[moki]

I hope someone can help me! I have 2 stepper motors from an Epson Stylus Color 400 printer. The motors have 17PM-K212-P17 and P/N EM-257 on the label. I have visited the Minebea website. They list a 17PM-K249B bipolar motor in the pdf files. According to the website 17 is the size of motor, P is type of motor, M is the step angle, K is type of lamin, 2 is motor length, and 12 electrical variation. The website is :

Hybrid Stepping Motors - Custom-made

The Epson manual says: Drive Voltage - 42v. 7.8 ohms 4 phase /200 pole stepping motor. What is the current rating? Can I simply divide 42v by 7.8 oms? This will give me a current of 5.3A. Seems a little too high to me.

Will appreciate any help.

Thanks

[H500]

5.3a is definitely too high. I would guess 500ma for a motor that size, with that resistance.

[moki]

Thanks for the reply. Managed to find some info on the net. It is rated for 700mA. Now, will I have supply full 42v to achieve a current of 700mA?

[H500]

The voltage rating is suspicious, but 42 volts would be reasonably good regardless of its rating. Of course you should use a chopper drive, or you might burn out your motors. Keep in mind that those are very weak motors. For cnc, motors usually take 3-6 amps.

[moki]

Want to build a light machine for PCBs, plastic and maybe wood. Will try them out when I am ready. I will more than likely try and get unipolar motors. I am busy putting together a 3 axis controller from Chromationsystems.

[lw3eov]

Hi,

I've found different information on this stepper motor:

Nominal Voltage 7
Current 0.7
Resistance (Ohms) 10
Torque (in-oz) 44.4
Torque (kg*cm) 3.2
Wires 4
Steps / Revolution 200
Step Size (degrees) 1.8
NEMA frame size 17

EM-257 motor bipolar stepper generic Stepper with timing belt pulley

[rodw]

I think Minbea issue part numbers to manufacturers but you can get a pretty good match from their published data for the 17PM-K2 drivers at 0.6 and 0.8 amps.
The motor is good enough to handle 48 volts but really not very useful other than to give you something to play with to get to understand how steppers work. I had a similar one sitting beside me when I developed a rotary table controller on an arduino but used a NEMA 23 when I made the machine