Stator module of a hybrid excitation generator

Abstract

The invention discloses a stator module of a hybrid excitation generator, comprising an electric excitation winding assembly, an electric excitation stator core, a stator insulating end plate, a stator non-magnetic tooth slot section, a non-magnetic magnetic isolation plate, a main stator core and an armature; the core is composed of a main stator core and an electric excitation stator core axially spliced ​​together, a non-magnetic magnetic isolation plate is arranged between the two cores, and the electric excitation winding passes through the main stator core and the electric excitation stator core at the same time, so that the structure of the stator of the hybrid excitation generator is compactly arranged, and smooth adjustment of the air gap magnetic flux is achieved under the condition of occupying the axial space of the armature as little as possible; an annular electric excitation winding is arranged on a fin-type insulating skeleton, and a special conductor arrangement method is adopted, so that the inlet and outlet leads of the multi-turn electric excitation winding can pass through an axial hole, and axial and radial ventilation grooves are formed at the same time, which are connected with the axial ventilation grooves in the main stator core, which is beneficial to the overall heat dissipation of the generator core, the armature winding and the excitation winding, and improves the power density of the whole machine.

Description

Technical Field

[0001] The invention relates to the technical field of hybrid excitation generators, and in particular to a stator module of a hybrid excitation generator. Background Art

[0002] There are two magnetic potential sources in the hybrid excitation synchronous generator: permanent magnet magnetic potential and DC excitation magnetic potential. Permanent magnets generate main magnetic flux, and DC excitation generates auxiliary magnetic flux. The main magnetic flux generated by permanent magnets is adjusted by the auxiliary magnetic flux and the weak magnetic flux, so that the air gap magnetic field can be smoothly adjusted. When the generator speed changes and the load fluctuates, the generator output voltage can be kept constant.

[0003] The current hybrid excitation structures mainly include the following:

[0004] The hybrid excitation topology adopts the rotor permanent magnet excitation and rotor electric excitation structure. It is necessary to introduce DC auxiliary excitation on the rotor. In the patent with the publication number CN109951037A, the hybrid excitation rotor in the composite excitation structure is composed of an electric excitation rotor with a carbon brush slip ring structure and an invisible permanent magnet rotor. In the patent with the publication number CN109217599A, in order to avoid passing the slip ring lead on the rotor, an auxiliary generator mode is added to power the rotor excitation coil, and the motor structure is powered through the generator structure, so as to realize internal power supply. The motor structure and the generator structure respectively generate permanent magnet excitation flux and electric excitation flux. The two are organically combined to jointly affect the air gap magnetic field inside the motor. By changing the magnitude and direction of the excitation current, the air gap magnetic field can be flexibly adjusted. Obviously, the rotor composite excitation structure inevitably causes the complicated manufacture of the motor accessories around the rotor, or the introduction of slip rings and wiring in the rotor causes the motor failure rate to be high.

[0005] In the patent with publication number CN107276350A, the composite excitation structure adopts composite magnetic poles on the stator structure, including an outer stator, an inner stator and an intermediate rotor structure. The outer stator adopts the armature structure of an AC asynchronous motor, and the permanent magnet rotor poles and the electric excitation winding are assembled on the inner stator structure. The intermediate rotor is not equipped with permanent magnets. The permanent magnetic field and the electric excitation magnetic field are connected in parallel with each other, and the polarity of the excitation current and the excitation direction of the permanent magnet are set so that the directions of the permanent magnetic field and the electric excitation magnetic field in the public magnetic circuit are opposite, so as to realize the smooth regulation and control of the air gap magnetic field of the motor. Obviously, the motor structure of this method is too complicated, and the use of an inner and outer double stator structure will increase the radial size of the motor, weakening the advantages of the radial permanent magnet motor, and at the same time, the heat dissipation problem of the inner stator is difficult to solve.

