Rotor punching sheet structure of permanent magnet synchronous motor

Abstract

The utility model provides a permanent magnet synchronous motor rotor punching sheet structure comprising a punching sheet body which is equally divided into a plurality of magnetic pole areas, and each magnetic pole area is internally provided with a magnetic pole structure; each magnetic pole structure comprises two symmetrically arranged first magnetic steel grooves and a second magnetic steel groove located between the two first magnetic steel grooves; the end, close to the outer edge of the punching sheet body, of each first magnetic steel groove is provided with a first magnetic isolation groove, the two end sides of each second magnetic steel groove are each provided with a second magnetic isolation groove, and the corresponding arc length of the extension lines of the edges, close to each other, of the two first magnetic isolation grooves on the outer edge of the magnetic pole area is L02. The corresponding arc length of the extension lines of the edges, close to each other, of the two second magnetic isolation grooves on the outer edges of the magnetic pole areas is L03, the arc length of the outer edge of one magnetic pole area is L01, the ratio of L02 to L01 is 0.6-0.9, and the ratio of L03 to L01 is 0.2-0.5. The stress intensity of the punching sheet structure is enhanced, and the cost of the motor is prevented from being increased while the requirement of the permanent magnet synchronous motor for high rotating speed is met.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a rotor punching sheet structure of a permanent magnet synchronous motor. Background Art

[0002] With the continuous upgrading of new energy electric vehicle technology, the rotational speed of the permanent magnet synchronous motor developed in the early stage is low (about 10,000 rpm (Revolutions Per Minute)), and the stress intensity of the rotor punching sheet is insufficient to meet the requirements of high rotational speed (about 20,000 rpm). Adding a sheath (carbon fiber, titanium alloy) to the outer circle of the rotor of a traditional super-high speed motor will lead to complex motor technology, low utilization rate of magnetic steel, and a sharp increase in comprehensive cost. Content of the Utility Model

[0003] In view of this, the purpose of the utility model is to provide a rotor punching sheet structure of a permanent magnet synchronous motor to solve the problem of insufficient stress intensity of the rotor punching sheet.

[0004] Based on the above purpose, the utility model provides a rotor punching sheet structure of a permanent magnet synchronous motor, including: a punching sheet body, the punching sheet body is evenly divided into a plurality of pole regions, and a pole structure is arranged in each pole region;

[0005] Each pole structure includes two symmetrically arranged first magnetic steel grooves and a second magnetic steel groove located between the two first magnetic steel grooves; a first magnetic isolation groove is arranged at one end of each first magnetic steel groove close to the outer edge of the punching sheet body, a second magnetic isolation groove is arranged at each end side of the second magnetic steel groove, and the arc length corresponding to the extended lines of the mutually close edges of the two first magnetic isolation grooves on the outer edge of the pole region is L02, the arc length corresponding to the extended lines of the mutually close edges of the two second magnetic isolation grooves on the outer edge of the pole region is L03, the outer edge arc length of a pole region is L01, L02:L01 = 0.6 - 0.9, L03:L01 = 0.2 - 0.5.

[0006] Further, the included angle between the mutually close edges of the two first magnetic isolation grooves is β02, the included angle between the mutually close edges of the two second magnetic isolation grooves is β03, the central angle of a pole region is β01, and β01 = β02 = β03.

[0007] Further, 6 or 8 pole regions are arranged on the punching sheet body, and the included angle β04 between the two first magnetic steel grooves in a pole structure satisfies β04:β01 = 1.5 - 2.5.

[0008] Further, a third magnetic isolation groove is arranged at each end of the second magnetic steel groove, the third magnetic isolation groove is communicated with the second magnetic steel groove and is located between the second magnetic isolation groove and the second magnetic steel groove.

[0009] Further, a fourth magnetic isolation groove is provided at one end of the first magnetic steel groove away from the outer edge of the punching sheet body, and the first magnetic isolation groove and the fourth magnetic isolation groove are communicated with the first magnetic steel groove.

[0010] Further, two chamfers are provided on the side of the first magnetic isolation groove close to the outer edge of the punching sheet body, and among them, the chamfer away from the second magnetic isolation groove is larger.

[0011] Further, two chamfers are provided on the side of the second magnetic isolation groove close to the outer edge of the punching sheet body, and among them, the chamfer close to the first magnetic isolation groove is larger.

