CN215344143U - Motor rotor and motor - Google Patents

Abstract

The application provides a motor rotor and a motor. The motor rotor comprises a rotating shaft (1) and a permanent magnet (2), a mounting hole (3) is formed in the rotating shaft (1), the permanent magnet (2) is mounted in the mounting hole (3), a first stopping structure is arranged at the first end of the permanent magnet (2), and a second stopping structure is arranged at the second end of the permanent magnet (2). According to the motor rotor, the permanent magnet can be reduced or avoided from being interfered by the outside, and the permanent magnet is effectively protected.

Description

Motor rotor and motor

Technical Field

The application relates to the technical field of motor equipment, in particular to a motor rotor and a motor.

Background

The high speed motor suffers from very high centrifugal forces during operation due to the high rotational speed, which is a problem especially for permanent magnets, which must be protected because the sintered permanent magnet material cannot withstand the tensile stress generated by high speed rotation. One of the most common protective measures is to install an alloy sheath outside the permanent magnet body by heat, and the centrifugal force generated by high-speed rotation is counteracted by the compressive stress generated by interference so as to protect the permanent magnet. However, the structure of the rotor is simple, but the rotor has more general integrity and smaller height, and the rotating shaft is easy to bend and deform in abnormal impact.

In order to solve the problem, the prior art provides a high-speed motor hollow shaft rotor structure, which embeds permanent magnets in a hollow shaft, so that the integrity of the rotor is improved.

SUMMERY OF THE UTILITY MODEL

Therefore, the technical problem that this application will be solved lies in providing a motor rotor and motor, can reduce or avoid the permanent magnet to receive external disturbance, forms effective protection to the permanent magnet.

In order to solve the problem, the application provides a motor rotor, including pivot and permanent magnet, the mounting hole has been seted up in the pivot, and the permanent magnet is installed in the mounting hole, is provided with first backstop structure in the first end of permanent magnet, is provided with second backstop structure in the second end of permanent magnet.

Preferably, the mounting hole is opened at one end of the rotating shaft, the first stopping structure comprises a stopping surface at the tail end of the mounting hole, and the second stopping structure comprises a stopping part at one side of the permanent magnet far away from the stopping surface.

Preferably, the stop member is a baffle plate matched with the shape of the mounting hole, and the baffle plate is fixedly mounted in the mounting hole.

Preferably, the rotating shaft is provided with a first cooling hole, the permanent magnet is provided with a second cooling hole, the baffle is provided with a third cooling hole, and the first cooling hole, the second cooling hole and the third cooling hole penetrate through the baffle along the axial direction.

Preferably, the diameter of the second cooling hole is phi 3, and 2mm is less than or equal to phi 3 and less than or equal to 5 mm.

Preferably, the diameter φ 4 of the third cooling holes is larger than the diameter φ 3 of the second cooling holes.

Preferably, phi 4-phi 3 is less than or equal to 3mm and less than or equal to 5 mm.

Preferably, the diameter φ 2 of the first cooling holes is larger than the diameter φ 3 of the second cooling holes.

Preferably, phi 2-phi 3 is less than or equal to 3mm and less than or equal to 5 mm.

Preferably, the mounting hole includes a first hole section and a second hole section, the second hole section being located outside the first hole section, the permanent magnet and the stopper being mounted at the first hole section.

Preferably, the first bore section has a diameter φ 1 with a tolerance of (a, b) and the second bore section has a diameter φ 1 with a tolerance of (c, d), c > b.

Preferably, 0.5 mm. ltoreq. c-b. ltoreq.0.6 mm.

Preferably, a portion of the outer circumference of the rotating shaft corresponding to the permanent magnet is provided with a groove extending in the circumferential direction.

Preferably, the groove is a helical groove having an axial length greater than or equal to the axial length of the permanent magnet.

Preferably, the grooves are filled with a thermally conductive material.

Preferably, the rotating shaft is sleeved with a shielding layer.

