JPS6029337Y2 - Rotary rectifier for brushless generator - Google Patents

Description

[Detailed Description of the Invention] This invention relates to protection of a rotating rectifier of a brushless generator.

Generally, in a brushless generator, a reaction current may be generated in the field winding of the generator due to an abnormal phenomenon in the output system of the generator.

When such a reaction current is generated, a sending voltage is applied to the rotary rectifier, and if this voltage exceeds a certain level, the rectifying element will be punctured.

To prevent this, a high-resistance resistor is connected in parallel with the generator's field winding.

Conventionally, a special place was provided on the rotor of the generator for attaching the resistor, which resulted in a large generator and the disadvantage of requiring more man-hours for assembly.

The present invention solves these conventional drawbacks, and is designed so that the rotary rectifier, the armature winding, and the field winding are installed on the rotating shaft separately and independently, and the rotary rectifier and the field winding are A varistor with non-linear characteristics is used in place of a conventional large-sized resistor with linear characteristics, which is electrically connected to a winding wire and a lead wire.

At that time, we focused on the entire field winding, armature winding 9-turn rectifier, and varistor block, which should originally be on the rotating shaft of a brushless generator. The purpose is to simply and rationally integrate the generator on the rotating shaft while satisfying electrical, thermal and mechanical conditions, thereby reducing the cost and improving the quality of the generator.

The basic structure of the present invention, which is distantly related to this purpose, is that a pair of heat sinks and conductive rings placed opposite each other are used as busbars for the positive and negative electrodes on the DC side, and a varistor block is sandwiched between the pairs of rings. and one end of a rectifying element is attached to the pair of rings to form a bridge rectifying circuit.

Embodiments of the present invention will be described below with reference to the drawings shown in FIGS. 1 to 6.

FIG. 1 is an electrical connection diagram of a brushless generator equipped with a rotary rectifier of the present invention, and this connection is made between the armature winding 5a of the AC exciter 5 and the rectifying element 6, and between the rectifying element 6 and the main generator. The field windings 15 of the machine 7 are connected to each other, and the varistor block 8 is connected so as to be interposed between the positive and negative discharge plates/conducting rings 9, 9a.

Next, the configuration of the rotary rectifier according to the embodiment will be explained with reference to FIGS. 2 to 6. The rotary rectifier 10 is formed on an insulating boss 12 with a convex cross section that is fitted and fixed to a rotating shaft (not shown). There is.

Ring-shaped heat dissipating plates and conductive rings 9, 9a formed in the same shape and size are arranged on both sides of the protruding portion 12c of the insulating boss 12,
Insulators 12a and 12b separate from the insulating boss 12 are applied from the outside of these conductive rings 9 and 9a, and the space between them is fixed using any fixing means.

Further, a cylindrical varistor block 8 is interposed between the conductive rings 9 and 9a that protrude outward from the protruding portion 12c, and is placed at, for example, six locations in the circumferential direction of the conductive ring 9°9a. Equally distributed, these barista blocks 8
is tightened and fixed with a fixing pin 13.

In addition, one end of the anode and cathode of a rectifying element 6 made of a silicon element or the like is directly connected to a heat sink/conductive ring 9, 9a at an intermediate position between adjacent varistor blocks 8, and the other end of these rectifying element 6 is connected directly to a heat sink/conductive ring 9, 9a. The conductive rings 9, 9a are provided so as to protrude to the outside of each of the conductive rings 9, 9a as busbars of a positive electrode and a negative electrode on the DC side.

Therefore, when installing the varistor block 8, one of the positive and negative conductive rings 9, 9a, for example, the conductive ring 9, is installed first, the insulator 12s and the varistor block 8 are attached thereto, and then the other one is installed. Conductive ring 9a
is attached, and the protruding portion 12c of the insulating boss 12, the insulators 12a, 12b1, the conductive rings 9, 9a, and the varistor block 8 are integrally fixed by applying the insulator 12b.

The varistor block 8 is constructed by stacking varistor elements as shown in FIGS. 5 and 6.

For example, as shown in FIG. 5, the varistor element 1 has a through hole 2 in the center and electrodes 3 on both ends.

Such varistor elements 1 are stacked on top of each other and formed into an integral block using a fastening material 4.

By using a varistor block 8 having such characteristics that the voltage applied to both ends of the varistor block 8 is proportional to the 00 division of the flowing current, loss during normal operation is small and operation is reliable during abnormal conditions.

As is clear from the above description, according to the present invention, the varistor block 8 can be attached in one process of assembling the rotary rectifier 10.

Therefore, the only connections are the armature winding 5a of the AC exciter 5, the rectifying element 6, the conductive ring 99a to which the rotary rectifier 6 is attached, and the field winding 15 of the main generator 7, making work easier than before. In addition to this, quality can also be improved because the number of connection points is reduced.

In addition, there is no space for the protective device compared to the conventional method, and by holding the varistor block in the conductive ring, space is secured for its installation, and by using a part of the surface of the conductive ring as a spacer to lift it above the insulating boss, it is possible to attach the varistor block to the conductive ring. A number of effects can be obtained, such as making it easier to install the rectifying element, reducing the axial dimension, making the machine more compact, and making electrical connections easier.

[Brief explanation of the drawing]

Fig. 1 is an electrical connection diagram of a brushless generator, Fig. 2 is a front view of a rotary rectifier showing an embodiment of the present invention, Fig. 3 is a sectional view taken along the line B-0 in Fig. 2, Figure 4 is A-0 in Figure 2.
5 and 6 are perspective views showing the structure of the varistor block. 6: Rectifier element, 8: Varistor block, 9, 9a: Discharge plate and conductive ring, 10: Rotating rectifier, 11: Boss member, 1
2: Insulation boss, 13: Fixing pin.

Claims (1)

[Scope of utility model registration request] A rectifier circuit is provided on the rotating shaft together with the field winding of the generator and the armature winding of the AC exciter, and converts the AC power generated in the armature winding into DC power and supplies it to the field winding. In a rotary rectifier for a brushless generator, in which a rectifying element is attached, an insulating boss is attached to the rotating shaft, and on the insulating boss, the positive and negative busbars on the DC side of the rectifying circuit are formed, and the field winding is arranged. A pair of heat sink plates/conducting rings electrically connected to the heat sink/conducting rings are attached, and the rectifying elements constituting the rectifying circuit are electrically and mechanically coupled to the heat sink/conducting rings. At least one varistor block is disposed between them for protecting the rectifying element, and the varistor block is sandwiched between the heat sink and conductive ring so as to be electrically connected therebetween. A rotary rectifier for brushless generators featuring: