WO2020034266A1

WO2020034266A1 - Permanent magnet motor and modular rotor structure thereof

Info

Publication number: WO2020034266A1
Application number: PCT/CN2018/103744
Authority: WO
Inventors: 龚天明; 李进泽; 周向; 李华; 赵震; 梁双全; 邵平安; 徐松
Original assignee: 中车株洲电机有限公司
Priority date: 2018-08-13
Filing date: 2018-09-03
Publication date: 2020-02-20
Also published as: AU2018431391B2; BR112020006203A2; AU2018431391A1; CN108923557A; CN108923557B

Abstract

A modular rotor structure and a permanent magnet motor comprising a modular rotor structure, the modular rotor structure comprising a module connecting flange and at least two rotor modules that are segmented in the circumferential direction, and the rotor modules comprising a module magnetic pole, a module magnetic yoke used for installing the module magnetic pole, a module fixing plate, and a module rib plate used for removably connecting adjacent rotor modules; the module rib plate is fixedly connected to the module magnetic yoke, the module magnetic yoke is fixedly connected to the module fixing plate, and the module fixing plate is removably connected to the module connecting flange. Compared to the existing technology, the modular rotor structure provided by the present invention may achieve the modularization of a rotor assembly, which solves the problem wherein land transportation is limited for high-power motors due to the outer diameter being too large.

Description

Permanent magnet motor and its modular rotor structure

This application claims priority from a Chinese patent application filed on August 13, 2018 with the Chinese Patent Office, application number 201810916513.5, and the invention name is "a permanent magnet motor and its modular rotor structure", the entire contents of which are incorporated by reference. In this application.

Technical field

The invention relates to the technical field of electric machines, and more particularly, to a modular rotor structure. In addition, the present invention also relates to a permanent magnet motor including the above-mentioned modular rotor structure.

Background technique

With the development of motor technology, permanent magnet motors continue to develop in the direction of high power, and the pace of new high-power main models replacing low-power models has become faster. Especially in recent years, with the rise of offshore wind power, the trend of large-capacity single machines has become more apparent.

The increase of the motor power will inevitably make the volume and weight of the motor larger and larger, and the transportation problems brought about by it will also become prominent. Currently limited by the width of land transportation, the outer diameter of the motor is generally not more than 5m. Therefore, when the outer diameter of the motor exceeds 5m, the transportation mode of the motor will be limited. At the same time, the increase in the outer diameter of the motor will increase the difficulty of transportation during transportation, which will increase the transportation cost.

In the prior art, in order to avoid the transportation problem caused by the excessively large outer diameter of the motor, it was forced to choose to control the outer diameter of the high-power motor and use a method of lengthening the axial length to meet the motor's power requirements. However, the increase of the axial length of the motor will reduce the utilization rate of the material of the motor, which will increase the production cost and reduce the competitiveness of the product.

In summary, how to avoid the limitation on the outer diameter of the motor by the width of land transportation without increasing the production cost is a problem to be solved urgently by those skilled in the art.

Summary of the Invention

In view of this, the object of the present invention is to provide a modular rotor structure that avoids the limitation of land transportation width without increasing the production cost, thereby solving the problem of high power motors being limited by land transportation due to an excessively large outer diameter.

Another object of the present invention is to provide a permanent magnet motor including the above-mentioned rotor structure.

In order to achieve the above objective, the present invention provides the following technical solutions:

A modular rotor structure includes a module connection flange and at least two rotor modules segmented in a circumferential direction. The rotor module includes a module magnetic pole, a module yoke for installing the module magnetic pole, a module fixing plate, and a For detachably connecting the module ribs adjacent to the rotor module, the module ribs are fixedly connected to the module yoke, the module yoke is fixedly connected to the module fixing plate, and the module fixing plate is The module connection flange is detachably connected.

Preferably, one module yoke includes at least one module magnetic pole mounting plane, and the angles between all adjacent module magnetic pole mounting planes are the same.

Preferably, the module magnetic pole installation planes in all the module yokes are equal to the center distance of the modular rotor assembly.

Preferably, the module magnetic pole mounting surfaces in all the module yokes are circular arc surfaces with the same radius.

Preferably, the module magnetic pole mounting surfaces in all the module yokes are equal to the center distance of the modular rotor assembly.

Preferably, the module fixing plate has a first through hole for adjusting the relative position of the module fixing plate and the module connection flange.

Preferably, the module fixing plate has a pin hole for pin drilling with the module fixing flange.

