High-speed motor rotor

Abstract

The high-speed motor rotor comprises a central shaft, and the central shaft comprises cylindrical parts at the two ends and a polygonal part in the middle. The central shaft penetrates through the outer sleeve part, and the cylindrical part of the central shaft is connected with the end part of the outer sleeve part; the number of the connecting pieces is multiple, polygonal holes matched with the polygonal parts are formed in the centers of the connecting pieces, and the center lines of the polygonal holes are parallel to the length direction of the outer sleeve part; a plurality of mounting grooves perpendicular to the length direction of the outer sleeve part are formed in the outer sleeve part at intervals, the mounting grooves are formed at intervals and penetrate through the outer sleeve part, the connecting pieces are sequentially inserted into the mounting grooves, the center shaft penetrates through the connecting pieces, and the polygonal part is matched with the polygonal hole to fix the connecting pieces and the polygonal hole. The smooth cylindrical outer sleeve part reduces the resistance generated when the connecting piece serving as the rotor rotates, so that vibration and noise generated when the rotor rotates are reduced, the low-air-resistance appearance of the outer surface of the rotor is guaranteed, and reliable connection between the center shaft and the outer sleeve part is also guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to precision machinery technical technical field, concretely is a kind of high-speed motor rotor. BACKGROUND

[0002] High-speed motor has the advantages of small size, power density, especially can be directly connected with high-speed running machinery, without transmission speed mechanism, it is advantageous to obtain higher efficiency advantage, make it widely used in aviation, aerospace, automobile and other fields.Further improve rotational speed, it is advantageous to motor performance promotion, but also be limited in some aspects, such as rotor mechanical strength is insufficient, higher centrifugal force causes permanent magnet damage etc.

[0003] Reluctance motor because of the rotor structure without permanent magnet, solve the problem of permanent magnet damage, and can use the structure with higher mechanical strength, thus higher rotational speed can be realized.But the salient pole on the rotor of reluctance motor makes rotor high-speed operation produce larger air resistance, and thus cause vibration and noise. UTILITY MODEL CONTENT

[0004] To solve the technical problems in the background art, the utility model provides a kind of high-speed motor rotor.

[0005] The utility model technical scheme is as follows:

[0006] A kind of high-speed motor rotor, comprising:

[0007] Center shaft, the center shaft includes the cylindrical portion of two ends and the polygonal portion of intermediate portion;

[0008] Outer sleeve portion, the center shaft is set through outer sleeve portion, and the cylindrical portion of center shaft is connected with the end of outer sleeve portion;

[0009] Connecting piece, the connecting piece is set with multiple, the polygonal hole of the center of connecting piece is set with and adapts to polygonal portion, and the center line of polygonal hole is parallel with the length direction of outer sleeve portion;

[0010] The outer sleeve portion is spaced apart and is provided with multiple installation grooves perpendicular to its length direction, and multiple installation grooves are spaced apart and set through outer sleeve portion, and multiple connecting pieces are sequentially inserted into multiple installation grooves, the center shaft is set through connecting piece and polygonal portion and polygonal hole are adapted to fix two.

[0011] To improve the reliability of the connection between the center shaft and multiple connecting pieces, avoid stress concentration phenomenon at contact point when high-speed rotation, the polygonal portion of center shaft is regular hexagon, and its cross-sectional width is greater than the diameter of cylindrical portion, the polygonal hole is correspondingly set as regular hexagon.

[0012] In order to reduce the air resistance of the rotor rotation, the outer sleeve part is a cylindrical part with a hollow cylindrical shape, and the cylindrical part is provided with a sealing plate part.

[0013] In order to further reduce the air resistance of the rotor rotation, the length of the connecting piece is consistent with the outer diameter of the cylindrical part, and the two ends are arc-shaped with a curvature consistent with the cylindrical part.

