CN210405006U - Three-stage brushless AC synchronous generator and rotary rectifier - Google Patents

Abstract

The utility model relates to a three-level brushless AC synchronous generator, and a rotary rectifier, the rotary rectifier comprises a positive plate and a negative plate, the positive plate and the negative plate are two hollow discs with the same structure, three diode mounting holes are evenly distributed on the positive plate and the negative plate, six hollow rivet mounting holes I are evenly distributed on the positive plate and the negative plate, a diode is respectively arranged in each diode mounting hole, the cathode of each diode is electrically connected with the positive plate, the anode end of the other three diodes is electrically connected with the negative plate, and each diode is an avalanche type or Zener type diode; three V-shaped notches are uniformly distributed on the peripheries of the positive plate and the negative plate, and the V-shaped notches correspond to the diode mounting holes of the corresponding plates one by one; the three bus bar components are uniformly distributed at the upper end of the reverse side of the positive plate, so that the ventilation and heat dissipation performance is good, the size is small, and the weight is light; the absorption of magnetic field energy and the suppression effect of the voltage spike of the excitation system are very quick and effective.

Description

Three-stage brushless AC synchronous generator and rotary rectifier

Technical Field

The utility model relates to a brushless synchronous alternator makes the field, concretely relates to brushless synchronous alternator of tertiary formula, and rotating rectifier.

Background

In the field of aviation power supply and industrial power generation, in the prior art, a synchronous alternating-current generator adopts a three-level structure for realizing brushless operation. The generator can be divided into a main generator stage, a rotary armature type excitation generator, a rotary rectifier stage and a permanent magnet generator stage, and the generators with the structures of all stages are composed of an armature part and an excitation part.

In order to satisfy the function of the three-level brushless AC synchronous generator, the rotating rectifier has the following requirements:

1. the rotating rectifier can rotate at a high speed along with the excitation part of the three-stage brushless alternating current synchronous generator and can bear the acceleration of thousands of G and the centrifugal force generated in the high-speed running process.

2. When the rotary rectifier runs at high speed, the speed of air circulation is increased to improve the heat dissipation capacity of the rotary rectifier, so the volume of the rotary rectifier cannot be too large.

3. The rotating rectifier needs to convert the alternating current generated by the rotating armature type excitation generator into the direct current excited by the main generator.

4. The rotating rectifier also needs to have the function of absorbing transient energy of the magnetic field when the load of the motor is suddenly added or removed so as to avoid overvoltage between excitation windings of the main generator and reduce power supply peaks of a power supply system, and meanwhile, the rotating rectifier also needs to have the capability of inhibiting or absorbing overvoltage generated by a negative-sequence magnetic field on the excitation windings of the main generator.

The existing rotating rectifier adopts a rectifying circuit of the rotating rectifier formed by connecting a common silicon rectifying diode in parallel with a protective resistor or a capacitor, wherein the common silicon rectifying diode converts alternating current into direct current, and the protective resistor or the capacitor connected in parallel can absorb overvoltage generated by sudden addition and sudden removal of a motor.

When the device is used, the rotary rectifier and the generator coaxially operate, and the protective resistor or the capacitor is electrically connected in a welding mode such as tin welding, contact resistance welding, ultrasonic welding and the like; the mechanical fixation is realized through connecting modes such as clips, clamps, fixing frames and the like; the circuit structure has numerous electrical connection points, a complex physical structure and a complex fixing mode, and the potential hazard of failure caused by centrifugal force in the rotating process of the protective resistor or capacitor is also existed, so that the overall reliability of the rotating rectifier is low, and the reliability of the whole three-stage brushless alternating current synchronous generator is further influenced; due to the existence of the protective resistor, even in a normal working state, the protective resistor can also generate energy consumption to cause the heating and the efficiency reduction of the motor; when the load suddenly changes, the protection resistor absorbs reverse voltage slowly, so that relatively high inter-turn voltage exists in the excitation winding of the main motor, and relatively high surge exists in the output voltage of the main motor.

