Outer rotor synchronous motor rotor structure with magnets arranged in V shape and motor

Abstract

The invention relates to the field of motors, and discloses an outer rotor synchronous motor rotor structure with magnets arranged in a V shape and a motor, and the outer rotor synchronous motor rotor structure comprises an outer rotor iron core, magnetic conductive iron cores, permanent magnets, supporting strips and fastening strips; the inner side of the outer rotor is provided with an annular groove which is distributed along the circumferential direction of the inner ring of the outer rotor iron core. The outer rotor iron core, the magnetic conductive iron core, the permanent magnets, the supporting strips and the fastening strips are installed in the groove. The fastening strip, the permanent magnet a, the supporting strip and the permanent magnet b are sequentially connected, the permanent magnet a and the permanent magnet b form an installation opening with an opening facing the inner ring of the outer rotor iron core, the magnetic conductive iron core is installed in the installation opening in a filling mode, the magnetic conductive iron core, the fastening strip, the permanent magnet a, the supporting strip and the permanent magnet b form magnetic conductive sets, and the adjacent magnetic conductive sets are sequentially connected along the track of the groove. The grooves are filled with the magnetic conductive groups which are connected in sequence, and an annular surface is formed on one side close to the stator. The rotor structure has the advantages of compact structure, large motor torque, few used permanent magnets and the like.

Description

Technical Field

[0001] The present invention relates to the field of motors, and in particular to an outer rotor synchronous motor rotor structure with V-shaped magnet arrangement and a motor. Background Art

[0002] The motor is an electrical component used to achieve energy conversion. Among them, the permanent magnet synchronous motor uses permanent magnets to provide excitation, and the outer rotor hub motor removes the gear transmission part, has excellent performance and is widely used in new energy vehicles. Chinese patent application CN115694020A discloses a small surface-mounted outer rotor synchronous motor rotor structure with triangular magnets. The magnet arrangement of the outer rotor structure has limited improvement on the magnetic field strength. Summary of the invention

[0003] In view of the shortcomings of the prior art, the present invention provides an outer rotor synchronous motor rotor structure with magnets arranged in a V shape.

[0004] In order to solve the above technical problems, the present invention is solved by the following technical solutions:

[0005] An outer rotor synchronous motor rotor structure with V-shaped magnet arrangement, comprising an outer rotor iron core, a magnetic conductive core, a permanent magnet, a support bar and a fastening bar;

[0006] The inner side of the outer rotor is provided with an annular groove distributed along the circumferential direction of the inner ring of the outer rotor core. The outer rotor core, the magnetic conductive core, the permanent magnet, the support bar and the fastening bar are installed in the groove; the support bar, the permanent magnet b, the fastening bar and the permanent magnet a are connected in sequence, and the permanent magnet a and the permanent magnet b form an installation opening with an opening facing the inner ring of the outer rotor core. The magnetic conductive core is filled and installed in the installation opening and forms a magnetic conductive group with the fastening bar, the permanent magnet a, the support bar and the permanent magnet b. Adjacent magnetic conductive groups are connected in sequence along the groove track, and the magnetic conductive groups connected in sequence fill the groove and form an annular surface on the side close to the stator.

[0007] Preferably, the angle of the installation opening is 110° to 160°, and the permanent magnet a and the permanent magnet b of the adjacent magnetic conductive group form an angle with the opening facing the outer ring surface of the outer rotor core, and the angle is 110° to 160°.

[0008] Preferably, the cross section of the permanent magnet is rectangular, the cross section of the support bar is triangular, and the cross section of the fastening bar is trapezoidal.

[0009] Preferably, the cross section of the magnetic conductive core is triangular, and the magnetic conductive core is a triangular prism formed by stacking a plurality of triangular laminations.

[0010] Preferably, the width of the magnetically conductive core is equal to the width of the stator tooth surface.

[0011] Preferably, the materials of the support strips and the fastening strips are both magnetic isolation materials, and the support strips, the fastening strips and the permanent magnets are all glued and fixed.

[0012] Preferably, the support bar and the fastening bar are both aluminum bars, and the ends of the support bar and the fastening bar are connected by annular aluminum end caps.

[0013] Preferably, the permanent magnet is a neodymium iron boron magnet, and the ratio of the thickness to the width of the magnet unit is 1 / 2.

