1. Stroke control: The stroke of the CNC slide is realized by digital control. Since the stroke of the slide is proportional to the total rotation angle of the stepper motor, it is only necessary to control the total rotation angle of the stepper motor, and the total rotation angle of the stepper motor is proportional. The number of control pulses input; therefore, the number of pulses output by plc can be determined according to the displacement of the servo:
n= DL/d (1)
DL - the displacement of the servo (mm), d - the pulse equivalent of the servo (mm / pulse)
2. Feed speed control: The feed speed of the servo mechanism depends on the speed of the stepper motor, and the speed of the stepper motor depends on the input pulse frequency; therefore, the PLC output can be determined according to the feed speed required by the process. Pulse frequency:
f=Vf/60d (Hz) (2)
Where Vf - servo feed rate (mm / min)
3, feed direction control
The feed direction control is the steering control of the stepper motor. The steering of the stepping motor can change its forward and reverse direction by changing the energization sequence of each winding of the stepping motor, or can be realized by changing the output sequence of the hardware loop distributor by the direction control signal output by the PLC.
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