Permanent magnet transverse hybrid excitation type non-salient pole rotor for permanent magnet synchronous motor and motor

Abstract

The invention provides a permanent magnet cross hybrid excitation type non-salient pole rotor used for a permanent magnet synchronous motor, the rotor comprises a rotor core cage, main magnetic pole magnetic steel and auxiliary magnetic pole magnetic steel, the rotor core cage comprises a cylindrical outer side wall and an inner side wall, an even number of fan-shaped holes are arranged between the outer side wall and the inner side wall at equal intervals, and the outer side wall and the inner side wall are cylindrical. Each fan-shaped hole is symmetrical along the radial direction of the cylindrical outer side wall; a rectangular hole is formed between every two adjacent fan-shaped holes; a notch is formed in the center position, corresponding to the rectangular hole, of the cylindrical outer side wall; the side, close to the inner side wall, of the rectangular hole is not provided with a frame. A saturation magnetic bridge is formed among the fan-shaped holes, the rectangular holes and the inner side wall through rib bridges and boss structures. According to the invention, press-fitting combination of permanent magnets with different shapes and magnetizing directions is realized through the rotor iron core cage, so that the cross excitation non-salient pole rotor is formed; the rotor iron core cage can be fully provided with magnetic steel materials in a limited space, so that the air gap magnetic flux density is greatly increased; and the rotor assembly process is simplified.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and specifically to a permanent magnet transverse composite excitation type salient pole rotor and motor for a permanent magnet synchronous motor. Background Technology

[0002] The excitation of a permanent magnet synchronous motor is usually generated on the rotor. There are various rotor magnetic circuit structures, which can be divided into radial magnetic circuits and axial magnetic circuits according to the direction of the air gap magnetic flux. Radial magnetic circuit motors are currently the most widely used solution in the field of motor technology. Within the radial magnetic circuit structure, based on the relative relationship between the rotor and stator, it can be divided into inner rotors and outer rotors; according to the different arrangements of the permanent magnets on the rotor, it can be further divided into surface-mounted permanent magnet (SPM) and interior permanent magnet (IPM). The interior permanent magnet is also known as a salient pole type.

[0003] In 1979, American scholar Klaus Halbach invented and proposed the Halbach array, a permanent magnet steel array that tightly presses radially magnetized magnets and tangentially magnetized magnets together to form a single permanent magnet pole. In a Halbach array, due to the different shapes and magnetization directions of the various magnets, irregular repulsive forces occur between the individual magnets, i.e., transverse magnetic field repulsion. Achieving this press-fit assembly of magnet poles is difficult in engineering; auxiliary measures or structures are necessary to limit the movement of the different magnets to complete the assembly.

[0004] Chinese invention patent application CN202210780112.8 discloses a Halbach magnetic pole array structure, an inner rotor, and a permanent magnet synchronous motor. The Halbach magnetic pole array structure is composed of multiple magnetic pole configuration units with closed magnetic circuits spliced ​​in a ring. Each magnetic pole configuration unit includes two first magnetic poles with a cross-section of approximately isosceles triangles and radially magnetized, two second magnetic poles with a cross-section of approximately right trapezoids and obliquely magnetized, and a third magnetic pole with a cross-section of approximately rectangle and tangentially magnetized. The apex of the first magnetic pole points to the center of the circle. The waist side of the first magnetic pole is joined with the oblique side of the second magnetic pole, and the right-angled side of the third magnetic pole is joined with the right-angled side of the second magnetic pole. Thus, by arranging and combining magnetic poles of different shapes and magnetization directions, the advantage of very low leakage flux on one side of the Halbach array is further utilized, resulting in better magnetic shielding, reduced back iron mass, and reduced energy consumption during the operation of the permanent magnet synchronous motor. Without increasing the volume of the permanent magnet, it improves the electromagnetic output torque performance and reduces electromagnetic torque pulsation. However, the invention does not disclose what auxiliary measures or structures are used to achieve the press-fit assembly of the Halbach magnetic pole array structure. Summary of the Invention

[0005] To solve at least one of the above technical problems, the present invention provides a permanent magnet transverse composite excitation type salient pole rotor and motor for permanent magnet synchronous motors.

