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Old 11-24-2014, 07:18 PM   #1
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Default Brushless Motor Phases Important To A Motors Performance?

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?

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Old 11-24-2014, 08:02 PM   #2
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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.
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Old 11-24-2014, 08:12 PM   #3
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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?
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Old 11-24-2014, 08:32 PM   #4
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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.
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Old 11-25-2014, 01:13 AM   #5
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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.
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Old 11-25-2014, 03:35 AM   #6
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delete.
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