Browse Prior Art Database

High Frequency Stepper Motor

IP.com Disclosure Number: IPCOM000079931D
Original Publication Date: 1973-Sep-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 85K

Publishing Venue

IBM

Related People

Abraham, DG: AUTHOR [+2]

Abstract

This high-frequency stepper motor includes a number of stators with windings wound about a support shaft between the stators, and a nonmagnetic rotor with a number of magnetic inserts spaced around the periphery of the rotor at positions, determined by the number of phases for a multiphase motor.

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High Frequency Stepper Motor

This high-frequency stepper motor includes a number of stators with windings wound about a support shaft between the stators, and a nonmagnetic rotor with a number of magnetic inserts spaced around the periphery of the rotor at positions, determined by the number of phases for a multiphase motor.

Referring to the figure, fixed shaft 2 supports laminated stators 3a, 3b, 3c and 3d for a three-phase stepper motor. Windings 4a, 4b and 4c for each of the three phases, respectively, are toroidally would between the laminated stators. Each of the stators 3a, 3b, 3c and 3d have teeth P1, P2, P3, P4, P5, P6, P7 and P8.

External nonmagnetic rotor 5 carries magnetic insers 6a, 6b, 6c plus three additional groups of magnetic inserts, for which only 8a and 9a are shown. Each magnetic insert overlaps a pair of stators, such as 3a and 3b for insert 6a, or 3b and 3c for insert 6b, or 3c and 3d for insert 6c.

Although all P1 are aligned for the various stators 3, a, b, c and d, other embodiments might have the teeth of the various stator elements staggered, to intercept rotating magnetic inserts 6a, 6b, 6c, etc., at different points of the rotation of external nonmagnetic rotor 5. External rotor 5 may be constructed of a light weight nonmagnetic material such as aluminum.

At the instance of rotation shown in the figure, magnetic insert 6a is aligned with stator pole P1 of stator 3a, a magnetic insert not shown in the figure, is aligned with pole P3 of...