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Whisper bus carries motors in its wheels, Professional Engineering, 15 October 2003, p 12

In the Netherlands,the e-Traction company has developed an in-wheel electric motor to drive its Whisper bus. Energy is supplied from nickel-zinc batteries that are recharged through a diesel-fuelled generating set designed to kick in when required to support propulsion. Two electric motor units, known as The Wheel, provide drive to the rear wheels. A tyre is mounted on the exterior of the motor which contains permanent magnets spinning around stationary electromagnets at the centre. A torque of 3634 to 6290 N m can be generated from each 120 kW unit, giving a maximum of 13600 N m. The energy efficiency of The Wheel is claimed as 90%, and the braking is regenerative.

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