Tips to buy electric cars vehicle structure is very simple electric tricycle, the basic unit is the frame, plastic parts, shock absorption, batteries, controllers, motors. The quality of the frame is particularly critical, many users do not care about the quality of the frame, because this part is difficult to observe. But the quality of the frame directly determines the safety performance of the vehicle, the following provides several ways for you to verify the frame. First observation of plastic parts inside the vehicle frame welding level, if there is a false welding, sealing off the case, indicating that the quality of the frame is not ideal. Second, observe whether the frame has rusted signs Shandong electric tricycle manufacturers, because the need for a frame in order to prevent rusting process called electrophoresis Which is cheaper electric tricycle, many frame manufacturers in order to control costs, but simply spray black no electrophoresis, if a new car that is rust problem, it shows the quality of the frame electrophoresis abnormal. The last test, high speed and then the brakes electric tricycle top ten brands, to see whether there is sloshing around the frame, if the rock is very powerful, indicating frame quality tests, there are security risks. Because the electric car market was mixed, the frame is hidden in the interior of the vehicle can not be directly checked, so many manufacturers to control the quality of the frame is not critical. To pick a good frame of the vehicle is very important. There is also a simple way to remove the battery if the vehicle, you can try to hold up the weight, the heavier the description of the vehicle the more solid material, the greater the likelihood of better safety performance. Electric car fault diagnosis are the following nine direction: 3) How to Detect A brushless motor and the motor harness plug unplug all with a multimeter diode file, the multimeter red needle means six-pin plug on the motor thin red line, black? Fine needle means yellow, blue, green and black lines, numerical display of 900 or more, the red needle means black line refers to the fine needle black yellow, blue, green and red, numerical display 500-600. Display zero or infinity is bad. The B-energized state, with a multimeter 200 volt DC voltage profile, black six-pin connector pin means thin black line, refer to the fine red needles yellow, blue, green line, the rotation of the motor, the voltage display of 0-6.25 V between changes. Maximum and minimum three wires should be less. 4) How to detect turn to? 20 volts with a multimeter to measure the voltage profile controller nine-pin plug, black pen means thin black line, red pen refers to the fine yellow line, then the voltage should be about 1 volt, will be transferred to the turn in the end, a multimeter display volts to 4.2 volts or 4.8 volts, then turn to be good. Latest elderly electric tricycle | White Dragon Machinery (certified) | electric tricycle provided by White Dragon Shandong Machinery Co. White Dragon Shandong Machinery Co., Ltd. (www.bailonggrp.com) Shandong Linyi, bicycles, tricycles and accessories leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In the White Dragon machinery leadership with the staff warmly welcome all inquiries negotiations to create a better future for White Dragon machinery.