Quote:
Originally Posted by BlackedOutREVO
I know most people here hate sensored, but I remember CC saying sensored was inferior and stuff like that, and then they make a sensored MM pro? WTF? What happened to all that was said about that?
|
Well, I'll explain why the MM Pro has sensors.
There is a governing body out there for racing (ROAR) that approved a particular motor (and ONLY that motor) for racing. The rules were written in such a way that only a particular design of motor was allowed for racing in four of the five brushless classes for 1/10th scale.
The motor that ROAR approved was poorly designed, performed horribly, generated very very little torque, had huge inductance, a rotor that was WAY too small, and a backiron design that ran in saturation ALL THE TIME.
The motor is so bad, in fact, that the back-EMF is tainted by the saturation levels on the iron, by the tiny rotor, and the lack of generated torque.
Because the back-EMF is so poor, it is difficult to start reliably with a sensorless controller. We have done a pretty good job, but racers wanted a little less startup hesitation on ROAR motors. So we added sensors to the MM Pro.
THEN, another company started using the sensors to push timing WAY up on those poorly designed motors. Because the motors had WAY too much inductance, pushing timing way up helped the poor little motors generate a little more torque, and pushed the Kv of the motors up. The timing was being pushed to a level that cannot be done without sensors (by using a software PLL --) And even though many of us complained to ROAR that this would start a war that would force those who race to use "sacrificial" motors (motors that would last only a few runs before dying,) ROAR decided that there were already so many people racing in these classes that it would be detrimental to change the rules.
So, the answer is: We added sensors to the MM Pro so that we could run a badly designed motor and push those badly designed motors to the destruction point -- all in the name of keeping racing "fair and level..."
And BTW, in our Modified motors and 1/8th scale motors (which ROAR now allows pretty much anything that fits in the right case size) you won't be seeing any sensors. The only motor that is so bad that it NEEDS sensors is the ROAR stock and super stock motors....