a- Le modèle vous est connu : Aucun problème
b- Création d’un prototype donc incertitude sur certaines données
prendre :
1- Un moteur à vitesse variable
2- Une crémaillère longue qui peut être raccourcie à volonté.
Ces modèles sont en stock, ainsi vous pourrez déterminer en réel :
-Quelle vitesse est à choisir
-Si la poussé est suffis
-La meilleure longueur à adopter
-Si une vitesse variable est intéressante ou non.
ATTENTION : Avec une crémaillère verticale : moteur frein obligatoire.
Toujours aussi inclure le poids de la crémaillère dans la charge à lever.
Surtout ne jamais faire travailler une crémaillère en butée sèche = répercussion désastreuses sur le mécanisme.
Attention aussi aux charges en bout de crémaillère.
Se reporter aux divers tableaux ci-contre.
Commande par moteur 1500tr/mn. 50Hz.
La vitesse réelle diminue avec la charge.
La poussée max. s’entend avec crémaillère horizontale et avec moteur réversible.
MOTEURS MONOPHASÉS 230 V
Ces moteurs sont livrables en IP 20 ou IP 40.
Ils possèdent un plateau de friction qui assure un léger freinage à l’arrêt.
Par contre, il est nécessaire de vaincre ce
couple de friction au démarrage.
Cette friction continue entraîne un échauffement ne permettant pas au moteur de fonctionner
plus de 30 minutes de façon continue
dans le même sens de rotation.
Inertie résiduelle : De 0,5 à 13mm.
Avec MR 60
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