[0006] In the patent with publication number CN110504810A, the composite excitation structure is mainly realized by the stator, and multiple stator units need to be set up to realize it. The structure of each stator unit includes 2 short armature cores, 2 cylindrical permanent magnet excitation units, 2 long armature cores, and 2 annular excitation coil units. The air gap magnetic field of the motor is adjusted by the permanent magnet excitation unit and the annular excitation coil unit. Obviously, the stator structure of this method is extremely complex, and the auxiliary excitation increases the axial size of the motor, which is not conducive to the improvement of the motor power density. Summary of the invention

[0007] The purpose of the present invention is to provide a stator module of a hybrid excitation generator to solve the problems existing in the above-mentioned prior art. The core of the stator module is composed of a main stator core and an electric excitation stator core axially spliced ​​together, and a non-magnetic magnetic isolation plate is arranged between the two cores. The three-phase armature winding passes through the main stator core and the electric excitation stator core at the same time, so that the structure of the stator of the hybrid excitation generator is compact, and the smooth adjustment of the air gap flux is achieved under the condition of occupying the armature axial space as little as possible. In addition, the axial ventilation holes of the yoke of the main stator core and the axial and radial ventilation grooves formed by the coil support insulation bridge and the fin-type insulation frame in the electric excitation winding assembly together constitute the internal ventilation duct of the generator, which is beneficial to the overall heat dissipation of the generator core, armature winding and excitation winding, and is beneficial to improving the power density of the whole machine.

[0008] To achieve the above object, the present invention provides the following solutions:

[0009] The present invention provides a stator module of a hybrid excitation generator, comprising an electric excitation winding assembly, an electric excitation stator core, a stator insulating end plate, a stator non-magnetic tooth slot segment, a non-magnetic magnetic isolation plate, a main stator core and an armature; the electric excitation winding assembly is nested in the outer ring of the stator non-magnetic tooth slot segment, and is sandwiched between two electric excitation stator cores to form an electric excitation stator assembly; the stator insulating end plate is arranged at the outer end of the electric excitation stator core on one side, and the non-magnetic magnetic isolation plate is arranged between the electric excitation stator core and the main stator core on the other side, so as to separate the electric excitation stator assembly from the main stator core, thereby forming an axial isolation zone between a main magnetic circuit and an auxiliary excitation magnetic circuit;

[0010] When the motor is embedded, a plurality of armature windings pass through the main stator core, the non-magnetic magnetic isolation plate, the stator non-magnetic tooth slot section and the electric excitation stator core in sequence along the axial direction, wherein a plurality of tooth slots are circumferentially arranged on the stator non-magnetic tooth slot section and the non-magnetic magnetic isolation plate for embedding the armature windings and tightly fitting with the armature windings; the winding direction of the electric excitation winding of the electric excitation winding assembly is perpendicular to the axis of the generator and is orthogonal to the effective side of the coil of the armature winding.

[0011] Preferably, the electric excitation winding assembly comprises a coil support insulating bridge, a fin-type insulating frame, an inner ring electric excitation winding, a middle ring electric excitation winding, an outer ring electric excitation winding and a magnetic conductive sleeve;

[0012] The inner ring electric excitation winding, the middle ring electric excitation winding and the outer ring electric excitation winding are wound on the outer circle of the fin-type insulating skeleton in sequence; wherein the inner ring electric excitation winding and the middle ring electric excitation winding are odd-numbered coils, and the outer ring electric excitation winding is an even-numbered coil; the inner ring electric excitation winding and the middle ring electric excitation winding, as well as the middle ring electric excitation winding and the outer ring electric excitation winding are separated by the coil supporting insulating bridge frame; the magnetic conductive sleeve is sleeved on the outer side of the outer ring electric excitation winding; the magnetic conductive sleeve is a full-circle magnetic conductive steel and is against the electric excitation stator core.

[0013] Preferably, the fin-type insulating skeleton includes an annular skeleton and multiple groups of fins circumferentially distributed on the outer circle of the skeleton, each group of fins includes fin one, fin two and fin three, fin one and fin three are located at the upper and lower boundaries of the skeleton, constituting the limiting boundaries of the electric excitation winding; at least one fin two is provided, and is arranged between fin one and fin three, axially dividing the electric excitation winding winding channel between fin one and fin three, and a radial ventilation groove can be formed between two axially adjacent groups of electric excitation windings.

