Permanent magnets are expensive and their avoidance allows European manufacturers to use only well-known and (relatively) cheap engineering materials (e.g. steel, copper), reducing the total cost of the motor.
Permanent magnets have risk of demagnetization which can generate performance variations at elevated temperatures. Magnet-free designs can offer steady behavior, practically unaffected by exposure to environment conditions and/or external magnetic fields, thus more reliable for their integration in EVs.
The electrical machine’s assembly process must deal with magnetic fields in the presence of permanent magnets. This may lead to increased failure in assembled motors. Magnet-free designs could simplify this process as there are no magnetic fields and assembly process could be significantly simplified.
VENUS project aims to develop a novel electric drive system for EVs, (i) free of rare-earth magnets, (ii) which meets EV performance requirements (efficiency, power density) and (iii) that is feasible for mass-production.
In order to achieve that, VENUS will develop an axial-flux variable-reluctance machine, SRM or PMSynRM:
Axial-flux PMSynRM is a completely novel configuration for any application, combining already known advantages of radial-flux PMSynR machines with the torque increase and advantageous pancake shape of replicas relojes axial-flux configurations, although it requires quite complex manufacturing.
However the raw material dependence problem of the EU is even more worrying when it comes to the electric motors themselves replicas de relojes rather than their batteries. Currently, the most powerful and efficient electric machines use permanent magnets composed by rare-earth materials such as neodymium and dysprosium.
The problem is that 95% of the global supply of these materials is provided by China only which puts at risk a mass introduction of EVs in Europe if the current motor technology is exclusively embraced. In order to establish a successful large scale EV manufacturing industry in Europe a new necessity arises: finding an efficient and power dense alternative to permanent-magnet machines.
This project has received funding from the European Uniona��s 7th Programme for research, technological development and demonstration under grant agreement No 605429.
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