CN220022441U - Rotor assembly - Google Patents

Abstract

The utility model discloses a rotor assembly, which comprises a rotor house, a magnetic steel module, a first fastener and a second fastener, wherein a slot is formed in the yoke surface of the rotor house, so that the first fastener is partially arranged in the slot, and partially exposed out of the yoke surface; the slot is used for installing the first fastener of fixed magnet steel module to not directly fix the magnet steel module, avoid processing the guide way of installation magnet steel module in the rotor interior circle, reduce the cost of milling flutes, first fastener and slot peg graft each other, also reduce the degree of difficulty and the cost of magnet steel module later maintenance.

Description

Rotor assembly

Technical Field

The utility model relates to the field of permanent magnet direct-drive wind generators, in particular to a rotor assembly.

Background

The arrangement mode of the outer rotor magnetic steel of the permanent magnet motor and the wind power generator is mainly fixed through surface mounting, the magnetic steel module is mainly composed of magnetic steel, a housing and a base plate, the structure is mainly applied to the permanent magnet wind power generator or the high-power permanent magnet motor, and the fixing mode of the structure and the rotor is mainly in a T-shaped groove or bolt fixing mode.

For the mode of fixed T type groove, the T type groove on the rotor can leave certain fit clearance with the magnet steel module to can pass through smoothly when the magnet steel module inserts, but during the motor operation, axial electromagnetic force and tangential force that produce under empty load and the full load state lead to the module to be in the same place with the rotor can not effectively adsorb, and rotor T type groove collision produces vibration abnormal sound. When the T-shaped groove is actually machined, the reactive force applied to the cutter during rotary cutting in the groove is large due to the small size of the groove opening, so that the feeding speed is low, the cutting is slow, the requirement on customizing the cutter is high, the diameter of a rotor is generally large, the number of holes is large, manufacturers and equipment for selectable machining are limited, the cost of drilling is high, and the installation is complicated due to the large number of magnetic steel modules.

Disclosure of Invention

The utility model provides a rotor assembly, which can solve the problems that a magnetic steel module is not firmly fixed in a rotor house and the processing cost of the rotor assembly is high in the prior art.

The utility model comprises the following steps:

the rotor assembly comprises a rotor house and a magnetic steel module, wherein a slot is formed in a magnet yoke surface of the rotor house, the slot is positioned in the rotor house, an opening is formed in the magnet yoke surface, the rotor assembly further comprises a first fastener and a second fastener, part of the first fastener is arranged in the slot, and the other part of the first fastener is exposed out of the magnet yoke surface through the opening; the second fastener is connected to the first fastener and located above the magnetic yoke surface, and the second fastener is used for pressing the magnetic steel module onto the magnetic yoke surface.

In the scheme, the rotor assembly adopts the rotor house with the structure, the first fastener and the rotor adopt the split type, the magnet yoke surface of the rotor house is provided with the slot, so that the first fastener is partially arranged in the slot, the part of the first fastener is exposed out of the magnet yoke surface, the second fastener is connected with the first fastener to fix the magnetic steel module on the magnet yoke surface of the rotor house, the magnetic steel module is fixed by adopting the mode that the first fastener and the second fastener are mutually matched, the assembly between the magnetic steel module and the rotor house is convenient, the cost for fixing the magnetic steel module after drilling holes on the rotor house in the prior art is reduced, and the loosening risk caused by corrosion due to the fact that the bolt holes are not in place in corrosion is avoided; simultaneously, the slot is used for installing the first fastener of fixed magnet steel module to do not directly fix the magnet steel module, avoid processing the guide way of installation magnet steel module in the rotor interior circle, reduce the cost of milling flutes, first fastener and slot peg graft each other, also reduce the degree of difficulty and the cost of magnet steel module later maintenance. The magnetic steel module is tightly pressed on the magnetic yoke surface through the combination of the second fastening piece and the first fastening piece, so that the magnetic steel module is fixed more firmly in the rotor house.

Preferably, the second fastening member includes a pressing member having a through hole and a bolt passing through the through hole to press the second fastening member against the yoke surface.

