Timeline for TVS diode across motor leads failing short. How to protect MOSFET from motor back EMF?
Current License: CC BY-SA 4.0
7 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Nov 7, 2022 at 21:01 | comment | added | user298907 | okay will try and let you know how it goes | |
| Nov 7, 2022 at 20:59 | comment | added | DKNguyen | @Erv A scope helps a lot so you can sort of trial values to see what the kick looks like since even with proper calculations you still need to fiddle with values a bit and observe the waveform if you're aiming for something optimal. | |
| Nov 7, 2022 at 20:56 | comment | added | DKNguyen | @Erv There is math if you have all the parameters (which you rarely do) and other methods that look at the ringing and spikes on the oscilloscope that you fudge number from. But it's not that critical unless you are specifically hunting down a particular frequency. In your case you just want a free wheel path so you just don't want too high a R or too low a C. So find the largest film capacitor for you rated voltage with some overhead and get a low Ohm resistor of enough wattage. Off the top of my head I would say try for 0.1uF and 1-2Ohms in a 5W non-inductive resistor. | |
| Nov 7, 2022 at 20:04 | comment | added | user298907 | how can I choose values for an RC snubber in parallel with the dc motor? | |
| Nov 4, 2022 at 19:05 | history | edited | DKNguyen | CC BY-SA 4.0 |
added 80 characters in body
|
| Nov 4, 2022 at 18:45 | history | edited | DKNguyen | CC BY-SA 4.0 |
edited body
|
| Nov 4, 2022 at 18:35 | history | answered | DKNguyen | CC BY-SA 4.0 |