High-stability brushless exciter

Abstract

The high-stability brushless exciter comprises a main body, an alternating-current winding, an iron core, a pressing ring, aluminum seats, fuses, a conductive shaft, a conductive rod and a rotating diode, the alternating-current winding and the iron core are arranged on the main body, the pressing ring is connected with the alternating-current winding and the iron core, the aluminum seats are arranged on the pressing ring, the fuses are arranged on the aluminum seats, the conductive rod is arranged on the conductive shaft, and the rotating diode is arranged on the conductive shaft. According to the brushless exciter, the pressing ring is used as a key component, so that the axial length of the brushless exciter is greatly reduced, the weight of a rotor of the brushless exciter is reduced, and the brushless exciter is more compact in structure, more compact in structure and more compact in structure. As the axial length of the brushless exciter and the weight of the rotor are reduced, the critical speed of rotation of the shaft system is improved, the stability of the shaft system is also improved, and the brushless exciter has certain use value and popularization value.

Description

Technical Field

[0001] The utility model relates to the technical field of brushless exciters, in particular to a high-stability brushless exciter. Background Art

[0002] The brushless excitation system uses a voltage regulator to excite the excitation winding of the AC exciter. The AC power generated by the armature winding of the exciter is rectified by a rotating rectifier and then used to excite the field winding of the main generator. The brushless excitation system has its own irreplaceable advantages and can operate stably under dangerous conditions. It is the preferred excitation method for modern small and medium-sized motors and large brushless excitation systems.

[0003] The shaft end of the brushless excitation generator is an AC generator, and its rotor is the generating winding. The generated current is guided to the silicon rectifier tube fixed on the shaft through the wire fixed on the generator shaft. The rectified DC directly enters the rotor winding. There is no rectifier brush, so it is called brushless excitation. Since the rectifier tube has to be shut down if it breaks, its application is gradually reduced, and the self-excitation system is basically adopted.

[0004] Brushless exciter is the main excitation method of thermal generator. The rotor of AC brushless exciter is generally composed of rectifier disc, iron core punching sheet, pressure ring at both ends, coil and machine shaft. The conventional structure is a separate rectifier disc structure, which leads to a long axial length and heavy weight of the exciter rotor. Especially for the two-point installation type, the critical speed of the shaft system is extremely unstable.

[0005] In summary, a high-stability brushless exciter is needed to solve the deficiencies in the prior art. Utility Model Content

[0006] In view of the deficiencies in the prior art, the utility model provides a high-stability brushless exciter, aiming to solve the above problems.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a high-stability brushless exciter, including a main body, an AC winding, an iron core, a pressure ring, an aluminum seat, a fuse, a conductive shaft, a conductive rod, and a rotating diode. The AC winding and the iron core are both arranged on the main body, the pressure ring is connected to the AC winding and the iron core, a plurality of aluminum seats are arranged on the pressure ring, the fuse is arranged on the aluminum seat, the conductive shaft is arranged in the middle of the main body, the conductive rod is arranged on the conductive shaft, and the rotating diode is arranged on the aluminum seat. By using the pressure ring as a key component, the axial length of the brushless exciter is reduced to a large extent, and the rotor weight of the brushless exciter is also reduced. Since the axial length and rotor weight of the brushless exciter are reduced, the critical speed of the shaft system is increased, and the stability of the shaft system is also improved.

[0008] Furthermore, the pressing ring is provided with a plurality of aluminum seats, and the plurality of aluminum seats are arranged on the pressing ring at equal intervals.

[0009] Furthermore, an insulating gasket is provided between the aluminum seat and the pressure ring.

[0010] Furthermore, the fuse and the rotating diode are both arranged on the aluminum base, and the rotating diode is symmetrically arranged on both sides of the fuse.

[0011] Furthermore, the fuse is connected to the pressure ring through an aluminum seat.

[0012] Furthermore, the high-stability brushless exciter also includes a rectifier circuit module, which includes a diode D1, a diode D2, a diode D3, a diode D4, a diode D5, and a diode D6, a resistor R1, a resistor R2, and a resistor R3. One end of the diode D1, the diode D2, and the diode D3 are all connected to the negative input end of the generator excitation winding, and the other ends of the diode D1, the diode D2, and the diode D3 are also connected to the diode D4, the diode D5, and the diode D6 respectively. The diode D4, the diode D5, and the diode D6 are also connected to the positive output end of the generator excitation winding. One end of the resistor R1 is connected to the diode D1, and the other end of the resistor R1 is connected to the U phase of the exciter armature. One end of the resistor R2 is connected to the diode D2, and the other end of the resistor R2 is connected to the V phase of the exciter armature. One end of the resistor R3 is connected to the diode D3, and the other end of the resistor R3 is connected to the W phase of the exciter armature.

