hello, i've bought this pump from ebay(http://www.dhgate.com/product/rs-360sh-water-pump-dc-pump-suction-pump/113518946.html to see the datasheet), but i'm having some problems while trying to supply it. reading the documentation i noticed that while the pump starts uses a lot of corrent respect to a normal 5V power supply. what kind of PSU i have to buy to avoid problems? thanks in advance for your help!
It says a stall current of 8.6A at 7.2V, so I’d go for a supply at least capable of that.
but what means "stall"? because the ebay seller wrote in the description that the maximum power consunption was of 1.76A with water... very strange! I lost to write that the model of my pump is 2885(3-9V operating range). i post here the link of the ebay seller: http://www.ebay.it/itm/331158325030?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649 thanks a lot!
Stall means exactly that - when the rotor of the motor is held still, the stall current is what will be drawn.
yes, but in the datasheet result: 1,76A at maximun efficency 8.6A in stall. i don't understand what is the difference between maximum efficency and stall, excuse my ignorance, but is the first time that i have theese problems to supply a simple motor! thanks
Imagine that you specify a supply only for “peak efficiency”.
At start-up, your rotor is close to stall, so your supply voltage will dip massively, so your motor may not even start turning.
ok,thanks a lot!! so i've to buy a power supply like this: http://www.ebay.it/itm/H506-alimentatore-switching-5V-10A-50W-/291285397205?pt=IT_Stanza&hash=item43d1f66ed5 i'ts a 5v 10A psu and i think it's fine for my work... right?