Re: [CAD_CAM_EDM_DRO] brushless servo...

Hello John

That�s means Bridge isn�t only amplifier. Actual construction include in it some rectifiers elements.

The differences between Bridge and Half-bridge is that in Bridge we use both of sides sinusoidal wave and in H-bridge there are remake only one side of this wave. (is that completly correct?) Is there are any other general differences?

This is general very often used bridge for controlling a Brushless motors:

http://www.mskennedy.com/media/documents/4357ri.pdf

http://www.allegromicro.com/sf/8904/



Regards.
Mat

Jon Elson <elson@...> wrote:
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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