Permanent magnet motor rotor and permanent magnet motor

Abstract

The utility model provides a permanent magnet motor rotor and a permanent magnet motor, relates to the technical field of rotors, and aims to solve the technical problems that in the prior art, a rotor shell is heavy and low in strength, a motor rotor is not ideal in heat dissipation effect, and long-term stable operation of the permanent magnet motor is not facilitated, the device comprises a shell, a cover body, a sheath and a plurality of magnetic steels, a through hole is formed in the center of the shell and used for containing the mandrel, the two end faces of the shell are sunken towards the interior of the shell to form annular grooves, and a plurality of ventilation holes are formed in the annular grooves. The two cover bodies are arranged at the two ends of the shell respectively. The sheath is arranged on the outer side of the shell, and an annular accommodating structure is formed among the shell, the two cover bodies and the sheath; the plurality of magnetic steels are arranged in the accommodating structure. The weight of the rotor housing can be reduced, the rotational inertia is reduced, the ventilation effect is good, and the permanent magnet motor can operate stably for a long time.

Description

Technical Field

[0001] The utility model relates to the technical field of rotors, in particular to a permanent magnet motor rotor and a permanent magnet motor. Background Art

[0002] Permanent magnet motors have high torque density and high efficiency and have been widely used in the fields of medical devices, household appliances, electric vehicles, wind power generation, and aerospace.

[0003] A permanent magnet motor includes two parts: a rotor and a stator. Among them, the rotor is the main moving part of the permanent magnet motor, including a housing, a permanent magnet, and an iron core. The housing is the external protection structure of the rotor, usually made of a metal material, which can effectively protect the internal components. The functions of the permanent magnet and the iron core are to generate a magnetic field and interact with the stator to generate a rotational force; the stator is the stationary part of the permanent magnet motor, usually composed of a winding iron core, and the function of the stator is to interact with the rotor magnetic field to generate an electromotive force.

[0004] The applicant of the present invention has found that the prior art has at least the following technical problems:

[0005] At present, the housing of the permanent magnet motor rotor generally adopts a columnar structure made of steel. In order to make it have good assembly and ventilation effects, multiple groups of protrusions and grooves are generally provided on the surface or inside of the housing, resulting in a relatively complex, heavy and low-strength overall structure of the housing, an unsatisfactory heat dissipation effect of the motor rotor, and being not conducive to the long-term stable operation of the permanent magnet motor. Summary of the Utility Model

[0006] The purpose of the present invention is to provide a permanent magnet motor rotor and a permanent magnet motor to solve the technical problem existing in the prior art that the housing of the current permanent magnet motor rotor generally adopts a columnar structure made of steel. In order to make it have good assembly and ventilation effects, multiple groups of protrusions and grooves are generally provided on the surface or inside of the housing, resulting in a relatively complex, heavy and low-strength overall structure of the housing, but an unsatisfactory heat dissipation effect and being not conducive to the long-term stable operation of the permanent magnet motor. The preferred technical solutions provided by the present invention can produce many technical effects as described below.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A permanent magnet motor rotor provided by the present invention includes:

[0009] A housing, a through hole is provided at the center of the housing, the through hole is used to accommodate a mandrel, both end faces of the housing are recessed inward to form annular grooves, and a plurality of ventilation holes are provided in the annular grooves;

[0010] Two covers, respectively arranged at both ends of the housing;

[0011] A sheath is disposed on the outer side of the housing, and an annular accommodation structure is formed between the housing, the two cover bodies and the sheath;

[0012] A plurality of magnetic steel are disposed in the accommodation structure.

[0013] Preferably, the through hole is a tapered hole.

[0014] Preferably, a plurality of the ventilation holes are uniformly distributed along the circumferential direction of the annular groove.

[0015] Preferably, the ventilation hole includes a crescent-shaped hole.

[0016] Preferably, the magnetic steel adopts a strip block structure, including a first surface and a second surface arranged oppositely, wherein:

[0017] Both the first surface and the second surface include arc structures, the arc structures of the first surface and the second surface have the same diameter but different centers, and the diameter of the arc structure is the same as the nominal diameter of the housing.

[0018] Preferably, a gap is provided between every two adjacent magnetic steels.

[0019] Preferably, the cover body and the housing are positioned by a rabbet.

[0020] Preferably, the permanent magnet motor rotor further includes a connecting member, a plurality of first connection hole positions are further provided on the housing, the first connection hole positions are arranged on the outer circumference of the annular groove and the first connection hole positions are uniformly distributed, a plurality of second connection hole positions corresponding to the first connection hole positions one by one are provided on the cover body, and the connecting member connects the housing and the cover body through the first connection hole positions and the second connection hole positions.

