hub motor with transmission built in
I thought this NSK hub motor pretty interesting.
These could be so great for a parallel hybrid on a front wheel drive car, saving interior space. The problem with the motors I have seen (such as QS-motor) is that most cannot rev fast enough with no load. The best QS motor in this regard revs 1000 with no load: a car would be limited to maybe 70 mph without large tire/wheel combos. (I think I understand that correctly.) https://www.youtube.com/watch?v=Y2tlXHiPTFY I imagine like Proteon, Michelin "active wheel," and other motors, it may never go to market (at least it seems that way with these designs). |
Hmm gear reduction via planetary?
Anyway RPMs are a hub motor issue but only at startup since you don't have enough torque to start the car rolling Never heard of top speed as being an issue with hub motors, |
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6000W V3 Electric Car Hub Motor(273 Model) - qs-motor.com |
Since the direct reversibility and the ability to get rid of a transmission are the most highlighted advantages of hub-motors, I wouldn't hold my breath for this setup to become commercially available. But who knows...
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They are only used on bikes because the person can "push off" to get the thing moving. So I suppose the worlds first usable automotive hub motor might sell. Actually if the thing is reliable it would be the first to work on a car. I think that is important, just have to wait for China to clone it so it's cheap enough to use for hybrid conversions |
They don't seem to intend to bring the whole design to market, just some of the parts, such as a bearing they designed for it. I guess they realized--maybe from the beginning--the limitations you both are pointing out.
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On the other hand, that NSK motor looks like it would be pretty cool and might work really well if you were rich enough to afford a couple. |
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Other hub motors that I have read about ... the motors wear out and fail (quite spectacularly) before the first set of tires is worn down. There is not much clearance between the rotor and stator on a modern electric motor of any type - induction, PM, BDC. There is a lot of load on the bearings - since that is what is holding the car off the ground ... and taking the bumps since the motor is unsprung ... no suspension to smooth things out. Only one bearing on one side gives the hub motor a couple of additional challenges. After a few thousandths of an inch of wear on certain parts of the bearing ... some part of the stator meets some part of the rotor and *BAD* things happen. From my limited understanding, the bicycle hub motors benefit from having support on both sides like a traditional motor. Both ends are connected to the bicycle frame. And bearing wear is not nearly such a big deal. |
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The obvious answer is to use tandem motors with half shafts. Then you don't have gear losses, and you have much lower unsprung weight, too. |
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What they showed looks bulky to me; not seeing a radical increase in useable space :/
Seems simple to me to put a rubber coupler between the motor and wheel bearings; then loose wheel bearing tolerances don't wreck the motor. Like this: https://goo.gl/images/ZBQNQe |
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