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

Abstract

This utility model discloses a rotor lamination for a unipolar motor and the unipolar motor itself. The rotor lamination has at least two circumferentially spaced magnetic slots on its end face. The outer circumferential surface of the rotor lamination has a groove. Each magnetic slot has a groove at both ends, which are respectively the entry end and the exit end. The groove near the entry end is the first groove, and the groove near the exit end is the second groove. The width of the first groove and the second groove along the circumferential direction of the rotor lamination and / or the depth along the radial direction of the rotor lamination are different. By setting the width and / or depth of the first groove and the second groove to be different, the width of the permanent magnet pole face towards the air gap can be adjusted, thereby reducing the leakage magnetic flux at both ends of the permanent magnet pole. It also makes the magnetic flux density of adjacent magnetic poles more symmetrical, and can reduce the odd and even harmonics in the air gap magnetic flux density, thereby reducing the back EMF harmonic content and reducing torque ripple.

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, alternating pole motors can reduce the number of magnets by half, but this also leads to a decrease in torque and an increase in vibration and noise. Therefore, how to reduce the vibration and noise caused by torque fluctuations in unipolar motors is a key focus for R&D designers. 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 magnetic slots are spaced apart circumferentially on the end face of the rotor lamination, and a groove is provided on the outer circumferential surface of the rotor lamination. Each magnetic slot has a groove at both ends, and the two ends of the magnetic slot are an inlet end and an outlet end, respectively. The groove near the inlet end is a first groove, and the groove near the outlet end is a second groove. The width of the first groove and the second groove along the circumferential direction of the rotor lamination and / or the depth along the radial direction of the rotor lamination are different.

[0006] In this scheme, since one permanent magnet is installed on an adjacent magnetic pole of the unipolar motor and the other is not, alternating permanent magnet poles and silicon steel poles are formed on the outer circumference of the rotor lamination. The permanent magnets have a constraining effect on the magnetic lines of force, resulting in an asymmetrical magnetic flux density distribution between adjacent magnetic poles. Furthermore, since the rotor laminations have a rotational direction, the permanent magnets have an entry end and an exit end. Due to the influence of armature reaction and changes in magnetic permeability, when the rotor laminations rotate, they will affect the magnetic flux density at the entry end and the exit end of the permanent magnets. Therefore, by setting the width and / or depth of the first and second grooves to be different, the width of the permanent magnet pole facing the air gap can be adjusted, thereby reducing the leakage magnetic flux at both ends of the permanent magnet poles. This also makes the magnetic flux density of adjacent magnetic poles more symmetrical, and can reduce the odd and even harmonics in the air gap magnetic flux density, thereby reducing the back EMF harmonic content and reducing torque fluctuations.

[0007] Preferably, the width of the first groove along the circumferential direction of the rotor lamination is smaller than the width of the second groove along the circumferential direction of the rotor lamination.

[0008] In this scheme, the width of the first groove at the entry end is set to be smaller than the width of the second groove at the exit end. This can balance the magnetic flux density effect caused by the rotation of the rotor laminations, make the magnetic flux density of adjacent magnetic poles more uniform and symmetrical, balance the force on the rotor, avoid torque fluctuations caused by rapid changes in magnetic permeability, and reduce unilateral magnetic pull.

[0009] Preferably, the cross-sections of the first groove and the second groove along the axis perpendicular to the rotor lamination are both formed by multiple line segments, and the number of line segments in the first groove is less than the number of line segments in the second groove.

[0010] In this design, grooves formed by multiple line segments are created by cutting the air gap surface at different positions of the rotor laminations. The position of each line segment corresponds to the peak position of different harmonics before cutting, thereby suppressing harmonic amplitude, increasing the sinusoidal nature of the air gap magnetic field, and reducing vibration noise. Since the first groove is located on one side of the inlet end and the second groove is located on one side of the outlet end, configuring the number of line segments in the first groove to be less than the number of line segments in the second groove can eliminate the influence of the rotor laminations on the magnetic flux density during rotation, making the magnetic flux density of adjacent magnetic poles more symmetrical. It can also reduce the odd and even harmonics in the air gap magnetic flux density, thereby reducing the back EMF harmonic content and reducing torque ripple.

