Rotor, tooling equipment and motor

Abstract

The invention provides a rotor, tool equipment and a motor, and relates to the technical field of motors, and the rotor comprises a rotor shaft and a rotor iron core. The rotor iron core is sleeved on the circumferential surface of the rotor shaft; a plurality of tapered key grooves with different gradients are formed in the outer circular wall surface of the rotor shaft; a plurality of taper keys with different gradients are formed on the inner circle side of the rotor core, and the taper keys with different gradients are matched with the taper key grooves of the rotor shaft in a one-to-one mode. According to the invention, the convex structures are matched with the inclined key grooves of the rotor shaft, so that the connection between the rotor iron core and the rotor shaft is realized, and compared with the connection through the matching of a shaft hole and the rotor shaft in the prior art, the iron core deformation caused in the shaft entering process of the rotor shaft due to too large interference magnitude between the shaft hole and the rotor shaft can be avoided, and the service life of the rotor is prolonged. And the magnetic steel is extruded.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and more specifically, to a rotor, a tooling device and a motor. Background Art

[0002] The higher the motor speed, the greater the centrifugal force generated by the motor rotor, and the higher the control accuracy and stability requirements of the motor. Unstable motor output torque will affect the control accuracy of the system, causing the screws to loosen and further aggravate the mechanical vibration of the motor. Therefore, a good motor rotor structure is essential for the reliable and stable operation of the motor.

[0003] In existing motors, the rotor shaft and the shaft hole of the rotor core are directly connected by interference fit, which can easily cause the core to deform and the magnetic steel to be squeezed during the rotor shaft insertion process due to reasons such as too large interference fit. Summary of the invention

[0004] The present application is based on the inventor's discovery and understanding of the following problems and facts: the rotor shaft and the axial hole of the rotor core are directly connected through interference fit, which can easily cause deformation of the core and squeezing of the magnetic steel during the insertion process of the rotor shaft due to reasons such as excessive interference fit.

[0005] The present invention aims to solve one of the above technical problems at least to a certain extent.

[0006] According to a first aspect of the present disclosure, there is provided a rotor, characterized in that it comprises:

[0007] rotor shaft and rotor core;

[0008] The rotor core is sleeved on the circumferential surface of the rotor shaft;

[0009] The outer circumferential wall surface of the rotor shaft has a plurality of helical key grooves with different inclinations;

[0010] The rotor core is formed with a plurality of oblique keys with different inclinations on its inner circle side, and the oblique keys with different inclinations are matched one by one with the plurality of oblique key slots of the rotor shaft.

[0011] The connection is achieved by cooperating with the raised structure and the helical keyway. Compared with the prior art in which the connection is achieved by adapting the shaft hole to the rotor shaft, it is possible to avoid the excessive interference force between the shaft hole and the rotor shaft, which may cause deformation of the iron core and squeezing of the magnetic steel during the insertion of the rotor shaft.

[0012] In some embodiments, the rotor core includes a plurality of rotor punchings stacked together axially along the rotor shaft; a through hole is formed in the middle portion of each of the rotor punchings, and the through holes of the plurality of rotor punchings are stacked together axially along the rotor to form an axial hole for the rotor shaft to pass through; each of the rotor punchings is formed with a plurality of protruding structures protruding toward the inside of the axial hole and having different inclinations on the inner periphery of the axial hole, and the protruding structures of the plurality of rotor punchings are stacked together axially along the rotor to form a plurality of oblique keys with different inclinations.

[0013] In some embodiments, both side surfaces of the protruding structure along the circumference of the rotor punching sheet are inclined surfaces, and the inclination a of the inclined surfaces is the same as the inclination b of the inclined key.

[0014] The finally formed oblique key can have a smoother side surface, the oblique key can be better matched with the oblique key slot, the force on the oblique key can be more uniform, and the service life of the entire oblique key can be improved.

[0015] In some embodiments, the rotor punching sheet has a plurality of long strip-shaped magnetic steel holes arranged at intervals along its circumference;

[0016] The magnetic steel holes are distributed in pairs, and each pair of the magnetic steel holes are arranged relatively inclined.

[0017] It can reduce electromagnetic cogging torque, reduce motor loss, improve motor efficiency, and at the same time reduce torque fluctuation and motor vibration noise.

