Rotor lamination for a single-pole electric machine and single-pole electric machine

Abstract

The utility model discloses a rotor lamination of unipolar motor and unipolar motor, the end face of rotor lamination is provided with at least two magnetic steel grooves along the circumferential interval, the end face of rotor lamination still has the arc lightening hole of extending along the circumferential direction of rotor lamination, the arc lightening hole is located the inside of magnetic steel groove and is set up with magnetic steel groove one to one, the corresponding central angle of arc lightening hole on rotor lamination is same with the corresponding central angle of magnetic steel groove on rotor lamination. The corresponding central angle of arc lightening hole on rotor lamination is configured to be same with the corresponding central angle of magnetic steel groove on rotor lamination, can block the conduction path of the magnetic force line of motor shaft to the center of rotor lamination of permanent magnet, reduces the magnetic flux leakage, reduces the torque fluctuation, reduces the vibration noise. The arc lightening hole can also guide the magnetic force line from the permanent magnet pole smooth conduction to the silicon steel pole, avoids the local magnetic force saturation.

Description

Technical Field

[0001] This utility model relates to a rotor lamination for a unipolar motor and a unipolar motor. Background Technology

[0002] Compared to traditional permanent magnet motors, existing alternating pole motors can reduce the number of magnets by half, but they suffer from significant magnetic leakage, torque fluctuations, and higher noise levels. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the defects in the prior art and provide a rotor lamination for a unipolar motor and a unipolar motor.

[0004] The present invention solves the above-mentioned technical problems through the following technical solution:

[0005] A rotor lamination for a unipolar motor, wherein at least two magnet slots are spaced apart circumferentially on the end face of the rotor lamination, and the end face of the rotor lamination also has an arc-shaped weight-reducing hole extending along the circumferential direction of the rotor lamination. The arc-shaped weight-reducing hole is located inside the magnet slot and is arranged in a one-to-one correspondence with the magnet slot. The central angle of the arc-shaped weight-reducing hole on the rotor lamination is the same as the central angle of the magnet slot on the rotor lamination.

[0006] In this design, the central angle of the arc-shaped weight-reducing hole on the rotor lamination is configured to be the same as the central angle of the magnet slot on the rotor lamination. This blocks the transmission path of the magnetic field lines from the permanent magnet to the motor shaft at the center of the rotor lamination, reducing magnetic leakage, torque fluctuation, and vibration noise. The arc-shaped weight-reducing hole also guides the magnetic field lines smoothly from the permanent magnet poles to the silicon steel poles, avoiding local magnetic saturation. Furthermore, it reduces the weight of the rotor laminations, thereby reducing the overall weight and cost of the motor. Especially in high-power motors, reducing rotor inertia can significantly improve the response speed and energy efficiency of the control system. The arc-shaped weight-reducing hole also balances the weight of the rotor laminations, enhancing the motor's operational stability. Additionally, it increases the surface area of ​​the rotor laminations, promoting heat transfer, enhancing the motor's heat dissipation performance, and ensuring stable long-term operation.

[0007] Preferably, the magnetic slot is used to mount permanent magnets to form alternating silicon steel poles and permanent magnet poles on the outer peripheral surface of the rotor lamination. The permanent magnet poles correspond one-to-one with the magnetic slots, the silicon steel poles are located between adjacent permanent magnet poles, and the permanent magnet poles have a first axis of symmetry passing through the center of the rotor lamination. The arc-shaped weight reduction hole is symmetrical with respect to the first axis of symmetry.

[0008] In this scheme, the arc-shaped weight reduction hole is symmetrical with respect to the first axis of symmetry, which improves the symmetry of the magnetic flux density distribution of adjacent silicon steel poles, matches the magnetic reluctance characteristics of the silicon steel poles and permanent magnet poles, and improves uniformity.

