Soft Starting on BLDC Motor Using Six-Step Inverter with Current Damping


  • Ony Asrarul Qudsi Politeknik Elektronika Negeri Surabaya



This journal presents the detailed design and implementation of acceleration control techniques for BLDC motors for soft starting with reducing current. In general case, the increase current is very high when the motor accelerates, even more so in the starting condition. This can lead to inefficient use of energy. This research proposes a BLDC motor acceleration control design using the six-step PWM method which will control the three-phase inverter. Hall effect sensors are used as input signals for the microcontroller and are used to adjust the PWM output signal for the switching process on the mosfet. In this study, the STM32F407 microcontroller was used. The test has been carried out in two conditions, namely without current limitation and with current limitation with a set point of 250 rpm. The results show that in conditions without current limitation, the acceleration time is fast enough with an average starting current of 44A, whereas when in conditions with a current limitation of 22A, the acceleration time is slower but the average starting current is 22A.