Meanwhile, the existing rotary rectifier structure still has the following problems:

a) the existing rotating rectifier is mostly of a semi-annular structure, components are not uniformly distributed, centrifugal force is not uniform in the rotating process, the rectifier is easy to deviate to one side, and the service life of the rectifier is influenced;

b) the existing rotary rectifier has more resistance and capacitance elements, so that the fixing mode of the rectifier is complicated, the structure is complex, the size is large, and the heat dissipation performance is poor;

c) the semi-annular structure of the rotary rectifier causes that the positive and negative plates are not on the same plane, the height of the plane is different, the length of the diode pins is different, and the longer diode pins can be deformed under the action of centrifugal force when the rotary rectifier rotates at high speed, so that the reliability of the diode and the rotary rectifier is reduced.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art and provide a three-stage brushless AC synchronous generator and a rotating rectifier, which have good ventilation and heat dissipation, small volume and light weight; the absorption of magnetic field energy and the suppression effect of the voltage spike of the excitation system are very quick and effective.

The utility model provides a technical scheme that its technical problem adopted is:

a rotary rectifier comprises a positive plate and a negative plate, wherein the positive plate and the negative plate are two hollow discs with the same structure, three diode mounting holes are uniformly distributed on the positive plate and the negative plate, six hollow rivet mounting holes I are further uniformly distributed on the positive plate and the negative plate, a diode is respectively mounted in each diode mounting hole, the cathodes of the three diodes are electrically connected with the positive plate, the anode ends of the other three diodes are electrically connected with the negative plate, three V-shaped notches are uniformly distributed on the peripheries of the positive plate and the negative plate, and the V-shaped notches are in one-to-one correspondence with the diode mounting holes of the corresponding plates; each diode is an avalanche type or Zener type diode;

the positive faces of the positive plate and the negative plate are oppositely arranged and fixed in a 60-degree staggered mode through six hollow rivets provided with insulating films on the outer portions, three diode mounting holes of the positive plate and three diode mounting holes of the negative plate are arranged in a staggered mode, and six hollow rivets and six diodes are arranged in a staggered mode;

the bus bar component comprises an arc-shaped bus bar support and a bus bar fixedly connected with one end of the bus bar support, two ends of the bus bar support are respectively provided with a hollow rivet mounting hole II matched with a hollow rivet, two ends of the bus bar are respectively connected to a diode anode end arranged on the positive plate and a diode cathode end arranged on the negative plate, the bus bar support and the bus bar are respectively provided with an exciter excitation winding wire through hole in corresponding positions, three exciter excitation winding wires respectively sequentially penetrate through the corresponding bus bar support along the reverse side of the negative plate, and the exciter excitation winding wire through holes on the bus bar are electrically connected with an exciter A phase voltage, an exciter B phase voltage and an exciter C phase voltage of the exciter.

In the above-mentioned rotary rectifier, the three diode mounting holes of the positive plate and the negative plate are located on a circumference of a concentric circle concentric with the positive plate and the negative plate; six hollow rivet mounting holes on the positive plate and the negative plate are positioned on the circumference of a concentric circle concentric with the positive plate and the negative plate; the distance between the diode mounting hole and the center of the corresponding positive plate and negative plate is smaller than the distance between the hollow rivet mounting hole I and the center of the corresponding positive plate and negative plate.

In the above-mentioned rotary rectifier, each of the diode mounting holes and each of the blind rivet mounting holes are cylindrical, one end surface of each of the diode mounting holes and each of the blind rivet mounting holes is flush with the reverse surface of the corresponding positive plate and negative plate, and the other end surface of each of the diode mounting holes and each of the blind rivet mounting holes extends out of the front surface of the corresponding positive plate and negative plate; the height of the diode mounting hole is matched with that of the diode tube seat, the height of the diode mounting hole is H1, the height of the hollow rivet mounting hole is H2, and the height H2 of the hollow rivet mounting hole is smaller than the height H1 of the diode mounting hole.

In the above-mentioned rotary rectifier, the positive plate and the negative plate are respectively provided with a pole plate rivet mounting hole, and a pole plate rivet for fixing the excitation wire of the main rotor is respectively mounted in the pole plate rivet mounting holes.

In the above-mentioned rotating rectifier, the pole plate rivet is a hollow copper tube with silver plated on the outside, and the inside diameter of the pole plate rivet matches with the excitation wire of the main rotor.