[0006] A first aspect of the present invention provides a permanent magnet transverse quadrature composite excitation type salient pole rotor for a permanent magnet synchronous motor, comprising: a rotor core cage, main pole magnets, and auxiliary pole magnets, wherein,

[0007] The rotor core cage includes a cylindrical outer sidewall and an inner sidewall. An even number of annularly arranged sector-shaped holes, extending axially and penetrating the cylindrical outer sidewall, are equally spaced between the outer and inner sidewalls. Each sector-shaped hole is radially symmetrical along the cylindrical outer sidewall. A rectangular hole extending axially and penetrating the cylindrical outer sidewall is provided between two adjacent sector-shaped holes. A notch, penetrating the rectangular hole and extending axially along the cylindrical outer sidewall, is provided on the cylindrical outer sidewall at its center position corresponding to the rectangular hole, used to cut off the leakage magnetic path of the auxiliary pole magnet. The side of the rectangular hole closest to the inner sidewall has no frame. The frame of the sector-shaped hole at the end away from the cylindrical outer sidewall is connected to the inner sidewall by a reinforcing bridge, and a boss fixedly connected to the inner sidewall is provided between two adjacent reinforcing bridges.

[0008] Each sector hole contains a main magnetic pole magnet, which is magnetized in parallel along the normal direction of the midpoint of the projection of its surface near the outer wall onto a plane perpendicular to the axis of the outer wall, and the N / S polarities of two adjacent main magnetic pole magnets are opposite.

[0009] Each rectangular hole contains an auxiliary magnetic pole. The magnetization direction of the auxiliary magnetic pole is parallel to the perpendicular line between the sides of the rectangular hole and the two fan-shaped holes, and the N pole of the auxiliary magnetic pole faces the main magnetic pole near the outer wall of the cylinder. The boss and the outer walls on both sides of the notch form a limiting member that limits the radial position of the auxiliary magnetic pole.

[0010] Preferably, the difference between the inner and outer radii of the fan-shaped hole in the radial direction of the cylindrical outer side wall is not greater than the length of the rectangular hole in the radial direction of the cylindrical outer side wall.

[0011] In any of the above schemes, it is preferable that two adjacent reinforcing bridges are symmetrical about the central boss.

[0012] Preferably, in any of the above embodiments, the width of the end of the boss near the outer side wall is not less than 1.5 mm.

[0013] In any of the above embodiments, the boss has a boss hole that extends axially and penetrates along the outer side wall of the cylinder. Two adjacent bosses are connected by a middle ring plate. A gap is left between the middle ring plate and the inner side wall. The rib bridge is fixedly connected to the middle ring plate.

[0014] Preferably, in any of the above embodiments, the boss hole is trapezoidal in cross-section perpendicular to the axis of the outer wall of the cylinder.

[0015] In any of the above embodiments, a circular hole is provided on the frame at the end of the fan-shaped hole away from the outer wall, extending axially along the outer wall of the cylinder and penetrating through it, and the circular hole is not connected to the fan-shaped hole.

[0016] In any of the above embodiments, a connector is provided between the side of the boss near the reinforcing bridge and the side of the reinforcing bridge near the boss. One end of the connector is connected to the side of the boss, and the other end is connected to the end of the reinforcing bridge away from the inner side.

[0017] In any of the above embodiments, a gap is left between the connection point of the connector and the boss and the inner sidewall.

[0018] Preferably, in any of the above embodiments, the width of the notch in the cross section perpendicular to the axis of the outer wall of the cylinder is not less than twice the width of the working air gap between the rotor to which it belongs and the stator of the motor including the rotor.

[0019] Preferably, in any of the above solutions, the thickness of the border between the fan-shaped hole and the rectangular hole ranges from [0.5mm, 1.5mm].

[0020] In any of the above embodiments, the shape of the auxiliary magnetic pole magnet matches the shape of the rectangular hole, and the two are fitted with a clearance.

[0021] In any of the above embodiments, the shape of the main magnetic pole magnet matches the shape of the fan-shaped hole, and the two are fitted with a clearance.

[0022] Preferably, in any of the above embodiments, the end face of the main magnetic pole steel near the outer wall is a plane, and / or the end face of the main magnetic pole steel away from the outer wall is a plane.

[0023] A second aspect of the present invention provides a permanent magnet synchronous motor, including the permanent magnet transverse composite excitation type salient pole rotor.

