460V 60 Hz Motor Operating at 380 Volt 50 Hz

What is your application? What is the motor driving?

Torque remains the same, speed drops to 5/6 of rated, so therefore power drops to 5/6 because power (HP or kW) in a motor is an expression of torque at a given speed.

So if it is a pump, you will pump less.

If it is a fan, it will blow less.

If it is a conveyor, it will just move slower.

If it is a compressor, it will take longer to achieve pressure.

If it is a saw, it may not be the right speed for the blade teeth to function correctly.

If it is ... etc. etc. etc.

I assume it's just a motor, not a complete pump, fan etc. So as long as the machine it's fitted to in Europe draws power no more than ~ 5/6 x the US rating, at the 50 Hz speed, all should be well.

Also full-load current does not change.

Cheers..........Codey

What's the point of considering "just a motor" if it is not connected to anything? The point I (and Labyguy) was making was that the LOAD that is connected to the motor is where the real effects will be felt, and the TYPE of load makes all the difference. The OP did not provide enough information.

I wasn't suggesting the motor would remain unconnected to any load. I was trying to distinguish between

a) taking a complete unit - e.g. pump, fan etc with motor designed for 460V 60Hz, and connecting it to 380/50

b) fitting the motor to a load designed for 50 Hz speed, and connecting it to 380/50

From the original post, which only refers to the motor, b) seems more likely. If it's a), as you pointed out in #2, it depends on the type of equipment. For constant torque load, power drawn will be the reduced motor output power, and motor is being worked to its (new) maximum. So though the equipment performance is reduced, it's the best that can be done. But if it's e.g. a centrifugal pump, performance will be well down, pump shaft input power down to (5/6)³ = 58%, while motor output is 83%. OP would need to ensure the lower pump performance is acceptable, or it's all a waste of time.

Cheers............Codey

OK, I see your point, thanks for the clarification.

No problem JRaef.........Codey

460V 60HZ designed mean 7.66V/HZ. If you run the motor at 380V 50HZ, the V/HZ ratio would be 7.6V/HZ, the same. The torque would remain the same and no extra losses would generate but speed would be dropped.

Read this good artical

http://www.lmphotonics.com/motor_50Hz_60Hz.htm

The extra loss I referred to was cooling loss (of air flow) as speed is reduced. Not motor performance characteristics.