Patent ID: 8680740

Claim:
A stator for an electrical machine, the stator comprising a plurality of stator teeth, the stator teeth being separated from one another by stator slots, each stator tooth being surrounded by a concentrated armature coil, the armature coils representing two or more different electrical phases, the stator teeth being distributed in a non-uniform pattern along a circumference of the stator, the non-uniform pattern comprising at least one short tooth span and at least one long tooth span, the short tooth span having a smaller dimension than the long tooth span, wherein none of the stator slots between two stator teeth distanced by a short tooth span is configured to carry magnetic flux while each of the stator slots between two stator teeth distanced by a long tooth span comprises an intermediate tooth for carrying a magnetic flux, wherein there is a long tooth span between each pair of adjacent stator teeth with coils in different electrical phases, characterized in that the electrical machine further comprises a rotor having a plurality of poles, each pole comprising a permanent magnet, the short tooth span being equal to a pole span, and the number of poles being different from ten and/or the number of stator teeth being different from nine.