460V/60Hz rating vs 400V/50Hz rating of a motor
460V/60Hz rating vs 400V/50Hz rating of a motor
(OP)
We order a 460V, 60Hz specs squirrel cage motor (12/7KW) at dual speed 1445/730 rpm. But the supplier delivers us instead of 400V, 50Hz (same KW, n rpm rating)motor.
The supplier explains that the 400V, 50Hz is just the equivalent of 460V, 60Hz rating.
Is it really safe to operate this motor at power supply of 460V and at 60Hz frequency, any advice. thanks.
The supplier explains that the 400V, 50Hz is just the equivalent of 460V, 60Hz rating.
Is it really safe to operate this motor at power supply of 460V and at 60Hz frequency, any advice. thanks.





RE: 460V/60Hz rating vs 400V/50Hz rating of a motor
BUT:
1445 is an RPM associated with a 4 pole 50Hz motor with a 3% slip. If you apply 60Hz to it it will spin at 1800RPM synch., 1746RPM slip. At that higher speed and the same torque, the motor shaft power will be higher, i.e. 14.4kW. This usually isn't much of a problem but mechanically, you want to make sure the components will not be damaged or that if it is on a centrifugal load the higher speed doesn't translate to requiring even more power than this. If so, or if the 1455RPM is critical, you may want to consider a VFD.
RE: 460V/60Hz rating vs 400V/50Hz rating of a motor
FAQ237-1224: Motors: Changing between a 50 and 60Hz supply.
RE: 460V/60Hz rating vs 400V/50Hz rating of a motor
You said
"We order a 460V, 60Hz specs squirrel cage motor (12/7KW) at dual speed 1445/730 rpm."
1445/730 RPM at 60 Hz ? It should be around 1750/875 RPM at 60 Hz.
Something wrong here. Could you please check up ?
* Women are like the police. They can have all the evidence in the world and yet they still want a confession - Chris Rock *
RE: 460V/60Hz rating vs 400V/50Hz rating of a motor
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: 460V/60Hz rating vs 400V/50Hz rating of a motor
Thanks Bill.
* Women are like the police. They can have all the evidence in the world and yet they still want a confession - Chris Rock *
RE: 460V/60Hz rating vs 400V/50Hz rating of a motor
RE: 460V/60Hz rating vs 400V/50Hz rating of a motor
Are we seeing red or green here ? LOL.
* Women are like the police. They can have all the evidence in the world and yet they still want a confession - Chris Rock *
RE: 460V/60Hz rating vs 400V/50Hz rating of a motor
As soon as I posted, I thought
"And what jraef said also".
Sincerly
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: 460V/60Hz rating vs 400V/50Hz rating of a motor
RE: 460V/60Hz rating vs 400V/50Hz rating of a motor
I was just showing off my "colorful" personality...
"wink, wink". (I haven't mastered the smileys yet)
* Women are like the police. They can have all the evidence in the world and yet they still want a confession - Chris Rock *
RE: 460V/60Hz rating vs 400V/50Hz rating of a motor
I'm so sick of reading that quote, can you change it now and then.
Kind regards
Roy
RE: 460V/60Hz rating vs 400V/50Hz rating of a motor
Umm... Let me see, how I can improve my "signature".
If I removed "Chris Rock", would that make you happy ?
* Women are like the police. They can have all the evidence in the world and yet they still want a confession - Chris Rock *
RE: 460V/60Hz rating vs 400V/50Hz rating of a motor
No, it's the "women are like police----" quote. Every time i see it, even though I know what it says I can't resist reading it again.
I guess that's my problem, not yours.
Cheers
Roy