Battery management system is an important part of new energy vehicle. It can effectively reduce the failure rate of vehicle and improve the battery life ability in the aspect of power battery design. In many automobile production, the precision shunt is used to optimize the battery management system, which effectively reduce a lot of failure rate. Apart from this, it is also very important to ensure the normal operation of the motor effectively. The following analysis is carried out through several aspects.
 

For the three-phase asynchronous motor in the power battery test system of the new energy vehicle, the difference between the average current of any one phase and the other two phase current is not allowed to exceed 10% in order to ensure the safe and normal operation of the motor. If the current value of the single phase and the average current of the other two phases exceed the prescribed limit, it is indicated that there is a fault of the motor, the reason must be found out and the fault must be removed before it can continue to run, otherwise, the accident of burning out the motor will occur.
 
The main reasons for the overload operation of the motor in the power battery test system of the new energy vehicle are that the driving load is too large, the voltage is too low, or the motor is stuck and so on. When the motor of the power battery test system of the new energy vehicle is in the state of overload, the speed of the motor will decrease, the current will increase, the temperature will rise, and the winding coil will overheat. If the motor is overloaded for a long time, the insulation aging failure of the motor at high temperature results in the burnout of the resistors and other electronic components, which is the main reason for the burnout of the motor.
 

 

 

The new energy vehicle power battery test system motor must always keep the inlet clean. If the dust, oil and water are inhaled into the motor, a short-circuit medium will be formed, which will damage the insulation layer of the conductor, cause inter-turn short circuit, increase the current, cause damage to the resistor and other electronic components, and the temperature will rise and the motor will burn down.
 
Secondly, it is necessary to regularly check whether the temperature of the motor bearings, stator, shell and other parts of the power battery test system of the new energy vehicle is abnormal, especially for motors without voltage, current and frequency monitoring facilities and no overload protection facilities. The monitoring of temperature rise is especially important.
If it is found that the temperature rise near the bearing of power battery test system of new energy vehicle is too high, stop immediately to check if the bearing is damaged or lacking oil. If the bearing is damaged, the new bearing should be replaced before operation. If the bearing is short of oil, grease should be added, otherwise, the bearing will further damage and lead to collapse of the frame, resulting in cleaning and burning of the motor.
 

If the motor of the power battery test system of the new energy vehicle appears vibration, it will cause the different axis degree of the machine and equipment connected with it to increase, make the motor load increase, the current rise, the temperature rise and destroy the motor. Therefore, in the operation of the motor, it is necessary to check whether the anchor bolt, motor end cover and bearing cover are loose or not, whether the connection device is reliable or not, and to solve the problem in time.