openPR Logo
Press release

KACO Shaft grounding rings for electric vehicle propulsion systems

10-11-2019 04:00 PM CET | Industry, Real Estate & Construction

Press release from: KACO GmbH + Co. KG

Source: KACO GmbH + Co. KG

Source: KACO GmbH + Co. KG

The electrification of powertrains is in full progress. Besides systematically applying established sealing technology in hybrids and e-drives, KACO is offering innovative e-mobility products since a couple of years. For reliable operation of electric engines, KACO developed a product portfolio for shaft grounding rings. KACO shaft grounding rings are providing an excellent bearing protection over lifetime. The specifically dedicated, high-performing test facilities ensure functionality of the shaft grounding rings under real life conditions for already established and future e-mobility specifications.

The increasing power density within high voltage systems for electrical and hybrid vehicles requires solutions for the electrical traction machines, that guarantee a constant and stable electrical connection of the rotor shaft to the grounded housing. Besides interference frequency for the radio there is a considerable risk for bearing destruction caused by induced shaft voltage. If no proper grounding system is installed, an undefined current flow may result in bearing currents,. The potential differences may have different reasons, as for instance an asymmetrical design of the stator sheet package or the stimulation of the frequency converter. Unintended bearing currents result in local destructions of the bearing surfaces like pittings, white etching cracks and washboard like structures, ending up in a complete bearing failure. As experience shows, the application of isolated bearings (e.g. ceramic) does not solve the problem. This measure redirects unintended current flow to the gearwheels of reductor transmission, which gradually will destroy their metal surfaces. Furthermore, critical interference noise for mid frequency can not be avoided isolated bearings. Depending on the vehicle’s registration country, this is even a safety topic when traffic broadcast is affected.

KACO shaft grounding rings have been developed for electric vehicle propulsion systems. They are ensuring a permanent electrical connection between rotor shaft and grounded housing for preventing metallic bearings from unintended harming currents. Grounding rings protect metallic bearings from damage and prevent from interference noise for mid frequency. This was made possible by using a highly conductive PTFE disc with special coating. KACO shaft grounding rings are intentionally optimized in line with the specifications of electric propulsion systems. They are in series application designed for circumferential speeds of up to 45 m/s within a temperature range between -40 and 140 °C. Even though this covers nearly all currently known series applications, further optimizations and alternative solutions for higher circumferential speeds are already at testing stage. Within a dry running system, the electrical impedance is around 5Ω between rotor shaft and housing. In summary KACO’s specifically designed solution offers effective protection for bearings and gear wheels, a significant reduction of impedance over lifetime, being fully independent from the rotation direction of the shaft. Recent development for new shaft grounding systems with a purpose design for electric motors of highly integrated e-drive systems using oil mist for cooling is shortly before market introduction. Due to the specialization of development and production of shaft grounding rings, KACO is first choice for system engineering of grounding applications.

Use case tested under real life conditions
In close cooperation with OEMs and automotive system suppliers KACO has proven the performance of its shaft grounding ring portfolio by developing specific test rigs. Measurement methods and analysis algorithms have been developed for the specific requirements of e-mobility. Available test programs for KACO shaft grounding rings are application specific tests as well as various mechanical, chemical and climatic tests. Based on the investment in specific test benches, KACO is able to evaluate load profiles of the shaft grounding rings in consideration of high speed, minimum and maximum temperature or dynamic runout of the system. Based on the specific KACO competences material pairing and friction optimization, application-oriented design for radial force, temperature behavior and related wear for the contact zone can be engineered. This is the reason why KACO is your preferred choice in developing and applying shaft grounding solutions for e-mobility.

„Solution-oriented material and product engineering supported by specifically created test facilities have been the success factors for the development of our shaft grounding rings. Analytical deep dive on existing solutions for shaft grounding products systematically lead us to the creation of a robust, compact and cost optimized product portfolio. The new material combination of highly conductive PTFE with silver coating is overcoming known disadvantages of alternative solutions for shaft grounding. Depending on the application, a specific running sleeve can further improve the low impedance connection. It has proven to be right that we allocated dedicated resources for the development and testing of our shaft grounding rings years ago. This engineering and testing setup gives us the position to significantly add value to our customers’ development of electric propulsion systems” explains Vice President Research & Development Andreas Genesius.

KACO GmbH + Co. KG
Industriestraße 19
74912 Kirchardt
www.kaco.de/en
072669130-0

The Expert for Sealing Systems
KACO GmbH + Co. KG, a subsidiary of the Zhongding Group, is one of the world’s leading developers and manufacturers of high-precision, practical sealing solutions for the automotive and mechanical engineering sectors. The company, with its headquarters in Germany, has earned a reputation for the highest quality sealing solutions and innovative power as well as for expertise in development and production. KACO has six production facilities in Germany, Austria, Hungary, China and the USA and delivers products across the globe. A trusted partner of the automotive and supplier industry, the company has been keeping pace with the high demands and technical changes of the industry for decades.

