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Your location: Home- > Technical Support- > Common problems and related solutions of stepper motors
A stepper motor controller is an electronic product that can emit a uniform pulse signal. After the signal sent to the stepper driver is converted by the driver into a strong current signal required by the stepper motor, the stepper motor is driven. The stepper motor controller can accurately control the stepper motor to turn at every angle. The following describes the common problems and related solutions of stepper motors.
1. How to control the direction of the stepper motor?
The direction level signal of the control system can be changed.
2. The wiring of the motor can be adjusted to change the direction. The specific method is as follows:
For two-phase motors, you only need to switch the motor wires of one phase into the driver, such as A + and A- exchange.
For three-phase motors, exchange the motor wires of two adjacent phases, such as: A, B, and C three-phase, and exchange A and B two-phase. Three. Stepping motors have large vibrations and noise.
This situation is encountered because the stepper motor works in the oscillation area. The solution: 1. Change the input signal frequency CP to avoid the oscillation area. 2. Use subdivision driver to reduce the step angle and make the operation smoother.
4. Why does the motor not run after the stepper motor is powered on? There are several reasons why the motor will not turn:
1. Overload stall (At this time, the motor has a howling sound.
2. Whether the motor is offline.
3. Whether the control system has a pulse signal to the stepper motor driver and whether there is a problem with the wiring.
Five, stepping motor jitter, can not run continuously, what should I do?
In this case, first check whether the winding of the motor and the driver are connected correctly, check whether the frequency of the input pulse signal is too high, and whether the design of the frequency rise and fall is unreasonable.
6. Under what circumstances is the offline signal FREE of the hybrid stepping motor driver generally used?
When the offline signal FREE is at a low level, the current output from the driver to the motor is cut off, and the motor rotor is in a free state (offline state). In some automation equipment, if the driver is required to be continuously powered, the motor shaft can be directly rotated (manual mode), the FREE signal can be set low, the motor can be taken offline, and manual operation or adjustment can be performed. After the manual operation is completed, set the FREE signal high to continue the automatic control.
7. How to choose the power supply for stepper motor driver?
Determine the power supply voltage of the driver, and then determine the working current; the power supply current is generally determined according to the output phase current I of the driver. If a linear power supply is used, the power supply current is generally 1.1 to 1.3 times that of I; if a switching power supply is used, the power supply current is generally 1.5 to 2.0 times that of I.
8. Does the number of subdivisions of the subdivision driver represent accuracy?
Subdivision is also called micro-step. The main purpose is to reduce or eliminate the low frequency vibration of stepper motor. Improving the running accuracy of the motor is only an incidental function of subdivision technology. For example, for a two-phase hybrid stepping motor with a step angle of 1.8 °, if the number of subdivisions of the subdivision driver is set to 4, the resolution of the motor is 0.45 ° per pulse. Can the accuracy of the motor reach or be close to 0.45 °, also depends on other factors such as the precision of the subdivision current control of the subdivision driver. The accuracy of subdivision drivers from different manufacturers may vary greatly; the greater the number of subdivisions, the more difficult it is to control the accuracy.
9. Why does the torque of a stepping motor decrease as the speed increases?
When the stepping motor rotates, the inductance of the windings of each phase of the motor will form a reverse electromotive force; the higher the frequency, the greater the reverse electromotive force. Under its effect, the phase current of the motor decreases with the increase of frequency (or speed), resulting in a decrease in torque.
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