Preferably, the shielding layer is a copper shielding layer, and the thickness of the copper shielding layer is 0.5 mm-1 mm.

According to another aspect of the present application, there is provided an electric machine comprising an electric machine rotor as described above.

The application provides a motor rotor, including pivot and permanent magnet, the mounting hole has been seted up in the pivot, and the permanent magnet is installed in the mounting hole, is provided with first backstop structure in the first end of permanent magnet, is provided with second backstop structure in the second end of permanent magnet. This electric motor rotor is provided with backstop structure respectively at the both ends of permanent magnet, and it is spacing to form good axial backstop to the permanent magnet on the one hand, prevents that the permanent magnet from deviating from in the pivot, improves permanent magnet mounting structure's stability, and on the other hand can utilize backstop structure to form the protection to the permanent magnet, avoids the permanent magnet to expose and receives external disturbance and damage.

Drawings

FIG. 1 is a cross-sectional structural schematic view of a rotor of an electric machine according to an embodiment of the present application;

FIG. 2 is a cross-sectional structural view of a rotating shaft of a rotor of an electric machine according to an embodiment of the present application;

FIG. 3 is a cross-sectional structural view of a permanent magnet of a rotor of an electric machine according to an embodiment of the present application;

FIG. 4 is a cross-sectional block diagram of a stop of a rotor of an electric machine according to an embodiment of the present application;

fig. 5 is a sectional structural view of a motor according to an embodiment of the present application.

The reference numerals are represented as:

1. a rotating shaft; 2. a permanent magnet; 3. mounting holes; 4. a stop surface; 5. a stopper; 6. a first cooling hole; 7. a second cooling hole; 8. a third cooling hole; 9. a first bore section; 10. a second bore section; 11. a helical groove; 12. a shielding layer; 13. a stator; 14. a housing; 15. a front end cover; 16. a rear end cap; 17. and a bearing.

Detailed Description

With reference to fig. 1 to 5, according to an embodiment of the present application, a motor rotor includes a rotating shaft 1 and a permanent magnet 2, a mounting hole 3 is opened in the rotating shaft 1, the permanent magnet 2 is installed in the mounting hole 3, a first stopping structure is disposed at a first end of the permanent magnet 2, and a second stopping structure is disposed at a second end of the permanent magnet 2.

This electric motor rotor is provided with backstop structure respectively at the both ends of permanent magnet 2, can form good axial backstop spacing to permanent magnet 2 on the one hand, prevents that permanent magnet 2 from deviating from in pivot 1, improves the stability of permanent magnet 2 mounting structure, prevents that permanent magnet 2 from taking place the axial float, and on the other hand can utilize backstop structure to form the protection to permanent magnet 2, avoids permanent magnet 2 to expose and receives external disturbance and damage.

In one embodiment, the mounting hole 3 is opened at one end of the rotating shaft 1, the first stopping structure comprises a stopping surface 4 at the end of the mounting hole 3, and the second stopping structure comprises a stopping part 5 at one side of the permanent magnet 2 far away from the stopping surface 4. In this embodiment, because the mounting hole 3 is seted up in the one end of pivot 1, does not run through pivot 1 along the axial, consequently can utilize the backstop face 4 of pivot 1 self to form the backstop structure that carries out the axial backstop to permanent magnet 2, simple structure, simple to operate, manufacturing procedure still less moreover, the processingquantity is littleer, and the processing cost is lower. Set up the stopper 5 in the opening side of mounting hole 3, can install into mounting hole 3 at permanent magnet 2 after, it is spacing to carry out the axial to permanent magnet 2 to install stopper 5 again, conveniently realizes the installation of permanent magnet 2.

In this embodiment, mounting hole 3 sets up the one end of stretching the end at pivot 1 keeping away from the axle to make pivot 1 as the one end that the axle stretched the end, structural strength is higher, conveniently designs the axle and stretches end structure, realizes being connected with other parts, perhaps hangs other parts.