[0014] Preferably, the coil supporting insulating bridge is a U-shaped bracket frame structure. After the inner ring electric excitation winding is wound, a plurality of the coil supporting insulating bridges are arranged to circumferentially cover the outside of the inner ring electric excitation winding, and the middle ring electric excitation winding is wound on the outer rings of the plurality of coil supporting insulating bridges. A layer of the coil supporting insulating bridge is arranged outside the middle ring electric excitation winding, and the coil supporting insulating bridge outside the inner ring electric excitation winding corresponds one-to-one to the coil supporting insulating bridge outside the middle ring electric excitation winding. The outer ring electric excitation winding is wound on the outer ring of the coil supporting insulating bridge outside the middle ring electric excitation winding. By setting the coil supporting insulating bridge, axial ventilation grooves are formed between the inner ring electric excitation winding and the middle ring electric excitation winding, and between the middle ring electric excitation winding and the outer ring electric excitation winding.

[0015] Preferably, the main stator core, the non-magnetic isolation plate, the electrically excited stator core and the stator insulating end plate are circumferentially provided with interconnected ventilation holes, and a plurality of through holes are circumferentially provided.

[0016] Preferably, the main stator core, the electric excitation stator core and the magnetic conductive sleeve are assembled with the casing by flat keys to transmit the torque of the generator.

[0017] Compared with the prior art, the present invention has achieved the following beneficial technical effects:

[0018] 1. The stator module of the hybrid excitation generator provided by the present invention comprises an iron core composed of a main stator iron core and an electric excitation stator iron core axially spliced ​​together, a non-magnetic magnetic isolation plate is arranged between the two iron cores, and the three-phase armature winding passes through the main stator iron core and the electric excitation stator iron core at the same time, so that the structure of the stator of the hybrid excitation generator is compactly arranged, and smooth adjustment of the air gap flux is achieved while occupying as little axial space as possible for the armature.

[0019] 2. The stator module of the hybrid excitation generator provided by the present invention has a multi-layer annular electric excitation winding arranged on a fin-type insulating frame, and the multi-layer annular electric excitation winding adopts a special conductor arrangement method, so that the input and output leads of the multi-turn electric excitation winding are arranged at a nearby position on the same side of the stator module, so that the input and output leads can pass through an axial hole, which is convenient for the DC output terminal of the electric excitation coil to be arranged adjacent to the three-phase high-voltage output line.

[0020] 3. Multi-layer annular electric excitation windings are arranged on the coil support insulation bridge and fin-type insulation frame to form axial and radial ventilation grooves, which are connected with the axial ventilation holes in the main stator core, which is very beneficial to the overall heat dissipation of the generator core, armature winding and excitation winding, and is beneficial to improving the power density of the whole machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a partial three-dimensional structural schematic diagram of the stator module of the hybrid excitation generator in the present invention;

[0023] Figure 2 It is a three-dimensional exploded view of a stator module of the hybrid excitation generator of the present invention;

[0024] Figure 3 It is a schematic diagram of a partial three-dimensional structure of the electric excitation winding assembly in the present invention;

[0025] Figure 4 It is a three-dimensional exploded view of the electric excitation winding assembly of the present invention;

[0026] Figure 5 It is a schematic diagram of the three-dimensional structure of the fin-type insulating frame in the present invention;

[0027] Figure 6A distribution diagram of ventilation grooves of an electric excitation winding assembly in the present invention;

[0028] Figure 7 A diagram showing the distribution of the wind cooling path of the stator module of the hybrid excitation generator of the present invention;

[0029] In the figure: 1-electric excitation winding assembly, 2-electric excitation stator core, 3-stator insulation end plate, 4-stator non-magnetic tooth slot section, 5-non-magnetic magnetic isolation plate, 6-main stator core, 7-armature, 8-stator core flat key 1, 9-stator core flat key 2;

[0030] 101-coil supporting insulating bridge, 102-fin-type insulating skeleton, 103-inner ring electric excitation winding, 104-middle ring electric excitation winding, 105-outer ring electric excitation winding, 106-magnetic sleeve; 1021-fin one, 1022-fin two, 1023-fin three, 1024-skeleton, 10201-radial ventilation groove, 10301-axial ventilation groove, 201-ventilation holes on the electric excitation stator core, 301-ventilation holes on the stator insulating end plate, 601-ventilation holes on the main stator core. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] The purpose of the present invention is to provide a stator module of a hybrid excitation generator to solve the problems existing in the prior art.

