摘要:
A yoke assembly (5) is constructed by retaining integrally a yoke ring (50) having positioning holes (54, 54) aligned with pole claws (51, 51 ...) arranged equally on the inner circumference and a yoke ring (50) having positioning holes (55, 55) aligned with the space between pole claws (51, 51...) arranged equally on the inner circumference by a retaining cylinder (52) made of a resin. The retaining cylinder (52) has a pin hole (56) remaining after pulling out a common positioning pin inserted into the positioning holes (54, 55) during molding.