The efficiency of electric vehicles is a comprehensive manifestation of the efficiency of the electric hub, the efficiency of the control system and the mechanical rotation loss, but it mainly depends on the efficiency of the electric hub (motor), which can be reflected in the riding mileage under the same battery and the same riding load conditions. For users, it is undoubtedly correct to buy a more efficient electric vehicle.
However, the efficiency of electric vehicles also needs to have a range, because the motor efficiency is different under different torques, expressed as a saddle curve form. Some electric vehicles have higher efficiency at low power. Once the output torque increases, The efficiency value drops sharply. This kind of car housing is characterized by a fast speed on a flat road. Once the speed on the uphill slope drops sharply, the power consumption level will also increase substantially.
Replacing the concept of pure rated efficiency with the concept of efficiency range is an important feature of electric bicycles, because the vehicle load is a very variable load, and its operating point will vary with the load status of the vehicle, road gradient, and driving wind resistance. Great changes have taken place, and it is meaningless to pursue the high efficiency of a certain work point while ignoring the efficiency characteristics of the entire work area.
Electric vehicles refer to the area where the efficiency value is greater than 70% or more as the electric vehicle efficiency range, which is generally 100-400W, which means that this motor can maintain an efficiency state of more than 70% in the range of 100W-400W, and the highest efficiency To reach more than 80%, the efficiency of common working points (such as 130W) and maximum working (400W) should reach more than 75%. Some motors with poor performance on the market may have an efficiency of over 80% at the maximum efficiency point, but the efficiency range is very narrow, generally 80W-180W. People with a heavier weight will consume electricity when riding this electric car. The battery is also easily damaged. The user can use the method of changing the load to identify whether the efficiency range is narrow. This is an example of an electric vehicle where the vehicle speed is fast when the load is light and the speed drops rapidly when the load is heavy (heavy load or climbing a steep slope).