[0009] Preferably, the arc-shaped weight-reducing hole includes a first arc segment and a second arc segment, the centers of which coincide with the center of the rotor lamination. The first arc segment and the second arc segment form the arc-shaped weight-reducing hole, and the radius of the first arc segment is... The range of values ​​is The radius of the second arc segment The range of values ​​is ,in, The radius of the rotor lamination is denoted as .

[0010] In this design, the arc-shaped weight-reducing hole includes a first arc segment and a second arc segment, and the centers of both the first and second arc segments coincide with the center of the rotor lamination, facilitating the fabrication of the arc-shaped weight-reducing hole. The radius of the first arc segment... The range of values ​​is set to The radius of the second arc segment The range of values ​​is set to This allows the size of the arc-shaped weight-reducing hole to be correlated with the radius of the rotor lamination, so that the size of the arc-shaped weight-reducing hole changes with the radius of the rotor lamination. and radius The value can be directly obtained to determine the width variation range of the arc-shaped weight reduction hole. If the width of the arc-shaped weight reduction hole is set too large, it will reduce the strength of the rotor lamination; if the width of the arc-shaped weight reduction hole is set too small, it will be difficult to guide the direction of the magnetic lines of force and reduce the weight of the rotor lamination.

[0011] Preferably, the end face of the rotor lamination also has a spindle-shaped hole, which is disposed between adjacent arc-shaped weight-reducing holes and extends along the radial direction of the rotor lamination.

[0012] In this design, the spindle-shaped hole is used not only to reduce the weight of the rotor lamination, but also to block the path of magnetic lines of force from the area between adjacent arc-shaped weight-reducing holes to the drive shaft of the rotor lamination, thus preventing magnetic leakage.

[0013] Preferably, the silicon steel pole has a second axis of symmetry passing through the center of the rotor lamination, and the spindle-shaped hole is symmetrical with respect to the second axis of symmetry.

[0014] In this design, the spindle-shaped aperture is symmetrical with respect to the second axis of symmetry, which facilitates the guidance of the magnetic field lines on both sides of the spindle-shaped aperture, allowing the magnetic field lines to flow smoothly and the magnetic flux density to be evenly distributed.

[0015] Preferably, the spindle-shaped hole includes a pointed section, two connecting sections and a third arc section, with the two ends of the two connecting sections respectively connected to the pointed section and the third arc section. The pointed section is close to the outer side of the rotor lamination, and the third arc section is close to the center of the rotor lamination.

[0016] In this design, the tip of the spindle-shaped hole is oriented towards the outside of the rotor lamination, which allows the magnetic lines of force to flow smoothly, increases the sinusoidality of the air gap magnetic field, reduces torque fluctuations, and achieves the goal of reducing vibration and noise.

[0017] By setting the third arc segment of the spindle-shaped hole towards the center of the rotor lamination, the surface area of ​​the rotor lamination is increased, improving heat dissipation efficiency. At the same time, this setting also facilitates the processing and fabrication of the spindle-shaped hole without reducing the strength of the rotor lamination.

[0018] Preferably, the angle between the connecting segment and the second axis of symmetry The value is The radius of the apex of the tip segment in the rotor lamination The range of values ​​is The radius of the point of the third arc segment near the center of the rotor lamination in the rotor lamination. The range of values ​​is ,

[0019] Where P is the number of magnetic slots. The radius of the rotor lamination is denoted as .

[0020] In this design, the angle between the connecting segment and the second axis of symmetry The value is Since P represents the number of magnetic slots, the angle between the connecting section and the second axis of symmetry is related to the number of magnetic slots. If the number of magnetic slots P changes... The value will also change accordingly. Since the second axis of symmetry is also the axis of symmetry of the spindle-shaped hole, the tilt angle of the connecting section relative to the second axis of symmetry can be obtained. This setting facilitates the smooth flow of magnetic lines of force.

[0021] The apex of the tip section is the point closest to the outer edge of the spindle-shaped hole in the rotor lamination. The radius of the apex of the tip section within the rotor lamination... The range of values ​​is set to This design not only provides sufficient space at the edge of the silicon steel pole to create magnetic isolation grooves, but also facilitates the smooth flow of magnetic lines of force on the rotor laminations.