[0018] In some embodiments, the ends of each pair of magnetic steel holes that are close to each other are closer to the center of the rotor punching sheet than the ends that are away from each other;

[0019] And the inclination angle formed between each pair of the magnetic steel holes is greater than 90 degrees.

[0020] It can reduce electromagnetic cogging torque, reduce motor loss, improve motor efficiency, and at the same time reduce torque fluctuation and motor vibration noise.

[0021] In some embodiments, the rotor core further comprises: magnetic steel;

[0022] The rotor punchings are stacked together along the axial direction thereof, so that the plurality of magnetic steel holes form oblique magnetic steel slots, the oblique magnetic steel slots are distributed in pairs, and each pair of the oblique magnetic steel slots are arranged relatively obliquely;

[0023] The magnetic steel is adapted to the inclined magnetic steel slot and embedded in the inclined magnetic steel slot.

[0024] The inclined magnetic steel slots, in combination with the inclined magnetic steels, can reduce the electromagnetic cogging torque, reduce motor losses, improve motor efficiency, and at the same time reduce torque fluctuations and motor vibration noise.

[0025] In some embodiments, the rotor core further comprises: a plurality of positioning inclined columns;

[0026] The rotor punchings are stacked together along the axial direction thereof, so that the plurality of positioning holes form a positioning oblique hole, and the positioning oblique hole is located radially outside the first through hole corresponding to the position thereof;

[0027] Wherein, the positioning inclined column is detachably inserted into the positioning inclined hole.

[0028] The positioning inclined hole can provide insertion space for the positioning inclined column, which can provide positioning for each rotor punching

[0029] In some embodiments, the rotor punching has a plurality of first through holes between the magnetic steel hole and the shaft hole, the plurality of first through holes are evenly distributed along the circumference of the rotor punching, and at least one first through hole is provided at one end of each pair of magnetic steel holes close to each other.

[0030] The force on the rotor shaft can be reduced, heat can be dissipated through the first through hole, the temperature rise of the motor can be reduced, the material utilization rate can be improved, and the cost can be reduced.

[0031] In some embodiments, the rotor punching has one or more positioning holes between each two adjacent pairs of the magnetic steel holes, and the one or more positioning holes are located radially outside the first through holes corresponding to their positions.

[0032] The positioning hole can provide an insertion space for the positioning column and can provide a positioning function for each rotor punching.

[0033] In some embodiments, each stacked rotor punching sheet 1 is twisted at a first preset angle α with its axial direction as the rotation axis, and the skew angles of the rotor cores with different stack heights are the same.

[0034] In some embodiments, the number of the rotor punchings 1 is n, and the n rotor punchings 1 are stacked together along their axial direction. Each two adjacent rotor punchings 1 are twisted along their axial direction at a first preset angle α, and the two rotor punchings 1 located at the two axial ends are twisted along the axial direction at a second preset angle β, and the second preset angle β = α(n-1), so that the skew angles of the rotor cores with different stacking heights are the same.

[0035] According to an embodiment of the second aspect of the present invention, there is provided a tooling device for assembling the above-mentioned rotor core, comprising:

[0036] Base;

[0037] A tube body, the bottom of which is connected to the base, the upper part of which extends above the base, and the outer diameter of which is adapted to the inner diameter of the rotor punching sheet;

[0038] The tube body has a plurality of oblique key channels with different inclinations, and the oblique key channels with different inclinations are respectively used to correspond to oblique keys of different stacking heights of the rotor core, and the oblique key channels are adapted to the size and inclination of the corresponding oblique keys of the rotor core.

[0039] By arranging a plurality of inclined key channels with different inclinations on the tube body, one assembly work can be adapted to the assembly operations of rotor cores of various models, and the tooling equipment can have better applicability.

[0040] According to an embodiment of a third aspect of the present invention, there is provided a motor, comprising: a rotor shaft and the aforementioned rotor core;

[0041] The rotor core is sleeved on the circumferential surface of the rotor shaft;

[0042] The rotor shaft has a plurality of helical keyways with different inclinations;

[0043] Wherein, the oblique key of the rotor core is adapted to fit together with one of the oblique key slots of the rotor shaft.

[0044] In some embodiments, the motor further comprises: a rotor front baffle, a rotor rear baffle and a limit ring;

[0045] Wherein, the rotor core is sandwiched between the rotor front baffle and the rotor rear baffle;

[0046] The rotor shaft has a shoulder, the side of the rotor front baffle away from the rotor core abuts against the shoulder, the side of the rotor rear baffle away from the rotor core abuts against the limit ring, and the limit ring is fixedly connected to the rotor shaft.

