Kendrion Worldwide

Division Automotive

Kendrion Holding

Kendrion N.V. is a public limited liability company incorporated under the laws of the Netherlands, with its registered office in Zeist.

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classic permanent magnet brake

PM Line

Freni a magnete permanente tradizionali

PM Line

La Linea PM comprende freni a magnete permanente nei quali l'effetto frenante è generato da un campo elettromagnetico permanente. Il freno quindi funziona in condizioni di assenza di tensione e svolge le seguenti funzioni: blocco in posizione, posizionamento e arresto di emergenza. La forza frenante viene disattivata dal campo elettrico di contrasto, garantendo in questo modo un alto grado di sicurezza anche in caso di interruzione dell'alimentazione elettrica. I freni a magnete permanente si distinguono per la loro capacità di sollevamento sicuro, esente da coppie residue in qualsiasi posizione, e per la trasmissione della coppia frenante con gioco nullo.

Specifiche & Dati tecnici

Coppie nominali2,2 - 120 Nm
Tensione24 V CC
Classe di protezioneIP 00
Campo di temperature-5° C a +120° C

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Operating principle

The permanent-magnet single-face brake is designed to operate dry. The force generated by a permanent magnetic field is utilised to produce the braking effect. To neutralise the braking action, the magnetic flux of the permanent magnets is cancelled by an alternate electromagnetic field (electromagnetically released system). The zero backlash connection between the armature and flange hub ensures zero backlash transmission of the brake torque to the machine shaft (e.g. motor shaft) and reliable release of the permanent-magnet single-face brake with zero residual torque. Thanks to these features, permanent-magnet single-face brakes are ideal for servo motor applications.

Brake design

The firmly fitted field coil is installed between the outer ring and inner ring of the permanent-magnet single-face brake. The flying leads required to connect the field coil exit on the brake circumference. The permanent magnets installed in axial direction between the outer ring and the flange of the inner ring generate the magnetic field required to produce the braking action. The armature is connected with the flange hub by means of segmental springs and rivet fasteners to establish an axially movable, torsion-proof and friction-free connection. This ensures zero residual torque during horizontal or vertical brake operation. The rated air gap 's' between the armature and outer ring of the permanent-magnet single-face brake is adjusted during brake mounting (e.g. through mounting tolerances). The flange hub is attached to the machine shaft (e.g. motor shaft) in such a way that a torsion-proof and axially fixed connection is achieved. The permanent magnetic field attracts and pulls the armature in frictional contact with the outer ring or inner ring to generate the brake action. When DC voltage is applied to the field coil of the permanent-magnet single-face brake, the alternate electromagnetic field offsets the force exerted on the armature by the permanent magnetic field and the brake is released. Except for the minimal force exerted by the segmental springs, the shaft to be braked is not exposed to any other axial force.