In view of Rowena’s recent comments on electric bikes, I thought that you might be interested in an article about Magnax axial flux motors, published in New Zealand. If they can achieve these power-to-weight ratios on a production basis it will be a real game changer. You could build the rear wheel of a bike around one of these, and with no transmission the space between the wheels could contain as many batteries as weight would allow. Alternatively, you could build it into the front wheel and get some very interesting handling.
Roy Cross, member
I took a look at the Magnax page. Although the technology is way beyond my ken, their claims for the yokeless axial flux motor compared to the current (ahem) BMW radial flux engine are eyeopening. The same 250Nm or torque, a 36% power uplift and 14kg instead of 41kg. That could be truly useful on two wheels… Say. Did I ever mention that my grandfather held several patents for cooling systems on electric motors? And he rode a Rudge. What a Top Chap! Rowena