[0011] Preferably, the first groove includes a first connection point, a second connection point, a third connection point, and a fourth connection point. The first connection point, the second connection point, the third connection point, and the fourth connection point are connected sequentially to form the first groove surrounded by three line segments. The central angle corresponding to the line segment in the middle of the first groove is greater than the central angle corresponding to the line segment at any end of the first groove.

[0012] In this scheme, since the first groove is close to the entry end, the rotor lamination has little impact on the magnetic flux density at the entry end when it rotates. Therefore, the first groove is formed by three line segments, and the central angle corresponding to the middle line segment is larger than the central angle corresponding to any line segment at both ends, which can significantly reduce the amplitude of the third, fifth and seventh harmonics in the back EMF.

[0013] Preferably, the magnet slot has an axis of symmetry passing through the rotor lamination, and the first connection point is the starting point of the first groove.

[0014] The range of the angle between the line connecting the first connection point and the center of the rotor lamination and the axis of symmetry is as follows: , where P is the number of magnet slots in the rotor laminations.

[0015] In this scheme, the range of the angle between the line connecting the first connection point and the center of the rotor lamination and the axis of symmetry is set to... The starting position of the first groove is correlated with the number of magnet slots in the rotor laminations. As the number of magnet slots changes, the starting position changes accordingly. Of course, the starting position can be adjusted within a preset parameter range, which can also achieve the effect of reducing harmonic amplitude.

[0016] Preferably, the second connection point and the third connection point are both located at the same depth in the first groove;

[0017] And / or, the depth of the first groove is 0.5 mm.

[0018] In this scheme, the second connection point and the third connection point are both located at the same depth of the first groove, so that the first groove can be symmetrical with respect to the axis passing through the center of the rotor lamination, improving the symmetry of the magnetic flux density distribution of adjacent silicon steel poles, matching the magnetic reluctance characteristics of the silicon steel poles and permanent magnet poles, and improving uniformity.

[0019] Preferably, the magnet slot has an axis of symmetry passing through the rotor lamination, and the second groove includes a fifth, sixth, seventh, eighth, ninth, and tenth connection point connected in sequence. These five connection points are connected to form the second groove enclosed by five line segments, with the fifth connection point being the starting point of the second groove.

[0020] The angle between the line connecting the fifth connection point and the center of the rotor lamination and the axis of symmetry ranges from [value missing]. ,

[0021] in, The value is P represents the number of magnet slots in the rotor laminations, and Z represents the number of stator teeth that cooperate with the rotor laminations. The greatest common divisor of 2P and Z is... It is the least common multiple of 2P and Z.

[0022] In this scheme, since the second groove is close to the exit end, the rotor lamination has a significant impact on the magnetic flux density at the exit end when it rotates. Therefore, a second groove formed by five line segments is used to suppress the harmonic amplitude, increase the sinusoidal nature of the air gap magnetic field, and achieve the purpose of reducing vibration noise.

[0023] The range of values ​​for the angle between the line connecting the fifth connection point and the center of the rotor lamination and the axis of symmetry is set as follows: This establishes a correlation between the starting position of the second groove and the number of magnet slots in the rotor laminations and the number of teeth in the stator. If the number of magnet slots and the number of teeth in the stator change, the starting position will change. Of course, the starting position can be adjusted within a preset parameter range, which can also achieve the effect of reducing harmonic amplitude.

[0024] in, The greatest common divisor of 2P and Z is... It is the least common multiple of 2P and Z. Of course, the starting position can be adjusted within the preset parameter range, which can also achieve the effect of reducing the harmonic amplitude.

[0025] Preferably, the angle between the line connecting the sixth connection point and the center of the rotor lamination and the axis of symmetry ranges from [value missing]. ,

[0026] The angle between the line connecting the seventh connection point and the center of the rotor lamination and the axis of symmetry ranges from [value missing]. ,

[0027] The angle between the line connecting the eighth connection point and the center of the rotor lamination and the axis of symmetry. The range of values ​​is ,

[0028] The angle between the line connecting the ninth connection point and the center of the rotor lamination and the axis of symmetry ranges from [value missing]. ,

[0029] The angle between the line connecting the tenth connection point and the center of the rotor lamination and the axis of symmetry ranges from [value missing]. .

