Motor rotor core and self-starting quadrupole synchronous reluctance motor

Abstract

The invention discloses a motor 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 are overlapped up and down, and H-shaped integrated filling groove groups of the second iron core section and the first iron core section are overlapped 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 invention relates to the technical field of refrigeration compressor motors, and in particular to a motor rotor core and a self-starting four-pole synchronous reluctance motor. Background Art

[0002] The application number recorded by the applicant on August 22, 2024 is 2024112035433.3, and the name is self-starting four-pole synchronous reluctance motor. After simulation test, the current is 14.76A (RMS), the motor efficiency is 88.76%, and the torque fluctuation is 26.39%. Among them, Figures 4 to 7 The rotor core is shown, and it can be clearly seen 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 problem that the molten aluminum can easily enter the magnetic barrier cavity. In detail, since the process design of the above-mentioned interval must meet the requirement of not more than 0.5mm, it is found in production practice that the contact surface between the casting mold and the interval is too small to ensure that the two are completely sealed, which not only affects the efficiency of aluminum liquid pouring, but also inevitably causes aluminum liquid to enter the magnetic barrier cavity during pouring. Once the magnetic barrier cavity is magnetic, it affects the performance of the motor. Summary of the invention

[0003] The purpose of the present invention is to provide a motor rotor core to solve the problem that the molten aluminum can be completely prevented from entering the magnetic barrier cavity during the pouring of molten aluminum into the guide grooves in the prior art, thereby overcoming the troubles caused by the pouring of molten aluminum in production practice and affecting the pouring efficiency.

[0004] The first technical solution provided as a basic concept of the present invention is as follows: a motor rotor core, 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 magnetic pole sector, a plurality of magnetic barrier cavities are spaced apart along the q axis from the inner hole, and both ends of each magnetic barrier cavity in the plurality of magnetic barrier cavities are spaced apart by guide bar grooves, and an H-shaped integrated filling slot group is spaced apart 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 tops and the slot bottoms of the radial slots, and the slot tops of the radial slots and the guide bar grooves are both outwardly convex arc-shaped. , and the slots are spaced apart 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, and 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 lies in: 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 slots and H-shaped one-piece filling slot groups having the same structure, equal number and communication with the first core segment and the second core segment.

[0005] As a second technical solution to realize 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 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 groove and the spacing from each end of the magnetic barrier cavity of the top punch to the adjacent guide bar groove are both greater than the spacing from each end of the magnetic barrier cavity of the first core segment to the adjacent guide bar groove 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 groove.

[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 respectively shortened, 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 prior art described in the background technology part, this can also increase the sealing area between the casting mold and the aforementioned spacing, so 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 of the motor compared with the aforementioned first technical solution.

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

[0008] Compared with the prior art described in the background technology part, the first core segment of the present invention 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%. The simulation test comparison between the present invention and the aforementioned prior art shows 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] Another subject of the present invention also provides a self-starting four-pole synchronous reluctance motor, which includes a motor rotor core equipped with the motor rotor core according to the invention as mentioned above.

[0011] The present invention has the following advantages and positive effects:

[0012] 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 cavity and / or groove) between the guide bar groove (including H-shaped joint filling groove) and the inner hole. This area is conducive to providing sufficient pressing contact for the casting mold, so that there is sufficient sealing area, so that a good seal can be easily completed. Similarly, the top punch is also between the guide bar groove (including H-shaped joint filling groove) and the inner hole. The complete area between the inner holes (without cavity and / or groove) serves to separate and shield the magnetic barrier cavity of the second punching plate. 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 implemented. Ultimately, in 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

[0013] Figure 1 It is a front view of the rotor core of the motor of the present invention;

[0014] Figure 2 It is a plan view of a top punch of an embodiment of a motor rotor core of the present invention;

[0015] Figure 3 is a plan view of a second punching sheet of a second core segment;

[0016] Figure 4 is a plan view of a first punching sheet of a first core segment;

[0017] Figure 5 It is a plan view of a bottom punching sheet of an embodiment of a motor rotor core of the present invention;

[0018] Figure 6 It is a three-dimensional diagram of another embodiment of the motor rotor core of the present invention in one direction (the top is visible);

[0019] Figure 7 is a top view of another embodiment of the motor rotor core of the present invention;

[0020] Figure 8 is a three-dimensional diagram of another embodiment of the motor rotor core of the present invention from another perspective (the bottom is visible);

[0021] Fig. 9 is a plan view of a top punch of another embodiment of a motor rotor core of the present invention;

[0022] Fig.10 is a plan view of a bottom punching sheet of another embodiment of a motor rotor core of the present invention;

[0023] Fig.11It is a plan view of another embodiment of the first punching sheet of the first core segment in the motor rotor core of the present invention. DETAILED DESCRIPTION

[0024] Please combine Figures 1 to 11 As shown, the present invention provides a motor rotor core.

[0025] Specifically, according to an embodiment of the present invention, see Figure 1 to Figure 5 As shown, the motor rotor core includes a first core segment 1, a second core segment 2 stacked and riveted on 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 stacked and riveted by first punching sheets 3, and the second core segment 2 is stacked and riveted by second punching sheets 4.

[0026] 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 both ends of each magnetic barrier cavity in the plurality of magnetic barrier cavities are spaced apart by guide bar grooves, and an H-shaped connected filling slot group is opened 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 penetrates through two adjacent radial slots and is arranged between the slot top and the slot bottom of the radial slot, so that 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 name 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 motor rotor core of the present invention includes a first core segment 1 and a second core segment 2 riveted together.

