Application and selection of adjustable speed motors to optimize spares

The application of variable speed AC induction motors to process line requirements in the paper industry continues to increase. In addition to other advantages, the variable speed AC induction motor applied with an adjustable frequency controller can provide an opportunity to reduce the number of spare motors needed. By taking advantage of the induction motor\´s capability to be externally reconnected for different volts per Hz levels combined with the inverter\´s capability to operate with various "base frequencies", applications even with different base speeds may be covered with a single spare motor.<>