Rotor core of self-starting quadrupole synchronous reluctance motor

Abstract

The utility model discloses a rotor iron core of a self-starting quadrupole synchronous reluctance motor, which comprises a second iron core section and a first iron core section which are laminated and riveted together, guide bar grooves of the second iron core section and the first iron core section coincide up and down, and H-shaped integrated filling groove groups of the second iron core section and the first iron core section coincide up and down. The position of the magnetic barrier cavity of the second iron core section corresponds to that of the magnetic barrier cavity of the first iron core section, a bottom punching sheet is laminated and riveted on the bottom surface of the first iron core section, a top punching sheet and a second iron core section inner hole with the same aperture are laminated and riveted on the top surface of the second iron core section, and the top punching sheet inner hole is larger than the first iron core section inner hole and the bottom punching sheet inner hole with the same aperture. And the bottom punching sheet and the top punching sheet are respectively provided with conducting bar grooves and H-shaped integrated filling groove groups which have the same structure and the same number with the first iron core section and the second iron core section and are communicated with each other. After the technical scheme is adopted, molten aluminum can be prevented from entering the magnetic barrier cavity of the first iron core section and the magnetic barrier cavity of the second iron core section when the molten aluminum is poured into the guide bar groove.

Description

Technical Field

[0001] The utility model relates to the technical field of refrigeration compressor motors, in particular to a rotor core of a self-starting four-pole synchronous reluctance motor. Background Art

[0002] The applicant's application number is 2024112035433.3, filed on August 22, 2024, and is titled "Self-Starting Four-Pole Synchronous Reluctance Motor." The simulation results show that the current is 14.76A (RMS), the motor efficiency is 88.76%, and the torque fluctuation is 26.39%. Figures 4 to 7 The rotor core is shown, and it is clearly visible that the spacing between the two ends of the magnetic barrier cavity 3 and the adjacent guide bar slots 4 is too small. When pouring molten aluminum into the guide bar slots, there is a disadvantage that molten aluminum can easily enter the magnetic barrier cavity. Specifically, since the process design of the above-mentioned spacing must meet the requirement of no more than 0.5mm, it was found in production practice that the contact surface between the casting mold and the spacing is too small to ensure that the two are completely sealed. This not only affects the efficiency of molten aluminum pouring, but also causes molten aluminum to inevitably enter the magnetic barrier cavity during pouring. Once the magnetic barrier cavity is magnetic, it affects the performance of the motor. Utility Model Content

[0003] The purpose of the utility model is to provide a rotor core for a self-starting four-pole synchronous reluctance motor, so as to solve the problem in the prior art that during the process of pouring molten aluminum into the guide groove, molten aluminum can be completely prevented from entering the magnetic barrier cavity, thereby overcoming the trouble caused by the pouring of molten aluminum in production practice and affecting the pouring efficiency.

[0004] The first technical solution provided as a way to realize the basic concept of the present invention is: a rotor core of a self-starting four-pole synchronous reluctance motor, comprising a first core segment, a second core segment stacked and riveted on the first core segment, the inner hole of the second core segment being larger than the inner hole of the first core segment, wherein the first core segment and the second core segment both have four magnetic pole sectors and in any one of the magnetic pole sectors, a plurality of magnetic barrier cavities are spaced apart along the q axis from the inner hole, each of the plurality of magnetic barrier cavities is spaced apart at both ends by a guide bar groove, an H-shaped connected filling slot group is provided between the guide bar grooves spaced apart at both ends of the magnetic barrier cavity, which consists of a plurality of radial slots and a circumferential slot that passes through two adjacent radial slots and is arranged between the slot top and the slot bottom of the radial slot, the radial slots and the guide bar slots are spaced apart at both ends by the guide bar grooves, The tops are all convex arc-shaped, and the slots are spaced circumferentially and the center lines of the slots intersect at the center of the inner hole. The guide bar slots of the second core segment and the first core segment overlap up and down, and the H-shaped one-piece filling slot group of the second core segment and the first core segment overlap up and down. The position of the magnetic barrier cavity of the second core segment corresponds to the magnetic barrier cavity of the first core segment. The improvement is that: a bottom punch is riveted on the bottom surface of the first core segment and a top punch is riveted on the top surface of the second core segment. The inner hole of the bottom punch has the same diameter as the inner hole of the first core segment and the inner hole of the top punch has the same diameter as the inner hole of the second core segment. The bottom punch and the top punch are respectively provided with guide bar slots and H-shaped one-piece filling slot groups with the same structure, equal number and communication as the first core segment and the second core segment.