Preferably, the module rib has a second through hole for adjusting the relative position of the adjacent rotor modules.

Preferably, the module magnetic pole has an axially segmented structure.

A permanent magnet motor includes the modular rotor structure according to any one of the above.

Compared with the prior art, the modular rotor structure provided by the present invention can realize the modularization of the rotor assembly, and solves the problem that the high-power motor is limited by land transportation due to an excessively large outer diameter.

Because the rotor assembly is located outside the permanent magnet motor, the rotor module can be disassembled during transportation, that is, the connection between the rotor module and the module connection flange, and the connection between adjacent rotor modules, and then the rotor is disassembled. The assembled motor, rotor module, and rotor module connections are shipped separately. In this way, the outer diameter of the motor becomes the outer diameter of the stator assembly. As long as the outer diameter of the stator assembly is less than 5m, it can be transported by land without being restricted by the outer diameter of the motor during land transportation.

After the transportation is completed, the rotor assembly of the motor can be assembled, that is, the connection between the rotor module and the module connection flange, and the connection between adjacent rotor modules are fixed. In addition, in order to facilitate the transportation of the module magnetic poles, the module magnetic poles can be transported separately, and the module magnetic poles can be installed after the transportation is completed.

During the manufacturing process of the original integrated rotor structure, it is difficult to process, easily deformed, and the product scrap rate is high; the modular rotor structure provided by the present invention reduces the size of the machined parts and reduces the processing difficulty. Deformation is not easy to occur during processing, which improves the qualification rate of the product, thereby reducing production costs.

Therefore, the modular rotor structure provided by the present invention can avoid the limitation of land transportation width during the transportation of high-power motors, and also reduces the production cost and improves the market competitiveness of the product.

The permanent magnet motor including the above-mentioned modular rotor structure can be disassembled and then transported, thereby reducing the outer diameter size during transportation and avoiding the limitation of the outer diameter size of the motor by the width of land transportation.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly explain the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely It is an embodiment of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without paying creative labor.

1 is a partial schematic diagram of a specific embodiment of a permanent magnet motor provided by the present invention;

2 is a schematic structural diagram of a rotor module in FIG. 1;

3 is a schematic diagram of the three-dimensional structure of the rotor assembly in FIG. 1;

4 is a schematic cross-sectional view of the rotor module shown in FIG. 2;

5 is a schematic cross-sectional view of a modified structure of the rotor module shown in FIG. 2;

FIG. 6 is a schematic cross-sectional view of another modified structure of the rotor module shown in FIG. 2.

In Figure 1-6:

1 is the rotor assembly, 2 is the stator assembly, 3 is the air gap, 11 is the rotor module, 12 is the module connection flange, 13 is the module installation positioning pin, 14 is the module fixing plate fastener, 15 is the module rib plate Fastener, 111 is a module yoke, 112 is a module magnetic pole, 113 is a module rib, and 114 is a module fixing plate.

detailed description

In the following, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The core of the present invention is to provide a rotor structure that avoids the limitation of the land transportation width on the outer diameter of the motor without increasing the production cost. Another core of the present invention is to provide a permanent magnet motor including the above-mentioned rotor structure.

Please refer to FIGS. 1-6, FIG. 1 is a partial schematic diagram of a specific embodiment of a permanent magnet motor provided by the present invention; FIG. 2 is a schematic structural diagram of a rotor module in FIG. 1; FIG. 3 is a three-dimensional view of a rotor assembly in FIG. 1. Schematic diagram of the structure; Figure 4 is a schematic sectional view of the rotor module shown in Figure 2; Figure 5 is a schematic sectional view of a modified structure of the rotor module shown in Figure 2; Figure 6 is another type of rotor module shown in Figure 2 Schematic sectional view of the deformed structure.

The invention provides a modular rotor structure. The modular rotor structure includes at least two rotor modules 11 segmented in a circumferential direction. The rotor module 11 includes a module magnetic pole 112, a module yoke 111, a module rib plate 113, and a module fixing. Plate 114; and the module magnetic pole 112 is mounted on the module yoke 111. The module rib plate 113 and the module fixing plate 114 are fixedly connected to the module yoke 111. The module rib plate 113 is used to detachably connect the adjacent rotor module 11, The module fixing plate 114 is detachably connected to the module connection flange 12.