In the above-mentioned rotating rectifier, the bus bar is provided with a hollow rivet mounting hole three corresponding to the hollow rivet mounting hole two on the bus bar bracket; an insulating baffle is integrally formed on the bus bar support.

In the above-mentioned rotary rectifier, the hollow rivet is further provided with an insulating gasket, and the insulating gasket is located between the positive plate and the negative plate.

In the rotary rectifier, the positive surfaces of the positive plate and the negative plate are uniformly provided with arc-shaped bosses, the cross sections of the bosses are T-shaped structural reinforcing ribs, and the three reinforcing ribs and the three V-shaped notches are distributed in a staggered manner.

In the above-mentioned rotating rectifier, the diode includes a tube seat and a pin connected to the tube seat, the tube seat includes a metal casing section located at the lower part and an epoxy resin sealing layer connected to the upper end of the metal casing section, the diameter of the metal casing is greater than that of the epoxy resin sealing layer, and the height of the tube seat is H3; and epoxy resin is injected into the gap between the diode and the diode mounting hole.

A three-stage brushless alternating current synchronous generator comprises a generator rotor, a generator stator, a permanent magnet generator excitation part, a permanent magnet generator armature part, an exciter excitation part, a main generator armature part, a controller and a rotary rectifier in any one of the technical schemes.

The utility model has the advantages that: compared with the prior art utility model:

a) the components such as resistors, capacitors and the like in the rectifier in the prior art are structurally reduced, so that the connection mode is simplified, and the reliability is improved; the diodes are uniformly distributed on the circumference, so that the centrifugal force is uniformly distributed and mutually counteracted; the ventilation and heat dissipation performance is good, the volume is small, and the weight is light;

b) the rotating rectifier adopts an avalanche type or Zener type diode, the reverse voltage of the avalanche type or Zener type diode can be quickly broken down after exceeding a certain threshold value and quickly recovered after the reverse voltage is reduced to be below the threshold value, so that the effects of absorbing magnetic field energy and restraining the voltage spike of an excitation system are very quick and effective; and the extremely low leakage current under the normal working condition improves the efficiency of the motor and reduces the heat generation of the motor.

Drawings

Fig. 1 is an exploded view of the rotary rectifier of the present invention;

fig. 2 is a front view of the rotary rectifier of the present invention;

fig. 3 is a rear view of the rotary rectifier of the present invention;

fig. 4 is a side view of the rotary rectifier of the present invention;

FIG. 5 is a front view of the plate of the rotary rectifier of the present invention;

FIG. 6 is a side view of the plate of the rotating rectifier of the present invention;

fig. 7 is a rear view of the rotary rectifier plate of the present invention;

fig. 8 is an isometric view of a rotating rectifier plate according to the present invention;

fig. 9 is a front view of a diode of the rotating rectifier of the present invention;

fig. 10 is a front view of the positive plate of the rotating rectifier and the diode of the present invention;

fig. 11 is a front left side view of the positive plate and the diode of the rotary rectifier of the present invention;

fig. 12 is a front view of the negative plate and diode assembly of the rotary rectifier of the present invention;

fig. 13 is a left side view of the negative plate and the negative diode assembly of the rotary rectifier of the present invention;

fig. 14 is an isometric view of a rotating rectifier bus bar component according to the present invention;

fig. 15 is an isometric view of a rotating rectifier bus bar support of the present invention;

fig. 16 is an isometric view of a rotating rectifier bus bar according to the present invention;

fig. 17 is a schematic diagram of a rotary rectifier circuit according to the present invention;

fig. 18 is a structural diagram of a three-stage brushless ac synchronous generator according to the present invention;

in the figure, 1, a three-stage brushless alternating current synchronous generator, 2, a controller, 3, a generator rotor, 4, a generator stator, 5, a permanent magnet generator excitation part, 6, a permanent magnet generator armature part, 7, an exciter armature part, 8, an exciter excitation part, 9, a rotating rectifier, 10, a main generator excitation part, 11, a main generator armature part, 12 and a current transformer;

901. an exciter phase A voltage, 902, and an exciter phase B voltage; 903. the exciter C-phase voltage, 904, the positive plate, 905, 906, a bus bar support, 907, a bus bar, 908, a hollow rivet, 909, diodes ZD1, 910, diodes ZD2, 911, diodes ZD3, 912, diodes ZD4, 913, diodes ZD5, 914, diodes ZD6, 915, an insulating gasket, 916, a positive plate rivet mounting hole, 917, a negative plate rivet mounting hole, 918, a positive plate rivet, 919, a negative plate rivet, 920, a reinforcing rib, 921, an exciter winding wire, 922, an insulating film, 923 and a bus bar component.

