Wireless EV Charging

The Wireless Power Transfer (WPT) technology is based on magnetic coupling between power transmitting and receiving coils. 

The transmission coil (TX) is installed in the roadway or parking lot.

 

The receiver coil (RX) is mounted on the EV assembly side.

 

Once aligned, the TX and RX coils can transfer up to a maximum charging level with a coupling efficiency of up to 92%.

 

From the receiver coil, power electronics convert the power so that it is compatible with the battery. The power is stored in the battery as energy.

OVERVIEW

DISADVANTAGES WITH WIRED EV CHARGING

  • EV drivers must remember to charge the EV but may forget - resulting in lost productivity and time.

  • The charge range anxiety is high due to low miles per battery charge.

  • Battery swapping wastes money and may cause safety issues for the maintenance team.

  • Charging cables are bulky, inconvenient, may cause electric shock, and are susceptible to wear.

  • EV fleet managers must keep track of EV charge status. Charging a large fleet of EVs is difficult to keep track of.

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BENEFITS OF WIRELESS EV CHARGING

  • Stat-EI’s charging solution contains fewer parts – and has higher reliability than other proposed solutions. This is critical for transportation applications

  • Can be implemented in any type of EV (scooter through the car to mining vehicle)

  • Both static (stationary) and dynamic (in motion) charging solutions are possible with proper infrastructure. Roadway solutions can charge at highway speeds

  • Reduces the size, weight, and cost of the battery, the most expensive part of an EV

  • Charging becomes extremely convenient for the user. When dynamic infrastructure becomes common, skip charging stations/stops altogether!

  • Dynamic charging makes it possible to use smaller, lighter batteries (in new EV designs) – decreasing vehicle weight/cost, increasing effective range, AND EV safety Adjustment is made automatically to account for battery health

  • Fleet operators can adjust charging Time(s) of Day to manage charging costs or to adjust to fleet deployment parameters

  • Because WPT is bidirectionally capable, V2G operation is possible to shore up the grid during emergencies (the charging interface is bidirectional)

  • Both static and dynamic solutions have been implemented in golf carts and automobiles – and are being installed in other vehicles as we speak!