The stepping motor is mainly controlled by PLC, and the slope method is usually used to control the acceleration and deceleration of the stepping motor. The slopes of acceleration and deceleration are symmetrical. The user only needs to set the acceleration and deceleration time to change the slope. Most PLCs also have a segmented control pulse frequency function, that is, the speed is divided into three parts to set the acceleration part, the uniform part and the deceleration part, so that the acceleration and deceleration can be asymmetrical, meeting the requirements of some equipment. Fast start and slow stop are required, or slow start and fast stop.
The stepper motor is controlled by a digital signal. If the pulse signal changes rapidly, the stepper motor will dampen the internal back electromotive force, and the magnetic response between the rotor and the stator will follow the change of the electrical signal, which will result in the lock-rotor and throw steps. On the other hand, the faster the angular acceleration, the greater the load inertia is to be overcome, and the insufficient torque can cause the stepper motor to become clogged. Acceleration and deceleration must be used to solve this problem. Individual powerful PLC settings can be used to control the profile curve. In textile machines, embroidery machines and CNC machine control systems, this calculation is often used to obtain acceleration and deceleration curves.
At present, the control of the stepper motor is controlled by a single chip microcomputer. Such devices are typically small in size and low in price, so stepper motors and controllers are smaller and less expensive. Therefore, the excellent curve design can release the moment of inertia when the load changes, helping the user to achieve this goal within a certain range.
When the stepper motor starts, the pulse frequency should be gradually increased. When the stepper motor is decelerated, the pulse frequency should be gradually reduced. This is what we call "acceleration and deceleration." Excellent motor performance prevents blockage and out of step.