540V 60kW 9-Phase E-Steering Drive Axle Assembly | Ideal for Fuel-to-Electric Retrofit & New Vehicle Development

In the electrification upgrading projects of 4–6 ton medium-duty trucks, large & medium sightseeing buses and city electric coaches, many OEMs and retrofit enterprises are confronted with tough challenges in 4WD layout and front steering powertrain selection: When permanent magnet synchronous motors are adopted as steering drive axles, passive rotation of front wheels during vehicle coasting tends to generate back EMF and bring extra energy consumption. Split controllers feature numerous discrete components and complicated wiring, resulting in limited chassis layout space. Conventional drive axles lack steering capability, making integrated front steering-drive layout difficult to realize, which greatly increases chassis reconstruction difficulty for fuel-to-electric conversion.

Fengchuan Powertrain proudly launches FC1D260-540Z 540V 60kW Electric Steering Drive Axle Assembly, integrating Steering Drive Axle + 9-Phase AC Induction Motor + Multi-in-one Integrated Controller + VCU Vehicle Control Unit. Natively supporting front steering layout, it is especially suitable for vehicle front-rear 4WD architecture. Equipped with AC induction motor, it inherently avoids energy loss caused by back EMF during coasting. Matched with highly integrated multi-in-one electronic control unit, it features simplified wiring and convenient assembly. Widely applicable to 4.0T~6.0T cargo trucks, electric buses and large sightseeing vehicles, it perfectly supports both forward development of brand-new vehicles and fuel-to-electric retrofit projects. All components are developed to automotive standards with full-unit IP67 ingress protection. One-stop supporting cooling systems, high/low voltage wiring harnesses and VCUs are available to drastically reduce vehicle development and retrofitting difficulties.

1. Integrated Front Steering Drive Axle, Optimal Solution for 4WD Architecture

FC1D260-540Z adopts an integrated scheme of Steering Drive Axle + Induction Motor, integrating steering and driving functions into one unit, delivering prominent advantages over traditional split layouts:

1. 9-Phase AC Induction Motor, Core Advantage for 4WD Vehicles For vehicles adopting front-rear 4WD configuration with rear axle as main drive and this unit as front steering drive axle: under coasting and downhill conditions when front wheels are dragged to rotate passively, the 9-phase AC induction motor will not generate back EMF. It eliminates dragging loss existing in permanent magnet motors, effectively cutting coasting resistance and energy consumption to improve vehicle driving range, which perfectly fits frequent coasting operation scenarios of coaches and medium-duty trucks.

   

2. Integrated Steering Drive Axle Structure to Save Chassis Space Integrated die-cast steering drive axle incorporates reducer, steering knuckle and brake mounting positions, with maximum steering angle of 30°. Standard 16-inch disc air brake is equipped, and the rear axle rated load reaches 3.5T to meet load requirements of 4–6 ton vehicles. Independent motor, transmission shaft and separate steering mechanism are no longer required, greatly simplifying chassis layout without extensive frame modification for fuel-to-electric conversion projects.

   

3. Highly Integrated Multi-in-one Controller for Minimal Wiring The electronic control unit integrates four core functions: MCU motor control, PDU high-voltage power distribution, DCDC low-voltage conversion and DCAC auxiliary inverter. One single controller replaces multiple independent electronic control parts. The quantity of wiring connectors is largely reduced to simplify assembly process and lower risk of circuit faults, facilitating assembly and after-sales maintenance.

   

The assembly can be matched with dedicated VCU, water cooling radiator and complete high/low voltage wiring harnesses. No large-scale secondary development of electronic control architecture is required; the unit can be directly mounted on vehicles after calibration matching.

2. 540V High-Voltage Platform Induction Motor with Stable & Abundant Power under Heavy-Duty Conditions

Equipped with 540V high-voltage AC induction motor, the assembly delivers sufficient power reserve to satisfy demands of medium trucks and buses under full-load climbing and sustained high-speed driving.

Induction Motor

• Rated Power: 60kW｜Peak Power: 115kW

• Rated Torque: 103N·m｜Peak Torque: 263N·m

• Max Speed: 10000rpm｜Phase Number: 9 phases

Steering Drive Axle

• Axle Gear Ratio: 15.71

• Max Output Torque: 6830N·m

• Axle Type: Die-cast Axle｜Rated Load: 3.5T

• Steering Angle: 30°｜Kingpin Inclination: 6°

• Brake: 16-inch Disc Air Brake

Multi-in-one Controller

• Rated Voltage: 400–750VDC (Compatible with 540V Platform)

• Rated / Peak Current: 60A/130A

• Cooling Method: Liquid Cooling

• Protection Class: IP67

• Integrated Functions: MCU + PDU + DCDC + DCAC

Key Advantages

• Rugged & Reliable Induction Motor for Severe Working Conditions AC induction motor features stable structure, outstanding vibration and high temperature resistance without risk of demagnetization. It can operate stably for long periods under heavy-load bumpy conditions such as construction sites, mountainous areas and scenic spots with lower maintenance requirements.
• Wide Power Band with Strong Climbing Capacity under Full Load The peak torque of 263N·m is amplified by the axle with large gear ratio of 15.71, realizing maximum wheel output torque up to 6830N·m, meeting demands of 4–6 ton vehicles for full-load startup and long-slope continuous climbing.
• Full-range Liquid Cooling, No Power Derating under Sustained Heavy Load Both motor and multi-in-one controller adopt liquid cooling to control temperature rise during long-hour heavy-duty operation. High-temperature power reduction during continuous climbing and long-distance driving can be avoided, making it suitable for high-frequency passenger and freight transport scenarios.

