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This question is to get general idea of servo and stepper motor.

Assume same power rating motor and same voltage rating two motors. Which are servo motor and stepper motor. Same gear ratio.

  • what is high torque motor?
  • what is high stall torque motor?
  • what is high holding torque motor?
  • which motor is big size?
  • what is high velocity motor?

Assume same size motors which are servo and stepper motor.

  • what is high power motor?
  • what is high torque motor?
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  • \$\begingroup\$ That’s like comparing MOSFETS to IGBT’s ! What Velocity, Gear Ratio , efficiency, position error, step resolution? Etc \$\endgroup\$ – Tony Stewart Sunnyskyguy EE75 May 27 '18 at 14:36
  • \$\begingroup\$ Same gear ratio and others can be vary \$\endgroup\$ – saji indra May 27 '18 at 14:40
  • \$\begingroup\$ This is something that can be experimented and observed. Tony has a good list of information that you should consider explaining. \$\endgroup\$ – KingDuken May 27 '18 at 14:45
  • \$\begingroup\$ In general, if the stepper motor and the servo motor are the same physical size you'd expect to see 10:1 to 100:1 more torque from the servo. You can investigate these to get an indication: teknic.com/products/clearpath-brushless-dc-servo-motors \$\endgroup\$ – Jack Creasey May 27 '18 at 15:38
  • \$\begingroup\$ simple answer : SERVO always wins , look at all advanced CNC machines and robotics . the only place where stepper is used is lower cost. \$\endgroup\$ – ElectronS May 27 '18 at 22:20
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A servo motor can be any type of motor that has a control and feedback system that provides precise precise control of angular or linear position, velocity and acceleration of a driven load. For a valid comparison of speed and torque operation range vs. motor mass and volume, it is necessary to consider specific types of servo motors. Feedback devices and their requirements must also be considered.

There are also more than one type of stepper motors. Specific types need to be considered for a valid comparison.

Motor power is torque multiplied by speed. Motor torque is proportional to motor volume. Motor speed is less closely related to motor volume. To some extent, a motor of a given mass and volume can be designed for a specific torque and a wide range of speeds. In this case, the power is determined by the selected speed.

The continuous torque capability is related to the method of removing heat due to losses in the motor. Most motors have a means for the motion of the rotor to move air through the interior and/or over the outer surface of the motor. The physical and design of the motor influence the heat removal capability and thus the continuous torque capability. Higher rotor speed generally means more effective heat removal and higher continuous torque capability.

Not every servo motor is designed to provide continuous, or long term holding torque. Providing continuous torque with no rotor motion may require special cooling provisions or a physically larger motor.

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