Drive Train Electric Mobility



Integrated drive system for EV

Direct Current Ltd, InnoSys Delft BV, and university TU Delft, invest, on their own title, in developing a new integrated drive system (drive train), sponsored by the Ministry of EL & I as a part of the HTAS Program by the Government.

The interpretation of the integrated system (drive train) is as follows:

  • Development of a new asynchronous machine (electric motor).
  • Development of a technically new inverter.
  • Development of a new DC / DC converter.
  • Development of a new system loader.
  • Development of a battery management system, user interface and central computer.

The development should lead to a greatly improved drive train in which all parts are aligned. These improvements should lead to:

  • Low pricing of components.
  • Reduction of components.
  • High performance of the components.
  • Significantly improved reproducibility and availability of components.
  • Greatly improved ease of loading and better control of the system.
  • A modular system with easy to replace defective parts.

As long as the above-mentioned objectives are not met, and the current situation maintains, this will form an obstruction to a broad market introduction of electric vehicle technology.

The battery charger

Version 2 which is currently being developed, also has the ability to be connected to 700Vdc nets.

Version 1: This one is suitable for both 1 and 3 phase to load with a power of 9 kW with an efficiency of 95% with a BMS connection based on CAN or RS232.

The charger has a inrush current of less than 8A.

Also the battery is galvanically separated from the network.

At the entrance is a 1 and 3 phase power factor controller with a power factor of 1.

Reason for an in-car charger

We are convinced that an in-car charger is important for the following reasons:

  • The battery is independent of the external charger and can be freely developed independently.
  • Our motto is, charge whenever you can and refuel if necessary.
  • Charging of the car must always be possible at any time and at any place.
  • The current limited capacity of EV chargers makes charging stations necessary but they are expensive.


Motor drive

Version 0.1: This one is suitable to work on the 150Vdc system a power of 55kW water cooled. This drive is still under research.

12V supply in the car

Version 0.1: This one converts the 150Vdc to a 13.4 Vdc voltage in order to charge the 12Vdc battery for the board system; this module can deliver 100A.





In order to make an electric car, there are many different components needed that are not yet integrated to each other. Within this project our chosen objective is to make integration possible and also to make it possible to link the EV to DC networks.


This project has been made possible within the HTAS program in cooperation with: