Print  |  Send  |   

Inductive charging takes shape at BMW and Daimler

July 08, 2014 // Christoph Hammerschmidt

Inductive charging takes shape at BMW and Daimler

BMW has granted an insight to its development of inductive charging schemes for electric vehicles. In the medium term, the company plans to launch series production for the technology. The project is conducted along with competitor Daimler; both companies plan to provide a uniform charging technology for the garage at home.

Page 1 of 2

The system consists of two components: A primary coil integrated into a base plate which itself is placed beneath the vehicle, for instance in the floor of a garage or parking lot. This coil induces electric energy to the secondary coil in the car floor.

The arrangement of the coils, and consequently of the field pattern, is based on a design derived from their circular shape that offers a number of benefits such as a compact yet light construction as well as an effective spatial confinement of the magnetic field - a feature important to maintain high efficiency. The alternating magnetic field between the coils transmits the electric energy wirelessly at a power of up to 3.6 kW. BMW specifies the energy efficiency of this arrangement at 90%. The system aims at charging high-voltage batteries for plug-in hybrid and battery electric cars.

One of the design goals was achieving the shortest possible charging time. At a charging power of 3.6 kW, many plug-in hybrids can be charged completely in less than three hours. The BMW i8, the company's current technology flagship, can be charged in less than two hours. The i8 has, unlike its smaller sibling i3, a plug-in hybrid powertrain while the i3 is a battery electric car. To take higher battery capacities for purely electric vehicles into account, the future wireless charging technology standard offers the option to increase the charging power to 7kW which would make it possible to charge the batteries of the i3 over night.

1 | 2 | Next page

All news

Power Train

Follow us

Fast, Accurate & Relevant for Design Engineers only!

Technical papers     

Linear video channel


Read more


To ensure you have a good start in 2015, Freescale is giving away five of its QorIQ TWR-LS1021A Tower system modules, worth USD269 each, for EETimes Europe's readers to win.

The module is the most feature-rich and high-performance Tower system offered by Freescale, enabling compatibility and interoperability with the growing list of Tower expansion modules, offering an easily accessible...


Design centers     

Infotainment Making HDTV in the car reliable and secure

December 15, 2011 | Texas instruments | 222901974

Unique Ser/Des technology supports encrypted video and audio content with full duplex bi-directional control channel over a single wire interface.


You must be logged in to view this page

Login here :