Brushless Permanent-Magnet Motor

Electric machine · 1962

Year: 1962
Kind: Electric machine
Materials: Neodymium–iron–boron magnets with dysprosium for heat, copper windings, silicon-steel laminations.
Efficiency: 90–97 %.
Used In: Electric cars, drones, e-bikes, hard drives, cordless tools.
Power Density: The highest of any motor: kilowatts from something you can hold.
Cycle: None

How It Works

Permanent magnets on the rotor, electromagnets in the stator, and an electronic controller that switches the coils in sequence as the rotor turns — the commutator's job done by transistors and a position sensor. Rare-earth magnets made it powerful; cheap electronics made it universal.

Equations

Faraday's Law of Induction Lorentz Force Power Torque

Skills

FDM 3D Printing

Elements

Neodymium Copper Iron Boron Dysprosium

Referenced by

element

Boron Copper Dysprosium Iron Neodymium

equation

Faraday's Law of Induction Lorentz Force Power Torque

skill

FDM 3D Printing

Open on the Machines shelf — the interactive card, the filters, and everything alongside it.

From the Machines database in Notion, last edited 2026-08-18. This page is the row, rendered by the build; nothing on it is written by hand.