A SIMPLE SPEED CONTROL TECHNIQUE AND PULSATING TORQUE ELIMINATIONMETHOD IN A BRUSHLESS DC MOTOR

This paper presents a theoretical derivation and computer simulation of an optimalAbstract speed controller for a brushless dc motor using feedback from a linear model running in parallel with the inverter-fed model. The intent of the feedback from the linear model is to eliminate torque ripples from the inverter drive. A nonlinear model of such a motor, transformed into a linear model by a local dipheomorphism (defined in section 2) and a new model is introduced in order to eliminate the undesirable effects of the inverter harmonics. Speed Control, Pulsating Torque, Brushless DC MotorKey Words dc n±U±Ç « ð ºAoM ®´M Sîow k®®¤oT® ð ºoU±P«B ºpBwL { ° ºoj ¯ ZBT®TwA §Bz « A kña ÇA /SwA kÇ { jBvTwA ºoUn±®A mrU BM ºpA± « »fi ¤k « ðMkw pA ¬C nj ,kµj» « ÄAnA An ðM°nB] ¬°kM ð BM ºn±U± « ®a »fios ¤k « /k®» « tme An oUn±®A od « pA »{B ¯ n°BTz £ ºB´]±ªU »fi ¤k « ðMkw J±¦f«BÇ ¯ RAoYA BU SwA k { »woí « ºkk] ¤k « ° k { ¥kLU »fi ¤k « M »íc± « dipheomorphism /k® tme An oUn±®A ºB´ñ¯±«nB