FR2486728A1

FR2486728A1 - Monophase asynchronous motor with HF noise suppression - has controlled switch between winding halves so that each acts as suppression coil

Info

Publication number: FR2486728A1
Application number: FR8015491A
Authority: FR
Inventors: Gerard Busson
Original assignee: ELECTRO HYDRAULIQUE SEH
Current assignee: ELECTRO HYDRAULIQUE SEH
Priority date: 1980-07-11
Filing date: 1980-07-11
Publication date: 1982-01-15
Also published as: FR2486728B1

Abstract

The motor has the speed regulated by controlling a switch (4) in series with the main winding (1) so that the current is only allows to flow through the latter for a portion of each cycle. The switch closures engender HF noise signals which are suppressed so that they do not cause mains interference by splitting the main winding (1) into two identical halves (2,3) with the switch (4) inserted bween them, so that each half (2,3) acts as a suppression coil for the HF noise signals. Pref. an auxiliary winding (9) in series with a capacitor (10) is connected in parallel with the main winding (1), which pref also has a parallel anti-interference capacitor (11). The switch (4) may comprise a triac its control circuit comprising a diac (12), a capacitor (14) and a regulating potentiometer (16).

Description

L'invention est relative à un moteur électrique asynchrone,notamment du type monophasé, destiné à être alimenté par un réseau de courant alternatif. The invention relates to an asynchronous electric motor, in particular of the single-phase type, intended to be supplied by an alternating current network.

On sait que pour faire varier la vitesse d'un moteur asynchrone, on peut faire varier la puissance fournie à ce moteur en disposant en série avec le bobinage principal un interrupteur commandé de manière à ne laisser passer le courant dans ce bobinage que pendant une fraction de chaque alternance du courant d'alimentation. La vitesse obtenue est alors fonction de la fraction de chaque alternance pendant laquelle l'interrupteur est fermé. We know that to vary the speed of an asynchronous motor, we can vary the power supplied to this motor by arranging in series with the main winding a controlled switch so as to let the current flow in this winding for only a fraction of each alternation of the supply current. The speed obtained is then a function of the fraction of each half-cycle during which the switch is closed.

Un tel moyen de commande de la vitesse engendre des signaux à hautes fréquences lors de la fermeture de l'interrupteur commandé. Ces signaux sont transmis au réseau et constituent des parasites pour ce dernier. Such a speed control means generates high frequency signals when the controlled switch is closed. These signals are transmitted to the network and constitute parasites for the latter.

L'invention vise à remédier à cet inconvénient. The invention aims to remedy this drawback.

Le moteur selon l'invention est caractérisé en ce que le bobinage comprend deux parties reliées entre elles par l'intermédiaire de l'interrupteur commandé. The motor according to the invention is characterized in that the winding comprises two parts interconnected by means of the controlled switch.

De cette manière, l'interrupteur commandé, générateur de parasites, est séparé de chacune des lignes du réseau d'alimentation par une partie de bobinage constituant une inductance formant un filtre s'opposant au passage des signaux à hautes fréquences. In this way, the controlled switch, generator of parasites, is separated from each of the lines of the supply network by a winding part constituting an inductance forming a filter opposing the passage of high frequency signals.

On décrit ci-après un mode de réalisation de l'invention en relation avec la figure unique qui représente, de façon schématique, le circuit électrique d'un moteur asynchrone monophasé selon l'invention. An embodiment of the invention is described below in relation to the single figure which schematically represents the electrical circuit of a single-phase asynchronous motor according to the invention.

Le moteur représenté sur cette figure comprend un bobinage (ou phase) principal 1 formé de deux parties identiques 2 et 3 séparées par un triac 4 en série avec ces deux demi bobinages,
La borne 5 du demi bobinage 2 qui est opposée à celle reliée au triac 4 est connectée directement à une première ligne 6 d'un réseau d'alimentation en courant alternatif, par exemple à 50 Hz.The motor represented in this figure comprises a main winding (or phase) 1 formed by two identical parts 2 and 3 separated by a triac 4 in series with these two half windings,
The terminal 5 of the half winding 2 which is opposite to that connected to the triac 4 is connected directly to a first line 6 of an alternating current supply network, for example at 50 Hz.

