Die-cast rotors for induction motors

DIE-CAST rotors for induction motors have been manufactured for ratings from about 1/200 to 50 horsepower for approximately 25 years, and more recently rotors have been die-cast for the larger ratings through 125 horsepower. They have many advantages to both the manufacturer and customer. The die-cast rotor is a solid and fairly homogeneous mass that retains its balance, and in general, gives the customer good all-around performance. The manufacturer generally can make die-cast rotors at a lower cost which is to the advantage of both the customer and manufacturer. Since World War II, aluminum, which is used in die-cast rotors, has been more plentiful than copper and at a lower cost, thus making it easier for the manufacturer to maintain his production.