Patent ID: 7250698

Claim:
A two-phase claw-pole type rotary machine comprising: first and second rotary machine elements each for single phase arranged coaxially with each other, each of the rotary machine elements having a magnet rotor magnetized in a circumferential direction thereof so as to form a N pole and a S pole, a claw-pole type stator arranged concentrically with the magnet rotor with an air gap therebetween, and an annular stator winding, wherein claw poles of the stator are divided into a plurality of blocks and are circumferentially separated from one another, wherein a distance between adjacent claw poles of the same polarity in each block is set to a value (β 0 −Δβ), substantially, where β 0 is a reference pitch when the claw poles of the same polarity are arranged equidistantly apart from one another in a range of 360°, Δβ is π/2q, and q is a number of claw poles of the same polarity in each block, and wherein the first and second rotary machine elements are circumferentially shifted from each other by 90° (electric angle).