Stepper or Servo

How to briefly explain the differences in the performance of stepper and servo motors.

The whole secret is in overload. A stepper motor has a torque depending on the current flowing through the windings. This current is given by the driver. If the torque is exceeded, the engine “misses steps”, and the controller does not know about it and the machine continues to destroy the material. To prevent this from happening, the stepper motor should be loaded with a torque not exceeding 50% of the rated torque at the given revolutions..

The servo motor works differently. It analyzes the position error with great frequency, i.e. the difference between the set position and the current one (e.g. from a measuring ruler). The microprocessor in the controller tries to control the torque, i.e. the motor current, so that the position error is as small as possible. Due to the fact that the current overload of servo drives reaches ten times the nominal value, the perceived power of a machine equipped with servo drives of a size similar to stepper motors is many times greater.