Permanent magnet synchronous motor rotor structure and motor

Abstract

The utility model discloses a permanent magnet synchronous motor rotor structure and a motor, the permanent magnet synchronous motor rotor structure comprises a rotating shaft, a plurality of first magnets, a plurality of second magnets, a first skeleton, at least one second skeleton and a third skeleton, and the first skeleton, the at least one second skeleton and the third skeleton are successively sleeved on the rotating shaft at intervals. A plurality of first positioning spaces distributed in the circumferential direction of the rotating shaft are arranged between the first framework and the second framework, a plurality of second positioning spaces distributed in the circumferential direction of the rotating shaft are arranged between the second framework and the third framework, and the first magnets and the second magnets are sequentially and alternately arranged in the first positioning spaces. The first magnets and the second magnets are sequentially and alternately arranged in the second positioning spaces, and the magnets in the second positioning spaces and the first positioning spaces in the same axial direction are the same. By adopting the design mode, the cogging torque and the pulsating torque of the permanent magnet synchronous motor can be reduced and the production cost of the motor can be reduced by utilizing framework positioning.

Description

Technical Field

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

[0002] Permanent magnet synchronous motors on the market often use permanent magnets as the magnetic material of the rotor. Since the circumference of the rotating shaft is a smooth surface, it is easy to deviate when sticking the magnets, and it is impossible to accurately position them, which will cause assembly deviations of the magnetic poles and reduce the toothing torque and pulsating torque of the permanent magnet synchronous motor. Generally, positioning is performed by opening a positioning groove on the rotating shaft, and the magnets are pasted on the positioning groove to fix the magnets. However, the processing of the rotating shaft is difficult, and the cost of the die is high, which increases the cost of the motor. Therefore, how to solve the problems in the prior art that when using a magnet surface-mounted rotor structure, the magnets are easily deviated and difficult to position when directly pasted on the rotating shaft, and that opening a positioning groove on the rotating shaft to fix the magnets makes the rotor structure complicated and increases the cost of the motor, etc., has become an important technical problem to be solved by those skilled in the art. Utility Model Content

[0003] In order to overcome at least one of the defects of the above-mentioned prior art, the utility model provides a permanent magnet synchronous motor rotor structure and a motor to solve the problem in the prior art that when using a magnet surface-mounted rotor structure, the magnet is directly pasted on the rotating shaft and is prone to deviation and difficult to position, while opening a positioning groove on the rotating shaft to fix the magnet makes the rotor structure complicated and increases the cost of the motor.

[0004] The utility model is a technical solution adopted to solve the problem. In the first aspect, the embodiment of the utility model discloses a permanent magnet synchronous motor rotor structure, including a rotating shaft, a plurality of first magnets, a plurality of second magnets, a first skeleton, at least one second skeleton and a third skeleton, wherein the first skeleton, at least one second skeleton and the third skeleton are sequentially and spacedly sleeved on the rotating shaft, a plurality of first positioning spaces distributed along the circumference of the rotating shaft are provided between the first skeleton and the second skeleton, a plurality of second positioning spaces distributed along the circumference of the rotating shaft are provided between the second skeleton and the third skeleton, a plurality of the first magnets and a plurality of the second magnets are alternately arranged in the plurality of the first positioning spaces in sequence, a plurality of the first magnets and a plurality of the second magnets are alternately arranged in the plurality of the second positioning spaces in sequence, and the magnets in the second positioning spaces and the first positioning spaces on the same axial direction are the same.

[0005] As an optional implementation, in an embodiment of the utility model, when there are more than two second skeletons, a plurality of third positioning spaces distributed along the circumference of the rotating shaft are provided between two adjacent second skeletons, and a plurality of the first magnets and a plurality of the second magnets are alternately arranged in the plurality of third positioning spaces in sequence, and the magnets in the third positioning spaces and the first positioning spaces on the same axial direction are the same.

[0006] As an optional implementation, in an embodiment of the utility model, the first skeleton is provided with a plurality of first positioning protrusions evenly distributed along the circumference of the first skeleton, the second skeleton is provided with a plurality of second positioning protrusions evenly distributed along the circumference of the second skeleton and corresponding to the first positioning protrusions, and the first positioning space is formed between two adjacent first positioning protrusions and two adjacent second positioning protrusions;

[0007] The third skeleton is provided with a plurality of third positioning protrusions evenly distributed along the circumference of the third skeleton, and the second skeleton is provided with a plurality of fourth positioning protrusions evenly distributed along the circumference of the second skeleton and corresponding to the third positioning protrusions, and the second positioning space is formed between two adjacent third positioning protrusions and two adjacent fourth positioning protrusions.

