I am trying to drive a 350 watt, 3 phase, BLDC motor (DGW07-20j model) with stm32 micro controller. But I have problem with hall sensors because their outputs are not similar to the hall sensors which I have seen on the internet.

hall sensor on oscob I connected the sensor supply to +5v dc (according to the sensor pcb guide). Then I connected two of hall sensor outputs (2of3) to the oscilloscope channels which is shown in the following picture.

motor  pcb Unfortunately, I couldn't find the model number of hall sensor or related data-sheet. But I connected the supply and outputs based on printed pinout guide on pcb. You can see these connections in this picture... The motor was working while I captured the hall sensor outputs but clearly not not in a good way because the switching phase timing should be adjusted using hall sensor outputs.

many thanks

other timming hall sensor on oscob


After three days hard working for this problem I found the answer! By adding an RC filter on each hall output I see the right signal.

https://i.stack.imgur.com/yXvEg.jpg enter image description here


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