阅读说明：本技术 电机 (Electric machine ) 是由 李军 毕刘新 邓仁杰 施黄璋 胡永路 徐刚 洪嘉维 赵俊志 于 2021-08-19 设计创作，主要内容包括：本发明涉及高速旋转设备,尤其是涉及一种电机。本发明提供的电机,包括转子、轴承、轴承座、壳体组件、基座和弹性件；转子具有相对的伸端和尾端,轴承套设在转子上靠近尾端处,轴承座与壳体组件配合,且与轴承靠近伸端一侧的端面抵接；基座与壳体组件配合,弹性件能够产生沿转子轴向的弹力,弹性件沿弹力方向具有相对的第一端和第二端,第一端与基座配合,第二端与轴承座配合；基座内设有发热件,基座能够受热产生沿弹性件的弹力方向的膨胀,且基座能够受冷产生与膨胀方向相反的回缩。能够在转子转动时,调节轴承与轴承座之间的预紧力。(The invention relates to high-speed rotating equipment, in particular to a motor. The invention provides a motor, which comprises a rotor, a bearing seat, a shell assembly, a base and an elastic piece, wherein the rotor is arranged on the bearing seat; the rotor is provided with an extending end and a tail end which are opposite, the bearing is sleeved on the rotor and is close to the tail end, and the bearing seat is matched with the shell assembly and is abutted against the end face of one side of the bearing, which is close to the extending end; the base is matched with the shell assembly, the elastic piece can generate elastic force along the axial direction of the rotor, the elastic piece is provided with a first end and a second end which are opposite along the elastic force direction, the first end is matched with the base, and the second end is matched with the bearing seat; be equipped with the piece that generates heat in the base, the base can be heated and produce the inflation along the elasticity direction of elastic component, and the base can be refrigerated and produce the shrink back opposite with the inflation direction. The pretightening force between the bearing and the bearing seat can be adjusted when the rotor rotates.)

1. A motor is characterized by comprising a rotor (1), a bearing (5), a bearing seat (4), a shell assembly (3), a base (10) and an elastic piece (9);

the rotor (1) is provided with an extending end and a tail end (6) which are opposite, the bearing (5) is sleeved on the rotor (1) and close to the tail end (6), and the bearing seat (4) is matched with the shell component (3) and is abutted against the end face of one side, close to the extending end, of the bearing (5);

the base (10) is matched with the shell assembly (3), the elastic piece (9) can generate elastic force along the axial direction of the rotor (1), the elastic piece (9) is provided with a first end and a second end which are opposite along the elastic force direction, the first end is matched with the base (10), and the second end is matched with the bearing seat (4);

be equipped with in base (10) and generate heat piece (11), base (10) can be heated and produce along the inflation of the elasticity direction of elastic component (9), just base (10) can be refrigerated and produce the shrink with the inflation direction opposite.

2. The electric machine according to claim 1, characterized in that a first mounting location is provided on the housing assembly (3), a second mounting location is provided on the bearing seat (4), the first mounting location and the second mounting location being opposite, the base (10) and the resilient member (9) being located between the first mounting location and the second mounting location.

3. The machine according to claim 2, characterized in that the first mounting location is a mounting slot (15) provided on the housing assembly (3), at least a portion of the base (10) being located within the mounting slot (15), and the second mounting location is a thrust surface (17) provided on the bearing seat (4), the resilient member (9) abutting the thrust surface (17).

4. The machine according to claim 2, wherein the base (10) comprises a base body (19) and a confinement ring (13), the heat generating element (11) is located in the base body (19), the base body (19) is matched with the first mounting position, the confinement ring (13) is sleeved on the base body (19), and the coefficient of thermal expansion of the confinement ring (13) is smaller than that of the base body (19).

5. The machine according to claim 4, characterized in that said containment rings (13) are at least two in number, a plurality of said containment rings (13) being arranged at intervals along the expansion direction of said base body (19).

6. The machine according to claim 3, characterised in that the mounting groove (15) comprises a first opening (16) opening onto the end face of the housing component (3) and a bottom end face (20) situated at the bottom of the groove of the mounting groove (15), the base (10) abutting against the bottom end face (20).

