Three modes of stepper motor driver, stepper motor and stepper motor driver constitute a stepper 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 of stepper motor driver is almost synchronized with the research of stepper motor.
Stepper motor drivers have three basic stepper motor drive modes: full step, half step and subdivision.
The main difference lies in the control accuracy of motor coil current (Incentive mode).
1 whole step Drive, in the whole step operation, the same step motor can be equipped with full step/half step drive or subdivision drive, but the operation effect is different.
The stepper motor driver circulates the two coils of the two-phase stepper motor (That is, the coil is charged to set the current).
Each pulse of this drive mode will cause the motor to 1. The basic stepping angle of 80 moves. Degree (
A total of 200 stepping angles in the circle of the standard two-phase motor).
2 half-step Drive, in single-phase excitation, the motor shaft stops at the full-step position.
After the driver receives the next pulse, if the other is electrified and remains energized, the motor shaft will move half and stop. In the middle of two adjacent full-step positions.
Therefore, the single-phase and then two-phase excitation stepping motor of the two-phase coil takes 0. A 90-degree half-step circular rotation.
All Yamashito Electric's full-step/half-step drivers can perform full-step and half-step drives, which are selected by the dial-up position where the drive DIP is on and off.
Compared with the full-step mode, the half-step mode has the advantages of double precision and low-speed vibration, so the half-step mode is usually used when the whole/half-step drive is actually used.
Three subdivision drivers, subdivision drive mode has two advantages of low speed vibration and high positioning accuracy.
Subdivision stepper motor drivers are widely used in Stepper applications that sometimes require low speed operation (That is, the motor shaft is sometimes less than 60 rpm)Or the positioning accuracy requirement is lower than 0. 90 degrees.
The basic principle is to accurately control the current of the two coils of the motor according to the steps of sine and cosine, so that the distance of one-step angle is divided into several subdivision steps.
For example, sixteen segments can be driven in such a way that a stepping motor with 200 standard steps per revolution achieves 200*16 = 3200 steps per revolution (That is, 0. 1125 °)The operating accuracy.
Usually: each time a pulse is input during the entire stepping operation, the angular displacement of the motor shaft is a stepping angle.
In the half-step operation State, the angular displacement of the motor shaft is half-step for each pulse input. Angle.
It is better for the stepping motor not to use the whole step state, and the vibration is large in the whole step state.
TAG stepping, motor driver, drive mode