A rotor of a tangential permanent magnet synchronous motor and a tangential permanent magnet synchronous motor

Abstract

The application provides a rotor of a tangential permanent magnet synchronous motor and the tangential permanent magnet synchronous motor. The rotor of the tangential permanent magnet synchronous motor comprises a rotor core and a permanent magnet. The rotor core comprises a plurality of permanent magnet grooves which are arranged at intervals in the circumferential direction. The permanent magnet is arranged in the permanent magnet groove. In the projection plane of the axial end surface of the rotor core, the side edge of the permanent magnet groove opposite to one end of the first side edge is a fifth side edge. A first magnetic isolation groove is arranged on the rotor core and connected with the fifth side edge. One end of the first magnetic isolation groove is connected with the fifth side edge, and the other end of the first magnetic isolation groove extends towards the radial outer edge of the rotor core and is spaced apart from the radial outer edge by a preset distance. The projection plane of the first magnetic isolation groove on the axial end surface of the rotor core comprises at least two arc-shaped grooves which are connected in sequence. According to the application, the magnetic path of the permanent magnet is prolonged, and the magnetic leakage of the end of the permanent magnet is reduced.

Description

Technical Field

[0001] This invention relates to the field of motor technology, specifically to a rotor and a tangential permanent magnet synchronous motor. Background Technology

[0002] In a tangential permanent magnet synchronous motor, the magnetization direction of the permanent magnet is tangential, and the magnetization directions of two adjacent permanent magnets are opposite. This structure has a "magnetic concentration" effect. However, there is a large leakage flux at the end of the permanent magnet. Therefore, leakage flux is generally reduced by slotting the permanent magnet near the outer circle of the rotor and setting a magnetic isolation bridge near the shaft of the permanent magnet. For example, the leakage flux can be reduced by reducing the width of the magnetic bridge, but at the same time, there is also the possibility of a decrease in rotor strength.

[0003] Because the permanent magnets in existing tangential permanent magnet synchronous motors have large leakage flux at their ends, and overcoming leakage flux would reduce rotor strength and other technical problems, this invention studies and designs a rotor and a tangential permanent magnet synchronous motor. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the permanent magnet of the tangential permanent magnet synchronous motor has a large leakage flux at its end, thereby providing a rotor of the tangential permanent magnet synchronous motor and the tangential permanent magnet synchronous motor.

[0005] To address the above problems, the present invention provides a rotor for a tangential permanent magnet synchronous motor, comprising:

[0006] The rotor core includes a rotor core and permanent magnets. The rotor core includes a plurality of permanent magnet slots spaced circumferentially. The permanent magnets are disposed in the permanent magnet slots. In the projection plane of the axial end face of the rotor core, the permanent magnets include a first side located radially outward, a second side located radially inward, a third side located on one circumferential side, and a fourth side located on the other circumferential side. The first side and the second side are arranged opposite to each other. The side of the permanent magnet slot opposite to one end of the first side is a fifth side. A first magnetic isolation slot is disposed on the rotor core and grounded to the fifth side. One end of the first magnetic isolation slot is connected to the fifth side, and the other end extends toward the radial outer edge of the rotor core and is spaced at a predetermined distance from the radial outer edge. The projection plane of the first magnetic isolation slot on the axial end face of the rotor core includes at least two sequentially connected arc-shaped slots.

[0007] In some embodiments, the side of the permanent magnet slot opposite to the third side is a sixth side, which is connected to the fifth side. A second magnetic isolation slot is provided on the rotor core and connected to the sixth side. One end of the second magnetic isolation slot is connected to the sixth side, and the other end extends toward the radial outer edge of the rotor core and is spaced at a predetermined distance from the radial outer edge. The projection surface of the second magnetic isolation slot on the axial end face of the rotor core includes at least two sequentially connected arc-shaped slots. The second magnetic isolation slot has the same structure as the first magnetic isolation slot. In the projection surface of the axial end face of the rotor core, an angle bisector L3 is drawn at the intersection of the fifth side and the sixth side. The first magnetic isolation slot and the second magnetic isolation slot are symmetrical with respect to the angle bisector L3.

[0008] In some embodiments, a third magnetic isolation groove is provided on the rotor core and grounded to the fifth side. The third magnetic isolation groove is located away from the angle bisector L3 relative to the first magnetic isolation groove. One end of the third magnetic isolation groove is connected to the fifth side, and the other end extends toward the radial outer edge of the rotor core and is spaced at a predetermined distance from the radial outer edge. The projection of the third magnetic isolation groove on the axial end face of the rotor core is an arc-shaped groove.

[0009] In some embodiments, a fourth magnetic isolation groove is provided on the rotor core and grounded to the sixth side; one end of the fourth magnetic isolation groove is connected to the sixth side, and the other end extends toward the radial outer edge of the rotor core and is spaced at a predetermined distance from the radial outer edge. The projection of the fourth magnetic isolation groove on the axial end face of the rotor core is an arc-shaped groove. The fourth magnetic isolation groove has the same structure as the third magnetic isolation groove. In the projection plane of the axial end face of the rotor core, the third magnetic isolation groove and the fourth magnetic isolation groove are symmetrical with respect to the angle bisector L3.

[0010] In some embodiments, within the projection plane of the axial end face of the rotor core, the line connecting the midpoint of the first side and the midpoint of the second side is taken as the central axis of the permanent magnet. The first magnetic isolation groove, the second magnetic isolation groove, the third magnetic isolation groove, and the fourth magnetic isolation groove constitute a magnetic isolation unit. The magnetic isolation unit is provided on both sides of the rotor core circumferentially along the central axis L2. Furthermore, the magnetic isolation unit on one side of the circumferential axis L2 and the magnetic isolation unit on the other side of the circumferential axis L2 are symmetrically distributed with the central axis as the axis of symmetry.

