There are many reasons why the motor rotates in one direction. Here are some reasons and corresponding measures.

1. Faults related to the motor cause the motor to rotate in one direction

1) Problems with the power supply of the motor

A stable power supply is required for stepper motors to work. If the motor supply voltage is insufficient or unstable, the motor can only rotate in one direction. At this time, you need to check the power supply and confirm whether the power supply is working properly.

2) Problems with the circuit connection of the motor

Problems with the stepper motor circuit connection can also cause the motor to only rotate in one direction. Common problems include incorrect connection of signal lines and incorrect motor phase sequence connection. The solution is to check whether the line connection is correct. You can try to swap the wiring of A+&A- or B+&B- to check whether the rotation direction of the motor changes.

3) The motor itself

If there is a problem with the motor itself, it will also cause one-way rotation. Common problems include: magnetic circuit asymmetry, damaged or aged windings, failed drive circuits, etc. The solution is to check the status of the motor and replace the faulty parts in time.

4) The problem of the coil of the motor

Problems such as open circuits or short circuits in the stepper motor windings will cause the motor to only rotate in one direction. At this time, it is necessary to check whether the motor coil is normal and replace the damaged parts in time.

5) Motor sliding problem

There needs to be some clearance between the rotor and stator in a stepper motor to allow for rotation. If it jams or gets stuck while turning, it may also cause the motor to only rotate in one direction. In this case, it is necessary to clean the inside of the motor and check whether there are problems such as aging, wear, etc.

6) Faults caused by the control method of the motor

A. One-way pulse control

Some controllers use one-way pulse control, that is, the controller only outputs pulses in one direction, causing the motor to only rotate in one direction. At this time, the controller needs to be replaced or the control method needs to be changed.

B. The phase sequence problem of the motor

Stepper motors need to be driven in the correct phase sequence. If the drive phase sequence is wrong, the motor can only rotate in one direction. In this case, the phase sequence connection method needs to be modified to ensure the normal operation of the motor.

2. Driver failure causes the motor to rotate in one direction

1)Driver connector

Reinsert the driver's connector and rewire it, and check whether the motor returns to normal.

If there are other normal drives, replace the connector on the normal drive to the problematic drive and check whether the motor returns to normal.

2)Drive settings

A. Check if the drive settings are correct. Some drives support two-phase or three-phase enable signals. If the enable signal is only sent to one phase, the motor can only rotate in one direction. The solution is to check the driver's settings and adjust it to be correct.

B. Some drivers can adjust the rotation direction of the motor by dialing the code. After adjusting the dial code, check whether the motor rotation direction has changed.

Check whether the 5V/24V dial on the top of the driver is selected correctly. If the dial selects 5V and the input voltage is 24V, it may burn out the internal components of the driver, which may cause the motor to only rotate in one direction. Use other normal drives to perform a cross test to check whether the drive is normal.

3. Faults related to cables

Check whether the cable is disconnected or poorly connected.

If there is another normal extension cord for the motor, try replacing it with a normal extension cord and check whether the motor returns to normal.