Detailed Description

In the figure, the rotary rectifier comprises a negative plate 905, a negative plate rivet 919, a diode (ZD 4) 912, a diode (ZD 5) 913, a diode (ZD 6) 914, six insulating gaskets 915, a positive plate 904, a positive plate rivet 918, a diode (ZD 1) 909, a diode (ZD 2) 910, a diode (ZD 3) 911, three bus bar supports 906, three bus bars 907 and six hollow rivets 908 from left to right;

further, diode (ZD 4) 912, diode (ZD 5) 913, diode (ZD 6) 914, diode (ZD 1) 909, diode (ZD 2) 910, and diode (ZD 3) 911 are of an avalanche type or a zener type.

In fig. 2, 3 and 4, six hollow rivets 908 fix the positive plate 904, the negative plate 905, six insulating spacers 915, three bus bar supports 906 and three bus bars 907 into a whole when the rotary rectifier is assembled; the outer surface of the hollow rivet 908 is provided with a layer of insulating film 922; the diode (ZD 1) 909, the diode (ZD 2) 910 and the diode (ZD 3) 911 are arranged on the positive plate; the diode (ZD 4) 912, the diode (ZD 5) 913, and the diode (ZD 6) 914 are mounted on the negative electrode plate.

In fig. 5, 6, 7, and 8, the positive electrode plate 904 and the negative electrode plate 905 have the same material and shape.

The aluminum alloy material is selected during design, and the material has the advantage of light weight while ensuring better strength.

The hollow disc structure adopted by the positive plate 904 and the negative plate 905 in the design has good ventilation and heat dissipation when the rotary rectifier runs at high speed, so the volume of the rotary rectifier can be very small.

Three V-shaped grooves which are uniformly distributed are arranged on the peripheries of the positive plate 904 and the negative plate 905, diode mounting holes are arranged corresponding to the V-shaped grooves one by one, and the three diode mounting holes are positioned on the circumference of a circle which is concentric with the positive plate 904 and the negative plate 905;

two first hollow rivet mounting holes which are symmetrically distributed are arranged adjacent to each diode mounting hole, and one of the six first hollow rivet mounting holes is concentric with the positive plate 904 and the negative plate 905;

the distance between the diode mounting hole and the centers of the positive plate 904 and the negative plate 905 is smaller than the distance between the hollow rivet mounting hole I and the centers of the positive plate 904 and the negative plate 905;

the diode mounting holes and the hollow rivet mounting holes I are arranged in a mode that each diode and two adjacent hollow rivets 908 are in a V-shaped structure when the diode is mounted, and when the high-speed rotating diode of the rotating rectifier moves outwards under the action of centrifugal force, the diode needs to break loose and separate two adjacent V-shaped rivet fixing forces to generate displacement; compared with the annular arrangement of elements in a common rotary rectifier, the structure can better offset the deformation caused by centrifugal force, increase the fastening force of the diode, ensure the firmness of the diode and improve the reliability of the rotary rectifier;

an arc-shaped boss is arranged in the first hollow rivet mounting hole in the front of the positive plate 904 and the negative plate 905, the boss is a reinforcing rib 920 with a T-shaped section, and the rib is designed to increase the strength of the plate, increase the contact area with air and enhance the heat dissipation capacity;

the back surface of the pole plate is flat in surface design, the front surface of the pole plate is uneven due to the fact that the diode mounting holes and the hollow rivet mounting holes are uniformly distributed in a step mode, the height of each diode mounting hole is H1, and the height of each hollow rivet mounting hole is H2; the height H2 of the hollow rivet mounting hole is less than one half of the height H1 of the diode mounting hole, and the design of the height difference can ensure that the front surfaces of the positive plate 904 and the negative plate 905 are arranged in a staggered way of 60 degrees when the positive plate 904 and the negative plate 905 are mounted during the assembly of the plates, so that the front surfaces of the positive plate 904 and the negative plate 905 are basically in the same plane, and the back surfaces of the positive plate 904 and the negative plate 905 are basically in the same plane; the design not only ensures the assembly of the diode and the hollow rivet, but also reduces the volume of the rotary rectifier;