[0021] Preferably, the housing, the connecting member and the cover body are all made of aluminum material.

[0022] A permanent magnet motor includes the above-mentioned permanent magnet motor rotor.

[0023] A permanent magnet motor rotor and a permanent magnet motor provided by the present utility model. The permanent magnet motor rotor includes a housing, a cover body, a sheath and a plurality of magnetic steel. A through hole is provided in the center of the housing, and the through hole is used to accommodate a core shaft. Annular grooves are formed by recessing both end faces of the housing inwardly into the housing, achieving the effect of reducing the weight of the housing. And a plurality of ventilation holes are provided in the annular grooves. On the one hand, the ventilation holes enable the permanent magnet motor rotor to have a good ventilation and heat dissipation effect, which is beneficial to improving the service life of the permanent magnet motor rotor. On the other hand, the ventilation holes play a good role in weight reduction, can reduce the moment of inertia, and improve the use effect of the permanent magnet motor rotor. The cover body includes two parts respectively arranged at both ends of the housing, and the sheath is arranged on the outside of the housing. An annular accommodation structure is formed between the housing, the two cover bodies and the sheath, and a plurality of magnetic steel are arranged in the accommodation structure. The sheath plays an effective protective role for the magnetic steel inside it and the structure inside the housing. The permanent magnet motor is made more lightweight by setting the above-mentioned permanent magnet motor rotor, reduces the moment of inertia, has good ventilation effect, and can operate stably for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0025] Figure 1 is a schematic structural diagram of an embodiment of the permanent magnet motor rotor of the present utility model;

[0026] Figure 2 is Figure 1 the exploded structural diagram of;

[0027] Figure 3 is Figure 1 the structural diagram from another angle;

[0028] Figure 4 is Figure 1 the front view structural diagram of;

[0029] Figure 5 is Figure 4 the sectional structural diagram of A-A in;

[0030] Figure 6 is a schematic structural diagram of the housing of an embodiment of the permanent magnet motor rotor of the present utility model;

[0031] Figure 7 is Figure 6 the front view structural diagram of;

[0032] Figure 8 is Figure 7Schematic diagram of the B-B sectional structure

[0033] In the figure: 1. Outer shell; 10. Through hole; 11. Ring groove; 12. Ventilation hole; 121. First side; 122. Second side; 13. First connection hole position; 14. Slot hole; 2. Cover body; 21. Second connection hole position; 3. Sheath; 4. Magnet; 41. First surface; 42. Second surface; 5. Connector Specific implementation mode

[0034] In order to make the purpose, technical solution and advantages of the present utility model clearer, the technical solution of the present utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other implementation manners obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative work belong to the scope protected by the present utility model

[0035] In the description of the present utility model, it should be understood that the terms "center", "lateral", "length", "width", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "side", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model

[0036] In the description of the present utility model, it should also be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations

[0037] Embodiment 1

[0038] Figure 1 is the structural schematic diagram of this embodiment Figure 2 is Figure 1 the exploded structural schematic diagram of Figure 1 and Figure 2 As shown, this embodiment provides a permanent magnet motor rotor, including an outer shell 1, a cover body 2, a sheath 3 and a magnet 4, wherein a plurality of magnets 4 are provided

[0039] Specifically, a through hole 10 is provided at the center of the outer shell 1, and the through hole 10 is used to accommodate the mandrel. Optionally, the through hole 10 is a tapered hole, and the tapered hole is more conducive to the connection and positioning of the outer shell 1 and the mandrel. The mandrel can be the crankshaft of the engine. By setting the through hole 10 as a tapered hole, the concentricity can be more ensured.

[0040] To make the outer shell 1 lightweight and reduce the moment of inertia of the permanent magnet motor rotor, the outer shell 1 in this embodiment is made of aluminum alloy material. And by providing annular grooves 11 formed by recessing towards the inside of the outer shell 1 on both end faces of the outer shell 1, the effect of reducing the weight of the outer shell 1 is further achieved.

[0041] In this embodiment, a plurality of ventilation holes 12 are provided in the annular groove 11. By providing a plurality of ventilation holes 12 in the annular groove 11, on the one hand, the ventilation holes 12 enable the permanent magnet motor rotor to have a good self-ventilation and heat dissipation effect, which is beneficial to improving the service life of the permanent magnet motor rotor. On the other hand, the ventilation holes 12 play a good role in weight reduction, can reduce the moment of inertia, and improve the use effect of the permanent magnet motor rotor.

