57K

Publishing Venue

IBM

Related People

Hearn, AR: AUTHOR

Abstract

A rotary actuator is shown of the type employing a cylindrical shell rotor moving in a magnetic field extending across an annular air gap. Higher performance is achieved without torsional resonance penalties by employing a rotor having concentric double shell windings in which the shells move in respective concentric air gaps on opposite sides of permanent magnets providing the magnetic field.

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High Performance Rotary Actuator Motor

A rotary actuator is shown of the type employing a cylindrical shell rotor moving in a magnetic field extending across an annular air gap. Higher performance is achieved without torsional resonance penalties by employing a rotor having concentric double shell windings in which the shells move in respective concentric air gaps on opposite sides of permanent magnets providing the magnetic field.

As shown in the drawing, the actuator comprises a spindle 10 rotating about an axis 11. The spindle is mounted for rotation in an upper fixed bearing 12 and lower floating bearing 13. Helical spring 14 provides axial preload, and leaf spring 15 provides radial preload to the floating bearing. Torque is transmitted to an external driven member by means of a spindle extension plate 16 integral with the spindle.

The torque is produced by the application of current to a rotor which is an assembly of two concentric cylindrical shell windings 17 and 18 and a former 19 which is rigidly attached to spindle extension plate 16. These windings each consist of a plurality of thin loop coils arranged in a continuous cylindrical framework substantially as shown in European Patent Application Publication 31876.

Each pair of adjacent axially extending limbs of adjacent loop coils lies opposite to a pole face of a radially magnetized permanent magnet 20. This magnet together with a core 21, a collar 22 and a shroud 23, all made of magnetizable material...