Motor rotor and self-starting synchronous reluctance motor

Abstract

The application provides a motor rotor and a self-starting synchronous reluctance motor. The motor rotor comprises a rotor lamination (1), and a D-axis magnetic barrier slot is arranged on the rotor lamination (1). The D-axis magnetic barrier slot comprises filled slots (2) at two ends and non-filled slots (3) in the middle. The filled slots (2) and the non-filled slots (3) are spaced apart by inner magnetic bridges (4). The inner magnetic bridges (4) are circular arc structures with the center of the rotor lamination (1) as the center. The rotor laminations (1) are concentrically arranged and are stacked in a circumferential direction with a preset angle offset to form an inclined pole rotor. According to the motor rotor, the problem that the filled material enters the non-filled slots of the motor rotor of the inclined pole motor during the casting of aluminum can be avoided, and the reliability of the motor rotor is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to an electric machine rotor and a self-starting synchronous reluctance electric machine. BACKGROUND

[0002] The self-starting synchronous reluctance electric machine has the characteristics of both asynchronous electric machines and synchronous reluctance electric machines, and has the following basic characteristics:

[0003] 1. An air slot is formed in the rotor along the axial direction, the air slot is referred to as a magnetic barrier slot, and the part of the iron core formed between every two layers of magnetic barrier slots is referred to as a magnetic flux guide channel;

[0004] 2. The magnetic barrier slot is filled with electrically conductive and magnetically non-conductive material (for example, aluminum) in whole or in part, which is referred to as a bar;

[0005] 3. The rotor has end rings at the two axial ends, the material of the end rings is the same as that of the bars, the end rings at the two ends of the rotor are connected with all or part of the bars in the rotor slot to form a short-circuit loop;

[0006] 4. Each pole of the rotor forms two symmetrical axes D-axis and Q-axis, the axis approximately parallel to the magnetic flux guide channel is referred to as the D-axis, and the axis approximately perpendicular to the magnetic flux guide channel is referred to as the Q-axis.

[0007] The self-starting synchronous reluctance electric machine has the advantages of both asynchronous electric machines and synchronous reluctance electric machines, i.e., the asynchronous electric machine can be directly started without a frequency converter, the rotor has no magnetic steel, and the reliability is high, and the synchronous reluctance electric machine has the advantages of stable operation in synchronization, high efficiency, and high power density. In the industrial field, the IE4 energy efficiency of the fixed-frequency electric machine is broken through, and the cost is lower.

[0008] The magnetic barrier of the self-starting synchronous reluctance electric machine is divided into filled slots and unfilled slots, the filled slots are filled with electrically conductive and magnetically non-conductive material, and the filled slots and the unfilled slots are separated by an inner magnetic bridge.

[0009] Unlike asynchronous electric machines, the filled slots have a structure parallel or approximately parallel to the D-axis, and when the rotor has an inclined pole arrangement, i.e., the rotor lamination is staggered by an angle along the axial direction, the filled slots and the unfilled slots are staggered, i.e., the filled material can enter the unfilled slots. SUMMARY

[0010] Therefore, the technical problem to be solved by the present application is to provide an electric machine rotor and a self-starting synchronous reluctance electric machine, which can avoid the problem of the filled material entering the unfilled slots of the electric machine rotor of the inclined pole electric machine during the casting of aluminum, and improve the reliability of the electric machine rotor.

[0011] To solve the above problems, the application provides a motor rotor, comprising a rotor lamination, wherein a D-axis magnetic barrier slot is arranged on the rotor lamination, the D-axis magnetic barrier slot comprises a filled slot at both ends and a non-filled slot in the middle, the filled slot and the non-filled slot are separated by an inner magnetic bridge, the inner magnetic bridge is a circular arc structure with the center of the rotor lamination as the center, the rotor laminations are arranged concentrically and are stacked with a preset angle staggered in the circumferential direction to form an inclined pole rotor.

[0012] Preferably, the non-filled slot comprises a first circular arc segment, and the first circular arc segment is a concentric circular arc with the center of the rotor lamination as the center.

[0013] Preferably, the central angle of the first circular arc segment is AT, the inclined pole angle of the motor rotor is Amax, and AT>Amax.

[0014] Preferably, A T > (2x A max +3°), wherein Ns is the number of stator slots.

[0015] Preferably, the first circular arc segment is symmetric about the Q-axis.