[0047] By adding limit rings and shaft shoulders for axial positioning, the rotor core can be prevented from being squeezed and deformed, and the rotor coaxiality can be improved.

[0048] In some embodiments, the rotor front baffle and the rotor rear baffle each have a plurality of second through holes evenly distributed along the circumferential direction of the rotor core, and at least some of the second through holes correspond to the first through holes.

[0049] The second through hole on the baffle and the first through hole on the core punching sheet increase the contact area between the rotor and the air, thereby increasing heat dissipation and making the rotor lighter, saving materials and reducing costs. The second through hole is also provided with a balancing screw, which can adjust the weight of each position of the rotor front baffle and / or the rotor rear baffle to correct the dynamic balance of the rotor core.

[0050] In some embodiments, the motor is applied to an air compressor.

[0051] According to the rotor punching of the embodiment of the present invention, the protruding structure cooperates with the helical keyway of the rotor shaft to realize the connection between the rotor core and the rotor shaft. Compared with the prior art that connects by adapting the shaft hole to the rotor shaft, it can avoid the deformation of the core and the squeezing of the magnetic steel during the rotor shaft insertion process due to the large interference between the shaft hole and the rotor shaft, and can also make full use of the existing assembly process. In the existing assembly process, when the rotor punching is transferred to form the rotor core, each rotor needs to be rotated by a certain angle. Through the improvement of the rotor punching, after the rotor punching is stacked to form the rotor core, an helical key can be naturally formed, and the cooperation of the helical key and the helical keyway can also achieve a better disassembly and assembly effect.

[0052] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 is a schematic structural diagram of a rotor punching according to an embodiment of the present invention;

[0054] Figure 2 Schematic diagram of the cross-sectional structure of a rotor punch according to an embodiment of the present invention

[0055] Figure 3 is a schematic structural diagram of a rotor core according to an embodiment of the present invention;

[0056] Figure 4 is a schematic diagram of the cross-sectional structure of a rotor core according to an embodiment of the present invention;

[0057] Figure 5 is a structural schematic diagram of a transfer tool according to an embodiment of the present invention;

[0058] Figure 6 is a schematic diagram of the matching structure of a rotor core and a rotor shaft according to an embodiment of the present invention;

[0059] Figure 7 is a schematic structural diagram of a front baffle according to an embodiment of the present invention;

[0060] Figure 8 It is a schematic diagram of the unfolded structure of two rotor cores with different stacking heights according to an embodiment of the present invention.

[0061] Reference numerals

[0062] 1. Rotor punching sheet; 2. Shaft hole; 3. Protruding structure; 4. Magnetic steel hole; 5. First through hole; 6. Positioning hole; 7. Magnetic steel; 8. Oblique key; 9. Oblique magnetic steel groove; 10. Positioning oblique hole; 11. Positioning oblique column; 12. Base; 13. Tube body; 14. Oblique key channel; 15. Rotor shaft; 16. Oblique key groove; 17. Front baffle; 18. Rear baffle; 19. Shaft shoulder; 20. Limiting ring; 21. Second through hole; 22. Rotor core. DETAILED DESCRIPTION

[0063] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0064] Throughout the specification and claims, the following terms have at least the meanings explicitly associated herein, unless the context dictates otherwise. The meanings identified below do not necessarily limit the terms, but merely provide illustrative examples of the terms.

[0065] In the description of the present invention, the phrase "in one embodiment" does not necessarily refer to the same embodiment, although it may refer to the same embodiment. Similarly, the phrase "in some embodiments" as used herein, when used multiple times, does not necessarily refer to the same embodiment, although it may refer to the same embodiment. As used herein, the term "or" is an inclusive "or" operator and is equivalent to the term "and / or", unless the context clearly dictates otherwise. The term "based on" is not exclusive and allows for additional factors not described, unless the context clearly dictates otherwise. The word "exemplary" means "used as an example, instance or illustration" in this article. Any embodiment described herein as "exemplary" is not necessarily interpreted as being superior or superior to other embodiments. The scope of the present invention is limited only by the scope of the appended claims, and any examples set forth in this specification are not intended to be limiting, but only to set forth some of the many possible embodiments of the claimed invention. The various embodiments provided by the present invention should not be interpreted as limiting the scope of protection of the present invention.

