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Thread: Building electrical exercise bike

  1. #1
    Associate Engineer
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    Building electrical exercise bike

    Hi guys,

    If any question like this was asked before, sorry. We intend to build an exercise bike with a brushless motor. Anyone will be able to adjust the difficulty of bike. It could be easier or harder to cycle.

    We think, a 300-350W brushless motor is a good choice. What other parts we will need?

  2. #2
    Technical Fellow jboggs's Avatar
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    Just off the top of my head, a seat? Maybe a support frame? Oh, and maybe pedals? Just razzing you. That's a pretty open-ended question! You'll get a better response if you bring more to the table, like a preliminary design with just a few very specific questions.

  3. #3
    Lead Engineer Cake of Doom's Avatar
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    Are thinking of using the motor to provide the resistance against the cyclist or to round up stray cats? Break the Coulomb barrier?

    I know it's called a Design Brief but that was just plain abrupt! Little bit more info required please.
    Last edited by Cake of Doom; 02-04-2016 at 09:32 AM. Reason: Blame Batman!

  4. #4
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    Thanks for your answers,

    I didn't express the idea, sorry for that. It will be a spa bike

  5. #5
    Administrator Kelly Bramble's Avatar
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    Quote Originally Posted by Cake of Doom View Post
    Are thinking of using the motor to provide the resistance against the cyclist or to round up stray cats? Break the Coulomb barrier?.
    You funny...
    Tell me and I forget. Teach me and I remember. Involve me and I learn.

  6. #6
    Lead Engineer Cake of Doom's Avatar
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    Something like this?

    3227.jpg

    So the motor powers a pump for the water jets? How are you going to provide the resistance against the rider? Is everything going to be controlled electronically or mechanically or a bit of both? Where will it be intended for use, home or hydrotherapy centre?

    These are some questions you'll need to decide on if only for the cost implications. As it stands, you need a bike and a bathtub.

  7. #7
    Administrator Kelly Bramble's Avatar
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    First, see the following videos on how Brushless Motors Work.

    Brushless DC Motor, How They Work

    Brushless DC Motors & Control - How it Works (Part 1 of 2)

    Brushless DC Motors & Control - How it Works (Part 2 of 2)


    You will need to size the Brushless motor appropriately and then develop electronics that will reverse the polarity applied to the windings to create resistance to rotation instead of rotation.
    Tell me and I forget. Teach me and I remember. Involve me and I learn.

  8. #8
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    You could just run the motor leads to a rheostat of sufficient wattage and connect them together.

    (try turning motor with leads shorted together)

    I'd go with a larger motor (700w -1.5KW)

    MB

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