Recent content by S.B.D

Hey Walls, I am finding this thread very educational and learning a lot from it. Your design makes my DIY sensored BLDC controller look like a broken toaster.... :mrgreen: I'm just starting to understand sensorless detection methods. Can you give a short explanation on your BEMF detection...

Yesterday we assembled the ESC on an e-bike with a rear hub motor. The change to 5 Ohm gate resistors dropped the ESC temperature and even @ 40A it became only slightly warm. We did find a few bugs: - When the bike was moved in reverse the ESC acted as a brake. This is because of the current...

Hi Amberwolf, Thanks for the confidence builder. Just wanted to know if anyone finds a problem with this "multi-core" approach ... :mrgreen: My plan is to have the main ESC MCU deal with the current liming, PWM generation & voltage cutoff. Secondary (external) MCU will read the 3 halls and 3...

Hi, I had an idea for testing methods of BEMF detection using a sensored BLDC ESC. I would like to use an off the shelf sensored ESC as the power stage but connect an MCU to its hall sensor inputs. The external MCU will manage all the sensorless algorithm given by the throttle and BEMF...

Hi Tex, Thanks for the note. I have experience with temperature measurements with various kind of probes (ntc, pt100, thermocouple 2,3,4 wire) and aware of the problems with NTCs. I plan to port the code I used for a different project to read the same NTC. It uses a look up table every 5...

Hi, Last night we connected the ESC to my friend's home built 6S LiPo Scooter. This scooter uses an RC outrunner Brushless motor fitted with external halls. The controller worked great! The throttle endpoint adjustment via the USB interface was very simple. First we programmed the current limit...

Last night was a smokeless night. After fixing the controller we went on to use a current limited power supply and later on a fused 48V pack. After an initial power up with the power supply - limited to 30V we came back to the dreadful 48 pack. This time a 5A fuse was added :-) Everything...

Hi, Since this is our first attempt at a BLDC controller we would like to reach around 1.5kW @ 48V. Current goal is to understand why the input cap failed @ 44V input - no load... :( The design is very simple and does not implement synchronous rectification, so it will not be efficient enough...

Well, last night we continued working on the BLDC controller. The throttle bug is fixed and we now have a great working throttle with programmable endpoints. Next we looked at some scenarios where we saw jerking, mainly in very low RPM or "very" high RPM. I decided to try 2 things...the bad...

Liveforphysics sent me a PM with this exact part number. Apparently I did not go over enough ES threads... Thanks for the tip. I will source these next order from Digikey. S.B.D

Hi, Managed to find a decent amount of time to continue working on the BLDC controller. I found an burned battery charger in my junk and used its aluminum case as the ESC enclosure - perfect fit! Drilled the 6 mounting holes and added the FujiPoly thermal pad. For now I soldered the battery...

Hi, I am building a brushless controller these days and read this thread with great interest. Looks like have a major misunderstanding... As I understand 3 phase BLDC drive there should be no shoot through current in a 6 step drive scheme. Lets say high side MOSFET of phase A is turned on...

Hi, The MOSFETs I assembled are +STP140NF7​5;16 from ST Microelectronics. Same ones I used in the brushed ESC. S.B.D

Today, I placed all the TO220 components on the PCB bottom side. 12 x 75V 7.5mOhm MOSFETs 1 x high input voltage regulator 1 x voltage regulator 1 x reverse polarity diode Next up, wire the board and connect the PCB to a heat sink using a thermal pad. S.B.D

Hi, Found little time today to continue the board assembly. Finished soldering all the Through hole capacitors and 5W 1mOhm shunt resistor. Next up will be to add the 2 voltage regulators and 12 MOSFETs. S.B.D