[0012] Further, two chamfers are provided on each of the two sides where the second magnetic isolation groove and the third magnetic isolation groove are close to each other. Among them, the chamfer of the second magnetic isolation groove close to the outer edge of the punching sheet body is the first chamfer, and the other chamfer is the second chamfer. The chamfer of the third magnetic isolation groove close to the outer edge of the punching sheet body is the third chamfer, and the other chamfer is the fourth chamfer. The first chamfer > the fourth chamfer > the third chamfer > the second chamfer.

[0013] Further, two chamfers are provided on the edge of the fourth magnetic isolation groove away from the first magnetic steel groove, and among them, the chamfer close to the outer edge of the punching sheet body is larger.

[0014] Further, the punching sheet structure further includes a plurality of weight removal holes uniformly arranged on the punching sheet body. The weight removal holes are located on the demarcation line of the magnetic pole region and are arranged close to the inner edge of the punching sheet body. The weight removal holes are polygonal, and one side is arranged close to the inner edge of the punching sheet body and has the same projection radian as it on the inner edge of the punching sheet body but in the opposite direction.

[0015] As can be seen from the above, a punching sheet structure of a permanent magnet synchronous motor rotor provided by the present invention evenly arranges a plurality of magnetic pole structures on the punching sheet body, symmetrically arranges a first magnetic steel groove and a second magnetic steel groove on each magnetic pole structure, and arranges a first magnetic isolation groove and a second magnetic isolation groove close to the punching sheet body at its end. This not only improves the design rationality of the magnetic pole structure to increase the magnetic resistance torque ratio and the sinusoidality of the back electromotive force of the rotor, thereby improving the strength of the punching sheet structure, but also respectively arranges a first magnetic isolation groove and a second magnetic isolation groove at the ends of the first magnetic steel groove and the second magnetic steel groove, improving the design rationality of the magnetic isolation grooves on the magnetic pole structure to enhance the magnetic steel utilization rate of the punching sheet structure of the rotor. While being able to meet the requirements of high rotational speed of the permanent magnet synchronous motor, it also avoids an increase in the cost of the motor. Description of the Drawings

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0017] Figure 1 It is a schematic structural diagram of the rotor punching sheet structure of the high-speed permanent magnet synchronous motor in the embodiment of the present invention;

[0018] Figure 2 It is a schematic structural diagram of the pole structure in the embodiment of the present invention;

[0019] Figure 3 It is a schematic structural diagram of the first magnetic isolation bridge in the embodiment of the present invention;

[0020] Figure 4 It is a schematic structural diagram of the second magnetic isolation bridge in the embodiment of the present invention;

[0021] Figure 5 It is a schematic structural diagram of the third magnetic isolation bridge in the embodiment of the present invention;

[0022] Figure 6 It is a schematic structural diagram of the fourth magnetic isolation bridge in the embodiment of the present invention;

[0023] Figure 7 It is a schematic structural diagram of the weight removal hole in the embodiment of the present invention.

[0024] In the figure: 1. Punching sheet body; 2. Shaft hole; 3. d-axis; 4. q-axis; 5. Weight removal hole; 6. First magnet slot; 7. Second magnet slot; 8. First magnetic isolation slot; 9. Second magnetic isolation slot; 10. Third magnetic isolation slot; 11. Fourth magnetic isolation slot; 12. First magnetic isolation bridge; 13. Second magnetic isolation bridge; 14. Third magnetic isolation bridge; 15. Fourth magnetic isolation bridge. Specific embodiments

[0025] To make the purpose, technical solutions and advantages of the present invention clearer and more understandable, the following will further describe the present invention in detail with reference to specific embodiments and the accompanying drawings.

[0026] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present utility model should have the ordinary meanings understood by those with general skills in the field to which this application belongs. The "first", "second" and similar terms used in this application do not denote any order, quantity or importance, but are only used to distinguish different components. The terms such as "comprising" or "including" mean that the elements or objects appearing before this term cover the elements or objects listed after this term and their equivalents, without excluding other elements or objects. The terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left" and "right" are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0027] The application of permanent magnet synchronous motors in vehicles is becoming more and more widespread. The advantages of permanent magnet synchronous motors in high performance, high stability, wide speed regulation range, etc. are particularly prominent. However, the requirements for the cost, high power density, high torque density, vibration, noise, motor envelope size, etc. of permanent magnet synchronous motors are getting higher and higher, which are also the difficulties in the design of permanent magnet synchronous motors.

