Search results

Date Relevance Most replies

  1. W

    Most quiet e-bike motor?

    That makes sense. Thanks for all your help. I have learned a lot from this discussion.
  2. W

    Most quiet e-bike motor?

    Let me see if I understand what's happening. Each of the three phases of the generator produces a sine wave voltage. When connected to a full-wave rectifier, current will flow only when the phase voltage exceeds the forward voltage of the rectifier diodes. When the phase voltage is less than...
  3. W

    Most quiet e-bike motor?

    I'm a bit surprised the sides of my motor would amplify the harmonics that much, because they aren't that large. I was using a small DD 250 W mini hub motor that's about 145 mm in diameter, not one of the larger DD motors thatseem more popular on this forum. Here's the rectifier portion of my...
  4. W

    Most quiet e-bike motor?

    My mother-in-law has one of those, too. Are you generating electricity with it, or just use it for exercise? The seat base is 1-1/2" of regrind foam rubber topped with 1/2" of medium-density foam, which is wrapped in batting and mounted on a 1/2" plywood base. The seat is covered with black...
  5. W

    Most quiet e-bike motor?

    I don't think you gain much in efficiency with a flywheel. I generate about 45-60 W, depending on my load, and pedal at a cadence of 80 RPM while I work. The power output of people using a (non-electricity-generating) bike desk in a 2014 study averaged 59-86 W, depending on the resistance...
  6. W

    Most quiet e-bike motor?

    Yes, that was the sound I was getting. (I say 'was' because I'm currently using a Bofeili mid-drive motor.) Thanks for letting me know about the TSDZ2. How does its noise level compare to a Bafang or Ling Bei mid-drive motor? I prefer using a mid-drive motor in a project like this...
  7. W

    Most quiet e-bike motor?

    Yes, I tried putting various thickness of rubber underneath the motor mount, before bolting it to the tubing. It made little difference.
  8. W

    Most quiet e-bike motor?

    Thanks for your advice. Yes, the hub motor only made noise under load. When it wasn't connected to anything, it was much more quiet. The motor was mounted in a custom mount I made from 2"x3/16" aluminum flat bar which clamped onto the end of a piece of 1"x2"x1/8" rectangular aluminum tube...
  9. W

    Most quiet e-bike motor?

    I am simply rectifying the output using a full-wave bridge rectifier, then buffering it with a 10 Ah LiFePO4 battery and some capacitors. I've tried driving the hub motor with both a chain and a V-belt. Both were fairly loud. It was worse when the axle nuts of the hub motor were tightened...
  10. W

    Most quiet e-bike motor?

    I am making a pedal-powered generator and would like to make it as quiet as possible. I have used a Conhis direct-drive hub motor and a Bofeili mid-drive motor on past units. Both motors made more noise than I would like. Is there anything that would be more quiet, excluding those that can't be...
Back
Top