Questions tagged [stepper-motor]

A stepper motor (or step motor) is a brushless DC electric motor that divides a full rotation into a number of equal steps. The motor's position can then be commanded to move and hold at one of these steps without any feedback sensor (an open-loop controller), as long as the motor is carefully sized to the application. (Wikipedia, 2014)

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9
votes
3answers
3k views

Can RC servo motors continually rotate?

I know that RC servo motors are designed for precise movement, rather than a D.C. motor's continual rotation. Are most RC servo motors limited to movement within one rotation or can they actually be ...
16
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5answers
27k views

How to detect when a stepper motor has stalled?

How can I detect when a stepper motor has stalled? A google search led me to some people who say that when the stepper motor stalls, the current spikes up, which is easily detectable with a Hall ...
9
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2answers
19k views

How to tell a stepper motor's position, or detect slippage

I am creating a CNC machine on a budget, using old motors out of printers/scanners/etc. I am limited to about 650mA for the whole system, so my fear is that when the cutting bit touches the material,...
8
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1answer
1k views

For servos, can it be implied that `Holding Torque = Operating Torque * 2` like with steppers?

I am following a guide that recommends using stepper motors and it has an approximate holding and operating torque. It says that if you don't know the operating torque, it is often half of the holding ...
5
votes
3answers
14k views

Torque in kg/cm?

I was looking up the motor parameters for some stepper motor where they listed the torque of the motor at different current/voltage but the torque they listed was in kg/cm. How is kg/cm even a ...
5
votes
1answer
4k views

Will wiring a unipolar stepper to a bipolar stepper driver decrease the holding torque?

I have read that you can wire a unipolar stepper to a bipolar driver, which I have, by ignoring the two extra wires. One concern I have is whether connecting a unipolar stepper to a bipolar driver ...
3
votes
2answers
558 views

Rotate (and stop) a large disk in very tiny increments

In a lab build I'm doing, I'm stuck at this problem, so I am fishing for suggestions. I'm creating a turn-table type setup where I need to make readings (with a nanotube-tip probe I've already ...