This link won't open on my PC but it's OK on my phone.
www.notebookcheck.net/First-mass-electric-car-with-all-wheel-hub-motors-has-no-brakes-or-CV-joints.1161478.0.html
In case you can't open it it's anew CHinese EV with
536hp output from 4 x 100kW all wheel hub motors (1st in the world!)
Huge reduction in drivetrain elements
No traditional braking system (yes here have been reports of issues already! but I expect they'll be overcome)
25% higher energy recuperation giving a 650km range
The article says it should be released in time for the spring Beijing auto show.
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1. It looks a bit like a Tesla.
2. With electric motors in the wheel hubs, what about unsprung weight and its effect on handling?
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>> 2. With electric motors in the wheel hubs, what about unsprung weight and its effect
>> on handling?
Body control should be easier. Most handling tweaks are to prevent the weight of the body and drive train affecting the wheels
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How are four wheel hub motors and control systems to manage power and braking on each wheel less complex than one large motor plus differentials.
Unsprung weight I think adds to inertia in the suspension making road surface irregularities more difficult to control. Possibly why inboard discs and alloy wheels became popular.
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Conventionally, you’d want to minimise unsprung mass as the ‘heavier’ the wheel/tyre/hub/brake assembly is, the more work the suspension has to do to control it as it deflects over bumps in the road. Meaning that spring and damper rates have to be higher to cope. Affecting ride quality.
However what’s crucial is the ratio of sprung to unsprung mass. If we put a motor at each corner of a one tonne MX-5, the effects would be catastrophic. But the same arrangement on a largish SUV with a 600KG battery, it may prove less so.
It’ll be an interesting drive.
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Dongfeng eπ 007 - James Loveless
