In October, Rho Motion—a company specializing in vehicle markets and economics, and providing forecasts and analyses for the energy transition—organized a seminar series seminar series focused on EV batteries and motors.  

ePropelled’s David Hudson was one of the speakers in the EV motors session on 19th October. His presentation focused on the energy equation in EVs. As he put it, “The relationship between how much energy you put in and how much you get out is a function of a propulsion system.” 

The guiding question for his session was: “Is it possible to make a significant reduction in the energy used by the propulsion system?” This achievement would not only be more cost efficient for the manufacturers and the end users, it would also help with the fight against climate change.  

To illustrate his point David used the example of the total BEV fleet for the U.K., which is 300,000 cars. He also took some known numbers about the EV energy usage, annual distance driven, and used the electricityMap app to calculate the carbon intensity of the grid. The numbers were as follows: 

  • An average energy efficiency of 300 Wh/mile. 
  • An average annual distance driven of 7,000 miles. 
  • Carbon intensity of the grid set at 250 gCO2eq/kWh. 

The total energy consumed by the fleet per year adds up to 630,000 MWh and the total CO2 (in-use only) is 157,500 tonnes. Taking this into consideration, we can assume that with EV efficiency improvements of only 15%, we can save 23,625 tonnes of CO2 per year in the U.K alone. 

And the only piece of technology that can achieve this at the moment is our eDTS. ePropelled uses its patented technology to move the islands of peak motor efficiency into places where they can be used more effectively, making the motors at least 15% more efficient. 

The point of David’s presentation was that we need to use available energy in a resourceful way and eDTS makes that possible. 

  • The system can choose the ideal torque map for prevailing torque/speed demand. 
  • It draws lower current at high torque, which extends charge and life of battery. 
  • There is no need for deep field weakening at any speed. 

eDTS doesn’t change peak efficiency. Instead, it changes the cycle average efficiency, which is what ensures energy savings.  

To learn more, or to watch the full webinar, click here.  

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