CN215378591U

CN215378591U - Rotor subassembly, motor and compressor

Info

Publication number: CN215378591U
Application number: CN202121778087.7U
Authority: CN
Inventors: 陈锴
Original assignee: Guangdong Welling Motor Manufacturing Co Ltd; Welling Wuhu Motor Manufacturing Co Ltd
Current assignee: Guangdong Welling Motor Manufacturing Co Ltd; Welling Wuhu Motor Manufacturing Co Ltd
Priority date: 2021-07-30
Filing date: 2021-07-30
Publication date: 2021-12-31
Anticipated expiration: 2031-07-30

Abstract

The application provides a rotor subassembly, motor and compressor. The rotor assembly includes the following components: the rotating shaft is provided with a central axis, a shaft extension end and a non-shaft extension end, and the shaft extension end is provided with a flat surface; the rotor iron core is connected with the non-shaft extension end and is provided with a first side surface which is positioned on one side facing the shaft extension end and is provided with a first balancing hole and a second side surface which is opposite to the first side surface and is provided with a second balancing hole; the first balance hole has an overall centroid X1, the second balance hole has an overall centroid X2; the first balance hole is smaller in volume than the second balance hole; in the direction vertical to the flat surface, X1 and X2 are respectively arranged on two sides of the central axis and respectively have the same distance with the central axis, and the distance from X1 to the plane of the flat surface is smaller than X2; the distance from X1 to the equatorial plane is smaller than the distance from X2 to the equatorial plane. The application provides a rotor subassembly can realize exempting from dynamic balance to realize cancelling the dynamic balance process in the motor production, and then promote motor production efficiency, reduction in production cost.

Description

Rotor subassembly, motor and compressor

Technical Field

The application belongs to the technical field of motors, and more specifically relates to a rotor assembly, a motor and a compressor.

Background

In the current common electric motor, the rotor of the electric motor is one of the key components that determine the cost and performance of the electric motor. In the production and design process of the motor, in order to more conveniently realize the fixed connection with an external load, the rotor comprises a rotating shaft, one end of the rotating shaft is generally provided with a flat surface, but the design of the flat surface can cause the rotating shaft to be eccentric along the radial mass, so that the rotor has dynamic unbalance, and the dynamic unbalance can not only cause the motor to generate larger vibration noise during the operation, but also accelerate the abrasion of other parts connected with the rotor, and reduce the service life and the efficiency of the motor. In order to solve this problem, currently, during the production process of the motor, the rotor is usually subjected to dynamic balance detection to realize dynamic balance correction, wherein one of the most common ways is a weight increasing way, i.e. attaching balance mud on the rotor. However, this dynamic balance correction approach has several disadvantages: firstly, manual operation is needed when the initial unbalance amount of the rotor is tested and the balance mud is added, so that the process is complicated and the efficiency is low; secondly, after the balance daub is pasted on the rotor, the balance daub can be completely cured within at least 4 hours, so that a production breakpoint is formed before the next procedure is carried out; thirdly, because the balance mud is stuck on the rotor, certain falling risk exists. As described above, the existing motor dynamic balance detection method has a high cost but a low efficiency, and is a technical problem to be solved in the field.

SUMMERY OF THE UTILITY MODEL

An object of the embodiment of this application is to provide a rotor subassembly to solve the lower and higher technical problem of cost of dynamic balance detection efficiency of the motor that exists among the prior art.

In order to achieve the purpose, the technical scheme adopted by the application is as follows: providing a rotor assembly comprising:

the rotating shaft is provided with a central axis, and a shaft extension end and a non-shaft extension end which are oppositely arranged along the axial direction, and the shaft extension end is provided with a flat surface; and the number of the first and second groups,

the rotor iron core is connected with the non-shaft extension end and is provided with a first side surface located on one side facing the shaft extension end and a second side surface located on one side departing from the shaft extension end; the first side surface is provided with a plurality of first balance holes, the first balance holes are provided with integral centroids X1, the second side surface is provided with a plurality of second balance holes, and the second balance holes are provided with integral centroids X2;

the volume of the first balance hole is smaller than that of the second balance hole; in the direction vertical to the flat surface, X1 and X2 are respectively arranged on two sides of the central axis, the distances from X1 and X2 to the central axis are consistent, and the distance from X1 to the flat surface is smaller than the distance from X to the flat surface; in a direction parallel to the central axis, a plane passing through the center of the equatorial plane and perpendicular to both the equatorial plane and the central axis is the equatorial plane, and the distance from X1 to the equatorial plane is smaller than the distance from X2 to the equatorial plane.