[0008] As an optional implementation, in an embodiment of the utility model, the contour of the inner arc surface of the first skeleton, at least one of the second skeleton and the third skeleton in contact with the rotating shaft is an arc surface adapted to the circumferential surface of the rotating shaft.

[0009] As an optional implementation, in an embodiment of the utility model, the first frame, at least one of the second frames and the third frame are matched with the rotating shaft in a transitional fit.

[0010] As an optional implementation, in an embodiment of the utility model, the first magnet and the first positioning space are matched in a clearance fit in the circumferential direction of the rotating shaft, and the second magnet and the second positioning space are matched in a clearance fit in the circumferential direction of the rotating shaft.

[0011] As an optional implementation, in the embodiment of the utility model, the contours of the inner arc surfaces of each of the first magnets and each of the second magnets in contact with the rotating shaft are arc surfaces that are compatible with the circumferential surface of the rotating shaft.

[0012] As an optional implementation, in the embodiment of the utility model, there is an eccentricity between the inner arc surface and the outer arc surface of the first magnet, and the magnetization method of the first magnet is parallel magnetization;

[0013] There is an eccentricity between the inner arc surface and the outer arc surface of the second magnet, and the magnetization method of the second magnet is parallel magnetization.

[0014] As an optional implementation, in an embodiment of the utility model, a positioning step is provided at one end of the rotating shaft, and the first skeleton, at least one of the second skeletons and the third skeleton are arranged in sequence from one end of the rotating shaft where the positioning step is located to the other end, and the first skeleton abuts against the positioning step.

[0015] In a second aspect, an embodiment of the utility model discloses a motor, comprising a motor body and the permanent magnet synchronous motor rotor structure as described above, wherein the permanent magnet synchronous motor rotor structure is arranged on the motor body.

[0016] Implementing the embodiments of the present utility model will have the following beneficial effects:

[0017] The utility model is provided with a rotating shaft, a plurality of first magnets, a plurality of second magnets, a first skeleton, at least one second skeleton and a third skeleton, wherein the first skeleton, at least one second skeleton and the third skeleton are sequentially spaced and sleeved on the rotating shaft, a plurality of first positioning spaces distributed along the circumference of the rotating shaft are provided between the first skeleton and the second skeleton, a plurality of second positioning spaces distributed along the circumference of the rotating shaft are provided between the second skeleton and the third skeleton, a plurality of first magnets and a plurality of second magnets are alternately arranged in the plurality of first positioning spaces in sequence, a plurality of first magnets and a plurality of second magnets are alternately arranged in the plurality of second positioning spaces in sequence, and the second positioning spaces on the same axial direction are the same as the magnets in the first positioning spaces. By adopting such a design mode, the axial position and circumferential position of the first magnet and the second magnet are positioned by using the first skeleton, the second skeleton and the third skeleton, the assembly deviation of the first magnet and the second magnet can be reduced, and the cogging torque and pulsating torque of the permanent magnet synchronous motor can be reduced. In addition, since the skeleton production cost is lower than that of the mold opening mold, the production cost of the motor is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a structural schematic diagram of the permanent magnet synchronous motor rotor structure in the embodiment of the utility model;

[0020] Figure 2 It is a schematic diagram of the structural decomposition of the permanent magnet synchronous motor rotor structure in the embodiment of the utility model;

[0021] Figure 3 This is an end view of the first magnet in the embodiment of the utility model.

