safe
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- Mar 28, 2009
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Most likely just an AC induction motor.
That's what I thought it might be...
The reason this seems so interesting is that the "Holy Grail" of electric motors for cars is an Induction motor. The Tesla uses an Induction motor. So here we have an essentially "free" motor (there are millions of dishwashers that fail for other reasons than the motor and are thrown away) and the size and weight appears to be right for an ebike.
All that would be needed is a way to generate the 120 Volts AC that the system desires. If your ebike had 120 Volts of battery then all you would need is to design (or buy) a controller that converted the DC to AC. Here you might even be able to explore ideals like VARIABLE frequency AC as a way to increase performance. (some research into Tesla's Induction motor and controller would be useful)
120 Volts is a little high for an ebike... but one cannot be certain that 120 volts is REQUIRED. Maybe with some tinkering you could invent some controller that ran on 72 Volts of AC and still get it to work right. Motors are not always directly tied to a specific voltage.
It's an interesting thought... and Induction motors SOLVE the basic problem of ebikes in that they offer better low end torque which matter more than the top end. Ebikes are always starting and stopping and rarely run at the same rpm for long. And with multispeed gears it's even more interesting because it widens the powerband a great deal.
If this all worked as a test case, then maybe down the road people start to build better ebike Induction motors for the actual products people buy. To my knowledge the Induction motor begins to make sense at about 1KW of power and that's right about where we want to be. (some desire 5KW of power of course)
A lot to think about...
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