[0022] The radius of the point on the third arc segment closest to the center of the rotor lamination within the rotor lamination. The range of values ​​is set to This design ensures sufficient thickness between the arc-shaped weight-reducing hole and the motor shaft of the rotor lamination, guaranteeing the strength of the rotor lamination, while also facilitating further weight reduction of the rotor lamination.

[0023] Preferably, a weight-reducing and magnetic isolation hole is provided between the arc-shaped weight-reducing hole and the spindle-shaped hole.

[0024] In this design, by setting a weight-reducing and magnetic-isolating hole between the arc-shaped weight-reducing hole and the spindle-shaped hole, the magnetic lines of force on the outer side of the rotor lamination can be blocked from being conducted in a straight line along the area between the arc-shaped weight-reducing hole and the spindle-shaped hole to the center of the rotor lamination, thus achieving a magnetic isolation effect and preventing magnetic leakage. In addition, the weight-reducing and magnetic-isolating hole can also reduce the weight of the rotor lamination.

[0025] Preferably, two weight-reducing and magnetic isolation holes are provided between the arc-shaped weight-reducing hole and the spindle-shaped hole, and the two weight-reducing and magnetic isolation holes are respectively located on both sides of the arc-shaped weight-reducing hole along the radial direction of the rotor lamination.

[0026] In this scheme, the above-mentioned structural setup can optimize the direction of magnetic field lines and balance their distribution.

[0027] Preferably, both of the weight-reducing and magnetic isolation holes are circular holes, and the two circular holes are divided into a first circular hole and a second circular hole, with the second circular hole located between the center of the first circular hole and the center of the rotor lamination.

[0028] In this design, the weight-reducing and magnetic isolation hole is a round hole, which is convenient for manufacturing and can also better smooth the magnetic lines of force.

[0029] Preferably, the angle β between the line connecting the center of the first circular hole and the center of the rotor lamination and the first axis of symmetry is [value missing]. ,

[0030] The angle θ between the line connecting the center of the second circular hole and the center of the rotor lamination and the first axis of symmetry is [value missing]. ,

[0031] The radius of the center of the first circular hole in the rotor lamination The range of values ​​is ,

[0032] The radius of the center of the second circular hole in the rotor lamination The range of values ​​is ,

[0033] in, Let be the angle between the second axis of symmetry and the first axis of symmetry, and P be the number of magnetic slots. The radius of the rotor lamination is denoted as .

[0034] In this solution, by adopting the above-mentioned structural configuration, the radii of the first and second circular holes can be associated with the radius of the rotor lamination. At the same time, the center of the first and second circular holes can be associated with the number of magnetic slots of the rotor lamination through the first axis of symmetry. This facilitates the quick and accurate positioning and processing of the first and second circular holes, and avoids magnetic leakage caused by inaccurate processing position of the magnetic isolation holes due to weight reduction.

[0035] A unipolar motor, the unipolar motor comprising the rotor laminations of a unipolar motor as described above.

[0036] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of this utility model.

[0037] The positive and progressive effects of this invention are as follows: By configuring the central angle of the arc-shaped weight-reducing hole on the rotor lamination to be the same as the central angle of the magnet slot on the rotor lamination, the transmission path of the magnetic lines of force from the permanent magnet to the motor shaft at the center of the rotor lamination can be blocked, reducing magnetic leakage, torque fluctuation, and vibration noise. The arc-shaped weight-reducing hole can also guide the magnetic lines of force to be smoothly transmitted from the permanent magnet pole to the silicon steel pole, avoiding local magnetic saturation; the arc-shaped weight-reducing hole can also reduce the weight of the rotor lamination, thereby reducing the overall weight and cost of the motor. Especially in high-power motors, reducing rotor inertia can significantly improve the response speed and energy efficiency of the control system; the arc-shaped weight-reducing hole can also balance the weight of the rotor lamination, enhancing the motor's operational stability; the arc-shaped weight-reducing hole also increases the surface area of ​​the rotor lamination, promoting heat transfer, enhancing the motor's heat dissipation performance, and ensuring stable operation of the motor over a long period of time. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the rotor lamination of a unipolar motor according to a preferred embodiment of the present invention.