7. The machine according to claim 6, characterised in that the mounting groove (15) is conical in cross-section, the first opening (16) has an area dimension which is greater than the area dimension of the bottom end surface (20), and the clearance between the groove wall of the mounting groove (15) and the side end surface of the base (10) increases gradually in the direction from the bottom end surface (20) to the first opening (16).

8. The machine according to claim 3, characterized in that the mounting groove (15) is annular, the mounting groove (15) being arranged coaxially with the rotor (1); the base (10) is annular, and the base (10) and the mounting groove (15) are coaxially arranged.

9. The machine according to claim 8, characterized in that the resilient member (9) is a spring, the base (10) is provided with a plurality of positioning slots (14), the positioning slots (14) are arranged at intervals along the circumference of the rotor (1), and at least a portion of the spring near the first end is located in the positioning slot (14).

10. The electrical machine according to any of claims 1-9, wherein the housing assembly (3) comprises a housing (2) and an end cap (12), the end cap (12) being disposed within a first axial bore of the housing (2), the end cap (12) having a second axial bore; the bearing seat (4) comprises a seat body (18) and a baffle (8), the seat body (18) is embedded in a second shaft hole, the seat body (18) is provided with a third shaft hole used for penetrating through the rotor (1), the bearing (5) is sleeved on the rotor (1), the bearing (5) is embedded in the third shaft hole, the seat body (18) is provided with a blocking surface, the blocking surface is abutted to the end surface of one side, close to the extending end, of the bearing (5), and the baffle (8) is fixed with the seat body (18) through bolts; the base (10) is fitted with the end cap (12), and the second end is fitted with the baffle (8).

Technical Field

The invention relates to high-speed rotating equipment, in particular to a motor.

Background

The high-speed rotating equipment is more and more accepted by the market due to the advantages of high speed, direct drive and the like, and the supporting structure of the high-speed rotating equipment mainly comprises a magnetic suspension bearing, an air bearing, a rolling bearing and the like.

The rolling bearing used on the high-speed rotating equipment is generally a precision angular contact ball bearing, and the angular contact ball bearing needs to axially pre-tighten the bearing due to the structural characteristics of the angular contact ball bearing. The conventional pre-tightening scheme is positioning pre-tightening or constant-pressure pre-tightening, and the pre-tightening force of the two pre-tightening schemes can be changed along with the axial displacement of the pre-tightening structure.

When high-speed rotating equipment such as a motor runs, the heating value is high, the temperature of a rotor is far higher than that of a stator, the extending end of the motor is a positioning end, the tail end of the motor is a floating end, and the axial displacement of the rotor relative to the stator faces towards the tail end of the motor. The axial pretightening force of the motor in a cold state, a working state, a rated state and the like is different, and the angular contact ball bearing may have under-pretightening force or over-pretightening force, so that abnormal sound, heating or vibration of the bearing are caused to affect the service life of the bearing after long-term operation.

Disclosure of Invention

The invention aims to provide a motor which can adjust the pretightening force between a bearing and a bearing seat when a rotor rotates.

In one aspect, the invention provides a motor comprising a rotor, a bearing seat, a housing assembly, a base and an elastic member;

the rotor is provided with an extending end and a tail end which are opposite, the bearing is sleeved on the rotor and is close to the tail end, and the bearing seat is matched with the shell assembly and is abutted against the end face of one side of the bearing, which is close to the extending end;

the base is matched with the shell assembly, the elastic piece can generate elastic force along the axial direction of the rotor, the elastic piece is provided with a first end and a second end which are opposite along the elastic force direction, the first end is matched with the base, and the second end is matched with the bearing seat;

be equipped with the piece that generates heat in the base, the base can be heated and produce along the inflation of the elasticity direction of elastic component, just the base can be refrigerated and produce the shrink back opposite with the inflation direction.

Furthermore, be equipped with first installation position on the casing subassembly, be equipped with the second installation position on the bearing frame, first installation position with the second installation position sets up relatively, the base with the elastic component all is located between first installation position with the second installation position.