In this scheme, through the bolt on the branch tight piece of pressing, taut first fastener, the both sides of pressing the piece compress tightly the magnet steel module, can prevent effectively that the module from tangential displacement.

Preferably, the magnetic steel module comprises a substrate in contact with a yoke surface of the rotor house, wherein protrusions are arranged at two ends of the substrate along a tangential direction of the yoke surface, and the protrusions are abutted with the first fastening piece along an extending direction of the substrate.

In the scheme, the bottom top plate part of the magnetic steel module is canceled, the magnetic steel module is directly placed on a step formed by turning the inner circle of the rotor, and the turned step is directly used as a bottom module mounting surface, so that the cost is reduced; the protrusion is abutted with the first fastener, so that the magnetic steel module can be prevented from being displaced in the direction perpendicular to the first fastener in the process of installation or operation of the motor, and the installation and use reliability of the magnetic steel module is improved.

Preferably, the protrusions have a triangular cross section in a direction perpendicular to the rotor house axis direction; or alternatively, the first and second heat exchangers may be,

the protrusions have an arc-shaped cross section in a direction perpendicular to the axial direction of the rotor house.

In this scheme, with protruding design for above-mentioned shape, be convenient for with the magnet steel module fixed rotor's yoke face on, improved the reliability of magnet steel module in the operation in-process.

Preferably, the protrusions at the two ends of the substrate are symmetrically arranged about the central axis of the substrate.

In the scheme, by adopting the structure, the cutter with corresponding symmetrical angles can be customized in the manufacturing and processing process of the magnetic steel module, so that the processing cost is low; meanwhile, in the installation process, the magnetic steel module is convenient to install on the magnetic yoke surface, the installation direction is not limited, and the installation convenience of the magnetic steel module and the replaceability in the use process are improved.

Preferably, the second fastening member is close to the end face of the first fastening member, the projection of the second fastening member on the yoke surface covers the first fastening member, and a containing cavity is formed between the second fastening member and the yoke surface to contain the protrusion.

In this scheme, the projection of second fastener on the yoke face covers first fastener for the protruding and the first fastener butt of magnet steel module, second fastener and yoke face enclose into and hold the chamber and hold the arch, hold the chamber and make the arch only along being on a parallel with the axis direction of rotor room and remove, two adjacent hold the chamber and have restricted the rotation of magnet steel module and along the removal of the direction of perpendicular to yoke face, prevent that the magnet steel module from taking place to remove in the in-service along the direction of perpendicular to yoke face.

Preferably, the second fastener tapers in size in a direction away from the yoke face; and/or the number of the groups of groups,

the number of the slots is plural, and the plural slots are arranged in a direction of an outer circumference of the rotor house and extend in a direction parallel to an axis of the rotor house.

In this scheme, the second fastener sets up to above-mentioned structure, can be convenient for put into the space between the adjacent magnet steel module with the second fastener in, the sectional area that is close to the rotor house simultaneously is great, can produce great overlapping compaction area with the tip of magnet steel module, improved the reliability that the second fastener was compressed tightly to the magnet steel module, the slot sets up to above-mentioned structure, be convenient for process for in the course of working, rotate the rotor or along axial displacement processing slot's cutter or remove the rotor house, can accomplish the processing to the slot, the processing degree of difficulty has been reduced, the processing cost of slot has been reduced.

Preferably, the shape of the second fastening piece projected on the yoke surface is at least one of rectangle, waist shape and ellipse.

In this scheme, rectangle recess, waist shape recess and circular recess compare in other irregular cell type or have the cell type of edges and corners more do benefit to milling cutter and process, be convenient for process into corresponding shape on the magnetic field module, reduce the processing cost of magnet steel module.

Preferably, a projection of the opening in the direction of the bottom surface of the slot is located in the bottom surface of the slot, and the slot penetrates through the rotor house in the axial direction of the rotor house.

