Finally got around to configuring the controller. I could not connect to the controller from an Android device so I had to borrow a winDOHs computer because the Kelly configuration program won't run from Linux. I guess they have never heard of Linux in China, and expect everyone else to use the same dodgy, insecure, closed source OS that they do. Anyway, I did a auto identification thing and also set the number of poles to 8. It was at 16. Enabled the joystick throttle. Set max battery current and a few other things. Then I immediately noticed a reduction of motor noise. Now measured 18" away from the motor at 100w the motor noise is 12dB above ambient noise level. At 250w it is 19dB. At 500w it is 27dB. A lot of this is shaft and prop noise.
Out in the cockpit, at 100w, with the hatch and dropboard completely open, I can't hear the motor at all. At 1kw, with the hatch and dropboard closed, I can barely hear the motor. Phone was at 1% and was on charge so I didn't measure noise level outside, but it was somewhere around 4dB I estimate.
So, the lesson from this is CONFIGURE that sine wave controller properly for the motor, and it will run way quieter than the square wave controller. Take advantage of the auto identification feature to get smoothest motor operation. With the controller properly set up, noise is cut in half, more or less, relative to the square wave unit.
I am also seeing about a 3% increase in efficiency as indicated by RPM/Watts.
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