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] The stator module of the hybrid excitation generator in this embodiment is as follows: Figure 1 , Figure 2 As shown, it includes an electric excitation winding assembly 1, an electric excitation stator core 2, a stator insulating end plate 3, a stator non-magnetic tooth slot segment 4, a non-magnetic magnetic isolation plate 5, a main stator core 6, an armature 7 and a stator core flat key; the electric excitation winding assembly 1 is nested in the outer ring of the stator non-magnetic tooth slot segment 4, and is sandwiched between two electric excitation stator cores 2 to form an electric excitation stator assembly; the stator insulating end plate 3 is arranged at the outer end of the electric excitation stator core 2 on one side, and the non-magnetic magnetic isolation plate 5 is arranged between the electric excitation stator core 2 and the main stator core 6 on the other side, separating the electric excitation stator assembly from the main stator core 6, and forming an axial isolation area between the main magnetic circuit and the auxiliary excitation magnetic circuit.

[0035] When the motor is embedded, a number of armatures 7 axially pass through the main stator core 6, the non-magnetic magnetic isolation plate 5, the stator non-magnetic tooth slot segment 4 and the electric excitation stator core 2 in sequence, wherein the stator non-magnetic tooth slot segment 4 and the non-magnetic magnetic isolation plate 5 are circumferentially provided with a number of tooth slots for embedding the armature 7 and fitting tightly with the armature 7, which is beneficial to conduct the heat of the armature 7 to the casing, and the electric excitation winding only passes through the electric excitation core, thereby minimizing the axial overlap of the two windings and not increasing the axial size of the generator; the winding direction of the electric excitation winding of the electric excitation winding assembly 1 is perpendicular to the axis of the generator and orthogonal to the effective side of the coil of the armature 7.

[0036] like Figure 3 , Figure 4 As shown, the electric excitation winding assembly 1 includes a coil supporting insulating bridge 101, a fin-type insulating frame 102, an inner ring electric excitation winding 103, a middle ring electric excitation winding 104, an outer ring electric excitation winding 105 and a magnetic conductive sleeve 106;

[0037] An inner ring electric excitation winding 103, a middle ring electric excitation winding 104 and an outer ring electric excitation winding 105 are wound on the outer circle of the fin-type insulating skeleton 102 in sequence; wherein the inner ring electric excitation winding 103 and the middle ring electric excitation winding 104 are odd-numbered coils, and the outer ring electric excitation winding 105 is an even-numbered coil, so that the inlet and outlet leads of the electric excitation winding are located at the same end and at the same angle, so as to facilitate the lead-out wires to the junction box; the inner ring electric excitation winding 103 and the middle ring electric excitation winding 104, and the middle ring electric excitation winding 104 and the outer ring electric excitation winding 105 are separated by a coil supporting insulating bridge 101, and a magnetic conductive sleeve 106 is sleeved on the outer side of the outer ring electric excitation winding 105. The magnetic conductive sleeve 106 is a full-circle magnetic conductive steel and is against the electric excitation stator core 2. When the electric excitation winding is energized, it is used to form an axial magnetic circuit channel.

[0038] When the electric excitation coil is energized, the auxiliary excitation flux enters the magnetic sleeve 106 from the electric excitation stator core 2, and then enters the electric excitation stator core 2 opposed to it from the magnetic sleeve 106 (due to the magnetic isolation effect of the non-magnetic magnetic isolation plate 5, the auxiliary excitation flux will not enter the main core), and then enters the stator-rotor air gap and then the rotor yoke, and returns to the electric excitation stator core 2 through the rotor yoke, forming an electric excitation closed loop; and then forms a mixed excitation magnetic field together with the main magnetic flux, and smoothly adjusts the main magnetic flux by adjusting the magnitude and direction of the current in the electric excitation winding.

