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  1. W

    Torque-Sensor Motor w/ Sine-Wave Controller Build

    Congratulations on writing your own FOC firmware. I know just enough about the algorithm to know that it can be a daunting task to get it to work correctly. The audible change in my controller was due to a different waveform being fed to the motor, but I do not know enough about the internal...
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    Compact Field Oriented Controller, ASI + Grin, limited run

    Three Hall sensors indicate the position of the motor rotor by providing a total of 6 signal transitions for each 360-degree electrical cycle, i.e. 60 degrees apart (The period of an electrical cycle is the time it takes a pair of rotor magnets to pass a fixed point on the stator.) When using...
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    Compact Field Oriented Controller, ASI + Grin, limited run

    You will find your answers starting on page 3 of this thread.
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    Cirrus Cycles BodyFloat Suspension Seatpost

    Glad you like it! That looks like a comfy setup.
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    Cirrus Cycles BodyFloat Suspension Seatpost

    Yes, I have had no recurring back issues since I installed my BodyFloat. I would definitely recommend you get one if your budget allows.
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    Cirrus Cycles BodyFloat Suspension Seatpost

    The setback of the BodyFloat is minimal compared to that of a regular seatpost. In fact on my setup the setback is identical to that of the seatpost that I replaced (Kona Simplicity). The BodyFloat is currently hand assembled in a small factory in the USA as opposed to being mass produced in a...
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    Compact Field Oriented Controller, ASI + Grin, limited run

    Cycle Activator Definition of activator: - thing that activates (switches on, energizes, sets in motion) - impurity in a mineral that causes luminescence (cool light emission) Glow-in-the-dark controllers would be awesome. 8)
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    2WD (Two-Wheel Drive) FAQ

    Teklektik's analysis is spot on. If you enter CdA = 0.29 (half the mountain bike frontal area) and Cr = 0.008 (same as mountain bike rolling resistance) and custom weight = 52kg (half the mass) you will get exactly what the graph above shows for max speed. So now that I have revealed the magic...
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    E-Bike trailer

    That's a work of art. Thanks for sharing.
  10. W

    Cirrus Cycles BodyFloat Suspension Seatpost

    Another view of the internals taken during reassembly. The longer cap screw goes on the end and the shorter one goes in the middle. To protect my investment I use a uniquely keyed seatpost lock with collar ($35) from http://www.pinheadlocks.com.
  11. W

    Cirrus Cycles BodyFloat Suspension Seatpost

    Removing the cap screw on the lower right side plate allows both side plates to be pulled off of the bearing pins. Notice that the bottom spring is longer than the top spring. When ordering replacement springs you have a choice of colors and whether you need a top or bottom spring.
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    Cirrus Cycles BodyFloat Suspension Seatpost

    Sorry to hear that. I sent you a PM.
  13. W

    Cirrus Cycles BodyFloat Suspension Seatpost

    BodyFloats are adjusted for rider weight up to 260 lbs. through the use of 4 different spring thicknesses in 7 combinations. Replacement springs are color-coded white, purple, black, and orange in order of increasing stiffness. The bottom spring is freed by loosening the pre-load bolt and...
  14. W

    Cirrus Cycles BodyFloat Suspension Seatpost

    The 27.2mm post is carbon fiber with very clear height adjustment markers. BodyFloats are available in 330mm and 380mm lengths (carbon) and 450mm (titanium) with weights of 428g, 465g, and 548g respectively. Another view of the bottom spring with the pre-load adjustment bolt. (That's a blob of...
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    Cirrus Cycles BodyFloat Suspension Seatpost

    The pre-load adjusting bolt on the right allows for a range of 1/4" to 1-1/4" of up-and-down travel to suit the riders preference. The arrow and dots act as preload indicators, but I think newer models will use numbers rather than dots. The red cyclinders are end-of-travel elastomers. The...
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    Cirrus Cycles BodyFloat Suspension Seatpost

    I was fortunate to be able to purchase a Cirrus Cycles BodyFloat suspension seatpost directly from the makers. I have been riding with it on my Kona Minute cargo bike for about 4 months now. Prior to the BodyFloat my lower back would get sore after every ride through town. Now I rarely notice...
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    Torque-Sensor Motor w/ Sine-Wave Controller Build

    Hi SolarRay, I took my burned out XOFO torque-sensor motor apart today and can confirm that the laminations are 0.5mm thick.
  18. W

    Has anyone got an Ursus Jumbo centre stand?

    Depending on the hardness and evenness of the surfaces that you typically park on, I would say anywhere from 1 to 3 inches of front tire clearance is good. From our measurements it looks like you would get about an inch. If you need more clearance than that you can always add a metal shim...
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    Has anyone got an Ursus Jumbo centre stand?

    I recently installed one on my cargo bike to replace the weak and broken OEM one. I am very pleased with its stability, and how it folds back out of the way, yet clears my 2.35" tires. The only disadvantage I see is that with the legs down the cranks won't clear, which makes it a bit less...
  20. W

    2 Speed Xiongda hubmotor

    It's another $16 (USD) for the controller for this motor. I see now that the special controller is required to take advantage of the two speeds.
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    2 Speed Xiongda hubmotor

    Here are the external dimensions of the 135mm and 145mm dropout versions of the Xiongda rear motors.
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    2 Speed Xiongda hubmotor

    The manufacturer's website is: http://www.xiongdamotor.cn/en/index.html. For sales information contact bonnie@xiongdamotor.com.cn. Back in September 2013 Bonnie quoted me $108 for the double-speed motor. I have not purchased one yet but may in the future. I found out that the dropout widths...
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    KT36ZWP controller And Tongsheng DG73626 hubmotor

    Lopine, welcome to Endless Sphere. Have you tried contacting Tongsheng Bicycle Co: http://www.tsbicycle.net? The controller was most likely manufactured by Suzhou Kunteng Electronics Co: http://www.szktdz.com/index.php. (Google Translate works quite well when viewing this Chinese site.) You...
  24. W

    XOFO making 250W geared hubs in cast 20-inch wheels

    Not yet Ron, it is on my list of things to do...
  25. W

    XOFO making 250W geared hubs in cast 20-inch wheels

    That was me with the burned-up XOFO torque sensor motor. My best guess is that the hall sensor wire insulation melted into the phase wires and screwed up the controller timing which in turn fried the motor windings. I told the vendor about this problem and he said it was fixed, but I have no...
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