BMC hub - 30-second error fixed in 3 weeks

snowranger

snowranger

10 kW
Joined
Sep 2, 2008
Messages
653
Location
Fog City, CA
I've been running my hub since September in rain and shine. I suspect that it is getting a bit noisier. Are there any maintenance procedures for these motors?
 
Hope you got a better price on that one.
 
If the Puma you are describing is the geared hub motor sold by Mark at teamhybrid in the UK, I have disassembled a motor purchased from EVTECH that is a fairly similar. I changed out the phase and hall wires on my 400W BMC rear hub motor to 14 gauge phase/24 gauge hall teflon (PTFE) insulated wires to make it somewhat closer in spec to Mark's Puma. I disassembled the motor far enough to get at the hall sensor circuit board within. The pictures and description can be found in the following link.

viewtopic.php?f=6&t=5596

-- Joey in Albuquerque
 
It looks like I am in the market for replacement gears after 1300 miles at 48V/30A. Look at this:

144n.jpg


Anyone know if the new composite gears for V2 will work in the 400W V1 version and where to source? I'd also settle for 2 nylon and one steel I guess.

Are those torx screws securing the gears and what kind of grease is in there. Thanks.
 
Bump. Anyone out there?
 
BMC USA told me that the V1 and V2 gears are the same size. The composite ones will work in the V1 but will be noisier. Seems okay to me as long as it doesn't break.
 
This is off Google Maps

Brushless Motor Corporation‎Address:
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20447 Nordhoff St
Chatsworth, CA 91311

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Knuckles has gears for those motors in the US, I believe!
otherDoc
 
Thanks. No response from Knuckles, but cycle9 is working on it. Those new composite gears look promising.
 
Not sure. I thought it was some sort of plastic impregnated with metal.
 
Not sure if they are the same as the Puma gears. But I ordered 2 extra nylon gears from Mark (team hybrid) with my last order, so I am pretty sure he has some. If you are despreate PM me.
 
I've just had some metal gears made for bmc motor ( pic below)
stig you could use a grinder to take off that extra portion on the axle, no need to remove whole axle!
unfortunately supplier sent me with wider axle for some reason, and was some time constraints to get the motor sent out,
this sort of thing happens all the time. ( also had some metal bafang gears made up in pic)
pumagear.jpg
 
snowranger said:
It looks like I am in the market for replacement gears after 1300 miles at 48V/30A. Look at this:

144n.jpg


Anyone know if the new composite gears for V2 will work in the 400W V1 version and where to source? I'd also settle for 2 nylon and one steel I guess.

Are those torx screws securing the gears and what kind of grease is in there. Thanks.
Click to expand...

I am in the process of trying to obtain the composite gears directly from BMC for Snowranger. I will get some extras in stock, and have them available. I will post again as soon as I have them in hand.

Just a note, I think that 30A at 48V is too much for the V1 motor. The max power I would recommend for the V1 motor is around 1,000W (i.e. 48V at 20A). They are not designed for more than that..... But for people using them within that range, we've not had any reports of blown gears yet...


Morgan
cycle9.com
 
I opened up the V1 and V2 side by side tonight to compare gears. Both are same size... but the V1 gears are white nylon (like in your picture), and the V2 gears are green, presumably the composite (though BMC has not been forthcoming on exactly what the composite is). It would be interesting to do some destructive testing on both, but right now I can't afford to do that....

Wiring in the V2 is also beefier.

Morgan
 
cycle9 said:
snowranger said:
It looks like I am in the market for replacement gears after 1300 miles at 48V/30A. Look at this:



Anyone know if the new composite gears for V2 will work in the 400W V1 version and where to source? I'd also settle for 2 nylon and one steel I guess.

Are those torx screws securing the gears and what kind of grease is in there. Thanks.
Click to expand...

I am in the process of trying to obtain the composite gears directly from BMC for Snowranger. I will get some extras in stock, and have them available. I will post again as soon as I have them in hand.

Just a note, I think that 30A at 48V is too much for the V1 motor. The max power I would recommend for the V1 motor is around 1,000W (i.e. 48V at 20A). They are not designed for more than that..... But for people using them within that range, we've not had any reports of blown gears yet...


Morgan
cycle9.com
Click to expand...

The most I have seen with the watt-up is 1300 watts or 26 amps into the infineon controller, but yes, that is too much for the nylon gears over the long run. The hub has never gotten hot at all according to the temperature sticker, but I think that mechanical shock on acceleration did them in. Cycle9 has been very responsive in helping me out. Hopefully, these new gears will breathe new life in.

BTW, any one know the type of grease in there and what kind of screws are holding the gears on? I haven't been able to separate things far enough to get a good look.
 
The most I have seen with the watt-up is 1300 watts or 26 amps into the infineon controller, but yes, that is too much for the nylon gears over the long run. The hub has never gotten hot at all according to the temperature sticker, but I think that mechanical shock on acceleration did them in. Cycle9 has been very responsive in helping me out. Hopefully, these new gears will breathe new life in.

BTW, any one know the type of grease in there and what kind of screws are holding the gears on? I haven't been able to separate things far enough to get a good look.
Click to expand...

Hi, thank you for the kind words.

The grease looks like standard automotive/gear grease. I have queried with BMC to see whether I can get more specifics on it.

I will also get more details on what you need to do for gear replacement. Sorry it is taking a while, I am pushing them. But I suspect it may involve using a bearing press to separate (I don't have an open motor in front of me, but that's what I concluded last time I looked). An automotive bearing puller might be made to work.

Morgan
 
I've only got 28teeth metal gear for bafang, its out of rear motor ( not the tiny front one), which motor has 32teeth?
 
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