the positive plate 904 and the negative plate 905 are respectively provided with a positive plate rivet mounting hole 916 and a negative plate rivet mounting hole 917, and a positive plate rivet 918 and a negative plate rivet 919 for fixing the main rotor excitation wire 921 are respectively mounted in the positive plate rivet mounting hole 916 and the negative plate rivet mounting hole 917;

the positive plate rivets 918 and the negative plate rivets 919 are hollow copper pipes with silver plated on the outer portions, the inner diameters of the positive plate rivets 918 and the negative plate rivets 919 are matched with a main rotor excitation wire, the positive plate rivets 918 and the negative plate rivets 919 are correspondingly riveted in positive plate rivet mounting holes 916 and negative plate rivet mounting holes 917 during installation, and current after rectification is transmitted to a main rotor excitation winding through the main rotor excitation wire welded on the positive plate rivets 918 and the negative plate rivets 919; the method not only solves the problem that the pole plates of the aluminum product cannot be welded, but also increases the contact area of the excitation wire 921 of the main rotor and the rotating rectifier, improves the electric conduction capability and reduces the loss caused by welding spots.

In fig. 9, one end of the diode is a pin, the other end is a socket, and the height of the socket is H3; the diode seat is provided with a metal shell with the height of about 1/2H 3 at the lower end and an epoxy sealing layer with the height of about 1/2H 3 at the upper end; the diameter of the metal shell is slightly larger than that of the epoxy resin sealing layer;

the pins of the diode (ZD 1) 909, the diode (ZD 2) 910 and the diode (ZD 3) 911 on the positive plate 904 are anodes, and the metal shell in the tube seat is a cathode; the pins of the diode (ZD 4) 912, the diode (ZD 5) 913 and the diode (ZD 6) 914 on the negative plate 905 are cathodes, and the metal shell in the tube seat is an anode.

In fig. 10, 11, 12 and 13, diodes (ZD 1) 909, ZD2 and ZD3 are respectively arranged in three diode mounting holes uniformly distributed on the positive plate 904, the metal shells of the diode (ZD 1) 909, the diode (ZD 2) 910 and the diode (ZD 3) 911 are pressed in the diode mounting hole of the positive plate 904 in an interference manner, the bottom of the metal shell and the front surface of the positive plate 904 are positioned on the same plane, epoxy resin is filled in a gap between the epoxy resin sealing layer at the upper end of the tube seat and the diode mounting hole for reinforcement, so that a chip in the diode is prevented from being displaced under the action of centrifugal force, pins of the diode (ZD 1) 909, the diode (ZD 2) 910 and the diode (ZD 3) 911 are led out from the reverse surface of the positive plate 904, cathodes of the three diodes are connected with the positive plate 904 in a metal manner through press fitting, so that;

diodes (ZD 4) 912, diodes (ZD 5) 913 and diodes (ZD 6) 914 are respectively arranged in three diode mounting holes uniformly distributed on the negative plate 905, wherein tube seat metal shells of the diodes (ZD 4) 912, diodes (ZD 5) 913 and diodes (ZD 6) 914 are pressed in the diode mounting holes of the negative plate 905 in an interference manner, the bottom of the metal shells and the back surface of the negative plate 905 are positioned on the same plane, epoxy resin is filled in gaps between epoxy resin sealing layers at the upper ends of the tube seats and the diode mounting holes for reinforcement, so that the chips in the diodes are prevented from being displaced under the action of centrifugal force, pins of the diodes (ZD 4) 912, the diodes (ZD 5) 913 and the diodes (ZD 6) 914 are led out from the front surface of the negative plate 905, and anodes of the three diodes are connected with the metal of the negative plate 905;

