Thursday, Nov 26, 2009 at 09:42
Hi Member #1
""oldtrack,.....Frequency makes it draw more amps????...frequency changes its core material?????.....running slower makes it draw more amps???...i dont agree!!!
a motor has a rated FLA at any speed...and thats its maximum...not any more as then thats when overheating begins to occur......incidently a device designed to run specifically on 110v cannot be used on 240V""
Equipment designed for 60cycle has less iron in the ,be it motors or transformers etc
Iron core acts as a choke on ac .Higher freq less current lower freq more current .
Differance in amount of ironis not so noticable with equipment designed for small differances , but becomes vary obviouswith say a transformer designed for 25cycle to one for 50 cycle
A 25 cycle transformer used on 50 cycle will not have the output [lower , cannot draw same current
Use a 50 cycle transformer on 25 Cycle & it will have a very high manetizing current [standby]l & limited output before overheating.
In the case of motor it's not the running slower that makes it draw more curent ,it is the same as for transformers less iron lower freq more current. Differance between 50& 60cycle is small [16%] & mayl only be a problem if the motor is required to run @ it's max designed capacity,HP in old terms [will draw more than it's rated ,running slower less efficient cooling from fan.
Of course correct equipment can only be used on voltage it is designed for , my point is the need to make sure The transformer was 50 cycle & 240>110v not yank 220 > 110 60 cycle
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