[0016] Preferably, the two ends of the first circular arc segment are respectively provided with a second circular arc segment, and the second circular arc segment is connected with the first circular arc segment; or, the two ends of the first circular arc segment are respectively provided with a straight line segment, and the straight line segment extends in a direction parallel to the D-axis.

[0017] Preferably, the two ends of the first circular arc segment are respectively provided with a second circular arc segment, and the second circular arc segment is connected with the first circular arc segment, a straight line segment is connected to one end of the second circular arc segment away from the first circular arc segment, and the length of the straight line segment decreases along the Q-axis direction.

[0018] Preferably, the diameters of the inner magnetic bridges increase along the Q-axis direction.

[0019] Preferably, the diameters of the inner magnetic bridges are the same.

[0020] Preferably, the rotor lamination is further provided with a Q-axis magnetic barrier slot, and the Q-axis magnetic barrier slot is located outside the D-axis magnetic barrier slot in the Q-axis direction.

[0021] Preferably, the filled slot is filled with an electrically conductive and magnetically non-conductive material.

[0022] According to another aspect of the application, a self-starting synchronous reluctance motor is provided, comprising a motor rotor, which is the above-mentioned motor rotor.

[0023] The motor rotor provided by the application comprises rotor punching sheets, and the rotor punching sheets are provided with D-axis magnetic barrier grooves, the D-axis magnetic barrier grooves comprise filling grooves at two ends and non-filling grooves in the middle, the filling grooves and the non-filling grooves are separated by inner magnetic bridges, the inner magnetic bridges are circular arc structures with the center of the rotor punching sheet as the center, the rotor punching sheets are concentrically arranged and are stacked to form an inclined pole rotor by being staggered by a preset angle in the circumferential direction. In the rotor punching sheet of the motor rotor, the inner magnetic bridges between the filling grooves and the non-filling grooves adopt the circular arc structure with the center of the rotor punching sheet as the center, and in the process of stacking the rotor punching sheets, the inner magnetic bridges are rotated by a certain angle relative to the center of the rotor punching sheet, so that the inner magnetic bridges at the corresponding positions are always in the overlapping state, the filling grooves and the non-filling grooves can be always isolated, and the interlacing phenomenon does not occur, so that the filling material can be effectively prevented from entering the non-filling grooves in the process of casting aluminum, and the reliability of the motor rotor is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0024] Fig. 1 A structure schematic diagram of the rotor punching sheet of the motor rotor of an embodiment of the application;

[0025] Fig. 2 A structure schematic diagram of the inner magnetic bridge of the rotor punching sheet of the motor rotor of an embodiment of the application;

[0026] Fig. 3 A structure schematic diagram of the motor rotor of an embodiment of the application.

[0027] The reference signs are as follows:

[0028] 1, rotor punching sheet; 2, filling groove; 3, non-filling groove; 4, inner magnetic bridge; 5, first circular arc segment; 6, second circular arc segment; 7, straight line segment; 8, Q-axis magnetic barrier groove. DETAILED DESCRIPTION

[0029] For reference Figs. 1-3 As shown in the figure, according to the embodiment of the application, the motor rotor comprises rotor punching sheets 1, the rotor punching sheets 1 are provided with D-axis magnetic barrier grooves, the D-axis magnetic barrier grooves comprise filling grooves 2 at two ends and non-filling grooves 3 in the middle, the filling grooves 2 and the non-filling grooves 3 are separated by inner magnetic bridges 4, the inner magnetic bridges 4 are circular arc structures with the center of the rotor punching sheet 1 as the center, the rotor punching sheets 1 are concentrically arranged and are stacked to form an inclined pole rotor by being staggered by a preset angle in the circumferential direction.

[0030] The inner magnetic bridge 4 between the filled slot 2 and the non-filled slot 3 adopts a circular arc structure with the center of the rotor sheet 1 as the center, and during the lamination of the rotor sheet 1, the inner magnetic bridge 4 is rotated by a certain angle relative to the center of the rotor sheet 1, so that the inner magnetic bridge 4 at the corresponding position is always in an overlapping state, which can isolate the filled slot 2 and the non-filled slot 3 at all times and prevent the slots from being staggered, thereby effectively preventing the filling material from entering the non-filled slot 3 during the casting process, and ensuring the reliability of the motor rotor.

[0031] In the embodiment, the multi-layer D-axis magnetic barrier slots are arranged along the Q-axis direction, and a magnetic flux channel is formed between adjacent D-axis magnetic barrier slots.

