gear motor to use as dynamo

[gtemp]

Good morning to all,
I need your help.
I have a 24 vdc engine of 800 w power that moves a door through a screw-magnet system.
in the absence of power, I must use a dynamo that directly feeds this engine.
as dynamo I thought I would use an epicycloidal motor always at 24 vdc, on whose tree, I will connect a handwheel.
my question is, in order to be able to carry the gear motor (300 rpm) do I have to utlize for dynamo an engine of the same power?
or can I use a motor with a lower power?
available for clarification.
thanks in advance for the help.

 

[Fulvio Romano]

if the engine has to generate 800w, the dynamo will have to give it 800w divided the engine transmission performance. and the hand will have to provide such power divided again for the performance of the reducer, hoping that it is reversible.

Are you sure you manage to generate more than 800w? Why a dynamo? Isn't an ups enough?

 

[meccanicamg]

Technically considering that you are working in continuous current and I deduce that if you generate less power you will get less current at equal voltage, you will get less torque, therefore less useful electrical handling force.
so you have to manage something that is quite close to the nominal power, hand-off or even better with continuity group