[0013] Beneficial effects of the utility model:

[0014] 1. In the utility model, the pressure ring is used as a key component and plays the role of a rectifier disk. The rotating diode is installed on the enlarged pressure ring, which greatly reduces the axial length of the brushless exciter and also reduces the rotor weight of the brushless exciter. Since the axial length and rotor weight of the brushless exciter are reduced, the critical speed of the shaft system is increased, and the stability of the shaft system is also improved;

[0015] 2. In the utility model, an insulating gasket is provided as a connecting component between the aluminum seat and the pressure ring, which effectively insulates the pressure ring, and the fuse and the rotating diode are both arranged on the aluminum seat, and the rotating diodes are symmetrically arranged on both sides of the fuse. The overall structural design is relatively reasonable and has certain use value and promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 It is a schematic diagram of the main structure of the utility model.

[0018] Figure 2 It is a schematic cross-sectional view of the installation structure of the pressure ring of the utility model.

[0019] Figure 3 It is a schematic side view of the pressing ring structure of the utility model.

[0020] Figure 4 This is a schematic diagram of the rectifier disc circuit principle of the utility model.

[0021] In the figure: 1-main body, 2-AC winding, 3-iron core, 4-pressure ring, 5-aluminum seat, 51-insulating gasket; 6-fuse, 7-conductive shaft, 8-conductive rod, 9-rotating diode. DETAILED DESCRIPTION

[0022] In order to facilitate the understanding of the utility model, the utility model is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on the other element, or there can be one or more centered elements therebetween. When an element is described as "connected to" another element, it can be directly connected to the other element, or there can be one or more centered elements therebetween. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this specification are for illustrative purposes only.

[0023] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used in this specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0024] like Figure 1As shown, a high-stability brushless exciter includes a main body 1, an AC winding 2, an iron core 3, a pressure ring 4, an aluminum seat 5, a fuse 6, a conductive shaft 7, a conductive rod 8, and a rotating diode 9. The AC winding 2 and the iron core 3 are both arranged on the main body 1, the pressure ring 4 is connected to the AC winding 2 and the iron core 3, a plurality of aluminum seats 5 are arranged on the pressure ring 4, the fuse 6 is arranged on the aluminum seat 5, the conductive shaft 7 is arranged in the middle of the main body 1, the conductive rod 8 is arranged on the conductive shaft, and the rotating diode 9 is arranged on the aluminum seat 5.

[0025] A plurality of aluminum seats 5 are arranged on the pressing ring 4 , and the plurality of aluminum seats 5 are arranged on the pressing ring 4 at equal intervals.

[0026] like Figure 2 As shown, an insulating gasket 51 is provided between the aluminum seat 5 and the pressing ring 4 .

[0027] The fuse 6 and the rotating diode 9 are both arranged on the aluminum base 5, and the rotating diode 9 is symmetrically arranged on both sides of the fuse 6. This structural layout improves the space utilization to a certain extent.

[0028] like Figure 3 As shown, the fuse 6 is connected to the pressing ring 4 through the aluminum seat 5.

[0029] As shown in Figure 4, the high-stability brushless exciter also includes a rectifier circuit module, which includes a diode D1, a diode D2, a diode D3, a diode D4, a diode D5, and a diode D6, a resistor R1, a resistor R2, and a resistor R3. One end of the diode D1, the diode D2, and the diode D3 are all connected to the negative input end of the generator excitation winding, and the other ends of the diode D1, the diode D2, and the diode D3 are also connected to the diode D4, the diode D5, and the diode D6 respectively. The diode D4, the diode D5, and the diode D6 are also connected to the positive output end of the generator excitation winding. One end of the resistor R1 is connected to the diode D1, and the other end of the resistor R1 is connected to the U phase of the exciter armature. One end of the resistor R2 is connected to the diode D2, and the other end of the resistor R2 is connected to the V phase of the exciter armature. One end of the resistor R3 is connected to the diode D3, and the other end of the resistor R3 is connected to the W phase of the exciter armature.