In one embodiment, the stop 5 is a baffle plate adapted to the shape of the mounting hole 3, and the baffle plate is fixedly mounted in the mounting hole 3. In this embodiment, adopt the baffle as stop part 5, its structure and mounting hole 3's shape looks adaptation, not only the structure is easily processed, save material, conveniently cooperates with mounting hole 3, and can effectively shelter from the guard action to permanent magnet 2 formation. The permanent magnet 2 and the baffle are in interference fit with the mounting hole 3.

In one embodiment, the rotating shaft 1 is provided with a first cooling hole 6, the permanent magnet 2 is provided with a second cooling hole 7, the baffle is provided with a third cooling hole 8, the first cooling hole 6, the second cooling hole 7 and the third cooling hole 8 axially penetrate through the baffle, and an axial through hole can be formed in the central part of the motor rotor and used for ventilating and cooling the permanent magnet 2, so that ventilation and heat dissipation of the permanent magnet 2 are facilitated.

In one embodiment, the diameter of the second cooling holes 7 is φ 3, 2mm ≦ φ 3 ≦ 5 mm. The reason why 2mm or more and 5mm or less is restricted is that if Φ 3 is particularly small, the amount of heat exchange fluid that can flow through the interior of the permanent magnet 2 is small, reducing the cooling effect, and if Φ 3 is particularly large, magnetic flux is easily leaked through the interior of the permanent magnet 2, so that the magnetic performance cannot be exerted, and therefore it is reasonable to restrict 2mm or more and Φ 3 or more and 5mm or less.

In one embodiment, the diameter φ 4 of the third cooling holes 8 is larger than the diameter φ 3 of the second cooling holes 7. By means of the structure, the characteristic that the diameter of the third cooling hole 8 and the diameter of the second cooling hole 7 are large can be utilized, so that part of the end face of the permanent magnet 2 is exposed outside, real-time monitoring on the temperature of the permanent magnet 2 is achieved conveniently by means of temperature measuring tools such as a temperature measuring gun, and the temperature monitoring device is very convenient and fast.

As a preferred embodiment, 3 mm.ltoreq.PHI.4-PHI.3.ltoreq.5 mm. The reason why phi 4-phi 3 are not less than 3mm and not more than 5mm is that if phi 4 is more than phi 3, the area of the end face of the permanent magnet 2 which is not compacted is larger, which is not beneficial to protecting the permanent magnet 2 axially; and if phi 4 is less than phi 3, the area of the end face of the permanent magnet 2 exposed in the air is very small, which is not favorable for the test of irradiating the end part of the permanent magnet 2 by using a temperature measuring gun.

In one embodiment, the diameter φ 2 of the first cooling holes 6 is greater than the diameter φ 3 of the second cooling holes 7.

As a preferred embodiment, 3 mm. ltoreq. phi 2-phi 3. ltoreq.5 mm. The relationship definition of Φ 2- Φ 3 works the same as the relationship definition of Φ 4- Φ 3.

In one embodiment, the mounting hole 3 comprises a first hole section 9 and a second hole section 10, the second hole section 10 is located outside the first hole section 9, the permanent magnet 2 and the stopper 5 are mounted in the first hole section 9, the diameter of the second hole section 10 is larger than the diameter of the first hole section 9, or the diameter of the second hole section 10 is the same as the diameter of the first hole section 9, and the tolerance band of the second hole section 10 is larger than the tolerance band of the first hole section 9. The aperture size of the second hole section 10 is larger than that of the first hole section 9, so that the difficulty in assembling the permanent magnet 2 and the baffle plate can be reduced, and the installation convenience is improved.

In one embodiment, the first bore section 9 has a diameter φ 1 with a tolerance of (a, b), and the second bore section 10 has a diameter φ 1 with a tolerance of (c, d), c > b.