[0024] The permanent magnet transverse composite excitation type salient pole rotor and motor of the present invention for permanent magnet synchronous motor have the following beneficial effects:

[0025] 1. By using the rotor core cage as an auxiliary structure, permanent magnets with different shapes and magnetization directions are press-fitted together, thereby forming an array-type transverse excitation salient pole rotor.

[0026] 2. The rotor core cage can arrange the magnet material as fully as possible within the limited rotor space, and it can optimize the magnetic circuit to maximize the magnetic focusing effect of the permanent magnet material on the outer surface of the rotor, which greatly increases the air gap magnetic flux density between the stator and rotor of the motor and improves the power density of the motor.

[0027] 3. The rotor core cage forms a saturated magnetic bridge near the rib bridge and inner side wall, which suppresses the leakage magnetic flux within the magnetic poles while efficiently aggregating the main magnetic flux.

[0028] 4. The rotor assembly process is simplified. The main magnetic pole magnets and auxiliary magnetic pole magnets can be inserted into the fan-shaped holes and rectangular holes respectively by insertion, which effectively reduces the cost of mass production of rotors on the assembly line. Attached Figure Description

[0029] Figure 1 This is a schematic cross-sectional view of the rotor core cage of a preferred embodiment of a permanent magnet transverse composite excitation salient pole rotor for a permanent magnet synchronous motor according to the present invention.

[0030] Figure 2 For example, the permanent magnet transverse composite excitation type salient pole rotor for permanent magnet synchronous motor according to the present invention Figure 2 A schematic diagram of the saturation magnetic bridge position of the rotor core cage in the embodiment shown.

[0031] Figure 3 This is a schematic cross-sectional view of the rotor core cage of another embodiment of the permanent magnet transverse composite excitation type salient pole rotor for a permanent magnet synchronous motor according to the present invention.

[0032] Figure 4 For example, the permanent magnet transverse composite excitation type salient pole rotor for permanent magnet synchronous motor according to the present invention Figure 3 A schematic diagram of the saturation magnetic bridge position of the rotor core cage in the embodiment shown.

[0033] Figure 5 This is a schematic cross-sectional view of the rotor core cage of another embodiment of the permanent magnet transverse composite excitation type salient pole rotor for a permanent magnet synchronous motor according to the present invention.

[0034] Figure 6 For example, the permanent magnet transverse composite excitation type salient pole rotor for permanent magnet synchronous motor according to the present invention Figure 5 A schematic diagram of the saturation magnetic bridge position of the rotor core cage in the embodiment shown.

[0035] Figure 7 For example, the permanent magnet transverse composite excitation type salient pole rotor for permanent magnet synchronous motor according to the present invention Figure 5 An exploded view of the embodiment shown.

[0036] Figure 8 For example, the permanent magnet transverse composite excitation type salient pole rotor for permanent magnet synchronous motor according to the present invention Figure 5 A schematic diagram of the cross-sectional structure of the embodiment shown.

[0037] Figure 9 For example, the permanent magnet transverse composite excitation type salient pole rotor for permanent magnet synchronous motor according to the present invention Figure 5 The magnetic field direction and transverse combination of the magnetic poles in the illustrated embodiment are shown in the diagram.

[0038] Figure 10 For example, the permanent magnet transverse composite excitation type salient pole rotor for permanent magnet synchronous motors including the present invention Figure 5 A schematic diagram of the cross-sectional structure of the synchronous motor in the embodiment shown.

[0039] Figure 11 For example, the permanent magnet transverse composite excitation type salient pole rotor for permanent magnet synchronous motors including the present invention Figure 5 A schematic diagram of the magnetic field path of the synchronous motor in the illustrated embodiment.

[0040] In the figure, the component names indicated by the reference numerals are as follows:

[0041] 1-Rotor core cage, 11-Outer side wall, 12-Inner side wall, 13-Fan-shaped hole, 14-Rectangular hole, 15-Notch, 16-Rib bridge, 17-Boss, 18-Boss hole, 19-Middle ring plate, 110-Circular hole, 111-Connector, 2-Main pole magnet, 3-Auxiliary pole magnet. Detailed Implementation

[0042] To better understand the present invention, the following detailed description is provided in conjunction with specific embodiments. First, it should be noted that, unless otherwise specified, the cross-sections mentioned in this application refer to cross-sections perpendicular to the axis of the outer wall of the cylinder; and terms indicating direction such as up, down, left, right, front, and back refer to the directions in the corresponding drawings.