[0022] The meanings of the reference numerals are as follows:

[0023] 1-shaft; 11-positioning step; 2-first magnet; 3-second magnet; 4-first skeleton; 41-first positioning protrusion; 5-second skeleton; 51-second positioning protrusion; 52-fourth positioning protrusion; 6-third skeleton; 61-third positioning protrusion. DETAILED DESCRIPTION

[0024] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0025] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0027] Embodiment 1

[0028] See also Figures 1 to 3The embodiment of the utility model discloses a motor. The motor of the present scheme includes a motor body and a permanent magnet synchronous motor rotor structure. The permanent magnet synchronous motor rotor structure is arranged on the motor body. The permanent magnet synchronous motor rotor structure of the present scheme includes a rotating shaft 1, a plurality of first magnets 2, a plurality of second magnets 3, a first skeleton 4, at least one second skeleton 5 and a third skeleton 6. The first skeleton 4, at least one second skeleton 5 and the third skeleton 6 are sequentially arranged on the rotating shaft 1 at intervals. A plurality of first positioning spaces distributed along the circumference of the rotating shaft 1 are arranged between the first skeleton 4 and the second skeleton 5. A plurality of second positioning spaces distributed along the circumference of the rotating shaft 1 are arranged between the second skeleton 5 and the third skeleton 6. A plurality of first magnets 2 and a plurality of second magnets 3 are alternately arranged in the plurality of first positioning spaces in sequence. A plurality of first magnets 2 and a plurality of second magnets 3 are alternately arranged in the plurality of second positioning spaces in sequence. The magnets in the second positioning spaces and the first positioning spaces on the same axial direction are the same. By adopting such a design, the first skeleton 4, the second skeleton 5 and the third skeleton 6 are used to locate the axial position and the circumferential position of the first magnet 2 and the second magnet 3, so as to reduce the assembly deviation of the first magnet 2 and the second magnet 3, and reduce the cogging torque and pulsating torque of the permanent magnet synchronous motor. In addition, since the skeleton production cost is lower than that of the mold opening mold, the production cost of the motor is reduced.

[0029] The magnetic poles of the adjacent ends of the first magnet 2 and the second magnet 3 are opposite.

[0030] Further, at least one second skeleton 5 includes one second skeleton 5 and more than two second skeletons 5. When there are more than two second skeletons 5, a plurality of third positioning spaces distributed along the circumference of the rotating shaft 1 are provided between two adjacent second skeletons 5. A plurality of first magnets 2 and a plurality of second magnets 3 are alternately provided in the plurality of third positioning spaces in sequence. The magnets in the third positioning spaces and the first positioning spaces on the same axial direction are the same. This embodiment only takes the second skeleton 5 as an example.

[0031] In some embodiments, in order to form a first positioning space between the first skeleton 4 and the second skeleton 5 brackets, the first skeleton 4 is provided with a plurality of first positioning protrusions 41 evenly distributed along the circumference of the first skeleton 4, and the second skeleton 5 is provided with a plurality of second positioning protrusions 51 evenly distributed along the circumference of the second skeleton 5 and corresponding to the first positioning protrusions 41, and a first positioning space is jointly formed between two adjacent first positioning protrusions 41 and two adjacent second positioning protrusions 51.

[0032] Similarly, in order to form a second positioning space between the second skeleton 5 and the third skeleton 6, the third skeleton 6 is provided with a plurality of third positioning protrusions 61 evenly distributed along the circumference of the third skeleton 6, and the second skeleton 5 is provided with a plurality of fourth positioning protrusions 52 evenly distributed along the circumference of the second skeleton 5 and corresponding to the third positioning protrusions 61, and a second positioning space is formed between two adjacent third positioning protrusions 61 and two adjacent fourth positioning protrusions 52.

[0033] In some embodiments, in order to improve the fit between the first frame 4, at least one second frame 5 and the third frame 6 and the rotating shaft 1, the contour of the inner arc surface of the first frame 4, at least one second frame 5 and the third frame 6 in contact with the rotating shaft 1 is an arc surface adapted to the circumferential surface of the rotating shaft 1. With such a design, the inner side wall of the first frame 4, at least one second frame 5 and the third frame 6 in contact with the rotating shaft 1 is an arc surface, and its diameter is equal to the diameter of the outer circle of the rotating shaft 1, so that the contact surfaces of the two are completely fitted, the fit is tighter, and the positioning accuracy is higher.

[0034] In some embodiments, in order to facilitate the installation of the first frame 4, at least one second frame 5 and the third frame 6 on the rotating shaft 1, the first frame 4, at least one second frame 5 and the third frame 6 and the rotating shaft 1 are matched in a transition fit.

