https://www.osti.gov/biblio/871313
A new configuration of DC motor/generator is based on a Halbach array of permanent magnets. This motor does not use ferrous materials so that the only losses...
halbach arraydc motorgeneratorpatentosti
https://www.instructables.com/600-Watt-3d-printed-Halbach-Array-Brushless-DC-Ele/
600 Watt, 3d-printed, Halbach Array, Brushless DC Electric Motor: This is a very powerful, 3d-printed brushless DC electric motor. It has 600 Watts, and...
dc electric motorhalbach arraywattprintedbrushless