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green_is_now
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re: Electric hub motor improves EV range: Part 1—Technology basics
green_is_now   1/5/2013 4:07:37 AM
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The switches need to be able to handle both high current in one scenario and high voltage in the other extreem. So the semiconductors size and cost go throught the roof, add the IR loss gain for needed worst case voltage needed, making this not feasible quickly.

green_is_now
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re: Electric hub motor improves EV range: Part 1—Technology basics
green_is_now   1/5/2013 4:02:12 AM
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The problem is in all the IR and reactive losses of the matrix wiring and switches, and there cost

HoosierDaddy0
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re: Electric hub motor improves EV range: Part 1—Technology basics
HoosierDaddy0   7/5/2011 5:33:43 PM
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Has anyone heard of BionX, www.bionx.ca? They make hub motors used in boost systems for bicycles and velomobiles. Their systems go up to 500 watts and are priced around $2,000 with a control system using regenerative braking, http://www.youtube.com/watch?v=eSFE151tRdM. Is the system described here better or cheaper than the BionX system? I want to mass produce velomobiles with boost systems controlled by I-pads, and could use the help of some smart guys like you.

graduatesoftware
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re: Electric hub motor improves EV range: Part 1—Technology basics
graduatesoftware   6/26/2011 1:13:11 AM
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Readers are directed to two sites: http://www.technologyreview.com/energy/21666/ http://www.launchpnt.com/portfolio/aerospace/uav-electric-propulsion/ It doesn't look like Exro weathered the recession very well since I haven't seen anything from them lately, but my original analysis of their approach/patent (switched coils to change torque characteristics) led me to believe that the engineering was sound. Likewise for LaunchPoint.

WarlockofOz
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re: Electric hub motor improves EV range: Part 1—Technology basics
WarlockofOz   6/6/2011 3:27:53 AM
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I think you are getting confused between cm and mm. A 10cm(100mm) axil will, depending on what it is made from will easily hand up to 5 x 1.5 tons. I've lifted components up to 30 tons on pins that thick.

davealle007
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re: Electric hub motor improves EV range: Part 1—Technology basics
davealle007   5/11/2011 2:42:23 PM
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Thats kinda scarey, just anyone that knows enough to be dangerous can post all this with the editor of EE times to go ahead and let it happen. I guess thats the downside of this kind of forum. The good side is that someone like roldan speaks up to reprove it, but is he right?

DrQuine
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re: Electric hub motor improves EV range: Part 1—Technology basics
DrQuine   5/9/2011 10:37:34 PM
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Two years ago "EE Times" reported that "Daimler bus combines hub motors, fuel cells" (http://www.eetimes.com/electronics-news/4197774/Daimler-bus-combines-hub-motors-fuel-cells) so it would appear that the deployment problems for hub motors are not insurmountable. It sounds like one challenge will relate to car handling characteristics having additional mass that will be moving with the wheels (rather than the vehicle body). This is probably less of an issue for a bus. Another design issue will be to ensure that the hub mounted motors are designed to tolerate exposure to the elements near the wheels rather than being protected in the engine compartment.

roldan
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re: Electric hub motor improves EV range: Part 1—Technology basics
roldan   5/7/2011 12:37:47 PM
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I would very much like to be a naive high school kid. Unfortunately, I am a retired electronics engineer, with 40 years of background in the industry, acting now as an independent consultant. Almost twenty patents filed. Six presentations at international conferences. One invited paper at ISSCC. My career is behind me. To be fully honnest, when I tried to patent this concept, I found that this was already done almost twenty years ago. There are at least two naive high school kids dreaming in the world. But, apparently, the other one failed in promoting the concept. I think, but you can disagree, that it can be very beneficial for the whole industry, and not only the automotive one. For an independent consultant, the automotive industry is too big. I'm more interested in other applications, looking for attractive small niches. But, if I can convince the automotive industry to go in this direction, this should help for developing smaller businesses. I would enjoy replying to technical questions. In your comment, I can't see any requesting an answer. Please, consider the concept, and not the implementation details.

BOY Dela Pena
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re: Electric hub motor improves EV range: Part 1—Technology basics
BOY Dela Pena   5/5/2011 1:23:20 PM
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The design looks very good and will have some other usage, The main thing is how much it will cost and how you can have more detailed information. Thank you, Godofredo Dela Pena

Efried
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re: Electric hub motor improves EV range: Part 1—Technology basics
Efried   5/4/2011 7:36:51 AM
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mass per power of course kg/kW

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