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A6-2 - Sedma Nacionalna Konferencija so Me|unarodno U~estvo...

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A SLIDING MODE CONTROL OF BRUSHLESS DC MOTORS APLIED IN DENTAL MICROMOTOR SYSTEMS Igor Karaskakovski 1 , Goce V. Shutinoski 2 1 OKTA – REFINERY Skopje, [email protected] 2 SS. Cyril and Methodius University, Faculty of Electrical Engineering, Karpos II bb, P.O.B 574, 1000 Skopje, [email protected] Abstract – Analysis and simulation of sliding mode controlled brushless DC motor (BLDC) applied in dental equipment is presented. Comparison of the main characteristics of the brushless (BLDC) versus brush-type DC motor (BDC) under various operating conditions shows certain advantages of BLDC over BDC in dental specific micromotor applications. Keywords – Brush-type (BDC) Direct Current motor, Brushless (BLDC) DC motor, Sliding Mode Control (SMC) 1. INTRODUCTION One of the most utilized parts of the equipment in dentist’s everyday practice is the micromotor. It is a rotating energy source applied in the main dental instruments used for drilling teeth, cutting bones or similar dental tasks. These micromotors must satisfy several working requirements among which the most important are the equipment robustness and the speed constancy independently of the presented load. They must operate at safely low voltage, and must give the possibility of setup the required speed by the dentist. They need to be small, light and quiet as well and to exhibit no vibrations in performing precise movements, etc. The micromotors mostly used in the past were those with brush-type DC motors, since they have relatively low market price and were suitable for mass production. However, this type of motors exhibits limitations both in the rotating speed and in the torque as a consequence of the sparking brushes and because the driving windings are located at the rotating part. It is generally known that the brushed micromotors are working at lower speed, accelerate slower, dissipate higher heat power, they support lower torque and they are much heavier in comparison to brushless types, [1]. From the dentist point of view this means undesirable vibrations, inaccurate movements and lower efficiency in their everyday work. All of these characteristics make them worst choice for dental application in comparison to BLDC motors. That is why nowadays more and more the BLDC based micromotors are replacing the BDC, [2], [3]. In the next section the general scheme of BLDC based system is presented and described by its state equations. Followed by the theoretical analysis of the sliding mode control, one possible model used for simulation is explained. Results obtained from simulation of a model in “MATLAB” under various operating conditions are presented. Finally, appropriate conclusions about the application of BLDC in dental “micromotor“ application are outlined.
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  • Spring '10
  • PopovskiBorislav
  • Electric motor, shaft speed, various operating conditions, BLDC, feedback signal delay, mode control

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