Motor structure and reciprocating piston compressor

Abstract

The invention provides a motor structure and a reciprocating piston compressor, the motor structure comprises a rotor iron core and magnetic steels, the rotor iron core comprises a first magnetic iron core section and a second magnetic iron core section, the first magnetic iron core section is provided with a first central through hole and a plurality of magnetic steel grooves, the magnetic steels are inserted into the magnetic steel grooves in a one-to-one correspondence manner, and the second magnetic iron core section is provided with a second central through hole. The second magnetic conductive iron core section is provided with a matching hole corresponding to the first center through hole in position and a plurality of limiting structures in one-to-one correspondence with the magnetic steel grooves in position, the matching hole is used for being in interference sleeving fit with a crankshaft of the compressor pump body, and the limiting structures are used for abutting against the axial end face of the magnetic steel to achieve axial limiting of the magnetic steel. Coaxiality and cylindricity of the matching hole and the first center through hole can be guaranteed, consistency of other sizes is guaranteed, the machining yield is high, on the premise of the same axial installation space, the interference fit length between the rotor iron core and the crankshaft is longer, connection is more reliable, and the risk that the rotor iron core falls off is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of air conditioning, and in particular relates to a motor structure and a reciprocating piston compressor. Background Art

[0002] Compressor motors are trending towards miniaturization and lightweighting. High-excitation materials are used to increase motor power density, reducing motor size and overall weight. This reduction in stator and rotor height reduces the interference fit between the rotor and the compressor pump structure (crankshaft), increasing the risk of rotor shedding.

[0003] The existing structure increases the stator height and rotor height to ensure that their axial midpoints are aligned, thereby increasing the rotor mating section. However, this method will lead to an increase in the volume and weight of the entire machine, which is not suitable for industry development trends and is difficult to meet actual application needs.

[0004] If only the height of the magnetic steel is increased, it will lead to waste of motor excitation materials, poor improvement of torque density, and increased motor costs. If non-magnetic materials are used to make the fit for assembly, the coaxiality and cylindricity of the non-magnetic materials are too high, and the consistency of the rotor after assembly cannot be guaranteed. The process of installing it in the compressor is complicated, and it cannot be mass-produced and the reliability of the whole machine cannot be guaranteed. Summary of the Invention

[0005] Therefore, the present invention provides a motor structure and a reciprocating piston compressor that can overcome the technical problem in the related art that the interference fit section between the motor rotor core and the crankshaft is limited by the installation space and the length is insufficient, resulting in a high risk of the rotor core falling off.

[0006] In order to solve the above problems, the present invention provides a motor structure, including a rotor core and a magnetic steel, the rotor core including a first conductive core segment and a second conductive core segment arranged in sequence along its axial direction, the first conductive core segment is constructed with a first central through hole passing through both ends thereof for passing through a crankshaft bearing accommodating a compressor pump body assembly, and a plurality of magnetic steel slots arranged around the first central through hole, each of the magnetic steels is respectively inserted into each of the magnetic steel slots in a one-to-one correspondence, the second conductive core segment has a matching hole corresponding to the position of the first central through hole and a plurality of limiting structures corresponding to the positions of each of the magnetic steel slots in a one-to-one correspondence, the matching hole is used to fit with the interference fit of the crankshaft of the compressor pump body, and each of the limiting structures is used to interfere with the axial end face of the magnetic steel corresponding to its position to achieve axial limitation of the magnetic steel.

[0007] In some embodiments, the outer circumferential wall surface of the second magnetically permeable core segment coincides with the projection of the outer circumferential wall surface of the first magnetically permeable core segment on any radial plane of the rotor core.

[0008] In some embodiments, the second magnetic conductive core segment is further configured with a plurality of magnetic isolation grooves extending through both axial ends thereof.

[0009] In some embodiments, each of the magnetic isolation grooves and each of the magnetic steel grooves are respectively arranged in a one-to-one corresponding position, and the limiting structure is a limiting protrusion formed on the inner wall of the magnetic isolation groove.

[0010] In some embodiments, the magnetic isolation slot includes an inner slot wall located radially inward of the rotor core and an outer slot wall located radially outward of the rotor core, and the limiting protrusion is located on the inner slot wall.