Further, the first installation position is an installation groove formed in the shell assembly, at least one part of the base is located in the installation groove, the second installation position is a thrust surface formed in the bearing seat, and the elastic piece is abutted to the thrust surface.

Further, the base comprises a base body and a restraining ring, the heating element is located in the base body, the base body is matched with the first installation position, the restraining ring is sleeved on the base body, and the thermal expansion coefficient of the restraining ring is smaller than that of the base body.

Further, the number of the restraint rings is at least two, and the restraint rings are arranged at intervals along the expansion direction of the base body.

Further, the mounting groove is including offering first opening on the casing subassembly terminal surface and being located the bottom terminal surface of the tank bottom of mounting groove, the base with bottom terminal surface butt.

Furthermore, the cross section of the mounting groove is in a cone shape, the area size of the first opening is larger than that of the bottom end face, and a gap between the groove wall of the mounting groove and the side end face of the base is gradually increased along the direction from the bottom end face to the first opening.

Further, the mounting groove is annular, and the mounting groove and the rotor are coaxially arranged; the base is annular, the base with the mounting groove coaxial setting.

Further, the elastic component is a spring, a plurality of positioning grooves are formed in the base, the positioning grooves are formed in the rotor at intervals in the circumferential direction, and at least one part, close to the first end, of the spring is located in the positioning grooves.

Further, the housing assembly includes a housing and an end cap disposed within the first axial bore of the housing, the end cap having a second axial bore; the bearing seat comprises a seat body and a baffle plate, the seat body is embedded in a second shaft hole, the seat body is provided with a third shaft hole used for penetrating through the rotor, the bearing is sleeved on the rotor, the bearing is embedded in the third shaft hole, the seat body is provided with a blocking surface, the blocking surface is abutted against the end surface of one side, close to the extending end, of the bearing, and the baffle plate is fixed with the seat body through bolts; the base is mated with the end cap, and the second end is mated with the baffle.

Has the advantages that:

the effect of elastic component in this scheme is through elasticity to provide the holding power to the bearing frame to make the bearing frame can produce axial thrust to the bearing, reach the pretightning force effect between bearing and the bearing frame. The elasticity of the elastic part is generated by the deformation of the elastic part, and the base is expanded by heat so as to push the elastic part to deform, thereby changing the elasticity of the elastic part. When the rotor expands due to heating to make the tail end generate axial displacement far from the side of the extending end, the bearing at the tail end is influenced by the displacement of the rotor, the rotor drives the bearing to move, the extrusion force of the bearing to the bearing seat is reduced or eliminated, the bearing seat is pushed by the elastic force of the elastic piece to move axially far away from the shell assembly, so that the bearing seat is always contacted with the bearing, the bearing seat is far away from the base, the distance between the bearing seat and the shell assembly as well as the base is increased, the compression deformation amount of the elastic piece is reduced, therefore, the elasticity of the elastic element is reduced, the base is heated under the action of the heating element 11 to expand, the expanded base extrudes the elastic element, the expansion size of the base is related to the displacement size of the bearing seat, so that the distance between the base and the bearing seat is restored to the original distance, thereby restoring the compression amount of the elastic member to the original size. The elasticity that the elastic component provided the bearing frame also recovers to original size, has guaranteed that the pretightning force between bearing frame and the bearing is unanimous before the rotor rotates.

Drawings

In order to more clearly illustrate 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 described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic structural diagram of an electric machine according to an embodiment of the present invention;

fig. 2 is a schematic partial structural diagram of an electric machine according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a base according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a mounting groove according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of an end cap according to an embodiment of the present invention.

Icon: 1-a rotor; 2-a housing; 3-a housing assembly; 4-bearing seats; 5-a bearing; 6-tail end; 7-a sensor; 8-a baffle plate; 9-an elastic member; 10-a base; 11-a heat generating member; 12-an end cap; 13-a confinement ring; 14-a positioning groove; 15-mounting grooves; 16-a first opening; 17-a thrust surface; 18-a seat body; 19-a base body; 20-bottom end face.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Examples

