Electrical machines without a steel magnetic core

摘要

Possible ways for constructing electrical machines without steel cores are discussed, in which superconductors and permanent magnets are used The machines of the SRM type without steel cores are analysed, whose active unipolar poles are made of permanent magnets or super-conducting modules and windings. The theory of these machines is developed, and it is shown that they can compete with other machines. A concept of a new type of synchronous electrical machines with unipolar poles and bipolar field without steel cores - is described These machines have a low weight due to a high pole overlap factor and the use of air poles with reverse field.