We all know the four major accessories of electric vehi […]
We all know the four major accessories of electric vehicles, batteries, motors, chargers, and controllers.
The motor should be brushless as far as possible. As for motors, there are mainly two types: brush motors and brushless motors. In general, brushless motors replace mechanical commutation with electronic commutation, which is technically superior to brush motors. At the same time, the brushless motor has no gear or reduction gear, which reduces the unreliability of motor wear. Its efficiency is higher than that of brushed motors within a certain current range. The brushless motor runs almost without noise and has a life span of more than 10 years. Of course, the price of the brushless motor itself is relatively high, and the controller is more complicated, and the cost is also higher. But at present, compared with brush motors, brushless motors will increasingly become the mainstream of the market.
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Precautions for buying an electric car.
First and foremost, the formalities are invoices, certificates, warranty cards, manuals, hard and soft certificates. For the three nos, remember not to buy. The invoice is the most important thing. The car can have nothing, as long as there is an invoice, It can be considered a regular car.
Second, check the appearance to see if the surface of the paint and electroplating parts are intact; check whether the auxiliary functions of the vehicle, such as power display, speed, mileage display, etc.) are in normal state.
Third, check accessories. The strength requirements and performance requirements of electric vehicle parts should be higher than bicycles. When purchasing, the user looks at the quality of the selected parts of the vehicle. For example, whether the welding of the frame and the front fork and the front surface are defective, whether all parts are manufactured well, whether the dual supports are strong, whether the tires are brand-named, whether the smart parts are rust-proof, etc.
Fourth, perform the actual operation according to the manual and check the working status of the whole vehicle. The speed adjustment transition should be smooth, without shock at start, the wheels should be flexible, without heavy feeling, the wheel rotation sound should be soft, no abnormal noise, the brake should be moderately tight, and the brake should be reliable.