Retaining ring


At a glance

Technical data

Today, electrical energy is almost exclusively produced in rotating dynamos - so-called generators. Most of this energy by far is produced in turbo generators which run at 3,000 revolutions per minute. The rotating magnetic field is generated by windings with alternating polarity, which are caused by DC. The windings protrude from the longitudinal grooves of the rotor at the ball ends and form the winding head that must be secured against the centrifugal force. Retaining rings take over this function. They are the component bearing the greatest load in a turbo generator. In most cases, the retaining rings are shrunk overhung onto  the ball ends of the rotor bodies and secured against rotary  and axial movements. They are secured against rotary and axial movements by a type of bayonet fastening. On the side facing away from the clenches, a supporting ring shrunken into the retaining ring, der die which absorbs the longidtudinal force of the winding heads.

Our retaining rings endure the enormous centrifugal force in generators - which amounts to up to 3,600 rotations per minute. Current material standard is P900 (material number/DIN-Code: 1.3816, ASTM A 289, Class C)

  • high yield strength
  • good cold and hot forming properties
  • low thermal expansion
  • non-magnetisable
  • resistance to stress corrosion cracking 
Type Pre-machined product
Manufacturing process forged


Available usage groups

  • Pressure vessel steels

Heat treatment

  • Stress-relief annealing

Application areas

  • Fossil fuel energy
  • Mechanical engineering and plant construction
  • Nuclear energy

Contact person

Jörg Schulze

Head of Sales of Energietechnik Essen GmbH