In the scheme, the projection of the opening on the bottom surface direction of the slot is positioned in the bottom surface of the slot, and the cross section area of the opening is smaller than the cross section area of the bottom of the slot, so that the first fastener can be clamped in the slot, the cost for fixing the magnetic steel module after the hole is drilled in the rotor in the prior art is reduced, and the loosening risk caused by corrosion due to insufficient corrosion of the bolt hole is avoided; the slot penetrates through the rotor house in the axial direction of the rotor house, and processing is facilitated.

Preferably, both ends of the slot have at least one of a triangular section or an arc section in a direction perpendicular to an axial direction of the rotor house; or alternatively, the first and second heat exchangers may be,

the cross section of the slot and the opening thereof in the direction vertical to the magnetic yoke surface is in a ladder shape.

In this scheme, the tip cross-section of magnet steel module design is triangle-shaped, ladder-type or curved slot, can customize the cutter of corresponding symmetry angle in the manufacturing process, for T type groove and the dovetail of prior art, cutter blade angle is convenient for cut, and the reaction force that the cutter bore is little, and the cutting dynamics is big, and feed rate is high, and the processing cost is low.

On the basis of the common general knowledge in the art, the above preferred technical schemes can be freely combined to obtain the preferred embodiments of the present utility model.

The utility model has the positive progress effects that: the rotor assembly adopts the rotor house with the structure, the first fastener and the rotor are in a split type, the magnet yoke surface of the rotor house is provided with the slot, so that the first fastener is partially arranged in the slot, the part of the first fastener is exposed out of the magnet yoke surface, the second fastener is connected to the first fastener to fix the magnetic steel module on the magnet yoke surface of the rotor house, the magnetic steel module is fixed by adopting a mode that the first fastener and the second fastener are mutually matched, the assembly between the magnetic steel module and the rotor house is convenient, the cost for fixing the magnetic steel module after drilling holes on the rotor house in the prior art is reduced, and the loosening risk caused by corrosion due to the fact that the bolt holes are not in place in corrosion is avoided; the slot is used for installing the first fastener of fixed magnet steel module to not directly fix the magnet steel module, avoid processing the guide way of installation magnet steel module in the rotor interior circle, reduce the cost of milling flutes, first fastener and slot peg graft each other, also reduce the degree of difficulty and the cost of magnet steel module later maintenance. The magnetic steel module is tightly pressed on the magnetic yoke surface through the combination of the second fastening piece and the first fastening piece, so that the magnetic steel module is fixed more firmly in the rotor house.

Drawings

Fig. 1 is a schematic partial front view of a rotor assembly according to a first embodiment of the present utility model.

FIG. 2 is a schematic partial front view of a rotor assembly according to another embodiment of the first embodiment of the present utility model

Fig. 3 is a schematic perspective view of a first fastener of a rotor assembly according to a first embodiment of the present utility model.

Fig. 4 is a schematic view showing a partial perspective view of a bead of a second fastener according to a first embodiment of the present utility model.

Fig. 5 is a schematic front view of a magnetic steel module of a rotor assembly according to a first embodiment of the present utility model.

Fig. 6 is a schematic front view of a magnetic steel module of a rotor assembly according to a first embodiment of the present utility model.

Fig. 7 is a schematic front view of a magnetic steel module of a rotor assembly according to a first embodiment of the present utility model.

Fig. 8 is a schematic partial structure of a slot of a magnetic steel module of a rotor assembly according to an embodiment of the utility model.

Description of the reference numerals

Rotor house 130

Yoke surface 10

Socket 20

First fastener 140

Screw hole 1401

First inclined plane 301

Second inclined plane 302

Magnetic steel module 110

Substrate 401

Protrusion 402

Third bevel 4021

Fourth bevel 4022

Cambered surface 405

Second fastener 150

Compression member 120

Through hole 1502

Bolt 100

Rotor assembly 2

Front end face 160

Detailed Description

The utility model will be further illustrated by way of example with reference to fig. 1-8, but the utility model is not thereby limited to the scope of the examples.