[0066] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0067] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0068] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0069] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0070] In the fiercely competitive market, air compressors are one of the most important production equipment in factories. With the continuous improvement of the research and development level of air compressors, they have developed from the original traditional piston type to the current screw type. The structure and performance requirements of screw air compressors have the characteristics of high efficiency, low energy consumption and miniaturization, which also puts forward some requirements for the selection and design of their drive motors. The influence of factors such as the drive motor starting torque, torque pulsation, working efficiency, heat dissipation performance, speed regulation ability, etc. on the air compressor should be fully considered.

[0071] Screw air compressors are usually driven by permanent magnet synchronous motors. During operation, the higher the motor speed, the greater the centrifugal force generated by the motor rotor. The control accuracy and stability requirements for permanent magnet motors are also getting higher and higher. Unstable motor output torque will affect the control accuracy of the system, causing screws to loosen and further aggravate the mechanical vibration of the motor. Therefore, a good motor rotor structure is essential for the reliable and stable operation of the motor.

[0072] In the existing air compressor motor, the rotor shaft and the shaft hole of the rotor core are directly connected by interference fit. It is easy to cause the core to deform and the magnetic steel to be squeezed during the rotor shaft insertion process due to reasons such as too large interference fit.

[0073] Embodiment 1

[0074] Based on this, Figure 1-Figure 6 As shown, according to the rotor core of the embodiment of the present invention, the rotor core is used to be connected to the rotor shaft 15, and the circumferential surface of the rotor shaft 15 has a plurality of helical key slots 16 with different inclinations, including:

[0075] A plurality of rotor punchings 1, wherein a shaft hole 2 for the rotor shaft 15 to pass through is provided in the middle of the rotor punching 1, and a protrusion structure 3 protruding toward the inner side of the shaft hole 2 is formed on the inner periphery of the shaft hole 2 of the rotor punching 1;

[0076] The plurality of rotor punching sheets 1 are stacked together along the axial direction to form the rotor core, and the protruding structure 3 is provided with an oblique key 8 on the inner diameter of the rotor core, and the oblique key 8 is used to cooperate with at least one oblique key slot 16 of the rotor shaft 15 .

[0077] Specifically, the rotor core is formed by stacking a plurality of rotor punching sheets 1, and the rotor core is sleeved on the rotor shaft 15 through the axial hole 2 in the center of the rotor punching sheet 1, and is connected to the rotor shaft 15, so that the rotor shaft 15 can drive the rotor core to select.

[0078] The protruding structure 3 on the rotor punching sheet 1 can be a rectangular protrusion, and each protruding structure 3 is adapted to the oblique keyway 16 of the rotor shaft 15, so that the rotor core and the rotor shaft 15 are connected. The connection is achieved by cooperating with the protruding structure 3 and the oblique keyway 16. Compared with the prior art in which the connection is achieved by adapting the shaft hole 2 to the rotor shaft 15, the interference force between the shaft hole 2 and the rotor shaft 15 is too large, which can avoid the deformation of the core and the squeezing of the magnetic steel 7 during the insertion of the rotor shaft.

[0079] Among them, since each rotor will select a certain angle during the process of stacking the rotor punching sheets 1 to form the rotor core, after multiple rotor punching sheets 1 are stacked, the protruding structures 3 are superimposed on each other to form an oblique key 8, and the oblique key 8 cooperates with the oblique key slot 16. Through the adaptation of the oblique key 8 and the oblique key slot 16, the rotor core and the rotor shaft 15 can be stably connected, so that the rotor shaft 15 can drive the rotor core to rotate.

[0080] According to the motor rotor of the embodiment of the present invention, the protruding structure 3 cooperates with the helical keyway 16 of the rotor shaft 15 to realize the connection between the rotor core and the rotor shaft 15. Compared with the prior art that the shaft hole 2 is adapted to connect with the rotor shaft 15, it can avoid the shaft hole 2 and the rotor shaft 15 from deforming the core and squeezing the magnetic steel 7 during the rotor shaft insertion process due to reasons such as too large interference fit. In addition, the existing assembly process can be fully utilized. In the existing assembly process, when the rotor punching sheets 1 are transferred to form the rotor core, each rotor needs to be rotated by a certain angle. By improving the rotor punching sheets 1, after the rotor punching sheets 1 are stacked to form the rotor core, a helical key 8 is naturally formed. The helical key 8 cooperates with the helical keyway 16 to achieve a better disassembly and assembly effect.

