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DSD 3-speed EV transmission with Oxford YASA axial flux motor to be integrated in Range Rover Evoque_e research vehicle
9 September 2013
|Compared to a single-speed EV or HEV transmission, DSD’s MSYS 3-speed system provides a 40% weight saving and 10-15% lower energy consumption. Click to enlarge.|
Specialist engineering consultancy Drive System Design (DSD) has been named as a member of the £16-million, 27-month Evoque_e program (earlier post) to develop new modular hybrid, plug-in hybrid, and battery-electric vehicle (BEV) technology.
DSD will be responsible for integrating high speed E-machines, clutches and clutch strategies associated with torque management and delivery to the wheels. The pure electric research vehicle will feature the company’s novel MSYS multi-speed traction system developed by DSD and Oxford YASA Motors (earlier post), which incorporates a three-speed powershifting gearbox and axial flux motor.
MSYS supplies 60 kW of continuous power alongside more than 2,000 N·m (1,475 lb-ft) of torque at the wheels in an extremely compact package. The integrated design of the axial flux YASA motor and multi-speed transmission provide opportunities to simplify the motor cooling system, electrical architecture and control system.
DSD says this technology can reduce the energy consumption of an electric vehicle by 10-15% compared with a single-speed EV or HEV transmission. As well as allowing downsizing of the motor, it extends the time the motor is operating within its most efficient region.
In the full hybrid vehicle, DSD will work closely with GKN Driveline (earlier post) to adapt the transmission to run with a new, ultra high speed motor, designed by Newcastle and Bristol universities with Motor Design Ltd and manufactured by Zytek using Tata Steel product supplied through their wholly-owned electrical steel subsidiary, Cogent Power.
The consultancy will also apply its expertise in transmission Noise Vibration and Harshness (NVH) to ensure that each of the powertrain options provides premium refinement without compromising weight or durability.
The consortium believes that the Evoque_E project will be the most comprehensive study of EV transmission options yet to be undertaken.
Other members of the Evoque_E consortium are Jaguar Land Rover, AVL, GKN Driveline, Tata Steel, Williams Advanced Engineering, Delta Motorsport, Motor Design Ltd and Zytek, supported by Bristol, Cranfield and Newcastle universities.
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