Single phase 2.2Kw motor blowing fuses 2

[hydroman247]

I am not an electrical engineer so I am not familiar with these motors at all.

It is a single phase 240V AC motor. Rated 2.2KW. It has a 16A power feed with a 16A fuse but when the motor is loaded up, the fuse blows.

240V, 16A = ~3.8KW
How is it possible for the motor to draw over 2.2KW or is that not really a set limit, just a limit the motor should not be used above?
I know this is probably really basic but I have no idea.

Thanks.

 

[Skogsgurra]

It is called overload. Have you tried reduce the mechanical load? Does it work then?

Also, if the power factor is around 0.7 you cannot get more power oout of the shaft than 3.8*.7=2.7 kW. Then, there are other things to consider also. I don't find it mysterious at all.

Gunnar Englund

http://www.gke.org

--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.

 

[jraef]

You likely don't know this, but an electric motor is a "dumb animal" in that it will "try" to accelerate, or re-accelerate, a load regardless of it's size. So if you connect too much load to it (as Skogsgura said), the motor ATTEMPTS to accelerate it back to it's design speed, but if it cannot, it pulls too much current in the attempt, the current causes excessive heat and it eventually catches fire in the attempt. The fuses intervene to prevent that fire.

"Will work for (the memory of) salami"

 

[waross]

If the original dual element fuses are replaced with basic "code" fuses the fuses will blow every time the motor is started.

Bill
--------------------
"Why not the best?"
Jimmy Carter

 

[hydroman247]

You likely don't know this, but an electric motor is a "dumb animal" in that it will "try" to accelerate, or re-accelerate, a load regardless of it's size.

Ah ok. The motor works fine under no load. I have found another motor that is the same apart from the fuse inside is 20A rather than 16A so that was probably someone elses solution/bodge. I also forgot about the power factor with AC so thanks Skogsgurra.

Thanks for the help. We will have to be more careful loading this motor up.