This is for a hydraulic power pack built in the UK but running on a Danish ship. I already know that 50Hz= 1500rpm for a 4 pole m/c and 60hz= 1800 rpm. Obviously a little less due to slip.
2006-11-12 02:15:36 · 10 answers · asked by The Grynner 1 in Science & Mathematics ➔ Engineering
RPM=120*FREQUENCY/P
RPM=120*50/4
RPM=1500 RPM.
now you want to run motor on 60 hz supply and others parameters same,then
Rpm=120*60/4
Rpm=120*15
Rpm=1800.
Rpm will be increased by 20 %.
If the 60 hz is permitted , then you will get 20 % more production.
We have lost production what we have expected as we are using 50 hz supply system and machine which we have procured having capacity based on 60 hz capacity!
2006-11-12 02:45:17 · answer #1 · answered by Anonymous · 0⤊ 0⤋
You are perfectly right that the motor would "try" and run at a synchronous speed of 1800 rpm, however, as the relative speed is roughly equal to the square of the power then then motor, if it was running at full load, would eventually pack in.
The easiest way to put this right is to install a variable speed drive unit in between the supply and the motor and then run it at 50HZ.
2006-11-14 08:06:24 · answer #2 · answered by Andy S 2 · 0⤊ 0⤋
I can think of four.
1 It will not run at synchronous speed
2 The power factor will change leading to an unbalanced circuit.
3 The phase angle will lag and will increase the watt-less current
4 You will have trouble with a transformer's vector group reference.
2006-11-14 22:31:44 · answer #3 · answered by Anonymous · 0⤊ 0⤋
I think you've more or less worked out the answer. Getting the motor to turn faster will produce a larger back e.m.f. so less current and less output power. I think it depends on the load whether the motor will cope. Try it and see. Can the mechanical parts withstand the higher speed?
2006-11-12 02:31:40 · answer #4 · answered by Anonymous · 0⤊ 1⤋
It will run also if your running 60 Hz the voltage will most likely be 460 V instead of 440. Its done all the time.
2006-11-12 02:34:42 · answer #5 · answered by Roadkill 6 · 0⤊ 1⤋
I agree with Andy S
2006-11-15 07:01:13 · answer #6 · answered by marslarky 2 · 0⤊ 0⤋
I expect it would run a bit faster but should work
2006-11-12 02:24:29 · answer #7 · answered by bwadsp 5 · 0⤊ 1⤋
yes. the cicuit board care of cycles per second.
2016-05-22 07:00:57 · answer #8 · answered by ? 4 · 0⤊ 0⤋
It would also run hotter but not so much as to be a problem.
2006-11-12 02:30:18 · answer #9 · answered by Anonymous · 0⤊ 1⤋
if speed is not critical, no harm done
2006-11-12 02:43:12 · answer #10 · answered by Dreamweaver 5 · 0⤊ 1⤋