the height H3 of the diode tube seat is the same as the height H1 of the diode mounting hole in the polar plate, and the design is that when the diode is mounted with the polar plate, the diode can be completely wrapped by the diode mounting hole, so that the influence of centrifugal force on the diode is effectively resisted;

when the positive plate 904 and the negative plate 905 are installed, the front faces of the positive plate 904 and the negative plate 905 are staggered by 60 degrees and are installed and fixed through six hollow rivets 908, three diode installation holes of the positive plate 904 and three diode installation holes of the negative plate 905 are staggered, the six hollow rivets 908 and six diodes are staggered, and the six hollow rivets 908 and the diodes on the positive plate 904 and the negative plate 905 are staggered, so that two rivets are arranged around each diode for fixation, and the firmness of the diode is improved; and the front side is opposite to each other, so that the reverse side of the whole rotary rectifier is smooth after the positive plate 904 and the negative plate 905 are installed, and pins of the diodes are led out from the front side of the rotary rectifier.

In fig. 14, 15 and 16, the bus bar assembly further includes three bus bar assemblies 923 uniformly distributed on the upper end of the positive plate 904 and fixed by six hollow rivets, the bus bar assemblies 923 are molded by an arc-shaped bus bar support 906 and a bus bar 907, the arc-shaped bus bar support 906 is used for fixing the bus bar 907, preventing the bus bar from deforming during high-speed rotation and insulating the bus bar 907 from the polar plate, and the bus bar 907 is used for connecting diodes on the positive and negative polar plates to form a rectifier bridge;

most of the existing rotating rectifiers are in a semi-annular structure, and components are not uniformly distributed; the rectifier bridge has more resistance and capacitance elements, the rectifier fixing mode is complicated, the diodes on the positive plate and the negative plate are not on the same plane, and the diode pins are different in length due to different heights of the planes. During high-speed rotation, the problems of uneven centrifugal force on components, one-side deviation of a rectifier, complex structure, poor heat dissipation and large volume of the rectifier and deformation of longer diode pins under the action of the centrifugal force are considered; the busbar part is adopted to solve the problem of electric connection between the positive plate diode and the negative plate diode, and the problem of deformation of a longer pin of the diode in the existing design is mechanically solved.

The bus bar support 906 is molded by plastic compression of an insulating material, hollow rivet mounting holes II matched with the hollow rivets 908 are formed in the two ends of the bus bar support 906, when the bus bar support 906 and the V-shaped notches are installed, the hollow rivet mounting holes II in the two ends of the bus bar support 906 and the positive plate 904 are positioned through the two hollow rivet mounting holes II in the arc positions, and therefore deviation of the bus bar supports 906 on the polar plate is prevented;

an insulating baffle extending inwards is integrally formed on the bus bar support 906, and the insulating baffle can effectively prevent the hollow rivet mounting hole from contacting with an adjacent polar plate so as to prevent the hollow rivet mounting hole from being electrically connected with the adjacent polar plate;

a bus bar 907 is fixed at one end of the bus bar support 906, one end of the bus bar 907 is connected with the anode end of a diode on the positive plate, and the other end of the bus bar 907 is connected with the cathode end of a diode on the negative plate; because busbar part is fixed on the positive plate, can effectively reduce the length of diode pin, reduce the effect that the diode pin received centrifugal force, increase the reliability of diode.

The bus bar 907 is made of steel, a hollow rivet mounting hole III matched with the hollow rivet 908 is formed in the bus bar 907, the hollow rivet mounting hole III in the bus bar 907 and the hollow rivet mounting hole in the bus bar support 906 are aligned and embedded into the bus bar support 906, and then the bus bar component is molded and pressed, so that the firmness and the insulating property of the wiring lug are improved;

an exciter excitation winding wire through hole is formed in the corresponding position of the bus bar support 906 and the bus bar 907 respectively, when the rotating rectifier is connected with an exciter, three-way input of an exciter A phase voltage 901, an exciter B phase voltage 902 and an exciter C phase voltage 903 is conducted through an exciter excitation winding wire, a negative plate 904 of the rotating rectifier sequentially passes through the bus bar support 906 and the corresponding exciter excitation winding wire through hole in the bus bar 907 to be welded with the three bus bars 907, and therefore when the rotating rectifier is subjected to transverse overturning, traction force of the exciter excitation winding wire can be prevented from transversely moving;