Optionally, the depth direction of the first balancing hole and the depth direction of the second balancing hole are both parallel to the central axis.

Optionally, the first balancing holes and the second balancing holes have the same diameter and number, and the hole depth of the first balancing holes is smaller than that of the second balancing holes.

Optionally, the rotor core includes a stacked first laminations and B stacked second laminations;

the first punching sheet is provided with C first punching holes, the first punching holes corresponding to the A positions are communicated to form first through holes, and the first balance holes comprise first through holes; d second punched holes are formed in the second punching sheet, the second punched holes corresponding to the B positions are communicated to form second through holes, and the second balance holes comprise second through holes; A. b, C and D are both positive integers.

Optionally, the thicknesses of the first punching sheet and the second punching sheet are consistent, and the structures of the first punching hole and the second punching hole are consistent; a is less than B.

Optionally, the rotor core further includes E stacked third punching sheets disposed between the first punching sheet and the second punching sheet, the first punching sheet, the second punching sheet, and the third punching sheet are all provided with center holes, and the center holes allow the rotating shaft to pass through.

Optionally, F third punched holes are formed in the third punching sheet;

e and F are positive integers, F is larger than C, F is larger than D, and C third punched holes are communicated with the first through holes corresponding to the positions to form C first balance holes; the D third punched holes are communicated with the second through holes corresponding to the positions to form D second balance holes.

Optionally, the F third punches are arranged in an annular array about the axis of rotation.

Alternatively, the first balance hole and the second balance hole are each a sector hole gradually enlarged outward in the radial direction of the rotor core.

Optionally, on the first punched sheet, a central connecting line of two first punched holes located at two ends is parallel to the flat surface; and on the second punching sheet, the central connecting line of the two second punching holes positioned at the two ends is parallel to the flat surface.

The present application also proposes an electric machine comprising a rotor assembly as described above.

The present application also proposes a compressor comprising an electric motor as previously described.

The application provides a rotor subassembly's beneficial effect lies in: compared with the prior art, in the rotor assembly of this application, because the shaft extension end at the pivot is equipped with the flat surface, the flat surface of pivot can produce the dynamic unbalance amount of specific direction, and the dynamic unbalance amount accessible of this flat surface sets up the mode of a plurality of first balance holes and a plurality of second balance hole respectively in the direction perpendicular with the flat surface in the both sides of central axis and offsets. The design of the first balancing holes and the second balancing holes meets the condition that the distances from the integral centroids X1 of the first balancing holes and the integral centroids X2 of the second balancing holes to the central axis are consistent, and the distance from X1 to the plane of the flat surface is smaller than the distance from X2 to the plane of the flat surface; in a direction parallel to the central axis, a plane passing through the center of the equatorial plane and perpendicular to both the equatorial plane and the central axis is the equatorial plane, and the distance from X1 to the equatorial plane is smaller than the perpendicular distance from X2 to the equatorial plane. After the weight reduction design of the rotor core is carried out, the rotor core can also generate the dynamic unbalance amount which is consistent with but opposite to the total dynamic unbalance amount of the flat surface, so that after the rotating shaft is assembled with the rotor core according to the specific position meeting the conditions, the dynamic unbalance amount generated by the flat surface can be mutually offset with the dynamic unbalance amount of the rotor core, the rotor assembly and the corresponding motor which are installed in the way can meet the dynamic balance standard, and the cancellation of the dynamic balance process can be realized in the motor production process. In other words, the design of the rotor subassembly of this application can not carry out the dynamic balance process in production, also need not to paste balanced mud through the manual work on the rotor and realize balanced correction, also can not have the production breakpoint phenomenon because of balanced mud curing time is longer and cause naturally, more can not have the risk that balanced mud drops, consequently, the technical scheme of this application can effectively improve the efficiency that motor dynamic balance detected, and then is favorable to promoting motor production efficiency and further reduction in production cost.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

FIG. 1 is a cross-sectional view of a rotor assembly provided in an embodiment of the present application;

