Direct drive induction motors

For years, the squirrel-cage induction motor has been the motor of choice for the pulp and paper industry, in both sine wave and variable frequency applications. Historically high torque, low speed applications used a combination of a reducer and either a squirrel-cage induction motor or a DC motor. This paper will address the use of an induction motor as an alternative to a motor with a reducer and provide rules of thumb on determining when direct drive should be considered.