How should the electric bicycle manufacturer choose the motor? According to what to choose the motor?
A: The most critical factor for motor selection for electric vehicles is the choice of motor power rating.
The motor power rating is generally divided into three steps:
In the first step, the load power P is calculated.
In the second step, according to the load power, pre-select the rated power of the motor and others.
The third step is to check the preselected motor. Generally, the temperature rise of the heat is checked first, then the overload capability is checked, and the starting ability is checked if necessary. All passed, the pre-selected motor was selected; it was not re-run from the second step until it passed.
It is forbidden to meet the load requirements, the smaller the rated power of the motor, the more economical.
After the second step is completed, the temperature is corrected according to the ambient temperature. The rated power is carried out under the premise that the national standard ambient temperature is 40 degrees Celsius. If the ambient temperature is low or high all the year round, the capacity of the motor should be fully utilized in the future, and the rated power of the motor should be corrected. For example, the annual temperature is low, the motor rated power should be higher than the standard Pn. On the contrary, if the annual temperature is high, the rated power should be reduced.
In general, in the case of determining the ambient temperature, the motor of the electric vehicle should be selected according to the riding state of the electric vehicle. The more the riding state of the electric vehicle can make the motor approach the rated working state, the better the riding of the electric vehicle. The line status is generally based on road conditions. For example, if the road surface in Tianjin is flat, a small power motor is sufficient; if a motor with a larger power is used, energy is wasted, resulting in a short mileage. If there are many mountain roads in Chongqing, it is suitable to use a motor with a higher power.
★ 60 degree DC brushless motor is more powerful than 120 degree DC brushless motor, right? Why?
A: From the market, it is found that when communicating with many customers, there is a common fallacy! It is considered that a 60-degree motor is more powerful than 120 degrees. We think this is probably a propaganda for manufacturers of 60-degree brushless motors. From the principle of the brushless motor and the facts, in fact, the 60-degree motor is also good, the 120-degree motor is worth mentioning! The so-called degree is only used to tell the brushless controller when to let the two phase lines of the turn on. No one is more energetic than anyone else! The same is true for 240 degrees and 300 degrees. No one is more energetic than anyone else.
