DE2850952A1 - REGULATING DEVICE FOR AN AC GENERATOR FOR CHARGING A COLLECTOR - Google Patents

Description

Henkel, Kern, Feiler Cr Hänzel - patent attorneys

Registered Representatives

before the

European Patent Office

Mitsubishi Denki Kabushiki Kaisha, ~? Α ?? ί ?? _ηη

D-8000 Munich 80

iokio, japan

Tel .: 089 / 982085-87 Telex: 05 29 802 hnkl d

Telegrams: ellipsoid

2 Nov. 4, 1978

FAM-4353

Regulator device for an alternating current generator for charging a collector

description

The invention relates to the construction of a regulator device for regulating the output voltage of an alternating current generator charging a collector to a predetermined value Size for charging the collector and particularly relates to a composite brush holder and housing assembly for a voltage regulator provided in such a regulator device.

When a collector or accumulator by one of an internal combustion engine driven alternating current generator is charged, its output alternating voltage is in general subjected to a full wave rectification and then through a voltage regulator, the one flowing through the field winding Field current interrupts and lets through, regulated to a predetermined size. Previous voltage regulators included one

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Switching transistor for interrupting and passing the field current as well as a control transistor for switching / blocking control of the switching transistor depending on the operation of a Zener diode, which has a predetermined Size of the output voltage of the assigned alternating current generator measures.

Previous voltage regulators of the type described were designed as an integrated thick-film hybrid circuit on a ceramic substrate educated. The substrate with the voltage regulator in the form of the integrated circuit is thereby in a Metal housing used, with a plus, a field and a ground electrode connected to the integrated circuit be that they protrude in different directions from the housing. These electrodes or poles are included soldered to the various terminals on a brush holder made of an electrically insulating synthetic resin, on the underside of the brush holder the metal housing is attached. The terminals soldered to the plus and field poles are then connected to the assigned, Brushes carried by the brush holder connected to the respective slip rings connected to the field coil issue. Brush holder and metal housing are together on an inner surface of a rear bracket for the The alternating current generator is fastened with the help of screws, the holes of the brush holder pass through and the vertical ones to the brush bores also provided in the brush holder.

With the described arrangement of brush holder and metal housing the latter is located on the aforementioned rear bracket, which is located when the AC generator is in operation warmed up. The housing absorbs the heat from the holder, so that the voltage regulator arranged in the housing eventually reached a comparatively high temperature. In addition, since the three poles or electrodes are in different

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which directions extend away from the voltage regulator is for soldering these poles to the associated terminals the brush holder requires a fairly large amount of time. In addition, after casting or other forms of the Brush holder, the shape in question are disassembled or opened in two different directions, because the direction of the brush bores is different from that of the fastening or screw holes deviates. This design can cause the screw holes to break. From this there are the disadvantages that the molded part has little pestability and the component as a whole is expensive and is not very reliable.

The object of the invention is thus to create an improved and expedient regulator device for a voltage regulating circuit, which is exposed to only a small increase in temperature by the use of a fastening for the Device serving bracket for the alternator transferred amount of heat is reduced, even if this holder is heated to a (comparatively) high temperature.

The invention thus aims to provide an improved Regulator device for an alternating current generator charging a collector, consisting of a housing for receiving a voltage regulating circuit and a brush holder for receiving the brushes which are functionally coupled to the generator, these components forming a one-piece structure should be composed and easy to manufacture.

This task is performed in a regulator device for an alternating current generator having a field winding for charging a collector, with a rectifier for rectifying an output AC voltage of the AC generator, a Brush holder to hold a number of brushes that are in

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Sliding contact with associated slip rings stand over which a field current is fed to the field winding, and a voltage regulator with a voltage regulating circuit for regulation of the field current flowing through the field winding for the purpose of regulating the output voltage of the generator and with a Housing mounted on the generator for receiving the voltage regulating circuit, achieved according to the invention in that the brush holder and housing are designed as a one-piece molded part that the brush holder brush bores for receiving each a brush and bores for attaching the housing to the AC generator, these bores the Brush holder enforce in a common direction, and that the housing in the one-piece molded part through a recess or bore is formed which runs in the same direction as the other bores.

