Low-friction Sealing System for E-drives
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w-friction Sealing System for E-drives Eagle Industry’s hybrid surface mechanical seals provide near-to-zero leakage p erformance at low friction levels over a large speed range. This new product family for sealing the electric motor rotor cooling and reduction gears opens the way for the use of highly efficient and high-speed electric drivetrains.
© EKK
FRICTION REDUCTION AT HIGH SPEEDS
Motivated by electric vehicle range expectations of consumers, efficiency requirements and the need to bring affordable, exciting and environmentally friendly electric mobility to the roads of today and tomorrow, electric drivetrains are speeding up. As maximum rotational speeds are increasing, electric motor designers are facing challenges as friction and cooling at rotating elements plays an increasing role at high speed rotations. Additionally the performance related to friction
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losses needs to be stable over a wider speed range. Eagle Industry (EKK) has developed mechanical seals, which can seal the liquid-cooled rotors and adjacent reduction gears without compromises in friction losses, and exceed the traditional speed boundaries. With the application of advanced surface textures, Eagle Industry has managed to overcome the traditional compromise between friction and leakage in dynamic seals. In the following, the design and function of the new seal called GlideX for the use in electric motor cooling and gearboxes is described.
DYNAMIC SEALING IN ELECTRIC MOTORS
The electric drivetrains of current battery electric vehicles typically have a maximum rotation speed between 10,000 and 15,000 rpm. In the higher segment, even rotational speeds up to 18,000 rpm are already in production and the trend is still upward. The motor manufacturers’ motivation is
A U T H OR S
Hiroki Inoue, M. Sc. is Senior Engineer, Seal Engineering Department, at the Eagle Industry Co. Ltd. in Saitama (Japan).
Yoshiaki Takigahira, M. Sc. is Deputy General Manager, Engineering Division, at the Eagle Industry Co. Ltd. in Saitama (Japan).
Ing. Ron Dircks is Manager Business Development and Innovation at the Eagle Simrax B.V. in Kerkrade (Netherlands).
mainly that higher power density can lead to benefits in efficiency, electric range, and packaging. The need for effective cooling of the motor at higher speeds is equally increasing with the speed as iron losses, eddy currents and winding losses are transferred into heat, which needs to be dissipated from its source. After the introduction of fluid
jacket cooling now also active rotor cooling is increasingly used to avoid motor component overheating. This is often realized using a coolant as a cooling medium. This medium needs to be effectively sealed against the motor compartment as coolants can cause permanent damage to the motor com ponents. FIGURE 1 (position A) shows a typical location for the dynamic seal on a rotor-cooled electric motor. Adjacent to the electric motor, the reduction gear is placed which typically needs oil to lubricate and cool the gears. In some motor configurations, t
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