The present embodiment provides a rotor assembly for use in a direct-drive wind turbine, as shown in fig. 1-8, in which the direct-drive wind turbine is usually in the form of an outer rotor, and the rotor house 130 is exposed to an environment with a high altitude, high salt content and high humidity for a long period of time. As shown in fig. 1 and 2, the rotor assembly 2 includes the rotor house 130 as described above, and the rotor assembly 2 further includes the magnetic steel module 110 and the second fastening member 150, where the second fastening member 150 is connected to the first fastening member 140, and the second fastening member 150 compresses the magnetic steel module 110 on the yoke surface 10.

The rotor assembly 2 adopts the rotor house 130 with the structure, the first fastening piece 140 and the rotor adopt the split type, the magnet yoke surface 10 of the rotor house 130 is provided with the slot 20, the first fastening piece 140 is arranged in the slot 20, the dimension of the bottom of the slot 20 in the direction vertical to the length direction of the slot 20 is larger than the dimension of the opening of the slot 20 in the direction vertical to the length direction of the slot 20 on the magnet yoke surface, as shown in fig. 1 and 2, the first fastening piece 140 can be clamped in the slot 20, and the magnetic steel module 11 is fixed by adopting the mode that the first fastening piece 140 and the second fastening piece 150 are mutually matched, so that the assembly between the magnetic steel module 110 and the rotor house 130 is convenient, the cost of fixing the magnetic steel module 110 in a hole after the rotor house is drilled in the prior art is reduced, and the loosening risk caused by corrosion caused by the corrosion of the anticorrosion of the hole of the bolt 100 is avoided; the second fastening member 150 is connected to the first fastening member 140, and can firmly fix the magnetic steel module 110 on the yoke surface 10 of the rotor house 130, so that the assembly between the magnetic steel module 110 and the rotor house 130 is facilitated, and the difficulty and cost of later maintenance are reduced. The magnetic steel module 110 is pressed on the magnetic yoke surface 10 by combining the second fastening piece 150 with the first fastening piece 140, so that the problem that the magnetic steel module 110 is not firmly fixed in the rotor house 130 is solved.

Specifically, the yoke surface 10 of the rotor house 130 is provided with a positioning mechanism, the positioning mechanism is a slot 20, the slot 20 is used for accommodating the first fastener 140, the dimension of the bottom of the slot 20 in the direction perpendicular to the length direction of the slot 20 is larger than the dimension of the opening of the slot 20 on the yoke surface in the direction perpendicular to the length direction of the slot 20, the slot 20 extends at least and penetrates through one front end surface or one rear end surface of the rotor house 130, and as shown in fig. 2, the slot 20 penetrates through the front end surface 160 of the rotor house 130.

As shown in fig. 8, the yoke surface 10 of the rotor house 130 is provided with the slot 20, and the slot 20 is provided on the yoke surface 10, and the slot 20 penetrates one side surface of the rotor house 130. The first fastener 140 is arranged in the slot 20, the dimension of the bottom of the slot 20 in the direction perpendicular to the length direction of the slot 20 is larger than the dimension of the opening of the slot 20 on the magnetic yoke surface in the direction perpendicular to the length direction of the slot 20, so that the first fastener 140 can be clamped in the slot 20, part of the first fastener 140 is arranged in the slot 20, and the other part of the first fastener 140 leaks out of the magnetic yoke surface 10 through the opening, thereby reducing the cost of fixing the magnetic steel module 110 after drilling holes on a rotor in the prior art, and avoiding the loosening risk caused by corrosion due to the fact that the holes of the bolts 100 are not corroded in place; the slot 20 is used for installing the first fastener 140 for fixing the magnetic steel module 110, and is not used for directly fixing the magnetic steel module 110, so that the situation that the guide groove for installing the magnetic steel module 110 is machined in the rotor is avoided, compared with the prior art that the guide groove is drilled in the rotor, the difficulty and the cost of later maintenance of the magnetic steel module 110 are reduced due to the fact that the first fastener 140 is mutually inserted into the slot 20.

In other preferred embodiments, the slot 20 is provided on the yoke surface 10, and the slot 20 penetrates through both front and rear end surfaces of the rotor house 130; or, the slot 20 is disposed on the yoke surface 10, the slot 20 and the rotor house 130 are disposed in front and rear end surfaces, and the length of the slot 20 is smaller than the axial length of the rotor house 130, and in order to facilitate the installation of the first fastening member 140, annular grooves are disposed at the front and rear ends of the slot 20 on an axis parallel to the rotor house.