In the following, a preferred embodiment of the invention is explained in more detail with reference to the accompanying drawing. It demonstrate:

1 shows a circuit diagram of a previous regulator device for an alternator charging a collector,

FIG. 2 shows a plan view of the previous voltage regulator, FIG. 3 shows a side view of the regulator according to FIG. 2, Fig. 4 shows a section along the line IV-IV in Fig. 2,

5 shows a plan view of a voltage regulator according to an embodiment of the invention,

6 shows a side view of the controller according to FIGS. 5 and

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FIG. 7 shows a section along the line VII-VII in FIG. 5.

Figure 1 illustrates the circuit diagram of a previous regulator device for an alternating current generator for charging a collector or accumulator. The alternating current generator 1 comprises an armature winding 101 in a three-phase star connection on the stator or stator side, a field winding 102 on the rotor or rotor side and a full-wave rectifier bridge circuit 2, which is connected to the armature winding, to the alternating voltage output of the generator 1 to be subjected to a full wave rectification. The generator is installed in a motor vehicle, not shown, where it is driven by its internal combustion engine. The three-phase full wave rectifier bridge circuit 2 comprises three High voltage output terminals 201, 202 and 203, which are a first and supply a second rectified or rectified voltage via the first and third or via the second and third output terminal, where.?the third output terminal 203 is connected to ground.

The field winding 102 of the generator 1 and the output terminals 202, 203 are connected to a voltage regulating circuit 3 which regulates a rectified output voltage of the generator 1 to a predetermined value. The voltage regulator 3 comprises, ^i, more precisely, one about the field winding 102 of the generator 1 connected semiconductor diode 301 for damping surges and an NPN transistor 302, a field current flow serves as a switching element for interrupting and passing through the field winding 102nd The transistor contains a base resistor 303 in its base circuit, and it is connected to another npn transistor 304 for controlling the switching on and off of the transistor 302. The transistor 304 is in turn connected to a Zener diode which is connected to the junction between resistors 306 and 307, the one via the second and third output terminals 202 and 203 of the rectifier bridge circuit

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Form switched voltage divider. The Zener diode 305 taps the output voltage of the generator 1, whereby it is placed in their conductive or switched-through state when the output voltage of the generator 1 is a predetermined Size reached.

The first output terminal 201 of the rectifier bridge circuit 2 is connected to the positive pole of a collector 4, the negative pole of which is connected to ground, and thus to the third output terminal 203 of the rectifier bridge circuit 2 is connected.

The positive pole of the collector 4 is also connected to the second output terminal 202 of the rectifier bridge circuit 2 and thus with the field winding 102 of the generator 1 via a Series connection of a starter switch 5 and a charge indicator lamp 6 connected. The lamp 6 is connected via an excitation resistor 7.

The operation of the device according to FIG. 1 is described below. To start the internal combustion engine, not shown the starter switch 5 is first closed so that the collector 4 has a base current for the transistor 302 via the closed starter switch 5, the parallel connection of indicator lamp 6 and resistor 7 and the base resistor 303 can provide to turn transistor 302 on. As a result, the collector 4 supplies a field current to the field winding 102 of the generator 4 via the components 5, 6 and 7 and the switched on transistor 302, so that a magnetomotive field force is generated. At the same time, there is a potential difference across the excitation resistance to light up the charge indicator lamp 6 indicated by the becomes that the collector 4 is not charged.

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In this state, the internal combustion engine is started so that it drives the generator 1. The generator 1 induces an output alternating voltage at its armature winding 101 as a function of its speed. This induced it AC voltage is generated by the three-phase full-wave rectifier bridge circuit 2 subjected to a full wave rectification. When the rectified output voltage of the rectifier bridge circuit 2 does not exceed a predetermined value, the potential remains at the branch of the resistors 306 and 307 so low that the Zener diode 305 is kept in the non-conductive or blocking state. The output voltage of the generator 1 then increases with increasing speed at.

