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  1. T

    Motor controller with variable regenerative braking

    It is basically going to be throttle or regen, yes - no coasting. Motor 1 will activate torque sensor in Motor under test (motor 2), and Motor 3 will act as a generator. Motor 3 will get the whole brunt of Motor 1 and 2. Could do a simple 3-ph rectifier on the generator, making sure that the...
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    Motor controller with variable regenerative braking

    Hi, We are going to build 3 test benches for mid drive motors. My question is related to controllers with regen capabillity. I have used controllers from Sabvoton, Kelly and TIs Instaspin FOC development boards - most have been a simple coasting regen, where the instaspin board did full...
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    Stupid EGO batteries

    Test print a 1x1x1 cube on your printer. Measure the precision of your printer. If that isnt the reason why it wont fit: do some CAD Tutorials so you can make the bracket your self ;)
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    Axiom: a 100kW+ motor controller

    Go away, you are wasting everybodys time with your BS. You are wrong in your understanding of electricity. Open a new thread and be gone.
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    Sabvoton SVMC72060 Regen/Slide Problems

    Having the same problem with some SVMC 72100 Sabvoton controllers. Fitted with variable regen brake connector. Will not work as expected from programming. Can't get slide regen, general ebrake regen or variable regen to work. The brake signal is active when I hold it to VBat (which is ok), 5V...
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    QSMOTOR,0.5-12kW Electric Hub Motor & Mid Drive Motor Manufacture China

    Just verified that the hall-sensors in my QS single-side axle hub is wrongly connected. Applying 5 V to red and gnd to black, these voltages appear when spinning wheel slowly: Green: 0 - 2.7 V Yellow: 0 - 0.6 V Blue: 0 - 0.6 V Seems like the hall sensor hookup is wrong. Need to remove...
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    Sabvoton SVMC072150 controller review, variable regen *PICS*

    Got a pair of SSC 48060 controllers. Wrongly delivered without secondary 0-5V analog input for variable regen braking. New ones will be delivered, but looks like I will have to make-do with the current ones for a while. Is there any way to modulate sliding mode or regen braking? I have a...
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    Lacing 13G spokes into 8G/9G/10G spoke hole

    Drilled new holes, want to have a solution that lasts. One down, one to go :twisted:
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    Lacing 13G spokes into 8G/9G/10G spoke hole

    Hi, Long story short. Bought motorcycle style motor, custom made. Spoke holes are Ø4,2mm in diameter. Going to lace in bicycle rim. Ordered to length 13G spokes. I want to do this somewhat the right way. Problems: 1. Spoke hole too big, nipple falls through 2. Spoke "neck" too short in...
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    What Electric Automobile do you drive? Picture thread!

    VW E-UP! ZymlqWxwqNI Love it :twisted: Perfect city EV.
  11. T

    The limits of torque production for a given weight of motor

    One Norwegian startup tried to get rid of the gearbox and run windmills direct drive. Part of the invention was a stator and rotor supported like a bicycle rim, with spokes. One set to hold the rotor, and one to hold the stator. Regarding air-gap fluctuations due to shifts in wind and load -the...
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    500w BionX OFF ROAD

    I cringe at coming out in Bionx's defence, but that comparison is wrong. The 500W Bionx run somewhere around 1kW max and definitely has torque in the 50-70 Nm range. The same goes for their 250W system that peaks at around 1000 W. In the end, it boils down to watts delivered. Comparing a "1000...
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    The limits of torque production for a given weight of motor

    Ok. My understanding of motor design is that power production is a function of active area and magnet speed. Active area gives torque. Magnet speed supplies the necessary angular speed to produce power. Bigger diameter: more magnet speed - more power. Bigger active area: More torque As in...
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    Conclusive proof gearboxes are awesome.

    Your basic math is wrong when applied to brushless motors. Brushless Permanent-Magnet Motor Design by Duane Hanselman goes into the math and basics of motors wrt diameter, weight and power. Chapter 1.8 goes into detail of how motor torque can be calculated: T=k*D^2*L T=Torque, k = constant...
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    An ebike IS a "moped"

    Coming from Norway, this is an very interesting development in Finland. Can you elaborate on when the rule went into effect, and what affect it has had on ebikes in finland? What is MUT's? And does the 1kW e-bike have a speed restriction? The reason I ask is that I've heard some conflicting...
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    SAMSUNG INR18650-29E cycle test.

    The cells sat in storage for 1 year before I sent them to you electricbike. If cell 4 was affected by self discharge, it would have been dead. I also checked the voltage of all cells (3,703 V) before sending them out. Possible error sources are still external temperature disturbance and the...
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    QSMOTOR,0.5-12kW Electric Hub Motor & Mid Drive Motor Manufacture China

    Most likely contender is faulty wiring between controller and motor. Check and recheck phase wires and hall-signal wires. And if you don't find any fault, check again. What sinewave controller do you run? Since you mention hall-sensors I guess it's nothing fancy that will throw a fit if...
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    NMC Lithium modeling with dynamic data - megawatt hours!

    Background: 95% done with a Master in Industrial Instrumentation (EE with focus on sensors (Machine vision, FPGA, signal processing etc) I assume you have a dataset containing current, voltage and temperature with timestamp. From this, you want to quantify capacity and internal resistance...
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    SAMSUNG INR18650-29E cycle test.

    Great to see some data! I'd be fine if you added a full 4,2 V to 2,8 V discharge every 200 cycles for cell nr 3 and 4. You mentioned that temperature is logged - any chance cell 4 is put in a draft or similar (looks to be a cyclical event on a daily basis)? If you could post some more info on...
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    SAMSUNG INR18650-29E cycle test.

    Please, start a separate thread for capacity mapping and comparison between cells. It is a topic that poorly fits this topic. Looking forward to data from this test :)
  21. T

    Proven causes of battery cycle life reduction

    Source?
  22. T

    Friction Drive New Kepler carbon build

    I think the noise could be significantly reduced if the motor is ran with a sinusoidal waveform, but you've probably already considered that. If I were to go down the sinusoidal/FOC controller route - I'd buy the vedder ESC and tinker with that (up to 2kW able). Or I'd use more time with Texas...
  23. T

    Friction Drive New Kepler carbon build

    Inspiring Kepler, makes me want to build one myself. How is the sound? Compared to a Bafang BBS for example?
  24. T

    Samsung INR18650-25R cycle test.

    I'll send some 29E's your way, if I can have the last word in the different cycle regimens. Contact me on PM with adress etc if interested. I run 21S7P 29E cells. Max draw is about 100A, pack sags ~20V at this current level. 100A is about 5C. Most trips average 0,3 to 0,5C, so the 29E's are a...
  25. T

    My 14kw controller has landed :)

    More to it? How naive are you? You helped a chinese factory improve their product, to launch it to new markets. You spent your own money and 18 months of development time to do this. You hoped to be between the end user and factory - as a sales person and product developer. The normal...
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