DC drive or AC drive?

[kingjoey]

What are the an advantages/disadvantages of using a DC drive/DC motor combination vs. a sensorless vector AC drive/AC motor combination?

I have a choice to use either combination on a system we are upgrading. Can anyone offer any opinions or advice?

Thanks,
Joey.

 

[aolalde]

DC should be more expensive and with higher maintenanance.

DC will provide higher torque, if the application demands such.
What are the HP,speed and cycle of the application?

 

[jraef]

Below 2HP, DC is going to be less expensive in most cases.
Any other comparison requires more information about the application.

"Venditori de oleum-vipera non vigere excordis populi"

 

[jbartos]

Suggestion: I concur with the previous posting that more information is needed, e.g. motor size, application description, voltage level, kind of power supply and its availability, etc.