motor control

[johnjohn.gano]

help pleas....
I,m doing a project about conveyor and I,m having a problem on how to retract the motor once it push one item....

 

[mbarazeen]

can you explain bit more about what you really want to do with the motor?? is it driving the convayer and you want to reverse it? or to have a slow down etc?

 

[Dragon Tamer]

If you are trying to get the motor to change direction, here is a really simple circuit that can do that for you. You will need to create the trigger yourself because I don't know what the rest of you circuit looks like.

 

[mbarazeen]

If you are trying to get the motor to change direction, here is a really simple circuit that can do that for you. You will need to create the trigger yourself because I don't know what the rest of you circuit looks like.

what about if he is using AC motors?? or other types of DC with different field winding to controll the speed?

 

[Dragon Tamer]

I don't know, but AC motors are not popular because it is so hard to change their speeds. DC motors you just modify the input voltage

 

[Artificer]

Need to know up front: Line voltage, horsepower, AC/DC, variable speed?, 1vs3 phase if AC

For small DC servo applications, an "H" bridge and RS flip-flop is fine. Adjustable speed can be accomplished with variable input to the bridge.

High power DC applications, reverse the armature. H Bridge, transistors or contactors depending on horsepower. General practice is to keep a field at the same polarity to maintain the residual field in the motor iron. Works up to 5000 HP from personal experience.

For poly-phase AC, reverse two phases. For single phase, reverse start (and run) windings. Reversing conveyors is serious business; should have a "soft-start" controller at the minimum.

Please note that my references are from heavy industrial automation applications. 5 HP and less are considered small motors. If this is a very small installation, a large RC servo might well do the job.

I talk too much, don't I?..........