The lrk/sps principle used in these do-it-yourself motors, features a high torque at lower rpm, compared to a conventional brushless motor. There is no need for a gearbox, which means less weight, less $$$'s, no gear losses, no gear noise and no gear wear. The builder can tailor the motor to the application by adapting the number of windings. And he has the choice between a star and a delta configuration.

Outrunners are inside-out motors, the coils are stationary, housing and magnets rotate. This has the additional benefit of good magnet cooling and the coils are not stressed by centrifugal forces. The motors built to date, range from 20Watt to 2kW.

On the homebuilt outrunner homepage are a FAQ (lots of links and tricks, material suppliers) and links to the most important sites. There you can also join the technical e-mail discussion group there and read the message archive.

Met vriendelijke groet [img]i/expressions/face-icon-small-wink.gif[/img] Ron van Sommeren
near Nijmegen, the Netherlands