[0030] In this solution, by adopting the above-mentioned structural setup, the precise range and length of each line segment can be obtained, so as to facilitate the processing of a second groove with accurate dimensions.

[0031] Preferably, the sixth connection point and the seventh connection point are both located at the same depth in the second groove;

[0032] And / or, the eighth connection point and the ninth connection point are both located at the same depth in the second groove.

[0033] In this scheme, the sixth and seventh connection points are both located at the same depth in the second groove, and the eighth and ninth connection points are both located at the same depth in the second groove. This improves the symmetry of the magnetic flux density distribution of adjacent silicon steel poles, matches the magnetoresistance characteristics of the silicon steel poles and permanent magnet poles, and improves uniformity.

[0034] A unipolar motor, the unipolar motor comprising the rotor laminations of a unipolar motor as described above.

[0035] 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.

[0036] The positive and progressive effects of this invention are as follows: Since one permanent magnet is installed on an adjacent magnetic pole of a unipolar motor and the other is not, alternating permanent magnet poles and silicon steel poles are formed on the outer circumferential surface of the rotor lamination. The permanent magnets have a constraining effect on the magnetic lines of force, resulting in an asymmetrical magnetic flux density distribution between adjacent magnetic poles. Furthermore, since the rotor laminations have a rotational direction, the permanent magnets have an entry end and an exit end. Due to the influence of armature reaction and changes in magnetic permeability, the rotation of the rotor laminations will affect the magnetic flux density at the entry end and the exit end of the permanent magnets. Therefore, by setting the width and / or depth of the first and second grooves to be different, the width of the permanent magnet pole facing the air gap can be adjusted, thereby reducing the leakage magnetic flux at both ends of the permanent magnet poles. It also makes the magnetic flux density of adjacent magnetic poles more symmetrical, and can reduce the odd and even harmonics in the air gap magnetic flux density, thereby reducing the back EMF harmonic content and reducing torque fluctuations. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the rotor lamination of a unipolar motor according to a preferred embodiment of the present invention.

[0038] Figure 2 for Figure 1 A partial structural diagram of the rotor laminations of a unipolar motor.

[0039] Figure 3 for Figure 2 Enlarged view of section A.

[0040] Explanation of reference numerals in the attached figures:

[0041] Magnetic trough 1, inlet end 11, outlet end 12

[0042] Axis of symmetry 2

[0043] First groove 31, first connecting point 311, second connecting point 312, third connecting point 313, fourth connecting point 314

[0044] The second groove 32, the fifth connection point 321, the sixth connection point 322, the seventh connection point 323, the eighth connection point 324, the ninth connection point 325, and the tenth connection point 326.

[0045] Silicon steel electrode 100

[0046] Permanent magnet pole 200 Detailed Implementation

[0047] 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.

[0048] like Figures 1-3 As 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 1 are used to mount permanent magnets, forming alternating permanent magnet poles 200 and silicon steel poles 100 on the outer circumferential surface of the rotor lamination. This embodiment uses five magnetic slots 1 as an example to illustrate the rotor lamination. Of course, in other embodiments, the number of magnetic slots in the rotor lamination can be set to any one of two or more as needed.

[0049] like Figure 1 As shown, the outer circumferential surface of the rotor lamination has grooves, and each magnet slot 1 has grooves at both ends, with the two ends of the magnet slot 1 being an entry end 11 and an exit end 12, respectively. In this embodiment, the rotor lamination rotates quasi-clockwise; therefore, the front end of each magnet slot 1 is the entry end 11, and the rear end of the magnet slot 1 is the exit end 12. In an optional embodiment, if the rotor lamination rotates clockwise, the rear end of the magnet slot is the entry end, and the front end of the magnet slot is the exit end.

