Research And Design Of Multi-rotor UAV Power System Based On FOC

After many years of development,multi-rotor drones have become very mature.However,its power system has some flaws that have not been solved.In this paper,a multi-rotor UAV based on field-oriented control(FOC)drive technology is designed to overcome the shortcomings of large torque ripple,obvious vibration,high noise,and slow response speed of the existing UAV powertrain system.power system.Sensorless FOC technology has the characteristics of small torque ripple,low vibration,good dynamic performance and quietness.In recent years,it has begun to find applications in the field of home appliances,such as outdoor air conditioners,highend vacuum cleaners,and high-end floor fans.Applying sensorless FOC technology to drone power systems can significantly improve current power system deficiencies.This paper introduces the basic principles of FOC drive technology,combines the characteristics and requirements of UAV power system,and analyzes the current engineering application of sensorless FOC technology applied to the high speed of UAV power system,and proposes the corresponding Engineering implementation and improvement methods.By using the MCU with the conventional FOC calculation hardware acceleration and the corresponding hardware design cooperation for high rotation speed,the noninductive FOC engineering at high speed can be realized.And on the basis of the current loop,a speed control strategy is added to increase the Q-axis voltage closed-loop loop and the D-axis current loop remains unchanged,so that the speed response of the power system proposed by the article is faster,and the speed control mode is improved.There is a similar dynamic system speed control method to easily replace the existing power system.The article also details the system hardware and software design.The hardware design includes power output circuit,current sampling circuit,voltage sampling circuit,back-EMF acquisition circuit,and other necessary hardware protection circuits.In software design,the program structure of the driver software,as well as the processing of key parts.And added more protection features to improve the system's security.Compared with the existing power system,the proposed UAV power system has smaller torque ripple,smoother operation,and faster response speed.Each of the indicators is superior to the traditional square wave power system.