Patent ID: 6351053
Filing Date: 2002-02-26
Classification: H02K

Abstract:
A motor, comprising:at least two stator poles projecting at equal, or substantially equal, intervals from an inner circumference of a substantially cylindrical stator; stator coils wound around each of the stator poles, the stator coils capable of conducting current having at least two phases; at least two rotor poles projecting at equal or substantially equal, intervals from an outer circumference of a rotor, the rotor being influenced by magnetic flux generated by conducting current through the stator coils, the cross section of the rotor and rotor poles being uniform or substantially uniform along the length in an axial direction, wherein the stator poles have a first spread angle in relation to the center of the rotor and the rotor poles have a second spread angle in relation to the center of the rotor, the first spread angle is approximately equal to 2&pgr;/(mÂ·Nr) and the second spread angle is the range of about (2&pgr;/(mÂ·Nr)+&pgr;/Nr)/2&lE;&thgr;&lE;(&pgr;Nr), wherein m is the number of current phases and Nr is the number of rotor poles; and the rotor is rotated by driving each of the stator coils with sinusoidal, or substantially sinusoidal, waveforms.