[0032] The plurality of rotor sheets 1 are stacked along the axial direction, and each rotor sheet 1 is offset by a certain angle relative to the previous rotor sheet 1, thereby forming a rotor core with a skew pole angle.

[0033] The rotor core is provided with a plurality of groups of magnetic barrier slots, and the groups of magnetic barrier slots are arranged along the circumferential direction, and the number of groups of magnetic barrier slots is equal to the number of rotor poles.

[0034] In the embodiment, the filled slot 2 of the D-axis magnetic barrier slot is filled with a conductive and non-magnetic material to form a conductive bar, and the rotor core has an end ring made of a conductive and non-magnetic material at both ends, which is connected to the conductive bar to form a short circuit structure. All or part of the conductive bars are short-circuited together through the end ring to form a loop. The non-filled slot 2 is not filled with a conductive and non-magnetic material, and is an air slot structure. Therefore, by changing the structure of the inner magnetic bridge 4, the inner magnetic bridge 4 can effectively separate the filled slot 2 and the non-filled slot 3 during the lamination of the rotor sheet 1 to form a skew pole rotor, thereby effectively preventing the conductive and non-magnetic material from entering the non-filled slot 3 from the filled slot 2 during the filling of the conductive and non-magnetic material, and improving the reliability of the motor rotor during the filling of the conductive and non-magnetic material.

[0035] The conductive and non-magnetic material can be aluminum or red copper, etc. For convenience of description, the following description uses cast aluminum instead of filling the conductive and non-magnetic material.

[0036] In one embodiment, the non-filled slot 3 comprises a first circular arc segment 5, which is a concentric circular arc with the center of the rotor lamination 1 as the center. In this embodiment, by setting one segment of the non-filled slot 3 as a concentric circular arc with the center of the rotor lamination 1 as the center, the rotor lamination 1 can still have at least part of the first circular arc segment 5 completely overlapped during the lamination process. Therefore, even if each rotor lamination 1 is misaligned by a certain angle during the aluminum casting process, the overlapping part of the first circular arc segment 5 can still be unaffected by the skewing of the rotor lamination 1, providing installation space for the aluminum casting support tooling. Even if the rotor lamination 1 is rotated by a certain angle, the tooling can still be placed without affecting the tooling, so that the support tooling can be placed to balance the pressure during the aluminum casting process, ensuring the smooth completion of the aluminum casting process, while avoiding deformation of the motor rotor during the aluminum casting process and improving the stability of the motor rotor structure.

[0037] In one embodiment, with the first layer of rotor laminations 1 as the reference, the maximum misalignment angle of the rotor lamination 1 relative to the first layer of rotor laminations 1 is referred to as the rotor skewing angle, which is Amax, and the smallest central angle of the protruding part of the air slot is AT, AT > Amax, thereby ensuring that at least part of the first circular arc segment 5 is completely overlapped during the axial skewing of the rotor lamination 1, further improving the rationality of the design of the rotor lamination 1, ensuring the effective use of the support tooling during the formation of the skewing rotor, reducing the difficulty of aluminum casting of the skewing rotor, and ensuring the quality of aluminum casting of the skewing rotor.

[0038] In one embodiment, A T > (2 x A max + 3°), where Ns is the number of stator slots, thereby correlating the rotor skewing angle and the number of magnetic barrier slots, so that the mutual misalignment of the rotor laminations 1 does not affect the aluminum casting.

[0039] In one embodiment, the first circular arc segment 5 is symmetrical about the Q-axis, making it easier to set the support tooling, and also ensuring that the support tooling provides uniform support force on both sides when the support tooling is installed, improving the structural consistency.

[0040] In one embodiment, the two ends of the first circular arc segment 5 are respectively provided with a second circular arc segment 6, and the second circular arc segment 6 is connected with the first circular arc segment 5. In this embodiment, the entire non-filled slot 3 can be partially formed by the first circular arc segment 5, partially formed by the combination of the first circular arc segment 5 and the second circular arc segment 6, or entirely formed by the combination of the first circular arc segment 5 and the second circular arc segment 6.

[0041] In one embodiment, the two ends of the first arc segment 5 are respectively provided with a straight line segment 7, which extends along the direction parallel to the D-axis.

