Oswell Co., Ltd.

High-Performance, High-Power

Three-in-One Powertrain

Product Overview

In the field of new energy vehicles, the electric drive system is one of the core components, and its performance directly influences the vehicle’s driving experience and energy efficiency. Today, let us take a closer look at the high-performance, high-power three-in-one powertrain newly developed by Oswell Co., Ltd. This product boasts outstanding performance and advanced technology, whilst also demonstrating forward-thinking and innovation in terms of software and services.

Whilst maintaining high quality, Oswell Co., Ltd. has effectively controlled costs through optimisations in supply chain management and production process improvements, thereby providing electric drive system solutions for new energy vehicles that offer even better value for money.

01 High System Efficiency

Overall system efficiency ≥89.0% @CLTC 400V

Overall system efficiency ≥89.0% @CLTC 400V

02 Modular Development

Integrated housing design for the gearbox and motor

Motor controller compatible with Si/SiC

03 Platform-Based Development

Requirements for different performance parameters can be met by replacing specific components; the rotor and the gearbox input shaft are effectively coaxial.

Power range: 150 kW–300 kW

Input torque range: 350 N·m–450 N·m

Three gearbox variants have been derived from the same platform to meet the installation requirements of different vehicle models.

04 Integration of Discrete IGBTs in the Controller

Within the electronic control module, the IGBT module is the most critical component of the inverter. We have constructed a parallel-series structure comprising several IGBT chip units inside the module. When direct current passes through the module, the rapid switching of different combinations of IGBTs alters the direction and frequency of the current flow, thereby generating the desired alternating current.

Discrete IGBTs feature lower voltage and current ratings, whilst offering strong power-handling capabilities, excellent heat dissipation performance and high compatibility with other components.

05 Low Shaft Current Design

By optimising electromagnetic design, improving grounding methods and utilising insulating materials, we reduce or eliminate the generation of shaft current. This enhances the efficiency and stability of the entire system, extends bearing life and reduces maintenance costs.

06 Industry-Leading NVH Performance

Precise regulation of voltage, current and power distribution is achieved through harmonic injection; precise control of output voltage or current is realised by adjusting the duty cycle and frequency of the PWM signal; and by optimising gear parameters such as tooth profile, tooth width and number of teeth, greater overlap and a more uniform load distribution are achieved, thereby reducing noise and vibration and enhancing overall system performance.

07 Battery Heating

The motor generates a certain amount of heat during operation; this heat is typically regarded as waste heat and dissipated into the environment. Through a dedicated heat transfer and control system, the motor’s waste heat is effectively collected and directed to the battery, significantly reducing the battery’s preheating time and improving its charging and discharging efficiency. This enhances the vehicle’s driving performance whilst effectively mitigating NVH issues during the heating process.

08 Overmodulation (OM)

Overmodulation enables the inverter to improve voltage utilisation within a defined PWM modulation scheme or by changing the PWM modulation technique (e.g. from SPWM to SVPWM/DPWM). This allows for increased motor output torque and efficiency under the same current conditions. By increasing the root mean square (RMS) value of the AC-side output voltage without raising the DC-side voltage, the aim is to increase output power.

09 High Safety Rating

Product development is based on the V-model and complies with the ASIL C functional safety requirements of ISO 26262 (ASIL D support available).

10 Dual-Backup Rollback OTA Solution

This enhances system reliability and stability whilst reducing the risk of upgrade failure. It simplifies the upgrade process, minimises user intervention and improves the user experience. It is suitable for applications with extremely high requirements for system stability and reliability.

Zhejiang Oswell Electric Technology Co., Ltd. is a national-level high-tech enterprise, a ‘Specialised, Refined, Distinctive and Innovative’ enterprise, and a pre-unicorn company that integrates R&D, manufacturing, sales and service. As the Zhejiang Provincial Research Institute for New Energy Vehicle Drive Systems, Oswell focuses on pioneering, innovating and deepening its expertise in the fields of new energy vehicle powertrain systems, electric motors and their control systems, intelligent connected electrical systems, and smart mobility services. It has been recognised as one of China’s Top 100 Powertrain Enterprises and an Outstanding Supplier to Geely Automobile. The company’s new NEV electric drive system headquarters project, currently under construction in the Zhuji Economic Development Zone, Zhejiang Province, represents a total investment of 5.5 billion yuan and covers a site area of 352.7 mu. It has been successfully selected as a major industrial project in Zhejiang Province.