[0043] Example 1

[0044] A permanent magnet transverse quadrature composite excitation type salient pole rotor and motor for permanent magnet synchronous motors, comprising a rotor core cage 1, main pole magnets and auxiliary pole magnets, such as Figure 1As shown, the rotor core cage 1 includes a cylindrical outer wall 11 and an inner wall 12. An even number of annularly arranged sector-shaped holes 13 are equally spaced between the outer wall 11 and the inner wall 12, extending axially and penetrating the cylindrical outer wall 11. Each sector-shaped hole 13 is radially symmetrical along the cylindrical outer wall 11. A rectangular hole 14 extending axially and penetrating the cylindrical outer wall 11 is provided between two adjacent sector-shaped holes 13. A notch 15, penetrating the rectangular hole 14 and extending axially along the cylindrical outer wall 11, is provided on the cylindrical outer wall 11 at its center position corresponding to the rectangular hole 14, for cutting off the leakage magnetic channel of the auxiliary pole magnet. The rectangular hole 14 has no frame on the side closest to the inner wall 12. The frame of the sector-shaped hole 13 away from the cylindrical outer wall 11 is connected to the inner wall 12 via a reinforcing bridge 16, and a boss 17 fixedly connected to the inner wall 12 is provided between two adjacent reinforcing bridges 16.

[0045] Each sector hole 13 is provided with a main magnetic pole magnet. The main magnetic pole magnet is magnetized in parallel along the normal direction of the midpoint of the projection of its surface near the outer wall onto a plane perpendicular to the axis of the outer wall, and the N / S polarities of two adjacent main magnetic pole magnets are opposite.

[0046] Each rectangular hole 14 contains an auxiliary magnetic pole. The magnetization direction of the auxiliary magnetic pole is parallel to the perpendicular line between the sides of the rectangular hole 14 and the two fan-shaped holes 13. The N pole of the auxiliary magnetic pole faces the N pole and is close to the main magnetic pole of the cylindrical outer wall 11. The boss 17 and the outer walls 11 on both sides of the notch 15 form a limiting member that radially limits the position of the auxiliary magnetic pole.

[0047] It should be noted that the width of the notch 15 in the cross-section perpendicular to the axis of the cylindrical outer wall 11 is not less than twice the width of the working air gap between its rotor and the stator of the motor including the rotor, so as to better cut off the leakage magnetic path of the auxiliary pole magnet. The outer walls 11 on both sides of the notch 15 limit the position of the auxiliary pole magnet, so in the cross-section, the width of the notch 15 is smaller than the width of the rectangular hole 14. Preferably, the width of the outer wall 11 protruding from the side of the rectangular hole 14 near the fan-shaped hole 13 is not less than 2 mm, so as to ensure the stability of its limiting constraint on the auxiliary pole magnet.

[0048] It should be further noted that the thickness of the frame between the sector-shaped hole 13 and the rectangular hole 14 is determined based on the rotor's outer diameter and structural strength requirements. Generally, it increases with the increase of the rotor's outer diameter and the improvement of structural strength, and its value ranges from [0.5mm to 1.5mm]. For the same rotor, the thickness of the frame between the sector-shaped hole 13 and the rectangular hole 14 remains consistent.

[0049] In this embodiment, it is preferred that two adjacent reinforcing bridges 16 are symmetrical about the central boss 17; the width of the end of the boss 17 near the outer wall 11 is not less than 1.5 mm; and the distance between the end of the boss 17 near the outer wall 11 and the axis of the cylindrical outer wall 11 is equal to the distance between the end of the fan-shaped hole 13 away from the outer wall 11 and the axis of the cylindrical outer wall 11. That is, in this case, the difference between the inner and outer radii of the fan-shaped hole 13 in the radial direction of the cylindrical outer wall 11 is equal to the length of the rectangular hole 14 in the radial direction of the cylindrical outer wall 11.

