Motor rotor, motor and mechanical structure

Abstract

The present invention provides a motor rotor, a motor and a mechanical structure. The motor rotor includes a rotor body, on which a first permanent magnetic pole and a second permanent magnetic pole are arranged, the first permanent magnetic pole and the second permanent magnetic pole are arranged alternately along the circumference of the rotor body, the first permanent magnetic pole includes at least two magnetic steels with different coercive forces, the first permanent magnetic pole is arranged in a W-shape, a first low-coercive force magnetic steel and a first high-coercive force magnetic steel arranged in series are arranged in the middle of the first permanent magnetic pole, and a second low-coercive force magnetic steel is arranged on both sides of the first permanent magnetic pole. Compared with the structure in the prior art, the structure of the motor rotor of the present application has a larger magnetic adjustment range in actual application, and the magnetic adjustment multiple is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of drive devices, and in particular to a motor rotor, a motor and a mechanical structure. Background Art

[0002] Traditional permanent magnet motors rely on permanent magnets to provide magnetic flux, but the magnetic field provided by permanent magnets is fixed, and the magnetic field inside the motor is difficult to adjust, making it difficult for permanent magnet motors to balance efficiency at high and low frequencies. And when the power supply voltage is fixed, the maximum operating frequency of the motor is limited.

[0003] At present, most permanent magnet motors have the disadvantage that the magnetic field is difficult to adjust, which leads to the maximum speed of the motor being limited by factors such as the input DC bus voltage, and the efficiency of the motor in low-speed and high-speed operation areas is difficult to balance. During the operation of the motor, the low-coercive force magnetic steel is affected by the high-coercive force magnetic steel, and the charging and demagnetization current is large, which will increase the difficulty of charging and demagnetizing the low-coercive force magnetic steel and reduce the efficiency of the motor.

[0004] In addition, some existing permanent magnet motors have solved the problem of large magnetizing current, but they still have the problem of small demagnetization current and the risk of demagnetization during normal operation. Figure 1 As shown, there are some permanent magnet motors that solve the problem of small demagnetization current. However, in this type of series structure, magnet 1 is a high coercive force magnet, magnet 2 is a low coercive force magnet, and magnet 3 is a high coercive force magnet. When a large current is applied during the demagnetization process, in order to ensure the stable magnetism of magnet 3, magnet 2 cannot apply too large a demagnetization current. Therefore, the demagnetization of magnet 2 is limited, resulting in a small magnetic adjustment range. Summary of the invention

[0005] The main purpose of the present invention is to provide a motor rotor, a motor and a mechanical structure to solve the problem of small magnetic field adjustment range of permanent magnet motors in the prior art.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a motor rotor is provided, including a rotor body, on which a first permanent magnet pole and a second permanent magnet pole are arranged alternately along the circumference of the rotor body, the first permanent magnet pole and the second permanent magnet pole are arranged alternately along the circumference of the rotor body, the first permanent magnet pole includes at least two magnetic steels with different coercive forces, the first permanent magnet pole is arranged in a W-shape, a first low-coercive force magnetic steel and a first high-coercive force magnetic steel arranged in series are arranged in the middle of the first permanent magnet pole, and the second low-coercive force magnetic steel is arranged on both sides of the first permanent magnet pole.

[0007] Furthermore, the magnetic steel of the second permanent magnet pole is a second high coercive force magnetic steel.

[0008] Further, the coercive force of the first high-coercive force magnetic steel is the same as or different from the coercive force of the second high-coercive force magnetic steel.

[0009] Further, the coercive force of the first low-coercive force magnetic steel is the same as or different from the coercive force of the second low-coercive force magnetic steel.

[0010] Furthermore, the coercive force of the first low-coercive force magnetic steel is 1 to 3 times higher than the coercive force of the second low-coercive force magnetic steel, and the remanence of the first low-coercive force magnetic steel is 1 to 1.2 times higher than the remanence of the second low-coercive force magnetic steel.

[0011] Furthermore, the second permanent magnetic poles are arranged in a straight line, a V shape or a W shape, and are symmetrically arranged about a magnetic pole center line of the second permanent magnetic pole.

[0012] Further, when the coercive force of the first low-coercive force magnetic steel is within 1.5 times higher than the coercive force of the second low-coercive force magnetic steel, the magnetic steel sizes are 1.15H1>H2>1.05H1, 1.4L2>L1>1.3L2, and H1*L1>H2*L2, 2.5H3>H2>2H3, 2.5L3>L2>2L3, wherein H1 is the width of the second low-coercive force magnetic steel, L1 is the length of the second low-coercive force magnetic steel, H2 is the width of the first low-coercive force magnetic steel, L2 is the length of the first low-coercive force magnetic steel, H3 is the width of the first high-coercive force magnetic steel, and L3 is the length of the first high-coercive force magnetic steel.

