NEMA 23 steppers July 12, 2014 06:45PM |
Registered: 11 years ago Posts: 60 |
Re: NEMA 23 steppers July 12, 2014 07:15PM |
Registered: 10 years ago Posts: 979 |
Re: NEMA 23 steppers July 12, 2014 07:24PM |
Registered: 11 years ago Posts: 60 |
Re: NEMA 23 steppers July 12, 2014 07:28PM |
Registered: 10 years ago Posts: 979 |
Re: NEMA 23 steppers July 12, 2014 09:02PM |
Registered: 9 years ago Posts: 28 |
Re: NEMA 23 steppers July 14, 2014 05:04PM |
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Re: NEMA 23 steppers July 15, 2014 01:14AM |
Registered: 12 years ago Posts: 29 |
Re: NEMA 23 steppers July 15, 2014 06:42AM |
Registered: 13 years ago Posts: 7,616 |
Quote
vulcanrd
Just make sure that the NEMA 23s don't require a lot more amperage than the Pololus can output .
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Re: NEMA 23 steppers July 15, 2014 06:44AM |
Registered: 9 years ago Posts: 210 |
Re: NEMA 23 steppers July 16, 2014 12:48AM |
Registered: 11 years ago Posts: 41 |
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Traumflug
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vulcanrd
Just make sure that the NEMA 23s don't require a lot more amperage than the Pololus can output .
Steppers don't "require" amperage. A stepper designed for 3A works with 0.5A just fine. You won't get the specified toque, of course, but half the torque of a strong motor might be more than full torque of a smaller one. And running steppers at less than the maximum current safely avoids them to get hot, of course.
Re: NEMA 23 steppers July 16, 2014 07:24AM |
Registered: 13 years ago Posts: 7,616 |
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Jim Fong
I had a 4amp nema23 that I was testing and was running rough. It wasn't until I bumped up the current to about 1.5 amps did it start to run smooth.
Quote
Jim Fong
There is detent torque and mass of the rotor that may affect the running of the stepper at very low current. Friction in the bearings??
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Re: NEMA 23 steppers July 16, 2014 08:48AM |
Registered: 11 years ago Posts: 41 |
Quote
Traumflug
Quote
Jim Fong
I had a 4amp nema23 that I was testing and was running rough. It wasn't until I bumped up the current to about 1.5 amps did it start to run smooth.
Most likely a problem of the stepper driver: [hydraraptor.blogspot.de]
Quote
Jim Fong
There is detent torque and mass of the rotor that may affect the running of the stepper at very low current. Friction in the bearings??
Friction in ball bearings is neglibile. Mass has a role when accelerating, only. Mass of typical carriages is 10 times higher than the rotational mass inside the stepper, though.
Re: NEMA 23 steppers July 16, 2014 07:27PM |
Registered: 12 years ago Posts: 29 |
Re: NEMA 23 steppers July 17, 2014 04:36AM |
Registered: 13 years ago Posts: 7,616 |
Quote
Jim Fong
Telling someone that all nema23 motors will run at .5amps may not be necessary true.
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Re: NEMA 23 steppers July 17, 2014 07:30AM |
Registered: 11 years ago Posts: 41 |
Quote
Traumflug
Quote
Jim Fong
Telling someone that all nema23 motors will run at .5amps may not be necessary true.
It is. Driver limits are not a motor limit. And running into driver limits gives the same result independent of the size of the motor connected. NEMA17 steppers would behave just the same. Accordingly you can say that a particular driver is not capable of running at low currents, but not point the finger at the stepper motor.
That said, even with some microsteps not taking effect, the motor still moves. A microstep not taking effect is joined with the next one, so you don't even experience overall step losses.
Re: NEMA 23 steppers July 17, 2014 01:53PM |
Registered: 13 years ago Posts: 7,616 |
Quote
Jim Fong
Some will, some won't.
Generation 7 Electronics | Teacup Firmware | RepRap DIY |
Re: NEMA 23 steppers November 17, 2014 12:38PM |
Registered: 9 years ago Posts: 121 |