Motor rotor positioning structure and motor

Abstract

The present invention provides a motor rotor positioning structure and a motor. The motor rotor positioning structure comprises an optical axis (1), a baffle (2), and a rotor core (3) sleeved on the optical axis (1). The optical axis (1) is provided with a shaft shoulder (4) for axially positioning the baffle (2). The rotor core (3) is fixedly connected to the baffle (2). The optical axis (1) is further provided with a first positioning structure and a second positioning structure. The first positioning structure is used to circumferentially position the baffle (2), and the second positioning structure is used to position the magnetizing coil. According to the motor rotor positioning structure of the present invention, the magnetizing positioning of the magnetic steel and the magnetizing coil can be effectively met, the magnetizing direction is ensured to be accurate, and the magnetic field of the rotating shaft after magnetization is consistent with the design expectation.

Description

Technical Field

[0001] The present invention belongs to the technical field of motors, and in particular relates to a motor rotor positioning structure and a motor. Background Art

[0002] like Figure 1 As shown, the existing high-speed motor shaft structure comprises an optical axis 1, a front rotor baffle 2, a rotor core 3, a magnet 4 and a rear rotor baffle 5. The existing high-speed motor shaft manufacturing process is to heat the rear rotor baffle 5 and the rotor core 3 to fit onto the optical axis 1, use the shoulder position of the optical axis 1 for positioning, then assemble the magnetic magnet 4 into the rotor core 3, and finally assemble the front rotor baffle 2.

[0003] This assembly method has the following defects: ① The magnets are assembled with magnets, which have strong magnetism, making assembly difficult and inefficient. Moreover, as the rotor stack height increases, the more magnets are assembled, the lower the production efficiency. ② Due to the large number of magnets, the magnets are easily installed upside down during the assembly process. If not discovered in time, the magnets are fixed and installed upside down, resulting in distortion of the magnetic flux waveform and vibration during motor operation. ③ The dynamic balance correction of the shaft with magnets will affect the dynamic balance data, making it impossible to obtain a stable value.

[0004] In order to solve the above problems, the prior art provides a post-magnetization manufacturing process for the high-speed motor shaft, that is, first completing the front rotor baffle 2, the rear rotor baffle 5, the rotor core 3, and the unmagnetized magnet 4 (the magnet is not magnetic at this time, but has orientation), and then performing a dynamic balance check on the shaft, and finally using a magnetizing power supply and a magnetizing coil fixture to post-magnetize the shaft; this process can increase production efficiency and avoid product defects caused by reverse installation of magnets. The shaft can be dynamically balanced first to improve correction efficiency and accuracy.

[0005] However, since the magnetization coil's magnetization direction is fixed after fabrication, the relative position of the magnets and magnetization coils within each motor's rotor positioning structure must be consistent when using the post-magnetization process to achieve post-magnetization shaft production. Otherwise, due to the fixed magnetization orientation and position of the magnets within the rotor core, the magnetic field after magnetization will deviate significantly from the design expectations. Therefore, magnetization positioning design is particularly important for post-magnetization high-speed motor shafts. Summary of the Invention

[0006] Therefore, the technical problem to be solved by the present invention is to provide a motor rotor positioning structure and a motor, which can effectively meet the magnetization positioning of the magnet and the magnetization coil, ensure the accuracy of the magnetization direction, and make the magnetic field of the shaft after magnetization consistent with the design expectations.

[0007] In order to solve the above problems, the present invention provides a motor rotor positioning structure, including an optical axis, a baffle and a rotor core sleeved on the optical axis, the optical axis is provided with a shaft shoulder for axially positioning the baffle, the rotor core is fixedly connected to the baffle, and the optical axis is also provided with a first positioning structure and a second positioning structure, the first positioning structure is used to circumferentially position the baffle, and the second positioning structure is used to position the magnetizing coil.

[0008] Preferably, the first positioning structure includes a positioning boss provided on the shaft shoulder, the positioning boss protrudes axially toward the baffle, and the baffle is provided with a positioning groove matched with the positioning boss.

[0009] Preferably, the positioning boss and the positioning groove are clearance-fitted.