[0039] Figure 2 for Figure 1 Schematic diagram of a partial structure of the rotor laminations of a unipolar motor Figure 1 .

[0040] Figure 3 for Figure 1 Schematic diagram of a partial structure of the rotor laminations of a unipolar motor Figure 2 .

[0041] Explanation of reference numerals in the attached figures:

[0042] Magnet trough 1

[0043] Arc-shaped weight reduction hole 2

[0044] First arc segment 21

[0045] Second arc segment 22

[0046] Spindle-shaped hole 3

[0047] Tip segment 31

[0048] Connecting segment 32

[0049] Third arc segment 33

[0050] Weight reduction and magnetic shielding hole 4

[0051] First round hole 41

[0052] Second round hole 42

[0053] Silicon steel electrode 100

[0054] Permanent magnet pole 200

[0055] First axis of symmetry 300

[0056] Second axis of symmetry 400 Detailed Implementation

[0057] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.

[0058] like Figures 1-3As shown, this embodiment discloses a rotor lamination for a unipolar motor. The end face of the rotor lamination has at least two circumferentially spaced magnetic slots 1. These slots are used to mount permanent magnets, forming alternating silicon steel poles 100 and permanent magnet poles 200 on the outer circumferential surface of the rotor lamination. Each permanent magnet pole 200 corresponds one-to-one with a magnetic slot 1, and the silicon steel pole 100 is located between adjacent permanent magnet poles 200. In optional embodiments, the number of magnetic slots 1 can be any value of two or more, depending on the user's selection. This embodiment uses five magnetic slots as an example. The end face of the rotor lamination also has arc-shaped weight-reducing holes 2 extending along the circumferential direction of the rotor lamination. The arc-shaped weight-reducing holes 2 are located inside the magnetic slots 1 and are arranged one-to-one with each magnetic slot 1. The central angle of the arc-shaped weight-reducing hole 2 on the rotor lamination is the same as the central angle of the magnetic slot 1 on the rotor lamination. By configuring the central angle of the arc-shaped weight-reducing hole 2 on the rotor lamination to be the same as the central angle of the magnet slot 1 on the rotor lamination, the transmission path of the magnetic lines of force from the permanent magnet to the motor shaft at the center of the rotor lamination can be blocked, reducing magnetic leakage, torque fluctuation, and vibration noise. The arc-shaped weight-reducing hole 2 can also guide the magnetic lines of force to be smoothly transmitted from the permanent magnet pole 200 to the silicon steel pole 100, avoiding local magnetic saturation; the arc-shaped weight-reducing hole 2 can also reduce the weight of the rotor lamination, thereby reducing the overall weight and cost of the motor. Especially in high-power motors, reducing rotor inertia can significantly improve the response speed and energy efficiency of the control system; the arc-shaped weight-reducing hole 2 can also balance the weight of the rotor lamination, enhancing the operating stability of the motor; the arc-shaped weight-reducing hole 2 also increases the surface area of ​​the rotor lamination, promoting heat transfer, enhancing the heat dissipation performance of the motor, and ensuring the stable operation of the motor for a long time.

[0059] like Figure 1 and Figure 2 As shown, the permanent magnet pole 200 has a first axis of symmetry 300 passing through the center of the rotor lamination. The arc-shaped weight reduction hole 2 is symmetrical with respect to the first axis of symmetry 300, which improves the symmetry of the magnetic flux density distribution of the adjacent silicon steel pole 100, so that the magnetic reluctance characteristics of the silicon steel pole 100 and the permanent magnet pole 200 are matched, and the uniformity is improved.

