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Have to disagree - an inverter is not the best option!

A rotary convertor is by far a more time proven long lived repairable item.

 

With an inverter you get the bonus of variable speed control. This sounds great but unfortunately this has an inverse connection to the torque value in an ideal world; high speed high torque, low speed low torque. What good is that?

Edited by eldon
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Have to disagree - an inverter is not the best option!

A rotary convertor is by far a more time proven long lived repairable item.

 

With an inverter you get the bonus of variable speed control. This sounds great but unfortunately this has an inverse connection to the torque value in an ideal world; high speed high torque, low speed low torque. What good is that?

 

It is true that a rotary phase converter might be more servicable, but they are very costly to run, as its convertor motor has to run continuously which wastes energy, I would imagine the the energy cost would go a good way to paying for a replacement inverter over say a 10 year life span.

 

Having said that I have been running a 4kW TECO inverter, (stand-by power 20W) for over 8 years without fault, and it has stopped me burning out my machines motors several times (wireless overload protection). Also don't overlook an inverter is very compact (mine's about the size of a toaster), and typically have a whole host of other advantageous functions too.

 

Sorry of I've miss understood your statement about "inverse connection to the torque value" but I think what you've said is wrong, - (simplistically) a VFC induction motor will give you constant torque up to the rated speed, and then constant power above the rated speed. This is what you would want in most mechanical applications.

 

Some good examples here:

Drives Direct - Digital Phase Converters - Home Page

 

-and google...

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