[How do I?] How do you reverse a non-reversable motor?

Monday at 9:32 PM
#9

Kernbigo said:
i could be wrong but if you remove the armature and reverse it in the winding it may work
You're not wrong. This will work, but it's important to make sure that the rotor bars align with the stator bars. It won't work with all motors, but I have been successful several times

Ted so why not try my idea not the hard to reverse the armature and end bells on the motor Kernbigo
 
Hey Greg and Ted, ya'll rock! I turned the rotor around and it worked like a charm.
The process is not that difficult. I pulled the end covers, put the rotor in in the opposite direction. I took some measurements and it looked like it might work. I then cut the wires to the starter side cover, being careful to leave enough wire on both sides . I then spliced in an additional foot for each wire. I then routed the wires to the other side. Then spliced the extensions to the relocated starter side cover. You need to be a little judicious with the final length of the wires. The most difficult part was trying off the wires so they would not rub moving parts. Then I put the rotor in, replaced the end covers and bolted everything back in place. It took about an hour. On my motor, the base was not centered, but was closer to the old pulley side, so I added an additional motor mount base for good measure. I would warn that those new wires may be somewhat detrimental to cooling, but I don't run a planer that long and I will be sure to leave the motor as open as possible.

Fabulous hack, it probably saved me four hundred bucks.
Thanks
Randy
 
Ted so why not try my idea not the hard to reverse the armature and end bells on the motor Kernbigo

If I understand things correctly as stated in this thread, he did do it your way. I was just confirming that you were not wrong about turning the rotor around in the stator. On some motors the rotor bars don't align axially with the stator bars when you do this and it can cause over heating and reduced performance.

Ted
 
Talvare, That was my experience. The output horsepower was downgraded by about 35 percent.
 
Thanks very much guys. I am going to give reversing the rotor a try. If it doesn't work, it's no big loss. But it is such a great hack, that I have to try it.
Figure eighting the belt might work, but I will be running 2 belts with a max distance of 24" between centers. I am afraid that they would rub. But I might be able to cock the motor off center a few degrees.
This is one reason this site is so great. Plenty of ideas that I might not have come up with myself.
Randy

You could try to extend the shaft out the other end and now it's running the right way and no risks taken with the motor. If you remove the shaft and drill then bore a nice hole in the end of the shaft, thread the hole, make sure it will be self tightening when running, Make your extension shaft and screw it in, your good to go. you may need to bore out the bearing end cap, if it's enclosed.
 
Swapping ends will not change the angle relationship between the rotor and the stator windings. It's like a piece of threaded rod, flipping it end for end doesn't make a right hand thread left handed. ;) If the rotor is not centered equally between the two end bells, it may change the position where the active part of the rotor sits in relation to the active part of the stator, that could be more of a problem.
 
Swapping ends will not change the angle relationship between the rotor and the stator windings. It's like a piece of threaded rod, flipping it end for end doesn't make a right hand thread left handed. ;) If the rotor is not centered equally between the two end bells, it may change the position where the active part of the rotor sits in relation to the active part of the stator, that could be more of a problem.

Centering is the real problem here, if it centres fine, if not don't do it, In which case the only way to reverse the directiion of that motor is, as I said before, to extend the shaft out the other end. and for anyone with a lathe not too difficult.
 
Centering is the real problem here, if it centres fine, if not don't do it, In which case the only way to reverse the directiion of that motor is, as I said before, to extend the shaft out the other end. and for anyone with a lathe not too difficult.

When we refer to centering it's magnetic centering we are refering too, not always the same as dimensional, be careful..
 
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