Search results

Date Relevance Most replies

  1. G

    Lebowski Controller Brain

    Hi All, Been away for a while. I'm wondering if the lebowski controller is still available to be purchased. All I require is the control board/uC as I want to make my own power stage. Thanks
  2. G

    DIY BLDC Controller Wave forms + Snubber

    Yes definitely in the P3 there will be a dedicate heat sink. however I think the P@ can still take a fair amount of current with the power plans as makeshift heat sinks.
  3. G

    DIY BLDC Controller Wave forms + Snubber

    So here is Prototype 2 (P2). She is working :) It is a 4 layer board whose FET layout is inspired by Vedder. Got total isolation from the logic side to the power side. This includes isolated current sensing as I am using Hall effect current sensing. Was my first time soldering QFN packages so I...
  4. G

    Help me Identify how many pole pairs this motor has

    So the pole pairs is the number of magnets/2?
  5. G

    Help me Identify how many pole pairs this motor has

    Hi, So I am trying to find out how many pole pairs this motor has
  6. G

    How do I diagnose my battery (random shutdowns)

    Bro I feel your pain its infuriating with this stuff. Quick tip if you want to probe the balance leads just grab a single strand wire used for hobby electronics and shove it in the jst connector for easy probing. From what I can gather from scrubbing lightly through your ordeal, it seems...
  7. G

    DIY BLDC Controller Wave forms + Snubber

    I already hooked a motor to it and it works well! Now I just need to construct the new smaller board and see how it works.
  8. G

    DIY BLDC Controller Wave forms + Snubber

    Wow thanks for that link! In my eyes that is such a complex way of doing things, discrete components everywhere rather than using and integrated gate driver for example like I did. I am sure the way they did it is a lot cheaper since the gate driver alone costs 5 euros each and I have isolated...
  9. G

    2 different current sensors for low rpm Sensor less control

    So correct me if I'm wrong but in sensorless control using space vector modulation you measure the current to know the rotor's position and hence you can know how to drive it As I underetand At low rpm the problem is the current is small and hence you cannot measure it properly. To solve this...
  10. G

    DIY BLDC Controller Wave forms + Snubber

    Yes definitely the best way to do this is to solder actual probes on where you are probing and having short leads as you said. No I will do exactly what you said, I will connect two phases of the motor as the loads and will start at lower DC link voltages for safety.
  11. G

    DIY BLDC Controller Wave forms + Snubber

    Hey Fetcher thanks for the response. I added 100nF ceramic caps across each half bridge and it worked a treat! Thanks so much! The previous voltage spike was almost 60V and now the voltage spike is barely over 48V! So that is a huge improvment!! Open the images in another tab to see the...
  12. G

    DIY BLDC Controller Wave forms + Snubber

    Thanks I will give it a shot!
  13. G

    DIY BLDC Controller Wave forms + Snubber

    Hi all, I am doing my final year thesis in electronics and control. I have built a prototype board for my BLDC motor controller. The board has a lot of test points and jumpers so I can manipulate components in and out of circuit to see what effect they have on the wave forms. What I want to...
  14. G

    Snubber Design for Controller Choice of Capacitor and Power

    Hi thanks for the reference, I have read the datasheet you link and found the snubbers you are talking about. Now I am bit confused as to where to apply them, across high side fet only, low side fet or across both ? I am thinking it should be applied across both since I do not want to experience...
  15. G

    Snubber Design for Controller Choice of Capacitor and Power

    1) You're right about the size of the ca0s. In the example give and others I've looked up the sizes are small so it is not a problem. 2) So after determining the parasitic cpaacitance and inductance, I can stimulate the circuit with those values and determine the power rating required. 3) So...
  16. G

    Snubber Design for Controller Choice of Capacitor and Power

    Hi All I am desgigning my own 3 phase motor controller. I want to implement a snubber circuit to Protect the FETs. I will use and RC snubber circuit since it is simple and effective, even though it has quite low efficiency (approx 40%-60%). I have found this application note which is great and...
  17. G

    DIY Custom Conttroler Version 2

    So its been a long time so here are some updates: I have successfully made a circuit using the IR2184 Driver using the bootstrap driving mode. The circuit works flawlessly however I have limited the PWM from a range of 10% - 90% to allow the capacitor time to charge. My mentor however...
  18. G

    DIY Custom Conttroler Version 2

    Thanks for the suggestions but I am going to do this for my thesis. I also plan to go into detailed hardware design and yes I will use sinewave instead of 6 step so it is a bit better. I also have some good ideas on the firmware and customising the controller through UART like PID control etc. I...
  19. G

    DIY Custom Conttroler Version 2

    The third year is over. I have finalized my first prototype of the MOSFET gate driver board as seen below. In the top layer there are IR2308 MOSFET drivers which have integrated dead time to avoid MOSFET shoot-through. I will be using a 30 kHz switching frequency. Therefore I will use a 22uF...
  20. G

    DIY Custom Conttroler Version 2

    Could it possibly be due to placement? Maybe thr only spac was next to an inductor which would affect the accuracu of the ACS due to the magnetoc field?
  21. G

    DIY Custom Conttroler Version 2

    Well done man that's quite an awesome build you have there. Yes the ACS have a problem with magnetic fields. I really like them because they are really simple to use. I may however go with a shunt but that requires opamps and other stuff which makes it more complicated.
  22. G

    DIY Custom Conttroler Version 2

    Oh I think I figured out the way you are doing it. Thanks for your feedback man
  23. G

    DIY Custom Conttroler Version 2

    HI thanks.Yes I think I have the numbers are right. I will be using 30 kHz as my switching frequency and from the research I done it seems that it is the main driving factor regarding capacitor size. Do you have link to your project? I love looking at what other people do. As far as current...
  24. G

    DIY Custom Conttroler Version 2

    @casainho: That's a very neat way of doing things but when you are applying the PWM to the input pin of the driver, when the PWM is in the low level state won't the lowside Mosfet switch on?
  25. G

    DIY Custom Conttroler Version 2

    Wow nice job!! You are using the IR2148 and it has only 1 input signal which truns the high mosfet on and the low mosfet off. When you are applying PWM to the mosfets wouldn't it be switching on 2 phases with the PWM? I see some people using this Driver but I can't figure out how they do it with...
Back
Top