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Re: stepper motor NEMA 17 speed

May 29, 2013, 5:53 pm
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Forget about RPM, thats from the old days when we used DC motors on the extruder. With stepper driven extruders we command a given length of extrusion, which is simpler and gives better quality than the old method of setting an extruder speed and moving the head to keep up with that.

The E codes in the gcode tell the extruder how much to extrude. All you need to do is calibration your E steps per mm so that when commanded to extrude 1mm of filament, the extruder takes in 1mm of filament.
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Anyone had been worked with nmb stepper pm35s-048

June 5, 2013, 6:06 pm
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Hi Again


Does Anybody did worked with nmb stepper pm35s-048 and which circuit test without PIC had been used for it?

thx
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Stepper Motor Spin

June 7, 2013, 5:10 am
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Hello,

This is my first time on this forum. I am building a Prusa Mendel. I have my x and y axis working. However, for my extruder, I tell it to extrude 5 mm, it spins in one direction. When I extrude 5 mm again, the motor spins in the opposite direction. I am facing similar problems with my Z axis. Any insight would be greatly appreciated!
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Short shaft stepper motors

June 7, 2013, 10:25 am
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Does anyone know a good source for stepper motors with a short shaft? The project I am working on needs slightly shorter shaft length than the standard 24mm. Something like 15mm would be ideal.

There are ways for me design around that, but it really is going to make everything a pain.
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Re: problem with hammering noise in stepper motor and not moving X-axis

June 10, 2013, 7:19 am
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Pez,

Did a second power supply solve your problem? I'm having a similar hammering and rotation issue with my motors and looking for a solution. I'm running a 20A power supply right now which should be fine.

Thanks.
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driver for stepper motors

June 11, 2013, 9:45 pm
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I have stepper motors with the following specs:

200 steps per revolution (1.8 deg/step)
2 Phase bipolar 4 wires
Rated Voltage 2V DC
Rated Current 1.2A
Phase Resistance: 1.7 Ohm ± 10% (20º C)
Phase inductance: 4.5 mH ± 20% (1kHz 1 V rms)
Holding torque: 0.4 N.m Min. (40.0 N·cm)
Shaft diameter: 5mm / 0.188" (3/16")
Shaft length: 22mm
Motor depth: 40mm

Since they are such low voltage, which stepper motor drivers should I use? Should I go with the low voltage DRV8834?
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I have stepper motor on 230V and Arduino with Ramps 1.4

June 12, 2013, 1:56 am
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Hello,

I have only two stepper motor on 230V and Arduino 1.4.
I want to control only two motor...X and Y axis. I can it through with relays???
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Re: driver for stepper motors

June 12, 2013, 3:03 am
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All RepRap controllers do current chopping, so having a low specified voltage is not only possible, but actually advised. I have steppers specified for 1.53 V running on a Gen7 with A4983 based Pololus. Today I'd choose at least A4988 based drivers.
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Re: I have stepper motor on 230V and Arduino with Ramps 1.4

June 12, 2013, 4:29 am
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I have never heard of stepper motors needing 230V and no you can't drive them with relays. Motors used for reprap are typically about 2V.
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Re: Anyone had been worked with nmb stepper pm35s-048

June 12, 2013, 11:23 am
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It has been done before, yes. Have you tried using Google?
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Re: I have stepper motor on 230V and Arduino with Ramps 1.4

June 12, 2013, 1:24 pm
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... I have steppers with 325V and 3 phases, but they need special drivers ... but could be controlled by RAMPS with TTL outputs.

Have you an image of the motors? - could be brushless (synchrone) motors, had some too for 60, 110 or 220 VAC
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Re: I have stepper motor on 230V and Arduino with Ramps 1.4

June 12, 2013, 1:33 pm
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325V? Won't they be really slow due to massive inductance? You would need thousands of volts to get them moving quickly.
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Re: I have stepper motor on 230V and Arduino with Ramps 1.4

June 12, 2013, 2:41 pm
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Hi Chris,

the motors can be reconfigured by the driver for fullstep counts of 200, 400, 500, 800 or 1000 steps per revolution with max. 20kHz or with 10x microstepping then for 2000 to 10000 s/r with 200kHz max -- so same max. speeds in full- or microstepping ...
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Re: I have stepper motor on 230V and Arduino with Ramps 1.4

June 12, 2013, 3:27 pm
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But is 325V the DC rating of the coils, or the forcing voltage from a constant current driver?
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Re: I have stepper motor on 230V and Arduino with Ramps 1.4

June 12, 2013, 10:59 pm
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Hi Chris,

the drivers are specified with voltage outputs to the motors of 325V -- should be same as with common choppers, the initial voltage is set to max for higher torque and then reduced accordingly to the predefined sense current. The resulting voltage graph should read a starting spike and then settling to the 'holding' voltage ... can post the datasheet specs of the drivers when at home again ...
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Re: I have stepper motor on 230V and Arduino with Ramps 1.4

June 13, 2013, 12:49 am
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Hi Chris,

found the relevant datas in another of my forum-posts - the motors are the VRDM 397 W (have one VRDM 3910 W too):

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Re: I have stepper motor on 230V and Arduino with Ramps 1.4

June 13, 2013, 3:51 am
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According to the datasheet the winding resistance is 6.5R and the current 1.75A, so they are actually 11V motors driven from a 325V supply.

I don't think I have seen a stepper motor with a DC rating more than 24V. There isn't much point in putting lots of thin wire in the coils as it makes the inductance high. Better to fill the same space with less turns of thicker wire. The only down side is more I2R losses in the drive circuit.
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Re: I have stepper motor on 230V and Arduino with Ramps 1.4

June 13, 2013, 4:29 am
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... the controllers are driven from line with 230VAC -- AFAIK the 325VDC are the initial voltage peak to spped up the energitizing of the coils, then the voltage is reduced for the 1.75Amps sensing/regulating.

Only so they can achieve until 20kHz stepping frequenzies in full-step and until 200kHz when microstepping.

In my Isel are motors specified with 1 to 2 Volts, but the drivers 'charges' them with a peak voltage of 70 Volts before regulating to the set current ...
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Re: Nema 17 not beefy enough need help with driver selection

June 13, 2013, 12:19 pm
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My level of electronics is very rusty but I think you could just add mosfet. It has 3 legs one is signal that when on tells power to flow trough the other two pins. They can easily go upto 8amps and will cost you around 2bucks a piece. You will need several but I don't know the specifics. You should think of them as an amplifier.


hope i helped a bit
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Stepper Motors at Liquidation Prices!

June 18, 2013, 3:46 pm
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Hey Everyone,

Just wanted to let you know about our new web store for Mach Motion Products. We've got an overstock of steppers and drives at the moment, and we are looking to free up some space in our warehouse. http://machmo.com/store/index.php

If you've got any questions about any of our products, feel free to ask! Thanks for your time,
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