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World Electric Vehicle Journal is published by MDPI from Volume 9 issue 1 (2018). Articles in this Issue were published by The World Electric Vehicle Association (WEVA) and its member the European Association for e-Mobility (AVERE), the Electric Drive Transportation Association (EDTA), and the Electric Vehicle Association of Asia Pacific (EVAAP). They are hosted by MDPI on as a courtesy and upon agreement with AVERE.
Open AccessArticle

Making the Impossible, Possible – Overcoming the Design Challenges of In Wheel Motors

Protean Electric Ltd, Silvertree, Unit 10B Coxbridge Business Park, Alton Road, Farnham, Surrey GU10 5EH, UK
World Electr. Veh. J. 2012, 5(2), 514-519;
Published: 29 June 2012
For many, in wheel motors offer a panacea for vehicle design. However history shows the delivery of an acceptable in wheel motor is a deeply challenging task which is dedicated to understanding aggressive torque and speed requirements behind demands on vehicle performance such as high speeds or sustained hill climb, and even aggressive driving, all of which are allowed by delivery of high continuous torque; limited in wheel packaging space, harsh environment, and safety requirements. Protean Electric is entirely focussed on overcoming these challenges and believes that, with its novel technology, it has delivered a product that will allow vehicle manufactures to exploit the benefits of in wheel motors. Protean’s in wheel solution is based on a direct drive, permanent magnet brushless machine with an outer rotor. High torque is delivered from a space envelope based on high ratio between the motor radius and axial length and the key to maintaining this high continuous torque is effective thermal management of the motor. Power electronics together with control circuitry is integrated into the motor architecture, while the wheel bearing provides the mounting point for the motor. This paper offers a holistic view of an in wheel motor design with special attention to overcoming the design challenges presented by harsh operating environments, high performance demands and safety aspects.
Keywords: in wheel; electric motor; safety; thermal transfer; unsprung mass in wheel; electric motor; safety; thermal transfer; unsprung mass
MDPI and ACS Style

Kostic Perovic, D. Making the Impossible, Possible – Overcoming the Design Challenges of In Wheel Motors. World Electr. Veh. J. 2012, 5, 514-519.

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