GB2140971A - Anti-interference condenser - Google Patents

Abstract

The anti-interference condenser (4) comprises an electrically insulating bushing (3) which keeps the condenser terminals (1) and (2) in the form of side plates spaced apart from one another. The bushing is designed to allow the passage of a connecting element (10) of the condenser terminal (1) through the condenser terminal (2), the insulating bushing (3) being preferably formed in one piece with an insulating sleeve (6). <IMAGE>

Description

SPECIFICATION Anti-interference condensor This invention relates to a condenser. It relates more particularly but not exclusively to a built-in antiinterference condenser for alternating current generators, hereinafter referred to as generators, for example a condenser provided to eliminate radio interference and ensure electro-magnetic compati bility.

It is known to use anti-interference condensers for generators with rectifiers which may be mounted, for example, externally.

In these arrangements, the condenser has a supply lead whose inductance diminishes the antiinterference action of the condenser due to resonance phenomena and lowering of the upper limiting frequency. Moreover, the arrangement requires additional connecting elements for the supply lead and a separate insulating bushing for fixing the rectifier in the generator.

It is an object of the present invention to provide an anti-interference condenser, for example for installation in generators, which can be installed without the disadvantages of the state of the art mentioned above.

According to the invention there is provided an anti-interference condenser in which condenser plates or their terminals in the form of side plates are spaced apart by an insulating bushing, which bushing permits the passage of a connecting ele mentor one condenser terminal through a further said condenser terminal.

Further advantageous features of the apparatus according to the invention appear in the following claims 2 to 4. The invention will now be described with reference to Figures 1 to 3.

Figure 1 is a vertical section through an embodiment according to the invention; Figure 2 is a vertical cross-section through the embodiment shown in Figure 1, rotated through 90,C; Figure 3 is a schematic cross-section through an anti-interference condenser according to the invention installed in a generator.

According to Figures 1 and 2, the condenser according to the invention comprises a condenser element 4 which preferably has a polycarbonate dielectric. This condenser is preferably completely covered with a layer of plastics 5, polyamides being particularly suitable forth is purpose.

The condenser element 4 has two terminals in the form of said plates 1,2 on the condenser armature.

The side plates are in the form of strips arranged on opposite sides of a plastics insertion member 3 which may, for example, be rectangular. This invention member 3 is preferably integral with the plastics covering 5 which has been applied by spraying. A passage 6 formed in the insertion member 3 also extends through the side plates 1 and 2 and continues through a tube or bushing 6 on one side of the insertion member 3. An insulating bushing 6 integrated in the interference condenser is thereby formed. The insulating bushing 6 associated with the interference condenser may be used wherever two parts which are at a potential difference to each other are required to be mechanically joined together but electrically separated from each other by an insulating body 7 (see Figure 3).

The condenser terminal 1 is not insulated in the region of the opening to the passage through the insulating bushing 6 and a metal screw 10 passing through the bushing 6 lies with its head in electrical ly conductive contact with the terminal 1. The terminal 2 is similarly not insulated in the region of the bushing 6 and is thus designed for making electric contact in this region. According to Figure 3, in the case of a special generator, this region lies in contact with a cooling body 8 on the positive side while the cooling body 9 on the negative side is connected to the condenser terminal 1 by the screw 10.

The condenser according to this invention is particularly suitable for installation in a generator.

The compact design of the condenser according to the invention, without connecting lead or connecting elements, considerably reduces the outlay in material and assembly time.

Further advantages as regards interference elimination and electromagnetic compatibility are obtained in operation.

1. An anti-interference condenser in which condenser plates or their terminals in the form of side plates are spaced apart by an insulating bushing, which bushing permits the passage of a connecting element for one condenser terminal through a further said condenser terminal.

2. A condenser according to claim 1, in which the terminals in the form of side plates are not insulated on their respective external surfaces in the region of the opening to the passage through the insulating bushing.

3. A condenser according to claim 1 or 2 in which the insulating bushing is formed in one piece with an insertion member having opposite faces to which are applied the condenser armatures or their side plate terminals.

4. A condenser, in which two terminals in the form of side plates are applied to opposite sides of an insertion member which spaces them apart, said insertion member containing a passage which continues into a tubular member of insulating material forming an insulating bushing through which can be passed a screw which lies in conductive contact on one of the terminals, that side of the other condenser terminal which is remote from the insertion member being at least in part designed for electric contact, the condenser being coated, preferably by polyamide, except forth terminals in the region of the insulating bushing.

