Momentum Dynamics To Deliver 200 kW Wireless Charging For Electric Buses This Year

APR 19 2016 BY MARK KANE 16

Momentum Dynamics

Momentum Dynamics

Momentum Dynamics announced its short-term readiness to deliver the company’s first 200 kW wireless charging system, for electric bus use later this year.

Previously, Momentum Dynamics has already developed and delivered both 25 kW and 50 kW systems to “strategic partners in the automotive industry” and believes that 25 kW will shortly be the new standard in the industry(Although we might suggest that, at least in regards to personal transportation, wireless charging has yet to establish itself at all in a meaningful way)

The higher power 200 kW stations will be used for larger vehicles, such as buses for automatic “on-route” charging.

The first two systems are to be delivered to municipal agencies this year in Maryland and Washington state.

Momentum Dynamics encourages that efficiency is on par with plug-in charging and works under all weather conditions.

“Wireless chargers use resonant magnetic induction to transfer power without the use of cables. They include the transmitter on the ground and a power receiver mounted to the underside of the vehicle. Despite an air gap of up to 12”, the efficiency of inductive charging is equivalent to plug-in charging.”

Momentum Dynamics CEO Andrew Daga said:

“These high power levels are causing a lot of excitement across targeted vertical markets, especially with municipal bus transit agencies where high power is required to keep a municipal bus in operation all day,”

“Fast automatic charging will enable the EV market to grow faster. It is completely autonomous, carefree and safe,”

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16 Comments on "Momentum Dynamics To Deliver 200 kW Wireless Charging For Electric Buses This Year"

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“…Despite an air gap of up to 12”, the efficiency of inductive charging is equivalent to plug-in charging.”

At a 200kw transfer rate, that seems difficult to believe, since the ‘plug-in’ efficiency is > 99%. The ‘loss’ through the connection, that is.

Equivalent could be just closer than something else in energy transfer, like heat, liquid, or worse ICE.
So over 80% efficiency is closer equivalent to 99% than 45% or 25%.
It is PR and nothing much else.

My understanding is that efficiency goes up as the power goes up.

Who cares really if it is 5% more or less efficient, you pay much more for convenience, brand, comfort, car size that you only need as status symbol, etc. It certainly can be designed to be more efficient than some 80%. Electricity cost isn’t greatest part of TCO of electric car, manufacturing is.

Here is a bit more detailed article:

Extra convenience of wireless charging is obvious. Imagine you can exit your car under some roof in rain or snow and command it to drive to nearby charging spot, and command to return back charged up when you return. Folks in snow trying to find proper adapter X for charger N will look pathetic nearby.

The link provided by zzzzzzzzzzzz mention 90% efficiency, and say it’s on par with direct plugging.

10% of 200 kW is 20 kW, and that is what you need to heat your home in -30c° winter.

I don’t call that high efficiency at all.

Look, 90% efficient is 90% efficient. It doesn’t matter if the 10% are 1 watt or 1 GW. The higher rate is exactly compensated by shorter time, as long as efficiency is the same.

If you use on average 20 kWh per day, 90% efficiency means wasting 2 kWh per day

Obviously the more efficient the better. But for me, I think 90% is getting very close to acceptable. 95% certainly would be. Even though that adds up to a big number with many cars, it’s still just 5% loss. And even cables are lossy.


Yep…Very interesting 🙂 Progress !!!!

WHy the weakest system should become the standard!?! To recharge newer more powerful vehicle slower??? Or to become obsolete fast and pay again???

Wireless systems are great for older drivers and the arthritic, but they shouldn’t make almost unbelievable claims without some documented proof.

If you have trouble plugging in a car how will you react fast enough to avoid the person who stepped out in front of you in the parking lot. If someone has trouble plugging in, maybe they should think about turning in their license.
That being said, i know Andy Daga. His company is local to my area. He has presented to our local electric car club, the EEVC. If they are claiming efficiency comparable to plugging in, i would believe it. I forget the exact numbers, but have discussed wireless charging efficiency with Andy plenty of times on our google group. Ill send him a link to this article and he may be along shortly to address your questions. They are not a fly by night startup. And while other companies are selling 3kw systems, they are focusing on what we need 25kw and higher systems.

Automatic Emergency Braking. Duh.

This could also help in charging passenger cars at higher current and voltage without the associated risks, when handling cables & plugs.

“Momentum Dynamics approximately 90-percent efficiency is on par with 90-percent-efficient plugged level 2, and 86-87-percent plugged level 3. Losses for all types are at the power electronics. Despite reports saying wireless wastes energy, essentially, this wireless’ efficiency is within range of wired.”

Of course not!
Wired connection is around 98 to 99% efficiency, if you include losses in cable and connector.
BTW, losses in wire and connector are also occurring in wireless because they’re also wired and connected, so it’s pretty dumb to say it’s on par.

Well I don’t know if I would keep pouring gas into a car if 10% of it was being spilled on the ground.

On the other end I like the bigger power. If you have one in the front, one in the middle and one in the back of your car you could charge at a 600 KW power. That means a by then standard battery pack of 150 KWh could be charged in 15 minutes or less with some remaining energy in the pack.

I still think a contact based pantograph system under the car with secured contacts on a small bump would be simpler and cheaper as well as 100% efficient.