[0011] In some embodiments, the first magnetic shielding groove includes a first arc-shaped groove, a second arc-shaped groove, and a third arc-shaped groove, which are connected sequentially. The first arc-shaped groove and the third arc-shaped groove both protrude and recess in the same direction. The protruding direction of the second arc-shaped groove is opposite to that of the first arc-shaped groove, and the recessing direction of the second arc-shaped groove is opposite to that of the first arc-shaped groove.

[0012] The first, second, and third arc-shaped grooves all have the same outer diameter, r2, and the first, second, and third arc-shaped grooves all have the same inner diameter, r1; the third and fourth magnetic isolation grooves have an inner diameter of r3 and an outer diameter of r4.

[0013] In some embodiments, the central angles of the first, second, and third arc-shaped grooves are all 90°, and the central angles of the third and fourth magnetic shielding grooves are all 90°; and / or, at least one of the first, second, third, and fourth magnetic shielding grooves is filled with magnetic shielding material.

[0014] In some embodiments, within the projection plane of the axial end face of the rotor core, the connection length of the fifth side is b, and the distance between the intersection point of the first magnetic isolation groove and the fifth side and the intersection point of the third magnetic isolation groove and the fifth side is a; and r1 > b / 3, a > b / 5.

[0015] In some embodiments, a limiting groove is further formed on the rotor core and on the radially inner side of the second side to limit the radially inner end of the permanent magnet. A first magnetic isolation bridge is provided on one circumferential side of the limiting groove in a circumferential outward direction, and a second magnetic isolation bridge is provided on the other circumferential side of the limiting groove in a circumferential outward direction. Magnetic isolation material is introduced into the first magnetic isolation bridge and the second magnetic isolation bridge.

[0016] In some embodiments, two adjacent limiting grooves include a first limiting groove and a second limiting groove. A first magnetic isolation bridge is protruding on the circumferential side of the first limiting groove opposite to the second limiting groove, and a second magnetic isolation bridge is protruding on the circumferential side of the second limiting groove opposite to the first limiting groove. The first magnetic isolation bridge and the second magnetic isolation bridge are staggered, that is, the first magnetic isolation bridge and the second magnetic isolation bridge are not opposite in the circumferential direction, and the first magnetic isolation bridge and the second magnetic isolation bridge have at least partial overlap in the radial direction.

[0017] In some embodiments, within the projection plane of the axial end face of the rotor core, the first magnetic isolation bridge is a fan-shaped annular structure formed by two arc-shaped structures, with an outer radial radius of r7 and an inner radial radius of r8; the second magnetic isolation bridge is a fan-shaped annular structure formed by two arc-shaped structures, with an outer radial radius of r5 and an inner radial radius of r6; the central angle of the first magnetic isolation bridge is angle1, and the central angle of the second magnetic isolation bridge is angle2; the first magnetic isolation bridge is located radially outside the second magnetic isolation bridge, and the first magnetic isolation bridge and the second magnetic isolation bridge are radially spaced apart, with a radial spacing width of r8-r5.

[0018] In some embodiments, the circumferential length of the overlapping portion of the first magnetic isolation bridge and the second magnetic isolation bridge in the radial direction is... Where D1 is the radial outer diameter of the rotor core, W is the radial length of the permanent magnet, the permanent magnet slot includes an inverted "T" shaped slot located at the radial outer end of the permanent magnet, U is the radial depth of the inverted "T" shaped slot, and V is the radial depth of the limiting slot.

[0019] In some embodiments, the first magnetic isolation bridge and the second magnetic isolation bridge satisfy the following relationship:

[0020] ;

[0021] ;

[0022] Wherein, D1 is the radial outer diameter of the rotor core, W is the radial length of the permanent magnet, the permanent magnet slot includes an inverted "T" shaped slot located at the radial outer end of the permanent magnet, U is the radial depth of the inverted "T" shaped slot, V is the radial depth of the limiting slot, N is the minimum circumferential distance between the fifth side and the sixth side, the fifth magnetic isolation slot is symmetrically distributed with respect to the central axis L2 with respect to the third magnetic isolation slot, the seventh side is symmetrically distributed with respect to the central axis L2 with respect to the fifth side, Z is the distance between the connection point of the third magnetic isolation slot and the fifth side and the connection point of the fifth magnetic isolation slot and the seventh side, and P is the number of pole pairs of the rotor.

[0023] The present invention also provides a tangential permanent magnet synchronous motor, which includes the rotor of the tangential permanent magnet synchronous motor described in any of the preceding claims.

[0024] The rotor and the tangential permanent magnet synchronous motor provided by this invention have the following beneficial effects:

[0025] 1. This invention effectively enhances the magnetic isolation effect at the radial outer edge of the permanent magnet slot by grounding a first magnetic isolation slot, which is configured to include at least two arc-shaped slots. This prevents magnetic leakage caused by magnetic lines of force passing through the narrow space. In other words, this invention effectively extends the magnetic path of the permanent magnet by adding a "W"-shaped magnetic isolation slot near the permanent magnet on the outermost circle of the rotor pole, reducing magnetic leakage at the end of the permanent magnet. Furthermore, this invention also includes a second magnetic isolation slot symmetrically arranged with respect to the angle bisector of the first magnetic isolation slot. The second magnetic isolation slot is also... The "W"-shaped slot structure, including at least two arc-shaped slots, can further enhance the magnetic isolation effect at the radial outer edge end and increase the magnetic circuit path of the permanent magnet. The invention also further reduces magnetic leakage at the radial outer edge end by setting a third magnetic isolation slot at a position away from the angle bisector of the first magnetic isolation slot. The interaction between the third magnetic isolation slot and the first magnetic isolation slot can further reduce magnetic leakage at the radial outer edge end. Furthermore, the fourth magnetic isolation slot, which is symmetrically arranged with the third magnetic isolation slot relative to the angle bisector, can work together with the second magnetic isolation slot to reduce magnetic leakage in the narrow section from the permanent magnet to the radial outer edge, increase the magnetic field strength, and increase the output power of the rotor.

