In recent years, with the development of the industry, new energy vehicles have gradually been widely used, and major manufacturers have also launched their own star products.As one of the most important components of electric vehicles, major manufacturers have chosen a suitable motor and used in their own products.When buying electric cars, how to look at the quality of the motor?
Car generator adjustment period principle
Because the rotor of the AC generator is rotated by the engine through the belt, the speed of the engine is transferred from a minimum of about 800 rpm to a maximum of about 6000 rpm.The output voltage of the machine has changed significantly, and it cannot meet the work requirements of automotive power equipment.In order to meet the requirements of the constant voltage of electricity equipment, the AC generator must be equipped with a voltage regulator to keep its output voltage basically kept constant under all engine conditions.
For the 12V automotive electrical system, the regulator regulates the output voltage range of the generator between 13.8-14.4 volts.
The output voltage of the generator depends on the turns of the generators stator coil, the speed of the generator, and the strength of the magnetic field to generate a magnetic field, and we can only adjust the strength of the rotor coil to generate magnetic fields.The voltage regulator controls the strength of the magnetic field by controlling the power current of the rotor coil.
Car motor purchase
Take a look at the principle of two detection principles
Look at: Look at the shell
The good motor made by the outer electroplating work is generally shiny, and the refurbage machine is gray and dim.You can look at the trademark of the motor. Generally, the larger manufacturers value the brand development will be marked. This is a manifestation of brand quality.Finally, you can see if the motor has 3C certification, and the motor that meets industry standards will be more secure.
Second hearing: Listening motivation
During the test, consumers can carry abundant power when they are moving, and those who are not motivated are likely to cut corners on the motor coil.
Three touch: touch temperature
After the motor is stopped, consumers can use their hands to perceive the temperature of the motor. The lower the temperature, the better the motor heat dissipation, and the better the performance.
Fourth detection: detection resistance
(1) Detect the quality of the three -phase motor
1. Shake the watch, the 500V shake is sufficient, and the insulation resistance value of the line on the motor shell on the three wiring columns, above 0.5m Euro, indicates that there is no short circuit in the ground.
2. Universal surface test: test the resistance value of the three phases of A/B/C, whether it is equal.The larger the values, the worse the motor performance.And the greater the motor power, the smaller the resistance value! But the three phases cannot be 0 euros. Unless it is a particularly large motor such as 50kW or more, this electric vehicle application can be said to have no.
(2) Detect the quality of the AC single -phase motor
1. Use a 500V meter meter to measure the insulation resistance of the motor winding and the shell, not less than 0.5 trillion Euros; use a multimeter to measure the winding of the winding winding, no disconnection, both meet the requirements, and the motor performance is better.
2. The multi -meter with a pointer to detect the capacitor is more convenient (there are also digital tables with capacitor files, which can be directly measured).
Dial the multimeter to a 1K or 10K resistance file, the two leads of the electrical container, quickly rotate to the right after rotating to the right, indicate that the electrical container is better; always bias the right side that the capacitor has been penetrated; the pointer is not moving.There is no capacity inside the capacitor.
(3) Detect the good or bad of DC motors
Use a multimeter to measure the voltage between the chip between the directioner. If there are no two pieces between the two pieces, the voltage has the same rules, indicating that the winding is normal.
Car motor cooling
The driver motor of electric vehicles is different from traditional motors.After using a driver motor, electric vehicles are generally no longer equipped with clutch, and vehicle transmission gears have become less or even canceled. The starting, acceleration, and high -speed driving of the vehicle depends on the motor.The internal resistance of the motor cannot be zero. Therefore, under the large current situation of the above driving, the internal consumption of the motor will increase sharply, and the internal consumption of the motor is almost all released in the manner.If the motor is not effectively cooled, the internal temperature of the motor continues to rise, resulting in a decrease in the efficiency of the motor. If the temperature is too high, the internal ablation or even breakdown will cause the motor to damage the motor.In addition, most motors have magnetic materials inside, and the temperature is too high, which will cause the stability of magnetic materials to decrease, decreases magnetic, and even disappears by magnetic properties, causing motor damage.Therefore, it is particularly important to control the working temperature of the motor (especially the highest temperature).
Common cooling methods of motor are air -cooled and liquid cold.It is more common to use air -cooled methods, such as small motors, AC motors, switching magnetic resistance motors, asynchronous motors, etc.; the liquid cooling method is mainly used in some permanent magnet motors.Theoretically, almost all motors can use air cooling or liquid cooling. The biggest difference is mainly reflected in the design purpose and power density of the motor.
If the vehicle installation space is large and the ventilation conditions are good, the weight requirements of the electric vehicle motor are not very harsh, and the air -cooled electric motor can be used.In order to save the vehicle space, reduce the volume of the motor, reduce the weight of the motor, and increase the power of the motor, the liquid cooling method can be used.
Because the air -cooled electric motor does not require heat dissipation water channels, the production and technology requirements are relatively low, and the cost is relatively low.The structure of the liquid cooling motor is complicated. Generally, the cooling water channel is arranged on the shell, and more stringent protection measures need to be added. Therefore, the cost is higher than that of the wind -cooling motor.In order to obtain the necessary cooling effect, the air -cooled electric motor is relatively large, and the surface is generally used to increase the heat dissipation area by the cooling grid, and it also needs to increase the heat dissipation fan at the closed end of the motor to increase the heat dissipation effect. ThereforeLarger.
Most electric vehicles, especially high -power electric vehicles, generally use liquid cooling motors.The liquid cooling motor needs to add additional electric water pumps and radiator devices to cool the motor.This increases additional power consumption, makes the structure more complicated, and has high layout and installation requirements.

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