[0005] As a second technical solution for realizing the basic concept of the present invention and an improvement on the aforementioned technical solution: the above-mentioned bottom punch is also provided with a magnetic barrier cavity having the same structure and an equal number as the first core segment, the top punch is also provided with a magnetic barrier cavity having the same structure and an equal number as the second core segment, and the magnetic barrier cavity of the bottom punch is interconnected with that of the first core segment, and the magnetic barrier cavity of the top punch is interconnected with that of the second core segment, and the spacing from each end of the magnetic barrier cavity of the bottom punch to the adjacent guide bar slot and the spacing from each end of the magnetic barrier cavity of the top punch to the adjacent guide bar slot are both greater than the spacing from each end of the magnetic barrier cavity of the first core segment to the adjacent guide bar slot and are both greater than the spacing from each end of the magnetic barrier cavity of the second core segment to the adjacent guide bar slot.

[0006] The bottom punch and the top punch respectively increase the aforementioned spacing, which means that the length of the magnetic barrier cavity of the bottom punch and the top punch is shortened respectively, that is, the spacing from the magnetic barrier cavity of the bottom punch to the guide bar groove of the bottom punch is increased, and the spacing from the magnetic barrier cavity of the top punch to the guide bar groove of the top punch is increased. Compared with the existing technology described in the background technology, this can also increase the sealing area between the casting mold and the aforementioned spacing, so that the casting mold can also easily complete the good shielding and sealing of the magnetic barrier cavity of the first punch and the magnetic barrier cavity of the second punch, and prevent the aluminum liquid from entering the magnetic barrier cavity of the first core segment and the magnetic barrier cavity of the second core segment respectively; when the bottom punch and the top punch are respectively provided with magnetic barrier cavities for ventilation, this optimizes the heat dissipation capacity of the rotor core compared with the aforementioned first technical solution.

[0007] As an improvement to the above two technical solutions, both ends of each magnetic barrier cavity farthest from the inner hole of the first core segment are respectively communicated with adjacent guide bar slots to form interconnected cavity slots.

[0008] Compared with the prior art involved in the background technology, the first core segment of the utility model reduces 8 guide bar slots, the current value is: 14.57A (RMS), the motor efficiency is: 89.03%, the torque fluctuation value is: 24.93%. Compared with the aforementioned prior art through simulation tests, it is shown that: the current decreases by 1.29%, the motor efficiency increases by 0.27%, and the torque fluctuation decreases by 1.46%.

[0009] The diameter of the inner hole of the second core segment is 60-70 mm, and the diameter of the inner hole of the first core segment is between 20-45 mm.

[0010] The utility model has the following advantages and positive effects:

[0011] The added bottom punch is riveted on the bottom surface of the first core segment, and the added top punch is riveted on the top surface of the second core segment, so that the bottom punch plays a role in isolating and shielding the magnetic barrier cavity of the first punch in the complete area (without opening the cavity and / or the groove) between the guide bar groove (including the H-shaped connected filling groove) and the inner hole. This area is conducive to providing sufficient pressing contact for the casting mold and thus has ample sealing area, so that a good seal can be easily achieved. Similarly, the top punch is also in the guide bar groove (including the H-shaped connected filling groove) and the inner hole. The complete area between the inner holes (without cavity and / or groove) plays the role of isolating and shielding the magnetic barrier cavity of the second punching sheet. This area is conducive to providing sufficient pressing contact for the casting mold and thus has ample sealing area. Therefore, good sealing can be easily achieved. Ultimately, during the process of pouring molten aluminum into the guide groove, the molten aluminum can be completely prevented from entering the magnetic barrier cavity of the first core segment and the magnetic barrier cavity of the second core segment, thereby ensuring the performance of the motor and solving the long-standing problems of molten aluminum pouring operation and affecting pouring efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a front view of the rotor core of the utility model;

[0013] Figure 2 This is a plan view of a top punch of an embodiment of a rotor core of the present invention;

[0014] Figure 3 is a plan view of the second punching sheet of the second core segment;

[0015] Figure 4 is a plan view of a first punching sheet of a first core segment;