Specifically, as shown in fig. 1, the slot 20 has a first inclined surface 301 and a second inclined surface 302, and the first inclined surface 301 and the second inclined surface 302 are angled with each other. The cutter with corresponding symmetrical angles can be customized in the manufacturing and processing process, the angle of the cutting edge of the cutter is convenient for cutting, the reaction force born by the cutter is small, the cutting force is large, the feeding speed is high, and the processing cost is low.

In a preferred embodiment, as shown in fig. 2, the slot 20 is stepped in a direction perpendicular to the yoke face 10. Facilitating insertion of the first fastener 140 into the slot 20 from the front face 160 of the rotor house 130.

In other preferred embodiments, slot 20 is flanked by arcuate surfaces 405. The cutter with corresponding symmetrical angles can be customized in the manufacturing and processing process, the angle of the cutting edge of the cutter is convenient for cutting, the reaction force born by the cutter is small, the cutting force is large, the feeding speed is high, and the processing cost is low. The slot 20 may also be a half slot or a dovetail slot, which is not limited herein.

Specifically, the cross-sectional shapes of the ends of the two sides of the slot 20 are symmetrical to each other along the connection line between the center of the rotor house 130 and the center of the slot 20 on the yoke surface 10, so that the slot 20 can customize the cutters with corresponding symmetrical angles during the manufacturing process, the processing cost is low, the installation is easy, the installation direction is not limited, the corresponding first fastening members 140 can be assembled reversely, and the installation convenience and the replaceability of the first fastening members 140 during the use are improved.

Specifically, the second fastening member 150 includes a pressing member 120 and a bolt 100, the pressing member 120 has a through hole 1502, as shown in fig. 4, the bolt 100 passes through the through hole 1502 to press the second fastening member 150 onto the yoke surface 10, and by tightening the bolt 100 on the pressing member 120, the first fastening member 140 is tightened, and both sides of the pressing member 120 press the magnetic steel module 110, so that tangential displacement of the module can be effectively prevented. The magnetic steel module 110 is fixed by the pressing piece 120, so that abnormal sound generated by the magnetic steel module 110 and the rotor under certain working conditions of the T-shaped groove structure is avoided, the processing difficulty of groove type manufacturing is reduced, the efficiency is improved, and the cost is reduced.

Specifically, the magnetic steel module 110 includes a substrate 401 contacting the yoke surface 10 of the rotor house 130, wherein protrusions 402 are provided at two ends of the substrate 401 along the tangential direction of the yoke surface 10, as shown in fig. 5, along the extending direction of the substrate 401, the protrusions 402 abut against the first fastening members 140 of the yoke surface 10 of the rotor house 130, the bottom top plate part of the magnetic steel module 110 is eliminated, the magnetic steel module 110 is directly placed on a step formed by turning the inner circle of the rotor, and the turned step is directly used as a bottom module mounting surface, thereby reducing the cost; the protrusion 402 abuts against the first fastener 140 to prevent the magnetic steel module 110 from being displaced in a direction perpendicular to the first fastener 140 during the installation or the operation of the motor, so that the installation and use reliability of the magnetic steel module 110 is improved.

Specifically, the first fastener 140 is a rib plate, as shown in fig. 3, on which a plurality of threaded holes 1401 are axially arranged for mounting the pressing bar; the second fastening piece 150 is a bolt 100 and a pressing strip, the pressing strip is placed on the rib plate, two sides of the pressing strip are in contact with the magnetic steel module 110, the bolt 100 is connected with the rib plate through the pressing strip, the upper planes on two sides of the rib plate are in contact with the rotor house 130 to form reverse acting force through tightening the rib plate, and two sides of the pressing strip press the magnetic steel module 110; the mode of combining and fixing the bolt 100, the rib plate and the pressing strip can effectively solve the problem that the cost of milling the dovetail groove is multiplied due to the fact that the pressing strip is simply pressed by interference, and can avoid that errors are generated due to poor control when the interference tolerance of the dovetail groove is processed, and the assembly is too loose or too tight. In addition, the bolt 100, the rib plate and the pressing bar are combined and fixed, the matching shape of the rib plate and the rotor groove is low in processing difficulty and low in cost, the magnetic steel module 110 can be effectively pressed and fixed, and the problems of abnormal operation and the like are solved.

