Patent ID: 7479722
Filing Date: 2009-01-20
Classification: H02K,H02P

Abstract:
1. A relative drive device for driving a first driving force transmission member and a second driving force transmission member relative to each other, the relative drive device comprising: first and second coil groups connected to the first driving force transmission member; and a magnet group connected to the second driving force transmission member, wherein the first and second coil groups each includes a plurality of electrically interconnected coils disposed along a predetermined direction at a predetermined pitch, the magnet group includes a plurality of magnets disposed with alternating north and south poles facing the first and second coil groups, and the first and second coil groups are disposed at positions that are out of phase with each other by an odd multiple of π/2 in electrical angles, the first driving force transmission member is connected to a prime mover by a drive shaft, the second driving force transmission member is connected to a load by a load shaft, the relative drive device is operable in any one of a plurality of operation modes including;