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本文在数字显示卡尺技术和力矩电机技术的基础上，把卡尺量程扩大到20米做成卡卷尺，运用力矩电机作为卡卷尺的卷紧机构和保证光栅编码器标尺光栅平直度的施力元件，发展了力矩电机自动调节的大量程数字显示卡卷尺测长技术，同时为力矩电机设计了线性自动调节电流源，并在实际应用中检测了其测量精确度。
Based on the digital display caliper technology and torque motor technology, this paper expands the caliper range to 20 meters to make the tape measure, uses the torque motor as the tape tensioning mechanism and the force element to ensure the grating encoder ruler flatness , Developed a large-scale digital display tape length measurement technology for automatic adjustment of torque motor, and designed a linear automatic adjustment current source for torque motor, and measured its measurement accuracy in practical applications.