[0050] like Figure 1 As shown, the groove near the inlet end 11 is the first groove 31, and the groove near the outlet end 12 is the second groove 32. The width of the first groove 31 and the second groove 32 along the circumferential direction of the rotor lamination and / or the depth along the radial direction of the rotor lamination are different. Since a unipolar motor has one permanent magnet installed on one of its adjacent magnetic poles and the other on the other, the permanent magnet will constrain the magnetic lines of force, resulting in an asymmetrical magnetic flux density distribution between adjacent poles. Furthermore, due to the rotational direction of the rotor laminations, the permanent magnet has an entry end 11 and an exit end 12. Simultaneously, due to the influence of armature reaction and changes in magnetic permeability, the rotation of the rotor laminations will affect the magnetic flux density at the entry end 11 and the exit end 12 of the permanent magnet. Therefore, by setting the width and / or depth of the first groove 31 and the second groove 32 to be different, the width of the permanent magnet pole 200 facing the air gap can be adjusted, thereby reducing the leakage magnetic flux at both ends of the permanent magnet pole 200. It will also make the magnetic flux density of adjacent poles more symmetrical, and can also reduce the odd and even harmonics in the air gap magnetic flux density, thereby reducing the back EMF harmonic content and reducing torque fluctuation.

[0051] like Figures 1-3As shown, the width of the first groove 31 along the circumferential direction of the rotor lamination is smaller than the width of the second groove 32 along the circumferential direction of the rotor lamination. Setting the width of the first groove 31 located at the entry end 11 to be smaller than the width of the second groove 32 located at the exit end 12 can balance the magnetic flux density effect caused by the rotation of the rotor lamination, making the magnetic flux density of adjacent magnetic poles more uniform and symmetrical, balancing the force on the rotor, avoiding torque fluctuations caused by abrupt changes in magnetic permeability, and reducing unilateral magnetic pull.

[0052] like Figure 3 As shown, the first groove 31 and the second groove 32 are both formed by multiple line segments along the cross-section perpendicular to the axis of the rotor lamination. The number of line segments in the first groove 31 is less than the number of line segments in the second groove 32. By cutting the air gap surface at different positions of the rotor lamination, grooves formed by multiple line segments are created. The position of each line segment corresponds to the peak position of different harmonics before cutting, thereby suppressing the harmonic amplitude, increasing the sinusoidal nature of the air gap magnetic field, and reducing vibration noise. Since the first groove 31 is located on one side of the inlet end 11 and the second groove 32 is located on one side of the outlet end 12, configuring the number of line segments in the first groove 31 to be less than the number of line segments in the second groove 32 can eliminate the influence of the rotor lamination on the magnetic flux density during rotation, making the magnetic flux density of adjacent magnetic poles more symmetrical. It can also reduce the odd and even harmonics in the air gap magnetic flux density, thereby reducing the back EMF harmonic content and reducing torque fluctuations.

[0053] like Figure 3 As shown, the first groove 31 includes a first connection point 311, a second connection point 312, a third connection point 313, and a fourth connection point 314. The first connection point 311, the second connection point 312, the third connection point 313, and the fourth connection point 314 are connected sequentially to form a first groove 31 surrounded by three line segments. The central angle corresponding to the line segment in the middle of the first groove 31 is larger than the central angle corresponding to the line segment at any end of the first groove 31. Since the first groove 31 is close to the inlet end 11, the rotor lamination has a smaller impact on the magnetic flux density of the inlet end 11 when it rotates. Therefore, by using a first groove 31 surrounded by three line segments, and making the central angle corresponding to the line segment in the middle larger than the central angle corresponding to the line segment at either end, the amplitude of the third, fifth, and seventh harmonics in the back EMF can be significantly reduced.

[0054] like Figures 1-3 As shown, the magnet slot 1 has a symmetry axis 2 passing through the rotor lamination. The first connection point 311 is the starting point of the first groove 31. The angle between the line connecting the first connection point 311 and the center of the rotor lamination and the symmetry axis 2 ranges from [value missing]. Where P is the number of magnet slots 1 in the rotor lamination. The range of the angle between the line connecting the first connection point 311 and the center of the rotor lamination and the axis of symmetry 2 is set to... The starting position of the first groove 31 can be correlated with the number of magnet slots 1 in the rotor lamination. If the number of magnet slots 1 changes, the starting position will change. Of course, the starting position can be adjusted within a preset parameter range, which can also achieve the effect of reducing harmonic amplitude.