During the transportation of the motor, the modular rotor structure can be disassembled, that is, the connection between the rotor module 11 and the module connection flange 12 and the connections between the adjacent rotor modules 11 are removed, so that the outer diameter of the motor changes. It is the outer diameter size of the stator structure. It is only necessary that the outer diameter size of the stator structure meets the restrictions on the outer diameter size of the motor during land transportation. Because the stator structure is located inside the rotor structure and there is an air gap 3 between them, when the outer diameter of the motor stator structure meets the requirements for the outer diameter of the motor during land transportation, the outer diameter of the rotor structure can be larger than The limit size of the outer diameter of the motor during land transportation.

In the process of transportation, in order to facilitate the transportation of the module magnetic pole 112, the module magnetic pole 112 can be transported separately. After the transportation is completed, it can be installed on the module magnetic yoke 111; of course, it can also be installed on the module magnetic yoke first. 111, and then the rotor module 11 on which the module magnetic pole 112 is installed is transported.

Adjacent rotor modules 11 are detachably connected through module rib plates 113. The module rib plate fasteners 15 may be bolts or other connection methods that meet the requirements; between the module fixing plate 114 and the module connection flange 12 is For detachable connection, the module fixing plate fastener 14 may be a bolt, or other connection methods that meet requirements.

The rotor modules 11 in this modular rotor structure are distributed in sections along the circumferential direction. All the rotor modules 11 are combined in the circumferential direction to form the rotor assembly 1.

This modular rotor structure enables the high-power motor to disassemble the rotor assembly 1 during transportation, and then the stator assembly 2 and the rotor assembly 1 are transported separately, so that the outer diameter of the high-power motor during transportation becomes The outer diameter of the stator assembly 2. When the outer diameter of the stator assembly 2 meets the restrictions on the outer diameter of the motor during land transportation, the outer diameter of the rotor assembly 1 can be larger than the outer diameter of the motor during land transportation. Restrictions on size. Therefore, under the same land transportation rules, the outer diameter of high-power motors can be further increased, so that the power of the motor can be increased to meet the requirements of motor power and land transportation rules in actual production.

In addition, from the perspective of processing and manufacturing, the integrated rotor assembly is difficult to process during processing, and is easily deformed during processing, lifting, and transportation. The cost of scrap loss is high, which increases production. Cost of manufacturing. In the process of manufacturing the modular rotor structure, the size of the part is reduced, the processing difficulty is reduced, and the deformation is not easy to occur during use. Therefore, the cost of scrap loss is reduced, and the cost of manufacturing is further reduced, thereby increasing The market competitiveness of the product.

Therefore, the modular rotor structure can enable high-power motors to avoid the restrictions of land transportation regulations, and also reduce production costs and improve product competitiveness.

Based on the above specific embodiments, considering that some high-power motors have many poles, if there is only one magnetic pole mounting plane in a module yoke 111, more module yoke 111 needs to be processed, and the module yoke The larger the number of 111, the number of module ribs 113 and module fixing parts 114 will increase accordingly. The more connection parts that need to be removed and installed during the disassembly and installation process, the more complicated the operation process, so in a module magnetic At least one module magnetic pole mounting plane is set in the yoke 111, and the angles between all adjacent module magnetic pole mounting planes are the same, as shown in FIG. 5.

Specifically, the cross section of the module magnetic pole mounting plane in the module yoke 111 is a polygonal structure. After all the rotor modules 11 are assembled together, the cross sections of all the module magnetic pole mounting planes just form a positive circle with the same inscribed circle. Polygonal, and the distance between the magnetic pole mounting plane of all modules and the center of the rotor assembly is equal. Of course, due to installation or processing reasons, this regular polygon is only an approximate shape, and does not meet the strict size standards in the geometric definition. The module magnetic poles 112 are mounted on the module magnetic pole mounting surface of the module yoke 111, and all the module magnetic poles 112 are evenly distributed along the circumferential direction.

Increasing the number of module magnetic pole mounting planes in the module yoke 111 can reduce the number of rotor modules 11 so that the number of connections between adjacent rotor modules 11 and the number of connections between rotor modules 11 and module connection flanges 12 The number will decrease accordingly. Therefore, the process of assembling or disassembling the rotor module 11 is simpler and saves the time of disassembly and installation.

Of course, not all of the module yokes 111 have the same number of module magnetic pole mounting planes, and the number of the module magnetic pole mounting planes of the module yoke 111 in the same motor may be different.

