stepper motor

hello there =)

can some one know if this stepper motor good for my prusa

length 33mm
holding tourqe 22
vol 2.8
current 1.33
ohm 2.1
inductance 4.2
inertia 35
bi motor

thank you

It is smaller and the torque is lower than we normally use. The normal motors are 47mm long and the torque is 0.44Nm.

It might work with slightly less acceleration and extrusion speed but they will tend to run hotter, so not good if you have PLA brackets.

Edited 1 time(s). Last edit at 12/29/2011 03:09AM by nophead.

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hi

thanks

im trying to work with a smaller size nema 17 ' im trying to find the smallest configration yet with higher torque

im going to order around 50 pcs (0.9 deg) and it could be custom as well

could you please let me know what is the lowest torque recommended ?

i allso orderd a 100 oz stepper motor (1.8 deg ) for the extruder ( like MK7 extruder) dont want to use gears wheels .

could be a weight problem on the X axis with this 100 torque motor (0.45 kilo )

Any help is appreciated


happy new year

@Elidor: I think X and Y axis can work nicely with that motor if linear ball bearings are used. I'm using a 0.44Nm motor for a direct drive extruder @1.3A. Your choice is even better for the job (so hopefully you can drive it below 1A and keep everything cool).

But at any rate, I would not buy 50 pcs without doing a test build first.

Good luck,

misan

motors are picky as to what hardware they play well with. also weight,torque,pulses per second, resonance, voltage, and current play in this as well. i would suggest you stick with what the official reprap motor is unless you have advanced drivers with a chopper circuit.

thank you nophead james and misan

well nema 17 too big that is why im looking for an alternative the best option i found is 39 mm with 4.4 ncm

i think i could get more tourqe with custom winding

right now im using this stepper motor -

Frame Size: NEMA17
Step Angle: 1.8 degree
Voltage: 3.1V
Current: 2.3 A/phase ( i know more then the driver can give )
Resistance: 1.25Ohm/phase
Inductance: 1.8mH/phase
Holding torque: 70oz-in
Rotor inertia: 68g-cm2
Detent torque: 280g-cm
Number of wire leads: 4
Weight: 0.34 kg
Length: 48mm

and they are working great .

misan - i getting lots of complaints about the orca extruder and you are the only one that say that yours working fine

so i guess the motors that i have will work fine ? the only problem is that the 0.45 kilo of the 100 oz could be a problem ' maybe thats why maker not using a static extruder ???!!!!




happy new year

Quote
Elidor
> misan - i getting lots of complaints about the
> orca extruder and you are the only one that say
> that yours working fine
>
> so i guess the motors that i have will work fine ?
> the only problem is that the 0.45 kilo of the
> 100 oz could be a problem ' maybe thats why maker
> not using a static extruder ???!!!!

I'm not using mendel-parts hot-end but reprap-fab one. This may mean a difference. Anyway, please note that additional cooling is required on the Pololu or it will not work ok (it may extrude ok only a few millimeters though).

Having a heavier motor in the x-carriage will mean that more torque is needed for the same acceleration. But you can just reduce the max acceleration in your firmware configuration to compensate for that (only in case it causes you trouble). There is a Marlin adjustment tool that can test your hardware's max acceleration (I've read about it but I have not yet tested myself).

Happy New Year,

misan