# Principle and function of stepping motor driver

by：V&T Technologies     2020-01-10
The principle and function of stepping motor driver, what is the principle of stepping motor driver? What is the role of stepper motor driver? Sharp electromechanical answers for everyone. Stepping motors are widely used in electronic equipment, textile equipment, medical equipment, advertising equipment and other fields. The stepping motor and the stepping motor driver form the stepping motor drive system. The performance of the stepping motor drive system depends not only on the performance of the stepping motor itself, but also on the advantages and disadvantages of the stepping motor driver. The research on stepper motor driver is almost synchronized with the research on stepper motor. Stepper motor driver is an actuator that converts electrical pulses into angular displacement. When the stepping driver receives a pulse signal, it drives the stepping motor to rotate a fixed angle (Called'Step angle') Its rotation runs step by step at a fixed angle. The angular displacement can be controlled by controlling the number of pulses, thus achieving the purpose of accurate positioning; At the same time, the speed and acceleration of the motor can be controlled by controlling the pulse frequency, thus achieving the purpose of speed regulation and positioning. It is widely used in large and medium-sized numerical control equipment with high resolution, such as engraving machine, Crystal grinding machine, medium-sized numerical control machine, EEG embroidery machine, packaging machine, fountain, glue dispenser, cutting and feeding system, etc. The phase number of stepping motor refers to the number of coil groups inside the motor. Commonly used are two-phase, three-phase, four-phase and five-phase stepping motors. The step angle of motor is different due to different phase numbers. Generally, the step angle of two-phase motor is 1. 8 degrees, three phases are 1. 2 degrees, five phase is 0. 72 degrees. When there is no subdivision driver, users mainly rely on selecting stepping motors with different phase numbers to meet the requirements of step angle. If a subdivision drive is used, the number of phases will become meaningless, and the user can change the step angle only by changing the subdivision on the drive. After the 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 the user needs to pay attention to is the change of step angle of the stepping motor, which will affect the frequency of the stepping signal sent by the control system, because the step angle of the stepping motor will become smaller after subdivision, the frequency of the stepping signal is required to be increased 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 required 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. Generally, the precision of a stepping motor is 3 ~ of the stepping angle ~ 5%. The single step deviation of the stepping motor will not affect the precision of the next step, so the precision of the stepping motor will not accumulate. Related reading: Composition of stepping motor power supply and driver control part stepping motor driver system latest technology development TAG stepping motor driver
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