This release was published on openPR.

Permanent link to this press release:

Copy
Please set a link in the press area of your homepage to this press release on openPR. openPR disclaims liability for any content contained in this release.

You can edit or delete your press release KACO Shaft grounding rings for electric vehicle propulsion systems here

News-ID: 1846750 • Views: 426

More Releases from KACO GmbH + Co. KG

Development competence of the sealing expert KACO
For the sealing expert from Kirchardt, tradition and progress are not opposites, but the basis for the company's success, which began over 100 years ago. KACO regards knowledge and experience of its employees and its development, application and system competence as the most important resource. Together with its customers, the company will continue to be on the pulse of the times in order to bring new innovative products and solutions
EvolIft - Lift Off for minimal friction
In order to achieve the European Union's climate protection targets, CO2 emissions at fleet level must be reduced to < 60g CO2/km by 2030. The contribution of the sealing industry is, to reduce power losses to a technically possible minimum. KACO has further developed a principle based on turbine technology to enable its application in the automotive sector as well as in other industrial areas. The dynamic seal with the
Face Seals for Rotor Shaft Cooling of Electric Engines
In times of an increasing electrification of powertrains technical solutions are required to prevent the electrical engines from overheating. For that use case the expert for sealing solutions developed face seals for rotor shaft cooling to directly cool down the shaft of the rotor internally. KACO’s face seals that have been specifically developed for rotor shaft cooling are axial acting systems for high speed (up to 37 m/sec), pressure application (up
Simplicity solves complexity – venting caps by KACO
The expert for sealing solutions meets highest specifications. By presenting the patented venting cap KACO offers a rather simply looking rubber product matching a well-known complex task for breather systems. Application scope for KACO venting caps: In applications like gearboxes, axle drives, battery housings but also ECUs there is basically a need for ensuring constant venting or breathing conditions, as for instance pressure differences based on temperature change need to be

All 5 Releases


More Releases for Source:

Noise reduction at source
AneCom AeroTest tests innovative aero engine FAN For the noise reduction research of leading aero engine manufacturers AneCom AeroTest tested an innovative aero engine FAN in its anechoic chamber. The tests included the examination of several components before and behind the FAN and their impact on dynamical and acoustic characteristics. With the help of the quickly convertible UFFA-Rig (Universal Fan Facility for Acoustics-Rig) the tests could be accomplished within a very
Bradshaw Acquires Laser Source USA
RICHARDSON, Texas --- The Bradshaw Group Inc., an industry leading provider of high quality printers, parts and supplies, announced last Thursday that it has acquired the assets of Laser Source USA Inc. “We are pleased to announce our first acquisition in the desktop parts distribution sector, and the overall expanded capabilities that Laser Source can now offer its customers,” said Monty Milliner, President of Bradshaw. “In today’s economy, service organizations
One Source Appoints Vice President
RALEIGH, N.C. (August 23, 2010)—One Source of NC, LLC (onesource-nc.com), a firm that specializes in the recruitment of architecture, engineering and design talent, announces today that Larry Snyder has joined its Raleigh office as vice president of business development. Snyder’s experience will broaden the firm’s strategic focus to mechanical manufacturing and lifecycle management. Snyder brings more than 25 years of engineering, management and executive sales experience to One Source. He
Source Code Research Accelerated
Software development is mainly copy and modify of existing source code, especially from Open Source projects. New windows tool provides a user interface optimized for search and copy. When analyzing source code, a single search often does not find the best result for a query. The search term must be modified, or a different word is tried - and then the search is repeated. This leads to hundreds of repeated searches
Rewarding Scottish Open Source
The 2008 Scottish Open Source Awards is now open for nominations. As we talk around we are hearing of Open Source initiatives in Scotland that are outside of the seen Open Source community. It would be great to draw some of these projects out into the open, and celebrate the hard work that has gone into them. In 2007, the first year of the Awards, we presented the Scottish
Anouncing Openstream Open Source Webshop
Openstream Open Source Webshop is based on osCommerce Online Merchant v2.2RC2. While everybody is waiting for osCommerce v3.0 Final to be released we decided to set up this site to provide developers with a slightly loaded version of osCommerce. The emphasis is on slightly, because we don't want to add tons of features in order to keep the upgrade process to new 2.2 versions and the final upgrade to v3.0