1. B

    Fan Controller - Thermistor Circuit

    Hi folks I am trying to build a circuit which will govern the speed of the fans in my solar cabinet based off the temperature inside. https://www.circuits-diy.com/temperature-controlled-fan-using-555/ I built this circuit hoping it would work with 6x 24v / 0.08A PC fans (40mm) I have 3 of...
  2. A

    HE sensor and Potentiometer together

    Can I use HE and potentiometer together for feedback on a linear actuator? What are the benefits of using both methods?
  3. flash23131

    DIY BLDC controller circuit

    Hello! I want to make an electronic circuit to control a 36V BLDC motor (three phases, hall sensored). I made three half-bridges (like the ones in the picture) for the three connection wires from the motor. I control the bridge with the help of an arduino through the IN_LO and IN_HO pins. At the...
  4. J

    BLDC motor open circuit effects

    Hi I am trying to use a BLDC motor as a generator using the regenerative braking function. I have a situation where I need to be able to spin it while the e-lock is on, so I am thinking of using relays to open circuit the field windings while I do this. When I close the relays, I want to be sure...
  5. E

    Help me understand this BEMF measurement schematic

    This part of the schematic from the STSPIN32F0251 EVB allows the user to select between various commutation inputs to operate a BLDC motor in sensored and sensor-less modes. Can anyone help me understand the BEMF measurement part? Also, how is that all the inverting input of the opamps come from...
  6. M

    position of hall sensor in bldc motor

    Hello all, I'm trying to create bldc motor, and have some problem regarding position of hall sensors. It is 12 pole winding on stator, and 8 pole magnets on rotor, and 3 hall sensors. But I am not sure where to locate this 3 hall sensors... i tried locate them on every 120 degrees, but i'm not...
  7. S

    Solution for Inductive spike from BLDC motor

    Hi, i want to build regenerative system in my electric scooter, i try to rectifying back emf of three phase wire and convert it with dc/dc converter then save the power in supercapacitor. But when i try this, my mosfet was broken, because the inductive spike from bldc motor, for several time it...
  8. Lawrence White

    Struggling to get this MC33035 to work, can anyone help at all?

    Afternoon everyone, Getting rather frustated with somethign that seems straightforward to me... I have researched and corrected any mistakes I have made, done a rebuild several times, but can never get this thing to work. draws about 10mA on a 12V test voltage and thats it. nothing seems to...
  9. C

    Areas of improvement in Field Oriented Control (FOC) ?

    Hi everyone, I am trying to a project based on FOC and BLDC motor using Simulink. I have been looking at material explaining how to use FOC with Simulink but from what I have seen there is an automatic PID autotuner. So is there really anything that can be improved from FOC in MATLAB ? Thanks...
  10. C


    Hi everyone, I am a final year student who is making a dissertation on Field-Oriented Control (FOC) with a BLDC motor. I am having the issue that with the virus outbreak I have had to modify a lot how to carry out my dissertation. As a result, I do not know what to write about anymore. I would...
  11. C

    BLDC motor torque control using current measurement

    I would like to control 18V BLDC motor of battery powered drill. What I want to do remake the drill to nut runner (torque wrench), so I need to sense a motor current which is proportional to motor torque. My controller will include microcontroller. Here are some questions: How battery voltage...