[0011] In some embodiments, the outer radius of the rotor core is R, and on the projection of any radial plane of the rotor core, the magnetic isolation groove is left-right symmetrical about the first symmetry line q, and the first symmetry line q passes through the axis of the second conductive core segment. The maximum radial distance between the limiting protrusion and the inner groove wall is d, and the outer groove wall and the inner groove wall are perpendicular to the first symmetry line q. The radial distance between the outer groove wall and the axis of the second conductive core segment is r1, and the radial distance between the inner groove wall and the axis of the second conductive core segment is r2, d <r2<r1<R,0.8<(r2+d) / r1<1。

[0012] In some embodiments, the contact area between the limiting structure and the axial end surface of the magnetic steel is S, and the area of the axial end surface of the magnetic steel is W, 1%

[0013] In some embodiments, the limiting structure extends to a height h in the axial direction of the rotor core, and the magnetic isolation slot extends to a height H in the axial direction of the rotor core, where h<H.

[0014] In some embodiments, the motor structure also includes an end plate, which is located on the axial end face of the first conductive core segment facing away from the second conductive core segment, the end plate is made of non-magnetic material, and the end plate has a second center through hole, the second center through hole is mounted on the radial outer side of the crankshaft bearing, and the end plate is connected to the first conductive core segment and the second conductive core segment as a whole through an axial locking piece; and / or, the outer circumferential wall surface of the rotor core has a cutting notch passing through its two axial ends, and each of the cutting notches is respectively arranged corresponding to the left and right ends of each of the magnetic steel slots and the magnetic isolation slots.

[0015] The present invention also provides a reciprocating piston compressor comprising the above-mentioned motor structure.

[0016] The motor structure and reciprocating piston compressor provided by the present invention have the following beneficial effects:

[0017] ​The rotor core includes a first conductive core segment and a second conductive core segment which are arranged axially in sequence, wherein the first conductive core segment is mainly used to set the magnetic steel to form a magnetic flux, and the second conductive core segment replaces the conventional non-magnetic end plate structure of the rotor core. The matching hole provided on the second conductive core segment is used for the interference fit connection between the rotor core and the crankshaft. At the same time, the limiting structure on the second conductive core segment can form an axial limit on the end face of the magnetic steel, that is, the second conductive core segment has the function of interference fit connection with the crankshaft and axial limit of the magnetic steel. Since the second conductive core segment and the first conductive core segment can both adopt the same The stamping sheet of the sample material is punched and formed in an integrated manner, which can ensure the coaxiality and cylindricity of the matching hole and the first center through hole and ensure the consistency of other dimensions, and the processing yield is high. Under the premise of the same axial (axial) installation space of the rotor core, the matching hole of the rotor core in the present invention can be set longer, that is, the interference fit length between the rotor core and the crankshaft can be longer, the connection between the two is more reliable, the risk of the rotor core falling off is reduced, and the operating reliability of the equipment is improved. At the same time, the stacking height of the second conductive core segment can be flexibly selected to match the rotational inertia of products of different specifications;

[0018] The projection of the outer circumferential wall surface of the second magnetically conductive core segment on any radial plane of the rotor core coincides with the projection of the outer circumferential wall surface of the first magnetically conductive core segment on any radial plane of the rotor core, so that the rotor core can be stamped using punching sheets of the same specification, simplifying the manufacturing process while further improving the dimensional consistency after assembly;

[0019] Providing magnetic isolation grooves on the second permeable core segment can effectively reduce magnetic leakage at the end of the rotor core, increase the magnetic flux linkage value, and improve the torque output capacity of the motor;

[0020] The limiting structure is set in the slot body of the magnetic isolation slot. While the limiting structure realizes the resistance and limiting of the axial end of the magnetic steel, it effectively reduces the end leakage magnetic flux;

[0021] h<H makes the side of the magnetic isolation groove close to the magnetic steel groove objectively form another magnetic steel groove on the second conductive core segment. This can ensure that the effective length of the magnetic steel is increased while increasing the interference fit length between the second conductive core segment and the crankshaft, which is conducive to improving the utilization rate of the excitation material and the cost performance of the whole machine;

[0022] By optimizing the distance between the radial inner and outer groove walls of the magnetic isolation groove and the protrusion height of the limiting structure, it is possible to prevent the phenomenon that the distance between the limiting structure and the outer groove wall is too small, which reduces the anti-magnetic leakage effect, and the distance is too large, which reduces the axial positioning reliability of the magnetic steel.

