POWER SUPPLY QUESTION FOR NEMA 23 3Nm. (425 oz.in)

[craig00747]

NEMA23 57BYGH8930 3Nm (425 oz.in)
High Torque Hybrid Stepping Motor
1.8 Degree Step Angle (200 Steps/revolution)
Current Rating 3 Amp/Coil
Bipolar Stepper Motor Drives
Voltage Rating 8.4 V
4 wires Red, Blue, Yellow and Green

Hello Gents

I just completed my first own design CNC router build. It has SBR type linear rails and SBR type ball screws on all 3 axis`s. Two stepper motors will be driving the Y-axis and one on the Z and X axis. Each stepper motor has its own driver.

The above mention stepper motor type, was purchased by me, back in 2014 and are brand new. This was going to be used to convert a X2 milling machine to CNC. Scrapped that project.

The Supplier supplied a 36 VDC 350W 10 Amp power supply, with these stepper motors and FMD2740A stepper motor drivers. These drivers are suitable for driving small and medium-sized phase current is less than 4 A 2-phase or 4 A-phase hybrid stepping motor. Voltage rating of these drivers is 12 to 50 VDC. Maximum drive current is 4 Amp.Recommend the user to use 24 V - 32 V DC Supply. This info was taken from the specs sheet.

The FMD2740A drivers seem to be old technology and I can`t find much info about them?

My previous router kit build, was supplied with WANTAI DQ542MA (4.2 Amp) and the required voltage supply, was 18 VDC -50 VDC. These drivers really performed well, with the Nema 23 smaller rating stepper motors.

Now, I have a difficult question to answer.

(1) Should I rather use a 36 VDC 350W 9.7 Amp power supply or a 48 VDC 400W 8 Amp power supply?

(2) There will be 4 X DQ542MA (4.2 A) stepper drivers, connected to the power supply.

(3) I have a 4th axis unit to use on this router and also an extra DQ542MA (4.2 A) stepper driver.

So it will be a total of 5 DQ542MA drivers, connected to the PSU, but only 4 will be used during the normal operation of a 3-axis machine.

I am new to this sort of hobby and don`t know much about the electronic side of it.

My logic tells me that the 48 VDC power supply would be better to use, with the DQ542MA stepper drivers? I could be wrong and am requesting help from you more experienced people.

Lastly, the Nema 23 (3Nm/425 oz.in) stepper motors have dual 8 mm diameter shafts and a handle/hand wheel may be fitted to the rear shaft.

The code number of these stepper motors is 57BYGH8930 and I found very little info about them. Just a 2014 label underneath the part code.

Do you agree about using a bigger PSU?

Regards

Craig

Similar Threads:

• Need help! NEMA 34 Power supply (transformers)
• power supply wattage for 4 nema 23
• Nema motor Power supply
• Power supply and Nema 17

[dazp1976]

Use 48V.
they're a little underwhelming at 36.

You may find you need 2 power supplies. 1 for X & Y and 1 for Z & A for example.
I've got similar on a Sieg X2 mill and used 2.

Many people these days use the 425oz/in+ motors on 60Vdc supplies and drivers now.

[craig00747]

Hello dazp1976

Thank you for your reply. I really appreciate it.

I will check online to see if the Supplier has got another 48 Volt PSU?

I understand and agree about using 2 power supplies. The Y-axis is the one which has 2 stepper motors and is "carrying the weight" of the X and Z axis.

I have got 2 x 36 Volt power supplies, somewhere in my very untidy workshop. LOL Will have to look for them.

I could possibly use one of the 36 Volt power supplies, to power the "A" - axis? This axis is only rotating a little 2" chuck. So its not really working hard at all.

Then use one 48 Volt PSU for the Y-axis and one 48 Volt PSU for the X and Z-axis? The Y-axis having 2 stepper motors.

If the Supplier is out of stock, then I`ll have to wait until they have stock again and this will take months, due to the lock down.

Regards

Craig