Browse Prior Art Database

Permanent Magnet DC Motor

IP.com Disclosure Number: IPCOM000091382D
Original Publication Date: 1968-Jan-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 68K

Publishing Venue

IBM

Related People

Fisher, GA: AUTHOR [+2]

Abstract

High air gap flux density for DC motor operation is obtained with this field magnet assembly.

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Permanent Magnet DC Motor

High air gap flux density for DC motor operation is obtained with this field magnet assembly.

The motor assembly includes four permanent magnets A that are oriented to carry flux across their width as shown by the north-pointing arrows. Magnets A are joined by soft iron pole pieces B to form a square structure with magnets A diagonally positioned at the corners. High permeability pole tips C are fixed to the inner faces of four pole pieces B. Armature D and soft iron flux return core E are positioned within the field structure. To obtain a high torque/inertia ratio, armature D is iron free and return element E is stationarily mounted.

Extremely high air gap flux is obtained with this structure. Each magnet A contributes flux to two poles. The shape of pole pieces B extending from the diagonal magnets has the effect of focusing flux toward the pole tips C and prevents leakage flux. The high permeability pole tips C also prevent leakage due to their high saturation level.

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