eDTS is an innovative electric propulsion technology for a range of electric vehicles (EVs). 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’s take on efficiency is very broad and focused on getting more output from the same input, unlike other technologies. More specifically, we use energy more intelligently and economically to deliver superior performance. Most motors’ highest power efficiency is only available in a very narrow band (a small island we refer to as a “sweet spot”) on the power map. eDTS allows vehicles to operate at maximum efficiency at a much wider efficiency band (a very large island) on the power map.
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% (based on New European Driving Cycle—NEDC—simulations).
Internal combustion engine (ICE) vehicles are typically limited to an operating range of 1,000 to 6,000 RPM and require complicated, expensive, and heavy multi-ratio gearboxes to produce usable power over the operation range that extends from a standstill all the way to its maximum speed. However, the result is a smooth torque curve across the full operating range.
Conventional EV motors can produce a similar curve, but at the cost of efficiency. As is seen in the diagram, the peak efficiency occurs in a relatively small area—the “sweet spot” (an island) for the motor—and it tails off markedly at higher speeds.
eDTS overcomes these limitations and delivers a smooth power curve with high efficiency throughout. The different modes that eDTS creates can provide multiple “sweet spots” that correspond to the operational needs of the vehicle, such as high torque for starting from a standstill to high efficiency at highway speeds.
eDTS reconfigures the motor modes using hardware and software. As a result, each mode will have different characteristics including torque profile, speed range, and constant power range. This allows for very efficient delivery of optimized performance across the power curve by minimizing the losses in the magnetic material and copper windings.
eDTS allows our single motor to function as if it were multiple different motors, each ideally suited to a desired “sweet spot” on the curve and each area of high-efficiency being additionally expanded. This way, each mode is optimized to deliver different performance characteristics, such as high torque when starting from a stop and a seamless change to high efficiency at higher speeds. Since these needs change quickly and frequently when driving, our sophisticated software control is an essential aspect of the system.
The magnetic field pattern and other parameters of the electric machine change, giving it the flexibility to operate optimally when controlled by the adaptive power electronics drive. The control system is designed to allow the transition between the modes to take place seamlessly to deliver optimum torque/speed/ efficiency characteristics in real time.
eDTS is based on our patent for reconfigurable windings and the system comprises three main components:
The system is highly scalable to meet the needs of a broad range of EVs:
Our unique cooling features enable UAVs to fly higher in thinner air where cooling is a challenge.
Our systems provide best-in-class power and thrust per weight ratio to meet mission parameters.
Our systems are smarter, using standards-based CAN gives you access to all sensor data.
Starter Generators use the mechanical energy from the internal combustion engine (ICE). ePropelled has a family of starter generators ranging from 500 Watts to 12 kW. While our SGs provide the same power generation as an alternator, they have enough torque to start the engine. When paired with our power electronics, the SGs can also support hybrid applications.
ePropelled’s Intelligent Power Systems take the AC generated by the SG and convert it to DC to power the onboard systems. The iPS also gathers sensor data and provides access via an industry-standard CAN bus.
The Electronic Engine Starters use an onboard battery to send power to the starter generator to start the engine. This allows the UAV to be completely self-contained. The EES also allows the SG to function as a battery-powered motor for hybrid applications including power assist for take-off and extended range for emergency landings.