[0081] In some embodiments, both side surfaces of the protruding structure 3 along the circumferential direction of the rotor punching sheet 1 are inclined surfaces, and the inclination a of the inclined surfaces is the same as the inclination b of the inclined key 8 .

[0082] Specifically, since the bevel key 8 is gradually stacked along the axial direction after each rotor punching 1 is rotated by a preset angle and is finally formed by the raised structure 3, there will be a "step" of a certain height between each two adjacent rotor punchings 1, and the two side surfaces of the raised structure 3 proposed in the present application in the circumferential direction of the rotor punching 1 are inclined surfaces with the same inclination as the bevel key 8, so that the finally formed bevel key 8 can have a smoother side surface, so that the bevel key 8 can better cooperate with the bevel key groove 16, and the side sharp corners of each raised structure 3 are in contact with the bevel key groove 16 to be in contact with the bevel key groove 16, which can also make the force on the bevel key 8 more uniform, thereby improving the service life of the entire bevel key 8.

[0083] In some embodiments, the rotor punching sheet 1 has a plurality of long strip-shaped magnetic steel holes 4 arranged at intervals along its circumference;

[0084] The magnetic steel holes 4 are distributed in pairs, and each pair of magnetic steel holes 4 are arranged relatively tilted.

[0085] Specifically, the magnetic steel holes 4 are arranged in pairs and tilted in this way, and the magnetic steels 7 can also be arranged in pairs and tilted in two, which can reduce the electromagnetic cogging torque, reduce motor losses, improve motor efficiency, and at the same time reduce torque fluctuations and motor vibration noise.

[0086] In some embodiments, the ends of each pair of magnetic steel holes 4 that are close to each other are closer to the center of the rotor punching sheet than the ends that are away from each other;

[0087] And the inclination angle formed between each pair of magnetic steel holes is greater than 90 degrees.

[0088] Specifically, the specific setting of the magnetic steel hole 4 is that the end that is close to each other is closer to the center of the rotor punching 1, forming a "V"-shaped profile. Through this unique setting method, the electromagnetic cogging torque can be reduced, the motor loss can be reduced, the motor efficiency can be improved, and the torque fluctuation can be reduced, and the motor vibration noise can be reduced.

[0089] In some embodiments, the rotor core further comprises: magnetic steel;

[0090] The rotor punchings are stacked together along the axial direction, so that the multiple magnetic steel holes 4 form oblique magnetic steel slots 9, the oblique magnetic steel slots 9 are distributed in pairs, and each pair of oblique magnetic steel slots 9 is relatively inclined;

[0091] The magnetic steel 7 is adapted to the inclined magnetic steel slot 9 and embedded in the inclined magnetic steel slot 9 .

[0092] Specifically, the inclined magnetic steel slots 9 are arranged obliquely and cooperate with the inclined magnetic steel to reduce the electromagnetic cogging torque, reduce motor losses, improve motor efficiency, and reduce torque fluctuations and motor vibration noise.

[0093] In some embodiments, the rotor core further comprises: a plurality of positioning inclined columns 11;

[0094] The rotor punching sheets 1 are stacked together along the axial direction thereof, so that the plurality of positioning holes 6 form a positioning oblique hole 10, and the positioning oblique hole 10 is located radially outside the first through hole 5 corresponding to its position;

[0095] The oblique positioning column 11 is detachably inserted into the oblique positioning hole 10 .

[0096] Specifically, the positioning inclined hole 10 can provide an insertion space for the positioning inclined column 11 , and can provide a positioning function for each rotor punching sheet 1 .

[0097] In some embodiments, the rotor punching 1 has a plurality of first through holes 5 between the magnetic steel hole 4 and the shaft hole 2 , the plurality of first through holes 5 are evenly distributed along the circumference of the rotor punching 1 , and at least one first through hole is provided at one end of each pair of magnetic steel holes 4 close to each other.

[0098] Specifically, the first through holes 5 are evenly distributed along the circumference of the rotor punching 1. The first through holes 5 can not only reduce the mass of the rotor punching 1 and reduce the stress on the rotor shaft 15, but also dissipate heat through the first through holes 5, reduce the temperature rise of the motor, and improve material utilization and reduce costs.

