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[Norman Castle]

Forgive my ignorance but until now I've never actually used a DC motor.

 I've just powered up my first build, which has an HPI 55T 500-size motor running off a 2S LiPo via an Mtronix Tio 15 ESC, and the motor seems perfectly happy both ways, and with and without load.  However, it emits a steady high-pitched note as soon as power is applied (i.e. even before it turns), the volume of which stays constant.

Everything else is exactly what I expected, so I'm a bit puzzled by this.  Any ideas please chaps?

[inertia]

Norman
This subject has been well covered in the past. There is nothing wrong here. The noise is the result of using a high-frequency speed controller and the only solution is to fit a low-frequency one. That will change the start-up whine to a low growl.
DM

[Norman Castle]

Much obliged, DM.  In my case, the solution is simply to ignore it now that I know it's normal 

[malcolmfrary]

I find the whine useful - it lets me know that the electric is getting to the motor.
Perhaps we should have a sticky telling about motor whine, it might save a lot of duplicate postings?

[inertia]

Perhaps we should have a sticky telling about motor whine, it might save a lot of duplicate postings?

I'll second that, Malcolm - and add a suggestion that we also have a sticky about BEC.
Dave M

[Time Bandit]

Norman
This subject has been well covered in the past. There is nothing wrong here. The noise is the result of using a high-frequency speed controller and the only solution is to fit a low-frequency one. That will change the start-up whine to a low growl.
DM

Or a "very" high-frequency ESC above 16 kHz, which at least I canīt hear anymore.
I build those by myself (< 20A) but (here in germany) are a few small series suppliers, which also build ESC with these high frequencies.
I personally like these here www.modellbauregler.de since they work perfectly.