FIG. 2 is an enlarged schematic view at G of FIG. 1;

fig. 3 is a schematic structural diagram of a first stamped sheet provided in the embodiment of the present application;

fig. 4 is a schematic structural diagram of a second stamped sheet provided in the embodiment of the present application;

fig. 5 is a schematic structural diagram of a third punching sheet provided in the embodiment of the present application.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				100	Rotating shaft	200	Rotor core
110	Shaft extension end	120	Non-axial extension end
				111	Flat noodles	230	Center through hole
210	First side surface	220	Second side surface
				240	First balance hole	250	Second balance hole
260	First punching sheet	261	First punched hole
				270	Second punching sheet	271	Second punched hole
280	Third punching sheet	281	Third punched hole
				300	Magnetic shoe	290	Riveting part

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It should be noted that the terms of orientation such as left, right, up and down in the embodiments of the present application are only relative to each other or are referred to the normal use state of the product, and should not be considered as limiting.

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

The embodiment of the application provides a rotor assembly.

Referring to fig. 1 and 2, in one embodiment, the rotor assembly includes a rotating shaft 100 and a rotor core 200; the rotating shaft 100 has a shaft extension end 110, a non-shaft extension end 120 and a central axis L0 extending along the axial direction, and the shaft extension end 110 is provided with a flat surface 111; the rotor core 200 is interference-coupled to the non-shaft-extending end 120 of the rotating shaft 100. It can be understood that the non-shaft-extending end 120 of the rotating shaft 100 is cylindrical and has a central axis L0, the central axis of the rotating shaft 100 is referred to as the central axis L0 of the non-shaft-extending end 120, and since the shaft-extending end 110 is provided with the flat surface 111, the distance from any point on the central axis L0 to the flat surface 111 is different from the distance from the point to other surface areas of the shaft-extending end 110.

The rotor core 200 is shaped like a circular ring and has a central through hole 230 that penetrates forward and backward along the axial direction of the rotating shaft 100, the non-shaft-extending end 120 of the rotating shaft 100 penetrates through the central through hole 230 and then is connected with the rotor core 200 in an interference manner, and the central through hole 230 and the rotating shaft 100 are coaxially arranged.

As shown in fig. 2, the rotor core 200 has 110210 located on the side facing the shaft-extending end 110 and a second side 220 located on the side facing away from the shaft-extending end 110, where the first side 210 is further provided with a plurality of first balancing holes 240; the non-axial end face 220 is disposed away from the flat surface 111, and a plurality of second balance holes 250 are disposed on the non-axial end face 220.

Here, for the first balance hole 240, the volume thereof is smaller than that of the second balance hole 250, and has an overall centroid X1; the second balance hole has an overall centroid X2. As shown in fig. 1, in the direction perpendicular to the flat surface 111, X2 and X1 are respectively disposed on two sides of the central axis L0, the distance from X1 to the central axis L0 is L3, which is the same as the distance from X2 to the central axis L0, the distance from X1 to the plane S3 where the flat surface 111 is located is L4, and L4 is smaller than the distance from X2 to the plane S3 where the flat surface 111 is located, i.e., L5; in the direction parallel to the central axis L0, a plane passing through the center of the equatorial plane 111 and perpendicular to both the equatorial plane 111 and the central axis L0 is the equatorial plane S4, the distance from X1 to the equatorial plane S4 is L6, and L6 is smaller than the distance from X2 to the equatorial plane L7. When the rotor assembly is balanced in a weight-reducing manner, the influence factors of the dynamic unbalance amount of the rotor assembly include the volume of the first balancing hole 240 and the second balancing hole 250, and the distances between the first balancing hole 240 and the second balancing hole 250 and the central axis L0, the plane S3 where the flat surface 111 is located, and the flat central plane S4, and the like, at this time, since the flat surface 111 is disposed at the shaft extension end 110 of the rotating shaft 100, the centroid of the rotating shaft 100 is deviated from the central axis L0 and is located at one side far from the flat surface 111, and only when the above structural design is satisfied, that is, the weight reduction amount of the portion of the rotor core 200 at the same side as the flat surface 111 is less than that of the other side, and the first balancing hole 240 is closer to the flat surface 111 than the second balancing hole 250, the compensation effect of the dynamic unbalance amount caused by the flat surface 111 can be realized.

