Why do industrial robots rarely use stepper motors?CNC Stepper Motor extruder motor

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Why do industrial robots rarely use stepper motors?CNC Stepper Motor extruder motor

Stepper motors are great for small and medium machines — and quite large ones, too. This router table, driven by stepper motors, will knock you over if you get in the way of its moving beam and not even notice.

Steppers are convenient because you know where the rotor is at all times, assuming it doesn’t miss a step, so no feedback is needed except for some means of finding a zero position. After that it’s a matter of counting. (Although, the router above has positional feedback as well.) But for high-power robots, the kind that assemble cars, stepper motors able to deliver enough torque are unfeasibly large, so they tend to use servo motors with a rotary encoder to count position. A servo motor can be made with any amount of torque, and it doesn’t have to be electric — hydraulic is often preferable. Hydraulic servos rotated the turrets and elevated the big guns on battleships quickly and accurately to a fraction of a degree. So far nobody has made a hydraulic stepper motor.

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