[0060] like Figure 1 and Figure 3 As shown, the arc-shaped weight-reducing hole 2 includes a first arc segment 21 and a second arc segment 22. The centers of both the first arc segment 21 and the second arc segment 22 coincide with the center of the rotor lamination. The first arc segment 21 and the second arc segment 22 form the arc-shaped weight-reducing hole 2, which facilitates the processing and fabrication of the arc-shaped weight-reducing hole 2. The radius of the first arc segment 21 is... The range of values ​​is The radius of the second arc segment 22 The range of values ​​is ,in, The radius of the rotor lamination allows the size of the arc-shaped weight-reducing hole 2 to be correlated with the radius of the rotor lamination, so that the size of the arc-shaped weight-reducing hole 2 changes with the radius of the rotor lamination. Furthermore, the radius of the first arc segment 21... The radius of the second circular arc segment 22 The value can be directly obtained to determine the width variation range of the arc-shaped weight reduction hole 2. If the width of the arc-shaped weight reduction hole 2 is set too large, it will reduce the strength of the rotor lamination. If the width of the arc-shaped weight reduction hole 2 is set too small, it will be difficult to guide the direction of the magnetic lines of force and reduce the weight of the rotor lamination.

[0061] like Figure 1 As shown, the end face of the rotor lamination also has a spindle-shaped hole 3, which is disposed between adjacent arc-shaped weight-reducing holes 2 and extends along the radial direction of the rotor lamination. The spindle-shaped hole 3 is used to reduce the weight of the rotor lamination and also to block the path of magnetic lines of force from the area between adjacent arc-shaped weight-reducing holes 2 to the drive shaft of the rotor lamination, thus preventing magnetic leakage.

[0062] like Figure 1 As shown, the silicon steel pole 100 has a second axis of symmetry 400 passing through the center of the rotor lamination. The spindle-shaped hole 3 is symmetrical with respect to the second axis of symmetry 400, which facilitates the guidance of the magnetic lines of force on both sides of the spindle-shaped hole 3, so that the magnetic lines of force flow smoothly and the magnetic flux density is evenly distributed.

[0063] like Figure 1 and Figure 2 As shown, the spindle-shaped hole 3 includes a pointed section 31, two connecting sections 32, and a third arc section 33. The two ends of the two connecting sections 32 are connected to the pointed section 31 and the third arc section 33, respectively. The pointed section 31 is close to the outer side of the rotor lamination, and the third arc section 33 is close to the center of the rotor lamination. Orienting the pointed section 31 of the spindle-shaped hole 3 towards the outer side of the rotor lamination allows the magnetic lines of force to flow smoothly, increases the sinusoidal nature of the air gap magnetic field, reduces torque fluctuations, and achieves the purpose of reducing vibration and noise. Setting the third arc section 33 of the spindle-shaped hole 3 towards the center of the rotor lamination increases the surface area of ​​the rotor lamination, improves heat dissipation efficiency, and at the same time, this setting facilitates the processing and manufacturing of the spindle-shaped hole 3 without reducing the strength of the rotor lamination.

[0064] like Figure 2 As shown, the angle between connecting segment 32 and the second axis of symmetry 400 The value is The radius of the apex of the tip segment 31 in the rotor lamination The range of values ​​is The radius of the point on the third arc segment 33 closest to the center of the rotor lamination within the rotor lamination. The range of values ​​is Where P is the number of magnet slots 1. Since P is the number of magnet slots 1, the angle between the connecting segment 32 and the second axis of symmetry 400 is... The value is set to Therefore, the angle between the connecting segment 32 and the second axis of symmetry 400 is related to the number of magnet slots 1. If the number P of magnet slots 1 changes... The value will also change accordingly. Since the second axis of symmetry 400 is also the axis of symmetry of the spindle-shaped hole 3, the tilt angle of the connecting section 32 relative to the second axis of symmetry 400 can be obtained. This setting facilitates the smooth flow of magnetic lines of force.

