Why are my motors so hot?

[HereinCS]

I'm running 42v through my system. I have a EZg540 set at 5K, yet my motor gets smoking hot, and one burned out. Am I putting too much voltage through them?

[eSilviu]

Originally Posted by HereinCS I'm running 42v through my system. I have a EZg540 set at 5K, yet my motor gets smoking hot, and one burned out. Am I putting too much voltage through them?

voltage will never create heat, current will!
So I think that you have set the current too high for that motors.
(It may be a resonance problem too, but I doubt)

[CNC Lurker]

Originally Posted by HereinCS I'm running 42v through my system. I have a EZg540 set at 5K, yet my motor gets smoking hot, and one burned out. Am I putting too much voltage through them?

What resistor is your stepper supposed to use? I'm using the CNCRourterparts kit, so the EZg540 is supposed to be set to 3.5.

[HereinCS]

I can't read the value on my EZg540....but I have it turned all the way counter clock wise and the measurement across pins 1 and 5 is 5kOhms.

[HereinCS]

My motor states 2A and measured 5ohms across each winding

[Spiv]

You need a 2k resistor across 1 and 5. That sets your current. The trimpots are only for adjusting low speed smoothness.

[HereinCS]

I have more than 2k, I have 5K of resistance. The pot is to adjust the EZg540, not the trim pot on the gecko.

[Spiv]

Ah, ok I see. Well at 5k it's limited by the drivers at 3.5A/phase (without idle reduction) which is why it's killing your motors. Across 1-5 you should be coming up with 2k when it's adjusted properly. There's a chance you might have a bad pot on the EZ, try turning it while hooked up to a meter to see if it changes.

[HereinCS]

I had it at 2k but the motor ran hot and fried. Then I noticed my other motor getting hot as well. So I turned up the pot to 5k and it still heated up.

The motor that fried did so during my calibration. It was making a ton of small steps, then died and triggered an estop function

[Spiv]

A warm motor is normal, but obviously we're talking about much more than that if it fried one of them. How long was it running before that happened?

-the adjustment (counterintuitive) goes the other way. Lower resistance means lower current output. Something is still wrong, but you should be able to set them at 1.5k or so without the motors getting warm for quite some time.

[HereinCS]

Thanks, maybe I had it back wards. I'll turn them all down to 1.5k.

But the motor was running for about 20 minutes. Taking very small steps.

[Fastest1]

It is not a random number to adjust to. Why are you now selecting 1.5?