Abstract: There is provided an electric motor/generator comprising a stator and a rotor. The stator has an outer perimeter. The rotor at least coaxially encloses the outer perimeter of the stator. The rotor is rotatable relative to the stator around a rotation axis. The rotor and the stator are separated by a flux bearing gap over which in working magnetic flux occurs. The rotor and the stator are separated by a protective gap. The protective gap is configured to close, during a deformation of the rotor, before the flux bearing gap closes, thereby avoiding closure of the flux bearing gap. The motor/generator is characterized in that the stator comprises a roller bearing and an axle. The roller bearing is coupled to the axle and rotatable around the axle. The axle is arranged off-center from the rotation axis. A distance between the roller bearing and the rotor defines the protective gap.

Abstract: The invention relates to a method of balancing a wheel assembly of an electric car, in which the wheel assembly comprises an in-wheel motor. The wheel assembly (with the tire mounted on it) is spun by the in-wheel motor, the imbalance is measured by a sensor on the wheel and the angular orientation is determined by an orientation sensor. A control unit in the car then determines the position and weight needed for balancing the wheel.

Abstract: There is provided an electric power supply system comprising a solar panel, a first battery, a second battery, a first converter, a second converter and a switching device. The solar panel generates electric power at a first voltage. The first battery stores electric power at a second voltage. The second battery stores electric power at a third voltage. In a first operation mode, the switching device transfers electric power from the solar panel to the first battery. The first converter converts the electric power from the first voltage to the second voltage. In a second operation mode, the switching device transfers electric power from the first battery to the second battery. The first converter converts the electric power from the second voltage to the first voltage. The second converter converts the first voltage to the third voltage.