Laboratory Performance and Safety Test Results of the Hyundai/Mojo Mobility 7.0 kW WPT System

Richard “Barney” Carlson, Rakan Chabaan, Shawn Salisbury, Bilal Javaid

October 2017 - In recent years, as electric vehicles have become more popular and manifest in the market, charging systems have become an important aspect of electric vehicle utilization and adoption. Currently, it takes at least 4 hours to fully charge the Kia Soul EV using level 2 (6.6kW) charging. Wireless charging makes the charging process automated, which enables a vision where chargers are commonplace and the driver does not have to be concerned with plugging in for routine driving. For example, wireless chargers may be in public parking lots or even embedded in the roadway, so the driver does not have to stop for hours merely to recharge the vehicle. In this view, wireless charging is a key enabling technology for the widespread adoption of electric vehicles. In this manuscript, an overview of the prototype wireless power transfer (WPT) system design is provided as well as detailed laboratory test methodology and test results of the aforementioned WPT system. The WPT system design, development, fabrication, and calibration were executed by the Hyundai Motor Company in partnership with Mojo Mobility Inc. under the U.S. DOE FOA-667. Testing of the WPT system as integrated into a Kia Soul EV was conducted at Idaho National Laboratory’s (INL) Electric Vehicle Infrastructure (EVI) lab to quantify the performance and safety capabilities of the WPT system. Testing was conducted across a wide range of coil misalignment, coil gap, and power transfer levels. This manuscript details the test results and findings from the Hyundai / Mojo mobility WPT system which includes measured values of overall system efficiency (AC to DC), sub-system efficiencies, power quality metrics, and electromagnetic field (EM-field) emissions measurements around the vehicle.

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