Mid drive motor SIAJ138A-80 3500W Gear Motor stands as a top-tier solution, engineered as a Permanent Magnet Synchronous Motor (PMSM) with integrated gear reduction, it delivers exceptional power, torque, and durability—perfect for e-scooters, e-motorcycles, and custom high-performance EVs.
Designed to balance raw performance with reliable operation, it’s the ideal choice for those demanding excellence from their EV’s powertrain.
Core Specifications: Engineered for Peak Performance
· Motor Type: 138 Reduction IPM PMSM (Interior Permanent Magnet Synchronous Motor) with a 2.47 gear ratio for optimized power transmission.
· Power Output: 3500W rated power, 13000W peak power—supports long-term operation at 2x rated power and 2.5x overload for up to 1 minute.
· Voltage & Speed: 72V DC operating voltage; 5600rpm rated internal speed (supports high field weakening up to 6500rpm).
· Torque & Efficiency: >52Nm internal maximum torque; maximum efficiency ≥91% (peaking at 91.5% in testing), minimizing energy loss.
· Key Components: 5 pole pairs, 60° phase angle, HALL sensor for precise control, and KTY83-122 thermistor for temperature monitoring.
· Build & Protection: IP67 waterproof rating (dustproof and water-resistant), Class F insulation (max winding temperature 150°C), and 16mm² power phase wires (22.5mm² winding) for stability.
· Cooling & Duty Cycle: Natural cooling system paired with S9 duty cycle, ensuring reliable performance under continuous use.
Why a Mid Drive Motor?
Mid drive motors excel by integrating with the EV’s drivetrain, and this model amplifies those benefits:
1. Superior Power & Torque Delivery
The integrated gear reduction (2.47 ratio) multiplies torque, making steep hill climbs, heavy loads, and rapid acceleration effortless.
With 13000W peak power and >52Nm torque, it outperforms hub motors in demanding scenarios—ideal for high-performance EVs.
2. Balanced Weight Distribution
Mounted at the vehicle’s center, this mid drive motor ensures even weight distribution, enhancing handling, stability, and maneuverability.
Unlike wheel-mounted hub motors, it prevents “unbalanced” weight shifts, critical for safe high-speed or off-road use.
3. Durability for All Conditions
IP67 waterproofing means the motor withstands rain, puddles, and dust, while Class F insulation and thermal monitoring protect against overheating.
Its rugged design is built to endure the rigors of daily commutes, commercial fleet use, and recreational rides.
4. Precise Control & Efficiency
Equipped with a HALL sensor for accurate speed and torque control, the motor operates seamlessly with compatible controllers (current limit ≤100A).
The ≥91% efficiency rating maximizes battery range, ensuring more power is directed to propulsion—not wasted as heat.
Test-Proven Reliability
Under rigorous testing at 72V, the SIAXDJ138A-80 delivers consistent performance:
Maximum output power of 12780W at 5069.7rpm.
Peak torque of 52.21Nm at 1160.8rpm, validating its heavy-duty capabilities.
Stable efficiency across load points, with overall efficiency reaching 91.5% at maximum performance.
Ideal Applications
High-performance e-motorcycles and e-scooters.
Custom EV builds (e.g., electric dirt bikes, utility vehicles).
Commercial fleets (delivery scooters, rental EVs) requiring durable, high-torque powertrains.
Enthusiasts seeking to upgrade their EV’s performance with a reliable mid drive solution.
Why Choose the SiAECOSYS SIAXDJ138A-80 Mid Drive Motor?
It combines power, precision, and durability in a purpose-built package. Backed by SiAECOSYS’ expertise in EV powertrains, this mid drive motor delivers consistent performance for both personal and commercial use. Whether you’re building a custom EV or upgrading an existing one, it’s a reliable investment that elevates your vehicle’s capabilities
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