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How can I make a bicycle wheel spinning at least 2 rotations per sec? Answered

Hi there!

I am looking for an alternative way to spin a bicycle wheel.
The wheel is 26 inch and needs to spin at least 15kph (10mph).
I want to make a display of the Monkey Light Pro I won in the Bicycle Contest. 

The calculation:

The wheel has a circumference of 2.1m.
15000m / 2.1m / 60min = 120 rotations per minute / 2 rotations per sec.

Does anyone now How I can make this. It does not have to be exact as long as the speed is over 2 rotations per sec. (15kph/10mph)

I would like to use an electric engine that does not need any work to it and can be recycled from another device.

Idea: could an old fan work?

Discussions

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steveastrouk

Best Answer 2 years ago

120 RPM isn't very hard at all. If you just push the shaft of a motor 1" in diameter spinning at 3000 RPM to your bike rim it will work nicely. 3000 RPM, or close to it, happens to the the speed of a normal AC induction motor in Europe, so a fan MIGHT have enough torque for you.

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The Dutch cycliststeveastrouk

Answer 2 years ago

Thanks a lot for your answer! At first I was thinking to put the motor directly on the shaft but I think this makes a lot more sense. If I would put on a wheel with a circumference of 10 cm (diameter slightly more than 3cm for easy calculation) on it it will generate 210 RPM on the bike wheel (26 inch).

That's 26.4 kmh.

I will give it a try!

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Quadrifogliosteveastrouk

Answer 2 years ago

+1 on the fan motor.

Take a look at Universal Bathroom Fan Replacement Electric Motors (AC); $10.00 USD. Plug it in and go; no power conversion, cheap and durable. All you need is a 1" sizer. Even if it doesn’t have the starting torque, you give it a nudge.

Actually, the old (1980’s vintage) 12” table fans I own run around 1000 to 1500 RPM depending on the speed setting. Do me a favor, if the donor fan is a 12” table fan marked Kuo Horng 203 or kh-203 (Panasonic and Windmere brands), hang on to it. They are quiet, durable, and move the air well.

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The Dutch cyclist

2 years ago

By this post I would like to thank you all for giving your thoughts on this topic!

I will post it here when it is finished!

Cheers!

Mart (The Dutch Cyclist)

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Yonatan24

2 years ago

An old fan won't work. Those types of motors spin very fast, but don't have a lot of power (torque). What you're looking for is a motor with high torque, and fairly fast speed, if you don't want to use any gears...

A drill could work well for a project like this. Search online for "Drill powered bike"

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steveastroukYonatan24

Answer 2 years ago

I disagree. The OP needs no real torque for this, and a bike wheel is very free spinning. Push the shaft of the motor onto the rubber tyre, and you should have a pretty effective drive.

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Downunder35m

2 years ago

I like to salvage old inkjet printers for these type of projects.
They often use a blet driven DC motor to drive the print head.
It gives you an easy to use motor, suitable belt and a little tensioner to work with.
If you glue or screw a pulley on the circle where the spokes mount you should be good to go.
Speed can be adjusted by pulley size or changing the input voltage to the motor.