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May 11 11:58pm PDT |
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Home » Peter Augenbergs » taking apart an NGM adjustable gap motor |
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PARENT PROFILE Peter Augenbergs |
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LINKED PROFILES Augenbergs, Peter MIT Solar Electric Ve... Tesseract |
ARTICLE
taking apart an NGM adjustable gap motor OCID cn00000410 |
LINKED CATEGORIES DC Brushless Motors Motors |
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taking apart an NGM adjustable gap motor by Peter Augenbergs created 4/2/2004 submitted 4/2/2004 04:58:11 PM first - get a flat, clean nonmetal surface to work on. you then need to remove the spindle nut using the spanner wrench that you used to tighten the lockring. this piece is usually on pretty tight. after you get this off, note that it has a boss on one side, this goes toward the inside, and touches only the inner race of the outer wheel bearing. then thread in the three long bolts into the hub on the bearing puller, and crank away at the 3/4" shaft to pull the rotor. keep in mind the magnetic field falls off with the square of the distancce, so after about and inch and a half, you should be able to pull the hub/rotor/puller assembly off by hand. the hard part is putting it back together. the hub/rotor assembly has 5 bearings, two deep-groove wheel bearings, two deep groove rotor bearings, and a thrust bearing that keeps the rotor away from the windings. there are also a couple spacers in there, and they keep the motor from destroying the bearings. the adjustable gap mechanism makes the rotor bearings slide on the spindle. the problem with this is that if there is any debris or anything, it leaves bad scratches on the spindle, effectively giving the spindle a larger OD, which made it hard to put back together (it took almost a week of talking to NGM, machine shop guys, etc.) we eventually sanded down the spindle with 400 grit until the high spots were gone and the bearings would fit. it was still a bitch, getting 5 bearings to all be concentric under a magnetic field.... 280 words | paugenbe
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| Related Content (3) | ||||
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| bearing stack form NGM adjustable gap Photo by Peter Augenbergs created 4/2/2003 submitted 4/2/2004 05:00:16 PM this is the bearing stack that comes out of the rotor/hub assembly after removing the snap ring and outer wheel bearing. | |
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| scratched spindle of NGM adjustable gap motor Photo by Peter Augenbergs created 4/2/2003 submitted 4/2/2004 05:02:04 PM the adjustable gap mechanism can be seen here. since the bearings slide on teh spindle, they produce gouges, making it vvery diffficult to reassemble. | |
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| NGM adjustable gap with rotor/hub assembly pulled Photo by Peter Augenbergs created 4/2/2003 submitted 4/2/2004 05:03:16 PM here is the inside of the NGM adjustable gap motor. dont take it apart if you dont have to. | |
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| close-up of magnet stuck to coils Photo by Kevin Pratt submitted 5/19/2003 This is a close up of the seperated magnet sitting on the coils. Sorry its a bit fuzzy, but you get the general idea. | |
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| magnet on coils Photo by Kevin Pratt submitted 5/19/2003 This is the magnet sitting on the coils. Its a bit fuzzy, but you get the general idea at least... | |
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| opened NGM motor Photo by Kevin Pratt submitted 5/19/2003 This is a picture of our (Principia's) NGM taken apart at FSGP Topeka, 2003. During the drag race we had a magnet come unglued, hence the dissasembly. | |
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