The compressor is always driven by the electric motor, so when the hybrid or electric engine isn’t on, the eCompressor can still operate.” This offers a significant advantage over traditionally fuelled vehicles as it maintains a cool temperature in the cabin. “The electric compressor operates independently of the engine. ![]() The internal electric motor of the eCompressor enables the A/C to continue running, even when the hybrid or electric engine is idling or switched off.In addition, due to its small size, DENSO’s eCompressor consumes less energy, extending the lithium-ion battery range.The less energy you use to drive the compressor, the more you can use to drive the hybrid or electric vehicle so your vehicle range will increase if the eCompressor offers high performance at low revolutions.” Richard explains, “When you control the electric compressor speed, you also control the energy consumption. Controlled revolution speed which contributes to the saving of energy.DENSO’s latest generation of eCompressors places the inverter in-line with the motor, making the design lighter and slimmer, thus saving more under-the-hood space.ĭENSO’s eCompressor design has a range of benefits for hybrid and electric vehicles: In order to insulate the electric motor and compressor housing, compressor oil with high insulating properties is used.ĭENSO has been mass-producing eCompressors since 2003 and was the first in the world to integrate an inverter with a compressor into one component. The electric motor runs at a high voltage of 200V or greater, and is cooled by a refrigerant, since it generates heat while operating. Oil separator – compressor oil can reduce cooling performance, therefore a separator is used to separate oil from the refrigeration cycle to improve A/C cooling capacity.Moreover, the A/C ECU inputs compressor rotational speed signals to the inverter via the HV ECU to control the rotational speed of the electric compressor. The inverter converts Direct Current (DC) from the HV battery into Alternating Current (AC) for the motor. ![]() A DC brushless type that uses a permanent magnet as a rotor, and a coil for the stator. Compressor section – contains a scroll type compressor to draw in, compress and discharge refrigerant.What is an eCompressor and how does it work?Ĭonventional compressors are powered by an engine’s belt drive, however electric vehicles do not have belt-driven engines, therefore a different kind of compressor is required.ĭENSO’s eCompressor consists of the following components: It’s clear that in future the performance of the A/C system will become increasingly important, and this article aims to provide insight into a crucial component, the eCompressor, plus offer some useful maintenance tips. But if the A/C fails in an electric vehicle, the car will not run, as it’s a safety risk: the battery will get too hot,” explains Richard Groot, A/C product specialist at DENSO AM. If the A/C fails in a ‘normal’ car, you can still drive and simply open a window. ![]() “It’s a different approach for workshops who are dealing with A/C in hybrid or electric vehicles. There are some significant differences to be aware of, one of which is the purpose of the A/C system, which in hybrid and electric cars not only cools the cabin but also the battery which powers the vehicle.
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