Here, in the present embodiment, as shown in fig. 1, the axial direction of the rotating shaft 100 is taken as the front-rear direction, the direction from the non-shaft-extending end 120 to the shaft-extending end 110 is taken as the rear-front direction, the direction perpendicular to the flat surface 111 is taken as the up-down direction, the overall centroid X1 of the first balance hole 240 is located above the flat surface 111, and the overall centroid X2 of the second balance hole 250 is located below the flat surface 111. The flat surface 111 of the rotating shaft 100 is disposed at the shaft extension end 110 far away from the rotor core 200, the flat surface 111 is parallel to the central axis L0 of the rotating shaft 100, that is, is disposed parallel to the axial direction of the rotating shaft 100, of course, the flat surface 111 may also be other types of surfaces, which may be, but not limited to, an arc surface, etc., but the arrangement of the flat surface 111 is favorable for more conveniently calculating and determining the centroid of the rotating shaft 100, and further, is convenient for calculating the compensation amount of the dynamic balance amount. Specifically, the flat surface 111 may be formed by turning the shaft extension end 110 of the rotating shaft 100, and the flat surface 111 is a bottom surface of a turned notch, and the notch is opened forward and upward, so that the flat surface 111 can be better fixedly connected to an external load. In one embodiment, the first balance hole 240 should be larger than the second balance hole with respect to the hole depth, provided that the first balance hole 240 and the second balance hole 250 have the same hole diameter and number. In the present embodiment, the hole depth refers to a depth in the axial direction of the hole, i.e., a distance from the opening of the hole to the bottom surface of the hole.

In one embodiment, the depth direction of the first balance hole 240 is parallel to the central axis L0, that is, parallel to the axial direction of the rotating shaft 100, and since the rotor core 200 coincides with the axial direction of the rotating shaft 100 and the depth direction of the second balance hole 250 is parallel to the depth direction of the first balance hole 240, the depth direction of the second balance hole 250 is also parallel to the axial direction of the rotating shaft 100. When there is one first balance hole 240, the overall centroid X1 of the first balance hole 240 is the center of the hole, and when there are a plurality of first balance holes 240, the overall centroid of the plurality of first balance holes 240 is located on the first axial plane S1, the first axial plane S1 is perpendicular to the flat surface 111 and passes through the central axis L0 of the rotating shaft 100, and the overall centroid X1 refers to the geometric center of the plurality of first balance holes 240 in space. It is understood that each first balance hole 240 has a corresponding hole center, and the overall centroid of the plurality of first balance holes 240 can be regarded as the geometric center of a polygonal figure formed by connecting the plurality of hole centers in sequence, and of course, the polygonal figure can be a two-dimensional figure or a three-dimensional figure. When the axial positions of the plurality of first balance holes 240 are the same and the depths thereof are the same, the polygonal figure is a two-dimensional figure, the plane of the two-dimensional figure is parallel to the cross section perpendicular to the depth direction of the first balance holes 240, and the overall centroid of the plurality of first balance holes 240 is the geometric center of the two-dimensional figure.

Similarly, the number of the second balancing holes 250 may be one or more, when there is one second balancing hole 250, the centroid of the second balancing hole 250 is the center of the hole, and when there is a plurality of second balancing holes 250, the overall centroid of the plurality of second balancing holes 250 is located on the second axial plane S2, and the second axial plane S2 is perpendicular to the flat surface 111 and passes through the central axis L0 of the rotating shaft 100, and the overall centroid is the geometric center of the plurality of second balancing holes 250 in space. Specifically, the overall centroid is determined in the same manner as the overall centroid of the plurality of first balance holes 240, and a description thereof will not be repeated.

