Patent ID: 9231513
Filing Date: 2016-01-05
CPC Classification: H02P

Claim Text:
1. An electric motor system comprising: a rotor; a stator; said rotor and said stator being mounted for movement relative to one another; said rotor having multiple permanent magnet poles on an outer periphery of said rotor; said stator having multiple salient poles facing said permanent magnet poles; a first coil set and a second coil set; said first coil set having three phases, each of said phases comprising a first coil and a second coil connected in series and wrapped around different of said salient poles in different directions relative to said rotor; said second coil set having three phases, each of said phases comprising a first coil and a second coil connected in series and wrapped around different of said salient poles in different directions relative to said rotor; a driver configured to drive said first coil set with a first three-phase voltage and to drive said second coil set with a second three-phase voltage; said driver configured to drive said first phase of said first three-phase voltage and said first phase of said second three-phase voltage with a relative phase shift, and wherein at least two of said salient poles are adjacent and said adjacent salient poles have a relative magnetic flux phase shift approximately equal to said relative phase shift plus 180 degrees.