[0035] In some embodiments, the first magnet 2 and the first positioning space are matched in a clearance fit in the circumferential direction of the rotating shaft 1 , and the second magnet 3 and the second positioning space are matched in a clearance fit in the circumferential direction of the rotating shaft 1 .

[0036] In some embodiments, since the first magnet 2 and the second magnet 3 are directly attached to the rotating shaft 1, in order to make the first magnet 2 and the second magnet 3 have a good fit with the rotating shaft 1, the contours of the inner arc surfaces of each first magnet 2 and each second magnet 3 in contact with the rotating shaft 1 are all arc surfaces that match the circumferential surface of the rotating shaft 1. With such a design, the arc diameter is the same as the outer diameter of the portion where the rotating shaft 1 is attached, so that the first magnet 2 and the second magnet 3 are completely fitted with the circumferential surface of the rotating shaft 1, so that the first magnet 2 and the second magnet 3 are firmly installed, thereby improving the performance of the motor.

[0037] Furthermore, there is an eccentricity between the inner and outer arc surfaces of the first magnet 2, and the magnetization method of the first magnet 2 is parallel magnetization; there is an eccentricity between the inner and outer arc surfaces of the second magnet 3, and the magnetization method of the second magnet 3 is parallel magnetization. With such a design, the first magnet 2 and the second magnet 3 can obtain a perfect sinusoidal air gap magnetic field as much as possible, reducing radial electromagnetic force harmonics and torque pulsation.

[0038] In some embodiments, in order to better position the above-mentioned skeleton and magnet, a positioning step 11 is provided at one end of the rotating shaft 1, and the first skeleton 4, at least one second skeleton 5 and the third skeleton 6 are sequentially arranged from one end of the rotating shaft 1 where the positioning step 11 is located to the other end, and the first skeleton 4 abuts against the positioning step 11. With such a design, during assembly, the first skeleton 4 is first installed, and the first magnet 2 and the second magnet 3 are sequentially inserted into the first positioning space, and then the second skeleton 5 is installed, and then the first magnet 2 and the second magnet 3 are installed in sequence, and finally the third skeleton 6 is installed.

[0039] In some embodiments, the first frame 4, the at least one second frame 5 and the second frame 5 are made of plastic material. The frame made of plastic material is easy to shape, has low energy consumption and low production cost.

[0040] In some embodiments, in order to fix the first magnet 2 and the second magnet 3 on the rotating shaft 1, the first magnet 2 and the second magnet 3 are glued to the rotating shaft 1 using special magnetic steel glue.

[0041] The utility model provides a motor, which includes a rotating shaft 1, a plurality of first magnets 2, a plurality of second magnets 3, a first skeleton 4, at least one second skeleton 5 and a third skeleton 6, wherein the first skeleton 4, at least one second skeleton 5 and the third skeleton 6 are sequentially arranged on the rotating shaft 1 at intervals, a plurality of first positioning spaces distributed along the circumference of the rotating shaft 1 are arranged between the first skeleton 4 and the second skeleton 5, a plurality of second positioning spaces distributed along the circumference of the rotating shaft 1 are arranged between the second skeleton 5 and the third skeleton 6, a plurality of first magnets 2 and a plurality of second magnets 3 are alternately arranged in the plurality of first positioning spaces in sequence, a plurality of first magnets 2 and a plurality of second magnets 3 are alternately arranged in the plurality of second positioning spaces in sequence, and the second positioning spaces on the same axial direction are the same as the magnets in the first positioning spaces. By adopting such a design mode, the axial position and circumferential position of the first magnet 2 and the second magnet 3 are positioned by using the first skeleton 4, the second skeleton 5 and the third skeleton 6, the assembly deviation of the first magnet 2 and the second magnet 3 can be reduced, and the cogging torque and pulsating torque of the permanent magnet synchronous motor can be reduced. In addition, since the skeleton production cost is lower than that of the mold opening mold production cost, the production cost of the motor is reduced.

[0042] The technical means disclosed in the solution of the utility model are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical solutions composed of any combination of the above technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model, and these improvements and modifications are also regarded as the protection scope of the utility model.