[0099] In some embodiments, the rotor punching 1 has one or more positioning holes 6 between every two adjacent pairs of magnetic steel holes 4, and the one or more positioning holes 6 are located radially outside the first through hole corresponding to the position thereof.

[0100] Specifically, the positioning hole can provide an insertion space for the positioning column, and can provide a positioning function for each rotor punching sheet 1.

[0101] In some embodiments, the rotor core is formed by stacking a plurality of rotor punching sheets 1, and each rotor punching sheet 1 is rotated at a certain angle during the stacking process, so that the plurality of protrusion structures 3 can be tilted and stacked together to form an inclined key 8 with a certain inclination, and the inclined key 8 is adapted to the inclined key slot 16, and the connection between the rotor core and the rotor shaft 15 can be completed through the inclined key 8 and the inclined key slot 16, and it is no longer necessary to connect through the shaft hole 2 and the rotor shaft 15. The shaft hole 2 and the rotor shaft 15 can be clearance-fitted, which can avoid the interference force between the shaft hole 2 and the rotor shaft 15 being too large, etc., which may cause the core to deform and the magnetic steel 7 to be squeezed during the rotor shaft insertion process.

[0102] In some embodiments, each stack of the rotor punching sheets is twisted at a first preset angle with its axial direction as the rotation axis, and the skew angles of the rotor cores with different stack heights are the same.

[0103] Specifically, rotor cores with different stacking heights have oblique keys with different inclinations, and the rotor shaft is provided with a plurality of oblique slots with different inclinations, so that one rotor shaft can be adapted to rotor cores with various stacking heights.

[0104] In some embodiments, the number of the rotor punchings is n, and the n rotor punchings 1 are stacked together along their axial direction. Each two adjacent rotor punchings are twisted along their axial direction at a first preset angle α, and the two rotor punchings located at the two axial ends are twisted along the axial direction at a second preset angle β, and the second preset angle β = α(n-1), so that the skew angles of the rotor cores with different stacking heights are the same.

[0105] Specifically, the angle of the second preset angle β can be determined according to the number of magnetic poles, and can be specifically tilted by an oblique pole distance. If there are six magnetic poles, the second preset angle β can be 60°, which can reduce temperature rise, reduce noise, and have smaller vibration.

[0106] As attached Figure 6 As shown, it is a schematic diagram of the expansion of the rotor core. When the second preset angle β is 60°, the height of the rotor core changes, which will cause the inclination of the oblique key to change. 8A in the figure is an oblique key of a rotor core with a higher stack height, and 8B in the figure is an oblique key of a rotor core with a lower stack height. The dotted line indicates that the oblique pole angles of the two rotor cores are the same.

[0107] In the process of matching the rotor shaft 15 with the rotor core, the rotor shaft 15 itself is longer than the axial distance of the rotor core. Combined with the corresponding rotor shaft in the present application having multiple helical key slots 16 with different inclinations, the rotor core proposed in the present application can be matched with the same rotor shaft even if the stacking height changes after having the helical keys, without the need to add additional corresponding rotor shafts, which saves costs and facilitates assembly.

[0108] Embodiment 2.

[0109] The embodiment of the present application further provides a tooling device, including: a tooling device for assembling the aforementioned rotor punching sheet 1 to form the aforementioned rotor core, the tooling device including:

[0110] Base 12;

[0111] A tube body 13, the bottom of which is connected to the base 12, the upper part of which extends above the base 12, and the outer diameter of the tube body 13 is adapted to the inner diameter of the rotor punching 1;

[0112] The tube body 13 has a plurality of oblique key channels 14 with different inclinations. The oblique key channels 14 with different inclinations are respectively used to correspond to oblique keys of different stacking heights of the rotor core. The oblique key channels are adapted to the size and inclination of the oblique keys of the corresponding rotor core.

[0113] Specifically, since different types of rotor cores are composed of different numbers of rotor punchings 1, and the oblique keys 8 on the inner sides of different types of rotor cores also have different inclinations, by providing multiple oblique key channels 14 with different inclinations on the tube body 13, one assembly work can be adapted to the assembly operations of various types of rotor cores, and the tooling equipment can have better applicability.

[0114] Embodiment 3

[0115] The present application also provides a motor, which includes:

[0116] The rotor shaft 15 and the aforementioned rotor core;

[0117] The rotor core is sleeved on the circumferential surface of the rotor shaft 15;

[0118] The rotor shaft 15 has a plurality of helical keyways 16 with different inclinations;

[0119] The oblique key 8 of the rotor core is matched with an oblique key slot 16 of the rotor shaft 15 .

