#Ac compressor series

A DENSO eCompressor also consumes less energy, which helps to extend the range of the HV battery pack.Controlled revolution eCompressors provide high performance at low revolution speed, which saves energy and the less energy that is used to drive the compressor, means more can be used to drive the vehicle and its usable range will increase.The design of DENSO eCompressors brings several benefits to hybrid and electric vehicles: Therefore, using the wrong oil brings a big risk of damaging the motor. The electric motor runs at more than 200 volts and is cooled by refrigerant and oil mix, so a special, insulating compressor oil is required to prevent failure of the motor. The AC electronic control unit (ECU) inputs compressor rotational speed signals to the inverter via the HV ECU, to control the rotational speed of the electric compressor Inverter – drives the motor and converts DC from the high voltage (HV) battery into alternating current (AC) for the motor.Electric motor – a direct current (DC) brushless type, using a permanent magnet as a rotor and coil for the stator, to drive the compressor.Compressor section – scroll type compressor to draw in, compress and discharge refrigerant.What is an eCompressor and how does it work?Ĭonventional compressors are powered mechanically by the engine’s auxiliary drive belt, but as electric vehicles don’t have an engine that needs a belt-driven drive system, an eCompressor is required. “The AC system is therefore an integral element in the vehicle’s correct operating parameters and must be maintained accordingly, this includes the compressor, which in these vehicles is electrically driven and so defined as an eCompressor.” “If the AC system in a ‘normal’ car fails, you can still drive, but if it fails in an electric vehicle it won’t run, as the battery temperature is no longer controlled,” explains Richard Groot, AC product specialist at DENSO AM. When it comes to their function, while both are designed to provide the vehicle’s occupants with the most comfortable cabin environment, the AC system in a hybrid or electric vehicle also has the vital job of cooling the battery that powers the vehicle.

#Ac compressor series

This was a prerequisite for the series installation of air conditioners in compact class cars.Although there are naturally many similarities between the air conditioning (AC) systems in hybrid and electric vehicles and those powered by a traditional combustion engine, there are also several distinctions, not least in the compressor, which is the component at the heart of both. The compressors used in modern vehicle air conditioning systems are of compact, lightweight design. When the air conditioning system is switched on, the belt drive is set in motion by a magnetic clutch. The compressor is attached to the engine block and is driven by a pulley and a V-belt. It is then drawn in again by the compressor, where it is compressed. Here, the refrigerant absorbs the heat of the air flowing into the passenger compartment and turns back into gas at the evaporator. It is then routed to the area to be cooled. The refrigerant gas warmed in the course of compression is conveyed via pipes to the condenser, where it liquefies again, giving off heat in the process. The cold vapour is then compressed by the A/C compressor. The resultant lower pressure makes the refrigerant evaporate at low temperatures. This in turn leads to a drop in pressure in the evaporator. The compressor draws in the refrigerant gas from the evaporator. Overheating of the compressor on account of insufficient refrigerant or compressor oil in the system.Seizure of the compressor due to poor lubrication if viscosity is reduced for example by an excessive amount of UV contrast agent or the use of unsuitable universal oils.Poor conveying of refrigerant as a result of incorrect control valve actuation.The following are also possible causes of compressor damage: It is advisable to start by checking whether the compressor shaft is turning or whether there is a problem with the magnetic clutch or overload safeguard. If damage occurs, the first step is to establish the cause of compressor failure. Flushing-out of the lubricating oil film between piston and cylinder wallĭamage to the A/C compressor affects the entire air conditioning system.If this were to happen, it would have the following consequences: As liquids cannot be compressed, they must never be allowed to enter the compression chamber. The design of a refrigerant compressor means that it is only able to convey gases and vapours.