The speed of the generator 1 then increases further until its output voltage reaches the predetermined level or exceeds. At this point the potential at the junction of resistors 306 and 307 is so high that the zener diode 305 turns on. In this state, the Zener diode 305 allows a base current through the transistor 304 flow through which this is switched through. Due to the turning on of the transistor 304, the transistor comes on 302 in the blocking state, whereby the current flow through the field winding 102 of the generator 1 is interrupted, so that its output voltage decreases. When this output voltage falls below the predetermined size, the Zener diode 305 is put back into the blocking state, so that the Transistor 304 blocks and, as a result, transistor 302 turns on again, so that field winding 102 of the generator 1 is re-energized and thus the output voltage of the generator 1 increases again.

The process described is repeated continuously, so that the output voltage of the generator 1 · decreases to the predetermined level is regulated. This regulated voltage becomes a full wave rectification and then applied to the collector 4 to charge it to a predetermined voltage.

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On the other hand, one between the second and third output terminal 202 or 203 reaches the rectifier bridge circuit 2 appearing rectified or rectified voltage is a value that practically corresponds to the voltage at the collector 4. At this point, the potential difference across the resistor 7 decreases, so that the charge indicator lamp 6 is de-energized will. This indicates that the collector 4 is charging.

The solid-state voltage regulating circuit 3 described is an integrated thick-film hybrid circuit on one Ceramic substrate formed; it comprises one connected to the junction between diode 301 and base resistor 30 Plus electrode 308, a field electrode 309 connected to the junction between diode 301 and transistor 302 and a ground electrode 310 connected to the ground side of the controller 3 for reasons still to be explained.

The voltage regulating circuit 3 was previously housed, for example, in a structure of the type shown in FIGS. 2, 3 and 4, the plus and field electrodes being functionally connected to the field winding 102 of the generator 1 via the relevant brushes are. As best seen in Fig. 4, a flanged metal housing 311 is at the bottom Ceramic substrate 312 attached using silicone rubber adhesive 313. On the exposed, from the bottom of the case 311 facing away from the top of the substrate 312 is a integrated thick-film hybrid circuit (not shown) is provided, which the voltage regulating circuit 3 according to FIG forms. A suitable, elastic casting resin 314 is then applied to the top of the substrate while filling the housing 312 314 is cast and cured in the housing, whereupon the voltage regulator 3 is completed. For example, can a suitable silicone resin is poured into the housing 311 and placed in a monetary state over substrate 312 and

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then cured. In its gel state, the silicone resin can be referred to as "silicone gel". The finished one Voltage regulator 3 has three electrodes or poles 308, 309 and 310, which are cured in different directions from the Silicone casting resin protrude, although only the positive pole 308 is shown in FIG. 4.

Furthermore, a brush holder 10 with two a rectangular cross-section is made of a thermoplastic or thermosetting resin own bores, which extend centrally over its width and lie one above the other in a vertical direction, as well as two circular or cylindrical bores, which the brush holder at both of its end sections (flanges) enforce perpendicular and perpendicular to the rectangular holes, shaped. In the rectangular or square holes a brush 12 with a complementary cross-section is partially inserted in each case, the brushes with one end protrude from the associated hole. The one or outer end of each brush 12 is used to make a good one Contact with a not shown, directly with the corresponding end of the field winding 202 of the alternating current generator 1 connected slip ring (concave) curved and chamfered accordingly. The other end of each brush 12 is connected within the associated bore with a connecting line or stranded wire 13.

The connecting lines 13 are drawn through coil springs 14 provided within the respective brush bores and by soldering or otherwise electrically connected to a positive pole 15 or a field pole 16, which according to FIG. on the top of the brush holder 10 on opposite sides of the aligned brush bores are arranged. More precisely: the positive pole 15, which partially closes the lower bore according to FIG. 3, is connected to the connecting line 14 emerging from this bore is soldered,

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while the field pole 16 partially closes the upper bore and on the connecting line emerging from this bore 14 is soldered on. A ground pole 17 is on the side of the brush holder facing away from the poles or terminals 15 and 16 11 attached.

The brush holder 10 is then on the flange of the voltage regulator 3 containing housing 311 attached, with plus, field and ground electrodes 308, 309 and 310 through holes pulled through in connecting lugs of poles 15, 16 and 17 respectively and are soldered to these poles, whereupon the brush holder 10 and voltage regulator 3 are assembled to form a unitary structure are.