[0120] In some embodiments, the motor further includes: a rotor front baffle 17, a rotor rear baffle 18 and a limit ring 20;

[0121] The rotor core is sandwiched between the rotor front baffle 17 and the rotor rear baffle 18;

[0122] The rotor shaft 15 has a shoulder 19 , the side of the rotor front baffle 17 facing away from the rotor core abuts against the shoulder 19 , the side of the rotor rear baffle 18 facing away from the rotor core abuts against a limit ring 20 , and the limit ring 20 is fixedly connected to the rotor shaft 15 .

[0123] Specifically, the limit ring 20 can be welded to the rotor shaft 15. The rotor core is clamped by the rotor front baffle 17 and the rotor rear baffle 18, and then the rotor core is limited in the desired position by the limit ring 20 and the shaft shoulder 19. The existing rotor structure is mostly an interference fit between the rotor baffle and the rotor shaft, and the rotor core is fixed by radial force, which can easily cause the rotor to deform, the magnetic steel 7 to be squeezed and broken, and the rotor performance is poor. The present application adds a limit ring 20 and a shaft shoulder 19 for axial positioning, which can avoid the extrusion and deformation of the rotor core 22 and improve the coaxiality of the rotor.

[0124] In some embodiments, both the rotor front baffle 17 and the rotor rear baffle 18 have a plurality of second through holes 21 evenly distributed along the circumferential direction of the rotor core, and at least some of the second through holes 21 correspond to the first through holes 5 .

[0125] Specifically, the second through hole 21 on the baffle and the first through hole 5 of the core punching sheet increase the contact area between the rotor and the air, which can increase heat dissipation while making the rotor lighter, saving materials and reducing costs. The uniform distribution of the second through holes 21 and the first through holes 5 can make the mass of the rotor core the same at all locations, avoiding affecting the rotation of the rotor shaft 15. The second through holes are also provided with balancing screws, which can adjust the weight of each position of the rotor front baffle 17 and / or the rotor rear baffle 18 to correct the dynamic balance of the rotor core.

[0126] A plurality of limiting holes may be provided on the rotor punching sheet 1 , and positioning posts may be inserted into the limiting holes to assist in assembling the rotor core 22 . The positioning posts also have a certain inclination, which is the same as the inclination of the inclined key 8 .

[0127] In some embodiments, the motor is applied to an air compressor.

[0128] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0129] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A rotor, It is characterized in that include: A rotor shaft (15) and a rotor core (22); The rotor core (22) is sleeved on the circumferential surface of the rotor shaft (15); The outer circumferential wall surface of the rotor shaft (15) has a plurality of oblique key grooves (16) with different inclinations; The rotor core is provided with a plurality of oblique keys with different inclinations on its inner circle side, and the oblique keys with different inclinations are matched one by one with the plurality of oblique key slots (16) of the rotor shaft (15).

2. The rotor according to claim 1, It is characterized in that include: The rotor core (22) comprises a plurality of rotor punching sheets (1) stacked together axially along the rotor shaft (5); A through hole is formed in the middle portion of each rotor punching sheet (1), and the through holes of a plurality of rotor punching sheets (1) are stacked together along the rotor shaft (15) to form an axial hole (2) for the rotor shaft (15) to pass through; Each of the rotor punching sheets (1) is formed with a plurality of protruding structures (3) protruding toward the inside of the shaft hole (2) and having different inclinations on the inner periphery of the shaft hole (2), and the protruding structures (3) of the plurality of rotor punching sheets (1) are stacked together along the axial direction of the rotor to form the plurality of oblique keys (8) with different inclinations.

3. The rotor according to claim 2, It is characterized in that Both side surfaces of the protruding structure (3) along the circumference of the rotor punch (1) are inclined surfaces, and the inclination a of the inclined surface is the same as the inclination b of the inclined key (8).

4. The rotor according to claim 2, It is characterized in that The rotor punching sheet (1) has a plurality of long strip-shaped magnetic steel holes (4) arranged at intervals along its circumference; The magnetic steel holes (4) are distributed in pairs, and each pair of the magnetic steel holes (4) are arranged relatively inclined.

