How can we get feedback from a nema stepper motor 34 stepper motor?
Normally, you trust it. There’s one position in the rotation that operates an index sensor, which you find at power up, and after that you keep track of its position by dead reckoning, counting pulses. Every time the rotation passes the index sensor you verify that it happens at the right step and correct the count as necessary, or go to an error state if the index doesn’t occur. But if the motor slips or skips steps on a regular basis there’s something wrong with your design specifications, and you probably either need to look carefully at your start/stop ramp algorithm, or use a motor with more torque.
You can also use a rotary encoder on the motor shaft, but they’re expensive and considered overkill. If you need a rotary encoder to tell you the position, why use a stepper motor at all? You might be better off to use a DC servo motor, which is typically faster and has more torque.
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