[siebiscuit]

I purchased three of the stepper motors shown below because at the time they were an amazing deal. I need to find a compatible power supply and drivers. I was looking at the gecko units but wasn't sure if the G540 can handle this on it's own or if I'll need to get individual drivers for each motor. Also, I read that the motor can be wired three different ways (again see below). What is best (bipolar series, bipolar parallel, or unipolar). Sorry for such a dumb question. I just want to machine wood. I have the Cad/Cam experience just need a working machine. Thanks in advance to all.

Kollmorgen P22NRXB-LNF-NS-00 Stepper Motor, Flat Shaft, 214 oz-in, 2.3 A DC, 200 Full Steps/Revolution, 1.8° Step Angle, -20°C to +40°C Operating Temperature
Kollmorgen P22NRXB-LNF-NS-00 Stepper Motor, Flat Shaft, 214 oz-in, 2.3 A DC, 200 Full Steps/Revolution, 1.8° Step Angle, -20°C to +40°C Operating Temperature: Amazon.com: Industrial & Scientific
This Kollmorgen P22NRXB-LNF-NS-00 Powermax II stepper motor is a 2-phase National Electrical Manufacturers Association (NEMA) 23 electronic component motor with 214 oz.-in. holding torque. This brushless, maintenance-free stepper motor has oversized 30-mm bearings to provide up to 10,000 hours of bearing life and extend the life of the motor. The stepper motor is equipped with an integral connector. The leads can be wired as bipolar series, bipolar parallel, or unipolar. The stepper motor is UL Recognized and CE compliant.

Specifications for model P22NRXB-LNF-NS-00
Frame size	NEMA 23
Phases	2
Length option	2 stacks
Termination	Integral Connector
Winding type	B
Full step	1.8 degrees ±3.0%/200 steps per revolution
Maximum shaft load rating (radial/axial)	20 lb. @ shaft center/13 lb. toward motor
Thermal resistance	4.5 degrees C per watt
Insulation	NEMA Class B, 130 degrees C
Insulation resistance	100 megaohms at 500 VDC, 25 degrees C
Shaft dimensions	0.25 x 0.81 inches/6.35 x 20.60 mm (Dia. x L)
Overall length	3.10 inches/78.7 mm
Weight	2.5 lb.

Part Number	Shaft Modification	Rotor Inertia (oz-in-s2)	Holding Torque (oz-in)	Current (A), Bipolar Series	Resistance (ohms), Bipolar Series	Inductance (mH), Bipolar Series
P22NRXB-LNF-NS-00 (this model)	Flat	0.0036	214	2.3	1.52	8.4

[ger21]

You want to run them bipolar parallel, where they are rated at 46 amps, and have an inductance of 2.1mH.

Gecko G201 or G203, or Leadshine Digital drives will run them well.

For a router, though, these are on the small side.

[siebiscuit]

Thanks for your feedback. This is my first machine so if I can just understand the basics while I ***** about the performance, on the inside, I'd be quite happy. As far as power supply goes, if the inductance is 2.1mH, I should use a ~45V power supply correct?Again, sorry for being so dense but what total amperage would you recommend? Would you mind pointing me to a product that will work well. I've heard so much about linear non-switching power supplies and I'm certain I'd get the specs right, but electrical setup wrong. Thanks again.

[louieatienza]

You should be fine. G540 handles up to 50VDC (I'd run 48VDC) and 3.5A max (again I'd run it just a tad lower.) The G540 also has 4 drives and it's own breakout board so a parallel cable from your computer (buy a cheap $10 parallel port card) to the G540 and a PSU is all you really need on the electronics side.

Whether to run unipolar, bipolar series, or bipolar parallel.... If you choose a G540 you cannot run in unipolar. You'd need something like HobbyCNC (which you need to solder together yourself.) Bipolar series gives you more low end torque but less top end speed, while bipolar parallel gives you more top end speed at the cost of less low end torque. Normally you'd go series because the motors will run cooler. I'd also tend to go series if you're using coarser pitch screws and parallel for finer pitch screws... but a lot will depend on how you design your machine...

[siebiscuit]

Thanks for your feedback. This is my first machine so if I can just understand the basics while I ***** about the performance, on the inside, I'd be quite happy. As far as power supply goes, if the inductance is 2.1mH, I should use a ~45V power supply correct?Again, sorry for being so dense but what total amperage would you recommend? Would you mind pointing me to a product that will work well. I've heard so much about linear non-switching power supplies and I'm certain I'd get the specs right, but electrical setup wrong. Thanks again.

Please see above question regarding amperage. Please advise..