60Hz Filter Flo on 50Hz

[Chetlaham]

Known for a while that a lot of standards existed, but seeing the list still makes me go wow. Then again I am not surprised, there are so many pros and cons to both high and low frequencies. Higher frequencies mean less flicker and less iron, while lower frequencies equal lower transmission losses and more favorable induction motors. All in all 50/60 is just a compromise adjusted for metric standards. FWIW I once calculated the ideal hypothetical frequency at 72Hz. But chances are as solid state advances 50 years from now everything might be headed toward DC.

 

[tolivac]

Keep in mind higher frequency induction motors are smaller and lighter-and can run at higher speeds.This is common in aircraft applications.IE a 2HP 400Hz motor is about the size of two large fists placed end to end.I saw this motor in a fighter aircraft-used to drive the planes 20mm nose rotary cannon.Now we all know how big a 60Hz 2 hp motor would be.Not practical for this use.And the planes generator would be larger and heavier as well.And these motors can be more efficient than their 60hz counterparts.BUT 400 hz and other higher frequency power supplies don't transmit well over long distance like 50-60Hz or the 16-25 Hz would.Think AC will be around for a long time-DC doesn't transmit well unless synchronous convertors and rectifiers are used-this is EXPENSIVE.And with SS its easy to rectify whatever frequency of power you are using.

 

[combo52]

Reply # 6

When you lower the voltage on an induction motor the motor will run HOTTER and draw more amps, so it would be better to run the motor closer to its rated voltage of 120 volts.

 

John L.

 

[cuffs054]

Does anyone have pics of old residential Euro electrical systems/equip?

 

[Chetlaham]

"When you lower the voltage on an induction motor the motor will run HOTTER and draw more amps, so it would be better to run the motor closer to its rated voltage of 120 volts."

That depend on several variables. Near its rated load and at 60Hz that would be correct. But at 50Hz, the risk of saturation can be greater warranting a reduction especially if the supply is likely to reach is upper voltage bandwidth.

 

[Chetlaham]

*its upper

sorry for the spelling errors.