The QS138 70H motor is a high-performance mid-drive motor specifically designed for electric motorcycles and electric dirt bikes. Here are some key features and specifications of this motor:
- Motor Type: BLDC (Brushless DC) inner rotor motor with hall sensors.
- Rated Power: 3000W, with some tests indicating it can provide up to 28kW peak power momentarily.
- Rated Voltage: Typically 72V, but versions with a range of 48-96V are also available.
- Speed: Basic RPM is 4000 without load, and it can reach over 6500 RPM with field weakening.
- Maximum Torque: Approximately 56N.m (without considering the reduction ratio), with some sources even mentioning a maximum torque of 98N.m.
- Motor Dimensions: Diameter 138mm, length 234mm.
- Weight: Approximately 12.5kg/14kg (net weight/gross weight).
- Reduction Ratio: Built-in gear reduction ratio of 1:2.35, with some references to 45/19 (approximately 2.36:1) helical gears.
- Efficiency: Maximum efficiency can reach over 90%.
- Battery Current: Peak battery current is 120A (72V).
- Working System: S9.
- Cooling Method: Air cooling.
- Waterproof Rating: IP67.
- Application: Suitable for electric light motorcycles, such as dirt bikes, with a weight of approximately 128kg plus two 80kg loads, and a continuous speed of up to 100km/h.
- Tire Size: Recommended to use 130/70-17 tires.
- Installation: Suitable for installation at the rear of the vehicle to save space for battery installation.
- Support Features: Supports regenerative braking.
This motor is popular in the market for its compact design, powerful output, and built-in gear reduction mechanism, making it particularly suitable for applications that require high power output in a small space.
