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I am a weight weenie, I have to be as I have a limited amount of power to play with. I love one piece cans as it is the lightest way to make a motor, glueing endbells is fairly close as are threaded endbells, but neither are as reliable, screwed in endbells like these new ones add a considerable amount of weight as well as adding something else to go wrong.
Without any mechanical gubbins in the endbell a 1 piece can can offer much better cooling, you can see in the pictures the 1 piece can has more cooling holes and those holes are also much larger.
It is possible to make a 1 piece can shorter for the same size rotor, so those with limited space may be able to fit a more powerful motor in.
Obviously there is a lot less material wastage and a lot less machining time in a 2 piece can compared to a 1 piece can reducing production costs. Cheaper manufacturing is all well and good as if the price is held static could lead to better materials being used eg thinner stronger alloys to save weight, thinner stator laminations for higher efficiency, higher grade Neodyimium for more torque, to fund R&D for better motors in the future, or it could be used to cut retail costs and ease our wallets. However I would expect them to make a big deal of any of those improvements to their retailers like Steven, and he mentioned none so I suspect it was done to increase their profit margins at our expense.
This is not always the case with 2 piece cans, but with these specific motors if you look at the pics in the first post, the bearing in the 2 piece can in the wrong way around for us boaters. It is good for cars (where the motors are aimed) as it is impossible for the bearing to fall out should the bearing retainer fail as it is trapped between the endbell and the rotor or shims, and they all have gear drives so no end loads trying to move the bearings. You can see the 1 piece can has an external bearing pocket so flexshaft users that take the thrust at the motor have the can supporting the front bearing so it can't move, but the 2 piece can has an internal bearing pocket, so the thrust is trying to break the bearing retainer free, push the front bearing out, squish the shims/rotor resulting in lots of friction and heat, and pop the backplate off and/or back bearing out.
Kinda off topic, I have a few NeuMotors (all fairly old and one piece, I didn't know they had changed), and I was thinking about getting a couple of 11 series, but the neumotors.com site seems to have transgressed into an early '90s text only 56k site and runs like I have a 9600 baud modem, and the Neumotors page on Castle's site where Neu sent me for my last couple of purchases is down, are they still in buisness? Is it just my PC? Are the new 11 series no longer 1 piece too? Anyone know where I can get one, OSE doesn't carry the 11 series.
Without any mechanical gubbins in the endbell a 1 piece can can offer much better cooling, you can see in the pictures the 1 piece can has more cooling holes and those holes are also much larger.
It is possible to make a 1 piece can shorter for the same size rotor, so those with limited space may be able to fit a more powerful motor in.
Obviously there is a lot less material wastage and a lot less machining time in a 2 piece can compared to a 1 piece can reducing production costs. Cheaper manufacturing is all well and good as if the price is held static could lead to better materials being used eg thinner stronger alloys to save weight, thinner stator laminations for higher efficiency, higher grade Neodyimium for more torque, to fund R&D for better motors in the future, or it could be used to cut retail costs and ease our wallets. However I would expect them to make a big deal of any of those improvements to their retailers like Steven, and he mentioned none so I suspect it was done to increase their profit margins at our expense.
This is not always the case with 2 piece cans, but with these specific motors if you look at the pics in the first post, the bearing in the 2 piece can in the wrong way around for us boaters. It is good for cars (where the motors are aimed) as it is impossible for the bearing to fall out should the bearing retainer fail as it is trapped between the endbell and the rotor or shims, and they all have gear drives so no end loads trying to move the bearings. You can see the 1 piece can has an external bearing pocket so flexshaft users that take the thrust at the motor have the can supporting the front bearing so it can't move, but the 2 piece can has an internal bearing pocket, so the thrust is trying to break the bearing retainer free, push the front bearing out, squish the shims/rotor resulting in lots of friction and heat, and pop the backplate off and/or back bearing out.
Kinda off topic, I have a few NeuMotors (all fairly old and one piece, I didn't know they had changed), and I was thinking about getting a couple of 11 series, but the neumotors.com site seems to have transgressed into an early '90s text only 56k site and runs like I have a 9600 baud modem, and the Neumotors page on Castle's site where Neu sent me for my last couple of purchases is down, are they still in buisness? Is it just my PC? Are the new 11 series no longer 1 piece too? Anyone know where I can get one, OSE doesn't carry the 11 series.
Nortavlag Bulc 
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] have temporarily been housed in a (OMG) nonconforming 65mm can to allow car and plane winds to better fit some Y versions. I have requested the "boat winds" to be changed back to a shorter can soon to conform to the PPPP.*
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