EDWARD2003

iTrader: (8)

I recently picked up a motor checker and checked my brushless motors. At hand I have a batch of 21.5's such as; D3.5, MMM, R1, Tekin, G-Style, and Orca. I did some timing tests for these motors and came across some motors with A B C phases that were out by only a 1 or 2 degrees. However, I had some motor phases out by 10+ degrees.

For example I've tested a motor with A 23* B 39* C 42*. As you can see there is a big variance in timing at each phase.

Now, does this matter in the motors overall performance?

DesertRat

iTrader: (2)

The short answer is yes, the difference in timing between phases will affect things like free-spinning RPM and amp draw, which translates into the power band on the track. You want all of the phases to be the same timing.

EDWARD2003

iTrader: (8)

Thanks. So if the hall effect sensors spacing is not 120* from A to B to C. Then how is the motor going to effectively detect the proper rotor position? Then how is the motor going to apply proper positive and negative torque?

EDWARD2003

iTrader: (8)

I did a test on a Team Powers Actinium 21.5 and it was by far the best motor. The phases were A51* B51* C50*. Cant get any better than that. Interestingly, the motor was very smooth and quiet.

Motors with greater variances in timing between phases sounded rougher and louder.

Roelof

So it is time the next generation ESC's do detect the timing of the sensors and put those parameters into the program for an optimised control.

Essnowyt

delete.