[0026] 2. This invention further enhances the magnetic path of the limiting groove in the radial inner side of the permanent magnet groove by forming a first magnetic isolation bridge protruding from one side to the other in the circumferential direction, and a second magnetic isolation bridge protruding from the other side in the circumferential direction. This effectively increases the magnetic path in the tangential direction of the limiting groove, thereby increasing the length of the magnetic isolation bridge, reducing the constraint of the rotor yoke space, and enhancing the magnetic isolation effect. Simultaneously, the increased overall width of the magnetic isolation bridge is beneficial for increasing the strength of the rotor. Furthermore, this invention preferably sets the first and second magnetic isolation bridges, which are arranged opposite to each other, in an alternating configuration, meaning that the first and second magnetic isolation bridges partially overlap in the radial direction. This further increases the magnetic path in the tangential direction, increases the length of the magnetic isolation bridge, further reduces the constraint of the rotor yoke space, further improves the magnetic isolation effect, and further increases the overall width of the magnetic isolation bridge, thereby increasing the strength of the rotor. Attached Figure Description

[0027] Figure 1 This is a top view of the rotor structure of the tangential permanent magnet synchronous motor of the present invention (including the rotor core and permanent magnets).

[0028] Figure 2 This is a top view of the rotor lamination of the tangential permanent magnet synchronous motor of the present invention (only including the rotor core).

[0029] Figure 2a yes Figure 2 A magnified view of part C in the image;

[0030] Figure 3 This is a top view of the tangential permanent magnet synchronous motor rotor after plastic encapsulation (including rotor core and permanent magnet).

[0031] Figure 4 This is a top view of the rotor structure in the prior art;

[0032] Figure 5 yes Figure 1 A magnified view of part A in the middle;

[0033] Figure 5a yes Figure 5 Dimensional relationship diagram of the "W"-shaped magnetic shielding groove;

[0034] Figure 5b yes Figure 5 Dimensional relationship diagram of the third and fourth magnetic isolation slots;

[0035] Figure 6 yes Figure 1 A magnified view of part B in the middle section;

[0036] Figure 7 This is a diagram of the outer magnetic field distribution of the rotor in the prior art;

[0037] Figure 8 This is a diagram showing the magnetic field distribution on the outside of the rotor after the addition of magnetic isolation slots according to the present invention;

[0038] Figure 9 yes Figure 7 and Figure 8 A comparison of the leakage magnetic flux coefficients of the two structures.

[0039] The reference numerals in the attached figures are as follows:

[0040] 1. Rotor core (rotor pole); 2. Permanent magnet; 21. First side; 22. Second side; 23. Third side; 24. Fourth side; 6. Permanent magnet slot; 61. Fifth side; 62. Sixth side; 63. Limiting slot; 13. Second magnetic isolation slot; 14. First magnetic isolation slot; 131. First arc-shaped slot; 132. Second arc-shaped slot; 133. Third arc-shaped slot; 15. Third magnetic isolation... 12. Fourth magnetic isolation slot; 100. Magnetic isolation unit; 3. Rotor yoke; 4. Mounting hole; 5. Shaft hole; 7. Injection molded body of the outer chamber of the permanent magnet slot; 8. Injection molded body of the mounting hole; 9. Injection molded body of the "W"-shaped magnetic isolation slot; 10. Injection molded body of the inner chamber of the first permanent magnet slot; 11. Injection molded body of the inner chamber of the second permanent magnet slot; 16. First magnetic isolation bridge; 17. Second magnetic isolation bridge; 18. Inverted "T"-shaped slot. Detailed Implementation

[0041] like Figure 1-9 As shown, the present invention provides a rotor for a tangential permanent magnet synchronous motor, comprising:

[0042] The rotor core 1 comprises a rotor core 1 and permanent magnets 2. The rotor core 1 includes a plurality of permanent magnet slots 6 spaced circumferentially. The permanent magnets 2 are disposed in the permanent magnet slots 6 and lie within the projection plane of the axial end face of the rotor core 1. Preferably, the permanent magnets 2 have a rectangular structure. The permanent magnets 2 include a first side 21 located radially outward, a second side 22 located radially inward, a third side 23 located on one circumferential side, and a fourth side 24 located on the other circumferential side. The first side 21 and the second side 22 are arranged opposite to each other. The side of the groove 6 opposite to one end of the first side 21 is the fifth side 61. A first magnetic isolation groove 14 is provided on the rotor core 1 and grounded to the fifth side 61. One end of the first magnetic isolation groove 14 is connected to the fifth side 61, and the other end extends toward the radial outer edge of the rotor core 1 and is spaced at a predetermined distance from the radial outer edge. The projection surface of the first magnetic isolation groove 14 on the axial end face of the rotor core 1 includes at least two arc-shaped grooves connected in sequence. Preferably, the first magnetic isolation groove 14 is a "W" shaped groove. This invention provides a first magnetic isolation groove grounded on the radially outer side of the permanent magnet groove. The first magnetic isolation groove is configured as a "W"-shaped groove, including at least two arc-shaped grooves. This effectively enhances the magnetic isolation effect between the permanent magnet groove and the radially outer edge of the rotor core, preventing magnetic leakage caused by magnetic lines of force in the narrow space. In other words, this invention effectively extends the magnetic path of the permanent magnet by adding an arc-shaped groove (preferably a "W"-shaped magnetic isolation groove) near the permanent magnet on the outer circle of the rotor pole, reducing magnetic leakage at the end.

[0043] By comparison Figure 7 and Figure 8 The existing rotor's outer magnetic field contains a significant amount of leakage magnetic flux. Figure 7 The magnetic circuit represented by the dashed line (the part of the magnetic circuit with leakage flux does not pass through the stator side; the main magnetic circuit is the air gap); while the present invention Figure 8 The leakage magnetic field in the outer magnetic field of the rotor after the addition of the magnetic isolation groove disappears (the magnetic circuit of the dotted line disappears), which improves the utilization rate of the permanent magnet. Figure 9 The results show the calculated leakage flux coefficient. The leakage flux coefficient of the rotor under the new structure with the addition of the magnetic isolation slot is reduced, which further verifies the effectiveness of the structure in reducing leakage flux.

