Most of the scooters on the market now are directly purchased from motors, that is, motors and batteries are sold separately. First of all, let’s talk about batteries and motors. Now, batteries on the market are divided into lithium ternary batteries, lithium iron phosphate batteries, and lithium iron phosphate/ternary hybrid batteries. Motors are generally divided into three types: brushless DC motor, brushless DC motor and permanent magnet synchronous motor.
Then is how to choose the most suitable scooter, according to your weight. For people with light weight, choose DC brushless motor. Let’s see the difference between brushless AC and brushless DC:
1、 Motor
Brushless AC motor: mainly DC brushless motor, which uses the interaction between the magnetic pole of the electromagnet and the rotating magnetic field of the stator to generate the rotating torque.
Brushless DC motor: use the characteristics of AC to form a certain angle between the rotor magnetic field and the stator magnetic field.
Permanent magnet synchronous motor: mainly composed of permanent magnet, coil and magnetic circuit, without excitation ring section. It has the characteristics of small size, high efficiency and being able to over-current.
2、 Controller
The controller is the brain of the scooter, which determines the speed, endurance and torque of the control motor. So when selecting the controller, we should focus on the following points:
- In terms of material, the controllers on the market are generally made of aluminum alloy, which is light in weight, good in heat dissipation, strong in oxidation resistance and corrosion resistance;
- Looking at the production process, there are three main production processes on the market at present: full-automatic welding machine, semi-automatic welding machine and manual welding machine.
- Look at the brand. Because controllers are electronic products, they are generally sold directly by brands and manufacturers.
- Look at the function. At present, the controller on the market is also divided into electronic power assist, electronic accelerator and automatic lock functions, which are also mainstream products in the market.
3、 Motor structure and principle
The working principle of brushless DC motor is the same as that of brushless DC motor. Both rely on armature to realize torque amplification. However, because the armature part of the DC brushless motor needs to work at high frequency, a transformer needs to be used between the rotor and the stator, which will produce high frequency vibration and electromagnetic radiation.