Hello to All,
I have a 3000lb capacity 12 volt DC winch used for taking my boat on and off its trailer, ie the motor has forward and reverse action via a remote by cable switch. Chinese made, several years old, but has had very little use.
Recently, the winch slowly died as the boat was being retrieved.
Being a retired mechanic, but with only basic auto electrical knowledge, I pulled the winch apart, expecting to find the brushes as the problem, but also thinking that did not tally with the little use it had been put to.
The problem turned out to be that one of the half moon magnets had become unglued, and was thereby attached firmly to the core. The brushes are OK.
I cleaned everything well after googling how that should and should not be done, glued the magnet in place (?) with high grade epoxy, reassembled the motor and hooked it up on the bench directly by its positive and negative leads to a 12 volt battery. So no relay or switch in the circuit.
It goes well, BUT... only if I give it a nudge to get started, and then it fairly flys.
So back to google, and while I found no direct reference to this, in reading and being reminded how these marvelous things work , I wonder if I have glued the magnet in back to front ? I have tried searching for "can DC motor magnet be glued in back to front?"
If I have by Murphys Law glued it in 180 degrees out,, I dont relish trying to get that magnet out again, as the epoxy I used is heavy duty. But maybe I could get the other one out and turn it around ? But then would I need to reverse the core/commutator to get the orientation of the whole unit as it originally was (which I think would mean Id have to drill and tap new end plate locating screwholes) ?
I did fortunately come across this forum which tells me there are a number of people in the world who know a lot about DC motors !
Hoping someone can fill in my large knowledge gaps.
Regards, Don in Australia
I have a 3000lb capacity 12 volt DC winch used for taking my boat on and off its trailer, ie the motor has forward and reverse action via a remote by cable switch. Chinese made, several years old, but has had very little use.
Recently, the winch slowly died as the boat was being retrieved.
Being a retired mechanic, but with only basic auto electrical knowledge, I pulled the winch apart, expecting to find the brushes as the problem, but also thinking that did not tally with the little use it had been put to.
The problem turned out to be that one of the half moon magnets had become unglued, and was thereby attached firmly to the core. The brushes are OK.
I cleaned everything well after googling how that should and should not be done, glued the magnet in place (?) with high grade epoxy, reassembled the motor and hooked it up on the bench directly by its positive and negative leads to a 12 volt battery. So no relay or switch in the circuit.
It goes well, BUT... only if I give it a nudge to get started, and then it fairly flys.
So back to google, and while I found no direct reference to this, in reading and being reminded how these marvelous things work , I wonder if I have glued the magnet in back to front ? I have tried searching for "can DC motor magnet be glued in back to front?"
If I have by Murphys Law glued it in 180 degrees out,, I dont relish trying to get that magnet out again, as the epoxy I used is heavy duty. But maybe I could get the other one out and turn it around ? But then would I need to reverse the core/commutator to get the orientation of the whole unit as it originally was (which I think would mean Id have to drill and tap new end plate locating screwholes) ?
I did fortunately come across this forum which tells me there are a number of people in the world who know a lot about DC motors !
Hoping someone can fill in my large knowledge gaps.
Regards, Don in Australia