These Mars motors are sometimes call BLDC or brush-less DC motors. It is technically more accurate to refer to them as PMAC or permanent magnet AC motors.
Here is a description of the differences between the two motor types:
"Although BLDC motors are practically identical to permanent magnet AC motors, the controller implementation is what makes them DC. While AC motors feed sinusoidal current simultaneously to each of the legs (with an equal phase distribution), DC controllers only approximate this by feeding full positive and negative current to two of the legs at a time. The major advantage of this is that both the logic controllers and battery power sources also operate on DC, such as in computers and electric cars. In addition, the approximated sine wave leaves one leg undriven at all times, allowing for back-EMF-based sensorless feedback."
Eric
Marina del Rey, CA
--- In electricboats@yahoogroups.com, "hardy71uk" <p0054107@...> wrote:
>
> I am not familiar with these motors and hope this is not too obvious but usually one must remove the brushes first if it is a brushed motor.to avoid fouling on the commutator
> Chris S
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