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  1. I

    Nanjing far driver controllers

    Based on your suggestions, I looked into a Votol vs Fardriver comparison as well. The channel ‘ev components review’ has a teardown of the Votol Em-150 as well as of a Fardriver controller. The Votol controller looks very nice indeed. Only small modifications needed to make the power...
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    Nanjing far driver controllers

    Yes, be careful with field weakening and no load testing of controllers + motors, that is a very useful warning for everybody. For that reason, i have set a max speed limit of 95 km/h in my cycle analyst (piggy back control system for ev controllers), so that the motor will never spin beyond...
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    Nanjing far driver controllers

    600 phase amps for a 24fet sabvoton is rather amazing; that is 150 amps per mosfet! I usually stop at 100 - 120 phase amps per mosfet and some 70 battery amps per mosfet. I never blew a MOSFET during active duty though; only during testing of firmware settings. Did you modify your sabvoton...
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    Nanjing far driver controllers

    With respect to the slow rise of phase amps: with my sabvotons, i found that after startup the first acceleration is slow; it almost seems like the controller is first trying to find the correct phase angle compensation? At least, that is my interpretation of what is happening. But after this...
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    Nanjing far driver controllers

    Ok, that is useful feedback, thank you. Currently, I ride ebikes that weigh between 35 kg (carbon mtb) - 60 kg (alu daily driver). For that category, the kt and sabvoton controllers configured around 15 kW are a very nice fit; I don’t feel i need much more than that (more phase amps only results...
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    Nanjing far driver controllers

    I was considering buying a qs 180 90h + nd721800 or nd961800, but seeing all the trouble with you guys not getting to work your fd controllers properly (slow ramp up of phase amps, jitters and judders at top speed, regen voltage problems) makes me hesitant. Do any of you have success stories...
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    Max safe Flux Weakening

    Although I can understand your reasoning, I do not agree. It is too narrow of a view. To me, both regen and flux weakening are just extra design options that you can use when building your ideal ebike. To start with regen: regen is actually very useful and effective when you use it for what it...
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    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    We would miss you and your dedication Stancecoke! Is there no way to keep you interested in the KT controller? Maybe some sponsorship with an 18 fet controller :wink: :wink: ? It may be a simple controller, but it is also very tuneable and nearly indestructable. Currently running my 18 fet 72v...
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    where can i buy a quality 72v controller?

    I still get mine from AliExpres. VAT is now included in the price, and customs don’t charge any additional costs in my country. Ali now has a lot of warehouses in europe to help prevent additional costs. If you look carefully, you can still find the 18 fet 72v controllers around 80 euros during...
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    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    Ah, ok, then it makes more sense. Where do you plan to put the hc-05 module? I think it should be outside the controller or else the radio signal will be shielded by a farraday cage. The way i do it is as follows: as said before I use a 15/12v buck converter that powers the 15v rails. This is...
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    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    Of course you could supply 5v separately but I have personally never felt the need to do so. For stability and reliability during high loads (and corresponding large+quick voltage drop) I would highly recommend to use a buck converter for the 15v rail, just like you already do. The existing 5v...
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    Cycle Analyst V3 preview and first beta release

    I don’t know if this answer is really what you are looking for, but maybe it helps: Grin tech has a pdf file that describes how to implement a digi-aux on 1 analog input signal, using a combination of resistances and schottky diodes to create different ‘regions’ of operation. Your third button...
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    Cycle Analyst V3 preview and first beta release

    The bike is actually still a very normal looking and riding bike with 7 useable gears (60t chainwheel, 11t smallest at the rear). I can pedal with proper cadence from standstill all the way to 85 km/h. The throttle is not touchy at all; with the right settings it is very controllable from...
  14. I

    Cycle Analyst V3 preview and first beta release

    :D 8) :bigthumb: :bigthumb: And the safety features/net will be useful for every other bike as well of course
  15. I

    Cycle Analyst V3 preview and first beta release

    Great to hear that at least you guys are willing to provide a helping hand!! I guess we will have to find some kind of work-around for the power surge issues, without dev support. Besides the pass through open loop solution that we discussed before, what would also work in my opinion is if we...
  16. I

    Sabvoton Controller Modification

    Also interesting to hear if the case temp (higher?) and the controller temp (lower?) reported by the MQCON software change as a result of improving/fixing the thermal interface by adding more heat paste. Did you see where the temp sensor is located? Hopefully at/near the mosfets? If temps...
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    Sabvoton Controller Modification

    Looks promising! Did you try it yet? I do not feel the need yet to modify mine, as 8+ kW is enough for my modified ‘normal’ ebike. Surely with 130 battery amps and 350 phase amps I am already pushing the limit of my shunt modded BMS that was originally rated at 60 amps max… ;). But always good...
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    Cycle Analyst V3 preview and first beta release

    Bump! Why is none of the developers responding to the power surge issue, which is clearly a big and common issue? The solution is also very clear: please implement the possibility for a torque sensor to directly control the throttle out voltage, without any feedback loop. Just like a normal...
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    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    :bigthumb:
  20. I

    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    Great, thank you for this detailed explanation! So if I understand correctly, I should look in your fork where the constant is defined (the line: float flt_s_motor_constant = 1.5) and then change that constant in whatever constant I have determined myself. Btw: i am doing this for the lcd3...
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    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    Stancecoke, i would like to experiment with the pwm off during coast option.i have searched this forum but cannot find a detailed description of the steps that one needs to take to set this up for a specific motor. could you provide a bit more detailed description of how to determine the motor...
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    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    Maybe it was punishment, maybe it is a chance to finally experience the kt controllers with custom firmware in all their customizable glory and have cheap yet powerful controllers available to you for the rest of your life (as long as china provides them) ;)! Anyway, regen should be able to be...
  23. I

    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    I am also thinking about upgrading the irfb4110 mosfets on a blown controller that I received from someone else. I am interested in the csd mosfets that keep popping up in this forum every now and then. I understand that Honya96 did some experiments some years ago but was not successful yet...
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    Cycle Analyst V3 preview and first beta release

    In addition to my previous post: when I think about it, I think the open source custom flexible firmware for KT controllers that was developed by Casainho, stancecoke and Xnyle actually does this perfectly: - you can use direct torque pass through - torque support starts after a minimum cadence...
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    Cycle Analyst V3 preview and first beta release

    Hi Limbs, Just saw your response now. I will try that combination as well. With respect to the ‘customizable pas timeout’ that I was asking for: I found that it is best to always use 1 pulse averaging, because the timer seems to multiply with the number of pulses you select. So the pas...
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