Question on Electric motor sizes

I've seen numbers attached to motors, as in a "400 motor". What does this mean? I've also heard that the same motor may be called a 400 or a 370 depending on who's doing the calling? Is there a standard?



Reply to
Steve Williams
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No there is not.

400 refers to its length, which is more or less 40mm...

Its roughly a 100W motor if you push it, with about 50-60W output.

Sort of 020-049 equivalent.

Reply to
The Natural Philosopher

Unfortunately, there's no standard for aircraft motors. "400" motors are often Mabuchi 380s, which are made by the zillions for all kinds of cheap battery-powered appliances. They come in a variety of winds, and most of them have neutral timing.


Reply to
Morris Lee

But all of them are capable of delivering the same efficiency at the same RPM, and dumping the same amount of heat, which makes them the same power output more ore less, though volts and current at which they achieve it vary wildly.

The final power output of a motor is related to its physical case area (ability to dump heat) how hot you can allow it to get (cobalt good, neodymium bad, ferrite in the middle) and its efficiency, which is almost all about magnet type (neodymium good, ferrite bad, cobalt in the middle)

OK there are fine details in terms of reducing friction, and brush current ability at high RPM, but you don't stray too far from these fundamentals.

Apply the right voltage to any 380 motor to get RPM up towards 30K, load it till it gets to about 60C, and you will find the power input and output is pretty much the same on all the motor windings currently (sic) available.

Reply to
The Natural Philosopher

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