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Author Topic: stepper motor detent position  (Read 415 times)

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Offline z3ngewTopic starter

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stepper motor detent position
« on: June 05, 2013, 12:36:15 PM »
Hello everyone,
I know that stepper motors can rotate in discrete angle following a the fed control pulses, but i have a question, if the stepper motor is energized, the detent position of the rotor will be discrete also, or it may be located in between of 2 steps.

Thanks in advance,
z3ngew

Offline jkerns

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Re: stepper motor detent position
« Reply #1 on: June 05, 2013, 12:48:40 PM »
It will move and stay at discrete points. You can do full steps, half steps, or with some effort - microsteps.

http://en.wikipedia.org/wiki/Stepper_motor#Microstepping
I get paid to play with robots - can't beat that with a stick.

http://www.ltu.edu/engineering/mechanical/bachelor-science-robotics-engineering.asp

Offline z3ngewTopic starter

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Re: stepper motor detent position
« Reply #2 on: June 05, 2013, 12:52:54 PM »
I'm sry, i meant if the stepper motor is unenergized, its detent position will be discrete or not

Thanks,
z3ngew

Offline jwatte

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Re: stepper motor detent position
« Reply #3 on: June 05, 2013, 05:00:40 PM »
The rotor of a stepper motor is unanchored when not energized, and could be at any arbitrary position. Once the stepper becomes energized, it will "snap" to some particular step position.
I highly recommend taking one apart and looking at it. It's just a bunch of coils around a permanent magnet rotor with specifically shaped ends to give the "step positions." It works a lot like a brushless DC motor.

 


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