[0028] As described in the background technology, with the continuous upgrading of new energy electric vehicle technology, the rotational speed of the permanent magnet synchronous motors developed in the early stage is low (about 10,000 rpm), and the stress intensity of the rotor punching sheet is insufficient to meet the requirements of high rotational speed (about 20,000 rpm). Adding a sheath (carbon fiber, titanium alloy) to the outer circle of the rotor of traditional ultra-high speed motors will lead to complex motor processes, low utilization rate of permanent magnets, and a sharp increase in comprehensive cost. The pole structure design is unreasonable, resulting in poor sinusoidality of the rotor back electromotive force waveform, large torque ripple, and prominent NVH (Noise, Vibration, Harshness) problems; the motor power density and torque density are low, the volume is large, and the proportion of reluctance torque of the motor is not high; the design of the magnetic isolation bridge is unreasonable, with large magnetic leakage and low utilization rate of permanent magnets, resulting in high motor cost.

[0029] Based on this, the present application proposes a rotor punching sheet structure for a permanent magnet synchronous motor, designing a reasonable pole structure and magnetic isolation grooves, so that it can meet the requirements of high rotational speed of the permanent magnet synchronous motor while avoiding the increase in motor cost.

[0030] Hereinafter, one or more specific embodiments will be used to illustrate the present application in detail.

[0031] The present application provides a rotor punching sheet structure for a permanent magnet synchronous motor, as Figure 1 and Figure 2As shown in the figure, it includes: a punching sheet body 1, the punching sheet body 1 is evenly divided into a plurality of magnetic pole regions, and a magnetic pole structure is provided in each magnetic pole region;

[0032] Each magnetic pole structure includes two symmetrically arranged first magnetic steel grooves 6 and a second magnetic steel groove 7 located between the two first magnetic steel grooves 6; a first magnetic isolation groove 8 is provided at one end of the first magnetic steel groove 6 close to the outer edge of the punching sheet body 1, and a second magnetic isolation groove 9 is provided on each side of the two ends of the second magnetic steel groove 7. The arc length corresponding to the extension line of the mutually approaching edges of the two first magnetic isolation grooves 8 on the outer edge of the magnetic pole region is L02, and the arc length corresponding to the extension line of the mutually approaching edges of the two second magnetic isolation grooves 9 on the outer edge of the magnetic pole region is L03. The outer edge arc length of a magnetic pole region is L01, L02:L01 = 0.6 - 0.9, L03:L01 = 0.2 - 0.5.

[0033] Specifically, the punching sheet body 1 is of a circular structure, and the magnetic pole regions are evenly and symmetrically distributed along the circumference of the punching sheet body 1, that is, each magnetic pole region corresponds to a sector on the punching sheet body 1. A shaft hole 2 coinciding with its center of the circle is provided on the punching sheet body 1, and each magnetic pole region corresponds to a sector structure of the shaft hole 2.

[0034] The two first magnetic steel grooves 6 of the magnetic pole structure are in a V shape, and the mutually approaching ends of the two first magnetic steel grooves 6 are arranged close to the shaft hole 2, and the mutually remote ends of the two first magnetic steel grooves 6 are arranged close to the outer edge of the punching sheet body 1. The second magnetic steel groove 7 is in a straight shape and is located between the two first magnetic steel grooves 6, and its two ends respectively face the ends of the two first magnetic steel grooves 6 close to the outer edge of the punching sheet body 1. The first magnetic steel groove 6 and the second magnetic steel groove 7 are both of rectangular structures.

[0035] In addition, both the first magnetic isolation groove 8 and the second magnetic isolation groove 9 include two parallel sides. The first magnetic isolation groove 8 includes a side close to the outer edge of the punching sheet body 1, and the two sides connected to this side are arranged in parallel. The side of the second magnetic isolation groove 9 close to the outer edge of the punching sheet body 1 is parallel to the outer edge of the punching sheet body 1, and the two sides connected to this side are arranged in parallel. The two mutually approaching sides of the two first magnetic isolation grooves 8 are respectively one of the two parallel sides of the two first magnetic isolation grooves 8. Therefore, the arc length L02 corresponding to the extension line of these two sides on the outer edge of the punching sheet body 1 is less than the outer edge arc length L01 of the corresponding magnetic pole region.

