High-voltage electrical compressors have already been on the market for a while as they currently power most heating, ventilation and air conditioning (HVAC) systems in hybrid and electric vehicles. This means demand for replacements is growing and Nissens is meeting this demand.  

There are several advantages to the application of electrical compressors, and there are a couple of special features that differentiate them from a traditional belt-driven compressor. HV electrical compressors are compact devices that circulate refrigerant efficiently in the AC or heat pump loop, powered by an electrical motor capable of high torque operation. 

Automotive applications employ scroll-based technology where the refrigerant is compressed by rotation of a set of spirals. Compared to traditional belt-driven units, the design has fewer parts as there are no pistons, wobble plate mechanism or steering valves, in fact the only valve in the scroll system is a relatively simple metal valve to steer the refrigerant gas inlet and outlet within the compressor. 

Many compressor models have two connectors located on the assembly. The larger socket is for the HV connection to the vehicle's battery and for safety reasons, both the socket and the wiring to the battery are bright orange, which indicates HV. The second, smaller socket is for the compressor communication with the HVAC system's control unit. The control unit sends input signals to the PIM, which translates them and directly runs the compressor via voltage signals that control the commanded level of electrical current sent to the electrical motor. The level of the electrical current steers the compressor's output torque and the frequency of the signal controls the speed of the motor. 

The Nissens Automotive's range of thermal system components for new energy vehicles consists of more than 720 items and caters for in excess of 3,000 OE part numbers. The programme now extends to pressure and temperature sensors and electric high-voltage AC compressors, which further supports the independent sector and provides it with access to the critical parts of the future, strengthening Nissens' NEV technical expertise in the process.

Nissens point out that only qualified professionals with specialised training and certifications should replace a HV system and they must wear the appropriate personal protective equipment, follow safety rules and use HV tools. 

To learn more about new energy vehicle thermal systems, visit the Nissens Automotive expert knowledge portal at www.nissens.com/experts