Patent ID: 6411003
Filing Date: 2002-06-25
Classification: H02K

Abstract:
A motor comprising:a magnet which is cylindrically formed, in which at least the outer peripheral surface is circumferentially divided into n parts so that the n parts are alternately polarized to different poles, wherein n is a positive integer; first and second coils axially provided with respect to said magnet, said first and second coils being positioned coaxial with said magnet; a first outer magnetic pole excited by said first coil, said first outer magnetic pole facing the outer peripheral surface on one end side of said magnet; a first inner magnetic pole excited by said first coil, said first inner magnetic pole facing the inner peripheral surface on the one end side of said magnet, said first inner magnetic pole forming a first stator together with said first outer magnetic pole; a second outer magnetic pole excited by said second coil, said second outer magnetic pole facing the outer peripheral surface on the other end side of said magnet; and a second inner magnetic pole excited by said second coil, said second inner magnetic pole facing the inner peripheral surface on the other end side of said magnet, said second inner magnetic pole forming a second stator together with said second outer magnetic pole, said second stator being shifted by the phase angle of 180/n+&Dgr;&thgr; degrees with respect to said first stator, wherein &Dgr;&thgr; is set to a range of 8/n degrees to 40/n degrees.