Electrical machine with circumferentially skewed rotor poles or stator coils

摘要

A rotor for an electrical machine including a plurality of pole sections with adjacent poles within each of the pole sections being distanced by a first uniform pole pitch. Adjacent poles belonging to different pole sections are distanced by a second (smaller) pole pitch at one end of each pole section, and by a third (larger) pole pitch at the other end of each pole section. Alternatively, a corresponding adjustment of coil pitches can be done in a stator of an electrical machine.

主权项

1. A stator for an electrical machine, the stator comprising
ncs coil sections of equal size that divide the stator evenly, ncs being an even number of at least four, each coil section comprising nc conductors, nc being an integer greater than one and the number of conductors in each coil section being the same, adjacent conductors within each of the coil sections being distanced by a first coil pitch with a value β1, the value β1being equal for all adjacent conductors within the same coil section, adjacent conductors belonging to different coil sections being distanced by a second coil pitch with a value β2at one end of each coil section, and by a third coil pitch with a value β3at an opposite end of each coil section, the values β1, β2and β3 being different from each other, wherein the value β2is smaller than the value β1, and the value β3is greater than the value β1; wherein the stator is physically divided into a plurality of discrete segments along interfaces between the adjacent conductors belonging to different coil sections such that no conductor crosses the interfaces between the discrete segments.