Powertrain manufacturer Vitesco Technologies is set to launch a range of externally excited synchronous electric machines (EESM) that do not require the use of rare earth metals and which are specifically designed for long-range, fast driving on highways.
The company notes that permanently excited synchronous machines (PSM) are the current standard in vehicle electrification. This is due to their high efficiency in city traffic or at medium ranges. However, it suggests that the general requirements for electric drives are changing: the range of battery electric vehicles is increasing, and on real long-distance routes with fast highway driving, externally excited synchronous machines (EESM) hold an advantage as at high speeds they are more efficient than PSMs.
In addition to efficiency at high speeds, externally excited motors avoid issues related to the price of permanent magnets, which have now risen to a 10-year high. In addition, the CO2 footprint of the drive is reduced due to there being no need for mining of rare earth materials.
Vitesco says that is preparing a portfolio expansion that will make EESM technology available on its already successful axle drive which incorporates power electronics.