Motor Voltage Rating Problem

[SArsalan]

Hi
I am faced by bit of a problem. I am doing a project where the voltage available to me is 415V AC. There are a few motors that need to be installed. The pump motors have a voltage range from 380-415V so i guess they are ok. But some motors i ordered are being provided assuming a 400V supply. The biggest of them is a 15kW 3~ Motor. There is no VSD requirement. I know that the motor would run with the 400 V supply but what i don't know is will this affect the performance of the motor (it will be in operation 24/7). I have checked, the torque and maximum power is not an issue but as the supplied voltage is greater what effect will it have on the coils and is there any chance of damage.
I don't know the service Factor of the motor; do i need that to answer this question??
Also what will be the effect if the situation was completely opposite that is running a 415 V motor on 380 V?? It will draw more current but what limit of low voltage is allowable for operation?

Actually my field is instrumentation; so i don't have much knowledge about motors. Any help would be appreciated.

 

[Smart $]

Can't say because I'm not familiar with the standards the motors are manufactured under. But FWIW, NEMA (basically a U.S. standards org) -maufactured motors have a nameplate voltage below typical nominal voltage sytems here in the U.S. For example, a motor typically manufactured to be connected to a 480V supply system is listed at 460V.

 

[Besoeker]

Hi
I am faced by bit of a problem. I am doing a project where the voltage available to me is 415V AC. There are a few motors that need to be installed. The pump motors have a voltage range from 380-415V so i guess they are ok. But some motors i ordered are being provided assuming a 400V supply. The biggest of them is a 15kW 3~ Motor. There is no VSD requirement. I know that the motor would run with the 400 V supply but what i don't know is will this affect the performance of the motor (it will be in operation 24/7). I have checked, the torque and maximum power is not an issue but as the supplied voltage is greater what effect will it have on the coils and is there any chance of damage.
I don't know the service Factor of the motor; do i need that to answer this question??
Also what will be the effect if the situation was completely opposite that is running a 415 V motor on 380 V?? It will draw more current but what limit of low voltage is allowable for operation?

Actually my field is instrumentation; so i don't have much knowledge about motors. Any help would be appreciated.

I don't know where the installation is but the voltages you mention suggest Europe or one of the colonial/ex-colonial territories.
Voltage was "harmonised" at 400/230V. Not a lot changed in terms of local voltages ranging from 380V to 415V. Tolerances were expanded.
Most equipment, motors included are designed to accommodate the range of voltages.

On your last point about running a 415 V motor on 380 V, there is no one size fits all answer.
If the motor in question is running at full rated power the the reduction in voltage would increase current. Off that point it gets just a wee bit more complicated.
Reduce voltage and you reduce magnetising losses but increase rotor current and losses.