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Sound insulation tripled: sound insulation technologies for electric drives

Responding to the acoustic requirements of electric vehicles, Autoneum has extended its proven concepts of noise-reducing motor encapsulations to new applications related to electric drives. Hybrid-Acoustics PET and the foam-based alternatives Hybrid-Acoustics FLEX and Fit FLEX ensure optimal noise protection in electric cars and thus significantly improve driving comfort. The three technologies are characterized by high acoustic performance adapted to specific customer needs and zero waste production.

Disturbing noises such as the high-frequency sounds of electric motors and other electrical devices or the hiss of the gearbox pose new acoustic challenges for car manufacturers around the world. Early anticipating the growing demand for noise deadening components in the front and rear of electric cars, Autoneum has extended its well-established technologies for engine bay noise protection to new bespoke applications for electric vehicles.

With Hybrid-Acoustics PET fibrous technology and the two foam alternatives Hybrid-Acoustics FLEX and Fit FLEX, the Company offers three standardized technologies that reduce noise directly at the source, improving driver comfort. All three technologies are produced without waste and their ability to adapt to different sizes and shapes enables a wide range of uses in electric vehicles: from encapsulations of electric motors to noise and vibration reduction of inverters, gearboxes , pumps and compressors. By offering both fiber and foam based variants, Autoneum is able to flexibly meet each customer’s needs and preferences in terms of material, acoustic concept, durability and cost.

In terms of durable noise protection in the engine compartment, Autoneum’s patented Hybrid-Acoustics PET innovation sets the tone: it is made from 100% PET with up to 50% recycled fibres; production cuts are recovered, processed and reused and the material can be fully recycled at the end of the product’s life. The unique textile technology, which is part of the company’s Autoneum Pure sustainability label, is particularly suitable for dampening high-frequency sounds from the electric drive unit and provides an optimal balance between absorption and insulation. Additionally, Hybrid-Acoustics PET components are up to 40% lighter than standard isolators.

To meet the different preferences of car manufacturers, Autoneum has supplemented its lightweight textile technology with two foam-based alternatives. As the foam is injected in both technologies, no waste is generated during production either. Hybrid-Acoustics FLEX is based on the same acoustic concept as Hybrid-Acoustics PET, but the decoupler is foam instead of felt. Autoneum’s Fit FLEX, on the other hand, combines the foam decoupler with a heavy injection molded layer. Thanks to the great geometric adaptability of the foam to even complex shapes, both technologies offer exceptional acoustic performance in the insulation of electric motors and other sources of noise in electric vehicles. In addition, the sound-absorbing or insulating quality of the foam can be flexibly adapted to specific customer needs.

Autoneum’s innovative noise reduction technologies for electric motor encapsulations and other noise emitting parts in electric vehicles are available in Europe, North America and China.