[0050] In this embodiment, it is further preferred that, as Figure 1 As shown, the boss 17 has a boss hole 18 extending axially and penetrating along the outer cylindrical wall 11. Two adjacent bosses 17 are connected by a middle ring plate 19. A gap is left between the middle ring plate 19 and the inner wall 12. The rib bridge 16 is fixedly connected to the middle ring plate 19. Preferably, the width of the end of the boss 17 near the outer wall 11 is smaller than the width of the end connected to the inner wall 12. The boss hole 18 is trapezoidal in cross-section perpendicular to the axis of the outer cylindrical wall 11. It should be understood that at this time, the edge of the fan-shaped hole 13 away from the outer cylindrical wall 11 is indirectly connected to the inner wall 12 through the rib bridge 16. That is, the edge of the fan-shaped hole 13 away from the outer cylindrical wall 11 is directly connected to one end of the rib bridge 16, and the other end of the rib bridge 16 is directly connected to the middle ring plate 19. The middle ring plate 19 is directly connected to the boss 17, and the boss 17 is directly connected to the inner wall 12.

[0051] like Figure 2 As shown, through the above structure, on the one hand, the rotor core cage 1 forms a whole in structure; on the other hand, a saturated magnetic bridge is formed between the outer surface of the boss 17 near the rib bridge 16 and the boss hole 18, and between the boss hole 18 and the inner sidewall 12, which effectively suppresses the combined leakage magnetic field of the main magnetic pole and the auxiliary magnetic pole; in particular, the boss hole 18 can further suppress the leakage magnetic field of the auxiliary magnetic pole.

[0052] It should be noted that the trapezoidal shape mentioned above refers to a shape whose upper and / or lower bases are straight lines or arcs, resembling a trapezoid. The purpose of setting the shape of the boss hole 18 to be trapezoidal is to match the shape of the boss 17, so as to form a saturated magnetic bridge. It should be understood that the shape of the boss hole 18 can be adjusted according to the shape of the boss 17, or it can be adjusted independently, as long as the boss hole 18 can suppress the leakage magnetic field of the auxiliary magnetic pole, and the boss hole 18, together with the boss and the inner sidewall, can form a saturated magnetic bridge to suppress the combined leakage magnetic field of the main magnetic pole and the auxiliary magnetic pole. The shape of the boss 17 can also be adjusted as needed, such as the width of the end of the boss 17 near the outer sidewall 11 being not less than the width of the end connected to the inner sidewall 12.

[0053] In the manufacturing process of the rotor core cage 1, several rotor core cage laminations can first be stamped onto cold-rolled electrical steel sheets according to the cross-sectional shape of the rotor core cage, and then these laminations can be stacked to form the rotor core cage. Alternatively, several circular cold-rolled electrical steel sheets can be stacked to form a cylinder, and then corresponding holes can be cut into the cylinder by wire cutting to finally form the rotor core cage. The cold-rolled electrical steel sheets are preferably non-oriented silicon steel sheets.

[0054] For the auxiliary magnetic pole and the main magnetic pole, the shape of the auxiliary magnetic pole matches the shape of the rectangular hole 14, and the two are fitted with a gap; the shape of the main magnetic pole matches the shape of the fan-shaped hole 13, and the two are fitted with a gap. Alternatively, the end face of the main magnetic pole near the outer wall 11 is a plane, and / or the end face of the main magnetic pole away from the outer wall 11 is a plane.

[0055] Each auxiliary and main pole magnet is a pre-cut component according to shape and size requirements. After cutting, the main pole magnets are magnetized in pairs according to N / S polarity, while the auxiliary pole magnets can be magnetized unipolarly. After magnetization, the main and auxiliary pole magnets 3 are inserted one by one into the fan-shaped holes 13 or rectangular holes 14 of the rotor core cage according to polarity requirements. It should be understood that due to the different magnetization directions, the magnetic field directions of the main and auxiliary pole magnets 3 are orthogonal, forming a transversely magnetized rotor. The area enclosed by the inner wall 12 is used to install the motor shaft. The main and auxiliary pole magnets are preferably made of low energy product permanent magnet materials, such as ferrite, and high energy product permanent magnet materials, such as rare earth neodymium iron boron, are preferred.

[0056] It should be noted that due to unavoidable dimensional errors during processing and manufacturing, all magnetic poles and the mating surfaces of their respective holes are pre-reserved with clearance tolerances. During the rotor assembly process, adhesive is applied between the magnetic poles and the holes they are inserted into to bond the magnetic poles to the rotor core cage, thereby enhancing the overall strength of the rotor.

