Patent ID: 6172440
Filing Date: 2001-01-09
Classification: H02K

Abstract:
A motor comprising:a magnet which is cylindrically formed, having a first polarized layer, 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, and a second polarized layer, 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, the advance phase angle being set to .theta.1 with respect to the first polarized layer;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 outer 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;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 first and second polarized layers and said first and second stators are positioned so that .theta.1+.theta.2 are larger than 180/n degrees, wherein the phase lag angle of said second stator with respect to said first stator is .theta.2.