Electronics > Projects, Designs, and Technical Stuff
Stepper motor specs and drivers
slowpoke:
I'm trying to use a stepper motor and no idea if i can use this driver.
So, i have 57BYG007-04A motor (nema23 size, round, not your typical square), which is rated to 12V and only 0.38A.
Coils measure at 58ohm.
The driver i hope to use is DM556 with lowest setting of 1.4A.
Most motors i dealt with in the past were nema17 3v and 1-2.5A rated and i could drive them with this driver.
Thats what puzzles me. High voltage rating and low amps in a BIG motor...
Do i dare try ?
Paul Moir:
0.38A (4.5W) is probably the continuous rating. The thing is you're not going to drive it continuously at .38A; you'll either switch it off or use some less current to hold it in position. The idle current on your driver should be less than .38A and, over time, the average current going into the stepper should not exceed 0.38A or the motor will get too hot and may burn out. But you will need to drive it harder to get it to move fast and as long as you're not overheating it or going ridiculously high everything will be just fine.
PS - they lately decommissioned the slowpoke reactor near me. Sad.
slowpoke:
This motor, hopefully will run rotary attachment for laser cutter.
Its just that i only have this motor and this driver to hand.
Can i run the pair ? Motor 12v 0.38A, driver lowest setting 1.4A. Dont care if i blow motor, but i wouldnt want to blow the driver.
Here's where i pulled the info on motor (mine is 57BYG007-04):
http://www.stepmd.com/reference/57BYG.htm
#Edit1# Oh, and the laser cutter motor power supply is 24V. Driver rated 20-50V
Paul Moir:
Yes, the driver current is in peak and the motor current is in average. Driving with 5x the average current is not a lot. The DM556 is coy about what its idle (holding) current is set to but if it's not burning out NEMA 17s then it can't be much.
Think of the stepper as a resistor; it'll be fine unless you get it too hot. But you can't be insane and drop 10s of amps through the windings either even if only for a split second or it'll fail in another way.
Nominal Animal:
The motor voltage rating is just a nominal figure, and basically tells you the minimum voltage you need to get maximum torque out of it.
The 0.38A stated looks like the maximum RMS current (so 0.54A peak) the motor can continuously operate at, without burning up.
It looks like an unipolar motor (6 wires), similar to this one. These are often run from Darlington arrays (something like ULN2002A), not via H-bridges or proper stepper controllers.
If the black and white wires (or any pair of the six wires) are shorted, you cannot use the DM556 controller, because then the stepper cannot be used in bipolar (4-wire) configuration. If they are not shorted, then you can use stepper in bipolar mode, and the DM556 controller in software configured current mode (SW1:OFF, SW2:OFF, SW3:OFF), with the controller set (using the Windows ProTuner software) to use 0.5A, and SW4:OFF (so standstill current is halved), and preferably microstepping (4 or more microsteps). Even then the motor may overheat eventually.
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