[ausev] Hub motors

[evehicle4me at hischopsticks.org]

RE: sources of motors

http://www.pmlflightlink.com/motors/hipa_drive.html
http://www.alibaba.com/trade/search?Type=&ssk=y&year=&month=&location=&keyword=&SearchText=car+hub+motors&Country=&srchYearMonth=&IndexArea=product_en&CatId=0

The alibaba site is for wholesalers but if you contact the factory you  
may be able to buy from them or be able to find their distributors -  
if they have some near you.  If you look on both sites I think they  
both also have controllers for these motors.

Yes I have heard the concerns about the weight of the wheel.  If I  
found an all wheel drive vehicle and attached the motor to the half  
shaft going to the wheel I think this would erase the spring/unsprung  
weight problem.  I know that DC motors have a select range of  
efficiency but I think if 4 motors were working together the number of  
motors would work like gears, i.e. low gear would be all 4 motors  
engaged, high gear would be only two motors engaged.  I don't think it  
would be a good idea to have only one or three wheels being powered.

Thanks for the input.  It is nice to be able to chat with such  
knowledgeable people :)



Quoting Clendon Gibson <bsandyman at yahoo.com>:

> Could this not be addressed by not using all the Torque an electric   
> motor has available? Unless you are building a drag bike do you   
> really need so much torque you can bend the frame?
>
> Either get a smaller sized electric motor or limit the max current   
> you apply to the motors you do get?
>
> Of course I am a newb and may be talking out of my hat.
>
> ----- Original Message ----
> From: MLAB <mlibrik at att.net>
> To: AustinEV News Announcements and General Discussion <ausev at austinev.org>
> Sent: Tuesday, April 22, 2008 2:21:13 PM
> Subject: Re: [ausev] Hub motors
>
> I had posted a similar inquiry some time ago.  One problem with hub
> motors that was pointed out to me then involved torque by the motor on
> its mountings.
>
> On a bicycle, the frame (or fork) extends to the axle so the motor can
> typically lever against the dropouts on the fork (front wheel mount) or
> the rear dropout plates.  Chinese hub motors use oversized axles that
> are flatted to fit into the dropouts so the axle cannot rotate within
> the slot.  German Heinzmanns (or "whiny Heineys" as I call the ones on
> the rear wheels of my HPM Tri-Hauler) use torque arms like you'd see on
> a bicycle drum brake, bolted to the frame 6 inches or so from the dropouts.
>
> On a conversion automobile, the chassis is reinforced around the engine
> mounts, so that is the only place strong enough to bolt down the motor
> without it just breaking loose and spinning in place.
>
> A compromise solution would involve multiple motors mounted on the
> centerline of the chassis, each driving an individual wheel like a hub
> motor does (also allowing for suspension of the wheels), but even this
> would require a custom chassis or serious customization of a conversion
> chassis.  Putting a single, big motor where the engine usually lives
> saves all that trouble, apparently.
>
> --
> Mike Librik, LCI #929
> Easy Street Recumbents
> Austin, TX
> (512) 453-0438
> www.easystreetrecumbents.com
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