[0030] The working principle of the utility model is as follows: the armature winding of the three-phase swing-type AC exciter is connected to the three-phase rectifier disk (pressing ring 4). When the excitation device supplies a certain excitation current to the stator winding of the AC exciter, it will generate a constant magnetic field. The rotating armature of the AC exciter induces a three-phase symmetrical potential and transmits it to the three-phase rectifier bridge. After being rectified by the rotating rectifier (the rotating rectifier is composed of a rotating diode 9, a fuse 6, an aluminum seat 5, an insulating gasket 51 and a pressing ring 4), the AC potential is converted into a DC potential for excitation of the generator rotor excitation winding. The stator winding of the main generator then induces a three-phase symmetrical potential. The change of the generator load will cause the change of the generator terminal voltage, and the terminal voltage is maintained. The constant is achieved by controlling the excitation current supplied to the AC exciter through the excitation device. Through the excitation control system, the excitation current of the AC exciter is changed, causing the armature potential of the AC exciter to change, thereby changing the excitation current of the synchronous generator. The iron core pressing ring 4 at the rear end of the armature core replaces the function of the rectifier disk, and the rectifier components are arranged on it to form a rectifier circuit. Each phase is composed of a fuse 6 to form a protection circuit to prevent the steam turbine generator rotor from losing step (or the stator end is short-circuited) and generating overcurrent in the rotor excitation winding and causing irreversible damage. The fuse and diode are selected as rotary fuses and diodes, and are radially installed on the mounting seat of the pressing ring 4.

[0031] It should be noted that the preferred implementation methods of the utility model are given in the specification and drawings of the utility model. However, the utility model can be implemented in many different forms and is not limited to the implementation methods described in the specification. These implementation methods are not used as additional restrictions on the content of the utility model. The purpose of providing these implementation methods is to make the understanding of the disclosure of the utility model more thorough and comprehensive. In addition, the above-mentioned technical features continue to be combined with each other to form various implementation methods not listed above, which are all regarded as the scope of the description of the utility model; further, for ordinary technicians in this field, they can be improved or transformed according to the above description, and all these improvements and transformations should belong to the scope of protection of the claims attached to the utility model.

Claims

1. A high stability brushless exciter, characterized in that: The invention comprises a main body (1), an AC winding (2), an iron core (3), a pressure ring (4), an aluminum seat (5), a fuse (6), a conductive shaft (7), a conductive rod (8), and a rotating diode (9). The AC winding (2) and the iron core (3) are both arranged on the main body (1); the pressure ring (4) is connected to the AC winding (2) and the iron core (3); a plurality of aluminum seats (5) are arranged on the pressure ring (4); the fuse (6) is arranged on the aluminum seat (5); the conductive shaft (7) is arranged in the middle of the main body (1); the conductive rod (8) is arranged on the conductive shaft; and the rotating diode (9) is arranged on the aluminum seat (5).

2. A high stability brushless exciter according to claim 1, characterized in that: The pressing ring (4) is provided with a plurality of aluminum seats (5), and the plurality of aluminum seats (5) are arranged on the pressing ring (4) at equal intervals.

3. A high stability brushless exciter according to claim 1, characterized in that: An insulating gasket (51) is provided between the aluminum seat (5) and the pressure ring (4).

4. A high stability brushless exciter according to claim 1, characterized in that: The fuse (6) and the rotating diode (9) are both arranged on the aluminum base (5), and the rotating diode (9) is symmetrically arranged on both sides of the fuse (6).

5. The high stability brushless exciter according to claim 1, characterized in that: The fuse (6) is connected to the pressure ring (4) via the aluminum seat (5).

6. A high stability brushless exciter according to claim 1, characterized in that: It also includes a rectifier circuit module, which includes a diode D1, a diode D2, a diode D3, a diode D4, a diode D5, and a diode D6, a resistor R1, a resistor R2, and a resistor R3. One ends of the diode D1, the diode D2, and the diode D3 are all connected to the negative input end of the generator excitation winding, and the other ends of the diode D1, the diode D2, and the diode D3 are also connected to the diode D4, the diode D5, and the diode D6 respectively. The diode D4, the diode D5, and the diode D6 are also connected to the positive output end of the generator excitation winding. One end of the resistor R1 is connected to the diode D1, and the other end of the resistor R1 is connected to the U phase of the exciter armature. One end of the resistor R2 is connected to the diode D2, and the other end of the resistor R2 is connected to the V phase of the exciter armature. One end of the resistor R3 is connected to the diode D3, and the other end of the resistor R3 is connected to the W phase of the exciter armature.

Images