[ausev] Hub motors

[John Penry at Texrocks]

Hub motors have been around a while. This company makes hub motors for golf 
carts.
http://www.caddybug-usa.com/catalog/hub_motors.php
They also have a story about Porsche's first series hybrid, built in 1901.

John in Seguin

----- Original Message ----- 
From: <evehicle4me at hischopsticks.org>
To: "AustinEV News Announcements and General Discussion" 
<ausev at austinev.org>
Sent: Tuesday, April 22, 2008 11:00 PM
Subject: Re: [ausev] Hub motors


> 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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