Based on the structural design, in the embodiment, since the flat surface 111 is disposed at the shaft extension end 110 of the rotating shaft 100, the flat surface 111 of the rotating shaft 100 generates a dynamic unbalance amount in a specific direction, and the dynamic unbalance amount of the flat surface 111 can be offset by disposing the first balance holes 240 and the second balance holes 250 on two sides of the central axis L0 in a direction perpendicular to the flat surface 111. Here, the first balancing holes 240 and the second balancing holes 250 are designed such that the distance from the centroid X1 of the first balancing holes 240 to the central axis L0 is the same as the distance from the centroid X2 of the second balancing holes 250 to the central axis L0, and the distance from the centroid X1 to the plane S3 where the flat surface 111 is located is smaller than the distance from the centroid X2 to the plane S3 where the flat surface 111 is located; in the direction parallel to the central axis L0, defining the equatorial plane S4 as a plane passing through the center of the equatorial plane 111 and perpendicular to both the equatorial plane 111 and the central axis L0, the distance from X1 to the equatorial plane S4 is smaller than the distance from X2 to the equatorial plane S4. After the weight reduction design of the rotor core 200 is performed, the rotor core 200 can also generate the dynamic unbalance amount which is consistent with but opposite to the total dynamic unbalance amount of the flat surface 111, so that after the rotating shaft 100 is assembled with the rotor core 200 according to the specific position meeting the above conditions, the dynamic unbalance amount generated by the flat surface 111 can be offset with the dynamic unbalance amount of the rotor core 200, and the rotor assembly and the corresponding motor which are installed in such a way can meet the dynamic balance standard, thereby canceling the dynamic balance process in the motor production process. In other words, the design of the rotor subassembly of this application can not carry out the dynamic balance process in production, also need not to paste balanced mud through the manual work on the rotor and realize balanced correction, also can not have the production breakpoint phenomenon because of balanced mud curing time is longer and cause naturally, more can not have the risk that balanced mud drops, consequently, the technical scheme of this application can effectively improve the efficiency that motor dynamic balance detected, and then is favorable to promoting motor production efficiency and further reduction in production cost.

As shown in fig. 2, if the overall thickness of the rotor core 200 is L, L1 is the distance between the second side surface 220 and the bottom surface of the first balancing hole 240, and L2 is the distance between the first side surface 210 and the second balancing hole 250, when the first side surface 210 and the second side surface 220 are parallel to each other, if the depth of the hole is greater than that of the first balancing hole 250, L2 should be smaller than L1, and L2 is smaller than the overall thickness L of the rotor core 200, and if the second balancing hole 250 is a blind hole that does not penetrate through the first side surface 210, L2 is not zero; if the second balance hole 250 is a through hole penetrating the first side surface 210 and the second side surface 220, L2 is zero; l1 is smaller than the entire thickness L of the rotor core 200, wherein the first balance hole 240 is a blind hole that does not penetrate the second side 220 when L1 is greater than zero. In other words, in the present application, on rotor core 200, there is the following relationship between L1 and L2 and the overall thickness of rotor core 200: l > L1 > L2, and the specific value thereof should be determined according to the actual design requirement of the rotor assembly, so that the unbalance generated by the flat surface 111 of the rotating shaft 100 and the unbalance of the rotor core 200 punched with the specific balance hole can be mutually offset, thereby satisfying the dynamic balance standard of the motor.

Referring to fig. 2, fig. 3 and fig. 5, in the present embodiment, the rotor core 200 includes a plurality of stamped sheets, where the number of the first stamped sheets 260 is a, and the first stamped sheets 260 are stacked; the number of the second punching sheets 270 is B, and the second punching sheets 270 are also in a laminated state; c first punched holes 261 are formed in the first punched piece 260 through high-pressure punching; d second punched holes 271 are formed in the second punching sheet 270 through high-pressure punching; A. c, B and D are both positive integers here.

Specifically, the rotor core 200 has 2n magnetic poles, n is a positive integer, and the rotor core 200 is formed by punching and stacking a plurality of silicon steel sheets so as to achieve the effect of reducing eddy current and hysteresis loss caused by alternating magnetic potential, that is, the stacked punching sheets are all made of silicon steel sheets with good magnetic conduction; the plurality of first punched holes 261 in the first punching sheet 260 and the plurality of second punched holes 271 in the second punching sheet 270 may be formed by high punching in a specific direction. Of course, in other embodiments, the rotor core 200 may also be made of a single piece of magnetic conductive material, but in this embodiment, the rotor core 200 formed by punching and stacking a plurality of silicon steel sheets has the advantages of being convenient to manufacture and better in magnetic conductivity.

