JOE SI

iTrader: (13)

When shimming a rotor ( 17.5 revtech ) I know it's best to get the rotor closest to the sensor without touching. When its at that point do I add shims on top to get rid of end play? Or just put the spacer and whatever it is, it is?

Josh-n-ya

iTrader: (95)

I sometimes add shims and that depends on the play. Ive also took a shim and wet sanded it down and put on pinion side.

big al

iTrader: (10)

why is it best to keep it close to the sensor? I assumed you would want the rotor shimmed so that it would spin in the space with the strongest magnetic field..

JOE SI

iTrader: (13)

Not really sure but that's what a few have told me and they've been around a lot longer than me and some built their own motors from scratch

Mr RCTech

iTrader: (2)

This is true.


Some Racers move the rotor closer to sensor when using a high torque rotor to adjust the power band.
Higher Rpms at the cost of some torque.

Its a tuning thing...

hotrod1933

iTrader: (8)

so does end float cause variance in rpm. some motors out of the box have like .030" float. should you always shim down to say 2 thou just a little to allow for rotor to grow with heat although can should grow quicker as it is alum.

another way to put question how does sensor count, off the rotor i assume. if so the better the gap error the more even the count

i normally just buy and run em.

ta04evah

iTrader: (2)

So do I until I take them apart for cleaning and then forget which shims go where...

I too was told to shim the rotor so that it sits within the magnetic field ,and allow a little free play for heat expanding etc.

Cheers
Rob.

WIITA

iTrader: (43)

I generally believe that the motor works the best when the rotor is centered in the magnetic field.
Here's my suggestion:
Place two .20 shims and one .10 shim on the sensor side of the rotor
Place one barrel shim on the pinion side of the rotor and assemble.
Spin the rotor and let the rotor center in the stator. Push the rotor twards the sensor. Spin the rotor again let center, then pull the rotor twards the pinion side. I usually shoot for a tiny bit of slop in both directions.

AMZ

iTrader: (6)

I think the above ,is your answer.

ta04evah

iTrader: (2)

Thanks, I tried that and got the rotor to be in the center of the magnetic field without rubbing against the sensor board.
Will see if it does anything to the performance of the motor on the weekend.

Cheers
Rob.

tdu verney

yep center the arm... It's how we did it back in the days of brushed motors, one of a few tricks to tunning a quicker motor...

HenBeav

iTrader: (13)

Closer to the sensor board adds timing if you are in a locked end bell situation. If not just shim it where it spins best.

Jethroz

iTrader: (54)

This is pretty much how I baseline all my motors. That small amount of force the rotor is placing on the shims causes friction. Friction = heat and less efficient. I've seen the top end on most 17.5 motors jump 1-2000+ rpm (*unloaded) just from shimming alone.

It's just one more of the small tuning things you can do to get the most out of your motor. I have went through numerous stators and rotors trying to pair up the best float with a rotor stator combo. Things really get expensive when you are looking to pair a matched low resistance stator and a balanced specific rotor which also have a good float.

idbdoug

iTrader: (41)

I know my fantom tuned motors usually have 2 shims which equal about 1mm on sensor board side. Any extra shims are placed on same side as barrell/pinion side of motor
If you r running a RevTech, be careful with going less than 1mm of shims on sensor board especially if u r running a 12.5HT. I fried/scrambled two sensor boards before realizing what was going on, not sure if same problem will occur with D3.5 or Killshot. Problem occurred because I was testing allot of different rotor combos in my Revtech but I would think u would still have the same issue on newer motors
idbdoug

Josh-n-ya

iTrader: (95)

The Higher the KV value the higher the RPM is what I have been seeing on a motor tester! When you adjust timing + those numbers increase. What is a good range for KV and RPM to be at to have a fast but torqy motor? How would you test for torque? Would using a High Torque rotor be the only way to increase torque? Also have been testing some rotors. Are the best rotors pretty evenly matched as far as + and - or do you want + value to be higher or lower? What are some good 12.3 rotor + and - numbers in HT, Broadband, RPM and the same question for 12.5 rotors.