Re: [CAD_CAM_EDM_DRO] Re: Toroid transformer temperature

Thanks to all...... The power supply aspect is one area that many need
help with for CNC'd equipment on a budget. I am really suprised no one
has put together at least a Kit capable of delivering at least 15amps.
Well, I should add that no one has done it so it was affordable !

MicroKinetics is one of the few that make an assembly of a +5 and 36
volt "kit". It however is rated for 10 amps, and that leaves you buying
at least 2 for a three axis machine. Even then, the power distribution
is somewhat uneven, one transformer for one axis, and another for 2
axis...... That is why they stick in 3 units in their driverack.

They have a listed price of $180 each !!! That is a lot of bucks. I
was curious how they do it without the large capacitors everyone is
looking for ?

I might have found a good link for big caps... A friend is in the 3
phase converter biz. He said he can get me big caps pretty cheap. I like
the sound of that !

Again thanks for all the input. When I get to this next week, I'll let
you know if they were .447 amp or 4 am transformers !

Chris L


echnidna wrote:

>Most if not all modern winding wire is safe at a minimum 100C so the 80C quoted is a safe conservative estimate. Caudlet and I both used a reasonable approxiamation of 80C to avoid highly technical discussions that are heading off list.
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>Dave is absolutely correct about the technical procedure to establish mean temperatures of motors and transformers. The same procedures can be used to determine safe operating parameters for stepper (and other) motors if data sheets are not available.
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>When I have a little more free time I will do a post on how to accurately determine detent torque, holding torque and volts and amps for unknown stepper motors
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>Regards
>Bob Thomas
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