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CNC table economy closed-loop control

Pulse encoder feedback to the extension by the control circuit into the timer interrupt sources and 71. Park were inserted for the table control and fast positioning control. Encoder control circuit shown in Figure 3 J. From the incremental encoder signals are generally of phase 90. The two signals, after differentiation, plastic and other treatment was. To rhyme signal and z are screw forward pulse and reverse pulse Received Date: 19990506 Author: Wheel of Time (1968) * Male. Changchun, Jilin, Jilin Institute of Technology lecturer, Master of Engineering, mainly in electrical and mechanical systems of the first 3-spoke wheels, and when: economic numerical control table 55 of Figure 3, the closed-loop encoder control circuit impulse, the two signals added to the reversible counter add, subtract, count end count can be used as a basis for distinguishing systematic position table. The role of the figure latch is reversible counter preset number. The role of tri-state buffer is read from the reversible counter counts for position display output. Expand a little on the hardware system can be realized coordinate table control. 3 Control system software for the CNC table economy, the main control program widely used in the keyboard control mode. The structure is formed. The following table quickly locate far as procedures and interpolation procedures, 31 quickly locate the program that quickly locate the main program and interrupt service program flow shown in Figure 4, Figure 5. In the main program. Be judged on the end of the flag. To decide whether to locate the end of run, and when r. Count value reaches a specified interrupt pulse is generated. On the end of the flag is set. And to feed due to the shared counter. Therefore, when in rapid positioning were located, of course, also increase a counter to the direction and y separately. Figure 4 Figure 5 quickly locate the main program quickly locate the interrupt service routine addition, methods can be used to quickly locate the query been read by the reversible counter counts, and compared with the command pulses to determine whether it arrived at the designated location of the table control program is relatively simple. Interpolation interpolation block diagram Table 3.2 the main program and interrupt service routine shown in Figure 6, shown in Figure 7, Figure 6, the main program loop 7 insert interpolation Park ISR Mao Jilin Institute of Technology 56 Volume 20 as inserted x-table meeting to the movement and the Y to the feed,[link widoczny dla zalogowanych], respectively. So. Extended priority interrupt source movement has no effect on the interpolation. Interpolation control method using interrupts, the interrupt service routine of feeding marks were set. In the main program to judge on the feed logo. In the feed flag is not set until the operation is not the next step to ensure the accuracy of the interpolation table. 4 Conclusion CNC table economy proposed closed-loop control programs to ensure table stepper motor step in the case. Still be able to obtain higher accuracy, which in practice is of great significance