[0065] like Figure 2 As shown, the vertex of the tip segment 31 is the point closest to the outer side of the spindle-shaped hole 3 on the rotor lamination. The radius of the vertex of the tip segment 31 within the rotor lamination... The range of values ​​is set to This design not only provides sufficient space at the edge of the silicon steel pole 100 to create magnetic isolation grooves, but also facilitates the smooth flow of magnetic lines of force on the rotor laminations.

[0066] like Figure 2 As shown, the radius of the point on the third arc segment 33 closest to the center of the rotor lamination within the rotor lamination... The range of values ​​is set to This design ensures sufficient thickness between the arc-shaped weight-reducing hole 2 and the motor shaft of the rotor lamination, while also facilitating further weight reduction of the rotor lamination and increasing the heat dissipation area.

[0067] like Figures 1-3 As shown, a weight-reducing and magnetic-isolating hole 4 is provided between the arc-shaped weight-reducing hole 2 and the spindle-shaped hole 3. By providing the weight-reducing and magnetic-isolating hole 4 between the arc-shaped weight-reducing hole 2 and the spindle-shaped hole 3, the magnetic lines of force on the outer side of the rotor lamination can be blocked from being conducted in a straight line along the area between the arc-shaped weight-reducing hole 2 and the spindle-shaped hole 3 to the center of the rotor lamination, thus achieving the effect of magnetic isolation and preventing magnetic leakage. In addition, the weight-reducing and magnetic-isolating hole 4 can improve the heat dissipation effect and also reduce the weight of the rotor lamination.

[0068] Two weight-reducing and magnetic isolation holes 4 are provided between the arc-shaped weight-reducing hole 2 and the spindle-shaped hole 3. The two weight-reducing and magnetic isolation holes 4 are located on both sides of the arc-shaped weight-reducing hole 2 along the radial direction of the rotor lamination, which can optimize the direction of the magnetic lines of force and balance the distribution of the magnetic lines of force.

[0069] In this embodiment, in order to facilitate the processing and manufacturing of the weight-reducing magnetic isolation holes 4, both weight-reducing magnetic isolation holes 4 are round holes. At the same time, setting the weight-reducing magnetic isolation holes 4 as round holes can also better achieve the effect of smoothing magnetic lines of force.

[0070] like Figure 2As shown, specifically, the two circular holes are a first circular hole 41 and a second circular hole 42. The second circular hole 42 is located between the center of the first circular hole 41 and the center of the rotor lamination. The angle β between the line connecting the center of the first circular hole 41 and the center of the rotor lamination and the first axis of symmetry 300 is [value missing]. The angle θ between the line connecting the center of the second circular hole 42 and the center of the rotor lamination and the first axis of symmetry 300 is... The radius of the center of the first circular hole 41 in the rotor lamination The range of values ​​is The radius of the center of the second circular hole 42 in the rotor lamination The range of values ​​is ,in, The angle between the second axis of symmetry 400 and the first axis of symmetry 300 is defined. The radii of the first circular hole 41 and the second circular hole 42 are associated with the radius of the rotor lamination. At the same time, the center of the first circular hole 41 and the center of the second circular hole 42 are associated with the number of magnetic slots 1 of the rotor lamination through the first axis of symmetry 300. This facilitates the quick and accurate positioning and processing of the first circular hole 41 and the second circular hole 42, and avoids magnetic leakage due to inaccurate processing position of the magnetic isolation hole 4 for weight reduction.

[0071] This embodiment also discloses a unipolar motor, which includes the rotor laminations of the unipolar motor as described above.

[0072] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A rotor lamination for a unipolar electric motor, characterized in that, The end face of the rotor lamination is provided with at least two magnet slots spaced apart circumferentially. The end face of the rotor lamination also has an arc-shaped weight reduction hole extending along the circumferential direction of the rotor lamination. The arc-shaped weight reduction hole is located inside the magnet slot and is provided in a one-to-one correspondence with the magnet slot. The central angle of the arc-shaped weight reduction hole on the rotor lamination is the same as the central angle of the magnet slot on the rotor lamination.

