How do we choose a battery based on the motor?

How do we choose a battery based on the motor?

Aug 23, 2023创易达

1.Which type of electric bike motor is the best? Hub motor? Rear-drive motor? Front motor?

For example, the rated voltage is different. Now the mainstream ones are 48V, 60V, and 72V. For example, the power is different. The common motor power is 400W, 800W, and 1200W.There are 350W, 400W, 500W, 600W, 800W, 1000W, and 1200W, and the greater the power value, the greater the power consumption when the electric vehicle is running. It will also get worse.If it is city commuting or commuting, many people do not have high requirements for travel time, within 20 kilometers every day, and the one-way trip will not exceed 10 kilometers. Of course, the motor with a power of 350W to 400W is the first choice here.

The electric bike motor is an integral part of the frame and cannot be easily replaced like other components. Therefore, before purchasing your next electric bike, it's important to understand all the information below.

The best electric bike motor will strike a balance between power and weight, providing maximum pedal assistance without overly compromising the bike's weight or impeding its performance. It's worth noting that the electric bike motor is a fundamental part of the bike itself and not a component that can be easily replaced or upgraded. Therefore, it is important to assess your own situation when choosing the best electric bike.


2 types of motors

Despite all the benefits of electric bikes, they can also cause confusion and ownership anxiety due to the steep learning curve associated with the technology that drives these bikes. As with any electric product, the logic of delaying the purchase is the best approach to benefit from the latest technology advancements.


However, if you don't even know where to start, we are here to help alleviate some of the confusion surrounding the best electric bike motors and their functionalities.

2.1The rear hub motor

Rear drive hub motors—HR series is known for its powerful and efficient. With a power output of 250W, it can provide the rider with up to 45Nm of torque support even on longer trips, while still being very cost-effective in terms of battery consumption.Electric hunting bikes can be equipped with any of the three types of motors, each offering different performance on various terrains. The rear hub motor (placed in the rear wheel) generates a significant initial power and is a practical choice as it requires less maintenance and is typically more affordable. However, its low torque makes it weaker when climbing steep paths.

2.2The Front-drive hub motors

In comparison to the rear hub motor, the mid-drive motor (positioned between the bike pedals) provides stronger torque. Therefore, it can climb better and more effortlessly. The downside is that bikes equipped with this motor may be more expensive and require more maintenance.

Lastly, the Ultra Mid-drive motor offers the best control and performance among the three types.

Front-drive hub motors—the HF series are lightweight and well-suited for modern city bikes. The 250W power output and harmonious riding assistance can meet your daily urban travel needs. Small in size, ultra-light, efficient, smooth and quiet, this drive system is ideal for the lightweight and stylish city bike. Compatible with disc brakes and V brakes, with a rated power of 250W and a maximum torque of 30Nm.


3How to choose a motor?



In addition, the performance of electric vehicle motors with the same power, which is matched with different types, models, and capacities of batteries, it is also different. When purchasing an electric vehicle, users need to consider both the size of the motor and the size of the battery. Only when the parameters of the motor and battery match can the best performance of the two be achieved. The choice of battery and motor cannot be matched blindly, otherwise it will cause greater strain to the motor and battery, which is what car owners need to pay attention to.


Choose the power of the motor according to the power required by the production machinery, so that the motor can run under the rated load. We recommends that you should pay attention to the following two points when choosing power:


If the motor power is selected too small. There will be a "small horse-drawn cart" phenomenon, resulting in long-term overload of the motor. Its insulation is damaged due to heat. Even the motor was burned.


If the motor power is selected too large. There will be a "big horse-drawn cart" phenomenon. Its output mechanical power cannot be fully utilized, and the power factor and efficiency are not high, which is not only unfavorable to users and the grid. And also can cause the waste of electric energy.To correctly select the power of the motor, the following calculation or comparison must be done:P=F*V/1000 (P=calculated power KW, F=required pulling force N, line speed of working machine M/S).For the constant load continuous working mode, the power of the required motor can be calculated as follows:P1(kw): P=P/n1n2,In the formula, n1 is the efficiency of the production machinery; n2 is the efficiency of the motor, that is, the transmission efficiency.The power P1 obtained by the above formula is not necessarily the same as the product power. therefore. The rated power of the selected motor should be equal to or slightly greater than the calculated power.

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