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矿用风机转速闭环控制系统中的速度传感器是精密仪器,在恶劣的环境中长时间工作容易损坏;且速度传感器本身价格昂贵,测速准度受安装精度的影响,维护较困难。为提高转速的估算精度,提出在风机的双闭环控制系统中引入无速度传感器控制技术,研究了基于MRAS的转速估算方法,并应用于斩波串级调速系统中,对整个系统建立了仿真模型。仿真试验表明,改进的控制系统可控制风机在转速为960~1450r/min之间连续可调,并且具有良好的动静态特性,实际转速能够很好地跟随指令转速,误差在±3.13%之内。与带速度传感器控制系统相比,该系统在提高可靠性的同时,还能降低硬件成本。
Mine speed sensor closed loop speed control system is a precision speed sensor, working in harsh environments easy to damage for a long time; and the speed sensor itself expensive, speed accuracy by the installation accuracy, maintenance is more difficult. In order to improve the speed estimation accuracy, a speed sensorless control technology is introduced into the double closed-loop control system of the wind turbine. The MRAS-based speed estimation method is introduced and applied to the chopper cascade speed control system. The simulation of the whole system is established model. The simulation results show that the improved control system can control the fan to be continuously adjustable between 960 ~ 1450r / min and has good dynamic and static characteristics. The actual speed can follow the command speed well with the error within ± 3.13% . Compared with the speed sensor control system, the system can improve the reliability, but also reduce the hardware cost.