The second fastening member 150 is close to the end face of the first fastening member 140, the projection on the yoke surface 10 covers the first fastening member 140, and a containing cavity is formed between the second fastening member 150 and the yoke surface 10 to contain the protrusion 402, the protrusion 402 of the magnetic steel module 11 abuts against the first fastening member 140, the containing cavity enables the protrusion 402 to move only along the axial direction parallel to the rotor house 130, and the two adjacent containing cavities limit the rotation of the magnetic steel module 110 and the movement along the direction perpendicular to the yoke surface 10, so that the magnetic steel module 11 is prevented from moving along the direction perpendicular to the yoke surface 10 in use.

Specifically, the projection of the opening in the bottom surface direction of the slot 20 is located in the bottom surface of the slot 20, the slot 20 penetrates through the rotor house 130 in the axial direction of the rotor house 130, and the cross-sectional area of the opening is smaller than that of the bottom of the slot 20, so that the first fastener 140 can be clamped in the slot 20, the cost of fixing the magnetic steel module 110 after drilling holes in the rotor house 130 in the prior art is reduced, and the loosening risk caused by corrosion due to insufficient corrosion of the bolt holes is avoided; the slot 20 penetrates the rotor house 130 in the axial direction thereof, facilitating processing. In this embodiment, as shown in fig. 6, the end portions on both sides of the protrusion 402 have a triangular cross section, specifically, as shown in fig. 6, both sides of the protrusion 402 have adjacent third inclined surfaces 4021 and fourth inclined surfaces 4022, the third inclined surfaces 4021 and the fourth inclined surfaces 4022 are angled to each other and form a triangular cross section, and the protrusion 402 is designed into the above shape, so that the magnetic steel module 110 is fixed on the yoke surface 10 of the rotor, and the reliability of the magnetic steel module 110 in the operation process is improved.

In other preferred embodiments, as shown in fig. 7, the ends of the two sides of the protrusion 402 are curved surfaces 405, so as to prevent accidental injury to the assembly personnel during the assembly process.

In a preferred embodiment, the cross-sectional shapes of the end parts at two sides of the protrusion 402 are symmetrical to each other along the center of the magnetic steel module 110, and by adopting the structure, the cutter with corresponding symmetrical angle can be customized in the manufacturing and processing process of the magnetic steel module 110, so that the processing cost is low; meanwhile, in the installation process, the magnetic steel module 110 is convenient to install on the magnetic yoke surface 10, the installation direction is not limited, and the installation convenience of the magnetic steel module 110 and the replaceability in the use process are improved.

Specifically, along the direction close to the center of the rotor house 130, the cross-sectional area of the second fastening member 150 is reduced, and the second fastening member 150 is configured as described above, so that the second fastening member 150 can be conveniently placed into the space between the adjacent magnetic steel modules 110, and meanwhile, the cross-sectional area close to the rotor house 130 is larger, so that a larger overlapping compression area can be generated with the end of the magnetic steel module 110, and the reliability of compression of the second fastening member 150 on the magnetic steel module 110 is improved.

In a preferred embodiment, the slots 20 are arranged along the outer circumference of the rotor house 130, the slots 20 extend along the direction parallel to the axis of the rotor house 130, and the slots 20 are configured as described above, so that the processing is facilitated, and in the processing process, the processing of the slots 20 can be completed by rotating the rotor or axially moving the tool for processing the slots 20 or moving the rotor house 130, so that the processing difficulty is reduced, and the processing cost of the slots 20 is reduced.

