一种割草机无刷直流电机调速系统设计

Design of a brushless DC motor speed control system for lawn mower

针对割草机电机控制过程中存在的转矩脉动大,动态性能差等问题,设计了一种割草机无刷直流电机的矢量调速系统。使用滑模控制器代替PI控制,用于电机的速度调节,并分别设计了基于脉振方波高频注入和滑模观测器算法的位置估计系统,提出了一种通过分析电机在机械角度旋转一周内两者的误差,来切换位置估计方法的策略,实现了电机在全转速下的位置估计。在MATLAB中对算法进行仿真,并利用STM32F302芯片搭建硬件实验平台。结果表明,两种转子位置估计方法能够平稳切换,提高了转子位置估计的准确度,滑模控制器的使用降低了转速调节时间,提高了系统鲁棒性。

For the mower motor torque ripple control process exists, and poor dynamic performance, the design of the vector system speed brushless DC motor mower. Instead of using the PI control sliding mode controller for adjusting the speed of the motor, and a position estimation system were designed based on the high frequency square wave oscillator pulse injection SMO proposed a revolution in the motor mechanical angle analysis within the two errors, the strategy of switching the position estimation method realizes the position estimation of the motor at full speed. Simulation in MATLAB, and take advantage of STM32 F302 chip built hardware test platform. The results show that the two rotor position estimation methods can be switched smoothly, which improves the accuracy of the rotor position estimation. The use of the sliding mode controller reduces the speed adjustment time and improves the robustness of the system.