I have a 200 v 2.5 amp brushed dc motor that the field magnets had parted ways with the housing!

I will disassemble the motor and remove the magnets(they are JB welded in)

No need to remove any magnets.

To recap: Your magnets came loose "Parted ways within the housing". You JB Welded them back in but you're unsure of the proper orientation. If they are not properly oriented then yes, you have to remove them WITHOUT BREAKING THEM. I don't know how strong the JB Weld is.

I've had magnets break apart. When I tried to put them back together at the fracture they resisted going back together. Now; I don't know this for sure, but if two "South" magnets are attempted to be put back together I would imagine they would resist each other. If you put a "North" and a "South" together to make a longer magnet then that may be the issue. I'm talking about things WAY over my head. Remember, a North magnet end and a South magnet end will attract whereas two norths or two souths would repel. But you know that much about magnets. Your magnets are not designed with one longitudinal end North and the opposite end South. Rather, the clam shell of the magnets are magnetized to where you're looking at the end of the magnet and on one side of the C the north is pointed at the center of the housing while the south end is pointed outward. The other side of the housing is just the opposite.

EDIT: Like this

 

To recap: Your magnets came loose "Parted ways within the housing". You JB Welded them back in but you're unsure of the proper orientation. If they are not properly oriented then yes, you have to remove them WITHOUT BREAKING THEM. I don't know how strong the JB Weld is.

I've had magnets break apart. When I tried to put them back together at the fracture they resisted going back together. Now; I don't know this for sure, but if two "South" magnets are attempted to be put back together I would imagine they would resist each other. If you put a "North" and a "South" together to make a longer magnet then that may be the issue. I'm talking about things WAY over my head. Remember, a North magnet end and a South magnet end will attract whereas two norths or two souths would repel. But you know that much about magnets. Your magnets are not designed with one longitudinal end North and the opposite end South. Rather, the clam shell of the magnets are magnetized to where you're looking at the end of the magnet and on one side of the C the north is pointed at the center of the housing while the south end is pointed outward. The other side of the housing is just the opposite.

EDIT: Like this
View attachment 366899

Yes you are correct. The magnets when oriented correctly (I have two on each side)do repel each other so I am faced with an assembly issue. I don’t know if I need to fixture to assemble or I do have room to separate them 1/2 to 3/4 inches which reduces their repelling each other while the glue is drying. I didn’t see them when they were originally mounted so I don’t know if they were gapped or not.

 

A reasonable guess is that the contact point of two magnets would be centered at the midpoint of that armature laminations, to provide the maximum magnetic flux thru the armature . BUT it may work out that it would be the center of the gap between the two magnets should be in that cntered position. How closely do the opposite ends of the magnets align with the ends of the armature laminations?? THAT may be more important.
My observation with wound-field motors is that the ends of the laminations of field and armature are usually identical, or extremely close to identical. That might be a much better way to position the magnet pole elements.

 

A reasonable guess is that the contact point of two magnets would be centered at the midpoint of that armature laminations, to provide the maximum magnetic flux thru the armature . BUT it may work out that it would be the center of the gap between the two magnets should be in that cntered position. How closely do the opposite ends of the magnets align with the ends of the armature laminations?? THAT may be more important.
My observation with wound-field motors is that the ends of the laminations of field and armature are usually identical, or extremely close to identical. That might be a much better way to position the magnet pole elements.

 

The armature is 3.70 long and the magnets are 2.00 long each so there is a .15 overhang on each end. I have found that by using a temporary spacer between them it is manageable to adhere the magnets in place and end up with .40 overhang.

 

That seems reasonable. Please let us know how it works out.

 

That seems reasonable. Please let us know how it works out.

Thank you to all you guys who chimed in to help me fix my motor. The motor is running well and I am happy.
I can’t run it above 140v right now but at that voltage it was running at 1750 rpm and approximately 1.2 amps.. Can’t tell about torque but seems ok even at low speed.