The motor according to fig. 1 to 5 comprises a rotor 1, a bearing 5, a bearing seat 4, a housing assembly 3, a base 10 and an elastic member 9;

the rotor 1 is provided with an extending end and a tail end 6 which are opposite, the bearing 5 is sleeved on the rotor 1 and is close to the tail end 6, and the bearing seat 4 is matched with the shell component 3 and is abutted against the end face of one side, close to the extending end, of the bearing 5;

the base 10 is matched with the shell component 3, the elastic piece 9 can generate elastic force along the axial direction of the rotor 1, the elastic piece 9 is provided with a first end and a second end which are opposite along the elastic force direction, the first end is matched with the base 10, and the second end is matched with the bearing block 4;

a heating element 11 is arranged in the base 10, the base 10 can be heated to expand along the elastic direction of the elastic element 9, and the base 10 can be cooled to retract opposite to the expansion direction.

When high-speed rotating equipment such as a motor runs, the heating value is large, the temperature of the rotor 1 is far higher than that of the stator, one end of the rotor 1 is an extending end, the other end of the rotor 1 is a tail end 6, the extending end is a positioning end, and the tail end 6 is a floating end, when the rotor 1 expands due to heating, the rotor 1 generates axial displacement relative to the shell assembly 3, and the axial displacement faces the direction of the tail end 6. Rotor 1 links to each other through bearing 5 between 2 with the shell of motor, and rotor 1 stretches end and tail end 6 and all links to each other with shell 2 through bearing 5, and bearing 5 has axial pretightning force when the installation between with bearing frame 4 to be in the state of supporting tightly between bearing 5 and the bearing frame 4, and bearing frame 4 produces the extrusion to bearing 5 along the direction of stretching end to tail end 6. When the rotor 1 is heated and expanded to enable the tail end 6 to generate axial displacement far away from one side of the extending end, the bearing 5 at the tail end 6 is influenced by the displacement of the rotor 1, the rotor 1 drives the bearing 5 to move towards one side far away from the extending end, the pretightening force between the bearing 5 and the bearing seat 4 is reduced, even a gap is generated between the bearing 5 and the bearing seat 4, so that the axial pretightening force of the bearing 5 is insufficient, and the bearing 5 generates abnormal sound or vibration due to looseness; when the pretightening force between the bearing 5 and the bearing seat 4 is too large, the bearing 5 generates too much heat, so that the service life of the bearing 5 is influenced.

Be equipped with base 10 and elastic component 9 between bearing frame 4 and the housing assembly 3 in this scheme, the effect of elastic component 9 is through elasticity to bearing frame 4 provides the holding power to make bearing frame 4 can produce axial thrust to bearing 5, reach bearing 5's pretension effect. The elastic force of the elastic member 9 is generated by the deformation of the elastic member 9, and the base 10 is expanded by heat to push the elastic member 9 to deform, thereby changing the elastic force.

The elastic piece 9 is positioned between the bearing seat 4 and the base 10, an initial distance exists between the base 10 and the bearing seat 4, the length of the elastic piece 9 after compression is the size of the initial distance, when the rotor 1 is heated and expanded to enable the tail end 6 to generate axial displacement far away from one side of the extending end, the bearing 5 at the tail end 6 is influenced by the displacement of the rotor 1, the rotor 1 drives the bearing 5 to move, the extrusion force of the bearing 5 to the bearing seat 4 is reduced or disappears, the bearing seat 4 is kept fixed due to the fact that the friction force between the bearing seat 4 and the shell component 3 cannot offset the elastic force of the elastic piece 9, the bearing seat 4 is pushed by the elastic force of the elastic piece 9 to generate movement in the direction far away from the shell component 3, the bearing seat 4 is in contact with the bearing 5 in the moving process, the bearing seat 4 is far away from the base 10, and the distance between the bearing seat 4 and the shell component 3 and the base 10 is increased all the time, the compression deformation amount of the elastic part 9 is reduced, so that the elastic force of the elastic part 9 is reduced, in order to avoid the situation, the influence of the heat generated by the motor according to the rotating speed of the rotor 1 on the expansion amount of the rotor 1 is obtained by detecting the rotating speed of the rotor 1 or the temperature of the rotor 1, the heating amount of the heating part 11 is obtained, at the moment, the base 10 is heated under the action of the heating part 11 to expand, the expanded base 10 extrudes the elastic part 9, the expansion size of the base 10 is related to the displacement size of the bearing seat 4, so that the distance between the base 10 and the bearing seat 4 is recovered to the initial distance, and the compression amount of the elastic part 9 is recovered to the initial size. The elasticity that elastic component 9 provided bearing frame 4 also recovers to original size, has guaranteed that the pretightning force between bearing frame 4 and the bearing 5 is unanimous before and after rotor 1 rotates.

