Traditional DC motors have always dominated the motor drive system, but due to their inherent mechanical commutator and brushes, the motor capacity is limited, the noise is high and the reliability is low, which forces people to explore low-noise, high-efficiency and large-capacity drive motors. With the rapid development of power electronics technology and microcontroller technology, the DC brushless motor has the characteristics of small size, light weight, high efficiency, low noise, large capacity and high reliability, making it very likely to replace the traditional DC motor and become the mainstream of the motor drive system. Fuzzy controllers have the advantages of good robustness and strong anti-interference ability. The paper proposes a control system design scheme for DC brushless motors based on the speed loop fuzzy logic control theory, which ensures that the servo control system has excellent static and dynamic characteristics, thus meeting the needs of more applications. The paper specifically includes the following parts: First, from the perspective of motor body and control, the key problem that needs to be solved in practical applications of DC brushless motors is explained: electromagnetic torque pulsation. The various causes of electromagnetic torque pulsation are analyzed in detail, especially the ripple torque pulsation generated by phase current commutation. Secondly, this paper makes a detailed analysis of the working principle of the brushless DC motor and establishes a mathematical model of the three-phase brushless DC motor. And the control system simulation model of the three-phase brushless DC motor is established by using MATLAB/SIMULINK software. The simulation model samples the dual-loop system (speed-current dual closed-loop control) commonly used in motor control systems. In order to improve the static and dynamic characteristics of the system, the outer loop of the speed adopts a fuzzy PI regulator, and the inner loop of the current adopts a PI regulator. The rotor position is detected by the induced potential of the DC brushless motor. The simulation results show that the control system of the simulation model is completely consistent with the theoretical analysis, thus proving the effectiveness of the model. Then, the experimental diagram of the servo system is preliminarily designed. The TMS320LF2407 digital signal processor (DSP) produced by TI is used as the core chip of the entire control circuit, and a 40w DC brushless motor is used as the controlled object to complete the speed control of the servo system. Finally, the future work is given a prospect and the content of the full text is summarized.
You Might Like
Recommended ContentMore
Open source project More
Popular Components
Searched by Users
Just Take a LookMore
Trending Downloads
Trending ArticlesMore