Would a "Harmonic drive" be an option to adapt electric motors to existing motor bike drive shafts?

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Mik
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Would a "Harmonic drive" be an option to adapt electric motors to existing motor bike drive shafts?

Would a "Harmonic drive" be an option to adapt electric motors to existing motor bike drive shafts?

See at:
http://www.harmonicdrive.net/reference/operatingprinciples/

This might open up a whole lot of bikes for conversions.

Mik

davew
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Re: Would a "Harmonic drive" be an option to adapt electric moto

Isn't this the basis behind Wavecrest's technology? The Tidalforce bike is no longer being made, but a French company bought up the rights as I recall. I haven't heard anything about it since.

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Mik
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Re: Would a "Harmonic drive" be an option to adapt electric moto

Isn't this the basis behind Wavecrest's technology? The Tidalforce bike is no longer being made, but a French company bought up the rights as I recall. I haven't heard anything about it since.

I believe it is totally unrelated technology, but I might be wrong.

I found it difficult to find details about the Wavecrest stuff, but what I found sounded like a multi-phase motor design, nothing to do with a transmission.

from: http://www.harmonicdrive.net/reference/operatingprinciples/
Highest Torque -to- Weight Ratio
Harmonic drive gearing offers the highest torque/weight and torque/volume ratios of any gearing technologies. The lightweight construction and single stage gear ratios of up to 160:1 allows the gears to be used in applications requiring minimum weight or volume. Small motors can exploit the large mechanical advantage of a 160:1 gear ratio to create a compact, lightweight, and low cost package.

Looks like the missing link to me....

Mr. Mik

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wiggo
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Re: Would a "Harmonic drive" be an option to adapt electric moto

I think the Harmonic Drive would be a too expensive solution to be used in electric scooters/motorcycles since it's made for high precision applications that require zero backslash. It would be hard to motivate the cost in an application where precision is not needed.

What reduction ratio is needed?

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Viktor

LinkOfHyrule
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Re: Would a "Harmonic drive" be an option to adapt electric moto

I calculated that I needed like a 10:1 final ratio to do like 23mph with a 3000rpm motor with a 26" rim. Sort of near the edge for a single gear.

But, when everything switches to A/C induction or something, then we're going to need ratios on the order of like 30:1 or more.

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Mik
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Re: Would a "Harmonic drive" be an option to adapt electric moto

I calculated that I needed like a 10:1 final ratio to do like 23mph with a 3000rpm motor with a 26" rim. Sort of near the edge for a single gear.

But, when everything switches to A/C induction or something, then we're going to need ratios on the order of like 30:1 or more.

Yes, I missed the detail that these transmissions start at around 50:1 - not suitable!

Mr. Mik

This information may be used entirely at your own risk.

There is always a way if there is no other way!

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