A 400-watt electric bicycle does not work, is it really the case?
The hot discussion brought about by the introduction of electric bicycles and the new national standard has lasted for a long time, among which the discussion on the range and power experience (technology) is the most. It seems that the electric bicycle design speed limit and body size requirements are somewhat low, but it seems that you will not have this feeling in practical applications; because the parameter standards of each model and the target user population are very different, the following Let's analyze it with "motor power" as a reference.
The difference between the electric power is actually the speed standard of the vehicle. For example, as a "Bike·Plus" electric moped, the speed requirement of these vehicles is ≤25km/h. High-power motors are not needed to achieve this speed standard, because the concept of power refers to the frequency (number of times) of work done per minute. As long as the kinetic energy of a single work output is large enough, it will be easy to achieve this speed.
Key point: The speed standard of 25km/h is actually not low, because this type of vehicle is driven in a non-motorized lane; there are not only electric mopeds in the lane, but also ordinary bicycles and tricycles. What will the speed of these vehicles be?
According to various teaching materials, statistics and measured data, the average speed of actual cycling bicycle design is about [15km/h]. If the vehicle with transmission is based on good physical strength, the average speed is only 18km/h (5m). /s). Therefore, the speed of electric bicycles is not slow, and it is enough for students or middle-aged and elderly people.
The concept of "power" is the total number of times the motor does work per minute. Taking the bicycle as a reference, it is how many times the pedal is pedaled in one minute; the total kinetic energy (work) output by the pedal, the total number of quantified values, is actually calculating the total That's it.
As the electric bicycle sales terminal personnel, their technical level is generally very general, and there may be no concept of torque power horsepower at all. Therefore, when explaining the vehicle parameters, only the power horsepower is used as the evaluation criterion, which is misleading to the user.
If you want to be vigorous when choosing a vehicle, take a look at the parameters of the vehicle qualification certificate and choose the option with the largest torque. Perhaps the test "0-25km" acceleration results will be better than many electric motorcycles.
There is no need to worry about the cruising range, because the cost of ordinary lithium batteries (lithium iron phosphate) is already very low, even lower than some lead-acid batteries. And the energy density of this kind of battery (can be understood as energy storage) is four or five times that of a battery, so as long as the capacity is controlled properly, the cruising range of an electric bicycle using a lithium battery will be 50/100 kilometers compared to the previous electric motorcycle. The ability to improve.
Let’s talk about electric bicycles. The power standard of 400w is acceptable, and the safety of lithium iron batteries is also very high.