Circuit for speed control for a one-phase or three-phase motor

Details Circuit for speed control for a one-phase or three-phase motor Circuit for speed control for a one-phase or three-phase motor

H - Electricity

02

J

H02J 3/00 (2006.01) G01P 3/00 (2006.01) G01P 3/22 (2006.01) G01P 3/36 (2006.01) G01P 13/02 (2006.01) H02P 23/00 (2006.01)

Patent

CA 2169836

A circuit for controlling the speed of a three-phase motor comprises driving stages (8-16) connected directly to three-phase mains (R, S, T), the passing of mains voltage by the driving stages directly to the motor windings being controlled by a pulse width modulated signal which is generated by a control circuit (18) under control of the actual speed of the motor and which is supplied to the driving stages via circuits for galvanically the control circuit and the driving stages. The galvanic separation is brought about by means of light emitting diode/solar cell components.

Un circuit permettant de réguler la vitesse d'un moteur triphasé comprend des étages d'entraînement (8-16) directement reliés à un réseau triphasé (R, S, T), le passage de la tension de réseau, par les étages d'entraînement, directement jusqu'aux enroulements du moteur étant commandé par un signal à modulation d'impulsions en largeur qui est généré par un circuit de commande (18), régulé par la vitesse réelle du moteur, et qui est transmis aux étages d'entraînement par des circuits permettant la séparation galvanique du circuit de commande et des étages d'entraînement. La séparation galvanique est effectuée par l'intermédiaire de diodes électroluminescentes/d'éléments de pile solaire.

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