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 Post subject: Re: K8026
PostPosted: Mon Feb 18, 2013 3:26 pm 
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Velleman Support
Velleman Support

Joined: Fri Dec 08, 2006 8:07 am
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Sorry, we have no experience with adding an LDR to this circuit.
Anyway, this circuit is not suited to adjust the speed of the motor you describe.


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 Post subject: Re: K8026
PostPosted: Fri Dec 27, 2013 11:24 am 
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Bonjour,

j'aimerais utiliser ce kit pour controler la vitesse d'un moteur asynchrone a balais qui tourne normalement à 3000t/m
et faire varier cette vitesse de 0 à 3000t/m

spec moteur : triphasé 220v 50Hz 370Watts

http://www.focquet.be/sites/default/fil ... -%20B5.pdf

peut il convenir ?

il semble que la meilleure façon de faire varier la vitesse d'un tel moteur est de jouer sur la fréquence

est ce que je ne risque pas de perdre en puissance en diminuant le voltage ?

d'avance merci pour votre réponse

Bien à vous


Nico


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 Post subject: Re: K8026
PostPosted: Fri Dec 27, 2013 4:53 pm 
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Quote:
est ce que je ne risque pas de perdre en puissance en diminuant le voltage


That is true: using a dimmer, a motor slows down because of its power becomes lower and because of the lower power, the mechanical losses become more important causing the motor to slow down. So it is a really bad idea to control a motor by a dimmer. For this kind of motor you indeed need a frequency controller (expensive but working).


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 Post subject: Re: K8026
PostPosted: Wed Feb 08, 2017 10:15 am 
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Bonjour,
J'aimerais utiliser ce kit sur un appareil existant, et notamment utiliser un des potentiomètres déjà présent dans mon montage à la place de celui fourni.
Pourriez-vous m'indiquer les composants à changer et le calcul pour savoir les valeurs si je remplace le potentiomètre ?

Merci de votre aide.


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