[0044] This invention provides a permanent magnet rotor with a tangential magnetization direction. By adding a "W"-shaped magnetic isolation groove near the permanent magnet slot on the outer circle of the rotor pole, the magnetic circuit path at that location is extended, reducing magnetic leakage. Simultaneously, a "convex"-shaped structure is provided on the inner sidewall of the permanent magnet chamber, which increases the tangential magnetic circuit path, increases the length of the magnetic isolation bridge, increases the magnetic reluctance of the magnetic circuit, weakens the constraint of the rotor yoke space, and increases the overall width of the magnetic isolation bridge, which is beneficial to increasing the strength of the rotor.

[0045] The following technical problems were solved:

[0046] 1. Reduce magnetic leakage at the end of the permanent magnet near the outer circumference of the rotor;

[0047] 2. Increase the length of the magnetic isolation bridge to strengthen the rotor.

[0048] exist Figure 1 In the middle, an inverted "T"-shaped slot 18 is formed on the outer circle of the rotor between adjacent rotor poles. The function of the inverted "T"-shaped slot is to form the injection molded body of the outer chamber of the permanent magnet slot 6. The injection molded body can prevent the injection molded body from detaching from the rotor in the radial direction due to the centrifugal force when the rotor rotates, thereby improving the overall strength of the rotor. The mounting hole 4 is a circular through hole located on the rotor pole. The function of the mounting hole is to enhance the stacking of the rotor and the convenience of injection molding. The shaft hole 5 is used to place the rotating shaft. In actual operation, the rotating shaft rotates together with the rotor.

[0049] In this example, the rotor has 8 poles (i.e., 2 permanent magnets). The magnetization direction of the permanent magnets is tangential, and the magnetization directions of adjacent permanent magnets are opposite. The magnetic field inside the rotor originates from the N pole of the permanent magnet, forming a closed loop through the air gap, stator, and S pole of the permanent magnet. Another type passes through the B magnetic isolation bridge. Loops that do not pass through the stator are called leakage magnetic circuits. When there is a significant amount of leakage magnetic field, the utilization rate of the permanent magnets will decrease. For tangential permanent magnet rotors, leakage magnetic field is generally reduced by setting open slots on the outer circumference of the rotor. Simultaneously, leakage magnetic field near the shaft side of the permanent magnet is reduced by decreasing the width of the B magnetic isolation bridge and increasing its length. This invention further reduces magnetic leakage near the outer circle of the permanent magnet by adding a "W"-shaped magnetic isolation groove near the outer circle of the rotor pole (rotor core 1) and the permanent magnet 2. Simultaneously, two "convex" structures, a first magnetic isolation bridge 16 (preferably a magnetic isolation strip structure) and a second magnetic isolation bridge 17 (preferably a magnetic isolation strip structure), are added to the inner chamber of the permanent magnet groove 6. This increases the path of the magnetic circuit in the tangential direction. The width and length of the magnetic isolation bridge affect the magnetic isolation capability. In conventional rotors, the length of the magnetic isolation bridge is often limited due to the limited rotor yoke space. However, by adopting this "convex" structure, the length of the magnetic isolation bridge can be changed by controlling angle1 and angle2 to adjust the length of the "convex" structure in the tangential direction, which is beneficial to strengthening the magnetic isolation capability. At the same time, the overall width of the B magnetic isolation bridge is increased, which is beneficial to strengthening the rotor's strength.

[0050] In some embodiments, the side of the permanent magnet slot 6 opposite to the third side 23 is a sixth side 62, which is connected to the fifth side 61. A second magnetic isolation slot 13 is provided on the rotor core 1 and connected to the sixth side 62. One end of the second magnetic isolation slot 13 is connected to the sixth side 62, and the other end extends toward the radial outer edge of the rotor core 1 and is spaced at a predetermined distance from the radial outer edge. The projection surface of the second magnetic isolation slot 13 on the axial end face of the rotor core 1 includes at least two sequentially connected arc-shaped slots. Preferably, the second magnetic isolation slot 13 is a "W"-shaped slot. The second magnetic isolation slot 13 has the same structure as the first magnetic isolation slot 14. In the projection surface of the axial end face of the rotor core 1, an angle bisector L3 is drawn at the intersection of the fifth side 61 and the sixth side 62. The first magnetic isolation slot 14 and the second magnetic isolation slot 13 are symmetrical with respect to the angle bisector L3. The present invention also uses a second magnetic isolation groove that is symmetrically arranged with respect to the angle bisector of the first magnetic isolation groove. The second magnetic isolation groove is also a "W"-shaped groove structure including at least two arc-shaped grooves, which can further enhance the magnetic isolation effect at the radial outer edge end and increase the magnetic circuit path of the permanent magnet.

[0051] In some embodiments, a third magnetic isolation groove 15 is provided on the rotor core 1 and grounded to the fifth side 61. The third magnetic isolation groove 15 is positioned away from the angle bisector L3 relative to the first magnetic isolation groove 14. One end of the third magnetic isolation groove 15 is connected to the fifth side 61, and the other end extends towards the radial outer edge of the rotor core 1 and is spaced at a predetermined distance from the radial outer edge. The projection of the third magnetic isolation groove 15 on the axial end face of the rotor core 1 is an arc-shaped groove. Furthermore, by providing a third magnetic isolation groove at a position away from the angle bisector of the first magnetic isolation groove, the present invention can further reduce magnetic leakage at the radial outer edge end through the interaction between the third magnetic isolation groove and the first magnetic isolation groove.