[0055] The angle between the line connecting the second connection point 312 and the center of the rotor lamination and the axis of symmetry 2 ranges from [value missing]. The range of the angle between the line connecting the third connection point 313 and the center of the rotor lamination and the axis of symmetry 2 is as follows: The range of the angle between the line connecting the fourth connection point 314 and the center of the rotor lamination and the axis of symmetry 2 is as follows: .in, The value is P is the number of magnet slots 1 in the rotor laminations, and Z is the number of teeth in the stator that cooperate with the rotor laminations. The greatest common divisor of 2P and Z is... It is the least common multiple of 2P and Z. For example, for a 10-slot, 12-pole motor, P=5, Z=12, then The greatest common divisor is 2. The least common multiple is 60.

[0056] Of course, the starting position of the first groove can be adjusted within the preset parameter range to achieve a better effect of reducing harmonic amplitude.

[0057] Preferably, the second connection point 312 and the third connection point 313 are both located at the same depth of the first groove 31, so that the first groove 31 can be symmetrical with respect to the axis passing through the center of the rotor lamination, thereby improving the symmetry of the magnetic flux density distribution of adjacent silicon steel poles 100, matching the magnetoresistive characteristics of the silicon steel poles 100 and the permanent magnet poles 200, and improving uniformity.

[0058] Preferably, the depth of the first groove 31 is 0.5 mm.

[0059] like Figures 1-3 As shown, the second groove 32 includes a fifth connection point 321, a sixth connection point 322, a seventh connection point 323, an eighth connection point 324, a ninth connection point 325, and a tenth connection point 326 connected in sequence. These five connection points form a second groove 32 enclosed by five line segments. The fifth connection point 321 is the starting point of the second groove 32. The angle between the line connecting the fifth connection point 321 and the center of the rotor lamination and the axis of symmetry 2 ranges from [value missing]. Because the second groove 32 is close to the exit end 12, it has a significant impact on the magnetic flux density of the exit end 12 when the rotor lamination rotates. Therefore, a second groove 32 formed by five line segments is used to suppress harmonic amplitude, increase the sinusoidal nature of the air gap magnetic field, and reduce vibration noise. The angle between the line connecting the fifth connection point 321 and the center of the rotor lamination and the axis of symmetry 2 is set to a range of values. This establishes a correlation between the starting position of the second groove 32 and the number of magnet slots 1 in the rotor laminations and the number of teeth in the stator. If the number of magnet slots 1 and the number of teeth in the stator change, the starting position will change. Of course, the starting position can be adjusted within a preset parameter range to achieve a better reduction in harmonic amplitude.

[0060] The angle between the line connecting the sixth connection point 322 and the center of the rotor lamination and the axis of symmetry 2 ranges from [value missing]. The range of the angle between the line connecting the seventh connection point 323 and the center of the rotor lamination and the axis of symmetry 2 is as follows: The angle between the line connecting the eighth connection point 324 and the center of the rotor lamination and the axis of symmetry 2. The range of values ​​is The range of the angle between the line connecting the ninth connection point 325 and the center of the rotor lamination and the axis of symmetry 2 is as follows: The range of the angle between the line connecting the tenth connection point 326 and the center of the rotor lamination and the axis of symmetry 2 is as follows: By using the central angle parameters corresponding to each point and combining them with the depth of each point within the second groove 32, the position of each point can be accurately located, thereby obtaining the precise length of each line segment, so as to process the second groove 32 with accurate dimensions.

[0061] Preferably, the sixth connection point 322 and the seventh connection point 323 are both located at the same depth of the second groove 32, which improves the symmetry of the magnetic flux density distribution of adjacent silicon steel poles 100, makes the magnetic resistance characteristics of silicon steel poles 100 and permanent magnet poles 200 match, and improves uniformity.

[0062] Preferably, the eighth connection point 324 and the ninth connection point 325 are both located at the same depth in the second groove 32, which improves the symmetry of the magnetic flux density distribution of adjacent silicon steel poles 100, makes the magnetic resistance characteristics of silicon steel poles 100 and permanent magnet poles 200 match, and improves uniformity.

