hot motors , how hot can they go

[dertsap]

im running my motors with gecko drivers ,the motors are 4 amp 3v , i have found that they got fairly warm when i ran them at 28v ,now i have connected a second supply in series and i m running at 56v and the motors get very hot after a while , i can touch them but i can t wrap my hand around them for long (hot) ,,everything is correct proper resistors and wiring ,
i am nearly 20 times the voltage so i can understand the heat

steppers get hot but what is roughly the failing temp of these things

[joecnc2006]

I have been told they are rated up to 200deg F.

[dertsap]

wow that is hot!
thanks
curt

[Oldmanandhistoy]

Hi,

My stepper are rated to 80 degrees C; running them at 50V and 4.6A which is near their max. They get so hot that I cannot touch them for more than a few seconds, but when I measured the temperature they were only 76 degrees C.

Hope this helps,

John

[KTP]

Be kinda carefull if your steppers use rare earth magnets (maybe even if they use regular magnets too?). Take a scrap rare earth magnet and heat it up in the oven, at maybe 250 F it will demagnitize (might be higher than that for some magnets, or maybe the one I tried was poor )

[epatsellis]

have you read mariss' white paper on stepper motors? Anything past about 20x the rated voltage just becomes heat. My experience is past 10x and the heat rises alot, and not linearly. why did you go from 28v to 56v? Was there performance issues at 28V?


erie

[BptRoadman]

If a motor is rated 100 C that sa hot motor. ( 212f ). If the motor has a name plate it should give all kinds of info about it's use. It will tell you how many times you can start and stop or what kind of insulation it has. Servo's are different because most rely on shaft rotation motors require rotation to keep air moving around them but servo's may hold position without moving ...nothing prevents you from cooling a motor with an external fan ..it is common for some manufactures to include an external fan located at the motors rear .

[dertsap]

Originally Posted by epatsellis why did you go from 28v to 56v? Was there performance issues at 28V? erie

speed was the issue ,the torque on the motors stand up much better at higher speeds then they did at the lower voltage , im going to monitor things and maybe use heatsinks with fans , the power supplies run at 24v or 28v each so if heat is to much problem then i can kick back to 48v , im preparing for a bigger aluminum built system so right now the issue is getting what i have to the optimum , i think that i will look at my local surplus store at temp sensors for the motors and drivers , then if things get too hot the system will shut down ,
thanks for the replies

bigger better or crash and burn

[pap]

it's a little known fact that motors actually run on smoke. if you let the smoke out, they don't run anymore ...

[pbunnstf]

Not sure about your motor, but most motors are rated at maximum winding temperature "hot spot" - not surface temperature. If you approach the rated temperature on the motor case - you are vastly over the limit.