modifica servo

[protomax]

Originalmente inviato da airship

ho trovato questo sistema, secondo voi ha senso?
ho capito che mi interrompe l'alimentazione del motore in caso di finecorsa, ma poi da lì torna indietro? dovrei provare;
che ne dite?



Setting limits for a endless turning servo
In some application it is nescessary to switch off the current of the servo-motor if a mechanical position is reached (ie elevation of the camera-rig or switching between landscape and portrait). The problem can be solved by using to switches on the mechanical positions to stop and two diodes to check the direction of the motor current. The switch has only to work in one direction of the turning. The other direction has not to be affected. This modification works on a standard servo and on a modified servo for endless turning.

The modification in the servo is easy to make. You need only these items:


2 Switches normally closed
2 Schottky-diodes (SB120 or 1N5817)
Cable as long you need

Open the housing of the servo to get a view to the motor and the electronic circuit. Replace one wire between the electronic circuit and the motor by two wires and lead them outside of the servo-housing. The length of these wires depends on the positions of the switches. Connect the switches and the diodes as shown in the picture. Each diode controls one direction of turning. The motor has to turn in the direction until the switch is pressed. If the motor turns further on the direction of the diodes is wrong. Turn the diode and check the other direction in the same way on the other switch.

To avoid a reduce of motor-power, the diodes should be Schottky-Diodes (1N5817).

Con questo risolvi il problema di fermare il motore ma lui non fara' mai il lavoro di un servo e cioe' il controllo proporzionale...

Qui c'e' da capire se tu devi :

1- avere il controllo proporzionale del servo.
2- se usi lo stesso moter del servo attaccato al tuo attuatore.
3- che tipo di posizionamento devi fare solo nel fondo corsa o anche fermo a meta'.

Qeusto e' quello che non risco a spiegarmi.

Quello che invece ho capito che il motore e' grosso 4A