Re: [CAD_CAM_EDM_DRO]stepper is very hot

Shabbir:

Good-quality steppers normally have a 130° C. rating, up-to which no damage
should occur to the insulation nor magnets, inside. I read recently that a
"usual operating-temperature, when rated amperage is reached (but not
exceeded) is 90° C. This IS very hot to the touch (for Americans who never
did high-school chemistry, this is about 194°F !!!).

Modern bipolar-chopper stepper-drives will "cut-back" the steady-state
current (amperes) after a couple of seconds of no pulses to driver. The
popular Gecko drives (G201 and G210) drop back to only 33% of the "set
current". This will preclude much overheating.

I did not memorize how the Superior Electric chopper-drives (their "SS2000-"
series) handle steady-state (non-stepping) current, but I am GUESSING it is
similar. But I think this is ALSO "user-optional", at least on the Gecko
drives! The user can pull a jumper or two, and the current will then NOT
"drop back" to less than "set current". One must "know what he is doing"
with this stuff!

Also, if you have a way to measure DC current, make sure the DC current is
not being exceeded in operation (when stepping). You may have the drive "set
up wrong". The only way the poor motor can "tell you" is to start smoking,
and it has been shown in recent decades that smoking is not good for the
health.

Lotsa luck! I commend you for being brave enough to be so involved with a
field in which most conversation in that regard is in another language than
your own! It is difficult enough when the language being used in one's OWN
(and even then, those composing the text haven't a clue how to properly DO
that!)!!!

Jan Rowland, Troll


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