Or when the rotor 1 is heated and expanded to enable the tail end 6 to generate axial displacement far away from one side of the extending end, the bearing 5 at the tail end 6 is influenced by the displacement of the rotor 1, the rotor 1 drives the bearing 5 to displace towards one side far away from the extending end, because the bearing 5 is embedded in the bearing seat 4, the bearing seat 4 is driven by the bearing 5 to move, the bearing seat 4 moves in the direction far away from the shell component 3 in the axial direction, the bearing seat 4 is far away from the base 10, the distance between the bearing seat 4 and the shell component 3 as well as between the bearing seat 4 and the base 10 is increased, the compression deformation quantity of the elastic part 9 is reduced, the elasticity of the elastic part 9 is reduced, the influence of the heat quantity generated according to the rotating speed of the rotor 1 on the expansion quantity of the rotor 1 is obtained by detecting the rotating speed of the rotor 1 or the temperature of the rotor 1, in order to compensate the elasticity of the elastic part 9, the base 10 is heated and expanded under the action of the heat quantity generated by the heat quantity of the heat generating part 11, the expanded base 10 presses the elastic member 9, and the expanded size of the base 10 is related to the displacement size of the bearing housing 4, so that the distance between the base 10 and the bearing housing 4 is restored to the original distance, and the compression amount of the elastic member 9 is restored to the original size.

When the rotating speed of the rotor 1 is reduced, the heat productivity of the rotor 1 is reduced, the expansion amount is reduced along with the reduction of the heat productivity, the tail end 6 of the rotor 1 drives the bearing 5 to move reversely or even reset, at the moment, the bearing 5 pushes the bearing seat 4 to move reversely, the influence of the heat productivity generated according to the rotating speed of the rotor 1 on the expansion amount of the rotor 1 is realized, the heating amount of the heating part 11 is obtained by detecting the rotating speed of the rotor 1 or the temperature of the rotor 1, the heating amount of the heating part 11 is reduced or even does not generate heat, the expansion amount of the base 10 is reduced or even completely recovered to the initial size, the compression amount is adjusted along with the change of the relative position between the base 10 and the bearing seat 4 by the elastic part 9, and the bearing 5 and the bearing seat 4 are always kept in a tight abutting state.

In an alternative embodiment, the housing assembly 3 is provided with a first mounting position, the bearing seat 4 is provided with a second mounting position, the first mounting position and the second mounting position are opposite, and the base 10 and the elastic member 9 are located between the first mounting position and the second mounting position.

The first installation position and the second installation position form a space for arranging the base 10 and the elastic element 9, the size of the space determines the size of the base 10 and the elastic element 9 after assembly, the elastic element 9 is arranged between the base 10 and the second installation position, and the size between the base 10 and the second installation position is the size of the elastic element 9 after compression.

In an alternative embodiment, the first mounting location is a mounting slot 15 provided on the housing assembly 3, at least a portion of the base 10 is located within the mounting slot 15, the second mounting location is a thrust surface 17 provided on the bearing seat 4, and the resilient member 9 abuts the thrust surface 17.

The base 10 is inserted in the mounting groove 15, relative displacement along the elastic direction of the elastic piece 9 can occur between the base 10 and the mounting groove 15, the mounting groove 15 generates constraint perpendicular to the elastic direction of the elastic piece 9 for the base 10, when the base 10 expands due to heating, the mounting groove 15 limits expansion of the base 10 along the elastic direction, so that expansion of the base 10 is completely performed along the elastic direction, and the effect that the base 10 extrudes the elastic piece 9 is improved.