[0042] Figure 3 Yes Figure 1 Schematic structural diagram from another angle, Figure 4 Yes Figure 1 Front view structural diagram of Figure 5 Yes Figure 4 Cross-sectional structural diagram of Figures 3 - 5 As shown, there are two cover bodies 2, and the structures of the two cover bodies 2 are the same, and they are respectively arranged at both ends of the outer shell 1. In this embodiment, to further reduce the weight of the permanent magnet motor rotor and make the permanent magnet motor rotor and the permanent magnet motor as a whole lightweight, the cover body 2 is made of aluminum material.

[0043] Optionally, in this embodiment, the cover body 2 and the outer shell 1 are positioned by a rabbet, which can ensure the concentricity of the cover body 2 and the outer shell 1, reduce the unbalance amount, improve the stability during the use of the permanent magnet motor rotor and the permanent magnet motor, and extend the service life of the permanent magnet motor rotor and the permanent magnet motor.

[0044] The sheath 3 is arranged on the outside of the outer shell 1. Optionally, the length dimension of the sheath 3 does not exceed the distance between the two end faces on the cover bodies that are farther apart. In this embodiment, an annular accommodating structure is formed among the outer shell 1, the two cover bodies 2 and the sheath 3, and a plurality of magnetic steel 4 are arranged in the accommodating structure. By sleeving the sheath 3 on the outside of the outer shell 1 and arranging the magnetic steel 4 between the sheath 3 and the outer shell 1, the sheath 3 plays an effective protective role for the magnetic steel 4 inside it and the structure inside the outer shell 1.

[0045] As an alternative implementation manner, Figure 6 Schematic structural diagram of the outer shell in this embodiment, Figure 7 Yes Figure 6 Front view structural diagram ofFigure 8 is Figure 7 the schematic cross-sectional structure view along B-B in the figure, as Figures 6 - 8 shown, a plurality of ventilation holes 12 are evenly distributed along the circumferential direction of the annular groove 11. By arranging the plurality of ventilation holes 12 evenly, it is beneficial to improve the uniformity of heat dissipation, avoid the problem of local overheating, and is beneficial to improve the service life of the permanent magnet motor rotor.

[0046] Specifically, the ventilation hole 12 in this embodiment includes a crescent-shaped hole. Both the first side 121 and the second side 122 of the crescent-shaped hole are arc-shaped structures, which are more conducive to processing. By setting the crescent-shaped ventilation hole 12, while ensuring the structural strength, the weight is significantly reduced, the moment of inertia is reduced, and at the same time, it has a good ventilation effect.

[0047] Of course, in actual production and use, the ventilation hole 12 can also be set as an ordinary circular hole, or a rounded rectangular hole with both the first side 121 and the second side 122 being straight lines, or other regular or irregular shaped hole structures can also be adopted.

[0048] It should be noted that the ventilation effect of the circular hole is not as good as that of the crescent-shaped hole, and the rounded rectangular hole is not as conducive to processing as the crescent-shaped hole. Therefore, the crescent-shaped hole is the preferred structure of the ventilation hole 12 in this embodiment. However, in actual production and use, the specific structure of the ventilation hole can also be selected according to actual production and use needs.

[0049] As an alternative implementation manner, as Figure 2 shown, the magnetic steel 4 adopts a strip-shaped block structure, including a first surface 41 and a second surface 42 arranged oppositely.

[0050] Among them, both the first surface 41 and the second surface 42 include arc structures. The arc structures of the first surface 41 and the second surface 42 have the same diameter but different centers, and the diameter of the arc structure is the same as the nominal diameter of the outer shell 1, so as to facilitate the magnetic steel 4 to cooperate well with the outer shell 1. Specifically, in this embodiment, a gap is provided between every two adjacent magnetic steels 4, which is beneficial for filling and assembling.

[0051] In this embodiment, the first surface 41 of the magnetic steel 4, that is, the inner arc, is the same as the nominal diameter of the outer shell 1, and the magnetic steel 4 and the outer shell 1 adopt a clearance fit. The second surface 42 of the magnetic steel 4, that is, the outer arc, cooperates with the outer sheath 3 around it. The outer sheath 3 is set to be in line contact with the maximum outer diameter of the outer arc. After the magnetic steel is potted, it has an interference fit with the outer sheath 3.

[0052] As an alternative implementation manner, the permanent magnet motor rotor further includes a connecting member 5. A plurality of first connection hole positions 13 are also provided on the outer shell 1. The first connection hole positions 13 are arranged on the outer circumference of the annular groove 11 and the first connection hole positions 13 are evenly distributed, so that the force is more uniform during connection and the connection stability is better.

[0053] A plurality of second connection hole positions 21 corresponding to the first connection hole positions 13 one by one are provided on the cover body 2, and the connecting member 5 connects the housing 1 and the cover body 2 through the first connection hole positions 13 and the second connection hole positions 21.