Further, referring to fig. 3 and fig. 5, in the present embodiment, the thickness of the first punching sheet 260 is the same as that of the second punching sheet 270, and the structure of the first punching hole 261 is the same as that of the second punching hole 271. Under the structural condition, A is less than B, C is less than or equal to D, namely the number of the first punching sheets 260 facing one side of the flat surface 111 is less than that of the second punching sheets 270 facing one side of the flat surface 111, so that the hole depth of the first through holes formed by laminating a smaller number of punching sheets can be smaller on the premise that the thicknesses of the two punching sheets are equal, the design that the hole depth of the first balance holes 240 is less than that of the second balance holes 250 can be further ensured, and the manufacturing and the design of the rotor core 200 are facilitated. Specifically, in this embodiment, the first punching sheet 260 may be 5, the second punching sheet 270 is 6, and the number of the second punching sheets 270 is greater than that of the first punching sheets 260. Meanwhile, since the first punched holes 261 have the same structure as the second punched holes 271, the influence of each punched hole on the dynamic unbalance of the rotor core 200 is the same, and therefore, on the premise of the structure, the number of the first punched holes 261 of each first punched sheet 260 should be less than or equal to the number of the second punched holes 271 of each second punched sheet 270, so that the correct design of the dynamic balance of the rotor core 200 can be ensured.

Specifically, as shown in fig. 3 and 5, 5 first punched holes are provided in one first punching sheet 260, and 5 second punched holes 271 are also provided in one second punching sheet 270. However, the design is not limited to this, and in other embodiments, the specific arrangement of the first punching sheet 260 and the second punching sheet 270 is not limited to the foregoing manner, but has various implementation manners. The thicknesses of the first stamped piece 260 and the second stamped piece 270 may be different, when the first stamped piece 260 is thinner than the second stamped piece 270, the situation that the number of the first stamped pieces 260 is greater than that of the second stamped piece 270 exists, and at this time, it is only necessary to ensure that the first through holes are smaller than the second through holes in terms of hole depth. For another example, the first punched hole 261 and the second punched hole 271 may also be different in structural size, that is, in the actual motor design, a suitable rotor core 200 may be designed according to the actual requirement and the specific situation of the flat surface 111, that is, by determining the number of the first punched pieces 260 and the second punched pieces 270, and the number, size, position arrangement, and the like of the first punched hole 261 and the second punched hole 271, it is ensured that after the rotating shaft 100 and the rotor core 200 are assembled, the dynamic unbalance amount generated by the flat surface 111 and the dynamic unbalance amount of the rotor core 200 can be offset with each other, so that the motor can meet the dynamic balance standard, thereby canceling the dynamic balance process in the motor production process, and achieving the purposes of improving the motor production efficiency and reducing the cost.

Further, referring to fig. 4, in the present embodiment, the rotor core 200 further includes third punching sheets 280, the number of the third punching sheets 280 is E, and the third punching sheets 280 are sandwiched between the second punching sheet 270 and the first punching sheet 260. F third punched holes 281 are formed in the third punching sheet 280. Wherein E and F are positive integers, F is larger than C, F is larger than D, and A of the F third punched holes 281 are respectively communicated with the first through holes corresponding to the positions to form C first balance holes 240; b of the F third punched holes 281 communicate with the second through holes corresponding in position, respectively, to form D second balance holes 250. Of course, in other embodiments, the third punched piece 280 may not be provided with the third punched hole 281, or the number of the third punched holes 281 is less than that of the first punched hole 261 or the second punched hole 271, but since the remaining silicon steel sheet remainder of the punched holes can be further recycled, the hole forming arrangement of the third punched piece 380 in the embodiment has the advantage of saving material and reducing cost.

Here, in order to facilitate the manufacturing and design of the rotor core 200, the first stamped sheet 260, the second stamped sheet 270 and the third stamped sheet 280 have the same profile shape, but openings on the third stamped sheet 280 are more than the first stamped sheet 260 and the second stamped sheet 270, and the opening position of the first punched hole 261 is different from the opening position of the second punched hole 271; meanwhile, the first stamped sheet 260, the second stamped sheet 270 and the third stamped sheet 280 are provided with center holes, the center holes of the first stamped sheet 260, the second stamped sheet 270 and the third stamped sheet 280 are coaxially arranged, and the center holes of the three types of stamped sheets are communicated to form a center through hole 230 of the rotor core 200.

As shown in fig. 3 to 5, in this embodiment, the arrangement of each punching sheet from front to back is as follows: the plurality of stacked third punching sheets 280 are arranged between the first punching sheet 260 and the second punching sheet 270, so that the magnetic conductivity of the rotor core 200 is improved, the gravity center of the rotor core 200 is stabilized to a certain degree, and the dynamic balance performance of the rotor core 200 is further improved.

