<strong>Paper Title</strong><br>
A Comparative Study of Proportional Integral Controller and Fuzzy Logic Controller in Scalar Speed Control of Three Phase Induction Motor<br>
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<strong>Abstract</strong><br>
This paper presents a  performance  study of  the  proportionalintegral  controller andthe  fuzzy logic controller in 
scalar speed control of three phase squirrel cage induction motor drive. Here the speed control is possible by varying supply 
frequencyusing a voltage source inverter while keeping voltage to frequency ratio as a constant. Speed error is given as input
to  the  proportional  integral  controller,  and  speed  error  and  change  in  speed  error  are  given  as  input  to  the  fuzzy  logic 
controller.The  controller  output  controls  the  reference  of  sinusoidal  pulse  width  modulation.  Hence,  the  fundamental 
frequency  and  fundamental  voltage  of  inverter  output  can  be  varied  to  control  the  motor  speed.The  performance  of 
proportional  integral  controller  and  fuzzy  logic  controller  underload  torqueand  reference  speed  variationisevaluated  by 
simulation results in Simulink.