[0010] Preferably, the positioning boss is a rectangular block, the positioning groove matches the shape of the positioning boss, the radial height of the positioning boss is smaller than the radial height of the positioning groove, the axial length of the positioning boss is smaller than the axial length of the positioning groove; and / or, the circumferential width of the positioning boss is smaller than the circumferential width of the positioning groove.

[0011] Preferably, there are multiple positioning bosses, and the multiple positioning bosses are evenly distributed along the circumference of the shaft shoulder.

[0012] Preferably, the first positioning structure includes a positioning groove provided on the shaft shoulder, and the baffle is provided with a positioning boss extending toward the shaft shoulder, and the positioning boss cooperates with the positioning groove.

[0013] Preferably, axially penetrating positioning holes are correspondingly provided on the baffle and the rotor core.

[0014] Preferably, the second positioning structure includes a positioning keyway provided at an end of the optical axis away from the shaft shoulder.

[0015] Preferably, the second positioning structure includes a positioning key block arranged at an end of the optical axis away from the shaft shoulder.

[0016] According to another aspect of the present invention, a motor is provided, comprising a motor rotor positioning structure, wherein the motor rotor positioning structure is the above-mentioned motor rotor positioning structure.

[0017] The motor rotor positioning structure provided by the present invention includes an optical axis, a baffle and a rotor core sleeved on the optical axis. A shaft shoulder for axially positioning the baffle is provided on the optical axis. The rotor core is fixedly connected to the baffle. A first positioning structure and a second positioning structure are also provided on the optical axis. The first positioning structure is used to circumferentially position the baffle, and the second positioning structure is used to position the magnetizing coil. The optical axis of the motor rotor positioning structure is provided with structures for positioning the baffle and the magnetizing coil respectively. Therefore, during the post-magnetization process, the installation positions of the baffle and the magnetizing coil can be positioned with the optical axis as a reference. Since the baffle is fixedly connected to the rotor core, and the magnet is fixedly arranged on the rotor core, when the position of the baffle relative to the optical axis is determined, the position of the magnet relative to the optical axis is also determined accordingly, that is, the relative positions of the magnet and the magnetizing coil can be conveniently and accurately positioned through the optical axis, thereby ensuring the accuracy of the magnetization direction and making the magnetic field of the rotating shaft after magnetization consistent with the design expectation. Since the magnetizing coil is large in size, heavy in mass and easy to be damaged, this solution can also avoid the coil damage and waste of work time caused by the traditional rotating magnetizing coil for positioning, thereby improving the production efficiency and reliability of the motor rotor positioning structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic cross-sectional view of a motor rotor positioning structure in the prior art;

[0019] Figure 2 This is a schematic diagram of the exploded structure of the motor rotor positioning structure according to an embodiment of the present invention;

[0020] Figure 3 A schematic diagram of the three-dimensional structure of the optical axis of the motor rotor positioning structure according to an embodiment of the present invention;

[0021] Figure 4 for Figure 3 Schematic diagram of the enlarged structure at Q;

[0022] Figure 5 A schematic structural diagram of the optical axis of the motor rotor positioning structure according to an embodiment of the present invention;

[0023] Figure 6 A schematic side view of the optical axis of the motor rotor positioning structure according to an embodiment of the present invention;

[0024] Figure 7 A schematic cross-sectional view of a baffle of a motor rotor positioning structure according to an embodiment of the present invention;

[0025] Figure 8 This is a schematic top view of the baffle of the motor rotor positioning structure according to an embodiment of the present invention.

[0026] The reference numerals indicate:

[0027] 1. Optical axis; 2. Baffle; 3. Rotor core; 4. Shaft shoulder; 5. Positioning boss; 6. Positioning groove; 7. Positioning hole; 8. Positioning keyway. DETAILED DESCRIPTION

[0028] See also Figures 2 to 8 As shown, according to an embodiment of the present invention, the motor rotor positioning structure includes an optical axis 1, a baffle 2 and a rotor core 3 sleeved on the optical axis 1, a shaft shoulder 4 for axially positioning the baffle 2 is provided on the optical axis 1, the rotor core 3 is fixedly connected to the baffle 2, and a first positioning structure and a second positioning structure are also provided on the optical axis 1, the first positioning structure is used to circumferentially position the baffle 2, and the second positioning structure is used to position the magnetizing coil.

