Analysis of the Effects of Three Various Current Control Methods on BLDC Motors

Abstract

Brushless direct current motors are very popular motors in a wide application area thanks to their superior features. Brushless motors are the most preferred motors in applications such as domestic, robotics, office machines, medical, military and space applications, unmanned aerial vehicles applications because they meet the special requirements of these applications. Brushless direct current (BLDC) motors have high volume torque ratio, high efficiency, fast dynamic response; they offer linear torque/speed characteristics. Speed control of BLDC motors achieves by implementing pulse width modulation (PWM) technique. Various PWM control methods are put in to use for controlling of BLDC motor speed. These PWM methods have some certain advantages and disadvantages. In this study, three current control PWM methods which are mostly used in practices are examined. These are full conduction mode, independent and complementary PWM methods. For this purpose, three BLDC motor pre-drivers have been designed and manufactured and the effects of these three drivers on the BLDC motor have been examined. It has been found that complementary PWM mode has given to BLDC motor fast dynamic response. Full conduction mode has drawn higher dc link current from DC power supply. Independent PWM method performance is very close to complementary PWM method.

The Performance Comparison of the SiC and Si Mosfets Used in the 3-Phase Brushless DC Motor Drives for Electric Vehicles

“…Due to these structures, there are more than one control method. [24] The driver circuit is created in the PSIM program, as in Fig. 1.…”