Study on a novel doubly salient permanent-magnet machine with the doubly-fed stator

Abstract

A doubly salient permanent-magnet machine with a doubly fed stator is studied. In this machine, not only the doubly-fed stator, which means there are armature winding and field winding placed in the stator, is adopted, but also an additional paralleled magnetic sub-path aside from the permanent-magnetic bodies is put forward. By the suitable design of the reluctance of the paralleled magnetic sub-path, a large adjustable flux range can be achieved easily with small field MMFs. The special structure of the prototype is introduced; the relationship among the adjustable flux range, the field MMFs and reluctance of the paralleled magnetic sub-path is analyzed; and the magnetic field is calculated by finite element method. Experimental results coincide with the design. There are many advantages of the design, such as novel structure, simple field control, notable adjustable flux range, and small field loss.