[0029] The optical axis 1 of the motor rotor positioning structure is provided with structures for positioning the baffle 2 and the magnetizing coil respectively. Therefore, during the post-magnetization process, the installation positions of the baffle 2 and the magnetizing coil can be positioned with the optical axis 1 as the reference. Since the baffle 2 is fixedly connected to the rotor core 3, and the rotor punchings are fixed in the design of the magnetic steel slot type and relative position, the positioning of the rotor core 3 and the magnetic steel does not need to be specially solved. Therefore, when the position of the baffle 2 relative to the optical axis 1 is determined, the position of the magnetic steel relative to the optical axis 1 is also determined accordingly, that is, the magnetic steel and the magnetizing coil can be conveniently and accurately positioned through the optical axis 1. The relative positions of the rotor core 3 and the magnet are finally positioned, the rotor core 3 and the baffle 2 are positioned, the baffle 2 and the optical axis 1 are positioned, and the optical axis 1 and the magnetizing coil fixture are positioned, so that the relative positions of the (unmagnetized) magnets and the magnetizing coils inside each high-speed motor shaft are fixed and consistent, ensuring the accuracy of the magnetization direction and making the magnetic field of the shaft after magnetization consistent with the design expectations; since the magnetizing coil is large in size, heavy in mass and easy to be damaged, this solution can also avoid the coil damage and waste of work time caused by the traditional rotation of the magnetizing coil for positioning, thereby improving the production efficiency and reliability of the motor rotor positioning structure.

[0030] In this embodiment, the first positioning structure includes a positioning boss 5 provided on the shaft shoulder 4. The positioning boss 5 protrudes axially toward the baffle 2. The baffle 2 is provided with a positioning groove 6 that cooperates with the positioning boss 5. When positioning the baffle 2 and the optical axis 1, it is only necessary to align the positioning groove 6 on the baffle 2 with the positioning boss 5 on the optical axis 1 and engage the positioning groove 6 with the positioning boss 5. At the same time, the shaft shoulder 4 is used to axially position the baffle 2, thereby completing the circumferential and axial positioning between the optical axis 1 and the baffle 2.

[0031] Preferably, the positioning boss 5 and the positioning groove 6 are clearance-fitted, so that the positioning boss 5 and the positioning groove 6 can be conveniently installed and matched, thereby reducing assembly difficulty and improving installation efficiency.

[0032] The positioning boss 5 is a rectangular block, and the positioning groove 6 matches the shape of the positioning boss 5 . The radial height L1 of the positioning boss 5 is smaller than the radial height L2 of the positioning groove 6 . The axial length H1 of the positioning boss 5 is smaller than the axial length H2 of the positioning groove 6 .

[0033] By setting the above-mentioned dimensional relationship, it is possible to avoid the positioning boss 5 being designed too large, which may lead to failure of the rotor shrink fit, or improper axial assembly resulting in unsaturated magnetization.

[0034] Preferably, the circumferential width S1 of the positioning boss 5 is smaller than the circumferential width S2 of the positioning groove 6, so that the positioning boss 5 and the positioning groove 6 form a small clearance fit in the circumferential direction, which can facilitate the circumferential positioning between the rotor core 3 and the optical axis 1.

[0035] The positioning boss 5 can also be a semi-cylinder, a triangular prism or a projection of other shapes. In this embodiment, the positioning boss 5 extends from the outer peripheral wall of the optical axis 1 to the outer peripheral wall of the shaft shoulder 4 along the radial direction, ensuring that the positioning boss 5 has sufficient length in the radial direction, thereby providing sufficient structural strength.

[0036] Preferably, there are multiple positioning bosses 5, and the multiple positioning bosses 5 are evenly distributed along the circumference of the shoulder 4, which can make the force acting on the shoulder 4 in the circumferential direction more balanced, and avoid deformation and damage of individual positioning bosses 5 due to uneven force on each positioning boss 5.

[0037] In another embodiment not shown, the first positioning structure includes a positioning groove 6 provided on the shaft shoulder 4 , and a positioning boss 5 extending toward the shaft shoulder 4 is provided on the baffle 2 , and the positioning boss 5 cooperates with the positioning groove 6 .

