Permanent magnet machines with powdered iron cores and pre-pressed windings

Jack, AG; Mecrow, BC; Dickinson, PG; Stephenson, D; Burdess, JS; Fawcett, JN; Evans, T

doi:10.1109/IAS.1999.799934

Permanent magnet machines with powdered iron cores and pre-pressed windings

Lookup NU author(s): Professor Alan Jack, Professor Barrie Mecrow, Phillip Dickinson, Dawn Stephenson, Emeritus Professor James Burdess, Professor Neville Fawcett

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Abstract

This paper presents a permanent magnet servo motor, built with a powdered iron stator, which has been designed to take full advantage of the properties of the material. There are a number of important design features which are not possible with laminated cores. For example, the core back is axially extended over the end windings, the armature core components are sub-divided and pre-formed stator coils are used. The coils are pre-pressed to form a solid component with an exceptionally high fill factor (78%). The prototype offers far superior performance to a conventionally laminated commercial machine, manufactured in the same frame.