Electrified drivetrain development is increasingly constrained by higher voltage architectures, tighter packaging envelopes, and rising efficiency expectations. At the same time, validation cycles for motors, inverters, and gearsets are becoming longer as systems grow more tightly coupled. In response, many OEMs are moving away from sourcing discrete propulsion components and toward fully integrated electric drive units, or EDUs.
Turntide Technologies’ axial-flux electric drive unit (EDU), integrating the motor, gearbox, and paired inverter into a compact propulsion system designed to reduce drivetrain integration and validation effort for electrified vehicles.
This shift reflects a practical engineering challenge. When motors, inverters, and gearboxes are developed and validated independently, interaction effects often emerge late in the program, extending test timelines and increasing risk. Integrated EDUs address this by delivering propulsion systems that are validated as a whole, with matched thermal, mechanical, and control characteristics.
To address these integration and validation challenges, Turntide Technologies is launching an axial-flux EDU platform designed to reduce development burden for hybrid and electric vehicle (EV) manufacturers while preserving scalability and configurability.
Why integration is becoming necessary
As voltage levels increase and available space decreases, coordinating propulsion components has become a limiting factor in drivetrain programs. According to Matrishvan Raval, product lead for axial-flux motors at Turntide, sourcing and validating separate components is no longer just inefficient, but structurally problematic.
“EV drivetrain development, both electric and hybrid, is becoming more challenging as higher voltages, efficiency demands, and limited space push manufacturers toward integrated electric drive units,” he explains. “Sourcing and validating separate motors, inverters, and gearing from multiple suppliers can take months to years.”
An integrated EDU consolidates these efforts. Instead of validating interfaces between independently optimized components, OEMs receive a propulsion system that has already undergone coordinated electrical, mechanical, and thermal analysis.
“An integrated EDU helps accelerate vehicle and equipment development, often reducing time to market by three to six months,” Raval adds. “The EDU simplifies selection and installation, while reducing supply chain complexity by relying on one manufacturing partner to manage planning, selection, and implementation.”
Axial-flux architecture and packaging efficiency
Axial-flux motors differ fundamentally from radial-flux designs in how magnetic flux travels through the motor, enabling higher torque density in a shorter axial length. For drivetrain engineers, this directly affects packaging, mass, and gear reduction strategy.
“Perhaps the biggest pain point solved is packaging,” says Raval. “In many cases, OEMs do not have to alter the existing vehicle or equipment design to use the compact axial-flux EDU. Its low footprint allows designers and engineers to drop this system into the vehicle drivetrain architecture without design changes.”
High torque at low speeds also enables simpler gearbox designs, reducing mechanical complexity while improving durability.
“Durability is another challenge since many vehicles and equipment face harsh operating conditions,” Raval notes. “Having this combination of the motor and the gearbox with the right analysis on the gear design extends gearbox life.”
Axial-flux EDU configuration highlighting high-voltage connections and inverter integration with the drivetrain assembly. The architecture reflects a system-level approach to packaging, thermal coordination, and power electronics integration.
Features of the axial-flux EDU platform
From an EV engineering perspective, this axial-flux EDU is designed as a fully matched propulsion system rather than a collection of optimized components.
Key features include:
- Modular axial-flux motor architecture
Axial-flux motors can be stacked to deliver scalable power output across a wide range of vehicle requirements.
“The EDU is highly scalable,” Raval explains. “Axial-flux motors can be stacked to deliver a wide power range, and the system can be configured for the specific vehicle or equipment.”
- Compact, lightweight propulsion package
The axial-flux architecture requires significantly less volume and mass than comparable radial-flux systems, improving packaging flexibility and overall vehicle efficiency. - Integrated motor and gearbox with lifecycle matching
The motor and gearbox are analyzed and validated together for a defined duty cycle, aligning drivetrain life with application demands.
“The system is also fine-tuned and lifecycle matched for the motor and the gearbox,” says Raval.
- Shared motor and inverter cooling
The EDU uses shared water-glycol cooling channels for the motor and inverter, eliminating separate thermal loops.
“Another challenge solved is multiple cooling systems,” he explains. “The Turntide axial-flux EDU has shared water-glycol cooling channels for the motor and the inverter, which simplifies the system and provides enhanced thermal efficiencies.”
- Paired but flexibly located inverter
While electrically matched and validated with the motor and gearbox, the inverter can be positioned elsewhere under the hood to accommodate packaging and thermal constraints. - Control optimization and drivetrain compensation
Inverter operation is fine-tuned to the motor’s torque-speed characteristics, with drivetrain compensation built into the control strategy.
“Control algorithm fine-tuning and optimization adds drivetrain compensation as a feature, which ensures a smooth ride for the end user,” he says.
Performance under real-world duty cycles
Beyond peak torque and power density, the axial-flux EDU has been validated under sustained vibration, load, dust, and heat during extreme off-road operation. These conditions are representative of demanding EV duty cycles where continuous performance and thermal stability are critical.
Turntide’s Sierra Echo-R, powered by the axial-flux EDU platform, competed in the King of the Hammers Desert Challenge. The event subjected the drivetrain to sustained vibration, load, dust, and heat, providing real-world validation of the EDU’s thermal and durability performance.
Turntide Technologies reports that insights from this testing are informing further refinements to simplify integration and accelerate deployment across electrified platforms.
For EV OEMs and drivetrain engineers, integrated axial-flux EDUs offer a practical path to reduced validation effort, improved packaging efficiency, and predictable system-level performance.
As electrification expands into more demanding vehicle categories, matched and validated propulsion architectures are increasingly becoming a foundation rather than an option.
One final consideration for OEMs evaluating integrated propulsion systems is long-term reliability under real operating conditions.
“Axial flux motors are inherently reliable and require low maintenance,” says Raval. “This high-reliability design has been tested in harsh and aggressive operating conditions using standard off-the-shelf gearing and transmission components.”
Turntide Technologies will unveil the axial-flux EDU at CONEXPO in Las Vegas, taking place March 3–7, 2026.
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