[0014] In order to improve the motor torque ripple and facilitate the monitoring of the rotor position, the cross-sectional shape of the plurality of connecting pieces is the same, and the plurality of installation grooves are staggered in the circumferential direction of the outer sleeve part.

[0015] In order to facilitate the installation of the central shaft and the plurality of connecting pieces, the lengths of the cylindrical parts at both ends of the central shaft are consistent, and the single cylindrical part is 1 / 4-1 / 2 of the length of the polygonal part.

[0016] In order to facilitate the installation of the central shaft, the center of the sealing plate part at both ends of the cylindrical part is provided with a through hole, and the diameters of the two through holes are not less than the diameter of the cylindrical part of the central shaft, and the diameter of any one through hole is not less than the maximum width of the polygonal part.

[0017] The specific design of the central shaft, the outer sleeve part and the connecting piece is that the central shaft and the outer sleeve part are made of low magnetic permeability material, and the connecting piece is made of a plurality of high magnetic permeability silicon steel sheets stacked.

[0018] The beneficial effects of the utility model lie in that: the utility model is a kind of high-speed motor rotor, compared with prior art, smooth and low magnetic permeability outer sleeve part is used in the scheme, and a plurality of high magnetic permeability connecting pieces are installed along the length direction of outer sleeve part, so that it has high salient pole ratio, and outer sleeve part can rotate with connecting piece, connecting piece can also be used as rotor core, smooth cylindrical outer sleeve part reduces the resistance when connecting piece rotates as rotor, then reduces vibration and noise generated when rotor rotates, and arc-shaped at both ends of connecting piece forms complete circle with outer sleeve part, which not only ensures the appearance of low air resistance of rotor outer surface, but also ensures reliable connection between central shaft and outer sleeve part, finally, through the interval arrangement of multiple installation grooves, rotor is segmented, which can not only enhance the connection strength of outer sleeve part and connecting piece, but also realize different functions such as providing rotor position signal and reducing torque ripple. BRIEF DESCRIPTION OF DRAWINGS

[0019] The scheme and advantages of the present application will become clear to those skilled in the art by reading the detailed description of the preferred embodiments below. The drawings are only for the purpose of illustrating the preferred embodiments and are not considered as limiting the utility model.

[0020] In the drawings:

[0021] Figure 1 It is a schematic diagram of rotor structure;

[0022] Figure 2 is a sectional view of the sleeve part;

[0023] Figure 3 is a schematic view of the connection part installation;

[0024] The components represented by the reference numerals in the drawings are as follows:

[0025] 1, center shaft; 11, cylindrical part; 12, polygonal part; 2, sleeve part; 21, cylindrical part; 22, sealing plate part; 23, through hole; 3, connection part; 4, polygonal hole; 5, installation groove. DETAILED DESCRIPTION

[0026] Exemplary embodiments of the present disclosure will be described in greater detail below with reference to the accompanying drawings.

[0027] Embodiments

[0028] As mentioned in the background, the existing high-speed motor can provide certain high-speed rotation requirements, but the strength of the rotor is low, and the high centrifugal force can cause damage to the permanent magnet. The absence of permanent magnets in the reluctance motor can solve the above problems, but the inventors found in experiments and actual use that the high-speed operation of the salient poles on the rotor can generate a large air resistance, which has certain defects. Therefore, the inventors improve the existing rotor and design a new type of high-speed motor rotor, which will be described in detail below in conjunction with the drawings.