[0014] A motor is equipped with an outer rotor synchronous motor rotor structure with magnets arranged in a V shape as described above.

[0015] The present invention has the following significant technical effects due to the adoption of the above technical solution:

[0016] The present invention designs an outer rotor synchronous motor rotor structure with V-shaped magnet arrangement. The present invention can reduce the use of permanent magnets, enhance the air gap flux density, and increase the motor torque. Compared with motors using traditional surface-mounted rectangular magnets, the present invention can increase the torque by about 8% while using 81% of the traditional motor magnets, reduce the use of permanent magnets, optimize the magnetic circuit, and increase the motor torque. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is the structural diagram of the stator and outer rotor.

[0018] Figure 2 3D image of the rotor structure with one end cover removed.

[0019] Figure 3 It is the magnetic field line diagram at time 0 in Example 1.

[0020] The technical names of the reference numerals in the figure are: 1-outer rotor core, 2-magnetic core, 3-permanent magnet, 4-support bar, 5-fastening bar, 31-permanent magnet a, 6-groove, 32-permanent magnet b, 7-installation port. DETAILED DESCRIPTION

[0021] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0022] Example 1

[0023] A rotor structure of an outer rotor synchronous motor with V-shaped magnet arrangement includes an outer rotor core 1, a magnetic permeable core 2, a permanent magnet 3, a support bar 4 and a fastening bar 5; wherein the electronic rotor structure is an annular structure as a whole and surrounds the outside of the stator. The outer rotor core 1 is used as a skeleton to support the other components, and the inner ring side of the outer rotor core 1 is provided with an installation groove, i.e., a groove 6, for installing the other components. The installed rotor structure is roughly an annular part.

[0024] The inner side of the outer rotor is provided with an annular groove 6 distributed along the circumferential direction of the inner ring of the outer rotor core 1. The outer rotor core 1, the permeable core 2, the permanent magnet 3, the support bar 4 and the fastening bar 5 are installed in the groove 6; the support bar 4, the permanent magnet b32, the fastening bar 5, and the permanent magnet a31 are connected in sequence, and the permanent magnet a31 and the permanent magnet b32 form an installation opening 7 with an opening toward the inner ring of the outer rotor core 1. The permeable core 2 is filled and installed in the installation opening 7 and forms a permeable group with the fastening bar 5, the permanent magnet a31, the support bar 4, and the permanent magnet b32. Adjacent permeable groups are connected in sequence along the groove 6 track. The permeable groups connected in sequence fill the groove 6 and form an annular surface on the side close to the stator. The permanent magnet a31 and the permanent magnet b32 are both permanent magnets 3, and the two have the same structure. The main purpose of distinguishing the definition is to facilitate the orientation. The permeable group does not mean that the part is a single isolated unit. It is mainly for the convenience of describing the above-mentioned components arranged in a cycle, which is a cycle unit. Of course, when choosing different starting points, there will be different orders of loop units.

[0025] In this embodiment, the angle α of the mounting opening 7 is 110° to 160°, and the permanent magnet a31 and the permanent magnet b32 of the adjacent magnetic conductive group form an angle β with the opening facing the outer ring surface of the outer rotor core 1, and the angle β is 110° to 160°.

[0026] The cross section of the permanent magnet 3 is rectangular, the cross section of the support bar 4 is triangular, and the cross section of the fastening bar 5 is trapezoidal. The materials of the support bar 4 and the fastening bar 5 are all magnetic isolation materials, and the support bar 4, the fastening bar 5 and the permanent magnet are all glued and fixed. The support bar 4 and the fastening bar 5 are both aluminum bars, and the ends of the support bar 4 and the fastening bar 5 are connected with annular aluminum end caps to play a fixing role. In this scheme, aluminum bars are filled between the magnets to ensure the overall strength. At the same time, since the magnetic permeability of aluminum is similar to that of air, it can play a role in magnetic isolation and optimize the magnetic circuit as a whole. Using V-arrangement plus aluminum bar magnetic isolation can guide the magnetic lines of force from the surface of the magnetic core 2 through the air gap and flow into the stator to form a relatively uniform and smooth magnetic circuit. Compared with motors using traditional surface-mounted rectangular magnets, this invention can increase the torque by about 8% while using 81% of the traditional motor magnets, reduce the use of permanent magnets 3, optimize the magnetic circuit, and increase the motor torque.