It should be noted that, if a plurality of third punching sheets 280 are not disposed between the first punching sheet 260 and the second punching sheet 270, the first through hole is actually the first balance hole 240, and the second through hole is actually the second balance hole 250. At this time, the first balance hole 240 and the second balance hole 250 are axially spaced without an overlapping portion. After the third punching sheet 280 is disposed, the first balance hole 240 is the first through hole and the third punching hole 281 corresponding to and communicating with the first through hole in position, and the second balance hole 250 is the second through hole and the third punching hole 281 corresponding to and communicating with the second through hole in position. At this time, the first balance hole 240 and the second balance hole 250 partially overlap in the axial direction. Of course, in the axial direction of the rotor core, a situation may also occur that a part of the first balance hole 240 located at the front side and a part of the second balance hole 250 located at the rear side are correspondingly overlapped, at this time, if the third punched hole 281 is not provided, the first balance hole 240 is directly communicated with the second balance hole 250 to form a through balance hole penetrating through the first side surface 210 and the second side surface 220, that is, in this case, the first balance hole 240 may extend to the second punched piece 270, and the second balance hole 250 may directly extend to the first punched piece 260; of course, after the third punched holes 281 are provided, the first balance hole 240 may communicate with the second balance hole 250 through the corresponding third punched holes 281, and a through balance hole penetrating through the first side surface 210 and the second side surface 220 may also be formed. It can be understood that under the premise of meeting the design of the dynamic unbalance amount and the strength and magnetic conductivity of the punching sheet, the punching quantity can be increased properly, so that more punching excess materials can be recycled, and the purposes of saving materials and reducing cost are achieved.

Further, as shown in fig. 3 to 5, in the present embodiment, the F third punched holes 281 are arranged in an annular array around the rotating shaft 100. Here, in order to facilitate the manufacturing and balance design of the rotor core 200, the first punched hole 261 and the third punched hole 281 corresponding to the first punched hole 261 should be arranged with a common hole center axis, that is, on the same first punched plate 260, a connection line of hole centers of the plurality of first punched holes 261 is an upward convex circular arc, and the plurality of first punched holes 261 are uniformly distributed at intervals; similarly, on the same second punching sheet 270, the line connecting the hole centers of the second punched holes 271 is a concave arc, and the second punched holes 271 are uniformly distributed at intervals. Of course, in other embodiments, the number and the position arrangement of the first punched hole 261, the second punched hole 271 and the third punched hole 281 may also be set according to actual requirements. Riveting parts 290 convenient for lamination, alignment and connection of the punching sheets are arranged on the three punching sheets.

Further, as shown in fig. 1 and fig. 3 to 5, in the present embodiment, the centers of the two first punched holes 261 respectively located at the two ends of the circular arc are connected to form a central line, and the flat surface 111 is parallel to the central line; similarly, the centers of the two second punched holes 271 located at the two ends of the circular arc are connected to form a center connecting line, and the center connecting line is also parallel to the flat surface 111. Here, since the punched holes may be arranged in a uniform structure and at uniform intervals, the first punched holes 261 on the first punching sheet 260 are symmetrical with respect to a central axial plane passing through the central axis L0 and perpendicular to the flat surface 111, and the second punched holes 271 on the second punching sheet 270 are also symmetrical with respect to the central axial plane. It can be understood that the symmetrical arrangement of the first punched hole 261 and the second punched hole 271 not only facilitates design and calculation of the dynamic balance amount during dynamic balance correction, but also facilitates design and manufacturing of each punching sheet of the rotor core 200.

Referring to fig. 3 to fig. 5, in the present embodiment, specifically, the first punched hole 261, the second punched hole 271 and the third punched hole 281 have the same size and structure, so as to facilitate processing and manufacturing; the first punched hole 261, the second punched hole 271 and the third punched hole 281 are all arranged in a fan shape, and the fan-shaped holes are gradually expanded outwards along the radial direction of the rotor core 200, and the fan-shaped punched hole design can enable the counter electromotive force value of the rotor core 200 to be better. Of course, in other embodiments, the sizes and shapes of the first punched hole 261, the second punched hole 271 and the third punched hole 281 may be different or partially the same. .

