The second function of the stepping motor driver is that the stepping motor driver is an actuator that can convert the electrical pulse signal it bears into angular displacement.
When the stepper motor driver receives an electrical pulse signal, it drives its stepper motor to rotate a fixed angular displacement (We call it'Step angle')
Its rotation runs step by step at a fixed angle.
We can control the displacement of its angle by controlling the number of pulses it sends, so as to achieve the purpose of accurate positioning;
At the same time, we can also control the speed and acceleration of the stepping motor by controlling the frequency of its pulse signal, thus achieving the purpose of speed regulation and positioning.
It is widely used in various carving machines, Crystal grinders, medium-sized numerical control machine tools, EEG embroidery machines, packaging machines, fountains, dispensing machines, cutting and feeding systems, etc. Some large-scale and medium-sized numerical control machines with higher resolution requirements on the device.
Stepper motor driver, the phase number of the stepper motor refers to the number of coils inside the stepper motor, commonly used are two-phase, three-phase, four-phase, five-phase stepper motors.
The step angle of the common two-phase stepping motor is 1. 8 degrees, three phases are 1. 2 degrees, five phase is 0. 72 degrees.
When the stepping motor subdivision driver is not configured, the user mainly relies on selecting stepping motors with different phase numbers to meet the request of step angle.
If the subdivision drive is used, the phase number will become meaningless, and the user can change the step angle only by changing the subdivision on the drive.
After the stepper motor driver is subdivided, it will have a qualitative leap in the operation performance of the motor, but all this is generated by the driver itself and has nothing to do with the motor and the control system.
In use, the only point that users need to pay attention to is the change of step angle of stepping motor, which will affect the frequency of stepping signal sent by control system, since the step angle of the stepping motor will become smaller after subdivision, the frequency of the request stepping signal should be improved accordingly. Take 1.
8 degree stepping motor as an example: when the driver is in the half step state, the step angle is 0. 9 degrees, and in the ten subdivision step angle is 0.
18 degrees, so that under the condition that the motor speed is requested to be the same, the frequency of the stepping signal sent by the control system is 5 times that of the half-step operation in ten minutes.
The precision of ordinary stepping motor is 3 ~ of the stepping angle ~ 5%.
The single-step bias of the stepping motor will not affect the precision of the next step, so the precision of the stepping motor will not accumulate.
TAG stepper motor driver