| 摘要 |
A small, lightweight relative drive device is provided, which is capable of producing large torque. The relative drive device of a two-phase magnetic excitation type according to an aspect of the invention comprises first and second coil groups and a magnet group. The magnet group includes magnets disposed with alternating north and south poles facing the first and second coil groups. The first and second coil groups are disposed at positions that are out of phase with each other by an odd multiple of pi/2 in electrical angles. The coils in the first and second coil groups have substantially no magnetic material cores, and the relative drive device has substantially no magnetic material yoke for forming a magnetic circuit.
|
