125/250kW Central E-axle for electric rubbish truck /sprinkler truck

Advantage 1: High efficiency and energy saving

Helical gears replace helical bevel gears, and the mechanical efficiency can reach 98%;

Using high-efficiency oil-cooled motor and active lubrication system, the system efficiency can reach up to 93%;

The weight is significantly reduced, and the weight is reduced by more than 400Kg compared with the central pure electric drive system (double-axle structure);

Advantage 2: Control strategy advantage Torque assist can realize power without interrupting gear shifting;

It can realize heavy-load ramp-up shifting and improve operational efficiency;

Optimize the control strategy and improve driving comfort;

Advantage 3: Excellent power performance

The total power of the system is up to 440KW;

The maximum climbing degree of the 49T tractor is more than 35%;

The maximum speed can reach 125km/h;

Pumbaa PMEA40000Z Central E-axle Matching vehicle type：18T-23T sprinkler truck/garbage transfer truck

Abstract

The automotive electric drive axle (eAxle) is the "power core unit" of electric vehicles (EVs), with its technological advancements directly influencing range, performance, and intelligence. This paper systematically analyzes the core components (motor, inverter, reducer, etc.) and future trends (integration, efficiency, high-voltage adaptation, intelligence) of eAxles, revealing their critical role in the upgrading of the EV industry.

1. Introduction

Global EV penetration exceeded 18% in 2024, with the electric drive axle (eAxle) emerging as the "power heart" whose technological breakthroughs are key to driving EVs toward "efficiency and intelligence." This paper explores the composition and trends of eAxles to elucidate their technical logic and development direction.   

（Electric Drive Axle）

2. Core Components of Electric Drive Axles

An eAxle is an integrated system of "motor + inverter + reducer," with key components and functions as follows:

2.1 Motor: The "Heart" of Power Output

Permanent magnet synchronous motors (PMSM) dominate, achieving 5000W/kg power density (e.g., Tesla Model 3) and >97% efficiency. Trends: 3D-printed rotors (reducing torque ripple to 0.3%) and V-shaped built-in magnets (enhancing air-gap magnetic flux).

2.2 Inverter: The "Brain" of Energy Conversion

Shifting from silicon-based IGBTs to wide-bandgap devices (SiC/GaN), conduction losses are cut by 50%, and switching frequency increased 10x (e.g., Porsche Taycan SiC inverter), with system efficiency exceeding 96%.

2.3 Reducer: The "Hub" of Torque Amplification

Evolving from single-speed to multi-speed (two-speed/four-speed) designs, supporting "low-speed high-torque + high-speed efficiency" (e.g., Porsche Taycan Turbo S), reducing 0-100km/h acceleration by 0.5 seconds.

2.4 Auxiliary Modules: Intelligent Sensing and Synergy

Integrated current/temperature/position sensors (±0.5%/±1℃/±0.1° accuracy) communicate with BMS (battery management) and ADS (autonomous driving) via CAN/Ethernet, enabling pre-adjusted torque output (e.g., Tesla FSD synergy).

（Overall Structure of Electric Drive Axle）

3. Development Trends of Electric Drive Axles

3.1 Integration: Reducing Size and Cost

Through "integrated die-casting + modular design" (e.g., Huawei DriveONE, XPeng G6 eAxle), volume decreases by 40% and cost by 25%, driving "multi-domain integration."

3.2 Efficiency: Dominance of Wide-Bandgap Devices

SiC/GaN will replace silicon-based IGBTs (70%+ market share by 2027), achieving 97% system efficiency and extending range by 10% (e.g., NIO ET7 eAxle).

3.3 High-Voltage Adaptation: 800V Platform Compatibility

Supporting 250kW ultra-fast charging (300km range top-up in 10 minutes) with <2% current ripple (e.g., XPeng G9 eAxle), addressing "range anxiety."

3.4 Intelligence: Deep Synergy with Autonomous Driving

Integrated NPUs optimize torque distribution via AI algorithms (e.g., predictive energy management), with response latency <10ms (e.g., BMW iX eAxle).

（Internal Structure of Electric Drive Axle）

Conclusion

The electric drive axle is the "power core unit" of EVs. Its evolution from "decentralized components" to "highly integrated systems" has driven comprehensive improvements in power efficiency, cost, and intelligence. With future advancements in integration, wide-bandgap devices, and AI, eAxles will emerge as the hub for "power + energy storage + intelligence," supporting global carbon neutrality goals.