[0038] Axially extending positioning holes 7 are provided on the baffle 2 and the rotor core 3, respectively. The rotor core 3 and the baffle 2 can be fixedly connected using screws or the like inserted through the positioning holes 7. The positioning holes 7 on the baffle 2 and the rotor core 3 are located on the same circumference centered on the central axis of the rotor core 3 and are distributed in the same circumferential direction along this circumference, thereby facilitating the secure connection between the rotor core 3 and the baffle 2.

[0039] In this embodiment, the second positioning structure includes a positioning key groove 8 provided at an end of the optical axis 1 away from the shaft shoulder 4 .

[0040] In another embodiment not shown, the second positioning structure includes a positioning key block provided at an end of the optical axis 1 away from the shaft shoulder 4 .

[0041] By setting a second positioning structure on the optical axis 1, a structure that cooperates with the second positioning structure can be machined on the magnetizing coil fixture, and finally the magnetizing coil and the positioning structure on the optical axis 1 are used to ensure the accuracy of the magnetization direction.

[0042] Because the rotor laminations' magnetic slot patterns and relative positions are fixed after design, no special solutions are required for the positioning of the rotor core 3 and the magnets. During assembly, baffle 2 and rotor core 3 are assembled together, then attached to optical axis 1. Positioning is achieved using the alignment between optical axis 1 and baffle 2. Finally, the relative position of the magnetizing coil and optical axis 1 is determined using the positioning keyway 8 on optical axis 1.

[0043] According to an embodiment of the present invention, the motor includes a motor rotor positioning structure, which is the above-mentioned motor rotor positioning structure.

[0044] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0045] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention. The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art may make various improvements and variations without departing from the technical principles of the present invention, and such improvements and variations shall also be considered within the scope of protection of the present invention.

Claims

1. A motor rotor positioning structure, characterized in that: The invention comprises an optical axis (1), a baffle (2) and a rotor core (3) sleeved on the optical axis (1); the optical axis (1) is provided with a shaft shoulder (4) for axially positioning the baffle (2); the rotor core (3) is fixedly connected to the baffle (2); the optical axis (1) is also provided with a first positioning structure and a second positioning structure; the first positioning structure is used for circumferentially positioning the baffle (2); and the second positioning structure is used for positioning the magnetizing coil.

2. The motor rotor positioning structure according to claim 1, characterized in that: The first positioning structure comprises a positioning boss (5) provided on the shaft shoulder (4), the positioning boss (5) protruding axially toward the baffle (2), and a positioning groove (6) matching the positioning boss (5) is provided on the baffle (2).

3. The motor rotor positioning structure according to claim 2, characterized in that: The positioning boss (5) and the positioning groove (6) are clearance-fitted.

4. The motor rotor positioning structure according to claim 3, characterized in that: The positioning boss (5) is a rectangular block, the positioning groove (6) matches the shape of the positioning boss (5), the radial height of the positioning boss (5) is smaller than the radial height of the positioning groove (6), the axial length of the positioning boss (5) is smaller than the axial length of the positioning groove (6); and / or the circumferential width of the positioning boss (5) is smaller than the circumferential width of the positioning groove (6).

5. The motor rotor positioning structure according to claim 2, characterized in that: There are multiple positioning bosses (5), and the multiple positioning bosses (5) are evenly distributed along the circumference of the shaft shoulder (4).

6. The motor rotor positioning structure according to claim 1, characterized in that: The first positioning structure comprises a positioning groove (6) provided on the shaft shoulder (4); a positioning boss (5) extending toward the shaft shoulder (4) is provided on the baffle (2); the positioning boss (5) cooperates with the positioning groove (6).

7. The motor rotor positioning structure according to any one of claims 1 to 6, characterized in that: Axially penetrating positioning holes (7) are correspondingly provided on the baffle (2) and the rotor core (3).

8. The motor rotor positioning structure according to any one of claims 1 to 6, characterized in that: The second positioning structure comprises a positioning keyway (8) arranged at an end of the optical axis (1) away from the shaft shoulder (4).

9. The motor rotor positioning structure according to any one of claims 1 to 6, characterized in that: The second positioning structure comprises a positioning key block arranged at an end of the optical axis (1) away from the shaft shoulder (4).

10. A motor, comprising a motor rotor positioning structure, characterized in that: The motor rotor positioning structure is the motor rotor positioning structure according to any one of claims 1 to 9.

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