Analysis of Several Common Faults of Scroll Electric AC Compressor

The air conditioning system is a necessary system for pure electric vehicles, and the electric vehicle ac compressor, which is one of the main components of the air conditioning system, is the heart of the air conditioning system. Since the noise of the whole vehicle is low, it requires the noise of the compressor to be lower than 80 decibels, and the traditional vehicle scroll compressor cannot meet this index requirement. In addition, the traditional compressor has reached the bottleneck in terms of performance, energy consumption and refrigerant, while the pure electric scroll compressor can easily meet and exceed the above requirements. Therefore, electric ac compressor automotive have gained popularity. With the increase of electric compressors, the proportion of failures also gradually increased. This article here to elaborate several common faults of electric compressors and judgment methods.
 

Insulation Failure of Electric AC Compressor

1.the external causes:
(1) the compressor itself waterproof performance is not up to standard, the possible causes are as follows: plug protection is not in place, plug is not installed in place

2.the internal causes:
(1) compressor drive controller circuit board burned, resulting in capacitor burned possible causes are: voltage is extremely unstable; temperature is too high; harmonic current exists; component selection is unreasonable.

(2) motor turns short circuit will make the winding three-phase current unbalance. The winding coil of the inter-turn short circuit will produce a large loop current to make the coil seriously heated, further damage the insulation performance of the coil, to reach the insulation threshold of the whole vehicle when the vehicle can not start.
 

Start Failure of Electric AC Compressor

The compressor stops immediately after a few seconds of starting, and after this process is repeated 3 times, the whole car will be judged as compressor start failure. Possible causes of this situation are: 1) refrigerant filling error; 2) expansion valve or pipeline blockage leads to system pressure exceeds the threshold; 3) electronic fan does not work or condenser is too dirty; 4) evaporator surface temperature sensor or control panel failure; 5) compressor assembly failure (drive controller or phase current is too large to trigger the shutdown protection).
 

Concluding Remarks

With the popularity of pure electric vehicles in the market, pure electric vehicles with scroll compressor correspondingly increased, only a full understanding of its structure and working principle, to be able to accurately and quickly troubleshoot.