As a preferred embodiment, 0.5 mm. ltoreq. c-b. ltoreq.0.6 mm. The c-b is mainly limited to be convenient to assemble, because the axial distance of the hollow inside the rotating shaft is long, the area of the rotating shaft in interference fit with the permanent magnet 2 is only a small section, the other areas have no fit relation, no over-processing is needed, and the size can be preferably enlarged, so that the permanent magnet 2 cannot be clamped in the assembling process, if the tolerance of the partial area is kept the same as that of the section matched with the permanent magnet 2, one is increased in processing cost, the other is easy to cause that the permanent magnet 2 is not assembled in place after the short shaft is cooled down, the permanent magnet 2 is clamped in the middle position, and the enlargement of the size is beneficial to reducing the risk of assembly failure.

In one embodiment, the part of the outer circumference of the rotating shaft 1 corresponding to the permanent magnet 2 is provided with a groove extending along the circumferential direction, so that the surface structure of the rotating shaft 1 can be optimized, and the eddy current loss of the motor rotor is reduced. The groove can only extend along the circumferential direction of the rotating shaft 1 to form an annular groove or an arc-shaped groove, and can also extend along the circumferential direction and the axial direction of the rotating shaft 1 to form a spiral groove.

Preferably, the groove is a helical groove 11, the axial length of the helical groove 11 being greater than or equal to the axial length of the permanent magnet 2.

In one embodiment, the groove is filled with a heat conducting material, for example, the heat conducting material is heat conducting glue, so that the heat dissipation effect of the motor rotor can be improved, and the structural strength of the rotating shaft 1 can be improved.

In one embodiment, the shielding layer 12 is sleeved outside the rotating shaft 1, so that higher harmonics can be shielded, the effect is remarkable, and the heat generation of the permanent magnet 2 can be reduced.

Preferably, the shielding layer 12 is a copper shielding layer, and the thickness of the copper shielding layer is 0.5mm to 1 mm. The thickness of the shielding layer 12 is preferably 0.5mm to 1mm, and too small a thickness does not have a shielding effect, and too large a thickness increases eddy current loss generated by itself, thereby having a reaction.

During assembly, the hollow rotating shaft 1 needs to be heated to a proper temperature, then the permanent magnet 2 and the baffle plate are rapidly installed in sequence, after the rotating shaft 1 is completely cooled, the shielding layer 12 is sleeved in, and two sides of the shielding layer are fixedly connected with the rotating shaft 1 in a welding mode. The assembly method of the rest parts is more conventional and is not detailed here.

In the motor rotor structure, the rotating shaft 1 is a hollow shaft and is not segmented, so that the problem of insufficient rigidity is solved; meanwhile, the permanent magnet 2 is directly embedded in the hollow shaft, so that an alloy sheath or a carbon fiber sheath is omitted, and the cost is greatly saved; moreover, the hollow part in the hollow shaft is divided into two sections, one section of hollow area is small in diameter, the shaft extension end structure is convenient to design, one end of the permanent magnet 2 is convenient to axially position, the permanent magnet 2 is prevented from being damaged along the axial direction, and the other section of hollow area is large in diameter, so that the permanent magnet 2 and the baffle are convenient to directly embed; on the other hand, the spiral groove 11 is formed in the outer circle of the hollow shaft, so that the eddy current loss of the rotor is reduced, and the spiral groove 11 is filled with heat-conducting glue, so that the structural strength is enhanced, and the heat dissipation effect can be improved. And finally, a hollow copper shielding layer is continuously sleeved outside the hollow shaft, so that higher harmonics penetrating into the permanent magnet 2 are effectively shielded, the eddy current loss of the permanent magnet 2 is further reduced, and the heating of the permanent magnet 2 is controlled at an extremely low level. In addition, the center of the permanent magnet 2 is provided with a small through hole which can be used for ventilation cooling, and two end faces are directly exposed outside, so that a temperature measuring gun can be adopted to directly measure temperature in real time, and the device is very simple and convenient.

