Stepping motor is a kind of motor with low rotor inertia, high positioning accuracy, small error and simple control, and it is one of the main executive components in the field of motion control.
As an industrial control computer, PLC has modular structure, flexible configuration, high-speed processing speed, accurate data processing ability, multiple control functions, network technology and superior cost performance, and is one of the widely used control devices.
Extended data:
The highest stepping frequency that the stepping motor can respond without losing step is called "starting frequency"; Similarly, "stop frequency" refers to the highest stepping frequency at which the system control signal suddenly turns off and the stepping motor does not cross the target position.
The starting frequency, stopping frequency and output torque of the motor should be adapted to the moment of inertia of the load. With these data, we can effectively control the speed change of stepping motor.
Using PLC to control the stepping motor, the pulse equivalent, upper pulse frequency limit and maximum pulse number of the system should be calculated according to the following formula, and then PLC and its corresponding functional modules should be selected. According to the pulse frequency, the required frequency of high-speed pulse output of PLC can be determined, and the bit width of PLC can be determined according to the number of pulses.
Features of stepping motor:
1, the angular displacement of stepping motor is strictly proportional to the number of input pulses, and the motor has no accumulated error after running for one week, which has good follow-up.
2. The open-loop digital control system composed of stepping motor and driving circuit is very simple, cheap and reliable. At the same time, it can also form a high-performance closed-loop digital control system with angle feedback function.
3. The stepper motor has fast dynamic response and is easy to start, stop, reverse and change speed.
4. The rotating speed can be smoothly adjusted in a fairly wide range, and high torque can still be ensured at low speed.
5. Stepping motor can only run by pulse power supply, and cannot directly use AC power supply and DC power supply.