Speed Control System of BLDC Motor Based on DSP TMS320F28027F

Abstract

Brushless Direct Current (BLDC) motor is a development of DC motor which uses a three-phase voltage source. BLDC motor has the advantages of high efficiency, good speed and torque characteristics, low operating noise, and long operating life. BLDC motor requires a control system which can improve a stable and responsive speed response to maximize these advantages. This research discusses controlling BLDC motor speed with Proportional Integral (PI) control and Field Oriented Control (FOC) methods based on Digital Signal Processor (DSP). The initial stage of the research is to simulate the PI control to see the results of control before it is implemented on the BLDC motors. The simulation results show that the value of Kp is 0.01165 and Ki is 0.10699. This research also applies the FOC method using the Texas Instruments Insta SPIN-FOC library and the implementation uses the DSP TMS320F28027F. The results obtained indicate that the response is good with a small overshoot value and steady state error so that it produces an output with low ripple and fast response. The designed control system is capable of tracking speed at 500 rpm, 700 rpm and 900 rpm setpoints. The BLDC motor speed test for each setpoint results a settling time value of 0.30 s, 0.18 s and 0.14 s, an overshoot value of 0.2%, 1.14% and 0.22% and a steady state error value by 1 %, 0% and 0.22%.