[0036] Two adjacent sides of the two second magnetic isolation grooves 9 are respectively one of the two parallel sides of the two second magnetic isolation grooves 9. Therefore, the arc length L03 corresponding to the extension lines of these two sides on the outer edge of the punching sheet body 1 is less than the arc length L01 of the outer edge of the corresponding magnetic pole region.

[0037] The side of the first magnetic isolation groove 8 close to the outer edge of the punching sheet body 1 and the outer edge of the punching sheet body 1 form a narrow-edge trapezoid. The side of the first magnetic isolation groove 8 close to the outer edge of the punching sheet body 1 is approximately the hypotenuse. The narrow-edge trapezoid shape is to improve the utilization rate of the permanent magnet, and use the magnetic saturation effect to reduce the magnetic leakage of the rotor. Rounding the hypotenuse with different diameters and the trapezoidal hypotenuse both take into account the strength requirements of the magnetic isolation bridge for the rotor magnetic pole structure.

[0038] The side of the second magnetic isolation groove 9 close to the outer edge of the punching sheet body 1 and the outer edge of the punching sheet body 1 form an elongated parallelogram shape. The elongated parallelogram shape is to improve the utilization rate of the permanent magnet, and use the magnetic saturation effect to reduce the magnetic leakage of the rotor. Rounding with different diameters takes into account the strength requirements of the magnetic isolation bridge for the rotor magnetic pole structure.

[0039] L02:L01 = 0.6 - 0.9, L03:L01 = 0.2 - 0.5, which represents the design key points of the parallel sides of the two first magnetic isolation grooves 8 and the two second magnetic isolation grooves 9. This ratio can significantly improve the stress intensity of the rotor punching sheet structure, enabling it to meet the requirements of high rotational speed of the permanent magnet synchronous motor while avoiding an increase in the cost of the motor.

[0040] In this embodiment, by uniformly arranging a plurality of magnetic pole structures on the punching sheet body 1, symmetrically arranging a first permanent magnet groove 6 and a second permanent magnet groove 7 on each magnetic pole structure, and arranging a first magnetic isolation groove 8 and a second magnetic isolation groove 9 close to the punching sheet body 1 at its end, not only is the design rationality of the magnetic pole structure improved to increase the reluctance torque ratio and the sinusoidality of the back electromotive force of the rotor, thereby improving the strength of the punching sheet structure, but also the first magnetic isolation groove 8 and the second magnetic isolation groove 9 are respectively arranged at the end parts of the first permanent magnet groove 6 and the second permanent magnet groove 7, improving the design rationality of the magnetic isolation grooves on the magnetic pole structure to enhance the utilization rate of the permanent magnet of the rotor punching sheet structure, enabling it to meet the requirements of high rotational speed of the permanent magnet synchronous motor while avoiding an increase in the cost of the motor.

[0041] In some embodiments, the included angle between the adjacent edges of the two first magnetic isolation grooves 8 is β02, the included angle between the adjacent edges of the two second magnetic isolation grooves 9 is β03, and the central angle of a magnetic pole region is β01, and β01 = β02 = β03.

[0042] Specifically, the included angle between the two first magnetic isolation grooves 8 on the magnetic pole region is the same as the arc center angle of the magnetic pole region, and the included angle between the two second magnetic isolation grooves 9 on the magnetic pole region is the same as the arc center angle of the magnetic pole region, so that the first magnetic isolation grooves 8 and the second magnetic isolation grooves 9 on the magnetic pole structure can increase the reluctance torque ratio of the rotor punching structure, which is beneficial to improving the power density and torque density of the motor.

[0043] In some embodiments, the punching body 1 is provided with 6 or 8 magnetic pole regions, and the included angle between the two first magnetic steel grooves 6 in a magnetic pole structure is β04, and β04:β01 = 1.5 - 2.5.

[0044] Specifically, the included angle between the two first magnetic steel grooves 6, that is, the included angle of the V-shaped structure, is designed such that β04:β01 = 1.5 - 2.5, so that the included angle between the two first magnetic steel grooves 6 is greater than the arc center angle of the magnetic pole region, and the two first magnetic steel grooves 6 are symmetrically distributed along the d-axis 3, which can effectively increase the d-axis 3 reluctance and reduce the d-axis 3 inductance, thereby being beneficial to improving the saliency ratio of the motor, saving the amount of magnetic steel, and improving the field weakening diffusion ability of the motor.

