Copper Die Cast Rotors (A TECHNOLOGICAL REVOLUTION)
The Efficiency Advantage Using Die Cast Copper Rotors
Motors with Copper Rotors Can Cost Less to Produce
Motor Test Results, Copper Compared to Aluminum from CDA
Designing Squirrel Cage Rotor Slots with High Conductivity
There has been, in recent years, an effort to make cast copper rotors for industrial use induction motors. The objective is to make motors more efficient because of the higher conductivity of copper. In addition, the reduced losses in such motors may lead to better design flexibility and therefor motors which are more compact.
In this paper we examine the tradeoff between running efficiency and starting performance. In order to understand how induction motors work it is necessary to have a good model for the conduction properties of the conductors in the slots of the rotor.