[0042] In one embodiment, the two ends of the first arc segment 5 are respectively provided with a second arc segment 6, which is connected with the first arc segment 5, and a part of the second arc segment 6 is connected with the straight line segment 7 at the end away from the first arc segment 5, and the length of the straight line segment 7 decreases along the direction of the Q-axis.

[0043] Figs. 1-3 In one embodiment, the two ends of the first arc segment 5 are respectively provided with a second arc segment 6, which is connected with the first arc segment 5, and a part of the second arc segment 6 is connected with the straight line segment 7 at the end away from the first arc segment 5, and the length of the straight line segment 7 decreases along the direction of the Q-axis.

[0044] In one embodiment, the diameters of the inner magnetic bridges 4 increase along the direction of the Q-axis. In this embodiment, the inner magnetic bridges 4 are in the shape of arcs, the centers of the arcs of all the inner magnetic bridges 4 are the same as the center of the rotor punching sheet 1, and the diameters of the arcs of the inner magnetic bridges 4 of each layer of the rotor punching sheet 1 are D1,..., DNB-1 along the direction of the Q-axis, the diameters of the arcs of the inner magnetic bridges 4 of each layer can be different, and D1 to DNB-1 show an increasing trend as the number of layers increases.

[0045] In one embodiment, the diameters of the inner magnetic bridges 4 are the same.

[0046] In one embodiment, the rotor punching sheet 1 is further provided with a Q-axis magnetic barrier slot 8, which is located on the outer side of the D-axis magnetic barrier slot in the direction of the Q-axis.

[0047] According to the embodiments of the present application, the self-starting synchronous reluctance motor comprises the motor rotor as described above.

[0048] It is easy for those skilled in the art to understand that the above-mentioned advantageous modes can be freely combined and superimposed without conflict.

[0049] The above is only the preferred embodiment of the present application, and is not used to limit the present application, any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application. The above is only the preferred embodiment of the present application, and it should be pointed out that, for those skilled in the art, without departing from the technical principle of the present application, a number of improvements and modifications can be made, which shall be regarded as the protection scope of the present application.

Claims

1. A motor rotor, characterized in that: The invention comprises a rotor punching (1), wherein the rotor punching (1) is provided with a D-axis magnetic barrier slot, wherein the D-axis magnetic barrier slot comprises a filling slot (2) located at both ends and a non-filling slot (3) located in the middle, wherein the filling slot (2) and the non-filling slot (3) are separated by an internal magnetic bridge (4), wherein the internal magnetic bridge (4) is an arc structure with the center of the rotor punching (1) as the center of the circle, and the rotor punching (1) is concentrically arranged and stacked at a preset angle in the circumferential direction to form a skewed pole rotor; The non-filled slot (3) comprises a first arc segment (5), wherein the first arc segment (5) is a concentric arc with the center of the rotor punching (1) as the center; The central angle of the first arc segment (5) is A T The skew angle of the motor rotor is A max , A T >A max ; where N s is the number of stator slots; The first arc segment (5) is symmetrical about the Q axis.

2. The motor rotor according to claim 1, characterized in that: A second arc segment (6) is provided at each end of the first arc segment (5), and the second arc segment (6) is connected to the first arc segment (5); or a straight line segment (7) is provided at each end of the first arc segment (5), and the straight line segment (7) extends in a direction parallel to the D axis.

3. The motor rotor according to claim 1, characterized in that: A second arc segment (6) is provided at each end of the first arc segment (5), the second arc segment (6) is connected to the first arc segment (5), and a portion of the second arc segment (6) is connected to an end away from the first arc segment (5) with a straight line segment (7), and the length of the straight line segment (7) decreases along the Q-axis direction.

4. The motor rotor according to any one of claims 1 to 3, characterized in that The diameter of each inner magnetic bridge (4) increases gradually along the Q-axis direction.

5. The motor rotor according to any one of claims 1 to 3, characterized in that: The diameters of the inner magnetic bridges (4) are the same.

6. The motor rotor according to any one of claims 1 to 3, characterized in that: The rotor punching sheet (1) is further provided with a Q-axis magnetic barrier slot (8), and the Q-axis magnetic barrier slot (8) is located outside the D-axis magnetic barrier slot in the Q-axis direction.

7. The motor rotor according to any one of claims 1 to 3, characterized in that: The filling groove (2) is filled with conductive but non-magnetic material.

8. A self-starting synchronous reluctance motor, comprising a motor rotor, characterized in that: The motor rotor is the motor rotor according to any one of claims 1 to 7.

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