Referring to fig. 1, in order to normally realize the operation of the rotor assembly of the motor, the rotor assembly further includes a magnetic shoe 300, and the magnetic shoe 300 is attached to the outer peripheral side surface of the rotor core 200, which is a design manner of the external magnetic shoe 300. Here, the motor in this embodiment is a permanent magnet motor, and a rotor of the permanent magnet motor generally includes a permanent magnet fixed to the rotor core 200 for providing a magnetic field, a rotor core 200, and other components, and the magnetic shoe 300 can serve as the permanent magnet after being magnetized. Specifically, the magnetic shoe 300 may be adhered to the rotor core 200 by means of an adhesive or the like. In this embodiment, the adhesive may be an anaerobic adhesive, that is, an anaerobic adhesive is disposed at a joint between the rotor core 200 and the magnetic shoe 300, and the magnetic shoe 300 is bonded to the periphery of the rotor core 200 by using the anaerobic adhesive. Of course, in other embodiments, other types of adhesive bonding may be used. In other embodiments, the magnetic shoe 300 may be mounted on the rotor core 200 in other manners, which are not limited herein.

The present application also proposes an electric machine comprising a rotor assembly as described above. The specific structure of the rotor assembly refers to the above embodiments, and since the motor adopts all technical solutions of all the above embodiments, all the beneficial effects brought by the technical solutions of the above embodiments are also achieved, and are not repeated herein.

The present application also proposes a compressor including the motor and the compression mechanism portion as described above. The motor comprises the rotor assembly, the specific structure of the rotor assembly refers to the above embodiments, and as the motor adopts all technical schemes of all the above embodiments, all beneficial effects brought by the technical schemes of the above embodiments are also achieved, and no further description is given here.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A rotor assembly, comprising:

the rotor iron core is connected with the non-shaft-extension end and is provided with a first side surface located on one side facing the shaft-extension end and a second side surface located on one side departing from the shaft-extension end; the first side surface is provided with a plurality of first balance holes, the first balance holes are provided with integral centroids X1, the second side surface is provided with a plurality of second balance holes, and the second balance holes are provided with integral centroids X2;

the volume of the first balancing hole is smaller than the volume of the second balancing hole; in the direction perpendicular to the flat surface, the X1 and the X2 are respectively arranged on two sides of the central axis, the distances from the X1 and the X2 to the central axis are consistent, and the distance from the X1 to the plane where the flat surface is located is smaller than the distance from the X2 to the plane where the flat surface is located; in the direction parallel to the central axis, a plane passing through the center of the oblate face and perpendicular to the oblate face and the central axis is a oblate central face, and the distance from the X1 to the oblate central face is smaller than the distance from the X2 to the oblate central face.

2. The rotor assembly of claim 1 wherein a depth direction of the first balancing hole and a depth direction of the second balancing hole are both parallel to the central axis.

3. The rotor assembly of claim 1 wherein the first balancing holes and the second balancing holes have the same diameter and number, and the first balancing holes have a smaller hole depth than the second balancing holes.

4. A rotor assembly as claimed in any one of claims 1 to 3, wherein the rotor core comprises a number a of stacked first laminations and B of stacked second laminations;

the first punching sheet is provided with C first punching holes, the first punching holes corresponding to the A positions are communicated to form first through holes, and the first balance holes comprise the first through holes; d second punched holes are formed in the second punching sheet, the second punched holes corresponding to the B positions are communicated to form second through holes, and the second balance holes comprise the second through holes; A. b, C and D are both positive integers.

5. The rotor assembly of claim 4, wherein the first and second stamped sheets are of uniform thickness and the first and second punched holes are of uniform configuration; a is less than B.

6. The rotor assembly of claim 4, wherein the rotor core further comprises E stacked third laminations arranged between the first laminations and the second laminations, and the first laminations, the second laminations and the third laminations are all provided with center holes through which the rotating shaft passes.

7. The rotor assembly as recited in claim 6 wherein F third punched holes are provided in the third punched plate;

8. The rotor assembly of claim 7 wherein the F third punches are arranged in an annular array about the axis of rotation.

9. The rotor assembly of claim 4, wherein on the first punched holes, the central connecting line of the two first punched holes at the two ends is parallel to the flat surface; and on the second punching sheet, the central connecting line of the two second punching holes positioned at the two ends is parallel to the flat surface.

10. A rotor assembly as claimed in any one of claims 1 to 3, wherein the first balance hole and the second balance hole are each a sector hole gradually enlarged radially outwardly of the rotor core.

11. An electrical machine comprising a rotor assembly as claimed in any one of claims 1 to 10.

12. A compressor, characterized by comprising an electric machine according to claim 11.