[0013] Further, when the coercive force of the first low-coercive force magnetic steel is within 1.5 to 3 times higher than the coercive force of the second low-coercive force magnetic steel, 1.05H1>H2>H1, 1.4L2>L1>1.1L2, and H1*L1>H2*L2, 4H3>H2>2.5H3, 3L3>L2>2L3, wherein H1 is the width of the second low-coercive force magnetic steel, L1 is the length of the second low-coercive force magnetic steel, H2 is the width of the first low-coercive force magnetic steel, L2 is the length of the first low-coercive force magnetic steel, H3 is the width of the first high-coercive force magnetic steel, and L3 is the length of the first high-coercive force magnetic steel.

[0014] Furthermore, the inter-pole width between the first permanent magnet pole and the second permanent magnet pole is 1.5 to 3 times the width of the second low coercive force magnetic steel.

[0015] Further, a cutting portion is provided at the outer edge of the rotor body, a groove is provided at the cutting portion, the groove is located between the first permanent magnet pole and the second permanent magnet pole, a magnetic isolation gap is provided at the end of the second permanent magnet pole, the depth of the groove is H, the distance between the bottom of the groove and the edge of the rotor body is H5, the width of the second high coercive force magnetic steel is H4, the maximum distance between the side extending along the length direction of the second high coercive force magnetic steel and the side wall of the magnetic isolation gap is H6, the angle between the first low coercive force magnetic steel and the magnetic pole center line of the first permanent magnet pole is a, the angle between the first low coercive force magnetic steel and the interpolar center line of the first permanent magnet pole and the second permanent magnet pole is a1, the angle between the magnetic pole center line of the first permanent magnet pole and the interpolar center line of the first permanent magnet pole and the second permanent magnet pole is θ, wherein 0.12a <a1<0.13a,a<0.92θ,0.8H5<H<H5,H4-H6<0.5H4。

[0016] Furthermore, the angle between the magnetic pole center line of the first permanent magnet pole and the inter-pole center line of the first permanent magnet pole and the second permanent magnet pole is θ, a magnetic isolation hole is provided on the side of the first permanent magnet pole, the minimum angle between the side of the magnetic isolation hole and the magnetic pole center line of the first permanent magnet pole is θ1, the maximum angle between the side of the magnetic isolation hole and the magnetic pole center line of the first permanent magnet pole is θ2, and the angle between the line connecting the second low coercive force magnetic steel, the first endpoint and the center of the rotor body and the magnetic pole center line of the first permanent magnet pole is θ3, wherein 0.55θ<θ1<0.6θ, θ3-θ2<θ2-θ1<0.15θ, and 0.7θ<θ3<0.75θ.

[0017] Further, the angle between the first high coercive force magnetic steel and the magnetic pole center line of the first permanent magnet pole is θ4, the angle between the first low coercive force magnetic steel and the magnetic pole center line of the first permanent magnet pole is θ6, and the angle between the second low coercive force magnetic steel and the magnetic pole center line of the first permanent magnet pole is θ5, wherein 2.5θ6<θ4<1.05θ, 1.12θ4<θ5<1.16θ4.

[0018] Further, when the second permanent magnet pole is arranged in a W shape, the angle between the magnetic pole center line of the first permanent magnet pole and the inter-pole center line of the first permanent magnet pole and the second permanent magnet pole is θ, the angle between the intermediate magnetic steel of the W shape and the magnetic pole center line of the second permanent magnet pole is θ9, the angle between the edge magnetic steel of the W shape and the magnetic pole center line of the second permanent magnet pole is θ8, and a magnetic isolation gap is provided between the end of the second permanent magnet pole and the rotor body, and the angle between the line connecting the end point of the magnetic isolation gap close to the magnetic pole center line of the second permanent magnet pole and the center of the rotor body and the magnetic pole center line of the second permanent magnet pole is θ7, wherein 0.64θ<θ9<0.7θ, 0.9θ9<θ7<1.2θ9, and 0.85θ<θ8<0.9θ.

[0019] Further, the first high-coercive force magnetic steel is arranged at one end of the first low-coercive force magnetic steel close to the center of the rotor body, and extends toward a direction close to the center of the rotor body and a magnetic pole center line of the first permanent magnet pole.