The mounting groove 15 is provided with an opening on the end face of the housing assembly 3, the base 10 is inserted into the mounting groove 15, a part of the base extends out of the opening, or the base 10 is entirely positioned in the mounting groove 15, and the elastic member 9 extends out of the opening.

In an alternative embodiment, the base 10 includes a base body 19 and a confinement ring 13, the heat generating component 11 is located in the base body 19, the base body 19 is matched with the first installation site, the confinement ring 13 is sleeved on the base body 19, and a thermal expansion coefficient of the confinement ring 13 is smaller than that of the base body 19.

The function of the restriction ring 13 is to generate the restriction perpendicular to the elastic direction of the elastic member 9 on the base body 19, when the base body 19 expands due to heat, the restriction ring 13 generates the restriction on the expansion of the base body 19 along the direction perpendicular to the elastic direction, so that the expansion of the base body 19 is completely performed along the elastic direction, thereby improving the effect of the base body 19 on pressing the elastic member 9.

When the heating member 11 generates heat, because the thermal expansion coefficient of the restriction ring 13 is smaller than the body of the base body 19, the heating member 11 is located in the base body 19, the restriction ring 13 is sleeved outside the base body 19, the restriction ring 13 is far away from the heating member 11, therefore, the influence of the heating member 11 is smaller than the base body 19, when the base body 19 is heated and expanded, the restriction ring 13 restricts the base body 19, avoid the base body 19 from being expanded due to heating, thereby causing the slot wall of the mounting slot 15 to extrude, the extrusion between the slot walls of the base body 19 and the mounting slot 15 can cause the friction between the two to increase, thereby causing the expansion of the base body 19 along the elastic direction to be blocked.

In an alternative embodiment, the number of confinement rings 13 is at least two, and a plurality of confinement rings 13 are spaced apart along the expansion direction of the base body 19.

The restraint ring 13 is of a steel structure, the base body 19 is made of aluminum alloy, the heating part 11 is a resistance wire, the resistance wire is arranged in a casting blank before the base body 19 is cast and molded, the resistance wire is integrally cast and molded along with the base body 19, and the restraint ring 13 is sleeved outside the base body 19 after the base body 19 is machined.

The restraint rings 13 are sleeved outside the base body 19 at equal intervals, and the resistance wires are uniformly arranged in the base body 19 along the elastic direction.

In an alternative embodiment, the mounting groove 15 comprises a first opening 16 opening onto the end face of the housing component 3 and a bottom end face 20 at the bottom of the mounting groove 15, the base 10 abutting against the bottom end face 20.

The mounting groove 15 is provided with a first opening 16 on the end surface of the housing component 3, the base 10 is inserted into the mounting groove 15, a part of the base extends from the first opening 16, or the base 10 is entirely positioned in the mounting groove 15, and the elastic member 9 extends from the first opening 16.

The base 10 is located in the mounting groove 15 and abuts against the bottom end surface 20 of the mounting groove 15 through the elastic force of the elastic member 9, or the base 10 is connected with the bottom end surface 20 of the mounting groove 15. There is contact or a gap between the base 10 and the wall of the mounting groove 15.

In an alternative embodiment, the mounting groove 15 has a cone-shaped cross section, the area size of the first opening 16 is larger than the area size of the bottom end surface 20, and the gap between the groove wall of the mounting groove 15 and the side end surface of the base 10 is gradually increased along the direction from the bottom end surface 20 to the first opening 16.

The cross-section of mounting groove 15 is the oblique cone or just centrum, and at least one side cell wall of mounting groove 15 is along elasticity direction, keeps away from base 10 from bottom terminal surface 20 to first opening 16 gradually to avoid when base 10 is heated the inflation, the card can't expand along elasticity direction in mounting groove 15.

In an alternative embodiment, the mounting groove 15 is annular, and the mounting groove 15 is arranged coaxially with the rotor 1; the base 10 is annular, and the base 10 is coaxially arranged with the mounting groove 15.

The mounting groove 15 is arranged around the circumference of the rotor 1, the annular base 10 is also arranged around the circumference of the rotor 1 and is positioned in the mounting groove 15, and when the base 10 is heated, the base 10 expands along the axial direction. The first opening 16 and the bottom end surface 20 are also coaxially arranged ring surfaces, and the ring surface area of the first opening 16 is larger than that of the bottom end surface 20.