[0057] It should be further explained that, in this embodiment, as Figure 1 As shown, ten sector-shaped holes 13 are provided. The number of sector-shaped holes 13 can be increased or decreased as needed, but should be no less than two. Correspondingly, ten rectangular holes 14 are provided.

[0058] This embodiment also provides a permanent magnet synchronous motor, including the permanent magnet transverse composite excitation type salient pole rotor described in this embodiment.

[0059] Example 2

[0060] This embodiment is similar to Embodiment 1, except that, in this embodiment, as Figure 3As shown, the boss 17 has a small radial dimension on the cylindrical outer side wall 11, making it unsuitable for setting the boss hole 18. Therefore, the boss hole 18 and the middle ring plate 19 in Embodiment 1 are omitted, and the reinforcing bridge 16 is directly fixedly connected to the inner side wall 12. In order to form a saturated magnetic bridge to suppress leakage magnetic flux while making the rotor core cage 1 structurally integral, a circular hole 110 extending axially and penetrating along the cylindrical outer side wall 11 is also provided on the frame of the fan-shaped hole 13 at the end away from the outer side wall. The circular hole 110 is not connected to the fan-shaped hole 13. At the same time, a connector 111 is provided between the side of the boss 17 near the reinforcing bridge 16 and the reinforcing bridge 16 near that side. One end of the connector 111 is connected to that side of the boss 17, and the other end is connected to the end of the reinforcing bridge 16 away from the inner side wall 12. In this embodiment, it is further preferred that a gap is left between the connection point of the connector 111 and the boss 17 and the inner side wall 12. The position of the saturated magnetic bridge formed by the structure described in this embodiment is as follows: Figure 4 As shown.

[0061] It should be noted that, in order to set the circular hole 110, the edge of the fan-shaped hole 13 at the end away from the outer wall should have enough space to accommodate the circular hole 110. At this time, the point where the rib bridge 16 connects with the edge of the fan-shaped hole 13 at the end away from the cylindrical outer wall 11 is located on the side of the circular hole 110 near the inner wall 12.

[0062] according to Figure 3 and Figure 4 It can be confirmed that in this embodiment, the distance between the end of the boss 17 near the outer wall 11 and the axis of the cylindrical outer wall 11 is less than the distance between the end of the fan-shaped hole 13 away from the outer wall 11 and the axis of the cylindrical outer wall 11. That is, in this case, the difference between the inner and outer radii of the fan-shaped hole 13 in the radial direction of the cylindrical outer wall 11 is less than the length of the rectangular hole 14 in the radial direction of the cylindrical outer wall 11.

[0063] The rotor core cage structure described in this embodiment is suitable for rotors of slightly smaller size, especially compared to the rotor in Embodiment 1.

[0064] This embodiment also provides a permanent magnet synchronous motor, including the permanent magnet transverse composite excitation type salient pole rotor described in this embodiment.

[0065] Example 3

[0066] This embodiment is similar to Embodiment 1, except that, in this embodiment, as Figure 5As shown, the boss 17 has a small radial dimension on the cylindrical outer wall 11, making it unsuitable for setting the boss hole 18. Therefore, the boss hole 18 and the middle ring plate 19 in Embodiment 1 are omitted, and the reinforcing bridge 16 is directly fixedly connected to the inner wall 12. To ensure the rotor core cage 1 forms a structurally integral structure while simultaneously forming a saturated magnetic bridge to suppress leakage flux, a circular hole 110 extending axially and penetrating along the cylindrical outer wall 11 is also provided on the edge of the fan-shaped hole 13 at the end away from the outer wall. The circular hole 110 is not connected to the fan-shaped hole 13. Compared to Embodiment 2, the connecting piece 111 between the boss 17 and the reinforcing bridge 16 is omitted. With the above structure in this embodiment, the position of the formed saturated magnetic bridge is as follows... Figure 6 As shown.

[0067] It should be noted that, in order to set the circular hole 110, the edge of the fan-shaped hole 13 at the end away from the outer wall should have enough space to accommodate the circular hole 110. At this time, the point where the rib bridge 16 connects with the edge of the fan-shaped hole 13 at the end away from the cylindrical outer wall 11 is located on the side of the circular hole 110 near the inner wall 12.