[0052] In some embodiments, a fourth magnetic isolation groove 12 is provided on the rotor core 1 and grounded to the sixth side 62. One end of the fourth magnetic isolation groove 12 is connected to the sixth side 62, and the other end extends towards the radial outer edge of the rotor core 1 at a predetermined distance from the radial outer edge. The projection of the fourth magnetic isolation groove 12 on the axial end face of the rotor core 1 is an arc-shaped groove. The fourth magnetic isolation groove 12 has the same structure as the third magnetic isolation groove 15. In the projection plane of the axial end face of the rotor core 1, the third magnetic isolation groove 15 and the fourth magnetic isolation groove 12 are symmetrical with respect to the angle bisector L3. Furthermore, the fourth magnetic isolation groove, which is symmetrically arranged with respect to the angle bisector with respect to the third magnetic isolation groove, can work together with the second magnetic isolation groove to reduce the leakage magnetic field of the permanent magnet to the narrow section of the radial outer edge, increase the magnetic field strength, and increase the output power of the rotor.

[0053] In some embodiments, within the projection plane of the axial end face of the rotor core 1, the line connecting the midpoint of the first side 21 and the midpoint of the second side 22 is taken as the central axis L2 of the permanent magnet 2. The first magnetic isolation groove 14, the second magnetic isolation groove 13, the third magnetic isolation groove 15, and the fourth magnetic isolation groove 12 form a magnetic isolation unit 100. The magnetic isolation unit 100 is provided on both sides of the rotor core 1 along the circumferential axis L2; ​​and the magnetic isolation unit 100 on one side of the circumferential axis L2 and the magnetic isolation unit 100 on the other side of the circumferential axis L2 are symmetrically distributed with the central axis L2 as the axis of symmetry. By providing magnetic isolation units composed of the first, second, third, and fourth magnetic isolation grooves at corresponding positions on both sides of the central axis L2, this invention can effectively isolate the permanent magnet at both ends along its circumferential direction, improving the prevention of magnetic leakage, further increasing the magnetic field strength, and increasing the output power of the rotor.

[0054] In some embodiments, the first magnetic isolation groove 14 includes a first arc-shaped groove 131, a second arc-shaped groove 132, and a third arc-shaped groove 133. The first arc-shaped groove 131, the second arc-shaped groove 132, and the third arc-shaped groove 133 are connected sequentially, and the first arc-shaped groove 131 and the third arc-shaped groove 133 both protrude and recess in the same direction. The protruding direction of the second arc-shaped groove 132 is opposite to the protruding direction of the first arc-shaped groove 131, and the recessing direction of the second arc-shaped groove 132 is opposite to the recessing direction of the first arc-shaped groove 131.

[0055] The first arc-shaped groove 131, the second arc-shaped groove 132, and the third arc-shaped groove 133 all have the same outer diameter, r2, and the first arc-shaped groove 131, the second arc-shaped groove 132, and the third arc-shaped groove 133 all have the same inner diameter, r1; the third magnetic isolation groove 15 and the fourth magnetic isolation groove 12 have an inner diameter of r3 and an outer diameter of r4.

[0056] This is a further preferred structural form of the first and second magnetic isolation grooves of the present invention, namely, a structure including three arc-shaped grooves, which are formed into an undulating wave-like structure, which can further improve the magnetic isolation effect on magnetic lines of force and further improve the effect of preventing magnetic leakage. In addition, the structure and size of the three arc-shaped grooves are the same, which can improve the uniformity of their effect of preventing magnetic leakage and further improve the effect of preventing magnetic leakage.

[0057] In some embodiments, the central angles of the first arc-shaped groove 131, the second arc-shaped groove 132, and the third arc-shaped groove 133 are all 90°, and the central angles of the third magnetic isolation groove 15 and the fourth magnetic isolation groove 12 are all 90°; and / or, at least one of the first magnetic isolation groove 14, the second magnetic isolation groove 13, the third magnetic isolation groove 15, and the fourth magnetic isolation groove 12 is filled with magnetic isolation material. This is a further preferred structural form of the first, second, and third arc-shaped grooves of the present invention, namely, arc segments with a central angle of 90°, and the third and fourth magnetic isolation grooves are also arc segments with a central angle of 90°; filling multiple magnetic isolation grooves with magnetic isolation material can further improve the magnetic isolation and leakage prevention effects, effectively reducing magnetic leakage at the end of the permanent magnet.

[0058] In some embodiments, within the projection plane of the axial end face of the rotor core 1, the length of the fifth side 61 is b (i.e., the limiting length for the permanent magnet in the permanent magnet slot), and the distance between the intersection point of the first magnetic isolation slot 14 and the fifth side 61 and the intersection point of the third magnetic isolation slot 15 and the fifth side 61 is a (i.e., the spacing between the first and third magnetic isolation slots); and r1 > b / 3, a > b / 5. By satisfying the above dimensional relationships, the present invention can further improve the magnetic isolation effect on the radial end of the permanent magnet and further reduce end magnetic leakage.

[0059] Figure 5 In the diagram, the structure of magnetic isolation groove A consists of a first, second, third, and fourth magnetic isolation groove. The first magnetic isolation groove 14 has an overall "W" shape, which is composed of three sections. These three sections are circular rings with a central angle of 90 degrees, and the inner and outer diameters of the rings are the same. L3 is the axis of symmetry. The fourth magnetic isolation groove 12 is located outside the second magnetic isolation groove 13 and is a circular ring with a central angle of 90 degrees. The width of the second magnetic isolation groove 13 is r2-r1, and the width of the fourth magnetic isolation groove 12 is r4-r3. The relevant dimensions of the magnetic isolation grooves must meet certain conditions to effectively reduce end magnetic leakage: r1 > b / 3, a > b / 5.

