Patent ID: 8415855
Filing Date: 2013-04-09
Classification: H02K

Abstract:
1. A brushless motor comprising: a rotor having four permanent magnet rotor poles; and a stator having six stator teeth and an n-phase stator winding with each leg of the stator winding having a single coil wound about a respective one of the stator teeth, where n is an integer greater than 2, wherein the stator teeth form wound teeth having a coil there on and unwound teeth having no coil, wherein the wound teeth are alternately spaced with the unwound teeth, and each wound tooth or each unwound tooth or each stator tooth, has at least one axially extending groove formed in a face thereof dividing each said tooth into a plurality of stator poles; wherein the stator has a core and the core has a radially outer surface having n recesses extending axially of the core, each recess aligned with a respective one of the unwound teeth in a radial direction of the motor, and the number of the stator poles formed on each wound tooth is two and the number of stator poles formed on each unwound tooth is one and the total number of stator poles is nine.