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Old 02-05-2009, 10:36 AM   #11
longride
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"Even if I wanted one, I can't get one; they are only available in CA, NJ, and NY."

I'm glad you put an 'even if I wanted one' when describing that POS. You wouldn't get one on a bet.
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Old 02-05-2009, 10:42 AM   #12
tripleripple
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Quick question, maybe somebody knows. What is the engine braking on an electric motor like? What happens when you roll off the throttle? If there's 100% torque when you open the throttle, is there 0% torque when you close it?
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Old 02-05-2009, 11:04 AM   #13
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Quick question, maybe somebody knows. What is the engine braking on an electric motor like? What happens when you roll off the throttle? If there's 100% torque when you open the throttle, is there 0% torque when you close it?
All the recent cars use "regenerative braking." Another fine example of using energy more effectively instead of throwing it away as heat; in the case from the rotors and pads. I understand that you vary the regenerative effect as you press the pedal harder. I'm sure ABS would be a no-brainer for this setup. If you wanted ABS...
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Old 02-05-2009, 11:47 AM   #14
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Quick question, maybe somebody knows. What is the engine braking on an electric motor like? What happens when you roll off the throttle? If there's 100% torque when you open the throttle, is there 0% torque when you close it?
Turn an electric motor on. After it spins up turn it off. You'll notice that it'll slow to a stop dependent on what's connected to it. A motor like a grinder motor will slowly come to a stop because there is no electric force applied to motor windings. It "free wheels". However an electric motor can also be used as a generator. So if you design it properly it can be used as a brake that puts charge back in the battery. They call it "regenerative braking". It's similar to compression braking you get when you let off the throttle.
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Old 02-05-2009, 12:09 PM   #15
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Turn an electric motor on. After it spins up turn it off. You'll notice that it'll slow to a stop dependent on what's connected to it. A motor like a grinder motor will slowly come to a stop because there is no electric force applied to motor windings. It "free wheels". However an electric motor can also be used as a generator. So if you design it properly it can be used as a brake that puts charge back in the battery. They call it "regenerative braking". It's similar to compression braking you get when you let off the throttle.
So, you're saying that this setup can actually reclaim the vehicle's kinetic energy instead of wasting it as heat as with typical braking systems? Wow, who knew?
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Old 02-05-2009, 12:16 PM   #16
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Yes, guys, I understand. I've read just about every article written about electric bikes, which should explain my lack of enthusiasm. I didn't mean to imply that it should have a transmission, just that it doesn't sound like much fun.

I seem to remember most of us were not enamored with the prospect of an automatic transmission on a conventional bike. Granted, not the same thing, but no manual shifting required.

Forgive me for not relishing the idea of sitting on a whining two-wheeled blender with outrigger stabilizers, GPS-activated auto-braking, cone of silence/saftey, and optional zero-impact latte machine.

Oooh, you mean I get to twist the throttle occasionally? Yay...


(BTW, if these things actually reach a high level of performance, don't you think they're going to have to reduce torque in some manner? Do you really want 100 ft. lbs. immediately accessible? )
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Old 02-05-2009, 12:24 PM   #17
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Yeah, guys, I understand. I've read just about every article on electric bikes, which should explain my lack of enthusiasm. I didn't mean that the bike should have a transmission, just that it didn't sound like much fun.

Forgive me for not relishing the idea of sitting on a whining two-wheeled blender with stabilizing outriggers, GPS-activated auto-braking, cone of silence/safety, and an optional zero-impact latte machine.

Oooh, you mean I get to twist the throttle occassionally? Yay...

(BTW, don't you think that when these things actually achieve high performanace, they'll have to limit the torque in certain situations? Do you really want 100+ ft. lbs. acessible from a stand-still?)
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Old 02-05-2009, 01:11 PM   #18
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Yeah, guys, I understand. I've read just about every article on electric bikes, which should explain my lack of enthusiasm. I didn't mean that the bike should have a transmission, just that it didn't sound like much fun.

Forgive me for not relishing the idea of sitting on a whining two-wheeled blender with stabilizing outriggers, GPS-activated auto-braking, cone of silence/safety, and an optional zero-impact latte machine.

Oooh, you mean I get to twist the throttle occassionally? Yay...

(BTW, don't you think that when these things actually achieve high performanace, they'll have to limit the torque in certain situations? Do you really want 100+ ft. lbs. acessible from a stand-still?)
Well, I haven't read many article on electric bike or cars, but I have a fairly extensive understanding of batteries. As long as we continue to use chemical batteries we will remain in a sort of stone age for electric vehicles. Chemical processes simply don't store enough energy. All the hype and embracing new paradigms through positive process management won't change the physics of chemical storage. As we are learning form observing the White House, once again, reality doesn't bend through clever words, wild promises and co-ordinated ad campaigns. A sow's ear is still a sow's ear.
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