50 Hz power supply

[alphabraxon]

i have customer running 50 hz power supply. Long story. No POCO available.
Any ideas how equipment shown to operate at 60 Hz will behave assuming we have the right voltage? E.g. drill marked 120V 60 Hz?

 

[templdl]

If you were referring to a universal motor with brushes it would run hotter.
I you are referring to an induction motor it would run hotter in addition to running slower.
I would not recommend anything that is marked specifically as 60hz be used on 50hz. In general motors that are designed to run on 50z will often time work satisfactorily on 60hz except that it would run faster.

 

[hillbilly1]

i have customer running 50 hz power supply. Long story. No POCO available.
Any ideas how equipment shown to operate at 60 Hz will behave assuming we have the right voltage? E.g. drill marked 120V 60 Hz?

Since there is no POCO, I am assuming that this is generator supplied, one possible solution would to be increasing the genset speed, while decreasing the voltage pot to keep the voltage at 120. Though there may not be enough range in either to accomplish this though, havn't done the calculations, but just a thought. Are all of the loads 60 Hz or is it a mixture?

 

[gar]

080511-2118 EST

alphabraxon:

Is this an ordinary hand drill, like Black & Decker, and with or without speed control?

An older B&D that I have is labeled AC-DC. It has no speed control and uses a universal motor. Meaning it is a series motor with a commutator.

A newer Sears drill with speed control is labeled AC only and 60 Hz. My guess is that it would basically work on 50 Hz, but the speed control would have a different characteristic transfer function. Meaning a given position of the speed control would give a different speed. This is still an AC-DC motor, but the speed control uses either SCRs or a Triac and you must go thru a current zero crossing to turn off the SCR or Triac. Turn off every 1/2 cycle is an important part of the operation of the speed control.

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