Choose among the advantages of different motor types

Type Use Remark
DC drive (DC motors) Optimally for simple speed control simple, economically
Servo drive (ACservo motors , BLDC)  Optimally for fast positioning highly dynamic and complex
Stepping drives (Stepping motors) Optimally for medium-speed positioning strong, not quite as dynamic, economically
Closed loop stepping motor drives Optimally for fast positioning strong, more economical than servo
Linear motor Special case:
Optimally for highly dynamic linear positioning and high accuracy
highly dynamic and complex, and not so cheap

Selection guide for positioning drives

The main types of motors for positioning use are stepping and servo rotary motors. Both are permanent-magnet synchronous motors, ie they have the magnets on the rotor and the windings on the stator. Both are free of wear.

More and more now are increasingly used linear motors, also here as a step or servo motor. In the case of linear motors compared to rotating motor stator and rotor swapped. THe voltage supply is effected for the rotor. So you need a portable power chain in general.

Comparison servo motor vs. stepping motor

Feature Advantage for
Speed > 3000 rpm Servo motor
Torque > 10 Nm Servo motor
Motor size both are comparable
Amplifier size Stepper motor drive = ca. 1/2 servo motor drive
Price Complete stepper motor axis = ca. 1/2 servo axis
Considering some special cases
Synchronous motor running Stepping motor
Torque during motor stand still Stepping motor
Holding torque in position Stepping motor
No damage in blocking Stepping motor
Overcominmg of load surges Servo motor
Smoothness of Rotation Servo motor

For a more in-depth introduction to positioning drives, you will find here the text from the previous day "Stepper Motor Drives" from the VDW seminar series "Drive Technology in Practice".

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