Three basic driver modes for stepper motor driver

time:2019-06-11 Browse:

  Stepper motor drivers have three basic stepper motor drive modes: full step, half step and subdivision. The main difference is the control accuracy of the motor coil current (ie the excitation mode).


Rtelligent Stepper Motor Driver
Rtelligent Stepper Motor Driver

  1,Full step drive

  In the entire stepping operation, the same stepper motor can be equipped with full-step/half-step drive or subdivision drive, but the operation effect is different. The stepper motor driver cyclically energizes the two coils of the two-phase stepper motor in accordance with the pulse/direction command (ie, the coil is charged to set the current). Each pulse of this drive mode will cause the motor to move at a basic step angle of 1.80. Degree (a total of 200 step angles in a circle of a standard two-phase motor).

  2,Half step drive

  In single-phase excitation, the motor shaft stops at the full step position. After the drive receives the next pulse, if the other phase is energized and remains energized, the motor shaft will move halfway 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 is cyclically rotated in a half-step manner of 0.90 degrees per pulse. All full-step/half-step drives can perform full-step and half-step drives by dialing the DIP switch on the drive. 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 actually using the whole/half-step drive.

  3, Subdivision drive

  The subdivision drive mode has two advantages of low speed vibration and high positioning accuracy. Subdivided stepper motor drives are widely used in stepping applications where low speed operation is sometimes required (ie motor shafts are sometimes below 60 rpm) or positioning accuracy requirements are below 0.90 degrees. The basic principle is to precisely control the current of the two coils of the motor according to the step size of the sine and cosine so that the distance of the one step angle is divided into several subdivision steps. For example, sixteen subdivisions can be driven in such a way that a stepper motor of 200 standard steps per revolution achieves an operational precision of 200 * 16 = 3200 steps per revolution (ie 0.1125°).

  Normally: The angular displacement of the motor shaft is the step angle each time a pulse is input during the entire step operation. In the half-step operating state, the angular displacement of the motor shaft is half step for each pulse input. angle. It is preferable that the stepping motor does not use the entire step state, and the vibration is large in the entire step state.

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