[0060] In some embodiments, a limiting groove 63 is formed on the rotor core 1, radially inner to the second side 22, to limit the radial inner end of the permanent magnet 2. A first magnetic isolation bridge 16 protrudes outward from one circumferential side of the limiting groove 63, and a second magnetic isolation bridge 17 protrudes outward from the other circumferential side of the limiting groove 63. Magnetic isolation material is introduced into the first magnetic isolation bridge 16 and the second magnetic isolation bridge 17. Furthermore, by forming a first magnetic isolation bridge protruding outward from one circumferential side of the limiting groove on the radial inner side of the permanent magnet groove, and a second magnetic isolation bridge protruding outward from the other circumferential side, the present invention can effectively increase the magnetic path of this limiting groove in the tangential direction, thereby increasing the length of the magnetic isolation bridge, thus weakening the constraint of the rotor yoke space, enhancing the magnetic isolation effect, and simultaneously increasing the overall width of the magnetic isolation bridge, which is beneficial to increasing the strength of the rotor.

[0061] In some embodiments, two adjacent limiting slots 63 include a first limiting slot and a second limiting slot. A first magnetic isolation bridge 16 protrudes from the circumferential side of the first limiting slot opposite to the second limiting slot, and a second magnetic isolation bridge 17 protrudes from the circumferential side of the second limiting slot opposite to the first limiting slot. The first magnetic isolation bridge 16 and the second magnetic isolation bridge 17 are staggered, meaning they are not opposite each other in the circumferential direction, but have at least partial overlap in the radial direction. The present invention further preferably sets the opposing first and second magnetic isolation bridges as staggered, meaning the first and second magnetic isolation bridges have partial structural overlap in the radial direction. This can further increase the magnetic circuit path in the tangential direction, increase the length of the magnetic isolation bridges, further reduce the constraint of the rotor yoke space on them, further improve the magnetic isolation effect, and further increase the overall width of the magnetic isolation bridges, thereby increasing the strength of the rotor.

[0062] In some embodiments, within the projection plane of the axial end face of the rotor core 1, the first magnetic isolation bridge 16 is a fan-shaped annular structure formed by two arc-shaped segments, with an outer radial radius of r7 and an inner radial radius of r8; the second magnetic isolation bridge 17 is also a fan-shaped annular structure formed by two arc-shaped segments, with an outer radial radius of r5 and an inner radial radius of r6. The central angle of the first magnetic isolation bridge 16 is angle1, and the central angle of the second magnetic isolation bridge 17 is angle2. The first magnetic isolation bridge 16 is located radially outside the second magnetic isolation bridge 17, and the first magnetic isolation bridge 16 and the second magnetic isolation bridge 17 are radially spaced apart, with a radial spacing width of r8-r5. This is a further preferred structural form and dimensional relationship of the first and second magnetic isolation bridges of the present invention, which can further reduce the constraint of the rotor yoke space on them, further improve the magnetic isolation effect, and further increase the overall width of the magnetic isolation bridges, thereby improving the strength of the rotor. Preferably, magnetic shielding material is introduced into the interior of the first and second magnetic shielding bridges, and more preferably, it is an injection molded body.

[0063] In some embodiments, the circumferential length of the overlapping portion of the first magnetic isolation bridge 16 and the second magnetic isolation bridge 17 in the radial direction is... Where D1 is the radial outer diameter of the rotor core, W is the radial length of the permanent magnet 2, the permanent magnet slot 6 includes an inverted "T" shaped slot located at the radial outer end of the permanent magnet 2, U is the radial depth of the inverted "T" shaped slot (i.e., the height of the outer chamber of the permanent magnet slot); V is the radial depth of the limiting slot 63 (i.e., the height of the inner chamber of the permanent magnet slot). D2 is the diameter of the shaft hole; M is the tangential width of the permanent magnet slot; S1 and S2 are the sidewalls of the inner chambers of adjacent permanent magnet slots; angle1 and angle2 represent central angles.

[0064] In some embodiments, the first magnetic isolation bridge 16 and the second magnetic isolation bridge 17 satisfy the following relationship:

[0065] ;

[0066] ;

[0067] Wherein, D1 is the radial outer diameter of the rotor core 1, W is the radial length of the permanent magnet 2, the permanent magnet slot 6 includes an inverted "T" shaped slot located at the radial outer end of the permanent magnet 2, U is the radial depth of the inverted "T" shaped slot, V is the radial depth of the limiting slot 63, when including the fifth side, the sixth side and the third magnetic isolation slot, N is the minimum circumferential distance between the fifth side 61 and the sixth side 62 (i.e., the upper bottom width of the inner chamber of the permanent magnet slot), let the fifth magnetic isolation slot be symmetrically distributed with respect to the third magnetic isolation slot 15 relative to the central axis L2, and the seventh side be symmetrically distributed with respect to the fifth side 61 relative to the central axis L2, Z is the distance between the connection point of the third magnetic isolation slot 15 and the fifth side 61 and the connection point of the fifth magnetic isolation slot and the seventh side (i.e., the lower bottom width of the inner chamber of the permanent magnet slot), and P is the number of pole pairs of the rotor.

[0068] By adopting this "convex" structure, the length of the magnetic isolation bridge can be changed by controlling angle1 and angle2 to adjust the length of the "convex" structure in the tangential direction, which is beneficial to strengthening the magnetic isolation capability; at the same time, the overall width of the B magnetic isolation bridge is increased, which is beneficial to strengthening the rotor strength.

[0069] exist Figure 7 In the previous B-type magnetic isolation bridge, the width of the magnetic isolation bridge can be expressed as:

[0070] .

