I took apart a brushless motor to find a core made of stacked iron plates. This material is rather dense and heavy for a motor made for aviation. What lighter, less dense material can a motor core be made of?


1 Answer 1


The lightest stator core material is nothing - literally.

In a coreless ironless motor the stator coils are wound around a non-metallic frame, glued to a surface, or even suspended in mid-air with the coils themselves forming the motor frame.

The motor below weighs 28g and produces 83W at 60000rpm (100W input power, 83% efficiency). The frame is made of plastic, and the rotor is a cylindrical Neodymium magnet. The only 'iron' in this motor is the shaft.

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Here's a tiny home-made motor which has a 0.5mm diameter rotor. The shaft and bearings are held in place by the windings. The black rectangle glued on top is an A1442 BLDC controller IC with built-in Hall sensor.

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  • \$\begingroup\$ Would you think it's possible to make one of these that is on the scale of about 1 HP output?? \$\endgroup\$
    – tuskiomi
    Commented Jun 30, 2017 at 13:05

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