Servo Motor or Stepper Motor?

When selecting the motor for the module slide, how to decide whether to use servo motor or stepper motor?

Sometimes users are not sure whether to use servo motor or stepper motor when matching the motor of the module slide. Here are some reference suggestions on the differences between the main performance parameters of the two.

  1. Power supply and work flow
    The power supply of the servo motor comes from the relay switch and the motor itself. The workflow is to connect the power switch and then connect the servo motor. The power required by the stepping motor comes from the plate, the motor itself and the driver. Signal pulse and direction pulse need to be connected.
  2. Control mode
    The rotation angle of the servo motor depends on the pulse time. The driving system is closed-loop control, and generally there will be no step loss or overshoot. The rotation angle of the stepping motor depends on the number of pulses. If the open-loop control system is selected, it is easy to lose step or locked rotor when starting frequently or the load is too high, and overshoot may occur when stopping operation.
  3. Output torque
    The output torque of the servo motor is constant within the rated speed, that is, the rated torque. The torque of the stepping motor decreases with the increase of the speed, and the higher the speed, the more intense the decrease. Therefore, the working speed is generally 400 ~ 500 rpm.
  4. Operation stability
    The servo motor has the functions of resonance suppression and frequency analysis, so its operation is very stable. The stepper motor is prone to low-frequency vibration when running at low speed, especially when no-load, the frequency can reach 50% of the take-off frequency, which seriously affects the stability of the equipment.
  5. Overload capacity
    The working principle of servo motor determines that it has the inertia torque generated by the inertia load at the moment of starting. When using stepping motor, if larger torque is selected to overcome the inertia torque, the production capacity function will be wasted during normal operation.
  6. Speed response time
    It takes only a few milliseconds for the servo motor to accelerate from stop to start to working speed, which is conducive to rapid start-up and stop control. The stepping motor needs 200 ~ 400 milliseconds from stop to operation to working speed.
    It can be seen that the servo motor has high power, high speed, high precision and high response speed, which is suitable for the occasions of high load, high speed, position and torque control, while the stepping motor is more suitable for the occasions with low speed requirements and angle control. The user can according to the application scenario of the module slide The appropriate motor shall be selected according to the comprehensive conditions such as performance parameter requirements and budget.

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