🚜 Hörmann has been doing engineering work in the off-highway sector
They made a new wheel with hydrogen inside. It looks safer than a Zeppelin
🥦 It also has an electric reluctance motor inside the wheel
🥕 This gives a farm tractor the same range as a diesel tractor without adding any battery weight. Perfect
The blue part is the motor and the tube is the hydrogen storage. Both are fixed in position. The red rim with it's tyre is rotating around it [1]
A reluctance motor can deliver high power density at low cost. Bonus: it doesn't need rare earth minerals [2]
Reference 1. and 2. The screenshots are from Hörmann's white paper "Power im Gelände"
Johan Empa