What is the stepper motor driver subdivision?
The 8 states change again and again, the motor rotates clockwise, the motor rotates 45 degrees each time, and the 8 pulse motors rotate for one week. Compared with the power in sequence (1), it has a half step angle. In order to ensure that the output torque of the motor is even, the coil current of the A and B phases should be adjusted so that the resultant forces of the A and B phases are the same at each position. Fig. 2 shows the ratio of the coil current of the A and B phases when the motor four is subdivided. The relationship between the coil current and the rotation angle of the A and B phases is shown in figure 3.
If the winding is under the action of the control pulse, the direction of the circuit is in accordance with the direction of the current:The four states change again and again, and the motor can rotate clockwise. Once the control pulse is applied, the direction of energizing is changed once, so that the motor rotates one step, that is, 90 degrees. 4 pulses, the motor turns a circle. The principle of a subdivision driver is to change the angle of the resultant magnetic field by changing the magnitude of the A, B phase currents so that a step angle can be subdivided into multistep steps. When the A and B phase windings are energized at once, the rotor will stop in the middle of the A and B magnetic poles, as shown in Figure 1 (b), (D). If the direction of the electricity in accordance with the order:
Fig. 2 is a schematic diagram of a two-phase stepping motor with 2 windings, A and B. When a winding is energized, the stator pole produces a magnetic field that attracts the rotor to the magnetic pole.
Basic concepts of segmentation:Stepper motor driven by subdivision drive, the smaller step angle. If the driver operates in 10 segments when the step angle for fixed step angle "is: 1/10, when the driver operating in segments of the whole step state control system, each made a step pulse, the rotation of the motor 1.8; and subdivision drive work in 10 fine state, motor only 0.18 degree rotation. The subdivision function is generated by the phase current of the motor, which is controlled by the precision of the drive, and is independent of the motor.