the hollow rivet 908 is also provided with an insulating gasket, and the insulating gasket is positioned between the positive plate 904 and the negative plate 905;

in fig. 17, a diode (ZD 1) 909, a diode (ZD 2) 910, and a diode (ZD 3) 911 are connected to the positive electrode plate 904 at the common cathode; diode (ZD 4) 912, diode (ZD 5) 913, and diode (ZD 6) 914 are connected to negative electrode plate 905 at the common anode, diode (ZD 1) 909 and the cathode of diode (ZD 4) 912 are electrically connected by a bus bar, diode (ZD 2) 910 and the cathode of diode (ZD 5) 913 are electrically connected by a bus bar, and diode (ZD 3) 911 and the cathode of diode (ZD 6) 914 are electrically connected by a bus bar.

In fig. 18, the three-stage brushless ac synchronous generator includes a generator rotor 3, a generator stator 4, a permanent magnet generator field part 5, a permanent magnet generator armature part 6, an exciter armature part 7, an exciter field part 8, a main generator field part 10, a main generator armature part 11, a controller 2, and a rotating rectifier.

The surge absorption by the rotating rectifier according to the present invention will be described below.

(1) When the load of the motor is suddenly unloaded, because the energy of the magnetic field in the motor can not be effectively released, the turn-to-turn and the output end of the excitation winding of the main generator can induce very high voltage surge. The surge voltage is applied between the positive electrode and the negative electrode of the rotating rectifier, after the breakdown voltage of the diode exceeds 2 times (the full bridge is one time of the half bridge) of an avalanche type or a Zener type, the three full bridge arms are subjected to reverse breakdown at the same time, the breakdown current can be linearly increased to about 6 times of the rated on-state current of a single tube, and the magnetic field energy is rapidly consumed. The voltage of the excitation winding end of the main generator is embedded at 2 times of the breakdown voltage of an avalanche type or Zener type diode, so that the output voltage spike of the main generator is obviously reduced.

(2) When the motor runs asymmetrically, the negative sequence current can generate induced voltage with twice rated frequency at the excitation winding of the main generator. The positive half-wave of the voltage exceeds 2 times (full bridge, half bridge are one time) of breakdown voltage of the avalanche type or Zener type diode, the three full bridge arms can be caused to be subjected to reverse breakdown at the same time, and the negative half-wave can be in a normal rectification state or a positive conduction state of the three full bridge arms according to the ratio of the output resistance of the rotary armature type exciter to the resistance of the exciting winding of the main generator and the sizes of respective reactances, so that overvoltage and a negative sequence magnetic field among the exciting windings are restrained.

(3) When the rotary rectifier works normally, the peak generated at the phase change moment in the rectification process can be released through reverse breakdown of an avalanche type or Zener type diode of a non-conductive bridge arm connected with a conductive bridge arm, so that the electromagnetic compatibility of the motor is improved.

It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (10)

1. A rotating commutator, comprising: the LED packaging structure comprises a positive plate (904) and a negative plate (905), wherein the positive plate (904) and the negative plate (905) are two hollow discs with the same structure, three diode mounting holes are uniformly distributed in the positive plate (904) and the negative plate (905), six hollow rivet mounting holes I are also uniformly distributed in the positive plate (904) and the negative plate (905), a diode is respectively mounted in each diode mounting hole, the cathodes of the three diodes are electrically connected with the positive plate, the anode ends of the other three diodes are electrically connected with the negative plate, three V-shaped notches are uniformly distributed in the peripheries of the positive plate (904) and the negative plate (905), and the V-shaped notches are in one-to-one correspondence with the diode; each diode is an avalanche diode or a Zener diode;

the positive faces of the positive plates (904) and the negative plates (905) are oppositely arranged and fixed in a 60-degree staggered mode through six hollow rivets (908) with insulating films (922) arranged outside, three diode mounting holes of the positive plates (904) and three diode mounting holes of the negative plates (905) are arranged in a staggered mode, and six hollow rivets (908) and six diodes are arranged in a staggered mode;