[0039] like Figure 5 , Figure 6As shown, the fin-type insulating skeleton 102 includes an annular skeleton 1024 and a plurality of groups of fins circumferentially distributed on the outer ring of the skeleton 1024, each group of fins includes fin 1 1021, fin 2 1022 and fin 3 1023, fin 1 1021 and fin 3 1023 are located at the upper and lower boundaries of the skeleton 1024, forming the limit boundary of the electric excitation winding; at least one fin 2 1022 is provided, and is arranged between fin 1 1021 and fin 3 1023, axially dividing the electric excitation winding winding channel between fin 1 1021 and fin 3 1023, and radial ventilation grooves 10201 can be formed between two axially adjacent groups of electric excitation windings; the coil supporting insulating bridge 101 is a U-shaped bracket frame structure, and after the inner ring electric excitation winding 103 is wound, a plurality of wires are arranged The coil support insulating bridge frame 101 is circumferentially covered on the outside of the inner ring electric excitation winding 103, and the middle ring electric excitation winding 104 is wound on the outer ring of several coil support insulating bridge frames 101. A layer of coil support insulating bridge frames 101 is covered on the outside of the middle ring electric excitation winding 104, and the coil support insulating bridge frames 101 outside the inner ring electric excitation winding 103 correspond to the coil support insulating bridge frames 101 outside the middle ring electric excitation winding 104 one by one. The outer ring electric excitation winding 105 is wound on the outer ring of the coil support insulating bridge frames 101 outside the middle ring electric excitation winding 104. By setting the coil support insulating bridge frames 101, axial ventilation grooves 10301 are formed between the inner ring electric excitation winding 103 and the middle ring electric excitation winding 104, and between the middle ring electric excitation winding 104 and the outer ring electric excitation winding 105.

[0040] The inner ring electric excitation winding 103 and the middle ring electric excitation winding 104 use odd-numbered wire gauges, and the outer ring electric excitation winding 105 uses even-numbered wire gauges, so that the starting point and the end point of the excitation winding can be on the same side, and can be led out to the external output terminal by passing an insulating sleeve through an axial ventilation hole.

[0041] like Figure 7 As shown, the main stator core 6, the non-magnetic isolation plate 5, the electric excitation stator core 2 and the stator insulating end plate 3 are circumferentially opened with interconnected ventilation holes, and a number of through holes are circumferentially arranged, and axial ventilation grooves 10301 and radial ventilation grooves 10201 are formed in the multi-layer annular electric excitation winding and the fin-type insulating skeleton 102. In this way, the axial ventilation holes of the entire motor are connected, which is conducive to the formation of a circulating air path inside the generator, and can effectively cool the armature 7 winding and the excitation winding.

[0042] In this embodiment, the main stator core 6, the electrically excited stator core 2 and the magnetic sleeve 106 are all assembled with the casing by means of stator core flat keys to transmit the torque of the generator; the stator core flat keys include stator core flat key 1 8 and stator core flat key 2 9, stator core flat key 1 8 is arranged on the outer ring of one of the electrically excited stator cores 2 and the magnetic sleeve 106, and stator core flat key 2 9 is arranged on the outer ring of the other electrically excited stator core 2, the non-magnetic magnetic isolation plate 5 and the main stator core 6, and are shared by the electrically excited stator core 2, the non-magnetic magnetic isolation plate 5 and the main stator core 6.

