Press archive 2013

16 September 2013

Rugged drive motors that work in transmission oil

Modern cars are increasingly equipped with automatic transmissions, which incorporate various clutches, brakes and other actuators controlled by electronics and hydraulic pressure. Conventional transmissions use a pump coupled with the ingoing shaft to generate control pressure.

The in-house test stand has all the equipment required to put the motors through their paces under realistic operating conditions
The in-house test stand has all the equipment required to put the motors through their paces under realistic operating conditions

Consequently, pressure is generated only when the drive motor is running. In start-stop systems and hybrid vehicles in which the engine is often shut off, the required control pressure for the transmission is often lacking, so the first change of gear after starting is somewhat delayed. Electrically powered auxiliary oil pumps can help by reliably providing the required control pressure when the ignition is switched on and keeping it continuously available for start-stop systems and hybrid vehicles.

The pump is driven by an electronically commutated DC motor specifically adapted to the requirements of the application. Motor specialists ebm-papst St. Georgen use a modular base system with various motor diameters and lengths depending on power requirements. The internal rotor motors work reliably, efficiently and maintenance-free for years in the transmission oil, where the temperature can exceed 100 °C. The basic components of the drive are tailored exactly to the transmission's specifications and tested on the in-house test stand (photo). The completed series is then produced in a clean room.

Anja Niessner
Phone: +49 7724 81-1311
anja.niessner@de.ebmpapst.com

ebm-papst St. Georgen GmbH & Co. KG
Germany
Hermann-Papst-Straße 1
78112 St. Georgen