[0016] Figure 5 This is a plan view of a bottom punch of an embodiment of the rotor core of the present invention;

[0017] Figure 6 This is a three-dimensional view of another embodiment of the rotor core of the present invention from one direction (the top is visible);

[0018] Figure 7 This is a top view of another embodiment of the rotor core of the present invention;

[0019] Figure 8 This is a three-dimensional diagram of another embodiment of the rotor core of the present invention from another perspective (the bottom is visible);

[0020] Figure 9 This is a plan view of a top punch of another embodiment of the rotor core of the present invention;

[0021] Figure 10 This is a plan view of a bottom punch of another embodiment of the rotor core of the present invention;

[0022] Figure 11 It is a plan view of another embodiment of the first punching sheet of the first core segment in the rotor core of the utility model. DETAILED DESCRIPTION

[0023] Please combine Figures 1 to 11 As shown, the utility model provides a rotor core of a self-starting four-pole synchronous reluctance motor.

[0024] Specifically, according to one embodiment of the present invention, see Figures 1 to 5 As shown, the rotating core includes a first core segment 1 and a second core segment 2 riveted to the top surface of the first core segment. The inner hole of the second core segment 2 is larger than the inner hole of the first core segment 1. The first core segment 1 is riveted by first punching sheets 3, and the second core segment 2 is riveted by second punching sheets 4.

[0025] The first punching sheet 3 of the first core segment 1 and the second punching sheet 4 of the second core segment 2 both have four magnetic pole sectors, and in any magnetic pole sector, a plurality of magnetic barrier cavities are spaced apart along the q axis from the inner hole, and a guide bar groove is provided at both ends of each magnetic barrier cavity in the plurality of magnetic barrier cavities, and an H-shaped connected filling slot group is provided between the guide bar grooves provided at both ends of the magnetic barrier cavity, which consists of a plurality of radial slots and a circumferential slot that passes through two adjacent radial slots and is provided between the slot top and the slot bottom of the radial slot. The groove tops of the radial grooves and guide bar grooves are all convex arc-shaped, and the grooves are spaced circumferentially and the center lines of the grooves intersect at the center of the inner hole. These have been explained in the application date of August 22, 2024, application number 2024112035433.3, and the name of the self-starting four-pole synchronous reluctance motor. The difference is that the rotor core of the patent application is made of riveted punching sheets with exactly the same structure, while the rotor core of the utility model includes a first core segment 1 and a second core segment 2 riveted together.

[0026] The guide bar grooves 42 of the second punching plate 4 completely overlap with the guide bar grooves 32 of the first punching plate 3. The H-shaped integrated filling groove group 43 of the second punching plate 4 (i.e., multiple radial grooves 43R and a circumferential groove 43C that runs through two adjacent radial grooves and is set between the groove tops and groove bottoms of the radial grooves) completely overlap with the H-shaped integrated filling groove group 33 of the first punching plate 3 (i.e., multiple radial grooves 33R and a circumferential groove 33C that runs through two adjacent radial grooves and is set between the groove tops and groove bottoms of the radial grooves). The magnetic barrier cavities 41 of the second punching plate 4 (excluding the four pairs that are disconnected) correspond in position to the magnetic barrier cavities 31 of the first punching plate 3. The spacing between each end of each magnetic barrier cavity 31 of the first punching plate 3 and the adjacent guide bar groove 32 is 0.5 mm, and the spacing between each end of each magnetic barrier cavity 41 of the second punching plate 4 and the adjacent guide bar groove 42 is 0.5 mm.

[0027] The technical points of the technical solution of the present invention are as follows: the bottom surface of the first core segment 1 is riveted with a bottom punch 5', there is at least one bottom punch 5', and in this embodiment, two bottom punches are preferably riveted; the top surface of the second core segment 2 is riveted with a top punch 6', there is at least one top punch 6', and in this embodiment, two bottom punches are preferably riveted.

