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Old 01-03-2013, 09:28 AM   #1 (permalink)
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Protean electric hub motors in 2014

Article about funding and making them in China.
Protean Electric snags $84 million to produce in-wheel motors in China


Video in link above is worth watching.

Company website:
Protean Electric

I first saw an image in a car forum and looked it up, which first brought me to this short article below.

2013 10Best 10 Most Promising Technologies – Feature – Car and Driver

Quote:
WHEELING AND DEALING
Ferdinand Porscheís idea of building a hybridís electric motors into the wheel hubs leaves more space for passengers and batteries, but carmakers have hesitated to adopt this arrangement, fearing that major increases in unsprung weight will harm rough-road ride and handling. Challenging that assumption, Protean Electric contracted with Lotus Engineering to conduct extensive tests *comparing a standard sedan with one propelled by wheel-hub motors. Lotusís surprising conclusions: Average drivers wonít notice the performance degradation attributable to extra unsprung weight, and normal development tuning should overcome most steering, ride, and handling ill effects. Protean expects to start wheel-hub-motor production in 2014.

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Old 01-03-2013, 12:43 PM   #2 (permalink)
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I wouldn't build a new vehicle with hub motors, but to retrofit an older car with them sounds like a good idea. I am also under the assumption they will be lacking in power. I am no expert though maybe they will prove me wrong.
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Old 01-05-2013, 01:31 AM   #3 (permalink)
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Rear-mounted hub-motors are the electric drive layout I'm less unfavorable for a daily-driver. If 4WD was required, I'd rather bolt a single motor to a differential, since unsuspended mass in the directional axle leads to a heavier steering.
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Old 04-26-2013, 11:10 AM   #4 (permalink)
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Here's another in-wheel hub motor:

Green Car Congress: Ford and Schaeffler demonstrate Fiesta-based e-WheelDrive car; follow-up research project in the works

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Old 04-26-2013, 12:26 PM   #5 (permalink)
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I don't like hub motors because they tend to be limited in size and the lack of gearing. 516 ft-lbs might sound like a lot of torque. But at the wheels, it's a fraction of the torque available from the ICE Fiesta.

Quote:
Lotus’s surprising conclusions: Average drivers won’t notice the performance degradation attributable to extra unsprung weight, and normal development tuning should overcome most steering, ride, and handling ill effects.
I find that hard to believe. People can tell a difference from losing a total of 10-20lbs for lighter wheels on a Miata. Do they really expect us to believe we won't feel 50-100lbs more?
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Old 04-26-2013, 03:53 PM   #6 (permalink)
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Quote:
Originally Posted by Allch Chcar View Post
I don't like hub motors because they tend to be limited in size and the lack of gearing. 516 ft-lbs might sound like a lot of torque. But at the wheels, it's a fraction of the torque available from the ICE Fiesta.

I find that hard to believe. People can tell a difference from losing a total of 10-20lbs for lighter wheels on a Miata. Do they really expect us to believe we won't feel 50-100lbs more?
Its unfortunate the hub wheel unicorn can't fly, I could live with the unsprung weight on the rear of both the honda insight & cobalt I own and on the subuaru 360 front wheels if it meant I could recycle a cheap Ford Escape pack into a regen/limited distance ev system. Heck the subaru would drive 8 miles on that pack, maybe more.

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Old 04-26-2013, 10:16 PM   #7 (permalink)
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Wheels only spin up to about 900RPM - so why would they need gearing? They have tons of torque already. The SIM-Drive hub motors are very efficient. Direct drive motors (with drive shafts straight to the wheels) have nearly the same efficiency, but can have *less* unsprung weight than typical, if you put the brakes inboard. The FVT eVaro did this.
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Old 04-27-2013, 03:46 AM   #8 (permalink)
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Quote:
Originally Posted by Allch Chcar View Post
I don't like hub motors because they tend to be limited in size and the lack of gearing.
I actually like the compact size of hub-motors due to the space savings, which can ease the arrangement of the battery banks or eventually leave more room for the trunk.
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Old 10-14-2013, 01:01 AM   #9 (permalink)
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I found the thread via Search and mentioned it in another thread.

Quote:
Originally Posted by myself
4.5" thick, 16" in diameter and ~100 horsepower
A commercial product on the market in 2014
Requires an 18" wheel and is geared for 1000-1500rpm
reference controller code for evaluation testing
communicates via CAN bus
It appears that the low-speed/high-torque design with integral multiple micro-inverters is very efficient at regeneration which suggests you lose the unsprung weight of the mechanical brakes.

Quote:
Originally Posted by myself, again
Their videos suggest the motor has an open center so a driveshaft can pass through. Can a differential for inboard mounting be far behind?

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