[0063] In this embodiment, the width and depth of the first groove 31 are different from the width and depth of the second groove 32, which results in a better effect on reducing torque fluctuations. Of course, in other optional embodiments, the width or depth of the first groove 31 can also be different from the width or depth of the second groove 32, which can also achieve a good effect on reducing torque fluctuations.

[0064] This embodiment also discloses a unipolar motor, which includes the rotor laminations of the unipolar motor as described above.

[0065] 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 rotor lamination has at least two magnetic slots spaced circumferentially on its end face. The outer circumferential surface of the rotor lamination has a groove. Each magnetic slot has a groove at both ends. The two ends of the magnetic slot are an inlet end and an outlet end, respectively. The groove near the inlet end is the first groove, and the groove near the outlet end is the second groove. The width of the first groove and the second groove along the circumferential direction of the rotor lamination and / or the depth along the radial direction of the rotor lamination are different.

2. The rotor lamination of the unipolar motor as described in claim 1, characterized in that, The width of the first groove along the circumferential direction of the rotor lamination is smaller than the width of the second groove along the circumferential direction of the rotor lamination.

3. The rotor lamination of the unipolar motor as described in claim 1 or 2, characterized in that, Both the first groove and the second groove are formed by multiple line segments along the cross section perpendicular to the axis of the rotor lamination, with the first groove having fewer line segments than the second groove.

4. The rotor lamination of the unipolar motor as described in claim 3, characterized in that, The first groove includes a first connection point, a second connection point, a third connection point, and a fourth connection point. The first connection point, the second connection point, the third connection point, and the fourth connection point are connected in sequence to form the first groove surrounded by three line segments. The central angle corresponding to the line segment in the middle of the first groove is greater than the central angle corresponding to the line segment at any end of the first groove.

5. The rotor lamination of the unipolar motor as described in claim 4, characterized in that, The magnet slot has an axis of symmetry passing through the rotor lamination, and the first connection point is the starting point of the first groove. The range of the angle between the line connecting the first connection point and the center of the rotor lamination and the axis of symmetry is as follows: , where P is the number of magnet slots in the rotor laminations.

6. The rotor lamination of the unipolar motor as described in claim 5, characterized in that, The second connection point and the third connection point are both located at the same depth in the first groove; And / or, the depth of the first groove is 0.5 mm.

7. The rotor lamination of the unipolar motor as described in claim 3, characterized in that, The magnet slot has an axis of symmetry passing through the rotor lamination. The second groove includes a fifth, sixth, seventh, eighth, ninth, and tenth connection point connected in sequence. These five connection points are connected to form the second groove enclosed by five line segments. The fifth connection point is the starting point of the second groove. The angle between the line connecting the fifth connection point and the center of the rotor lamination and the axis of symmetry ranges from [value missing]. , in, The value is P represents the number of magnet slots in the rotor laminations, and Z represents the number of teeth in the stator that cooperate with the rotor laminations. The greatest common divisor of 2P and Z is... It is the least common multiple of 2P and Z.

8. The rotor lamination of the unipolar motor as described in claim 7, characterized in that, The angle between the line connecting the sixth connection point and the center of the rotor lamination and the axis of symmetry ranges from [value missing]. , The angle between the line connecting the seventh connection point and the center of the rotor lamination and the axis of symmetry ranges from [value missing]. , The angle between the line connecting the eighth connection point and the center of the rotor lamination and the axis of symmetry. The range of values ​​is , The angle between the line connecting the ninth connection point and the center of the rotor lamination and the axis of symmetry ranges from [value missing]. , The angle between the line connecting the tenth connection point and the center of the rotor lamination and the axis of symmetry ranges from [value missing]. .

9. The rotor lamination of the unipolar motor as described in claim 8, characterized in that, The sixth connection point and the seventh connection point are both located at the same depth in the second groove; And / or, the eighth connection point and the ninth connection point are both located at the same depth in the second groove.

10. A unipolar motor, characterized in that, The unipolar motor includes the rotor laminations of the unipolar motor as described in any one of claims 1-9.

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