BRUSHLESS MOTOR

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PROBLEM TO BE SOLVED : To provide a brushless motor which is improved in heat resistance against a temperature load applied to a motor, caused by a temperature rise by overload drive or the like and heat generated in use in a high-temperature atmosphere, and does not cause the lowering of torque even in the high-temperature atmosphere.SOLUTION : The brushless motor comprises a rare earth magnet which is arranged at a rotor or a stator, and is characterized in that the rare earth magnet is of an Nd-Fe-B system whose surface is cleaned by being immersed into an acid liquid after performing grain boundary reforming by being diffusely immersed with an M element (M is Pr, Dy, Tb or Ho) from the surface into its inside, and by making an ultrasonic wave act on the acid liquid.COPYRIGHT : (C)2009, JPO&INPIT