Our company is the first motor manufacturer in the domestic motor industry to use the variable frequency speed control system for rotor cast aluminum. It is the first to realize the manufacture of the largest cast aluminum rotor in China. It has developed a keyless casting aluminum process for the manufacture of two-stage motor rotors. The dimensional error control is accurate, the air passage is evenly divided, the cast aluminum technology is complete, and the overall technical level of the cast aluminum rotor is kept at the leading position in China.