Four key to distinguish the merits of electric motor vehicles

Electric car motors like the electric car "heart", the same set of 48V 20AH lead-acid batteries, high-quality good efficiency of the motor can run 45-55 km, so buy electric car must pay attention to choose high-quality accessories. So how can we distinguish the cargo electric bike motor and cons?
Since the motor is sealed, if it's good or bad judgment fundamentally, it needs some external tools, such as words table. In addition to the help of professional tool, you can also be judged from the appearance of materials and general performance. The above methods can simply be attributed to: a look at two three four touch detection.
A look: Look housing. The outer plating work to do good motors general appearance of relatively bright, refurbished machines gray and relatively dim. Then you can see the motor marks, generally larger manufacturers will be marked with the brand value development, which is a manifestation of the brand quality. Finally, you can see whether the motor 3C certification, motors comply with industry standards will be more secure.
Second touch: touch temperature. After the motor has stopped consumers can hand to sense temperature of the motor, the lower the temperature, the better the motor heat dissipation, the better the performance.
Three: to listen to power. When commissioning, consumers can load start-up power is abundant, with plenty of power is not likely to cut corners on the motor coil.
Tetra Detector: sense resistor. 1, the detection phase AC motor is good or bad shake table, 500V shake table to shake the three terminal lines on the insulation resistance of the motor housing, in 0.5M over Europe it means not to be short-circuited. 2, multimeter test: test A / B / C three phases of the resistance, are equal. The larger the difference between the value of the motor performance worse. And the greater the motor power, the smaller the resistance! But not the three-phase are zero in Europe, except as above 50KW motor particularly large, but the current foldable bike electric applications can say no.