[0023] Limiting the contact area S between the limiting structure and the axial end face of the magnet and the total area W of the axial end face of the magnet can prevent the contact area between the limiting structure and the magnet from being too large, which reduces the anti-magnetic leakage effect, and the contact area from being too small, which reduces the reliability of the axial positioning of the magnet. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. The drawings described below are merely exemplary. Those skilled in the art can, without inventive effort, derive other implementation drawings based on the provided drawings.

[0025] Figure 1 is a schematic cross-sectional view of the motor structure of the present invention;

[0026] Figure 2 yes Figure 1 A schematic structural diagram of the first punching sheet used in the first magnetic conductive core segment (axial projection);

[0027] Figure 3 yes Figure 1 A schematic structural diagram (axial projection) of a second punching sheet used in the second magnetically conductive core segment in one embodiment;

[0028] Figure 4 yes Figure 1 A schematic structural diagram (axial projection) of a second punching sheet used in another embodiment of the second magnetic conductive core segment;

[0029] Figure 5 yes Figure 1 A schematic structural diagram (axial projection) of a second punching plate used in another embodiment of the second magnetic conductive core segment, in which no magnetic isolation groove is provided on the second punching plate;

[0030] Figure 6 2 is a schematic diagram comparing the flux linkage values of the second punching sheet in the rotor core in an embodiment of the present invention when the second punching sheet is not provided with a magnetic isolation groove and when the second punching sheet is provided with a magnetic isolation groove;

[0031] Figure 7 It is a structural schematic diagram of the motor structure of the present invention and the crankshaft and bearings of the reciprocating piston compressor in an assembled state.

[0032] The accompanying drawings are:

[0033] 1. Rotor core; 11. First magnetic conductive core segment; 111. First center through hole; 112. Magnetic steel slot; 113. Trimming notch; 12. Second magnetic conductive core segment; 121. Fitting hole; 122. Limiting structure; 123. Magnetic isolation slot; 2. Magnetic steel; 3. End plate; 31. Second center through hole; 4. Rivet hole. DETAILED DESCRIPTION

[0034] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0036] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90° or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0037] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0038] See also Figures 1 to 7As shown, according to an embodiment of the present invention, a motor structure is provided, specifically a permanent magnet synchronous motor structure, including a rotor core (not labeled in the figure) and a magnetic steel 2, wherein the rotor core includes a first magnetic conductive core segment 11 and a second magnetic conductive core segment 12 arranged in sequence along its axial direction, and the first magnetic conductive core segment 11 is configured with a first central through hole 111 passing through both axial ends thereof for passing through a crankshaft bearing accommodating a compressor pump assembly, and a plurality of magnetic steel slots 112 arranged around the first central through hole 111, see Figure 2 As shown, there are six magnetic steel slots 112, and each of the magnetic steels 2 is inserted into each of the magnetic steel slots 112 in a one-to-one correspondence. The second conductive core segment 12 has a matching hole 121 corresponding to the position of the first central through hole 111 and a plurality of limiting structures 122 corresponding to the positions of each of the magnetic steel slots 112. The matching hole 121 is used to fit with the crankshaft of the compressor pump body through interference fit, thereby forming an interference fit connection between the rotor core and the crankshaft. The matching surfaces of the two form a matching segment in the axial direction. Each of the limiting structures 122 is used to interfere with the axial end face of the magnetic steel 2 corresponding to its position to achieve axial limitation of the magnetic steel 2. Specifically, Figure 1 The position shown is for reference only. The limiting structure 122 can limit the magnetic steel 2 in the axial direction. Figure 1 As shown, the second permeable core segment 12 of the present invention does not have a non-magnetic end plate on the end surface facing away from the first permeable core segment 11. It is understood that both the first permeable core segment 11 and the second permeable core segment 12 are formed from laminated silicon steel sheets. The diameter of the first central through hole 111 is larger than the outer diameter of the crankshaft bearing and larger than the diameter of the mating hole 121. It is understood that the first central through hole 111 and the mating hole 121 are preferably coaxial.

