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电机控制技术是数控切割机自动调高器的关键技术之一。提出了基于模糊控制技术和 PWM控制技术的数控切割自动调高器的直流电机控制系统方案，设计了模糊控制器，实验结果表明：通过使用模糊控制技术和 PWM控制技术能明显提高自动调高器的控制精度和灵敏度。“,”Motor control technology is the key factor for height automatic adjusting system of CNC cutting ma-chine.In this paper,one DC motor control technologyis put forward based on the fuzzy control technology and PWMcontrol technology,and the fuzzy controller is designed as well.Experimental results show that the control accuracy and sensitivity of height automatic adjusting system will be improved by using the fuzzy control technolo-gy and PWMcontrol technology.