Emitech's EMCEM (ElectroMagnetic Characterization of Electrical Motor) test facility aims to characterize an electric vehicle motor from an electromagnetic compatibility perspective. It is the result of the know-how of the various subsidiaries that make up the Emitech Group. One of the operational branches, works on current and future mobility solutions. Its expertise in the design and validation of electric, hybrid and traditional powertrains has led to the development of highly dynamic benches that simulate the entire powertrain as well as the road profiles required for the various design and validation stages. The second operational branch of the Group corresponds to the various laboratories and engineering services whose purpose is to qualify equipment in relation to its expected life profile or to homologate the equipment. Among the areas of expertise is EMC or Electromagnetic Compatibility.
The synergies between these areas of expertise have resulted in the new EMCEM test facility, which is unique in Europe.
On-board electronics and power electronics are two major components in the mobility sector. The electrification of powertrains is evolving rapidly and technical progress as well as environmental and economic issues are creating strong dynamics. This evolution is reflected in a strong demand for expertise and testing of electric motors for the automotive and aeronautical industries. The Emitech Group is supporting this demand through important investments, including the one dedicated to this state-of-the-art facility integrated into the automotive laboratory at Montigny Le Bretonneux (near Paris). The EMCEM installation allows the implementation of complete EMC test campaigns on high power direct coupled electric motors. The system enables the electromagnetic compatibility (EMC) of an electric motor to be characterised in operation, more precisely in the operating mode that a customer wishes to explore. The purpose of this characterisation is to ensure that in its various modes of operation, at low or high speed, this motor does not contribute to the deterioration of the electromagnetic environment characteristic of a vehicle and, conversely, that this same electromagnetic environment does not influence the expected operation of the motor and its control systems.
The installation consists of an EMC neutral and transparent rotating engine test bench installed in an automotive Faraday cage that complies with the CISPR25 standard. The dyno is capable of reaching 21,000 rpm at 510 nm of torque. A filtered power supply is provided in the cage.
Outside, a high-power battery simulator (250kW - 1000V max - 1000A max), a filtered acquisition bay, two 11 kW water/glycol and oil cooling units for the thermal regulation of the engine under test, communication systems (CAN HS / FD / Flexray) between the control panel and the engine under test via an optical converter are proposed and complete the system.
The PULSAR control and acquisition software, the PULSAR Vibe vibration supervision software and the Emitech EMC test drive system allow the laboratory to provide complete supervision of key engine parameters in correlation with the applied or measured EMC test parameters.
Julien Floch adds: "One of our challenges was to build a fully adaptive test area around the customer's motor to be tested, regardless of its dimensions, in order to respect the normative constraints. Our method allows us to radially test the different sides of a customer's product without having to use a turntable. The fact that we can carry out tests on a rotating motor, under load and on all its sides, makes it more representative of the real case."
An opening for the automotive market, but also for the aeronautics market
The high performance of the engine test bed and the environment of the test zone offer new perspectives for test campaigns as described in the specifications of car manufacturers or equipment suppliers. These requirements are similar to those of the aeronautical industry. This is why the EMCEM installation is also an asset for the future green aircraft which should take off in 2035.
More broadly, this new test bench is intended for all companies subject to these new EMC characterisation requirements for their electric motors. 
This ambitious project is supported by the French government through its "France Relance programme" and required an investment of €1.3 million as well as 9 months of study and installation time. It has mobilised the synergies of the personnel and resources in all areas of the Emitech Group.
Contact : Julien Floch – j.floch@emitech-group.com – 33 1 30 57 86 18
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