[0027] The guide groove 42 of the second punching plate 4 completely overlaps with the guide groove 32 of the first punching plate 3; the H-shaped one-piece filling groove group 43 of the second punching plate 4 (i.e., multiple radial grooves 43R and a circumferential groove 43C that penetrates two adjacent radial grooves and is arranged between the groove top and groove bottom of the radial groove) completely overlaps with the H-shaped one-piece filling groove group 33 of the first punching plate 3 (i.e., multiple radial grooves 33R and a circumferential groove 33C that penetrates two adjacent radial grooves and is arranged between the groove top and groove bottom of the radial groove); the magnetic barrier cavity 41 of the second punching plate 4 (after removing the four pairs that are disconnected) corresponds to the position of the magnetic barrier cavity 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 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 groove 42 is 0.5 mm.

[0028] As the technical key points of the technical solution of the present invention: 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.

[0029] The inner hole of the bottom punch 5' has the same diameter as the inner hole of the first core segment 1, and the inner hole of the top punch 6' has the same diameter as the inner hole of the second core segment 2. The inner hole of the bottom punch 5' and the inner hole of the first core segment 1 are used for rotor shaft press-fitting, and the inner hole of the second core segment 2 and the inner hole of the top punch 6' are used for sleeves of the compressor cylinder seat, thereby meeting the need for the self-starting four-pole synchronous reluctance motor assembled by the rotor core of the motor to be installed on the refrigeration compressor. The aperture of the inner hole of the second core segment 2 is 60-70mm, and the aperture of the inner hole of the first core segment 1 is between 20-45mm. The stack height of the first core segment 1 is 103mm (sheet thickness 0.5mm), the stack height of the second core segment 2 is 26mm (sheet thickness 0.5mm), the sheet thickness of the bottom punch is 0.5mm, and the sheet thickness of the top punch is 0.5mm.

[0030] 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'.

[0031] The guide bar groove 52' of the bottom punch 5' has the same structure, equal number and is connected (preferably overlapped) with the guide bar groove 32 of the first punch 3 and the guide bar groove 42 of the second punch 4, and the H-shaped one-piece filling groove group 53' of the bottom punch 5' has the same structure, equal number and is connected (preferably overlapped) 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; similarly, the guide bar groove 62' of the top punch 6' has the same structure, equal number and is connected (preferably overlapped) with the guide bar groove 32 of the first punch 3 and 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' has the same structure, equal number and is connected (preferably overlapped) 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.

[0032] Based on the above-mentioned bottom punch 5' and top punch 6', Figure 6 to Figure 10In the embodiment shown, further, the bottom punch 5 is 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 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 4 The 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 the 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 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 groove 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 groove 62 is controlled to be between 10 and 12 mm.

[0033] See also Fig.10 Combination 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., a plurality of radial grooves 53R and a circumferential groove 53C that penetrates 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 integrated filling groove group 33 of the first punch 3; see Fig. 9 Combination 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, a plurality of 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.

[0034] In such Fig.11 In the embodiment shown (the first core section of the first punching sheet riveted in the embodiment is not shown), in the four magnetic barrier cavities farthest from the inner hole of the first punching sheet 3, the two ends of each magnetic barrier cavity are respectively connected to the adjacent guide grooves, thereby forming inter-connected cavity grooves 31-32. Figure 4 .

[0035] The motor rotor core of the above embodiment can be used in the technical field of refrigeration compressor motors. That is, according to another aspect of the present invention, a self-starting four-pole synchronous reluctance motor is provided, which is equipped with the above motor rotor core.

[0036] It should be noted that the terms in the specification and claims of the present application: bottom punches 5, 5' and top punches 6, 6', are only for the convenience of description and usually refer 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 are interchangeable under appropriate circumstances.

Claims

1. A motor rotor core, comprising a first core segment, and a second core segment stacked and riveted on 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, starting from the inner hole along q A plurality of magnetic barrier cavities are arranged at intervals between the shafts, and guide bar grooves are arranged at both ends of each magnetic barrier cavity in the plurality of magnetic barrier cavities, and an H-shaped connected filling groove group is arranged between the guide bar grooves arranged at both ends of the magnetic barrier cavity, which is composed of a plurality of radial grooves and a circumferential groove that penetrates through two adjacent radial grooves and is arranged between the groove tops and groove bottoms of the radial grooves, the groove tops of the radial grooves and the guide bar grooves are both convex arc-shaped, and the grooves are spaced apart along the circumferential direction and the center lines of the grooves intersect at the center of the inner hole, the guide bar grooves of the second core segment overlap with the first core segment, and the second core segment overlaps with the first core segment. The H-shaped one-piece filling slot group of the core segments overlaps up and down, 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 conductive bar grooves and an H-shaped one-piece filling slot group having the same structure, equal number and communication with the first core segment and the second core segment.

2. The motor rotor core 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 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 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 groove and the spacing from each end of the magnetic barrier cavity of the top punch to the adjacent guide bar groove are both greater than the spacing from each end of the magnetic barrier cavity of the first core segment to the adjacent guide bar groove 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 groove.

3. The motor rotor core according to claim 2, characterized in that Two ends of each magnetic barrier cavity farthest from the inner hole of the first core segment are respectively communicated with adjacent guide bar grooves to form interconnected cavity grooves.

4. The motor rotor core 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.

5. A self-starting four-pole synchronous reluctance motor, comprising a motor rotor core, characterized in that: The motor rotor core is the motor rotor core according to any one of claims 1 to 4.

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