De même ,la borne 7 du demi bobinage 3 qui est opposée à celle connectée au triac 4 est reliée directement à la seconde ligne 8 du réseau d'alimentation. Similarly, the terminal 7 of the half winding 3 which is opposite to that connected to the triac 4 is connected directly to the second line 8 of the supply network.

En parallèle sur le bobinage 1, c'est-à-dire entre les bornes 5 et 7, se trouve un bobinage (ou phase) auxiliaire 9 en série avec un condensateur 10. In parallel on the winding 1, that is to say between the terminals 5 and 7, there is an auxiliary winding (or phase) 9 in series with a capacitor 10.

Le bobinage 9 et le condensateur 10 permettent, de façon en soi connue, le démarrage du moteur asynchrone monophasé.The winding 9 and the capacitor 10 allow, in known manner, the starting of the single-phase asynchronous motor.

Egalement en parallèle sur le bobinage 1 est monté un autre condensateur 11 qui -comme la séparation du bobinage 1 en- deux parties- vise à empêcher la transmission des signaux parasites à hautes fréquences verts le réseau formé des lignes 6 et 8. Also in parallel on the winding 1 is mounted another capacitor 11 which - like the separation of the winding 1 into two parts - aims to prevent the transmission of parasitic signals at high green frequencies the network formed by lines 6 and 8.

Le circuit de commande du triac 4 comprend un diac 12 dont une première borne est reliée à la gachette 13 du triac 4, un condensateur 14 connecté, d'une part, à la seconde borne du diac 12 et, d'autre part, à une première borne 15 du triac, et, enfin, un potentiomètre 16 dont une borne est reliée au point commun au condensateur 14 et au diac 12 et dont le curseur 17 est connecté à la seconde borne 18 du triac 4. The triac 4 control circuit comprises a diac 12, a first terminal of which is connected to the trigger 13 of the triac 4, a capacitor 14 connected, on the one hand, to the second terminal of the diac 12 and, on the other hand, to a first terminal 15 of the triac, and, finally, a potentiometer 16, one terminal of which is connected to the common point of the capacitor 14 and the diac 12 and the cursor 17 of which is connected to the second terminal 18 of the triac 4.

La fraction de chaque alternance pendant laquelle le triac 4 est conducteur est déterminée par le réglage du potentiomètre 16. En d'autres termes, le déplacement du curseur 17 permet de commander la puissance fournie au moteur et donc sa vitesse de rotation. The fraction of each half-cycle during which the triac 4 is conductive is determined by the adjustment of the potentiometer 16. In other words, the movement of the cursor 17 makes it possible to control the power supplied to the motor and therefore its speed of rotation.

L'invention s'applique à tous les moteurs destinés à être alimentés par le réseau : moteurs de pompes de circulation de l'eau dans un circuit de chauffage central, moteurs de ventilateurs, moteurs de machines à laver, etc. The invention applies to all motors intended to be supplied by the network: motors for pumps for circulating water in a central heating circuit, motors for fans, motors for washing machines, etc.

Claims

1. Asynchronous electric motor intended to be supplied by the alternating network comprising, in series with the main winding, an element for controlling the power supply of high frequency signal generator, parasitic for the network, characterized in that the main winding (1) comprises two parts (2, 3) connected to each other by means of the element (4) so that the latter is separated from the lines (6, 8) of the network by means of each winding part.

2. Motor according to claim 1, characterized in that the element comprises a controlled switch (4) so as to be closed during a fraction of each alternation of the network.

3. Motor according to claim 1 or 2, characterized in that the two parts (2, 3) of the winding (1) are identical.

4. Motor. according to any one of claims 1 to 3, characterized in that it is of the single-phase type.

5. Motor according to claim 4, characterized in that it comprises, in parallel on the main winding in two parts, an auxiliary winding (9) in series with a capacitor (10).

6. Motor according to any one of the preceding claims, characterized in that it comprises, in parallel on the main winding, a capacitor (11) of interference suppression.

7. Motor according to claim 2, characterized in that the controlled switch is a triac (4) and the control circuit comprises a diac (12) as well as a capacitor (14) and a potentiometer (16) for adjustment.