[0045] In some embodiments, a third magnetic isolation groove 10 is provided at each end of the second magnetic steel groove 7, and the third magnetic isolation groove 10 is communicated with the second magnetic steel groove 7 and is located between the second magnetic isolation groove 9 and the second magnetic steel groove 7.

[0046] Specifically, the second magnetic isolation groove 9 is located on both end sides of the second magnetic steel groove 7 and is not communicated with the second magnetic steel groove 7. The third magnetic isolation groove 10 is located at both ends of the second magnetic steel groove 7 and is communicated with the second magnetic steel groove 7, which can make full use of the second magnetic isolation groove 9 to improve the stress intensity of the rotor punching structure, and further improve the stress intensity of the second magnetic steel groove 7 by using the third magnetic isolation groove 10, avoid magnetic leakage, and fully balance and match the requirements of the magnetic flux density distribution, stress intensity, and light weight of the rotor punching structure.

[0047] In some embodiments, a fourth magnetic isolation groove 11 is provided at one end of the first magnetic steel groove 6 away from the outer edge of the punching body 1, and the first magnetic isolation groove 8 and the fourth magnetic isolation groove 11 are communicated with the first magnetic steel groove 6.

[0048] Specifically, both ends of the first magnetic steel groove 6 are connected and communicated with the first magnetic isolation groove 8 and the second magnetic isolation groove 9. The first magnetic isolation groove 8 is located at one end of the first magnetic steel groove 6 close to the outer edge of the punching sheet body 1, and the fourth magnetic isolation groove 11 is located at one end of the first magnetic steel groove 6 close to the shaft hole 2 of the punching sheet body 1. The first magnetic isolation groove 8 and the fourth magnetic isolation groove 11 jointly act to improve the stress intensity of the first magnetic steel groove 6, avoid magnetic leakage, and fully and evenly match the requirements of the magnetic flux density distribution, stress intensity, and lightweight on the rotor punching sheet structure.

[0049] In some embodiments, as Figure 3 shown, two chamfers are provided on the side of the first magnetic isolation groove 8 close to the outer edge of the punching sheet body 1. Among them, the chamfer away from the second magnetic isolation groove 9 is larger.

[0050] Specifically, the side of the first magnetic isolation groove 8 close to the outer edge of the punching sheet body 1 and the outer edge of the punching sheet body 1 form a first magnetic isolation bridge 12. Two chamfers are provided on the side of the first magnetic isolation groove 8 close to the outer edge of the punching sheet body 1. One chamfer R02 is connected to the side of the first magnetic isolation groove 8 close to the second magnetic isolation groove 9, and the other chamfer R01 is connected to the side of the first magnetic isolation groove 8 close to the edge of its magnetic pole region (i.e., the q-axis 4). The chamfer close to the q-axis 4 is larger than the other chamfer, that is, R01 > R02, which can not only make the strength of the first magnetic isolation groove 8 meet the requirements, but also not affect the stress intensity requirements of the magnetic pole structure.

[0051] In some embodiments, as Figure 4 shown, two chamfers are provided on the side of the second magnetic isolation groove 9 close to the outer edge of the punching sheet body 1. Among them, the chamfer close to the first magnetic isolation groove 8 is larger.

[0052] Specifically, the side of the second magnetic isolation groove 9 close to the outer edge of the punching sheet body 1 and the outer edge of the punching sheet body 1 form a second magnetic isolation bridge 13. Two chamfers are provided on the side of the second magnetic isolation groove 9 close to the outer edge of the punching sheet body 1. One chamfer R03 is connected to the side of the second magnetic isolation groove 9 close to the first magnetic isolation groove 8, and the other chamfer R04 is connected to the axis of its magnetic pole region, that is, the q-axis 4. The chamfer close to the first magnetic isolation groove 8 is larger than the other chamfer, that is, R03 > R04, which can not only make the strength of the second magnetic isolation groove 9 meet the requirements, but also not affect the stress intensity requirements of the magnetic pole structure.

[0053] In some embodiments, as Figure 5As shown, two chamfers are provided on each of the two sides where the second magnetic isolation groove 9 and the third magnetic isolation groove 10 are close to each other. Among them, the chamfer of the second magnetic isolation groove 9 close to the outer edge of the punching sheet body 1 is the first chamfer, and the other chamfer is the second chamfer. The chamfer of the third magnetic isolation groove 10 close to the outer edge of the punching sheet body 1 is the third chamfer, and the other chamfer is the fourth chamfer. The first chamfer > the fourth chamfer > the third chamfer > the second chamfer.

