Neumotors 4606M Multirotor (Baureihe)

The Neumotors 4606M series is a US-developed family of 46xx outrunners for multicopters with 24 slots and 22 poles. Neumotors is a US motor maker. The motor weighs 94 g, has a build length of 22 mm and a 6 mm shaft. The family comes in around 50 windings, with KV values from 60 to 11,917, so the speed can be matched to the operating voltage.

Neumotors quotes 500 W of continuous power and 1,000 W of maximum power. That is about 10.6 W of peak power per gram of motor mass and 5.3 W in continuous running. The maximum speed is 12,000 rpm. This shows how to choose the winding: the product of KV and operating voltage should not exceed that limit, so at 24 V the KV must not be above 500, and at 12 V not above 1,000. Choosing the winding also settles the current, because at fixed power a lower voltage needs more amperes.

The 1,000 W holds over a motor temperature range of 20 to 100 °C, not for a fixed time span like the second-based values of other makers (3 to 180 s); a comparison with 3 s or 180 s values therefore makes no sense. The frame of the part type includes matching motor, speed controller (ESC) and battery to the same cell count. For the rules the take-off weight of the whole drone counts: the EU classes C0 to C6 follow it, not the motor.

In a motor that turns up to 12,000 rpm, bearings and balance are the wear point: roughness, noise and vibration indicate damaged bearings. The winding ages when the motor temperature stays permanently in the upper part of the 100 °C range; discoloured varnish is the sign. Shaft wobble, magnet seating and the phase resistances should also be checked. Anyone choosing a winding should fix the operating voltage before ordering.