Question I plugged in a 6V motor on the USB port of my Laptop and suddenly my laptop becomes turns off. After turning on, that USB doesn't work except on mouse

Apr 16, 2021
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I plugged in a 6V motor on the USB port of my Laptop and suddenly my laptop turns off. After turning on, that USB is no loger working except only the mouse.

I reinstalled the USB driver, disabled the suspended power setting in power setting option but nothing happens. What to do now?
 

Paperdoc

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Yeah, both WHY? and HOW? A standard USB2 ports can supply power at 5 VDC up to a max of 0.5 A. It takes a very small motor to work that way, so I would not expect a device of any kind containing a motor to be wired to use a USB2 standard connection unless its current consumption is less than that. Or did OP rig up a custom connection?
 

Karadjgne

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You just tried to Jumpstart a car from a cellphone, based on the fact it has a battery. And you wonder why the phone is dead.

Motors see startup spikes in amperage, takes a huge amount of power to break the static lack of energy and supplement it with momentum. Even a motor designed to run at 0.2A can pull as much as 5x that amount easily, depending on the weight of the load being moved.

And you plugged in a 6v motor to a 5v port rated for upto either 500mA USB2 or 900mA if it's USB3.

I'm surprised there's no further damage done than a burned out port.
 

carocuore

Upstanding
Jan 24, 2021
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Hm, the scope of your engineering genius does knows bounds huh?

You have a motor that requires 6 volts and and a peak current of let's say 5A, your USB port not only has only 5 volts but also can only supply 10% of the current your motor needs.
This is why motor starters exist, to limit the amount of power it gets to them and mitigate spikes or inrush current (AC)
 

Paperdoc

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Connecting such a load to a USB2 port makes no sense at all IF you understand the limits of that port. Maybe OP did not know all that. What intrigued me, though, is that making a connection to such a port requires a device fitted with an appropriate connector. Without that, you should not be able to make such a connection and overload the port - that is one way the port is protected. I do NOT expect that ANY device maker would fit that type of motor with a USB2 type A connector. So again, how was this accomplished? Was OP author of his/her own disaster?
 

Paperdoc

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Unfortunately true. It requires MIS-use of the adapter, BUT as you say that is easy! Reminds me of a similar mistake that bugs me: people who figure if it has 4 pins and you can push it together hard enough to stick then it all should work. Its IS a 4-pin connector, after all!
 

Karadjgne

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Well the kicker is that you don't even need the molex. Many motors have pre-connected wiring, soldered to the housing, just a red and black wire. Not hard to snip off that molex and just tie black to black and the other, just 2 wires from that usb connector, 5v and ground. Could probably do that with the usb from a cell phone charge only cable too.

Either way it wasn't a well thought out plan, even if you didn't know the usb was only 5v and amperage weak, just assuming it's 12v like most things claim to be, hooked to a 6v motor would still be a disaster.

Somewhat lacking in sympathy here as I was raised to use the right tool for the job. A butter knife is a butter knife, not a screwdriver nor a pry-bar.
 

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