A device for control of the speed of a series motor

Details A device for control of the speed of a series motor A device for control of the speed of a series motor

H - Electricity

02

P

H02P 25/14 (2006.01)

Patent

CA 2208071

In a device for control of the speed of a series motor (10) powered from an AC source (16, 17), the free end of the rotor winding (13) is connected to one terminal (16) of the power source and the free end of the stator winding (L1, L2) is connected to the other terminal (17) of the power source via a first two-way silicon controlled rectifier (19), and the stator winding (L1, L2) being further provided with a tap (U) connected to the other terminal (17) of the power source via a second two-way silicon controlled rectifier (20). Means (P1, 22, 23; P2, 24, 25) are provided to generate and supply first trigger pulses to the first controlled rectifier (19) and second trigger pulses to the second controlled rectifier (20), the trigger pulse generating means (P1, 22, 23; P2, 24, 25) being adapted to supply the second trigger pulses only when the first controlled rectifier (19) is fully conducting.

Cette invention concerne un dispositif de commande de vitesse d'un moteur série électrique (10) alimenté par une source de courant alternatif (16, 17). L'extrémité libre de l'enroulement du rotor (13) est reliée à une borne (16) de la source d'alimentation, tandis que l'extrémité libre de l'enroulement du stator (L1, L2) est reliée à l'autre borne (17) de la source d'alimentation par l'intermédiaire d'un premier thyristor deux voies (19). L'enroulement du stator (L1, L2) est également doté d'une prise (U) reliée à l'autre borne (17) de la source d'alimentation par l'intermédiaire d'un second thyristor deux voies (20). Un dispositif (P1, 22, 23; P2, 24, 25) permet de générer et d'envoyer une première série d'impulsions de démarrage au premier thyristor (19) et une seconde série d'impulsions de démarrage au second thyristor (20). Ce dispositif générateur d'impulsions de démarrage (P1, 22, 23; P2, 24, 25) est conçu de manière à n'envoyer les secondes impulsions de démarrage que lorsque le premier thyristor (19) assure une conductivité totale.

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