Or, the mounting grooves 15 are a plurality of hole structures arranged at intervals along the circumferential direction of the rotor 1, the base 10 is a column body matched with the hole structures, and the base 10 corresponds to the hole structures one by one. The hole structure is a cone, and the inner circle is processed to form a conical surface, so that the base 10 is prevented from being clamped in the groove after radial expansion.

In an alternative embodiment, the elastic member 9 is a spring, the base 10 is provided with a plurality of positioning slots 14, the positioning slots 14 are arranged at intervals along the circumferential direction of the rotor 1, and at least a part of the spring near the first end is located in the positioning slot 14.

Preferably, the positioning grooves 14 are equally spaced in the circumferential direction of the rotor 1 to ensure that the elastic force of the elastic member 9 uniformly acts on the bearing 5 in the circumferential direction of the rotor 1.

In an alternative embodiment, a thermal insulation layer is provided between the base 10 and the mounting groove 15.

The base body 19 is made of high-expansion coefficient materials such as aluminum alloy or aluminum-magnesium alloy, and the expansion coefficient of the base body is generally 2.5-3 times that of the rotor 1 material. To avoid heat losses and heat conduction to the housing component 3, the walls of the mounting groove 15 are provided with a thermally insulating layer, which may preferably be a self-adhesive aluminium foil.

In an alternative embodiment, the elastic member 9 is a spring, and the base 10 is provided with a positioning groove 14, and at least a portion of the spring near the first end is located in the positioning groove 14.

A section of the spring near the first end in the direction of the spring force is inserted into the positioning groove 14.

In an alternative embodiment, the housing assembly 3 includes the outer shell 2 and the end cap 12, the end cap 12 is disposed in a first axial hole of the outer shell 2, the end cap 12 is welded and fixed with the outer shell 2, the end cap 12 has a second axial hole; the bearing seat 4 comprises a seat body 18 and a baffle plate 8, the seat body 18 is embedded in the second shaft hole, the seat body 18 is provided with a third shaft hole for penetrating through the rotor 1, the bearing 5 is sleeved on the rotor 1, the bearing 5 is embedded in the third shaft hole, the seat body 18 is provided with a blocking surface, the blocking surface is abutted against the end surface of one side, close to the extending end, of the bearing 5, and the baffle plate 8 is fixed with the seat body 18 through bolts; base 10 is mated to end cap 12 and the second end is mated to baffle 8.

The bases 10 are arranged in the mounting grooves 15 on the end cover 12, or the bases 10 are arranged in the mounting grooves 15 on the end cover 12 at equal intervals in the circumferential direction of the rotor 1, and the elastic direction of the elastic members 9 is parallel to the axial direction of the rotor 1.

In order to obtain the relation between the rotating speed and the expansion amount, a prototype is tested, after the motor structure is determined, the heating and the heat dissipation are determined, and the average value is obtained through multiple tests, so that the axial displacement curve of the infrared probe measuring temperature and the rotor 1 relative to the stator, namely the shell assembly 3 can be obtained. And recording the relation between the rotating speed of the rotor 1 and the temperature of the infrared probe, so that the relation between the rotating speed of the rotor 1 and the expansion amount of the tail end 6 of the rotor 1 can be obtained. The test is carried out on a prototype, and the axial displacement of the base 10 under different currents of the heating part 11 and the current curve of the heating part 11 can be obtained by averaging the temperature of the bearing block 4 for a plurality of times after the temperature is stable. In the actual operation of the motor, the sensor 7 detects the rotation speed of the rotor 1 or the temperature of the rotor 1, and transmits related parameters to a controller, such as a PLC (programmable logic controller), and the controller converts the current of the heating element 11 to control a relay to supply power to the heating element 11.

Preferably, the sensor 7 is an infrared sensor, and the heating amount of the heating element 11 is obtained by detecting the rotation speed of the rotor 1 or the temperature of the rotor 1.

In the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases for those skilled in the art.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that the following embodiments are merely illustrative of the present invention, and not restrictive, and the scope of the present invention is not limited thereto: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.