A shading coil or shading ring (Also called Frager spire or Frager coil) is a single (or a few) turn of electrical conductor (usually copper or aluminum) located in the face of the magnet assembly or armature of an alternating current solenoid. The alternating current in the energized primary coil induces an alternating current in the shading coil. This induced current creates an auxiliary magnetic flux which is 90 degrees out of phase from the magnetic flux created by the primary coil.
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| - Spire de Frager (fr)
- Shading coil (en)
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| - Une spire de Frager également appelée bague de déphasage (ou shading ring ou encore shading coil en anglais) est un composant du circuit magnétique d'un équipement fonctionnant en courant alternatif (contacteur, moteur asynchrone…). Le circuit magnétique de tels équipements est feuilleté pour limiter les pertes par courant de Foucault. Le rôle de cette spire conductrice (i.e. un anneau, en court-circuit) en alliage cuivreux est de générer un flux magnétique secondaire à partir d’un flux magnétique principal créé par le bobinage inducteur parcouru par un courant alternatif sinusoïdal. (fr)
- A shading coil or shading ring (Also called Frager spire or Frager coil) is a single (or a few) turn of electrical conductor (usually copper or aluminum) located in the face of the magnet assembly or armature of an alternating current solenoid. The alternating current in the energized primary coil induces an alternating current in the shading coil. This induced current creates an auxiliary magnetic flux which is 90 degrees out of phase from the magnetic flux created by the primary coil. (en)
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| name
| - AC MOTORS (en)
- AC MOTORS AND GENERATORS (en)
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| - gov.dod.dimoc.29943 (en)
- gov.dod.dimoc.39947 (en)
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| - Une spire de Frager également appelée bague de déphasage (ou shading ring ou encore shading coil en anglais) est un composant du circuit magnétique d'un équipement fonctionnant en courant alternatif (contacteur, moteur asynchrone…). Le circuit magnétique de tels équipements est feuilleté pour limiter les pertes par courant de Foucault. Le rôle de cette spire conductrice (i.e. un anneau, en court-circuit) en alliage cuivreux est de générer un flux magnétique secondaire à partir d’un flux magnétique principal créé par le bobinage inducteur parcouru par un courant alternatif sinusoïdal. (fr)
- A shading coil or shading ring (Also called Frager spire or Frager coil) is a single (or a few) turn of electrical conductor (usually copper or aluminum) located in the face of the magnet assembly or armature of an alternating current solenoid. The alternating current in the energized primary coil induces an alternating current in the shading coil. This induced current creates an auxiliary magnetic flux which is 90 degrees out of phase from the magnetic flux created by the primary coil. Because of the 90 degree phase difference between the current in the shading coil and the current in the primary coil, the shading coil maintains a magnetic flux and hence a force between the armature and the assembly while the current in the primary coil crosses zero. Without this shading ring, the armature would tend to open each time the main flux goes through zero and create noise, heat and mechanical damages on the magnet faces (e.g. reducing the bouncing of relay or power contacts and the chatter) (en)
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