[0054] Specifically, the two sides where the second magnetic isolation groove 9 and the third magnetic isolation groove 10 are close to each other form a third magnetic isolation bridge 14. The two sides where the second magnetic isolation groove 9 and the third magnetic isolation groove 10 are close to each other respectively belong to the second magnetic isolation groove 9 and the third magnetic isolation groove 10, and both sides are inclined. Then, the chamfer of the second magnetic isolation groove 9 close to the outer edge of the punching sheet body 1 is the first chamfer R06, and the other chamfer is the second chamfer R05. The chamfer of the third magnetic isolation groove 10 close to the outer edge of the punching sheet body 1 is the third chamfer R07, and the other chamfer is the fourth chamfer R08. The first chamfer R06 > the fourth chamfer R08 > the third chamfer R07 > the second chamfer R05.

[0055] The two sides where the second magnetic isolation groove 9 and the third magnetic isolation groove 10 are close to each other form an elongated quadrilateral structure, which can improve the utilization rate of the magnetic steel, reduce the magnetic leakage of the rotor by using the magnetic saturation effect, and the chamfers with different diameters are considered to meet the strength requirements of the rotor magnetic pole structure for the magnetic isolation bridge.

[0056] In some embodiments, as Figure 6 shown, two chamfers are provided on the edge of the fourth magnetic isolation groove 11 away from the first magnetic steel groove 6, and the chamfer close to the outer edge of the punching sheet body 1 is larger.

[0057] Specifically, the two sides where the fourth magnetic isolation grooves 11 on the two first magnetic steel grooves 6 are close to each other form a fourth magnetic isolation bridge 15. The fourth magnetic isolation grooves 11 on the two first magnetic steel grooves 6 are arranged close to each other, and the sides where they are close to each other form a rectangular structure. Two chamfers are provided on this side. Among them, the chamfer R10 close to the shaft hole 2 is smaller than the chamfer R09 close to the outer edge of the punching sheet body 1. After chamfering, it presents an overall back-to-back arc shape, similar to the edges of two ellipses. The chamfering is all considered to meet the strength requirements of the rotor magnetic pole structure for the magnetic isolation bridge.

[0058] In some embodiments, as Figure 1 and Figure 7As shown, the punching sheet structure further includes a plurality of weight-removing holes 5 uniformly arranged on the punching sheet body 1. The weight-removing holes 5 are located on the demarcation line of the magnetic pole region and are arranged close to the inner edge of the punching sheet body 1. The weight-removing holes 5 are polygonal, and one side thereof is arranged close to the inner edge of the punching sheet body 1 and has the same projection radian as that on the inner edge of the punching sheet body 1 but in the opposite direction.

[0059] Specifically, the weight-removing holes 5 are distributed one by one on the q-axis 4 and are arranged close to the shaft hole 2, that is, they are located between two adjacent magnetic pole structures and are arranged close to the fourth magnetic isolation groove 11 of the magnetic pole structure. This not only does not affect the function and effect of the magnetic pole structure but also can achieve the effect of reducing the weight of the punching sheet body 1, which is beneficial to the technical effect of lightening the weight of the rotor punching sheet structure.

[0060] The weight-removing holes 5 are symmetrically distributed with respect to the q-axis 4. One side thereof is symmetrically arranged with respect to the q-axis 4 and is arranged close to the edge of the shaft hole 2. This side has the same radian and arc length as the corresponding edge of the shaft hole 2, that is, the radius R12 of the shaft hole 2 is equal to the radius R11 of the edge of the weight-removing hole 5 close to the shaft hole 2, and the other edges of the weight-removing hole 5 are all provided with rounded corners. The shape of the weight-removing hole 5 is composed of various machinable shapes, but the strength requirements of the rotor punching sheet and the requirements of magnetic flux density saturation need to be considered. The shape of the weight-removing hole 5 close to the shaft hole 2 is generally in the shape of an arc with the center of the circle facing the outside of the rotor. The arc shape is to reduce the influence of the weight-removing hole 5 on the strength of the rotor magnetic pole structure.