The assembly so produced is on the inner surface of a Rear bracket 18 attached for the alternating current generator, with a flange or collar provided sleeve

19 made of electrically insulating material in the two circular bores of the brush holder 10 and one with it aligned hole in the associated pole 15 or 16 used will. Then a screw 20 is inserted into the associated sleeve 19 and screwed into the holder 18, wherein A washer 21 and a spring washer 12 are arranged between the screw head and the bushing 19. The screws

20 are electrically isolated from the respective poles or terminals 15 and 16 by the sleeves 19.

In the construction according to FIGS. 2 to 4, the metal housing has 311 high thermal conductivity; in addition, the Temperature of the holder 18 when the alternating current generator is in operation at. As a result, the housing 311 dissipates the heat from the holder 18, so that the temperature in the housing provided voltage regulator 3 increases. In addition, the housing 311 for the voltage regulator 3 and the brush holder 10 can be made separately. The plus, field and ground electrodes 308, 309,

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in different directions and not in one line in a common direction. As a result, so far was for soldering these electrodes at the associated terminals take a lot of time necessary. In addition, since the brush bores of the brush holder 10 extend in a different direction than the Holes for the fastening screws 20, had to be the shape used for molding or casting the brush holder in be dismantled or opened in two different directions, breakage of the screw holes could occur. The brush holder and the mold used to make it consequently had to be manufactured with certain tolerances up to now. This requirement resulted in a reduction the strength of the molded parts and the fact that the product as a whole is expensive and not very reliable.

To avoid the disadvantages of the previous device described With the invention according to FIGS. 5 to 7, a unitary or one-piece brush holder and regulator housing block created. In the illustrated embodiment, a one-piece molded brush holder and regulator housing part is used 23 made of the same synthetic resin as the brush holder according to FIGS. 2 to 4, but with the recesses or bores 23a for the brushes 12, the bores 23c for the fastening screws 20 and another recess or bore 23b in the molded part 23 each run in the same direction. The hole 23b is used to receive the Voltage regulator 13 in the form of an integrated thick-film hybrid circuit .

In particular, the two end sections (flanges) of the molded part 23 are penetrated by circular bores 23c, while one of the similar holes 23a with rectangular cross-section through the central part of the molded part. The other hole 23a and the hole 23b are located are on opposite sides and adjacent to said hole 23a so that it is perpendicular to one through the center points

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of the bores 23c extending line are practically aligned with one another. For this purpose, the molded part 23 a first sprue with a rectangular cross-section defining the bore 23b and one on the opposite one Side located, the second hole 23a defining the sprue (see. Fig. 5). According to Fig. 5 is the bore 23b wider than the bores 23a, and it has an open end, which by the FIG. 6 on the adjacent surface of the molded part 23 protruding portion of the first sprue is determined. According to FIG. 7, however, is the other The end of the bore 23b just before the opposite surface of the molded part 23 is closed. The first sprue thus fulfills the function of the housing 311 according to FIGS. 2 to 4.

The ceramic substrate 312 carries the on its one surface voltage regulating circuit 3 described, and it is perpendicular to its plane of plus, field and ground electrodes 308, 309 and 310, respectively, which are soldered to an electrode area on the edge of the circuit 3. The in predetermined Spaced electrodes lie along this edge of the substrate 312 on a common line. The other surface of the substrate 312 is at the bottom of a U-shaped heat sink 315 by means of a silicone rubber adhesive 313 attached. The bottom of the heat sink 315 extends practically over the extension of the substrate 312, whereby it according to FIG. 7 in a suitable manner with respect to the electrodes 308-310 is electrically isolated.

This is how the main part or body of the voltage regulator is completed.

In this arrangement, the brushes 12 are then in the manner described in connection with FIGS. 2 to 4 in the associated Bores 23a used in the molded part 23, whereupon the connecting lines or strands 13 after they have passed through the

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Coil springs 14 have been pulled through, on plus and field pole 15 and 16, respectively, which are soldered to the surface of the molded part are attached to which the bores 23a-23c open. As best seen in Fig. 5, is the positive pole 15 in the middle part of the top of the molded part 23 fixed so that it partially closes the upper end of the bore 23a. The field pole 16 is on the right part of the Molding top attached so that it partially closes the outer bore 23a and with its screw hole the right screw hole 23c is aligned. Likewise, the ground pole 17 is to the left of the positive pole 15 on the top of the molded part 23 mounted so that its screw hole is aligned with the left hole 23c. The clamps or poles point continue to be bent connecting lugs, which are still closed for explanatory reasons are arranged in a row at predetermined distances from one another and next to the bore 23b.

