Dynamic Torque SwitchingTM (eDTSTM) is an innovative electric propulsion technology for a range of electric vehicles. It delivers a significant improvement in power efficiency and performance, which translates into a net reduction in vehicle cost through smaller battery packs, extended range, or a combination of the two.   

ePropelled has patented the technology that allows the electric motor to provide high torque at low speeds without drawing high current from the batteries. It also provides high speeds at low torque levels without using deep field weakening and at much reduced winding losses, thereby increasing the efficiencies throughout. This technique utilizes the motor magnets and the motor windings optimally and improves the overall drive cycle efficiency, allowing the range of the vehicle to increase by at least 15%. 

The eDTS system is based on our patent for reconfigurable windings and the system comprises three main components: 

  1. The eDTS motor is a brushless permanent magnet synchronous machine. In this example it is an interior permanent magnet motor (IPM motor) where the rare earth magnets are embedded in the rotor. The stator and rotor consist of laminated cores. The distributed phase windings are divided into sections and is inserted in the stator. The cooling of the motor is achieved and maintained by using integrated water-cooling ducts in the housing. Our expertise in magnetic engineering is manifest in the choice of active materials used and how they are implemented in the magnets, windings, and laminations. This motor design provides an ideal combination of high torque, high power density, and high efficiency. 
  1. The power electronics drive is paired with the motor for best performance. It includes a high voltage inverter and a control system. Based on vehicle demand, the control system will automatically select the most efficient operation mode, which will save battery energy and increase driving range. The control system uses real-time adaptive shift maps and machine learning to control the switch matrix and the motor parameters for optimum propulsion system performance. The unit is liquid cooled and we leverage SiCFET technology to ensure optimal efficiency. 
  1. The switch matrix links the many windings of the motor to the phases of the drive. Based on the input from the control system, the switch matrix connects the sections of the windings in a series, series parallel combinations, or all in parallel. Among others, this manages the control of the induced back electromotive force (back EMF), current draw and density, and magnetic flux linkage, resulting in switching the torque, speed range, and constant power range. 

Our combination of motor design, material science, and software control produces a much more efficient method of electric propulsion at various torque and speed levels.  

Main eDTS system benefits are undeniable: 

  • At least 15% reduction in system-level energy consumption. 
  • Vehicles last longer between charges. 
  • Lower costs due to smaller batteries and increased efficiency. 

This blog post is an excerpt from our eDTS technology overview, which you can download from this page