公开(公告)号：EP0334541A1

公开(公告)日：1989-09-27

申请号：EP89302541.1

申请日：1989-03-15

申请人： ELECTRONIC ACCURACY SYSTEMS LIMITED

发明人： Ford, Derek Gwynne ,  Postlethwaite, Scott Raymond

IPC分类号： G05B19/23

CPC分类号： G05B19/232

摘要： In order to compensate for errors in the positioning of a tool by a servo motor (4) resulting from mechanical inaccuracies in the machine tool slides (2) and drive (3), an analogue error compensation signal (12) is generated by a compensation unit (1) in which is stored calibration data relating to the components of the positioning error. The error compensation signal (12) is summed by a summation unit (14) with the uncompensated analogue position error signal (7) generated at the output of a CNC controller (5), and the resulting signal (15), as modified by the usual velocity feedback signal 10′ from the servo motor (4), is used to drive the servo motor (4). The resolution of the error compensation signal (12) is arranged to be greater than that of the position error signal (7), which is generally limited by the number of bits of the digital to analogue converter in the output stage of the controller (5). As the demand position is closely approached the servo (4) is driven substantially by the error compensation signal (12).

摘要翻译： 为了补偿由机床滑块（2）和驱动器（3）中的机械不准确造成的由伺服电动机（4）定位工具的错误，通过补偿产生模拟误差补偿信号（12） 其中存储与定位误差的分量相关的校准数据的单元（1）。 误差补偿信号（12）由加法单元（14）与在CNC控制器（5）的输出处产生的未补偿的模拟位置误差信号（7）相加，并且所产生的信号（15）由 来自伺服电动机（4）的10分钟的通常速度反馈信号用于驱动伺服电动机（4）。 误差补偿信号（12）的分辨率被设置为大于位置误差信号（7）的分辨率，其通常受控制器（5）的输出级中的数模转换器的位数限制 ）。 随着需求位置接近，伺服（4）基本上由误差补偿信号（12）驱动。