How to Choose the Suitable Motor for the Electrification Conversion of Wuling Journey MPV
Electrifying the Wuling Journey MPV requires careful selection of an electric motor that balances performance, efficiency, and reliability. For a vehicle of this size and intended use—typically urban commuting, family transport, or light commercial duty—the ideal motor must deliver strong torque at low speeds, efficient power delivery, and robust thermal management. Based on the target specifications of 336V system voltage, 32kW rated power, 60kW peak power, PMSM (Permanent Magnet Synchronous Motor) type, liquid cooling, 220 N·m torque, and 9,000 RPM max speed, here’s how to choose the right motor.
- Match Motor Type and Performance to Vehicle Requirements
The PMSM motor is the optimal choice due to its high efficiency, compact size, and excellent torque control—critical for stop-and-go city driving. The target 32kW continuous power and 60kW peak power align well with light-to-mid-duty EV conversions. Although the provided 120kW powertrain (rated at 50kW continuous, 120kW peak) exceeds these requirements, it can still be suitable if properly derated or controlled via software to match the battery and drivetrain limits. Alternatively, a smaller PMSM motor tuned to 32kW/60kW can be selected to avoid over-engineering and reduce cost and energy consumption.
- Voltage Compatibility is Critical
The 336V battery system must be compatible with the motor controller’s voltage range. The reference 3-in-1 powertrain operates on a 290–480V DC platform, which comfortably includes 336V. This ensures stable operation across the battery’s state of charge (SoC). Confirm that the motor controller supports 336V nominal input and has sufficient voltage headroom for regenerative braking and peak loads.
- Torque and Speed: Meeting Real-World Driving Needs
The target 220 N·m of torque is significantly higher than the reference motor’s 86 N·m rated torque. However, the peak torque of 240 N·m (0–4774 rpm) indicates the motor can deliver high instantaneous torque—ideal for acceleration. When paired with a 10.35:1 reduction gear, the wheel torque reaches 845 N·m (rated) and ≥2409 N·m (peak), more than sufficient for the MPV’s needs. Thus, even if the motor’s rated torque appears low, the gear reduction amplifies wheel torque effectively. Ensure the final drive ratio matches the MPV’s weight and intended performance.
- Speed and Power Delivery
A maximum motor speed of 9,000 RPM is achievable within the reference motor’s 15,000 RPM peak, indicating headroom for high-speed operation. At 5552 RPM rated speed, the motor delivers continuous power efficiently. With a 10.35 reduction ratio, the wheel speed reaches 536 rpm (rated), translating to a practical top speed when matched with tire size—ideal for urban and suburban driving.
- Thermal Management: Liquid Cooling is Essential
Given the liquid cooling requirement, ensure the motor and controller have integrated cooling jackets and are compatible with the vehicle’s cooling loop. The PT1000 temperature sensors and Resolver speed sensor in the reference system provide precise feedback for thermal and speed control—key for sustained performance. Liquid cooling prevents overheating during prolonged use, especially in hot climates or hilly terrain.
- Protection and Durability
The IP67 protection level ensures the motor and controller are dustproof and water-resistant—critical for reliability in wet or dusty conditions. The H-class insulation withstands high temperatures, enhancing longevity. For an MPV used in diverse environments, this level of protection is non-negotiable.
- Integration and Control
Choose a motor with a 3-in-1 integrated design (motor + controller + gearbox) to save space, reduce wiring complexity, and improve efficiency. The CAN bus communication (implied by modern EV systems) allows seamless integration with the vehicle’s BMS, VCU, and instrument cluster. Confirm compatibility with your battery system and ensure the controller supports required drive cycles and regenerative braking.
- Efficiency and Range
With system efficiency ≥92%, the reference motor minimizes energy loss—directly improving range. For a 336V system, pairing this motor with a ~40–60 kWh battery can yield a practical range of 200–300 km, depending on driving habits and conditions.
Conclusion
Selecting the right motor for the Wuling Journey MPV electrification means choosing a PMSM motor with liquid cooling, IP67 protection, and a matched reduction gearbox, capable of delivering 32kW continuous and 60kW peak power at 336V. While the 120kW 3-in-1 powertrain exceeds minimum needs, its high efficiency, robust cooling, and proven design make it a viable, future-proof option. Alternatively, a smaller, similarly specced motor can optimize cost and energy use. Prioritize voltage compatibility, thermal management, and system integration to ensure a reliable, high-performance electric MPV conversion.
