本文研究意匠图扫描机扫描误差产生的原因.提出克服扫描不均匀的措施:减小步进电机静态整步转矩,调整高压通电时间,使三相通电与二相通电时超调量相等.另外还提出采用“异号法”代替传统的“齿补脉冲法”来消除由齿轮间隙产生的定位误差,保证了扫描精度,此法提供了一种在一定的机械加工精度下提高定位精度的途径. In this paper, we study the cause of the scan error of the scanner, propose the measures to overcome the scanning nonuniformity: reduce the static step torque of the stepper motor, adjust the high-voltage energization time, and make the three-phase energization equal to the overshoot of two-phase energization. In addition, it also proposed to use the “different-sign method” instead of the traditional “tooth fill pulse method” to eliminate the positioning error caused by the gear gap and ensure the scanning accuracy. This method provides a method to improve the positioning accuracy under a certain machining accuracy way.