[0027] In this embodiment, the cross-section of the conductive core 2 is triangular. The conductive core 2 is a triangular prism formed by stacking a plurality of triangular laminations and is welded at the side edges or sides to increase the strength. The width of the conductive core 2 is roughly equal to the width of the stator tooth surface to achieve maximum torque.

[0028] Example 2

[0029] On the basis of Example 1, the permanent magnet 3 of this example is a neodymium iron boron magnet, and the ratio of the thickness to the width of the magnet unit is 1 / 2.

[0030] Example 3

[0031] A motor is equipped with an outer rotor synchronous motor rotor structure with a V-shaped arrangement of magnets as described in any of the above-mentioned embodiments.

Claims

1. An outer rotor synchronous motor rotor structure with V-shaped magnet arrangement, characterized in that: It comprises an outer rotor core (1), a magnetic permeable core (2), a permanent magnet (3), a support bar (4) and a fastening bar (5); The inner side of the outer rotor is provided with an annular groove (6) distributed along the circumferential direction of the inner ring of the outer rotor core (1); the outer rotor core (1), the magnetic core (2), the permanent magnet (3), the support bar (4) and the fastening bar (5) are installed in the groove (6); the support bar (4), the permanent magnet b (32), the fastening bar (5) and the permanent magnet a (31) are connected in sequence; the permanent magnet a (31) and the permanent magnet b (32) form an installation opening (7) with an opening facing the inner ring of the outer rotor core (1); the magnetic core (2) is filled and installed in the installation opening (7) and forms a magnetic conductive group with the fastening bar (5), the permanent magnet a (31), the support bar (4) and the permanent magnet b (32); adjacent magnetic conductive groups are connected in sequence along the track of the groove (6); the magnetic conductive groups connected in sequence fill the groove (6) and form an annular surface on the side close to the stator.

2. The outer rotor synchronous motor rotor structure with V-shaped magnet arrangement according to claim 1, characterized in that: The permanent magnet a (31) and the permanent magnet b (32) of the adjacent magnetic conductive group form an angle β with the opening facing the outer ring surface of the outer rotor core (1), and the angle β is 110° to 160°.

3. The outer rotor synchronous motor rotor structure with V-shaped magnet arrangement according to claim 1, characterized in that: The angle of the installation opening (7) is 110° to 160°.

4. The outer rotor synchronous motor rotor structure with V-shaped magnet arrangement according to claim 1, characterized in that: The cross section of the permanent magnet (3) is rectangular, the cross section of the support bar (4) is triangular, and the cross section of the fastening bar (5) is trapezoidal.

5. The outer rotor synchronous motor rotor structure with V-shaped magnet arrangement according to claim 1, characterized in that: The cross section of the magnetic conductive core (2) is a triangle, and the magnetic conductive core (2) is a triangular prism formed by stacking a plurality of triangular laminated sheets.

6. The outer rotor synchronous motor rotor structure with V-shaped magnet arrangement according to claim 1, characterized in that: The width of the magnetic permeable core (2) is equal to the width of the stator tooth surface.

7. The outer rotor synchronous motor rotor structure with V-shaped magnet arrangement according to claim 1 or 2 or 3 or 4 or 5 or 6, characterized in that: The materials of the support strip (4) and the fastening strip (5) are both magnetic isolation materials, and the support strip (4), the fastening strip (5) and the permanent magnet are all fixed by gluing.

8. The outer rotor synchronous motor rotor structure with V-shaped magnet arrangement according to claim 6, characterized in that: The support bar (4) and the fastening bar (5) are both aluminum bars, and the ends of the support bar (4) and the fastening bar (5) are connected by an annular aluminum end cap.

9. The outer rotor synchronous motor rotor structure with V-shaped magnet arrangement according to claim 1, characterized in that: The permanent magnet (3) is a neodymium iron boron magnet, and the ratio of the thickness to the width of the magnet unit is 1 / 2.

10. The motor is characterized by: An outer rotor synchronous motor rotor structure equipped with a V-shaped arrangement of magnets as described in any one of claims 1 to 9.

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