Electric Vehicles

Can EVs Lose the Plug & Go Wireless?

March 2013, Green Fleet Magazine - Feature

by Lauren Fletcher - Also by this author

The Delphi wireless charging system involves no plugs or charging cords. Electric power flows upward from a power source resonator to a power capture resonator installed on a vehicle.
The Delphi wireless charging system involves no plugs or charging cords. Electric power flows upward from a power source resonator to a power capture resonator installed on a vehicle.

Fleets may be just getting used to the concept of plugging in their vehicles to “fuel up,” but there may be a new game changer: the ability to charge electric vehicles (EVs) wirelessly.

The concept isn’t new. In fact, it’s almost as old as the battery itself. According to Battery University, in 1831 English scientist and inventor of the electric motor,Michael Faraday discovered induction and stated that electromagnetic forces can travel through space.

In the late 1800s and early 1900s, Serbian electrical engineer Nikola Tesla began demonstrating wireless broadcasting and power transmission. Early experiments in Colorado Springs in 1899 led to the Wardenclyffe Tower in New York. One of the modern devices to use this technology is the electric toothbrush. More recently, the technology has moved to charge mobile phones.

So, it was almost 200 years ago that the concept of inductive power transfer was first proposed. According to Qualcomm, the technique was simple: a wire carrying an electric current produces a magnetic field around the wire (Ampere’s Law); a coil intersecting a magnetic field produces voltage in that coil (Faraday’s Law); so two loosely coupled coils can transfer power by passing a current through one of them and taking power from the voltage produced in the other.

When used for wireless EV charging, the system uses magnetic fields. For most systems currently being tested, energy is transferred from the transmitter in the parking pad and converted into an electrical current by the vehicle adapter.

Several companies are currently developing wireless EV charging technology, including Plugless Power (manufactured by Evatran), Delphi, and Qualcomm.

Why Go Wireless?
Wireless EV charging helps ensure vehicles are charged, without leaning on drivers to remember to plug the vehicle in. The system can start charging a vehicle once it drives over a special pad mounted on the ground. An additional benefit could be found through the use of this technology, coupled with a smart charging system, which charges vehicles during off-peak hours to help reduce electrical costs.  Delphi’s wireless charging system can also help increase the fuel economy of plug-in hybrids by increasing the frequency of having a fully charged battery, according to the company.

One other benefit of utilizing a wireless charging system is deterring vandalism or the theft of charging equipment (e.g., cables due to the high value of copper) since the components are mounted directly to a device or stationary object.

Also, according to research shared by Qualcomm, conductive or cabled systems are not always ideal for EV charging. Rain, ice, snow, or extreme heat and cold present challenges with plugs and cables. Vehicles charged inductively only need to be parked over an inductive pad for charging to occur.

“At the core of clean urban mobility is a need to recharge EV batteries simply and conveniently, without the need for plug-in cables and associated street furniture,” said Anthony Thomson, PhD, VP, business development and marketing for Qualcomm. “Simplicity and minimum driver intervention are key features that win out time and time again in novel technology adoption and when these features are coupled with high power transfer efficiency, wireless charging offers an elegant and effortless solution.”

According to Delphi, its wireless charging system is engineered to provide a safe, robust, reliable, and quick charge. The Delphi system is hands-free, using a system to transfer energy via an oscillating magnetic field, which is safe for humans and animals. The magnetic field emitted will meet or exceed industry safety guidelines.

While each company’s system and components differ slightly, they typically include:
● An adapter or receiver that will be
attached to the vehicle.
● A pad mounted to the ground.
● A power station.

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