[0028] The inner hole of the bottom punch 5' has the same diameter as the inner hole of the first core segment 1, while the inner hole of the top punch 6' has the same diameter as the inner hole of the second core segment 2. The inner holes of the bottom punch 5' and the first core segment 1 are press-fitted onto the rotor shaft, while the inner holes of the second core segment 2 and the top punch 6' are fitted onto the shaft sleeve of the compressor cylinder block, thus meeting the requirements for installing the self-starting four-pole synchronous reluctance motor assembled from this rotor core on a refrigeration compressor. The inner hole diameter of the second core segment 2 is 60-70 mm, while the inner hole diameter of the first core segment 1 is between 20-45 mm. The stack height of the first core segment 1 is 103 mm (sheet thickness 0.5 mm), while the stack height of the second core segment 2 is 26 mm (sheet thickness 0.5 mm). The bottom punch is 0.5 mm thick, and the top punch is 0.5 mm thick.

[0029] The bottom punch 5' is respectively provided with a guide bar groove 52' and an H-shaped one-piece filling groove group 53', and the H-shaped one-piece filling groove group 53' is composed of a plurality of radial grooves 53R' and a circumferential groove 53C' which passes through two adjacent radial grooves 53R' and is arranged between the groove top and the groove bottom of the radial groove 53R'. Similarly, the top punch 6' is respectively provided with a guide bar groove 62' and an H-shaped one-piece filling groove group 63', and the H-shaped one-piece filling groove group 63' is composed of a plurality of radial grooves 63R' and a circumferential groove 63C' which passes through two adjacent radial grooves 63R' and is arranged between the groove top and the groove bottom of the radial groove 63R'.

[0030] The guide bar groove 52' of the bottom punch 5' has the same structure, equal number and communication with the guide bar groove 32 of the first punch 3 and the guide bar groove 42 of the second punch 4 (preferably overlapping), and the H-shaped one-piece filling groove group 53' of the bottom punch 5' has the same structure, equal number and communication with the H-shaped one-piece filling groove group 33 of the first punch 3 and the H-shaped one-piece filling groove group 43 of the second punch 4 (preferably overlapping); similarly, the guide bar groove 62' of the top punch 6' has the same structure, equal number and communication with the guide bar groove 32 of the first punch 3 and the guide bar groove 42 of the second punch 4 (preferably overlapping), and the H-shaped one-piece filling groove group 63' of the top punch 6' has the same structure, equal number and communication with the H-shaped one-piece filling groove group 33 of the first punch 3 and the H-shaped one-piece filling groove group 43 of the second punch 4 (preferably overlapping).

[0031] Under the premise of the above-mentioned bottom punch 5' and top punch 6', Figures 6 to 10 In the embodiment shown, further, the bottom punch 5 is further provided with a magnetic barrier cavity 51 having the same structure and the same number as the first punch 3, and the top punch 6 is further provided with a magnetic barrier cavity 61 having the same structure and the same number as the second punch 4. Figure 1 、 Figure 3 and Figure 4The magnetic barrier cavity 51 of the bottom punch 5 is interconnected with the magnetic barrier cavity 31 of the first punch 3, and the magnetic barrier cavity 61 of the top punch 6 is interconnected with the magnetic barrier cavity 41 of the second punch 4. When the bottom punch 5 is interconnected with the first core segment 1 and the top punch 6 is interconnected with the second core segment 2, it is convenient to check whether the first core segment 1 and the second core segment 2 have infiltrated with aluminum liquid. The spacing distances from each end of the magnetic barrier cavity 51 of the bottom punch 5 to the adjacent guide bar groove 52 and the spacing distances from each end of the magnetic barrier cavity 61 of the top punch 6 to the adjacent guide bar groove 62 are respectively greater than the spacing distances from each end of the magnetic barrier cavity 31 of the first punch 3 to the adjacent guide bar groove 32 and are respectively greater than the spacing distances from each end of the magnetic barrier cavity 41 of the second punch 4 to the adjacent guide bar groove 42. In specific implementation, after the magnetic barrier cavity 51 is shortened, the spacing distance between each end of the magnetic barrier cavity 51 and the adjacent guide bar slot 52 is controlled to be between 10 and 12 mm. Similarly, after the magnetic barrier cavity 61 is shortened, the spacing distance between each end of the magnetic barrier cavity 61 and the adjacent guide bar slot 62 is controlled to be between 10 and 12 mm.