Claims

1. A permanent magnet synchronous motor rotor structure, characterized in that: The invention comprises a rotating shaft (1), a plurality of first magnets (2), a plurality of second magnets (3), a first frame (4), at least one second frame (5) and a third frame (6); the first frame (4), at least one second frame (5) and the third frame (6) are sequentially and spacedly sleeved on the rotating shaft (1) along the axial direction of the rotating shaft (1); a plurality of first positioning spaces distributed along the circumference of the rotating shaft (1) are provided between the first frame (4) and the second frame (5); a plurality of second positioning spaces distributed along the circumference of the rotating shaft (1) are provided between the second frame (5) and the third frame (6); a plurality of the first magnets (2) and a plurality of the second magnets (3) are sequentially and alternately arranged in the plurality of the first positioning spaces; a plurality of the first magnets (2) and a plurality of the second magnets (3) are sequentially and alternately arranged in the plurality of the second positioning spaces; and the magnets in the second positioning spaces and the first positioning spaces on the same axial direction are the same.

2. The permanent magnet synchronous motor rotor structure according to claim 1, characterized in that: When there are more than two second skeletons (5), a plurality of third positioning spaces distributed along the circumference of the rotating shaft (1) are provided between two adjacent second skeletons (5); a plurality of the first magnets (2) and a plurality of the second magnets (3) are alternately arranged in the plurality of third positioning spaces in sequence; and the magnets in the third positioning spaces and the first positioning spaces on the same axial direction are the same.

3. The permanent magnet synchronous motor rotor structure according to claim 1, characterized in that: The first frame (4) is provided with a plurality of first positioning protrusions (41) evenly distributed along the circumference of the first frame (4), the second frame (5) is provided with a plurality of second positioning protrusions (51) evenly distributed along the circumference of the second frame (5) and corresponding to the first positioning protrusions (41), and the first positioning space is formed between two adjacent first positioning protrusions (41) and two adjacent second positioning protrusions (51); The third skeleton (6) is provided with a plurality of third positioning protrusions (61) uniformly distributed along the circumference of the third skeleton (6); the second skeleton (5) is provided with a plurality of fourth positioning protrusions (52) uniformly distributed along the circumference of the second skeleton (5) and corresponding to the third positioning protrusions (61); two adjacent third positioning protrusions (61) and two adjacent fourth positioning protrusions (52) together form the second positioning space.

4. The permanent magnet synchronous motor rotor structure according to any one of claims 1 to 3, characterized in that: The contours of the inner arc surfaces of the first frame (4), at least one of the second frames (5) and the third frame (6) in contact with the rotating shaft (1) are arc surfaces adapted to the circumferential surface of the rotating shaft (1).

5. The permanent magnet synchronous motor rotor structure according to any one of claims 1 to 3, characterized in that: The first frame (4), at least one of the second frames (5) and the third frame (6) are matched with the rotating shaft (1) in a transitional matching manner.

6. The permanent magnet synchronous motor rotor structure according to any one of claims 1 to 3, characterized in that: The first magnet (2) and the first positioning space cooperate in a clearance fit in the circumferential direction of the rotating shaft (1), and the second magnet (3) and the second positioning space cooperate in a clearance fit in the circumferential direction of the rotating shaft (1).

7. The permanent magnet synchronous motor rotor structure according to any one of claims 1 to 3, characterized in that: The contours of the inner arc surfaces of each of the first magnets (2) and each of the second magnets (3) in contact with the rotating shaft (1) are all arc surfaces that match the circumferential surface of the rotating shaft (1).

8. The permanent magnet synchronous motor rotor structure according to claim 7, characterized in that: The inner arc surface and the outer arc surface of the first magnet (2) have an eccentricity, and the magnetization method of the first magnet (2) is parallel magnetization; There is an eccentricity between the inner arc surface and the outer arc surface of the second magnet (3), and the magnetization method of the second magnet (3) is parallel magnetization.

9. The permanent magnet synchronous motor rotor structure according to any one of claims 1 to 3, characterized in that: A positioning step (11) is provided at one end of the rotating shaft (1); the first frame (4), at least one of the second frames (5) and the third frame (6) are arranged in sequence from one end of the rotating shaft (1) where the positioning step (11) is located to the other end; the first frame (4) abuts against the positioning step (11).

10. A motor, characterized in that: It comprises a motor body and a permanent magnet synchronous motor rotor structure as claimed in any one of claims 1 to 9, wherein the permanent magnet synchronous motor rotor structure is arranged on the motor body.

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