Need Help!- How large motors can be used on my drivers?

[jaru-eri]

I have bipolar drivers which can support 2.5 A. Does that mean that larger motors at 3 A will blow the chips or will they only run with lower torque?

And will unipolar motors run with lower torque if I connect them to bipolar drivers?

[feragto]

Originally Posted by jaru-eri I have bipolar drivers which can support 2.5 A. Does that mean that larger motors at 3 A will blow the chips or will they only run with lower torque? And will unipolar motors run with lower torque if I connect them to bipolar drivers?

UNIPOLAR GOES ONLY TO UNIPOLAR DRIVES . IF YOU HAVE A STEPER MOTOR WITH 8 WIRES THAT CAN YOU CONECTED ON UNIPOLAR DRIVER OR AT THE BIPOLAR DRIVER . UNIPOLAR CONECTION GIVE A SMALLER TORQUE AS A BIPOLAR CONECTION .
IF YOUR DRIVER DO NOT HAVE OVERLOAD PROTECTION IT CAN HAPPEND IF YOU DRIVE A MOTOR WITH BIGGERR TORQUE , THE MOTOR NEED A BIG CURRENT AND CAN DISTROY YOUR DRIVER .

[pminmo]

Originally Posted by jaru-eri I have bipolar drivers which can support 2.5 A. Does that mean that larger motors at 3 A will blow the chips or will they only run with lower torque? And will unipolar motors run with lower torque if I connect them to bipolar drivers?

1. You run the motors at 2.5A with less produced power.

2. The only "unipolar" motor is a 5 wire motor. 6 and 8 wire motors can be wired unipolar or bipolar. See http://pminmo.com/six-wire-motors for information on the implications, specifically watch the video.

[tnsmachines]

Someone can verify but assuming 220V input...P=VI...P=2.5*220...P=550W and 746W/hp so 3/4hp motor or 750W or .75KW motor. That's if I understand the question!

[pminmo]

Originally Posted by tnsmachines Someone can verify but assuming 220V input...P=VI...P=2.5*220...P=550W and 746W/hp so 3/4hp motor or 750W or .75KW motor. That's if I understand the question!

I doubt if the stepper is a 220V motor.... probably closer 5V coil....

[tnsmachines]

I knew that sounded too easy...still the concept is the same if you know the voltage right?

[pminmo]

Kind of as it's a static power rating, not how much actual power the motor will develop which will depend on the motor design and how it's driven.

[jaru-eri]

The steppers I have now is 6-wired unipolar full coiled connected to bipolar drivers. I can only run them very slow before they make an awful noise.

Will it be better for me to buy bipolar stepper motors, or should I try half coil connection or maybe go from 1/8 microstep to 1/4 microstep?

How much holding torque do I need on a router for wood carving? Will half coil connection give enough torque for that kind of machining?

[feragto]

Originally Posted by jaru-eri The steppers I have now is 6-wired unipolar full coiled connected to bipolar drivers. I can only run them very slow before they make an awful noise. Will it be better for me to buy bipolar stepper motors, or should I try half coil connection or maybe go from 1/8 microstep to 1/4 microstep? How much holding torque do I need on a router for wood carving? Will half coil connection give enough torque for that kind of machining?

UNIPOLAR STEPER MOTOR (IF THEY HAVE ONLY 6 WIRES) GO ONLY TO UNIPOLAR DRIVER (THAT IS A GOLDEN RULE) . WHEN YOU BY A UNIPOLAR DRIVE THEN CAN YOU "PLAY" WIOTH MICROSTEPING . UNIPOLAR MOTOR CONNECTED TO BIPOLAR DRIVER DO NOT WORK GOOD (IF YOU DO NOT HAVE LUCK YOU CAN DESTROY DRIWER AND MYBE A MOTOR) .

ABOUT TORQUE . IT IS NOT A RULE BUT I LIKE TO SAY "THE BIGGER IS ALWAYS BETTER" I DO NOT KNOW HOW BIG ROUTER DO YOU BUILD , HOW KIND OF GUIDING , . . . . , BUT IF YOU TAKE SOMETHING WITH TORQUE 2 Nm or a little bigger i think it will be enought (but still that is not a rule because i dio not nothing about your router) . if you make a mistake with your calculation about motor torque and the motor is to small you san connected motor thru wormgearbox or some other transmition .

[pminmo]

Originally Posted by jaru-eri The steppers I have now is 6-wired unipolar full coiled connected to bipolar drivers. I can only run them very slow before they make an awful noise. Will it be better for me to buy bipolar stepper motors, or should I try half coil connection or maybe go from 1/8 microstep to 1/4 microstep? How much holding torque do I need on a router for wood carving? Will half coil connection give enough torque for that kind of machining?

Sounds like your describing resonance. "awful noise"

Couple of points, if your using the name plate current setting for full coil thats a problem. i.e. if your motor is rated 3A unipolar, your full coil current is .707 * 3A. Point two, your slowness is because of the total coil inductance and the coil voltage to power supply ratio in all probability.

Your half coil low rpm torque is the same as the unipolar torque.

I'd try running half coil before I spent any money.

Power needed to do wood carving depends on the machine size, mechanics and how fast you want to go.

[amishx64]

Originally Posted by feragto UNIPOLAR STEPER MOTOR (IF THEY HAVE ONLY 6 WIRES) GO ONLY TO UNIPOLAR DRIVER (THAT IS A GOLDEN RULE).

I have to respectfully disagree. You may be thinking a 5 wire can only be unipolar, which would be true.

Here is the stepper. Connect the 4 wires (for Bipolar drive) to terminals 1, 3, 4, and 6. Just skip the center (common) leads.


Wiring diagram from pminmo.com attached.
http://pminmo.com/six-wire-motors