[0032] See Figure 10 Combine Figure 4 , the guide groove 52 of the bottom punch 5 completely overlaps with the guide groove 32 of the first punch 3, and the H-shaped integrated filling groove group 53 of the bottom punch 5 (i.e., multiple radial grooves 53R and a circumferential groove 53C that runs through two adjacent radial grooves and is arranged between the groove top and groove bottom of the radial groove) completely overlaps with the H-shaped integrated filling groove group 33 of the first punch 3; see Figure 9 Combine Figure 3 The guide bar groove 62 of the top punch 6 completely overlaps with the guide bar groove 42 of the second punch 4, and the H-shaped one-piece filling groove group 63 of the top punch 6 (that is, multiple radial grooves 63R and a circumferential groove 63C that passes through two adjacent radial grooves and is arranged between the groove top and the groove bottom of the radial groove) completely overlaps with the H-shaped one-piece filling groove group 43 of the second punch 4.

[0033] In such Figure 11 In the embodiment shown (the first core section of the first punching plate riveted in the embodiment is not shown), the two ends of each of the four magnetic barrier cavities farthest from the inner hole of the first punching plate 3 are respectively connected to the adjacent guide bar grooves, thereby forming interconnected cavity grooves 31-32. Figure 4 .

[0034] It should be noted that the terms in the specification and claims of this application: bottom punches 5, 5' and top punches 6, 6', are only for the convenience of description and are usually with respect to the directions shown in the drawings, and therefore cannot be interpreted as any additional limitations. Similarly, first and second are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances.

Claims

1. A rotor core of a self-starting four-pole synchronous reluctance motor, comprising a first core segment and a second core segment stacked and riveted onto the first core segment, wherein the inner hole of the second core segment is larger than the inner hole of the first core segment, wherein: The first core segment and the second core segment both have four magnetic pole sectors and in any magnetic pole sector, a plurality of magnetic barrier cavities are spaced apart along the q axis from the inner hole, and a guide bar groove is provided at both ends of each magnetic barrier cavity in the plurality of magnetic barrier cavities, and an H-shaped connected filling slot group is provided between the guide bar grooves provided at both ends of the magnetic barrier cavity, which consists of a plurality of radial slots and a circumferential slot that passes through two adjacent radial slots and is provided between the slot top and the slot bottom of the radial slot. The slot tops of the radial slots and the guide bar grooves are all convex arc-shaped, and the slots are spaced apart circumferentially and the slot center lines all intersect at the hole center of the inner hole. The second core segment and the first core segment are spaced apart circumferentially and the slot center lines all intersect at the hole center of the inner hole. The guide bar grooves of the segment overlap up and down, and the H-shaped one-piece filling slot group of the second core segment overlaps up and down with the first core segment, and the position of the magnetic barrier cavity of the second core segment corresponds to the magnetic barrier cavity of the first core segment. It is characterized in that: a bottom punch is riveted on the bottom surface of the first core segment and a top punch is riveted on the top surface of the second core segment, the inner hole of the bottom punch has the same diameter as the inner hole of the first core segment, and the inner hole of the top punch has the same diameter as the inner hole of the second core segment, and the bottom punch and the top punch are respectively provided with guide bar grooves and H-shaped one-piece filling slot groups with the same structure, equal number and communication as the first core segment and the second core segment.

2. The rotor core of the self-starting four-pole synchronous reluctance motor according to claim 1, characterized in that: The bottom punch is also provided with a magnetic barrier cavity having the same structure and an equal number as that of the first core segment, and the top punch is also provided with a magnetic barrier cavity having the same structure and an equal number as that of the second core segment, and the magnetic barrier cavities of the bottom punch and the first core segment are interconnected, and the magnetic barrier cavities of the top punch and the second core segment are interconnected, and the spacing from each end of the magnetic barrier cavity of the bottom punch to the adjacent guide bar slot and the spacing from each end of the magnetic barrier cavity of the top punch to the adjacent guide bar slot are both greater than the spacing from each end of the magnetic barrier cavity of the first core segment to the adjacent guide bar slot and are both greater than the spacing from each end of the magnetic barrier cavity of the second core segment to the adjacent guide bar slot.

3. The rotor core of the self-starting four-pole synchronous reluctance motor according to claim 2, characterized in that Two ends of each magnetic barrier cavity of the first core segment, which is farthest from the inner hole thereof, are respectively communicated with adjacent guide bar slots to form interconnected cavity slots.

4. The rotor core of the self-starting four-pole synchronous reluctance motor according to claim 1, characterized in that: The diameter of the inner hole of the second core segment is 60-70 mm, and the diameter of the inner hole of the first core segment is between 20-45 mm.

Images