Of course, the module magnetic pole mounting surface is set to be a flat surface here. This is also to consider that the module magnetic pole 112 has a mounting surface that is flat. Is flat. Based on the above specific embodiment, considering that the mounting surface of the module magnetic pole 112 has a circular arc surface, the module magnetic pole mounting surface of the module yoke 111 is a circular arc surface with the same radius.

Specifically, the cross sections of the module magnetic pole mounting surfaces in the module yoke 111 are circular arcs having the same radius. When all the rotor modules 11 are assembled together, the cross sections of all the module magnetic pole mounting surfaces just form a circle. And, the distance between the magnetic pole mounting surface of all modules and the center of the rotor assembly is equal. Of course, due to installation or processing reasons, this circle is only an approximate shape and does not meet the strict size standards in the geometric definition. The module magnetic poles 112 are mounted on the module magnetic pole mounting surface of the module yoke 111, and all the module magnetic poles 112 are evenly distributed along the circumferential direction.

The shape of the module magnetic pole mounting surface in the module yoke 111 is a circular arc surface, which can be matched with the installation of the module magnetic pole 112 with a circular arc surface. At the same time, in the process of processing, compared with the processing of a polygonal structure, During the processing process, operations such as centering and angle measurement are not required, which makes the processing process simpler, easier to operate, and saves processing time, thereby reducing the cost of manufacturing and further improving the market competitiveness of the product.

Of course, the module magnetic pole mounting surface here can be a circular arc surface with a uniform angle, that is, each module yoke 111 has a module magnetic pole mounting surface of the same size, and the module magnetic pole 112 can adopt the same positioning structure during the installation process. Simple; of course, it can also be a circular arc surface with an uneven angle. Each module yoke 111 has a module pole mounting surface of a different size. In actual production, the specific situation and analysis, and actual production requirements shall prevail.

Based on the above specific embodiments, considering the uniformity of the air gap 3 between the rotor assembly 1 and the stator assembly 2 has a greater impact on the overall performance of the motor, and the higher the consistency of the air gap 3, the higher the motor performance The better, the connection between the rotor module 11 and the stator assembly 2 can be set as an adjustable structure, as shown in FIG. 2.

Specifically, a first through hole may be provided on the module fixing plate 114. This first through hole is larger than the size required at the connection point with the module connection flange 12, so the rotor module 11 and The relative position of the module connection flange 12 is adjusted, that is, the relative position between the rotor module 11 and the stator assembly 2 is adjusted, thereby adjusting the air gap 3. Then adjust the relative positions of all the rotor modules 11 and the module connection flanges 12 one by one to complete the adjustment of the air gap 3 consistency.

Since the air gap 3 in the present invention can be achieved by adjusting the relative positions of multiple rotor modules 11 and module connection flanges 12, compared to the previous integrated rotor structure, the air gap can only be adjusted by adjusting the position of the entire rotor 3, the consistency of the adjusted air gap 3 in the embodiment of the present invention is higher, and the performance of the motor will be improved accordingly.

Of course, the first through hole here can be of any shape, as long as the relative position between the rotor module 11 and the module connection flange 12 can be adjusted, and it can also be used to fix the connection between the rotor module 11 and the module connection flange 12 Location.

On the basis of the above specific embodiment, considering that the adjustment process of the air gap 3 consistency is relatively complicated, a number of pin holes can be processed on the module fixing plate 114, and the relative positions of the rotor module 11 and the module connection flange 12 can be adjusted. Later, positioning is performed by means of pin holes and drills, so that the air gap 3 does not need to be adjusted again during the next installation.

Specifically, there are several pin holes in the module fixing plate 114. After the consistency adjustment of the air gap 3 between the rotor module 11 and the stator assembly 2 is completed, the pin hole on the module fixing plate 114 is used to connect the module. Blue 12 performs pin hole matching drilling and marks the parts that are connected to each other. In this way, after disassembly again, the positioning and restoration assembly process only needs to install the corresponding pin hole mounting module with the positioning pin 13 without readjustment. The consistency of the air gap 3 avoids the complicated operation of repeatedly adjusting the air gap 3 and saves working time.

It should be further explained that the pin hole matching drill here means that the module fixing plate 114 has pin holes, and the module connection flange 12 does not have pin holes. When the consistency adjustment of the air gap 3 is completed, the corresponding module is fixed. For the pin hole positions on the plate 114, a pin hole matched with the pin hole on the module fixing plate 114 is processed at a position corresponding to the module connection flange 12.