[0061] Exemplarily, the weight-removing hole 5 is a triangular structure. One side thereof is symmetrically arranged with respect to the q-axis 4 and is arranged close to the edge of the shaft hole 2. This side has the same radian and arc length as the corresponding edge of the shaft hole 2, and the other edges of the weight-removing hole 5 are all provided with rounded corners.

[0062] Those of ordinary skill in the art should understand that the discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope of the present application (including the claims) is limited to these examples; under the concept of the present invention, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations in different aspects of the present invention as described above, which are not provided in detail for the sake of brevity.

[0063] The embodiments of the present invention are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A rotor punching structure of a permanent magnet synchronous motor, characterized in that, Including: A punching sheet body, the punching sheet body is evenly divided into a plurality of pole regions, and a pole structure is provided in each pole region; Each of the pole structures includes two symmetrically arranged first magnet slots and a second magnet slot located between the two first magnet slots; a first magnetic isolation slot is provided at one end of the first magnet slot close to the outer edge of the punching sheet body, and a second magnetic isolation slot is provided on each side of the two ends of the second magnet slot. The arc length corresponding to the extension lines of the mutually approaching edges of the two first magnetic isolation slots on the outer edge of the pole region is L02, and the arc length corresponding to the extension lines of the mutually approaching edges of the two second magnetic isolation slots on the outer edge of the pole region is L03. The outer edge arc length of a pole region is L01, L02:L01 = 0.6 to 0.9, L03:L01 = 0.2 to 0.

5.

2. A rotor punching sheet structure of a permanent magnet synchronous motor according to claim 1, characterized in that, The included angle between the edges of the two first magnetic isolation grooves close to each other is β 02 , the included angle between the edges of the two second magnetic isolation grooves close to each other is β03, the central angle of an arc of a magnetic pole region is β01, and β01 = β02 = β03.

3. A rotor punching sheet structure of a permanent magnet synchronous motor according to claim 2, characterized in that, There are 6 or 8 pole regions provided on the punching sheet body, and the included angle between the two first magnet slots in a pole structure is β04, β04:β01 = 1.5 to 2.

5.

4. A rotor punching structure of a permanent magnet synchronous motor according to claim 1, characterized in that, A third magnetic isolation slot is provided at each end of the second magnet slot. The third magnetic isolation slot is communicated with the second magnet slot and is located between the second magnetic isolation slot and the second magnet slot.

5. A rotor punching structure of a permanent magnet synchronous motor according to claim 1, characterized in that, A fourth magnetic isolation slot is provided at the end of the first magnet slot away from the outer edge of the punching sheet body. The first magnetic isolation slot and the fourth magnetic isolation slot are communicated with the first magnet slot.

6. A rotor punching structure of a permanent magnet synchronous motor according to claim 1, characterized in that, Two chamfers are provided on the edge of the first magnetic isolation slot close to the outer edge of the punching sheet body. Among them, the chamfer away from the second magnetic isolation slot is larger.

7. A rotor punching structure of a permanent magnet synchronous motor according to claim 1, characterized in that, Two chamfers are provided on the edge of the second magnetic isolation slot close to the outer edge of the punching sheet body. Among them, the chamfer close to the first magnetic isolation slot is larger.

8. A rotor punching structure of a permanent magnet synchronous motor according to claim 4, characterized in that, Two chamfers are provided on each of the two mutually approaching edges of the second magnetic isolation slot and the third magnetic isolation slot. Among them, the chamfer of the second magnetic isolation slot close to the outer edge of the punching sheet body is the first chamfer, and the other chamfer is the second chamfer. The chamfer of the third magnetic isolation slot close to the outer edge of the punching sheet body is the third chamfer, and the other chamfer is the fourth chamfer. The first chamfer > the fourth chamfer > the third chamfer > the second chamfer.

9. The rotor punching structure of a permanent magnet synchronous motor according to claim 5, wherein Two chamfers are provided on the edge of the fourth magnetic isolation slot away from the first magnet slot. Among them, the chamfer close to the outer edge of the punching sheet body is larger.

10. A rotor punching sheet structure of a permanent magnet synchronous motor according to claim 1, characterized in that, The punching sheet structure further includes a plurality of weight removal holes evenly provided on the punching sheet body. The weight removal holes are located on the demarcation line of the pole regions and are arranged close to the inner edge of the punching sheet body. The weight removal holes are polygons, and one side is arranged close to the inner edge of the punching sheet body and has the same projection arc as it on the inner edge of the punching sheet body but in the opposite direction.

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