Improvement Speed Regulation in Open Loop V/F Control of Three Phase Induction Motor Drive

Author (s):

  1. H. M. Karkar, Atmiya Institute of Tech. and Science, Rajkot, Gujarat, INDIA,


Induction motor is widespread in industrial applications due to various methods available for speed control. V/f open loop is most popular due to its simplicity. The main objective is to maintain the speed at fixed reference. Here, the V/f ratio is maintained constant in order to get constant torque over the entire operating range. In this method speed regulation is poor. To investigate the open loop control schemes for controlling induction machine, various result obtained at different V/f ratio. By change in V/f ratio in open loop strategy speed regulation can be improved below rated capacity of three phase induction motor drive. By proper selection of V/f ratio speed regulation can be improved.

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