Abstract: Disclosed is a rotor for a motor for reducing the amount of usage of permanent magnets, in which a rotor structure in which multiple multilayered permanent magnets are embedded has a vacant space in which no permanent magnet is embedded, such that the amount of usage of the permanent magnets is reduced, and an output, torque, and efficiency of the motor are improved by using the space in which no permanent magnet is embedded. The present invention has an effect in that the amount of usage of the permanent magnets is markedly reduced during a process of manufacturing the motor, such that material costs are reduced, working time required to embed the permanent magnets is reduced, working time is greatly reduced, costs are reduced, the number of working processes is reduced, and assembly workability is improved.

Abstract: Disclosed is a rotor for a spoke motor, in which both rare-earth magnets and ferrite magnets are arranged in series, the rare-earth magnet has a smaller size than the ferrite magnet, and a small amount of rare-earth magnet is used, such that manufacturing costs may be greatly reduced, an efficient output may be produced, the motor may produce a higher output than a spoke motor model using only the ferrite magnet, and the motor may use a smaller amount of rare-earth magnet than an IPM type motor model, but may produce an output at a similar level to that of the IPM type motor model.

Abstract: The present invention includes a rotor with rotor sectors arranged around a center along the peripheral direction and a bridge between adjacent rotor sectors for connecting the adjacent rotor sectors, so that when inserting a shaft in the center of the rotor, it can be readily and firmly connected thereto by thermal and pressed insertion, and in the rotor having core plates laid on one another, a skew structure may be readily attained by connecting the core plates laid sequentially shifted by a given angle in one direction to the shaft.

Abstract: The present invention includes a rotor with rotor sectors arranged around a center along the peripheral direction and a bridge between adjacent rotor sectors for connecting the adjacent rotor sectors, so that when inserting a shaft in the center of the rotor, it can be readily and firmly connected thereto by thermal and pressed insertion, and in the rotor having core plates laid on one another, a skew structure may be readily attained by connecting the core plates laid sequentially shifted by a given angle in one direction to the shaft.

Abstract: The present invention relates to a process for preparing granular sodium percarbonate.