[0068] according to Figure 5 and Figure 6 It can be confirmed that in this embodiment, the distance between the end of the boss 17 near the outer wall 11 and the axis of the cylindrical outer wall 11 is less than the distance between the end of the fan-shaped hole 13 away from the outer wall 11 and the axis of the cylindrical outer wall 11. That is, in this case, the difference between the inner and outer radii of the fan-shaped hole 13 in the radial direction of the cylindrical outer wall 11 is less than the length of the rectangular hole 14 in the radial direction of the cylindrical outer wall 11.

[0069] The rotor core cage structure described in this embodiment is suitable for rotors of smaller size, especially compared to the rotor in Embodiment 2.

[0070] It can be seen that the rotor core cage in this embodiment has the simplest structure for achieving integrated rotor core cage structure, forming a saturated magnetic bridge, and suppressing leakage magnetic flux, while the structure used in embodiment 1 is the most complex.

[0071] This embodiment also provides a permanent magnet synchronous motor, including the permanent magnet transverse composite excitation type salient pole rotor described in this embodiment.

[0072] To illustrate the magnetic focusing effect and leakage flux suppression effect of this application, the rotor core cage structure in this embodiment will be used as an example for detailed explanation. The rotor core cage structures in Embodiments 1 and 2 are no less effective than those in this embodiment.

[0073] Figure 7 The diagram shown is an exploded view of a permanent magnet transverse composite excitation salient pole rotor using the rotor core cage in this embodiment. Figure 8 The diagram shown is a schematic cross-sectional structure of a permanent magnet transverse composite excitation type salient pole rotor using the rotor core cage in this embodiment. Figure 9 This is a schematic diagram showing the magnetic field direction and transverse combination of the magnetic poles of the permanent magnet transverse composite excitation type salient pole rotor with rotor core cage in this embodiment.

[0074] according to Figures 7 to 8 As shown, the main magnetic pole 2 is inserted into the fan-shaped hole 13, and the auxiliary magnetic pole 3 is inserted into the rectangular hole 14. During insertion, as... Figure 9 As shown, the N / S polarities of the two adjacent main magnetic poles 2 are opposite, and the N pole of the auxiliary magnetic pole 3 faces the N pole and is close to the main magnetic pole 2 on the cylindrical outer wall 11.

[0075] Figure 10 This is a schematic cross-sectional view of a synchronous motor including the permanent magnet transverse composite excitation type salient pole rotor in this embodiment. Figure 10 It can be seen that a stator is assembled on the outside of the permanent magnet transverse composite excitation type salient pole rotor. In this embodiment, it is preferred that the stator is a twelve-slot parallel tooth stator.

[0076] Figure 11 The results obtained through finite element simulation Figure 10 The diagram shows the magnetic field lines path of the motor. According to... Figure 11 It can be seen that the rotor has alternating N and S poles. Inside the rotor, the S pole corresponds to the inward magnetic field direction of the radially excited sector-shaped main magnetic pole (magnetic lines return to the N pole), and the N pole corresponds to the outward magnetic field direction of the radially excited sector-shaped main magnetic pole (magnetic lines pass through the air gap, the stator teeth and yoke, and then back through the air gap). The air gap main magnetic field completes the closure from N to S with the shortest main magnetic path, forming a pair of poles of air gap magnetic flux. The magnetic focusing effect of the air gap main magnetic circuit is obvious, and the air gap magnetic flux density is greatly increased, thus improving the power density of the motor. Verification has shown that, using the same grade of magnets, compared to rotors with surface-mounted magnets or single sector-shaped magnet rotors, the air gap magnetic flux density can be increased by up to 1.4 times the original value. Figure 11 It can also be seen that the magnetic field lines are distributed at the circular holes connecting the reinforcing bridges to the rotor core cage. The magnetic field of the reinforcing bridges is highly saturated, which forms the saturated magnetic bridge, thereby effectively suppressing the leakage magnetic field within the poles.

[0077] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the foregoing embodiments have described the present invention in detail, those skilled in the art should understand that modifications can be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein, and these substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present invention.

