Advice on these steppers -Nema 24 Stepper Motor 24HS34-3008D

**CharlieRam** · 08-03-2019

Hello All, I'm back again and still haven't finished my machine! Anyway, I'm just looking to purchase the steppers and came across these:-

https://www.ebay.co.uk/itm/Dual-Shaf...QAAOSwHu5b5ADz

They look almost identical spec to the 3.1Nm ones currently on CNC4You that I saw recommended elsewhere, well all apart from the Voltage?
https://www.cnc4you.co.uk/Stepper-Mo...YGH301B-Nema23

It says voltage of 24-48 volts in the spec but my Toroidal power supply should be around 70v when I actually assemble it. Are they a different motor and therefore not suitable?

Cheers,

Charlie

**m_c** · 09-03-2019

Going by the key spec (current and inductance), they are pretty much identical motors.
However I'd say 70V is too high. The recommended max voltage is 32 * SQRT(L) (L is inductance), which puts the recommended max voltage around 57VDC when running with parallel/unipolar wiring.

A higher voltage won't have much effect at lower speeds, however if you're running at higher speeds, overheating is likely to become an issue if running at the rated current.

**CharlieRam** · 09-03-2019

Thanks for the reply, I probably should of said I plan on connecting them in series so the max voltage works out at 114v given the above formula unless there is a reason not to connect in series🤔

Cheers

Charlie

**m_c** · 09-03-2019

You'll get better performance for any given voltage using parallel.

Inductance is the killer of performance, which is why you normally want steppers with as low an inductance as possible.

**CharlieRam** · 09-03-2019

Am I looking at this all wrong? I'm thinking of getting the EM806 or AM882 80v drivers, I have a 2 x 25v toroidal transformer and 4700mf 100v caps and rectifier to build the PSU which should deliver 68v, I am scratching my head at what stepper motors I should get to match the Power supply....if those 3.1Nm steppers only require 57v would I be better to go for 50v drivers and a smaller PSU?

**Clive S** · 09-03-2019

Originally Posted by CharlieRam

Am I looking at this all wrong? I'm thinking of getting the EM806 or AM882 80v drivers, I have a 2 x 25v toroidal transformer and 4700mf 100v caps and rectifier to build the PSU which should deliver 68v, I am scratching my head at what stepper motors I should get to match the Power supply....if those 3.1Nm steppers only require 57v would I be better to go for 50v drivers and a smaller PSU?

Personally I would go with the 68V p/s with the drives above or https://www.ebay.co.uk/itm/2DM860H-2...frcectupt=true

There are plenty of people using this setup without problems

**CharlieRam** · 09-03-2019

Clive, Are you saying the 57v rated Steppers will be fine with the 68V PSU and either of those drivers? I am sure this is what people have used in the past but m_c says the voltage is too high! I'm a little confused now.

Originally Posted by Clive S

Personally I would go with the 68V p/s with the drives above or https://www.ebay.co.uk/itm/2DM860H-2...frcectupt=true

There are plenty of people using this setup without problems

I saw those drives but was a little unsure....have many people used them? It doesn't look like it has stall detection although I do understand that if the motor has stalled the job will be wrong even with stall detect.

**CharlieRam** · 18-03-2019

Originally Posted by Clive S

Personally I would go with the 68V p/s with the drives above or https://www.ebay.co.uk/itm/2DM860H-2...frcectupt=true

There are plenty of people using this setup without problems

I was just looking at those drives and tried to search for ones in the european union to avoid any duty but are these fake? it says the max voltage on the drive is only 70v DC!
https://www.ebay.co.uk/itm/Stepper-M...EAAOSwyHxcfEjv