Mateusz wrote:

>Hello 
>What is that exactlly BRIGGE and H-Bridge for brushless motrs ? 
>I have noticed that many company offer this component and i have 
>noticed this is used generally for variable speed only. 
>
Yes, in most cases the "power blocks" that are used mostly in VFDs could
also be used in a servo drive for brushless motors of either the permanent
magnet type or the induction type.

>Is this possible to buy H-brigde for brushless motors with revers-
>option (chenging revolute direction) ?
>  
>
All VFDs can also reverse the motor electronically.  What you may not know
is that there is no intelligence in the power block.  It just contains a 
rectifier
and 6 power transistors.  The major complexity of either a VFD or a servo
drive is the control logic that generates the signals to drive those 
transistors.

Jon



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