Dr_T

Interesting read here guys, I really like posts like this that help understand the principles behind electric motors, thanks Howard.

I don't race, but I have been looking for a "real" dyno set-up too for measuring output Power (T*omega) of PMDC motors up to 1/5 scale; haven't found any ready made solutions for it. Some guys use a flywheel set-up, but I'm not a fan of it and you won't be able to use that directly with a motor analyzer like this, as you need to carefully register acceleration as funtion of RPM, in order to derive Torque as function of RPM. Best bet for a proper dyno seems DYI-ing a de Prony brake of some sort:

http://my.voyager.net/~jrrandall/Pro...ronyBrake.html

dragonracing

iTrader: (7)

Dont modern dynos use hydraulics for the measurements now? I thought i read that somewhere

patorz31

Terry I have one on order you can fondle it in person, in a bit.

THEBIGBULL

iTrader: (5)

KOOL thanks....

Dr_T

You mean for real cars and heavy machines? Quite likely. Not sure though how you could use that to make a simple RC motor dyno for measuring Torque vs. RPM.

bpalmer

iTrader: (1)

using slave motor to simulate load

http://s42.photobucket.com/user/bpal...9.jpg.html?o=1

http://i42.photobucket.com/albums/e3...pscb489f0c.jpg

Sean B.

iTrader: (13)

I see Trinity sells these now. Not sure if they have the updated ones or not.
Any ETA on getting stock in at EAM?

EAMotorsports

iTrader: (79)

Should have some more in late next week.

Thanks
EA

DesertRat

iTrader: (2)

You probably shouldn't rely on those wimpy clips for doing more than 5-10 amps, or your data will be erroneous.

dragonracing

iTrader: (7)

Got to drop my good novak 25.5 motor on one this weekend. i dont remember the rpm's but it pulled about 2.5A the was 2045 and the timing was set on the sticker at 45` and it measured an average of 49` the stator was 47/48/50. pretty close but could be better. dropped my trackstar 17.5 on it also and was pretty disapointed in the results. not going to run that motor again. lol. watched another motor got checked and it was almost perfectly timed and the stator was almost dead on. pulled good amps too. going to have to buy one of these soon.

Chris Brown

iTrader: (19)

I just got the Trinity one in the ail today and it goes up to 70 degrees of timing.

Dr_T

Nice, is that your set-up? What Resistances do you use on the slave motor, variable? Also, what is your aim in measuring there exactly, motor's Current load as function of RPM?

bpalmer

iTrader: (1)

At this time it is a 19t brushed motor that i use only to simulate some type of a load. I feel better about not free wheeling my motors,and I am more interested in what my motors do under a load . I can also get voltage output from the slave motor as well but I think that may be a little redundant given the numbers i can get off of the dyno. I also wnat to change the A B C wiring on the dyno to get rid of the gator clips and to run the same gauge wires as what i run on my esc. Any input is ..as always very much appreciated.

Jochim_18

iTrader: (10)

I don't like checking without load so what I do is just leave the motor in the car with the tires on and I check it that way you get a more accurate reading. Checking the motor with no load for me does not do anything.

Carnage9270

iTrader: (6)

The only thing that I can think of would be the QTEC power terminals that Reflex sells. It's the only thing I can think of that gives a nice solid connection that would be quick without having to solder every time.

https://reflexracing.3dcartstores.co...nals_c_76.html