The cross-sectional shapes of the end portions of both sides of the slot 20 are symmetrical to each other along the line connecting the center of the rotor house 130 and the center of the slot 20 in the yoke surface 10. The slot 20 can customize the cutters with corresponding symmetrical angles in the manufacturing process, has low processing cost and easy installation, has no limitation on the installation direction, can be assembled and disassembled in the opposite directions of the corresponding first fastener 140, and improves the installation convenience and the replaceability of the first fastener 140 in the use process. In a preferred embodiment, the shape of the second fastener 150 projected on the yoke surface 10 is at least one of rectangle, waist shape and ellipse, and the rectangle groove, waist shape groove and circular groove are more beneficial to the milling cutter to process than other irregular groove type or angular groove type, so as to facilitate the processing into corresponding shape on the magnetic field module, and reduce the processing cost of the magnetic steel module 110.

In this embodiment, one end of the first fastener 140 is disposed in the slot 20, the other end of the first fastener 140 protrudes out of the yoke surface 10 of the rotor house 130, after the first fastener 140 is assembled with the rotor house 130, the upper end protrudes out of the boss surface of the outer circle of the rotor house 130, and a guide groove for accommodating installation of the corresponding magnetic steel module 110 can be formed, so that accuracy of magnetic guiding of the magnetic inserting machine is ensured, specifically, the guide groove formed at two sides of the protruding rotor of the rib plate can be used for guiding installation of the substrate 401 of the magnetic steel module 110.

While specific embodiments of the utility model have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and the scope of the utility model is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the principles and spirit of the utility model, but such changes and modifications fall within the scope of the utility model.

Claims (10)

1. The rotor assembly comprises a rotor house and a magnetic steel module, and is characterized in that a magnet yoke surface of the rotor house is provided with a slot, the slot is positioned in the rotor house and is provided with an opening,

the rotor assembly further comprises a first fastener and a second fastener, wherein part of the first fastener is arranged in the slot, and the other part of the first fastener is exposed out of the magnetic yoke surface through the opening; the second fastener is connected to the first fastener and located above the magnetic yoke surface, and the second fastener is used for pressing the magnetic steel module onto the magnetic yoke surface.

2. The rotor assembly of claim 1 wherein the second fastener comprises a hold-down member having a through hole therein and a bolt passing through the through hole to hold down the second fastener to the yoke face.

3. The rotor assembly of claim 1 wherein the magnetic steel module comprises a base plate in contact with a yoke surface of the rotor house, wherein protrusions are provided at both ends of the base plate in a tangential direction of the yoke surface, and the protrusions abut against the first fastening member in an extending direction of the base plate.

4. A rotor assembly as claimed in claim 3, wherein the protrusions have a triangular cross-section in a direction perpendicular to the rotor house axis; or alternatively, the first and second heat exchangers may be,

the protrusions have an arc-shaped cross section in a direction perpendicular to the axial direction of the rotor house.

5. A rotor assembly as claimed in claim 3, wherein the projections at both ends of the base plate are symmetrically arranged about a central axis of the base plate.

6. A rotor assembly as claimed in claim 3 wherein the second fastener is adjacent an end face of the first fastener, a projection of the second fastener onto the yoke face overlies the first fastener, and a receiving cavity is formed between the second fastener and the yoke face to receive the projection.

7. The rotor assembly of claim 1 wherein the second fastener tapers in size in a direction away from the yoke face; and/or the number of the groups of groups,

the number of the slots is plural, and the plural slots are arranged in a direction of an outer circumference of the rotor house and extend in a direction parallel to an axis of the rotor house.

8. The rotor assembly of claim 1 wherein the shape of the second fastener projected on the yoke face is at least one of rectangular, kidney-shaped, oval.

9. The rotor assembly of claim 1 wherein a projection of the opening in a direction of the slot floor is located within the slot floor and the slot extends through the rotor house in an axial direction of the rotor house.

10. The rotor assembly of claim 1 wherein both ends of the slot have at least one of a triangular cross section or an arcuate cross section in a direction perpendicular to an axial direction of the rotor house; or alternatively, the first and second heat exchangers may be,

the cross section of the slot and the opening thereof in the direction vertical to the magnetic yoke surface is in a ladder shape.