[0020] Furthermore, the motor rotor also includes a baffle, the rotor body includes a separation portion that separates the main body from the main body, one of the separation portion and the baffle is provided with a recessed portion, and the other of the two is provided with a raised portion that matches the recessed portion, and the baffle and the main body are fixedly connected together by fasteners.

[0021] Furthermore, the rotor body is made of laminated silicon steel sheets or amorphous alloy materials.

[0022] According to another aspect of the present invention, a motor is provided, comprising a motor rotor, wherein the motor rotor is the above-mentioned motor rotor.

[0023] According to yet another aspect of the present invention, a mechanical structure is provided, comprising a motor, wherein the motor is the motor described above.

[0024] By applying the technical solution of the present invention, the structure of partially connecting the first low-coercive force magnetic steel and the first high-coercive force magnetic steel in series is adopted in the present application to ensure that the anti-demagnetization ability of the first low-coercive force magnetic steel is improved, so that it is not affected by the demagnetization current during the flux change process, and the residual magnetism remains unchanged. Therefore, when the second low-coercive force magnetic steel plays a magnetic adjustment role during the flux change process, the magnetic direction of the second low-coercive force magnetic steel changes, and the magnetic direction of the first low-coercive force magnetic steel remains unchanged, and does not play a magnetic adjustment role. Therefore, compared with the structure in the prior art, the structure of the motor rotor of the present application has a larger magnetic adjustment range in the actual application process, and the magnetic adjustment multiple is effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0026] Figure 1 A schematic diagram shows a front view of an existing motor rotor;

[0027] Figure 2 Schematically shows a front view of a first embodiment of a motor rotor of the present invention;

[0028] Figure 3 A first front view schematically shows a second embodiment of a motor rotor of the present invention;

[0029] Figure 4 A second front view schematically shows a second embodiment of the motor rotor of the present invention;

[0030] Figure 5 A schematic diagram shows a front view of a rotor body in a third embodiment of a motor rotor of the present invention;

[0031] Figure 6 Schematically shows a front view of a baffle in a third embodiment of a motor rotor of the present invention;

[0032] Figure 7 Schematically shows Figure 6 AA section view in;

[0033] Figure 8 The schematic diagram shows the different current Figure 1 The residual magnetism comparison result diagram of the magnetic steels 2 and 3 in the figure and the first low coercive force magnetic steel and the second low coercive force magnetic steel in the present application.

[0034] The above drawings include the following reference numerals:

[0035] 10. Rotor body; 11. First permanent magnet pole; 111. First low coercive force magnetic steel; 112. Second low coercive force magnetic steel; 113. First high coercive force magnetic steel; 12. Second permanent magnet pole; 121. Second high coercive force magnetic steel; 13. Cutting portion; 14. Groove; 15. Magnetic isolation hole; 16. Magnetic isolation gap; 17. Main body; 18. Separation portion; 181. Recessed portion; 20. Baffle; 21. Protrusion. DETAILED DESCRIPTION

[0036] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0037] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0038] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations, and the spatially relative descriptions used herein are interpreted accordingly.

[0039] See also Figures 2 to 7 As shown, according to an embodiment of the present invention, a motor is provided. The motor in this embodiment particularly refers to a variable flux motor.

[0040] However, the magnetic field adjustment range of the existing variable flux motor is relatively small. Therefore, the structure of the motor rotor of the motor is improved in the present application.

[0041] See also Figure 1As shown, in the first embodiment of the present invention, the motor rotor includes a rotor body 10, on which a first permanent magnet pole 11 and a second permanent magnet pole 12 are arranged, wherein the first permanent magnet pole 11 and the second permanent magnet pole 12 are alternately arranged along the circumference of the rotor body 10, and the first permanent magnet pole 11 includes at least two magnetic steels with different coercive forces, specifically, the first permanent magnet pole 11 is arranged in a W shape, and is arranged symmetrically about the magnetic pole center line of the first permanent magnet pole 11. A first low coercive force magnetic steel 111 and a first high coercive force magnetic steel 113 arranged in series are arranged in the middle of the first permanent magnet pole 11, and a second low coercive force magnetic steel 112 is arranged on both sides of the first permanent magnet pole 11. It should be noted that, in this embodiment, the arrangement of the first high coercive force magnetic steel 113 and the first low coercive force magnetic steel 111 in series means that the magnetic lines of force flow from the first low coercive force magnetic steel 111 to the first high coercive force magnetic steel 113, that is, the equivalent circuit diagram of the motor is the arrangement of the first high coercive force magnetic steel 113 and the first low coercive force magnetic steel 111 in series.