[0029] The embodiment provides a high-speed motor rotor, referring to Figure 1 , comprising a center shaft 1, the center shaft 1 comprising a cylindrical part 11 at both ends and a polygonal part 12 at the middle part, the cross-sectional width of the polygonal part 12 being greater than the diameter of the cylindrical part 11, facilitating the fixation of the center shaft 1. In this scheme, the material of the center shaft 1 as a whole is made of low magnetic permeability materials such as aluminum and stainless steel, which can reduce the magnetic resistance and energy loss during motor operation. Secondly, it also comprises a sleeve part 2 connected with the center shaft 1, the sleeve part 2 is also made of the above-mentioned low magnetic permeability material, the center shaft 1 penetrates through the sleeve part 2, that is, the center shaft 1 can be transmitted into the sleeve part 2, the cylindrical part 11 of the center shaft 1 is connected with the end part of the sleeve part 2, and the connection part also serves as the rotor core, which is an intermediate part connecting the center shaft 1 and the sleeve part 2, so that the three can rotate or be stationary synchronously. In addition, the connection part 3 is made of a plurality of high magnetic permeability silicon steel sheets stacked together, which can improve the energy conversion efficiency and adapt to high-frequency working environment, etc.

[0030] Firstly, the connection between the connection part 3 and the sleeve part 2 is introduced, in this scheme, combined with Figure 2The sleeve part 2 is a cylindrical part 21 with a hollow cylindrical shape, which is provided with a sealing plate part 22 with a circular cross section, which can be integrally formed with the cylindrical part 21 or separately installed, and the outer surface of the cylindrical part 21 is smooth, which reduces the resistance generated when rotating with air. The sleeve part 2 is provided with a plurality of installation grooves 5 perpendicular to the length direction thereof, that is, the installation grooves 5 are provided in a direction perpendicular to the axis direction of the cylindrical part 21 and in the radial direction of the cylindrical part 21, and the plurality of installation grooves 5 are provided in the sleeve part 2 and penetrate the sleeve part 2. In addition, the connecting piece 3 is provided with a plurality of connecting pieces 3, and the plurality of connecting pieces 3 are sequentially inserted into the plurality of installation grooves 5, the width of the connecting piece 3 is consistent with the width of the installation groove 5, and the installation groove 5 can be blocked.

[0031] It should be noted that, in combination with Figure 3 The length of the connecting piece 3 is consistent with the outer diameter of the cylindrical part 21, which is in the radial direction of the cylindrical part 21, and the two ends are arc-shaped with a curvature consistent with the cylindrical part 21, that is, the shape of the installation groove 5 on the sleeve part 2 is adapted to the connecting piece 3, and after the connecting piece 3 is installed in the installation groove 5, the arc-shaped outer edge and the outer surface of the sleeve part 2 form a complete circle, which not only ensures the low air resistance of the rotor outer surface, but also ensures the reliable connection between the central shaft 1 and the sleeve part 2.

[0032] In the present scheme, the number of connecting pieces 3 and the number of installation grooves 5 are both two, and the cross-sectional shape of the plurality of connecting pieces 3 is the same, and the plurality of installation grooves 5 are staggered in the circumferential direction of the sleeve part 2, which avoids the existence of a long groove in the axial direction of the sleeve part 2 to reduce the structural strength thereof, and makes the phases of the two installation grooves 5 different, which can reduce torque pulsation. In addition, the installation grooves 5 are provided in a spaced manner, so that the rotor as the connecting piece 3 can be segmented, which can not only enhance the structural strength of the sleeve part 2, but also realize different functions of each segment, such as detecting the position of the rotor, reducing torque pulsation, etc.

[0033] The connecting mode of the connecting piece 3 and the central shaft 1 is that a polygonal hole 4 is provided in the center of the connecting piece 3, which is adapted to the polygonal part 12, and the center line of the polygonal hole 4 is parallel to the length direction of the sleeve part 2. It should be noted that the polygonal part 12 of the central shaft 1 is a regular hexagon, and the cross-sectional width thereof is greater than the diameter of the cylindrical part 11. The polygonal hole 4 is correspondingly provided as a regular hexagon, which can improve the reliability of the connection between the central shaft 1 and the plurality of connecting pieces 3, and avoid the stress concentration phenomenon at the contact point when rotating at high speed. After the connecting piece 3 is put into the installation groove 5, the central shaft 1 is inserted into the polygonal hole 4.

