Pricey but tempting: the business case for in-wheel motors

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In-wheel motor maker Protean reckons it will be a £17 billion market by the middle of the next decade

On a corner of the Renault Group stand at the recent Paris motor show stood the perfect use case for in-wheel motors. The company had stripped the body panels from its new Duo/Bento quadricycle – the replacement for the Twizy – and a large caged area between the rear wheels, incorporating the e-axle with an electric motor and driveshafts, was visible. Without that, the Bento van version could have repurposed the space to vastly increase its luggage capacity.

For example, THK’s Enemo variable-flux motors, pictured below, decouple the stator in a version of cylinder deactivation to avoid the problem of creating electricity at high speed. DeepDrive’s set-up has a dual-rotor system, with the stator driving both rotors and increasing the torque to a claimed 1770lb ft, even more than the 1500lb ft Protean measures from its 138bhp motor.

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