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what does peek ampere mean? Answered

hey!
Well, I have a 36v500w motor which requires ~14A basically.
now i want to buy this controller:
http://www.aliexpress.com/item/Dual-Motor-Driver-Module-board-H-bridge-DC-MOSFET-IRF3205-3-36V-10A-Peak-30A/2035641966.html
which states
Dual Motor Driver Module board H-bridge DC MOSFET IRF3205 3-36V 10A Peak 30A

so it is above 10A and under the 30A
is it ok to constantly use it on 14A?

Discussions

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iceng

Best Answer 4 years ago

Peek is looking at the current with one eye .......

NOT REALLY just fun-ing you.

30A peak means that if you exceed 30A your driver will instantly get destroyed.

You can run the driver continuously ( forever ) at 10 amps.

Your motor only draws 14A when it is fully loaded, and under 5A at no-load.

When you pull more then 10A say 14A your driver starts heating up and depending on the design it will get too hot to work and fail in a few minutes or a couple of hours.

Go ahead and look at it with both eyes :-)

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seandogue

4 years ago

PeAk ampere would define the highest value of electrical current flow.

The info you'e provided above indicates a circuit made to deliver continuous current of up to 10A max, with the overhead available to support transient loads (inductive loads often look something like a short circuit momentarily upon powerup) up to 30A.

It is not designed to be operated at 14A continuous.

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benf3seandogue

Answer 4 years ago

I hoped that this would be the answer, so if i am to say, add more heat sinks would this allow me to use such a bord at 14A continuesly?

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icengbenf3

Answer 4 years ago

The more info you have the better.

I doubt you can improve heat-sinking but a strong fan may help.

And are you going to be running FULL LOAD 100% of the time ?

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icengseandogue

Answer 4 years ago

Ahem said that in so many words !

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seandogueiceng

Answer 4 years ago

Sorry ice. I saw the question and responded without reading anyone else's answers.

Benf3, no, afaik, if it's a 10A peak 30A, it really means it's designed for a ten amp continuous load MAX, with the ability to load instantaneous transients up to 30A max. Contact the mfg for truly authoritative clarification of their specs.

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icengseandogue

Answer 4 years ago

Most machines can draw ten times the no-load current at start-up.

Here I could only guess at that value.

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seandogueiceng

Answer 4 years ago

True enough, but many are restricted from excessive short-circuit current internally. And most have turn on times fast enough that the momentary short simply produces the max current and if they can't start, then you didn't specify a large enough supply in the first place.

<< 7 years in industrial processes designing and overseeing $100K+ test rigs that routinely used 100+ hp motors and other high transience circuits. Most also had to be explosion proof as well...

The standard back-o-napkin value for peak inductive loads is 135% of nominal.

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icengseandogue

Answer 4 years ago

I remember motors that size are immersed in huge tubes and push combustible heating gases across this country.

Though 30 - 50 hp sawmill setworks machines were my main inverter design back when SCRs were all there was and the DC power was a wall of four quadrant GE supplies.

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seandogueiceng

Answer 4 years ago

BTW, you ought to know by now I don't give a hoot for "best answer". I had hundreds at one time that I deleted in order to remove myself from the left wing popularity contest this site promotes in liue of accuracy.

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icengseandogue

Answer 4 years ago

You're a rare bird... I'm over four hundred and chasing Steve whose well past a thousand. Then it could be stress avoidance technique.

BTW that is what an eagle or albatross uses to signal the same turn :-)

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seandogueiceng

Answer 4 years ago

oh.,.. idk. I was head to head with Steve at one time, but whatever it's history and in the end I don't care fora variety of reasons. Bottom line is, Ibles' "best answer" is (in general) a popularity contest, not a true test of merit, accuracy, or otherwise.

I can't take credit for the rareness. That in the genes.