Based on the above specific embodiment, considering that adjacent rotor modules 11 need to be connected through a module rib 113, a second through hole for adjusting the connection position is provided in the module rib 113.

During the adjustment of the air gap 3, not only the relative position between the module fixing plate 114 and the module connection flange 12 needs to be adjusted, but sometimes the relative position between adjacent rotor modules 11 also needs to be adjusted, so in the module rib plate 113 The second through hole for adjusting the connection position of the adjacent rotor modules 11 is machined on, and the fastening position can be adjusted at any time according to the adjustment of the air gap 3. At the same time, the second through hole can also be used for fixing the adjacent rotor modules 11 to make the connection of the adjacent rotor modules 11 tighter and avoid loosening under high-speed rotation during work.

Of course, the fastening method here can be bolt fastening, in order to avoid loosening, you can use a suitable glue to fasten. It can also be other fastening and loosening prevention methods, which will not be repeated here.

In addition, the second through hole here may have any shape, as long as the relative position between adjacent rotor modules 11 can be adjusted, and it can also be used to fix the adjacent rotor modules 11.

It should be further explained that the first through hole mentioned in the present invention is a through hole on the module fixing plate 114 for adjusting the relative position of the module fixing plate 114 and the module connection flange 12, and the second through hole is a module rib plate. The through holes on 113 for adjusting the relative positions of the adjacent rotor modules 11 are only for distinguishing the through holes in different positions, and there is no order of priority.

Based on the above specific embodiments, considering that the module magnetic pole 112 is difficult during processing and installation, the module magnetic pole 112 is designed as an axially segmented structure.

The axially segmented module magnetic pole 112 is shorter in the length direction than before, and the magnetic force is smaller during installation than before, and is less affected by the magnetic force during installation, so the difficulty of the installation process is reduced. In addition, after the size becomes shorter, The module magnetic pole 112 is also relatively simple in the process of processing and manufacturing, which reduces the difficulty of processing and manufacturing.

In addition to the above-mentioned modular rotor structure, the present invention also provides a permanent magnet motor including the modular rotor structure disclosed in the above embodiments. For the structure of other parts of the permanent magnet motor, please refer to the prior art, which will not be described herein again.

The embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same and similar parts between the embodiments, refer to each other. Any combination of all the specific embodiments is within the protection scope of the present invention, and details are not described herein.

The modular rotor structure provided by the present invention and the permanent magnet motor including the modular rotor structure are described in detail above. Specific examples are used herein to explain the principle and implementation of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core ideas. It should be noted that, for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

A modular rotor structure is characterized in that it comprises a module connecting flange (12) and at least two rotor modules (11) segmented in a circumferential direction. The rotor module (11) includes module magnetic poles (112), A module yoke (111), a module fixing plate (114) for mounting the module magnetic pole (112), and a module rib (113) for detachably connecting an adjacent rotor module (11), the module The rib plate (113) is fixedly connected to the module yoke (111), the module yoke (111) is fixedly connected to the module fixing plate (114), and the module fixing plate (114) is connected to the module The flange (12) is detachably connected.
The modular rotor structure according to claim 1, wherein one module yoke (111) includes at least one module magnetic pole mounting plane, and the angles between all adjacent module magnetic pole mounting planes are the same.
The modular rotor structure according to claim 2, characterized in that the module magnetic pole installation planes in all of the modular yokes (111) are equal to the center distance of the modular rotor assembly.
The modular rotor structure according to claim 1, wherein the module magnetic pole mounting surfaces in all the module yokes (111) are circular arc surfaces with the same radius.
The modular rotor structure according to claim 4, characterized in that the module magnetic pole mounting surfaces in all of the modular yokes (111) are equal to the center distance of the modular rotor assembly.
The modular rotor structure according to claim 1, wherein the module fixing plate (114) has a first section for adjusting the relative position of the module fixing plate (114) and the module connection flange (12). A through hole.
The modular rotor structure according to claim 1, wherein the module fixing plate (114) has a pin hole for pin hole drilling with the module connection flange (12).
The modular rotor structure according to claim 7, wherein the modular ribs (113) have second through holes for adjusting the relative position of the adjacent rotor modules (11).
The modular rotor structure according to any one of claims 1 to 8, wherein the modular magnetic poles (112) are axially segmented structures.
A permanent magnet motor includes a rotor structure, wherein the rotor structure is a modular rotor structure according to any one of claims 1 to 9.