[0071] The width of the magnetic isolation bridge is mainly related to the outer diameter of the rotor and the size of the permanent magnet. The length of the magnetic isolation bridge is generally about 1 / 30 of D1, thus the size of the magnetic isolation bridge is subject to certain constraints. In this example, two "convex" structures, the first magnetic isolation bridge 16 and the second magnetic isolation bridge 17, are added. This structure consists of two arc segments in the radial direction, and its width is the difference between the radii of the arcs. Their widths are r7-r8 and r5-r6, respectively. The width of the magnetic isolation bridge between the two "convex" structures is r8-r5, and its length is approximately:

[0072]

[0073] This length is related to the central angle angle2 of the "convex" structure (second magnetic isolation bridge 17). Therefore, the tangential length of the magnetic isolation bridge can be indirectly adjusted by changing the dimensions of the inner chamber of the permanent magnet slot 6. The overall width of the B magnetic isolation bridge (the average distance between S1 and S2) increases, increasing rotor strength. Simultaneously, the ideal magnetic isolation capability is achieved by limiting the dimensions of the "convex" structure. To ensure sufficient magnetic isolation capability, the magnetic isolation bridges between the "convex" structures should satisfy the following formula:

[0074]

[0075] .

[0076] The present invention also provides a tangential permanent magnet synchronous motor, which includes the rotor of the tangential permanent magnet synchronous motor described in any of the preceding claims. By comparison... Figure 7 and Figure 8 The existing rotor's outer magnetic field contains a significant amount of leakage magnetic flux. Figure 7 The magnetic circuit represented by the dashed line (the part of the magnetic circuit with leakage flux does not pass through the stator side; the main magnetic circuit is the air gap); while the present invention Figure 8 The leakage magnetic field in the outer magnetic field of the rotor after the addition of the magnetic isolation groove disappears (the magnetic circuit of the dotted line disappears), which improves the utilization rate of the permanent magnet. Figure 9 The results show the calculated leakage flux coefficient. The leakage flux coefficient of the rotor under the new structure with the addition of the magnetic isolation slot is reduced, which further verifies the effectiveness of the structure in reducing leakage flux.

[0077] 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 should be included within the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A rotor of a tangential permanent magnet synchronous motor, characterized by: Comprise: Rotor core (1) and permanent magnet (2), rotor core (1) includes a plurality of permanent magnet slots (6) arranged in the circumferential direction, the permanent magnet (2) is arranged in the permanent magnet slot (6), in the projection plane of the axial end surface of the rotor core (1), the permanent magnet (2) includes the first side (21) located at the radial outside, the second side (22) located at the radial inside, the third side (23) located at one side of the circumferential direction and the fourth side (24) located at the other side of the circumferential direction, the first side (21) and the second side (22) are oppositely arranged, the side of the permanent magnet slot (6) opposite to one end of the first side (21) is the fifth side (61), the first magnetic separation slot (14) is arranged on the rotor core (1) and is connected with the fifth side (61); one end of the first magnetic separation slot (14) is connected with the fifth side (61), the other end extends towards the radial outer edge of the rotor core (1) and is spaced apart from the radial outer edge by a predetermined distance, the projection plane of the first magnetic separation slot (14) on the axial end surface of the rotor core (1) comprises at least two arc-shaped slots connected in sequence; The side of the permanent magnet slot (6) opposite to the third side (23) is the sixth side (62), the sixth side (62) is connected with the fifth side (61), and the second magnetic separation slot (13) is arranged on the rotor core (1) and is connected with the sixth side (62); one end of the second magnetic separation slot (13) is connected with the sixth side (62), the other end extends towards the radial outer edge of the rotor core (1) and is spaced apart from the radial outer edge by a predetermined distance, the projection plane of the second magnetic separation slot (13) on the axial end surface of the rotor core (1) comprises at least two arc-shaped slots connected in sequence, and the structure of the second magnetic separation slot (13) is the same as that of the first magnetic separation slot (14); in the projection plane of the axial end surface of the rotor core (1), the angle bisector L3 is drawn from the intersection point of the fifth side (61) and the sixth side (62), and the first magnetic separation slot (14) and the second magnetic separation slot (13) are symmetrically arranged relative to the angle bisector L3.

2. The rotor of the tangential permanent magnet synchronous motor according to claim 1, wherein: The third magnetic separation slot (15) is arranged on the rotor core (1) and is connected with the fifth side (61), and the third magnetic separation slot (15) is arranged away from the angle bisector L3 relative to the first magnetic separation slot (14); one end of the third magnetic separation slot (15) is connected with the fifth side (61), the other end extends towards the radial outer edge of the rotor core (1) and is spaced apart from the radial outer edge by a predetermined distance, and the projection of the third magnetic separation slot (15) on the axial end surface of the rotor core (1) is an arc-shaped slot.

3. The rotor of the tangential permanent magnet synchronous motor according to claim 2, wherein: The rotor core (1) is provided with a fourth magnetic separation groove (12) on the sixth side (62); one end of the fourth magnetic separation groove (12) is connected with the sixth side (62), the other end extends towards the radial outer edge of the rotor core (1) and is spaced apart from the radial outer edge by a predetermined distance, the projection of the fourth magnetic separation groove (12) on the axial end surface of the rotor core (1) is an arc-shaped groove, and the fourth magnetic separation groove (12) has the same structure as the third magnetic separation groove (15); in the projection plane of the axial end surface of the rotor core (1), the third magnetic separation groove (15) and the fourth magnetic separation groove (12) have a symmetrical structure relative to the angle bisector L3.

4. The rotor of the tangential permanent magnet synchronous motor according to claim 3, characterized in that: In the projection plane of the axial end surface of the rotor core (1), the first magnetic separation groove (14), the second magnetic separation groove (13), the third magnetic separation groove (15) and the fourth magnetic separation groove (12) form a magnetic separation unit (100), the center axis L2 of the permanent magnet (2) is the line connecting the midpoint of the first side (21) and the midpoint of the second side (22), and the magnetic separation unit (100) is arranged on the rotor core (1) on both sides of the center axis L2 in the circumferential direction; and the magnetic separation units (100) on both sides of the center axis L2 in the circumferential direction are symmetrically distributed about the center axis L2.

