小型モータの開発動向

概要

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The estimated production number of small motors has exceeded 5.4 billion in 2006. Furthermore, the annual growth-rate of approximately 5 % or more can be expected on average in the future. Therefore, the wide utilization of highly-efficient small motors is strongly required from the viewpoint of the environment protection. By the way, the usage of high-performance magnets with superior magnetic properties as well as the optimized magnetic circuit is one of the key technologies in the development of small motors for further miniaturization and efficiency. Up to the present, bonded and sintered rare earth magnets are generally used in typical applications to small motors. For drawing out the maximum characteristics according to a variety of material and processing, however, we need to change the preparation of the magnet, the rotor, and the motor design as well as to improve total performance including further miniaturization and efficiency. This report describes the recent examples of the efficient small motors and their magnets including development status.