Electronic equipment such as digital cameras and mobile phones are getting popular, and they require a miniaturized motor with high performance for actuating optic devices. The PM type stepping motor is the preferred solution for determination of many small electronics position devices[1],[2]. They are suited for electronic equipment as they control the position and speed of the optic device simultaneously, because they are controlled by an input pulse without any feedback loop. However, it is very difficult to design the stepping motor with high torque and small size because it has complex mechanical structure and hardship of multi-magnetization of small sized PM. This paper proposes a novel structured PM type stepping motor with claw-poles and analyze the magnetic characteristics using 3-D FEA taking into account the magnetization distribution of PM in magnetizing yoke. From the simulation and experimental results, we show that the proposed model has a good structure for the miniaturization. In addition, we design and manufacture a novel structured PM type stepping motor of a 4.0mm-O.D. with same sized PM of general type 6.0mm-O.D. model. From the experimental results, we confirmed that proposed model is suitable for the miniaturization.
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