Claims

1. A permanent magnet transverse quadrature composite excitation type salient pole rotor for a permanent magnet synchronous motor, comprising: The rotor core cage, main pole magnets, and auxiliary pole magnets are characterized by: The rotor core cage includes a cylindrical outer sidewall and an inner sidewall. An even number of annularly arranged sector-shaped holes, extending axially and penetrating the cylindrical outer sidewall, are equally spaced between the outer and inner sidewalls. Each sector-shaped hole is radially symmetrical along the cylindrical outer sidewall. A rectangular hole extending axially and penetrating the cylindrical outer sidewall is provided between two adjacent sector-shaped holes. A notch, penetrating the rectangular hole and extending axially along the cylindrical outer sidewall, is provided on the cylindrical outer sidewall at its center position corresponding to the rectangular hole, used to cut off the leakage magnetic path of the auxiliary pole magnet. The side of the rectangular hole closest to the inner sidewall has no frame. The frame of the sector-shaped hole at the end away from the cylindrical outer sidewall is connected to the inner sidewall by a reinforcing bridge, and a boss fixedly connected to the inner sidewall is provided between two adjacent reinforcing bridges. Each sector hole contains a main magnetic pole magnet, which is magnetized in parallel along the normal direction of the midpoint of the projection of its surface near the outer wall onto a plane perpendicular to the axis of the outer wall, and the N / S polarities of two adjacent main magnetic pole magnets are opposite. Each rectangular hole contains an auxiliary magnetic pole. The magnetization direction of the auxiliary magnetic pole is parallel to the perpendicular line between the sides of the rectangular hole and the two fan-shaped holes, and the N pole of the auxiliary magnetic pole faces the main magnetic pole near the outer wall of the cylinder. The boss and the outer walls on both sides of the notch form a limiting member that limits the radial position of the auxiliary magnetic pole.

2. The permanent magnet transverse quadrature composite excitation type salient pole rotor for permanent magnet synchronous motors as described in claim 1, characterized in that: The difference between the inner and outer radii of the fan-shaped hole in the radial direction of the outer wall of the cylinder is not greater than the length of the rectangular hole in the radial direction of the outer wall of the cylinder.

3. The permanent magnet transverse quadrature composite excitation type salient pole rotor for permanent magnet synchronous motors as described in claim 1, characterized in that: Two adjacent reinforcing bridges are symmetrical about the central boss, and the width of the end of the boss near the outer wall is not less than 1.5 mm.

4. The permanent magnet transverse quadrature composite excitation type salient pole rotor for permanent magnet synchronous motors as described in claim 2, characterized in that: The boss has a boss hole that extends axially along the outer side wall of the cylinder and passes through it. Two adjacent bosses are connected by a middle ring plate. There is a gap between the middle ring plate and the inner side wall. The rib bridge is fixedly connected to the middle ring plate.

5. The permanent magnet transverse quadrature composite excitation type salient pole rotor for permanent magnet synchronous motors as described in claim 2, characterized in that: On the side of the fan-shaped hole away from the outer wall, there is also a circular hole that extends axially along the outer wall of the cylinder and passes through it. The circular hole is not connected to the fan-shaped hole.

6. The permanent magnet transverse quadrature composite excitation type salient pole rotor for permanent magnet synchronous motors as described in claim 5, characterized in that: A connector is provided between the side of the boss near the reinforcing bridge and the side of the reinforcing bridge near the boss. One end of the connector is connected to the side of the boss, and the other end is connected to the end of the reinforcing bridge away from the inner side.

7. The permanent magnet transverse quadrature composite excitation type salient pole rotor for permanent magnet synchronous motors as described in claim 1, characterized in that: The width of the notch in the cross section perpendicular to the axis of the outer wall of the cylinder is not less than twice the width of the working air gap between the rotor to which it belongs and the stator of the motor including the rotor.

8. The permanent magnet transverse quadrature composite excitation type salient pole rotor for permanent magnet synchronous motors as described in claim 1, characterized in that: The shape of the auxiliary magnetic pole steel matches the shape of the rectangular hole, and the two are fitted with a clearance.

9. The permanent magnet transverse quadrature composite excitation type salient pole rotor for a permanent magnet synchronous motor as described in claim 1, characterized in that: The shape of the main magnetic pole steel matches the shape of the fan-shaped hole, and the two are fitted with a clearance; or, the end face of the main magnetic pole steel near the outer wall is a plane, and / or, the end face of the main magnetic pole steel away from the outer wall is a plane.

10. A permanent magnet synchronous motor, comprising a permanent magnet transverse composite excitation type salient pole rotor as described in any one of claims 1-9.

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