Thereafter, the main part of the voltage regulator 3 is inserted into the recess or bore 23b in the molded part 23, wherein the three electrodes 308, 309 and 310 over the clamps or poles 15, 16 and 17, respectively, point towards the adjacent bore 23a. The free end sections of the electrodes engage in recesses (FIG. 6) at the ends of the bent ends the connecting lugs (see FIGS. 5 and 6). The electrodes 308-310 can therefore easily be soldered to the associated terminals or poles 15, 16 and 17, respectively.

A casting resin 314 of the type described above is then applied Poured into the bore 23b of the molded part 23 around the ceramic substrate 312 and cured. According to FIG. 7 achieved the casting resin 314 is the upper edge of the first sprue.

In this way, the brush holder and the voltage regulator 3 are assembled into an integral structure, which then in the manner described in connection with FIGS. 2-4

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on the inner surface of the rear bracket 18 of the alternator is attached, only with the difference that on the side of the ground pole 17 the (insulating) sleeve 19 is omitted.

The invention offers several advantages. For example, a temperature rise in the main part of the voltage regulator 3 due to the generator bracket heating up during operation with an increase in de. ' Prevents reliability of the device, because the main part or body of the voltage regulator through the resin molding 23 opposite to the bracket thermally is isolated. In addition, according to the invention, the manufacturing output is increased because the control device for an alternating current generator for charging a collector can be produced easily and cost-effectively and it is not necessary here is to manufacture the brush holder 1t and the regulator housing 311 (Figs. 2 to 4) separately. There are also the brush holes 23a, the regulator bore 23b and the screw bores 23c in the molded part 23 can run in the same direction the mold used for production can be opened in a single direction after the casting or molding process. Through this the risk of breakage at the screw bores 23c when the mold is opened is avoided. Furthermore, it is for the Soldering the electrodes 308-310 to the terminals or poles 15-17 is less time-consuming.

Although the invention is shown and described above in a presently preferred embodiment, are the Of course, various changes and modifications are possible without departing from the scope and basic ideas of the person skilled in the art Invention is deviated.

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L e r e ite

Claims (3)

Henkel, Kern, Feiler & Kanzel Patentanwälte Registered Representatives before the European Patent Office Mitsubishi Denki Kabushiki Kaisha, Möh1straße37,. D-8000 Munich 80 • Tokyo, Japan - Tel .: 0 89/98 20 85-87 Telex: 05 29 802 hnkl d telegrams; ellipsoid 2: ϊ. ? ii> 13? 8 FAM-4353 Regulator device for an AC generator for charging a collector Claims 1.) Regulator device for a field winding having AC generator for charging a collector, with a rectifier for rectifying an output AC voltage of the alternating current generator, a brush holder for holding a number of brushes, the are in sliding contact with assigned slip rings, via which a field current is fed to the field winding, and a voltage regulator having a voltage regulating circuit for regulating the amount flowing through the field winding Field current for the purpose of regulating the output voltage of the generator and with a housing mounted on the generator for accommodating the voltage regulating circuit, characterized in that the brush holder and housing are made in one piece Molded part (23) are designed that the brush's sake brush bores (23a) for receiving a brush (12) and holes (23c) for attaching the housing Original on the alternating current generator (1), these bores the brush holder in a common direction enforce, and that the housing is formed in the one-piece molded part (23) by a recess or bore (23b) which runs in the same direction as the other bores (23a, 23c). 2. Apparatus according to claim 1, characterized in that the voltage regulating circuit as an integrated thick-film hybrid circuit is formed on a surface of a ceramic substrate, which in turn is so in the housing recess or -bore (23b) is arranged that its other surface faces a bottom of the housing is, and that this hole is filled with an elastic, hardened casting resin. 3. Apparatus according to claim 1, characterized in that the brush holder and housing are made as a one-piece structure a (synthetic) resin material. 90 9 822/0768