can someone post links so i can read up on fets? mainly what fets do. why they are stacked in mini-z's the different types. chooseing the right ones and possibly the drawbacks of stacking fets. oh and can fets be stacked on a brushless system? my main reason for learning about fets is that i have a mb-010 and i think with the 32t pn motor im about to fry the fets and if on my brushless mb-010 if it can handle the atomic 12000kv motor or if i need to ad fets. thanks all
Can't speak for the brushless, but with a 32t on a buggy, you should definitely have stacked fets. The buggy puts more load on the motor load due to the extra weight, which I turn will draw more amperage through the fets.
To put it in basic terms... Stacking fets spreads the load through the fet. So the more fets in parallel (how they are stacked), the less load each one handles.
if you want a more in depth definition, use that search button. This topic has been explained repeatedly by more knowledgeable people than I.
There's tons of info about fets for pre-mr03 boards.
That's when - from what I understand- installing fets did really matter.
MR03 boards can handle hotter motors but I support jdm when he's asking about brushless, I have no clue and would like to know. Is stacking fets on brushless helpful- in thinking buggy or ma020 cars.
Since I did stack a layer of fets just to try and found no difference whatsoever on a ma02 brushless... was I supposed to stack a layer onto the fets that are on the bottom side of the board as well?? I sort of guessed the fets on the underside were for reverse so I didn't bother but that might have been a mistake!
Electrically, the bottom fets are stacked with the top ones. They connect to the same traces, but are on the opposite side of the board. Adding one layer to the top essentially gives you a triple stack fets. Adding another layer to the bottom will give you a quad.
Being on opposite sides of the pcb, a stock asf/ad arrangement will offer better cooling to the fet than a single sided pcb with a dual stack. It also offers a marginal decrease in resistance due to the additional fet legs contacting the pads/trace rather than all current going through one fets legs to the pads.
__________________
EMUracing Micro RC Syndicate /DG Designs /GSR /Reflex Racing /Fast By Faqish /MurderTown Racing
Thanks for the very clear explaination!
Do you confirm that stacking fets on VE boards can be useful? As for me it made no difference. To be honest it was one of those impulse mods and i consider myself lucky I didn't ruin the board as I have no much experience in soldering!
Do you confirm that stacking fets on VE boards can be useful? As for me it made no difference. To be honest it was one of those impulse mods and i consider myself lucky I didn't ruin the board as I have no much experience in soldering!
Stacking probably won't do much for you with brushless. You may be able to get away with a heavier kv rated motor, but that won't change the switching speed of the inverter (controller). Stacking FET's was a big mod back in the older rev's of mini-z and when xmods were a thing. As previously mentioned, the MR-03's were impressive in how much current they could deliver. I didn't stack, but upgraded to heavier FET's and bonded a heat sink to them to draw out the heat. The benefits of stacking are limited. The circuit that turns them on and off can only provide the FET so much signal, and the more FET's you stack, the stronger the signal required to turn them all on and off.
looking for some info as well and didn't want to start a new thread. I have some stock ASF MR03 boards (RA22B w/tiki mode) and I wanted to put in a hotter motor than the X-Speed from Kyosho. Tried locating some R246 motors for NiMH to no avail. I think I saw some PN Racing S03 in stock but that is 39T motor. Do I need to have the boards FET modded to accept the motor? I saw some threads saying yes and then some websites saying the MR03 ASF boards can accept pretty much any motor.
Do I need to have the boards FET modded to accept the motor? I saw some threads saying yes and then some websites saying the MR03 ASF boards can accept pretty much any motor.
No! I've run the PN 32T on stock ASF MR-03 board with no issues, so you can run a 39T on stock ASF MR-03 board, but the S03 is a really old PN motor. I would recommend one of the newer ones. The PN 43T and 39T are good, depending on what you are looking for. I like the 35T too!
The Atomic Chili is one of my favorite motors out there for a large track and runs fine on stock ASF MR-03 board. If the F1 board has 2 pairs of FETs like the ASF 03 board, it should be fine. A 52T down to a 43T would be good for the F1 car.
[03/22/17] MZR was on vacation, didn't... : All kidding aside, the host experienced a bit of a server meltdown last week and efforts to restore the site to a new server took longer than anticipated.
The current server is temporary until - more»
[11/25/15] Did You Hear? Our Black... : Hey Racers,
We're getting started a bit early with our Black Friday sale this year. Generally we're not supporters of retailers opening early on Thanksgiving, but in our case, we're - more»
[06/30/15] shop.tinyrc.com: Have You... : Hey All!
Just a quick reminder to everyone that we post all of our shop.tinyrc.com Newletters here on the MZR Forum. If for some reason you miss them in your email inbox, you can always see the - more»