5. The rotor according to claim 4, It is characterized in that The ends of each pair of magnetic steel holes (4) that are close to each other are closer to the center of the rotor punching sheet (1) than the ends that are away from each other; and the inclination angle formed between each pair of magnetic steel holes (4) is greater than 90 degrees.

6. The rotor according to claim 5, It is characterized in that The rotor core also includes magnetic steel; The rotor punching sheets (1) are stacked together along their axial direction so that the plurality of magnetic steel holes (4) form oblique magnetic steel slots (9), the oblique magnetic steel slots (9) are distributed in pairs, and each pair of the oblique magnetic steel slots (9) are arranged relatively inclined; The magnetic steel (7) is adapted to the inclined magnetic steel slot (9) and is embedded in the inclined magnetic steel slot (9).

7. The rotor according to claim 3, It is characterized in that The rotor punching (1) has a plurality of first through holes (5) between the magnetic steel holes (4) and the shaft hole (2), the plurality of first through holes (5) are distributed along the circumference of the rotor punching (1), and at least one first through hole (5) is provided at one end of each pair of the magnetic steel holes (4) close to each other.

8. The rotor according to claim 7, It is characterized in that The rotor punching sheet (1) has one or more positioning holes (6) between each two adjacent pairs of the magnetic steel holes (4), and the one or more positioning holes (6) are located radially outside the first through hole (5) corresponding to the position thereof.

9. The rotor according to claim 8, It is characterized in that The rotor core further comprises: a plurality of inclined positioning columns (11); The rotor punching sheets (1) are stacked together along their axial direction so that a plurality of the positioning holes (6) form a positioning inclined hole (10), and the positioning inclined hole (10) is located radially outside the first through hole (5) corresponding to its position; Wherein, the positioning inclined column (11) is detachably inserted into the positioning inclined hole (10).

10. The rotor according to claim 2, It is characterized in that Each stacked rotor punch (1) is twisted with its axial direction as the rotation axis to form a first preset angle α, and the rotation angles between the rotor punches at both ends of the rotor core with different stack heights are the same.

11. The rotor according to claim 2, It is characterized in that The number of the rotor punching sheets (1) is n, and the n rotor punching sheets (1) are stacked together along their axial direction. Each two adjacent rotor punching sheets (1) are twisted along their axial direction by a first preset angle α, and the two rotor punching sheets (1) located at the two axial ends are twisted along the axial direction by a second preset angle β, and the second preset angle β=α(n-1), so that the skew angles of the rotor cores with different stacking heights are the same.

12. The rotor according to claim 11, It is characterized in that The rotor further comprises: a rotor front baffle (17), a rotor rear baffle (18) and a limiting ring (20); Wherein, the rotor core (22) is sandwiched between the rotor front baffle (17) and the rotor rear baffle (18); The rotor shaft (15) has a shaft shoulder (19), a side of the rotor front baffle (17) facing away from the rotor iron core is in abutment with the shaft shoulder (19), a side of the rotor rear baffle (18) facing away from the rotor iron core is in abutment with the limit ring (20), and the limit ring (20) is fixedly connected to the rotor shaft (15).

13. The rotor according to claim 12, It is characterized in that The rotor front baffle (17) and the rotor rear baffle (18) both have a plurality of second through holes (21) uniformly distributed along the circumferential direction of the rotor core (22), and at least some of the second through holes (21) correspond to the first through holes (5) so that the ventilation channels formed between the second through holes (21) and the first through holes are continuous, and at least some of the second through holes (21) are provided with balancing screws to correct the dynamic balance of the rotor core.

14. A tooling device for assembling a rotor according to any one of claims 1 to 13, It is characterized in that include: Base (12); A tube body (13), the bottom of the tube body (13) is connected to the base (12), the upper part of the tube body (13) extends above the base (12), and the outer diameter of the tube body (13) is adapted to the inner diameter of the rotor punching sheet (1); The tube body (13) has a plurality of oblique key channels (14) with different inclinations, and the oblique key channels (14) with different inclinations are respectively used to correspond to oblique keys (8) with different stacking heights of the rotor core, and the oblique key channels (14) are adapted to the size and inclination of the corresponding oblique keys (8) of the rotor core.

15. A motor, It is characterized in that include: A rotor as claimed in any one of claims 1 to 13.

16. The electric machine according to any one of claims 15, It is characterized in that The motor is applied to an air compressor.

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