Why are stepper motors used for robot joints instead of other motors?

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Why are stepper motors used for robot joints instead of other motors?

To understand my answer well you need to get the difference between a stepper motor and an ordinary dc/ac motor.

Let me give an example ,consider the motor of your fan(an ordinary motor),the only control you have over it is of turning it on or off and changing its speed. Now say you want to rotate the motor through one and a half revolution only, how do you do that?

Now take your printer(which uses a stepper motor). You want to take in the paper and take it out, now that requires a specific number of revolutions. What your stepper motor does is that it completes one revolution in steps. These steps can be from 2–10000(i.e. One revolution could be completed in 2 or 10000 steps).

Incase of joints in robots,cnc machines,etc you need accurate movements which calls for precision in the movement of motors hence stepper motor are used. They also make use of servo motors.

 

Cloudray Stepper Motor Series has set the standard for quality, reliability, and durability in stepping motors. The precision of our Torque Power motors is matched only by the dependability of their performance. All Torque Power motors are bi-directional and totally enclosed with permanently lubricated ball bearings for long-lasting, smooth operation.

Cloudray stepper motor series are widely used in medical instruments, robotics, 3D printers, extruders, laser cutters, engraving machine, textile equipment, packaging machinery, CNC machines, etc. nema 23 bipolar stepper motor for 3D printer and CNC
 
High Torque, High Precision and Long life is Cloudray's core advantages
Low vibration,Low heating, No loss of step
Fast Response,Better Acceleration Performance
Thanks to a robust design they can be selected for the harshest environments. Precise, open-loop, speed and position control can be achieved with the application of full step, half step, or microstepping electronics.
nema 23 bipolar stepper motor for 3D printer and CNC
Higher Resolution,Avoidance of Resonance Regions
Stepping angle is adjustable( rang in 18°±5%), 0.9 °stepper motor's stepping angle is smaller, fineness is higher and positioning is more accurate.Avoiding vibration,runs more smoothly and gets lower noise.
nema 23 bipolar stepper motor for 3D printer and CNC
Sturdy structure, extremely long life
High quality materials including bearings and shaft made in Japan
Robust assembly, high speed range, and exceptional performance in even the harshest environments make Cloudray Stepper Motors the perfect solution for demanding positioning applications.
nema 23 bipolar stepper motor for 3D printer and CNC
Short length and light weight allow them to be used in highly integrated systems
nema 23 bipolar stepper motor for 3D printer and CNCnema 23 bipolar stepper motor for 3D printer and CNCnema 23 bipolar stepper motor for 3D printer and CNC
Cloudray stepper motor factory video
Stepper motor application
Cloudray stepper motor and Stepping Motor Driver are widely used in engraving machine, cutting plotter, textile machine, 3D printer, medical devices,stage lighting equipment, robot, CNC machine, music fountain and other industrial automatic equipment.
nema 23 bipolar stepper motor for 3D printer and CNC
nema 23 bipolar stepper motor for 3D printer and CNC
nema 23 bipolar stepper motor for 3D printer and CNC

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