According to the material characteristics filled in the motor rotor slots, there are wound rotor, cast aluminum rotor and permanent magnet rotor. Comparatively, the cast aluminum rotor is the most widely used, of course, also due to some cost and process advantages of this type of rotor.
The slot shape of the cast aluminum rotor is not restricted by the profile, allowing for the arbitrary selection of the best slot shape to improve the motor’s starting performance. The copper bars of the rotor account for approximately 40% of the total copper usage in the motor. Utilizing a cast aluminum rotor can significantly reduce the material cost of the motor. The cast aluminum conductor fills the entire rotor slot, with a slot fill rate approaching 100%, which is conducive to heat dissipation. The rotor fan blades and end rings are cast together, enhancing the heat dissipation capacity and eliminating the need for additional fans, thus saving some processing steps. The structure of the cast aluminum rotor is symmetrical and compact, with the balance column and end rings cast together, making it easier to achieve mechanical balance. The production cycle is short, requiring less working hours and having a lower cost, making it suitable for mass production.
For instance, for high-efficiency high-power motors, copper bar rotors or cast copper rotors may be necessary to achieve the desired performance.
The quality of the laminations during the punching process directly affects the quality of the core assembly. Incomplete slot shapes will affect the wiring quality; excessive burrs, excessive or insufficient size differences between the teeth, as well as the accuracy and tightness of the core size, will all affect the magnetic conductivity and losses.
Post time: Sep-17-2025