Patent ID: 7432625

Claim:
An armature for use in a motor, comprising: a plurality of teeth; a plurality of slots formed between the adjacent teeth; and coils of three kinds of phases wound around the teeth, wherein the armature has a coil structure according to which radial force acting on a specific tooth is greater than radial force acting on another tooth, wherein the coil structure mixedly includes the slots in which coils of a single kind of phase are laid and the slots in which coils of a different kind of phase are laid, wherein the specific tooth is adjacent to two slots in which coils of a single kind of phase are laid, and wherein a peak value of the radial force acting on the specific tooth is made uniform with peak values of the radial forces acting on the other teeth of said armature besides said specific tooth by making a flux path in and/or adjacent to the specific tooth narrower than flux paths in and/or adjacent to said other teeth.