Choosing correct motor for Delta

Scrambler73

Hello co-owners of a Duet3D,

I have a Tractus 3D printer, this is a Delta printer that has been upgraded with a Duet 2 Ethernet. I would like to discuss/advice what kind of motor I should mount.

I now use the standard motor what the Tractus3D used back then. I also know they don't mount these motors anymore for a long time (I don't know what they use now).
This is the specification: Casun (model: 42SHB0502-24B), 0,9 degrees, 1.68A.

There don't seems to be much information and this is al I can find.

The motor I wanna use are from Trinamic, model: QSH4218-47-040.
Click here for specification

The Trinamic has a low voltage (1.4V) and a very low Inductivity (0.6 mH). I prefer precision/accuracy and smooth finish above speed and time. So with 1.8 degrees it has a disadvantaged but I would like to use more micro stepping to match the steps per mm I have with the Casun. I also see that the Trinamic is optimized for microstep operation.
They also say they are a optimum fit for TMC236/TMC246 based driver circuits. I know the Ethernet uses the TMC2660 stepper drivers. I assume/hope that they also have a good fit for the drivers used on the Duet 2 Ethernet.

I think the Trinamics would be a good upgrade but I first wanna ask know if people here feel the same.

Also, the price of the Trinamic is not an issue. So if we can leave the price tag out of the discussion that would be great!

Danal

My immediate reaction is to stick with 0.9 motors. They literally, physically, have double the coil/magnet assemblies of a 1.8 motor. No amount of microstepping overcomes that for your stated goal of smoothness.

The question then becomes: Which motor 0.9 motor? I haven't done research in a couple of years and may not know of something new. When I built my large-ish custom delta, with Duet2, I chose these:

https://www.sparkfun.com/products/10846

They have been outstanding on my main "workhorse" printer. 600mm (24 inch) bed.

BFD Printer.jpeg

Phaedrux

https://duet3d.dozuki.com/Wiki/Choosing_and_connecting_stepper_motors

https://www.omc-stepperonline.com/nema-17-bipolar-0-9deg-46ncm-65-1oz-in-2a-2-8v-42x42x48mm-4-wires-full-d-cut-shaft.html

These motors pair quite nicely with the Duet 2. I use them on my CoreXY and I know several people are using them on deltas. They are often recommended for just that.

Electrical Specification
Manufacturer Part Number: 17HM19-2004S1
Motor Type: Bipolar Stepper
Step Angle: 0.9 deg
Holding Torque: 46Ncm(65.1oz.in)
Rated Current/phase: 2.0A
Voltage: 2.9V
Phase Resistance: 1.45ohms
Inductance: 4.0mH ± 20%(1KHz)
Physical Specification
Frame Size: 42 x 42mm
Body Length: 48mm
Shaft Diameter: Φ5mm
Shaft Length: 24mm
D-cut Length: 24mm
Number of Leads: 4
Lead Length: 500mm
Weight: 370g

For microstepping on the 2660 it is best to use x16 with interpolation to x256 enabled. This reduces the overhead on the CPU and still has the advantage of x256 smoothness and quietness since the driver sends a full 256 step pulses to the motor.

Using higher native microstepping on all axis is likely to result in a high hiccup count and possibly missed steps or even complete lockup. And honestly there is no benefit to doing so, especially if you're already using 0.9 degree motors. The one case where it may benefit is ungeared extruders with a low steps per mm.

wesc

I got significantly better layer stacking with my Delta with LDO steppers when i upgraded from OMC (same as ones linked above).

LDO datasheeet: https://cdn.shopify.com/s/files/1/0239/9287/files/LDO-42STH47-1684MAC_RevA_9f61050a-7275-4b98-a6c5-9f28bd0cb2b7.pdf?172

Filastruder carries them.

Phaedrux

@wesc That's cool. I've heard good things about LDO motors before.

Danal

Hmmm.... you guys are going to talk me into an upgrade... hmmm....

bartolomeus

@wesc said in Choosing correct motor for Delta:

I got significantly better layer stacking with my Delta with LDO steppers when i upgraded from OMC (same as ones linked above).

LDO datasheeet: https://cdn.shopify.com/s/files/1/0239/9287/files/LDO-42STH47-1684MAC_RevA_9f61050a-7275-4b98-a6c5-9f28bd0cb2b7.pdf?172

Filastruder carries them.

The specs of that motor are almost identical to the E3d high torque motor: https://e3d-online.dozuki.com/Document/wiwQjVSQdCLQT44I/MT-1704HSM168RE.pdf

Are Motech and LDO the same?

wesc

Are Motech and LDO the same?

Could very well be. or could be matched specs and China copying China. Motech and LDO are about 100km apart from each other in China.

lord binky

@Danal I use the same Motors on my Rostock max for years now and they've held up quite well for the abuse I did on them. I have looked for lower inductance / inertia 0.9 steppers with good torque but I haven't found one I'm confident will perform better for a decent price (I'm looking at you moons' industries...)

If you get a chance, test out my settings I scope tuned for the motors. Mine run 1500ma without getting hot and are as silent as I can expect of them.

https://forum.duet3d.com/topic/13028/my-tuned-tmc2660-settings/2

oarjjj

@lord-binky I have moons motors. They’re an old design, same as stepperonline and don’t run any better.

Maybe try Lin engineering if you’re looking to spend $50 per motor. Same company, totally different level of support and design. Lin has been around for a long time so lots of used ones out there.

lord binky

@oarjjj If I'm going to spend that on a motor i would rather get a set of smart steppers