[0039] In this technical solution, the rotor core includes a first conductive core segment 11 and a second conductive core segment 12 which are arranged in sequence axially, wherein the first conductive core segment 11 is mainly used to set the magnetic steel 2 to form a magnetic flux, and the second conductive core segment 12 replaces the conventional non-magnetic end plate structure of the rotor core. The matching hole 121 provided on the second conductive core segment 12 is used for the interference fit connection between the rotor core and the crankshaft. At the same time, the limiting structure 122 on the second conductive core segment 12 can form an axial limit on the end face of the magnetic steel, that is, the second conductive core segment 12 has the function of interference fit connection with the crankshaft and axial limit of the magnetic steel 2. Since the second conductive core segment 12 is connected to the first conductive core segment 12 The magnetic core segments 11 can all be punched in one piece using punching sheets of the same material, which can ensure the coaxiality and cylindricity of the matching hole 121 and the first center through hole 111 and ensure the consistency of other dimensions. The processing yield is high. Under the premise of the same axial (axial direction of the rotor core) installation space, the matching hole 121 of the rotor core in the present invention can be set longer, that is, the interference fit length between the rotor core and the crankshaft can be longer, the connection between the two is more reliable, the risk of the rotor core falling off is reduced, and the operating reliability of the equipment is improved. At the same time, the stacking height of the second conductive core segment 12 can be flexibly selected to match the rotational inertia of products of different specifications. What is understandable is that in the prior art, a non-magnetic end plate is provided at one axial end of the rotor core. Since the material of the end plate is different from that of the rotor core punching sheet and the processing technology is different, the through hole in the center of the end plate cannot be used for interference fit with the crankshaft, and its hole diameter is often larger than the diameter of the crankshaft. Even if the through hole in the center of the end plate is used for interference fit with the crankshaft, there is still a problem of excessive difficulty in processing and assembly due to the difference in materials.

[0040] In some embodiments, the outer circumferential wall surface of the second magnetically conductive core segment 12 coincides with the projection of the outer circumferential wall surface of the first magnetically conductive core segment 11 on any radial plane of the rotor core.

[0041] In this technical solution, the outer circumferential wall surface of the second conductive core segment 12 coincides with the projection of the outer circumferential wall surface of the first conductive core segment 11 on any radial plane of the rotor core, so that the rotor core can be stamped using punching sheets of the same specification, simplifying the manufacturing process while further improving the dimensional consistency after assembly.

[0042] See Figure 5As shown, in a feasible embodiment, the aforementioned second conductive core segment 12 is a plate structure having only the aforementioned matching hole 121 and the corresponding rivet hole 4. At this time, the corresponding limiting structure 122 is objectively the plate surface of the aforementioned plate structure. However, although this structure can have the aforementioned friendly effect, the end magnetic leakage phenomenon of the rotor core is relatively serious, and the magnetic flux value of the rotor core during operation is low. In order to reduce the end magnetic leakage of the second conductive core segment 12 at the end away from the first conductive core segment 11, increase the magnetic flux value, and improve the motor torque output capacity, in some embodiments, the second conductive core segment 12 is also constructed with a plurality of magnetic isolation grooves 123 running through its two axial ends.

[0043] Depend on Figure 6 It can be concluded that after the aforementioned magnetic isolation grooves 123 are provided, the excitation capacity of the rotor core is improved by about 9.9%.

[0044] In a preferred embodiment, each of the magnetic isolation grooves 123 is disposed in one-to-one correspondence with each of the magnetic steel grooves 112 , and the limiting structure 122 is a limiting protrusion formed on the inner wall of the magnetic isolation groove 123 .

[0045] In this technical solution, the limiting structure 122 is arranged in the slot body of the magnetic isolation slot 123. While the limiting structure 122 realizes the resistance and limiting of the axial end of the magnetic steel 2, it effectively reduces the end leakage.

[0046] In some embodiments, the height of the limiting structure 122 extending in the axial direction of the rotor core is h, the height of the magnetic isolation groove 123 extending in the axial direction of the rotor core is H, h<H, and the end of the limiting structure 122 facing away from the magnetic steel 2 is located on the end surface of the second conductive core segment 12 facing away from the first conductive core segment 11. An embodiment corresponding to this technical solution is that the thickened portions of the first conductive core segment 11 and the second conductive core segment 12 that do not have the aforementioned limiting structure 122 are both Figure 2 The first punching sheets are formed by stacking, and the thick stacked portion of the second magnetic core segment 12 having the aforementioned limiting structure 122 is formed by Figure 3 The second punching sheet shown is formed by stacking.

[0047] In this technical solution, h<H makes the side of the magnetic isolation groove 123 close to the magnetic steel groove 112 objectively form another magnetic steel groove on the second conductive core segment 12. In this way, the effective length of the magnetic steel 2 can be increased while increasing the interference fit length between the second conductive core segment 12 and the crankshaft, which is beneficial to improving the utilization rate of the excitation material and the cost-effectiveness of the whole machine.