2. The rotor lamination of the unipolar motor as described in claim 1, characterized in that, The magnetic slots are used to install permanent magnets to form alternating silicon steel poles and permanent magnet poles on the outer circumferential surface of the rotor laminations. The permanent magnet poles correspond one-to-one with the magnetic slots. The silicon steel poles are located between adjacent permanent magnet poles. The permanent magnet poles have a first axis of symmetry passing through the center of the rotor laminations. The arc-shaped weight-reducing holes are symmetrical with respect to the first axis of symmetry.

3. The rotor lamination of the unipolar motor as described in claim 2, characterized in that, The arc-shaped weight-reducing hole includes a first arc segment and a second arc segment. The centers of both the first and second arc segments coincide with the center of the rotor lamination. The first and second arc segments form the arc-shaped weight-reducing hole. The radius of the first arc segment is... The range of values ​​is The radius of the second arc segment The range of values ​​is ,in, The radius of the rotor lamination is denoted as .

4. The rotor lamination of the unipolar motor as described in claim 2, characterized in that, The end face of the rotor lamination also has a spindle-shaped hole, which is disposed between adjacent arc-shaped weight-reducing holes and extends along the radial direction of the rotor lamination.

5. The rotor lamination of the unipolar motor as described in claim 4, characterized in that, The silicon steel pole has a second axis of symmetry passing through the center of the rotor lamination, and the spindle-shaped hole is symmetrical with respect to the second axis of symmetry.

6. The rotor lamination of the unipolar motor as described in claim 5, characterized in that, The spindle-shaped hole includes a pointed section, two connecting sections and a third arc section. The two ends of the two connecting sections are respectively connected to the pointed section and the third arc section. The pointed section is close to the outer side of the rotor lamination, and the third arc section is close to the center of the rotor lamination.

7. The rotor lamination of the unipolar motor as described in claim 6, characterized in that, The angle between the connecting segment and the second axis of symmetry The value is The radius of the apex of the tip segment in the rotor lamination The range of values ​​is , The radius of the point on the third arc segment closest to the center of the rotor lamination within the rotor lamination. The range of values ​​is , Where P is the number of magnetic slots. The radius of the rotor lamination is denoted as .

8. The rotor lamination of the unipolar motor as described in claim 4, characterized in that, A weight-reducing and magnetic isolation hole is provided between the arc-shaped weight-reducing hole and the spindle-shaped hole.

9. The rotor lamination of the unipolar motor as described in claim 8, characterized in that, Two weight-reducing and magnetic isolation holes are provided between the arc-shaped weight-reducing hole and the spindle-shaped hole, and the two weight-reducing and magnetic isolation holes are respectively located on both sides of the arc-shaped weight-reducing hole along the radial direction of the rotor lamination.

10. The rotor lamination of the unipolar motor as described in claim 9, characterized in that, Both of the weight-reducing and magnetic isolation holes are circular holes, and the two circular holes are divided into a first circular hole and a second circular hole. The second circular hole is located between the center of the first circular hole and the center of the rotor lamination.

11. The rotor lamination of the unipolar motor as described in claim 10, characterized in that, The angle β between the line connecting the center of the first circular hole and the center of the rotor lamination and the first axis of symmetry is [value missing]. , The angle θ between the line connecting the center of the second circular hole and the center of the rotor lamination and the first axis of symmetry is [value missing]. , The radius of the center of the first circular hole in the rotor lamination The range of values ​​is , The radius of the center of the second circular hole in the rotor lamination The range of values ​​is , in, Let be the angle between the second axis of symmetry and the first axis of symmetry, and P be the number of magnetic slots. The radius of the rotor lamination is denoted as .

12. A unipolar motor, characterized in that, The unipolar motor includes the rotor laminations of the unipolar motor as described in any one of claims 1-11.

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