the novel transformer is characterized by further comprising three bus bar components (923) uniformly distributed at the upper end of the reverse side of the positive plate (904), V-shaped notches of the bus bar components (923) and the positive plate (904) are distributed in a staggered mode, each bus bar component (923) comprises an arc bus bar support (906) and a bus bar (907) fixedly connected with one end of the bus bar support (906), two ends of each bus bar support (906) are respectively provided with a hollow rivet mounting hole II matched with the hollow rivet (908), two ends of each bus bar (907) are respectively connected to a diode anode end arranged on the positive plate and a diode cathode end arranged on the negative plate, exciter exciting winding wire through holes are respectively arranged at corresponding positions of the bus bar supports (906) and the exciter exciting winding wire through holes arranged on the negative plates, and three reverse side exciting winding wires sequentially pass through the corresponding bus bar supports (906) along the negative plates, and the exciter exciting winding wire through holes arranged on the bus bars (907) and an, The exciter B-phase voltage (902) and the exciter C-phase voltage (903) are electrically connected.

2. A rotary rectifier according to claim 1, wherein: the three diode mounting holes of the positive plate (904) and the negative plate (905) are positioned on the circumference of a concentric circle which is concentric with the positive plate (904) and the negative plate (905); six hollow rivet mounting holes on the positive plate (904) and the negative plate (905) are positioned on the circumference of a concentric circle which is concentric with the positive plate (904) and the negative plate (905); the distance between the diode mounting hole and the corresponding positive plate (904) and negative plate (905) is smaller than the distance between the hollow rivet mounting hole and the corresponding positive plate (904) and negative plate (905).

3. A rotary rectifier according to claim 1, wherein: each diode mounting hole and each hollow rivet mounting hole I are of cylindrical structures, one end face of each diode mounting hole and one end face of each hollow rivet mounting hole are flush with the reverse side of the corresponding positive plate (904) and negative plate (905), and the other end face of each diode mounting hole and one end face of each hollow rivet mounting hole extend out of the corresponding positive plate (904) and negative plate (905) front sides; the height of the diode mounting hole is matched with that of the diode tube seat, the height of the diode mounting hole is H1, the height of the hollow rivet mounting hole is H2, and the height H2 of the hollow rivet mounting hole is smaller than the height H1 of the diode mounting hole.

4. A rotary rectifier according to claim 1, wherein: and the positive plate (904) and the negative plate (905) are respectively provided with a pole plate rivet mounting hole, and a pole plate rivet used for fixing the excitation wire of the main rotor is respectively mounted in the pole plate rivet mounting holes.

5. A rotary rectifier according to claim 4 wherein: the pole plate rivet is a hollow copper pipe with the outer part plated with silver, and the inner diameter of the pole plate rivet is matched with the excitation wire of the main rotor.

6. A rotary rectifier according to claim 1, wherein: the bus bar (907) is provided with a hollow rivet mounting hole III corresponding to the hollow rivet mounting hole II on the bus bar bracket (906); an insulating baffle is integrally formed on the bus bar support (906).

7. A rotary rectifier according to claim 1, wherein: the hollow rivet (908) is also provided with an insulating gasket, and the insulating gasket is positioned between the positive plate (904) and the negative plate (905).

8. A rotary rectifier according to claim 1, wherein: the positive plate (904) and the negative plate (905) are evenly distributed with arc-shaped bosses, the cross sections of the bosses are T-shaped structural reinforcing ribs (920), and the three reinforcing ribs (920) and the three V-shaped notches are distributed in a staggered mode.

9. A rotary rectifier according to claim 1, wherein: the diode comprises a tube seat and a pin connected to the tube seat, the tube seat comprises a metal shell section positioned at the lower part and an epoxy resin sealing layer connected to the upper end of the metal shell section, the diameter of the metal shell is larger than that of the epoxy resin sealing layer, and the height of the tube seat is H3; and epoxy resin is injected into the gap between the diode and the diode mounting hole.

10. A three-stage brushless AC synchronous generator is characterized in that: comprising a generator rotor (3), a generator stator (4), a permanent magnet generator excitation part (5), a permanent magnet generator armature part (6), an exciter armature part (7), an exciter excitation part (8), a main generator excitation part (10), a main generator armature part (11), a controller (2) and a rotary rectifier according to any of claims 1-9.

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