A driving apparatus includes a magnet that is magnetized to at least two
poles in a circumferential direction and fixed to a rotor axis formed
with a soft magnetic material, and first and second coils arranged in the
same direction as the magnet with respect to the magnet-axis direction
and arranged adjacent to an end surface of the magnet in the magnet-axis
direction. The first magnetic pole portion is excited by energizing the
first coil, and the second magnetic pole portion is excited to a pole
opposite to the first magnetic pole portion by energizing the second
coil. A yoke portion is formed with a soft magnetic material for
supporting the first and second magnetic pole portions. The first
magnetic pole portion includes a first coil insertion portion that is
inserted to an internal diameter portion of the first coil, and a first
magnet facing portion that is arranged to face a magnetized outer
circumferential portion of the magnet with a predetermined gap at a
predetermined angle. The second magnetic pole portion includes a second
coil insertion portion that is inserted to an internal diameter portion
of the second coil, and a second magnet facing portion that is arranged
to face a magnetized outer circumferential portion of the magnet with a
predetermined gap at a predetermined angle.