Application of PLC in stepping motor control system
The application of PLC in stepping motor control system with the development of industrial automation in recent years, more and more people have learned it. Today, stepping motor manufacturers will talk about the application of plc in stepping motor control system, in the control process of PLC stepping motor, according to the control process of stepping motor and following up the characteristics of stepping motor, the control system is divided into several control modes, including start-stop and acceleration control of simple stepping motor, complex precise positioning control, etc.
Stepping Motor has a relatively simple control mode. Through the following introduction, beginners can quickly master the understanding of PLC control points.
PLC generates pulse to control stepping motor: stepping motor converts electric pulse signal into angular displacement or linear displacement open loop element.
The speed of the stepping motor depends on the input pulse frequency.
Changes in power-on and power-off rates will change the speed of the motor.
Therefore, adjusting the period of the input pulse can control the movement speed of the stepping motor. The specific contents are as follows: 1. Realization of control pulse: PLC outputs control pulse with a certain period, the control of the stepping motor is realized. For each pulse output, the stepping motor realizes the stepping function according to the width and frequency of the pulse.
Sharp stepping motor 2. Control of rotation direction: the rotation direction of stepping motor is closely related to the power-on sequence and power-on mode of internal windings. In the control process, the movement direction of the stepping motor is changed by changing the power-on sequence.
3. Speed control: PLC controls the running speed of the stepping motor, which is actually the frequency or commutation cycle of the clock issued by the control system, I . e. during the speed increase process, the output frequency of the pulse is gradually increased, during the deceleration process, the output frequency of the pulse is gradually reduced.
4. Step number control: the stepping motor takes one step forward for every pulse input, and its output angular displacement is proportional to the number of pulses input.
Therefore, the number of output pulses of PLC can be determined according to the output displacement of the stepping motor, I . e. the number of steps of the stepping motor can be controlled.
Tag plc control stepping motor