[0043] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A stator module of a hybrid excitation generator, characterized in that: It includes an electric excitation winding assembly, an electric excitation stator core, a stator insulating end plate, a stator non-magnetic tooth slot segment, a non-magnetic magnetic isolation plate, a main stator core and an armature winding; the electric excitation winding assembly is nested in the outer ring of the stator non-magnetic tooth slot segment and is sandwiched between the two electric excitation stator cores to form an electric excitation stator assembly; the stator insulating end plate is arranged at the outer end of the electric excitation stator core on one side, and the non-magnetic magnetic isolation plate is arranged between the electric excitation stator core and the main stator core on the other side, separating the electric excitation stator assembly from the main stator core to form an axial isolation area between the main magnetic circuit and the auxiliary excitation magnetic circuit; When the motor is embedded, a plurality of armature windings pass through the main stator core, the non-magnetic magnetic isolation plate, the stator non-magnetic tooth slot section and the electric excitation stator core in sequence along the axial direction, wherein a plurality of tooth slots are circumferentially arranged on the stator non-magnetic tooth slot section and the non-magnetic magnetic isolation plate for embedding the armature windings and tightly fitting with the armature windings; the winding direction of the electric excitation winding of the electric excitation winding assembly is perpendicular to the axis of the generator and is orthogonal to the effective side of the coil of the armature winding.

2. The stator module of the hybrid excitation generator according to claim 1, characterized in that: The electric excitation winding assembly includes a coil support insulating bridge, a fin-type insulating frame, an inner ring electric excitation winding, a middle ring electric excitation winding, an outer ring electric excitation winding and a magnetic conductive sleeve; The inner ring electric excitation winding, the middle ring electric excitation winding and the outer ring electric excitation winding are wound on the outer circle of the fin-type insulating skeleton in sequence; wherein the inner ring electric excitation winding and the middle ring electric excitation winding are odd-numbered coils, and the outer ring electric excitation winding is an even-numbered coil; the inner ring electric excitation winding and the middle ring electric excitation winding, as well as the middle ring electric excitation winding and the outer ring electric excitation winding are separated by the coil supporting insulating bridge frame; the magnetic conductive sleeve is sleeved on the outer side of the outer ring electric excitation winding; the magnetic conductive sleeve is a full-circle magnetic conductive steel and is against the electric excitation stator core.

3. The stator module of the hybrid excitation generator according to claim 2, characterized in that: The fin-type insulating skeleton includes an annular skeleton and multiple groups of fins circumferentially distributed on the outer circle of the skeleton, each group of fins includes fin one, fin two and fin three, fin one and fin three are located at the upper and lower boundaries of the skeleton, forming the limiting boundaries of the electric excitation winding; at least one fin two is provided, and is arranged between fin one and fin three, axially dividing the electric excitation winding winding channel between fin one and fin three, and a radial ventilation groove can be formed between two axially adjacent groups of electric excitation windings.

4. The stator module of the hybrid excitation generator according to claim 3, characterized in that: The coil support insulating bridge is a U-shaped bracket frame structure. After the inner ring electric excitation winding is wound, a plurality of the coil support insulating bridges are arranged to circumferentially cover the outside of the inner ring electric excitation winding, and the middle ring electric excitation winding is wound on the outer rings of the plurality of coil support insulating bridges. A layer of the coil support insulating bridge is arranged outside the middle ring electric excitation winding, and the coil support insulating bridge outside the inner ring electric excitation winding corresponds one to one with the coil support insulating bridge outside the middle ring electric excitation winding. The outer ring electric excitation winding is wound on the outer ring of the coil support insulating bridge outside the middle ring electric excitation winding. By setting the coil support insulating bridge, axial ventilation grooves are formed between the inner ring electric excitation winding and the middle ring electric excitation winding, and between the middle ring electric excitation winding and the outer ring electric excitation winding.

5. The stator module of the hybrid excitation generator according to claim 4, characterized in that: The main stator core, the non-magnetic magnetic isolation plate, the electric excitation stator core and the stator insulating end plate are circumferentially provided with interconnected ventilation holes, and a plurality of the ventilation holes are circumferentially provided.

6. The stator module of the hybrid excitation generator according to claim 2, characterized in that: The main stator core, the electric excitation stator core and the magnetic conductive sleeve are all assembled with the casing by means of stator core flat keys, so as to transmit the torque of the generator.

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