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Other › Loose magnets in Century 650A+ 800kV
08-08-2011 04:08 AM  6 years agoPost 1
rwithey

rrNovice

Chehalis, WA - USA

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I did not have a good day....

Yesterday I got the new Century 650A+ 800kV motor installed in my Raptor 30v2 conversion. I had about a 3 minute test hover in the front yard and all seemed great. Today I went to the club flying field for some real testing since my yard is about the size of a driveway.

And that's were the trouble happened....

I just put her on the ground and then start spooling up for the first flight. Before the rotor even got up to speed there was an awful noise. Immediately I throttled off expecting a shredded tail belt or similar.

What I found was one of the magnets had a chunk missing!
I discovered I could use my finger nail and pull the magnet off the bell and pull it out of the fingers in the base of the bell. Only held in with the magnetism. I checked the other magnets and found a could pull a second magnet off the bell with only my finger nail and could pull it clear out of the base fingers as well.

No glue at all? If anything a VERY slight line off possibly CA glue.
Every motor I have had in the past had good heavy epoxy like glue holding the magnets in. Did I just get a bad motor? I bought it brand new from Heliproz South on Thursday. Do you think the small grind I did near the top of the shaft for the prop adapter set screw will void the warranty?

Any help would be appreciated. See pics for details.

Rob

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08-08-2011 04:38 AM  6 years agoPost 2
Heli 770

rrProfessor

USA.

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I remember when the Raptor E550/E620 first came out the OBL, Century and Z power motors needed the pinion placed on the bearing face to keep the shaft and can from lifting. At that time there were magnet problems because no one knew about using a retaining collar or keeping the pinion against the bearing inner race.

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08-08-2011 04:15 PM  6 years agoPost 3
rwithey

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Chehalis, WA - USA

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Thanks for the info. It would have been nice of Century to include that information on the specs sheet that came with the motor - or at least included a collar like the manufactures of every other motor I have purchased.

However, I am not sure that was the cause of my problem since the magnets are loose and no glue appears to have been used on at lease two magnets and the rest have no visible glue on them. I don't see how the can moving up and down a straight shaft could contact a magnet without the magnet coming loose first.

Rob

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08-08-2011 04:26 PM  6 years agoPost 4
Heli 770

rrProfessor

USA.

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I don't think any of the motors that I have mentioned gave warnings about retaining the shaft and in your case it's even worse because the motor is mounted with the mounting face up and all the weight is on the bottom. I would call Ron's and see what they can do for you.

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08-08-2011 04:37 PM  6 years agoPost 5
rwithey

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Chehalis, WA - USA

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I agree, none of my other motors came with a warning - however they did come with a collar installed or in the package - which implies it is needed. My assumption was since it was not included it was not needed. In retrospect it makes sense one should install a collar or have the pinion on the bearing face. However I still don't see how that would make a magnet or two come loose and strike the stator.

I will likely call Century first since they are on the west coast (as I am) so shipping should be cheaper and faster. Maybe they could just send me a replacement magnet to install with what ever glue they did or didn't use. Also, I bought the last motor Ron had in stock so there would be even more of a delay. If Century won't or can't help - I'm sure Ron will.

Thanks again,
Rob

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08-08-2011 11:45 PM  6 years agoPost 6
3Dmuse

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Ontario, Canada

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That's just poor manufacturing. Have it replaced.

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08-09-2011 06:42 PM  6 years agoPost 7
rwithey

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Chehalis, WA - USA

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Just got in touch with Paul at Century and an RMA# was issued.

Will send it out tomorrow.

Thanks guys,
Rob

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