Common faults of stepper motors - PAY for CNC components
Common faults of stepper motors
Common faults of stepper motors

1. The motor does not run

   1) The driver has no power supply voltage

   2) The drive fuse is blown

   3) Driver alarm (overvoltage, undervoltage, overcurrent, overheating)

   4) The connection between the driver and the motor is disconnected

   5) Improper system parameter settings

   6) The driver enable signal is blocked

   7) Poor contact of the interface signal line

   8) Driver circuit failure

   9) The motor is stuck or malfunctions

   10) The motor is rusty

   11) The command pulse is too narrow, the frequency is too high, and the pulse level is too low

2. The motor stalls after starting

    1) The command frequency is too high

    2) The load torque is too large

    3) Acceleration time is too short

    4) The load inertia is too large

    5) The power supply voltage decreases

3. The motor runs unevenly and vibrates.

    1) The command pulse is uneven

    2) The command pulse is too narrow

    3) The command pulse level is incorrect

    4) The command pulse level does not match the driver

    5) There is noise in the pulse signal

    6) Pulse frequency resonates with machinery

4. The motor runs irregularly and swings forward and reverse.

     1) The command pulse frequency resonates with the motor

     2) External interference

5. Motor positioning is inaccurate

     1) The acceleration and deceleration time is too small

     2) There is interference noise

     3) Poor system shielding

6. Motor overheating:

      1) The working environment is too harsh and the ambient temperature is too high

      2) Improper parameter selection, such as the current is too large and exceeds the phase current

      3) The voltage is too high

7. Stopping during work:

       1) Drive power failure

       2) The motor coil is short-circuited or grounded.

       3) Winding burned out

       4) Pulse generation circuit failure

       5) Debris stuck

8. Noisy

      1) The motor runs in the low frequency area or resonance area

      2) Pure inertia load, short program, frequent forward and reverse rotations

      3) Magnetic circuit hybrid or permanent magnet rotor magnets run in single step or in the out-of-step area after demagnetization

      4) The directional mechanism of the permanent magnet unidirectional rotating stepper motor is damaged.

9. Lost steps or multiple steps

       1) The load is too large and exceeds the carrying capacity of the motor

       2) The load is suddenly large and sometimes small

       3) The moment of inertia of the load is too large, resulting in loss of step when starting and overshooting when stopping.

       4) Uneven size of transmission gap

       5) Parts caused by transmission clearance have elastic deformation

       6) The motor works in the oscillation out-of-step zone

       7) Improper use of circuit total reset

       8) Interference

       9) The stator and rotor are aligned with each other

10. Weakness or reduced output

        1) Drive power failure

        2) An error occurs inside the motor winding

        3) The motor winding touches the casing, resulting in a phase-to-phase short circuit or

           Threads fall off

        4) The motor shaft is broken

        5) The air gap between the motor stator and rotor is too large

        6) The power supply voltage is too low

  11.Cannot start

      1) Wrong way of working

      2) Drive circuit failure

      3) During remote control, the line voltage drop is too large

      4) Incorrect installation, or faults in the motor's bearings, stops, etc. prevent the motor from rotating.

      5) N and S poles are connected incorrectly

      6) Long-term storage in a humid place may cause the motor to rust.
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