[0034] In addition, in combination with Figure 3The connection mode of the central shaft 1 and the sleeve part 2 is that the through holes 23 are arranged in the center of the sealing plate parts 22 at both ends of the cylindrical part 21, the diameters of the two through holes 23 are not less than the diameter of the cylindrical part 11 of the central shaft 1, the diameter of any one through hole 23 is not less than the maximum width of the polygonal part 12, in the scheme, the diameter of one of the through holes 23 is consistent with the diameter of the cylindrical part 11, and the diameter of the other through hole 23 is greater than the maximum width of the polygonal part 12, so that the central shaft 1 can be inserted into the sleeve part 2 through the through hole 23 with a larger diameter, until the cylindrical part 11 at the front end is matched with the through hole 23 with a smaller diameter, and the lengths of the cylindrical parts 11 at both ends of the central shaft 1 are consistent, and the single cylindrical part 11 is 1 / 4-1 / 2 of the length of the polygonal part 12, so that the polygonal part 12 has a larger length, and it is convenient to fix the plurality of connecting parts 3 which are installed at intervals.

Claims

1. A high-speed motor rotor, characterized in that: include: A central shaft (1), the central shaft (1) comprising cylindrical portions (11) at both ends and a polygonal portion (12) in the middle; An outer sleeve (2), wherein the central shaft (1) is disposed through the outer sleeve (2), and the cylindrical portion (11) of the central shaft (1) is connected to an end portion of the outer sleeve (2); A connecting member (3), wherein a plurality of connecting members (3) are provided, a polygonal hole (4) adapted to the polygonal portion (12) is provided at the center of the connecting member (3), and a center line of the polygonal hole (4) is parallel to the length direction of the outer sleeve (2); The outer sleeve (2) is provided with a plurality of installation grooves (5) perpendicular to its length direction at intervals, and the plurality of installation grooves (5) are provided at intervals and pass through the outer sleeve (2), the plurality of connecting members (3) are sequentially inserted into the plurality of installation grooves (5), the central axis (1) passes through the connecting member (3), and the polygonal portion (12) and the polygonal hole (4) are adapted to fix the two.

2. A high-speed motor rotor according to claim 1, characterized in that: The polygonal portion (12) of the central axis (1) is a regular hexagon, and its cross-sectional width is greater than the diameter of the cylindrical portion (11), and the polygonal hole (4) is correspondingly opened in a regular hexagon.

3. A high-speed motor rotor according to claim 1, characterized in that: The outer sleeve (2) comprises a hollow cylindrical portion (21), and the cylindrical portion (21) is provided with a sealing plate portion (22).

4. A high-speed motor rotor according to claim 3, characterized in that: The length of the connecting piece (3) is consistent with the outer diameter of the cylindrical portion (21), and both ends are arc-shaped with a curvature consistent with that of the cylindrical portion (21).

5. A high-speed motor rotor according to claim 3, characterized in that: The cross-sectional shapes of the multiple connecting members (3) are the same, and the multiple mounting grooves (5) are staggered in the circumferential direction of the outer sleeve (2).

6. A high-speed motor rotor according to claim 1, characterized in that: The lengths of the cylindrical portions (11) at both ends of the central axis (1) are consistent, and the length of a single cylindrical portion (11) is 1 / 4 to 1 / 2 of the length of the polygonal portion (12).

7. A high-speed motor rotor according to claim 3, characterized in that: Through holes (23) are provided in the centers of the sealing plate portions (22) at both ends of the cylindrical portion (21), and the diameters of the two through holes (23) are not less than the diameter of the cylindrical portion (11) of the central axis (1), and the diameter of any one of the through holes (23) is not less than the maximum width of the polygonal portion (12).

8. The high-speed motor rotor according to claim 1, characterized in that: The central shaft (1) and the outer sleeve (2) are made of low magnetic permeability materials, and the connecting piece (3) is made of a plurality of silicon steel sheets with high magnetic permeability stacked together.

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