[0048] In some embodiments, the magnetic isolation slot 123 includes an inner slot wall located radially inward of the rotor core and an outer slot wall located radially outward of the rotor core, and the limiting protrusion is located on the inner slot wall.

[0049] In this technical solution, the limiting protrusion is arranged on the inner groove wall of the magnetic isolation groove 123. At this time, the outer groove wall of the magnetic isolation groove 123 can be connected with the outer circumferential wall of the rotor core, that is, the magnetic isolation groove 123 as a whole forms an opening structure with the opening facing the radial outside of the rotor core, which can further reduce the end magnetic leakage.

[0050] In some embodiments, the outer radius of the rotor core is R, and on the projection of any radial plane of the rotor core, the magnetic isolation groove 123 is bilaterally symmetrical about the first symmetry line q, and the first symmetry line q passes through the axis of the second conductive core segment 12. The maximum radial distance between the limiting protrusion and the inner groove wall is d, and the outer groove wall and the inner groove wall are perpendicular to the first symmetry line q. The radial distance between the outer groove wall and the axis of the second conductive core segment 12 is r1, and the radial distance between the inner groove wall and the axis of the second conductive core segment 12 is r2, d <r2<r1<R,0.8<(r2+d) / r1<1。

[0051] In this technical solution, by optimizing the design of the radial inner and outer groove wall distances of the magnetic isolation groove 123 and the protruding height of the limiting structure 122, it is possible to prevent the distance between the limiting structure 122 and the outer groove wall from being too small, thereby reducing the anti-magnetic leakage effect, and the distance from being too large, thereby reducing the axial positioning reliability of the magnet 2.

[0052] The specific shape of the aforementioned limiting structure 122 can be various, for example, Figure 2 The rectangle in Figure 5 The semicircle in the figure can of course be other shapes, and the present invention does not make any special limitation thereto.

[0053] In some embodiments, the contact area between the limiting structure 122 and the axial end surface of the magnetic steel 2 is S, and the area of the axial end surface of the magnetic steel 2 is W, 1%

[0054] In this technical solution, the contact area S between the limiting structure 122 and the axial end face of the magnet 2 and the total area W of the axial end face of the magnet 2 are limited, which can prevent the contact area between the limiting structure 122 and the magnet 2 from being too large, thereby reducing the anti-magnetic leakage effect, and the contact area from being too small, thereby reducing the axial positioning reliability of the magnet 2.

[0055] ​In some embodiments, the motor structure further includes an end plate 3, which is located on the axial end surface of the first conductive core segment 11 away from the second conductive core segment 12, and the material of the end plate 3 is a non-magnetic material, and the end plate 3 has a second central through hole 31, and the second central through hole 31 is sleeved on the radial outer side of the crankshaft bearing, that is, the aperture of the second central through hole 31 is larger than the outer diameter of the crankshaft bearing, so that an annular gap is formed between the two, and the end plate 3 is connected to the first conductive core segment 11 and the second conductive core segment 12 as a whole through an axial locking member, and the front The axial locking member can specifically be a rivet, a screw, etc. At this time, rivet holes 4 (or screw holes) are formed at corresponding positions on the aforementioned end plate 3 and the aforementioned first conductive core segment 11 and the second conductive core segment 12. The rivets are respectively connected to the entire rotor core and the end plate 3 through the aforementioned rivet holes 4. It can be understood that since the first conductive core segment 11 and the end plate 3 do not need to have an interference fit with the crankshaft bearing, the requirements for installation and processing accuracy do not need to be too high. The end plate 3 set on this side can be made of stainless steel with a smaller thickness, which can meet the purpose of compact design of the compressor.

[0056] As another feasible implementation, when the axial installation space of the rotor core is relatively ample, a third conductive core segment (not shown in the figure and not labeled) is provided on the end face of the first conductive core segment 11 away from the second conductive core segment 12. The third conductive core segment is also formed by stacking silicon steel punching sheets, and the rotational inertia of the rotor core can be adjusted by adjusting the stacking height.

[0057] See Figure 2 and Figure 3 As shown, the outer circumferential wall surface of the rotor core has a trimming notch 113 that passes through its two axial ends. Each trimming notch 113 is respectively arranged corresponding to the left and right ends of each magnetic steel slot 112 and the magnetic isolation slot 123, so as to reduce inter-pole leakage, improve motor efficiency, and improve air gap magnetic density, so that the motor operation is more stable.

