1. Wireless transmission of electric energy
PACIFIC’2011 International conference
Pantograph Catenary Interaction Framework for Intelligent Control
Antoine Caillierez, PhD student, Supelec (France)
Advisor: Daniel Sadarnac, Supelec (France)
Co advisor: Alain Jaafari, Supelec (France)

2. Introduction: The need:
An efficient method for transferring large power level over moderates distances to moving loads.
The principle:
Mutually coupled coils.
HF converter

3. Some projects over the world
Bombardier, Volvo, Van Hool

4. Some projects over the world
Serpentine until 2004 (Lausanne, CH)
small public automated vehicle.
Inductive power supply
OLEV Project (KAIST, Seoul, South Korea)
Efficiency: 74% with 13cm airgap.
OAK Ridge National Laboratory (Utah, USA)

5. Experimental model Serie parallel resonant converter
Design for 100W with at 4 cm air gap.
42V; 75kHz switching frequency
Rectangular coils (primary and secondary) : 10x20cm

6. Magnetic transformer Secondary voltage: Rectangular coils parameter
Limitation
Number of windings
Joules effect losses
Geometry of coils
efficiency
Working frequency
Skin effect and semiconductors losses

7. Mutual Inductance Coupling Factor: Neumann formula:b1 b2 A B h
Rayon r1
Rayon r2
NB spires
NA spires
Neumann formula:
Mutual inductance between two windings:

8. Results: Mutual Inductance
Air gap Z=1cm
Air gap Z=7cm

9. Results: Secondary power

10. Conclusion Efficiency. (>90%)
new lines of research for EV and transportation.
Potential for Wireless transfer of high power.

11. Questions?