According to an embodiment of the application, the electric machine comprises an electric machine rotor, which is the electric machine rotor described above.

The motor also comprises a stator 13, a machine shell 14, a front end cover 15, a rear end cover 16 and a bearing 17, wherein the stator 13 is fixedly arranged in the machine shell 14, a motor rotor is arranged in the stator 13, and two ends of the motor rotor are rotatably arranged in the front end cover 15 and the rear end cover 16 through the bearing 17.

It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.

The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed. The foregoing is only a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present application, and these modifications and variations should also be considered as the protection scope of the present application.

Claims (18)

1. The utility model provides an electric motor rotor, its characterized in that, includes pivot (1) and permanent magnet (2), mounting hole (3) have been seted up in pivot (1), install permanent magnet (2) in mounting hole (3) the first end of permanent magnet (2) is provided with first backstop structure the second end of permanent magnet (2) is provided with second backstop structure.

2. An electric machine rotor according to claim 1, characterised in that the mounting hole (3) opens at one end of the shaft (1), that the first stop structure comprises a stop surface (4) at the end of the mounting hole (3), and that the second stop structure comprises a stop (5) at the side of the permanent magnet (2) facing away from the stop surface (4).

3. An electric machine rotor according to claim 2, characterized in that the stop (5) is a baffle adapted to the shape of the mounting hole (3), the baffle being fixedly mounted in the mounting hole (3).

4. The electric machine rotor according to claim 3, characterized in that the rotating shaft (1) is provided with a first cooling hole (6), the permanent magnet (2) is provided with a second cooling hole (7), the baffle is provided with a third cooling hole (8), and the first cooling hole (6), the second cooling hole (7) and the third cooling hole (8) axially penetrate through.

5. An electric machine rotor according to claim 4, characterised in that the diameter of the second cooling holes (7) is φ 3, 2mm ≦ φ 3 ≦ 5 mm.

6. An electric machine rotor according to claim 4, characterised in that the diameter φ 4 of the third cooling holes (8) is larger than the diameter φ 3 of the second cooling holes (7).

7. An electric machine rotor as claimed in claim 6, characterized in that 3mm Φ 4- Φ 3 ≤ 5 mm.

8. An electric machine rotor according to claim 4, characterised in that the diameter φ 2 of the first cooling holes (6) is larger than the diameter φ 3 of the second cooling holes (7).

9. The electric machine rotor of claim 8, characterized in that 3mm Φ 2- Φ 3 ≤ 5 mm.

10. An electric machine rotor according to claim 2, characterized in that the mounting hole (3) comprises a first hole section (9) and a second hole section (10), the second hole section (10) being located outside the first hole section (9), the permanent magnet (2) and the stop (5) being mounted in the first hole section (9).

11. An electric machine rotor according to claim 10, characterised in that the diameter of the first hole section (9) is Φ 1 with a tolerance (a, b) and the diameter of the second hole section (10) is Φ 1 with a tolerance (c, d), c > b.

12. An electric machine rotor as claimed in claim 11, characterised in that 0.5mm ≦ c-b ≦ 0.6 mm.

13. An electric machine rotor according to claim 1, characterized in that the part of the outer circumference of the rotating shaft (1) corresponding to the permanent magnets (2) is provided with a groove extending in the circumferential direction.

14. An electric machine rotor, according to claim 13, characterised in that said groove is a helical groove (11), the axial length of said helical groove (11) being greater than or equal to the axial length of said permanent magnet (2).

15. An electric machine rotor as claimed in claim 13, wherein the grooves are filled with a thermally conductive material.

16. An electric machine rotor according to claim 1, characterised in that the shaft (1) is provided with a shielding (12) around it.

17. An electric machine rotor according to claim 16, characterized in that the shield layer (12) is a copper shield layer having a thickness of 0.5mm to 1 mm.

18. An electrical machine comprising an electrical machine rotor, characterized in that the electrical machine rotor is an electrical machine rotor according to any one of claims 1 to 17.

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