[0058] According to an embodiment of the present invention, a reciprocating piston compressor is further provided, comprising the above-mentioned motor structure.

[0059] It is easy for those skilled in the art to understand that, under the premise of no conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0060] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention. The above description is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and variations without departing from the technical principles of the present invention, and such improvements and variations shall also be considered within the scope of protection of the present invention.

Claims

1. A motor structure comprising a rotor core and a magnetic steel (2), characterized in that: The rotor core comprises a first conductive core segment (11) and a second conductive core segment (12) arranged in sequence along its axial direction. The first conductive core segment (11) is constructed with a first central through hole (111) passing through both ends thereof for passing through a crankshaft bearing accommodating a compressor pump assembly, and a plurality of magnetic steel slots (112) arranged around the first central through hole (111). Each of the magnetic steels (2) is respectively inserted into each of the magnetic steel slots (112) in a one-to-one correspondence. The second conductive core segment (12) is provided with a matching hole (121) corresponding to the position of the first central through hole (111) and a plurality of limiting structures (122) corresponding to the position of each of the magnetic steel slots (112). The matching hole (121) is used for interference fitting with the crankshaft of the compressor pump body, and each limiting structure (122) is used for contacting the axial end face of the magnetic steel (2) corresponding to its position to achieve axial limiting of the magnetic steel (2).

2. The motor structure according to claim 1, characterized in that: The projection of the outer circumferential wall surface of the second magnetically conductive core segment (12) coincides with the projection of the outer circumferential wall surface of the first magnetically conductive core segment (11) on any radial plane of the rotor core.

3. The motor structure according to claim 2, characterized in that: The second magnetic conductive core segment (12) is also provided with a plurality of magnetic isolation grooves (123) extending through both axial ends thereof.

4. The motor structure according to claim 3, characterized in that: Each of the magnetic isolation grooves (123) and each of the magnetic steel grooves (112) are respectively arranged in a one-to-one corresponding position, and the limiting structure (122) is a limiting protrusion formed on the inner wall of the magnetic isolation groove (123).

5. The motor structure according to claim 4, characterized in that: The magnetic isolation groove (123) comprises an inner groove wall located on the radial inner side of the rotor iron core and an outer groove wall located on the radial outer side of the rotor iron core, and the limiting protrusion is located on the inner groove wall.

6. The motor structure according to claim 5, characterized in that: The outer radius of the rotor core is R. On the projection of any radial plane of the rotor core, the magnetic isolation groove (123) is bilaterally symmetrical about a first symmetry line q, the first symmetry line q passes through the axis of the second conductive core segment (12), the radial maximum distance between the limiting protrusion and the inner groove wall is d, and the outer groove wall and the inner groove wall are perpendicular to the first symmetry line q, the radial distance between the outer groove wall and the axis of the second conductive core segment (12) is r1, the radial distance between the inner groove wall and the axis of the second conductive core segment (12) is r2, and d <r2<r1<R,0.8<(r2+d) / r1<1。 7. The motor structure according to claim 1, characterized in that: The contact area between the limiting structure (122) and the axial end surface of the magnetic steel (2) is S, the area of the axial end surface of the magnetic steel (2) is W, the height of the limiting structure (122) extending in the axial direction of the rotor core is h, and the height of the magnetic isolation groove (123) extending in the axial direction of the rotor core is H, where h<H.

8. The motor structure according to claim 1, characterized in that: ​ 9. The motor structure according to claim 1, characterized in that: The invention also includes an end plate (3), which is located on the axial end face of the first conductive core segment (11) away from the second conductive core segment (12), and the material of the end plate (3) is non-magnetic material, and the end plate (3) has a second central through hole (31), and the second central through hole (31) is sleeved on the radial outer side of the crankshaft bearing, and the end plate (3) is connected to the first conductive core segment (11) and the second conductive core segment (12) as a whole through an axial locking member; and / or, the outer circumferential wall surface of the rotor core has a cutting notch (113) passing through its two axial ends, and each of the cutting notches (113) is respectively arranged corresponding to the left and right ends of each of the magnetic steel slots (112) and the magnetic isolation slot (123).

10. A reciprocating piston compressor, characterized in that: The motor structure comprises the motor structure according to any one of claims 1 to 9.

Images