5. The rotor of the tangential permanent magnet synchronous motor according to claim 3, characterized in that: The first magnetic separation groove (14) comprises a first arc-shaped groove (131), a second arc-shaped groove (132) and a third arc-shaped groove (133), the first arc-shaped groove (131), the second arc-shaped groove (132) and the third arc-shaped groove (133) are connected in sequence, and the first arc-shaped groove (131) and the third arc-shaped groove (133) protrude and recess in the same direction, the protruding direction of the second arc-shaped groove (132) is opposite to that of the first arc-shaped groove (131), and the recessing direction of the second arc-shaped groove (132) is opposite to that of the first arc-shaped groove (131); The outer diameters of the first arc-shaped groove (131), the second arc-shaped groove (132) and the third arc-shaped groove (133) are the same, all being r2, and the inner diameters of the first arc-shaped groove (131), the second arc-shaped groove (132) and the third arc-shaped groove (133) are the same, all being r1; the inner diameter of the third magnetic separation groove (15) and the fourth magnetic separation groove (12) is r3, and the outer diameter is r4.

6. The rotor of the tangential permanent magnet synchronous motor according to claim 5, characterized in that: The central angles of the first arc-shaped slot (131), the second arc-shaped slot (132) and the third arc-shaped slot (133) are all 90°, and the central angles of the third magnetic isolation slot (15) and the fourth magnetic isolation slot (12) are all 90°; and / or, at least one of the first magnetic isolation slot (14), the second magnetic isolation slot (13), the third magnetic isolation slot (15) and the fourth magnetic isolation slot (12) is filled with a magnetic isolation material.

7. The rotor of the tangential permanent magnet synchronous motor according to claim 5, characterized in that: In the projection plane of the axial end surface of the rotor core (1), the length of the fifth side (61) is b, and the distance between the intersection point of the first magnetic isolation slot (14) and the fifth side (61) and the intersection point of the third magnetic isolation slot (15) and the fifth side (61) is a; and r1 > b / 3, a > b / 5.

8. The rotor of the tangential permanent magnet synchronous motor according to any one of claims 1-7, characterized in that: A limiting slot (63) is further provided on the rotor core (1) radially inward of the second side (22) to limit the radially inner end of the permanent magnet (2), a first magnetic isolation bridge (16) is protrudingly provided on one circumferential side of the limiting slot (63) in a circumferential outward protruding direction, and a second magnetic isolation bridge (17) is protrudingly provided on the other circumferential side of the limiting slot (63) in a circumferential outward protruding direction, and the first magnetic isolation bridge (16) and the second magnetic isolation bridge (17) are filled with a magnetic isolation material.

9. The rotor of the tangential permanent magnet synchronous motor according to claim 8, characterized in that: The two adjacent limiting slots (63) include a first limiting slot and a second limiting slot, the first magnetic isolation bridge (16) is protrudingly provided on the circumferential side of the first limiting slot opposite to the second limiting slot, the second magnetic isolation bridge (17) is protrudingly provided on the circumferential side of the second limiting slot opposite to the first limiting slot, the first magnetic isolation bridge (16) and the second magnetic isolation bridge (17) are staggered, i.e., the first magnetic isolation bridge (16) and the second magnetic isolation bridge (17) are not opposite in the circumferential direction, and at least partially overlap in the radial direction.

10. The rotor of the tangential permanent magnet synchronous motor according to claim 9, characterized in that: In the projection plane of the axial end surface of the rotor core (1), the first flux barrier (16) is a fan ring structure surrounded by two arc structures, the arc radius of the radially outer end is r7, and the arc radius of the radially inner end is r8; the second flux barrier (17) is a fan ring structure surrounded by two arc structures, the arc radius of the radially outer end is r5, and the arc radius of the radially inner end is r6, the central angle of the first flux barrier (16) is angle1, the central angle of the second flux barrier (17) is angle2, the first flux barrier (16) is located radially outside the second flux barrier (17), and the first flux barrier (16) and the second flux barrier (17) are arranged radially apart from each other, and the radial spacing width between them is r8-r5.

11. The rotor of a tangential permanent magnet synchronous motor according to claim 10, characterized in that: The circumferential length of the overlap of the first magnetic isolation bridge (16) and the second magnetic isolation bridge (17) in the radial direction is Wherein D1 is the radial outer edge diameter of the rotor core (1), W is the radial length of the permanent magnet (2), the permanent magnet slot (6) comprises an inverted "T" shaped notch at the radial outer end of the permanent magnet (2), U is the radial depth of the inverted "T" shaped notch, V is the radial depth of the limiting slot (63), N is the minimum circumferential distance between the fifth side (61) and the sixth side (62), and P is the pole pair number of the rotor.

12. The rotor of a tangential permanent magnet synchronous motor according to claim 10, characterized in that: The first flux barrier (16) and the second flux barrier (17) satisfy the following relationship: ； ； Where D1 is the diameter of the radially outer edge of the rotor core (1), W is the radial length of the permanent magnet (2), the permanent magnet slot (6) includes a reverse "T" shaped notch at the radially outer end of the permanent magnet (2), U is the radial depth of the reverse "T" shaped notch, V is the radial depth of the limiting slot (63), N is the minimum circumferential distance between the fifth side (61) and the sixth side (62) when the fifth side, the sixth side and the third flux barrier slot are included, in the projection plane of the axial end surface of the rotor core (1), taking the line connecting the midpoint of the first side (21) and the midpoint of the second side (22) as the center axis L2 of the permanent magnet (2), assuming that the fifth flux barrier slot is symmetrically distributed with the third flux barrier slot (15) relative to the center axis L2 as the axis of symmetry, the seventh side is symmetrically distributed with the fifth side (61) relative to the center axis L2 as the axis of symmetry, Z is the distance between the junction of the third flux barrier slot (15) and the fifth side (61) and the junction of the fifth flux barrier slot and the seventh side, and P is the number of pole pairs of the rotor.

13. A tangential permanent magnet synchronous motor, characterized by: A tangential permanent magnet synchronous motor comprising the rotor of any one of claims 1-12.

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