5. An anti-interference condenser constructed and arranged substantially as described herein with reference to the accompanying drawings.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims (5)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Anti-interference condensor This invention relates to a condenser. It relates more particularly but not exclusively to a built-in antiinterference condenser for alternating current generators, hereinafter referred to as generators, for example a condenser provided to eliminate radio interference and ensure electro-magnetic compati bility. It is known to use anti-interference condensers for generators with rectifiers which may be mounted, for example, externally. In these arrangements, the condenser has a supply lead whose inductance diminishes the antiinterference action of the condenser due to resonance phenomena and lowering of the upper limiting frequency. Moreover, the arrangement requires additional connecting elements for the supply lead and a separate insulating bushing for fixing the rectifier in the generator. It is an object of the present invention to provide an anti-interference condenser, for example for installation in generators, which can be installed without the disadvantages of the state of the art mentioned above. According to the invention there is provided an anti-interference condenser in which condenser plates or their terminals in the form of side plates are spaced apart by an insulating bushing, which bushing permits the passage of a connecting ele mentor one condenser terminal through a further said condenser terminal. Further advantageous features of the apparatus according to the invention appear in the following claims 2 to 4. The invention will now be described with reference to Figures 1 to 3. Figure 1 is a vertical section through an embodiment according to the invention; Figure 2 is a vertical cross-section through the embodiment shown in Figure 1, rotated through 90,C; Figure 3 is a schematic cross-section through an anti-interference condenser according to the invention installed in a generator. According to Figures 1 and 2, the condenser according to the invention comprises a condenser element 4 which preferably has a polycarbonate dielectric. This condenser is preferably completely covered with a layer of plastics 5, polyamides being particularly suitable forth is purpose. The condenser element 4 has two terminals in the form of said plates 1,2 on the condenser armature. The side plates are in the form of strips arranged on opposite sides of a plastics insertion member 3 which may, for example, be rectangular. This invention member 3 is preferably integral with the plastics covering 5 which has been applied by spraying. A passage 6 formed in the insertion member 3 also extends through the side plates 1 and 2 and continues through a tube or bushing 6 on one side of the insertion member 3. An insulating bushing 6 integrated in the interference condenser is thereby formed. The insulating bushing 6 associated with the interference condenser may be used wherever two parts which are at a potential difference to each other are required to be mechanically joined together but electrically separated from each other by an insulating body 7 (see Figure 3). The condenser terminal 1 is not insulated in the region of the opening to the passage through the insulating bushing 6 and a metal screw 10 passing through the bushing 6 lies with its head in electrical ly conductive contact with the terminal 1. The terminal 2 is similarly not insulated in the region of the bushing 6 and is thus designed for making electric contact in this region. According to Figure 3, in the case of a special generator, this region lies in contact with a cooling body 8 on the positive side while the cooling body 9 on the negative side is connected to the condenser terminal 1 by the screw 10. The condenser according to this invention is particularly suitable for installation in a generator. The compact design of the condenser according to the invention, without connecting lead or connecting elements, considerably reduces the outlay in material and assembly time. Further advantages as regards interference elimination and electromagnetic compatibility are obtained in operation. CLAIMS

1. An anti-interference condenser in which condenser plates or their terminals in the form of side plates are spaced apart by an insulating bushing, which bushing permits the passage of a connecting element for one condenser terminal through a further said condenser terminal.

2. A condenser according to claim 1, in which the terminals in the form of side plates are not insulated on their respective external surfaces in the region of the opening to the passage through the insulating bushing.

3. A condenser according to claim 1 or 2 in which the insulating bushing is formed in one piece with an insertion member having opposite faces to which are applied the condenser armatures or their side plate terminals.

4. A condenser, in which two terminals in the form of side plates are applied to opposite sides of an insertion member which spaces them apart, said insertion member containing a passage which continues into a tubular member of insulating material forming an insulating bushing through which can be passed a screw which lies in conductive contact on one of the terminals, that side of the other condenser terminal which is remote from the insertion member being at least in part designed for electric contact, the condenser being coated, preferably by polyamide, except forth terminals in the region of the insulating bushing.

5. An anti-interference condenser constructed and arranged substantially as described herein with reference to the accompanying drawings.