3. IP67 Automotive-Grade Full Protection for Stable Operation in Complex Outdoor Environments

Both motor and multi-in-one controller are developed in accordance with passenger & commercial vehicle automotive standards, achieving IP67 protection class:

• Fully sealed aluminum alloy housing delivers comprehensive waterproof, dustproof and splash-proof performance, preventing moisture and dust from invading electronic control and motor during rainy travel, muddy construction site operation and open-air scenic area service.

• Multiple safety protections including overcurrent, overvoltage, overtemperature, short circuit and insulation monitoring are built into high-voltage circuits to eliminate risks of electric leakage and high-voltage breakdown, complying with safety regulations for large & medium commercial vehicles.

• Independently sealed liquid cooling circuit supports long-hour continuous operation, meeting all-day service requirements of buses and freight vehicles.

4. Matching Professional VCU with Complete Intelligent Driving Functions

Fengchuan Powertrain can supply customized VCU perfectly matched with this steering electric drive system to realize full-dimensional vehicle control logic, ready for both new vehicle and fuel-to-electric retrofit projects:

• Precision Graded Torque Management: Linear and smooth power output without shock during startup and gear shifting, effectively protecting drive axle and transmission components to extend service life.
• Intelligent Hill-start Assist: Completely eliminate vehicle rollback risk for safer startup with heavy cargo or full passengers on slopes.
• Downhill Slow Energy Management: Realize optimized coasting strategy coordinated with whole vehicle control. No dragging loss occurs on induction motor to reduce energy consumption during long downhill travel.
• Standardized High/Low Voltage Power On & Off Safety Control: High-voltage self-inspection upon power-on and protection discharge upon fault power-off to avoid accidental energization and electric leakage risks.
• Real-time Dashboard Communication Visualization: Vehicle speed, motor status, system temperature and fault codes are synchronized to on-board instrument panel in real time for rapid fault localization and troubleshooting.

5. Full-scene Vehicle Compatibility for Both New Vehicle Forward Development & Fuel-to-Electric Retrofit

Leveraging front steering drive structure, compatibility of induction motor with 4WD systems and 540V high-voltage high-power platform, the product fits various medium-duty new energy vehicles and fuel retrofit models:

• 4.0T–6.0T Medium-duty Cargo Trucks (New / Retrofit): Electrification upgrade for urban-rural short-distance freight, building material transportation and sanitation vehicles; front steering layout brings flexible chassis arrangement.
• City Electric Buses & Medium Passenger Coaches: Short-distance commuter buses and factory shuttle buses; front steering layout saves rear cabin space.
• Large & Medium Scenic Sightseeing Vehicles & On-site Shuttle Buses: Passenger transport within enclosed parks, featuring low noise and high reliability to adapt to complex curve and slope road conditions.
• 4WD Special Operation Vehicles: Optional front steering drive axle scheme for front-rear dual-drive vehicles to resolve coasting energy consumption of permanent magnet motors.

6. One-stop Implementation Supporting Services from Fengchuan Powertrain

For the complete FC1D260-540Z steering drive axle solution, Fengchuan Powertrain provides full-process technical support to help vehicle manufacturers and retrofit factories achieve mass production rapidly:

1. Bundle Delivery of Complete Hardware: Optional matched steering drive axle + induction motor + multi-in-one controller + VCU; water cooling radiator and complete high/low voltage wiring harnesses are also supplied to realize one-stop procurement of all powertrain and electronic control components.

2. Customized Software Calibration: Torque output, coasting control and protection thresholds can be tuned according to vehicle gross weight, operating road conditions and whether 4WD architecture is adopted.

3. One-on-one Full-cycle Technical Support: Automotive-grade warranty system; professional engineers provide follow-up service including installation guidance, vehicle calibration, fault troubleshooting and staff technical training. Special chassis matching schemes are provided for fuel-to-electric conversion projects.

4. Custom Optimization for Bulk Orders: Mounting interfaces, cooling pipelines and output characteristics can be optimized for large-volume orders to match customers’ exclusive chassis structures.

Conclusion

Difficult selection of front steering drive scheme, high coasting energy consumption for 4WD vehicles and complicated wiring of scattered electronic control parts are major pain points in electrification of 4–6 ton coaches and trucks!

Fengchuan Powertrain FC1D260-540Z 540V 60kW Electric Steering Drive Axle Assembly adopts innovative combination of AC induction motor, integrated steering axle and multi-in-one integrated electronic control. It perfectly fits front-rear 4WD vehicle layout and solves back EMF energy loss problem of permanent magnet front steering systems. Equipped with large-ratio load-bearing steering axle, IP67 automotive protection, complete VCU intelligent control, cooling system and wiring harness accessories, it supports both new vehicle development and fuel-to-electric conversion.

Whether for electrification projects of medium-duty cargo trucks, city electric buses or large sightseeing vehicles, this front steering electric drive axle can effectively shorten development cycle and reduce vehicle retrofitting costs.

Please contact Fengchuan Powertrain business team to obtain 3D drawings of steering axle, detailed performance parameters, sample test plans and bulk quotation for cooperation negotiation!

📞 Contact Information

• Phone: +86 188-8191-8080

• WeChat: 188-8191-8080

• Email: md@fcdltech.com

• Address: High-Tech Industrial Park, Yibin City, Sichuan Province, China