[0054] In this embodiment, the connecting member 5 is a screw, preferably a lightweight aluminum alloy screw, to reduce the weight of the overall structure. The number of the connecting members 5 is the same as the number of the first connection hole positions 13 and the second connection hole positions 21, so as to facilitate the one-to-one corresponding connection.

[0055] As an alternative embodiment, as Figure 2 and Figure 3 shown, a plurality of slot holes 14 are provided on one end face of the housing 1. The slot holes 14 are arranged in the annular groove 11 and are arranged circumferentially of the through hole 10 between the through hole 10 and the ventilation hole 12. On the one hand, the slot holes 14 have a good weight reduction effect, making the housing 1 lighter; on the other hand, since the housing 1 is connected to the mandrel with a taper, the connection tightness is better, and when disassembling, the housing 1 and the mandrel can be separated by a tool against the slot holes 14.

[0056] Embodiment Two

[0057] This embodiment provides a permanent magnet motor, including the permanent magnet motor rotor in Embodiment One. The permanent magnet motor rotor includes a housing 1, a cover body 2, a sheath 3 and a plurality of magnetic steel 4. A through hole 10 is provided at the center of the housing 1, and the through hole 10 is used to accommodate the mandrel. Annular grooves 11 are recessed inward from both end faces of the housing 1 to achieve the effect of reducing the weight of the housing 1, and a plurality of ventilation holes 12 are provided in the annular grooves 11. On the one hand, the ventilation holes 12 enable the permanent magnet motor rotor to have a good ventilation and heat dissipation effect, which is beneficial to improving the service life of the permanent magnet motor rotor; on the other hand, the ventilation holes 12 have a good weight reduction effect, which can reduce the moment of inertia and improve the use effect of the permanent magnet motor rotor. The cover body 2 includes two, which are respectively arranged at both ends of the housing 1. The sheath 3 is arranged outside the housing 1. An annular accommodating structure is formed among the housing 1, the two cover bodies 2 and the sheath 3. A plurality of magnetic steel 4 are arranged in the accommodating structure, and the sheath 3 plays an effective protective role for the magnetic steel 4 inside it and the structure inside the housing 1. The permanent magnet motor is made lighter by setting the permanent magnet motor rotor, reduces the moment of inertia, has a good ventilation effect, and can operate stably for a long time.

[0058] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A permanent magnet motor rotor, characterized in that: include: A shell, wherein a through hole is provided at the center of the shell, and the through hole is used to accommodate the core shaft. Both end surfaces of the shell are recessed toward the inside of the shell to form an annular groove, and a plurality of ventilation holes are provided in the annular groove; The cover body comprises two covers, which are respectively arranged at two ends of the shell; A sheath is arranged on the outer side of the shell, and an annular accommodating structure is formed between the shell, the two covers and the sheath; A plurality of magnetic steels are disposed in the accommodating structure.

2. The permanent magnet motor rotor according to claim 1, characterized in that: The through hole is a tapered hole.

3. The permanent magnet motor rotor according to claim 1, characterized in that: The plurality of ventilation holes are evenly distributed along the circumference of the annular groove.

4. The permanent magnet motor rotor according to claim 3, characterized in that: The ventilation hole comprises a crescent-shaped hole.

5. The permanent magnet motor rotor according to any one of claims 1 to 4, characterized in that: The magnetic steel adopts a bar block structure, including a first surface and a second surface arranged opposite to each other, wherein: The first surface and the second surface both include arc structures, the arc structures of the first surface and the second surface have the same diameter but different center, and the diameter of the arc structure is the same as the nominal diameter of the shell.

6. The permanent magnet motor rotor according to claim 5, characterized in that: A gap is arranged between every two adjacent magnetic steels.

7. The permanent magnet motor rotor according to any one of claims 1 to 4, characterized in that: The cover body and the shell are positioned by using a stopper.

8. The permanent magnet motor rotor according to any one of claims 1 to 4, characterized in that: The permanent magnet motor rotor also includes a connecting piece, and a plurality of first connecting holes are also arranged on the outer shell, the first connecting holes are arranged on the outer periphery of the annular groove and the first connecting holes are evenly distributed, and a plurality of second connecting holes corresponding to the first connecting holes are arranged on the cover body, and the connecting piece connects the outer shell and the cover body through the first connecting holes and the second connecting holes.

9. The permanent magnet motor rotor according to claim 8, characterized in that: The shell, the connecting piece and the cover are all made of aluminum.

10. A permanent magnet motor, characterized in that: It comprises the permanent magnet motor rotor as described in any one of claims 1 to 9.

Images