Re: [electricboats] First run

On 1/9/20 3:11 am, MATT wrote:
> What surprises us the most is the very high pitched whine that comes from the motor.  It's far from silent.  I don't know if it's normal or if maybe the belt is too tight.


Some people are more sensitive to the high frequency switching noise than others. I can hear the switching noise on my boat (DC perm mag motor, direct drive). Actually it must be a harmonic I hear as there is no way I could hear the fundamental switching frequency from the transistor drive, that frequency is way to high for human ears.

I can pretty well tell who manufactured the traction package of electric trains I board (if on the motor coach) by the changes in pitch from the traction package as the train accelerates. Each manufacture has a distinctive sound.



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