[0042] Relative to Figure 1 For the motor rotor, Figure 1 The structure in the figure increases the magnetic adjustment range by increasing the thickness of the middle magnetic steel 3 under the magnetic adjustment pole. However, the increase in the thickness of the magnetic steel 3 has a limited effect on the anti-demagnetization ability of the middle magnetic steel 3. When the demagnetization current increases to a certain extent, the middle magnetic steel 3 will also demagnetize. At this time, the magnetic steel 2 has not reached reverse saturation, which affects the reverse magnetic adjustment range. Figure 2 As shown, in the present application, a structure of partially connecting the first low coercive force magnetic steel 111 and the first high coercive force magnetic steel 113 in series is adopted to ensure that the anti-demagnetization ability of the first low coercive force magnetic steel 111 is improved, so that it is not affected by the demagnetization current during the variable flux process, and the residual magnetism remains unchanged. Therefore, when the second low coercive force magnetic steel 112 plays a magnetic adjustment role during the variable flux process, the magnetic direction of the second low coercive force magnetic steel 112 changes, and the magnetism of the first low coercive force magnetic steel 111 remains unchanged, and does not play a magnetic adjustment role.

[0043] like Figure 8 As shown, from different current Figure 1 From the comparison results of the remanence of the magnetic steels 2 and 3 in the present application with the first low coercive force magnetic steel 111 and the second low coercive force magnetic steel 112, in the figure, b1 represents the second low coercive force magnetic steel 112, b2 represents the first low coercive force magnetic steel 111, a1 represents the magnetic steel 2, and a2 represents the magnetic steel 3. During the demagnetization current application, when the second low coercive force magnetic steel 112 reaches a state close to reverse saturation, the remanence of the first low coercive force magnetic steel 111 remains substantially unchanged, while Figure 1 When the magnetic steel 1 just reverses, the residual magnetism of the magnetic steel 2 has decreased. If the demagnetization current continues to increase, the magnetic steel 2 is in an abnormal state. Therefore, the structure of the motor rotor of the present application is relatively Figure 1The structure has a wider magnetic adjustment range in actual application and the magnetic adjustment multiple is effectively improved.

[0044] In the present embodiment, the magnetic steel of the second permanent magnet pole 12 is the second high coercive force magnetic steel 121. In actual design, the second permanent magnet poles 12 are arranged in a straight line, a V shape or a W shape, and are symmetrically arranged about the magnetic pole center line of the second permanent magnet pole 12, which can increase the effective magnetic flux area of ​​the magnetic pole adjusting magnetic steel, facilitate reducing the magnetizing current of the motor, and increase the demagnetization current of the motor.

[0045] In actual design, the coercive forces of the first high-coercive-force magnetic steel 113 and the second high-coercive-force magnetic steel 121 in this embodiment may be the same or different.

[0046] Similarly, the coercive force of the first low-coercive force magnetic steel 111 and the second low-coercive force magnetic steel 112 in this embodiment can be the same or different. Compared with the first high-coercive force magnetic steel 113 and the second high-coercive force magnetic steel 121, the first low-coercive force magnetic steel 111 and the second low-coercive force magnetic steel 112 in this embodiment are still relatively low. In this application, the coercive force of the first low-coercive force magnetic steel 111 is set to about 100KA / m, and the corresponding coercive force of the first high-coercive force magnetic steel 113 and the second high-coercive force magnetic steel 121 is about 900KA / m to 1000KA / m, which is actually designed according to the specific needs of the motor.

[0047] In a preferred embodiment of the present invention, the coercive force of the first low-coercive force magnetic steel 111 and the second low-coercive force magnetic steel 112 are different. Specifically, the coercive force of the first low-coercive force magnetic steel 111 is 1 to 3 times higher than that of the second low-coercive force magnetic steel 112, and the remanence of the first low-coercive force magnetic steel 111 is 1 to 1.2 times that of the second low-coercive force magnetic steel 112.

[0048] Specifically, when the coercive force of the first low-coercive force magnetic steel 111 is within 1.5 times higher than the coercive force of the second low-coercive force magnetic steel 112, each magnetic steel meets the following conditions: 1.15H1>H2>1.05H1; 1.4L2>L1>1.3L2; and H1*L1>H2*L2; 2.5H3>H2>2H3, 2.5L3>L2>2L3, wherein H1 is the width of the second low-coercive force magnetic steel 112, L1 is the length of the second low-coercive force magnetic steel 112, H2 is the width of the first low-coercive force magnetic steel 111, L2 is the length of the first low-coercive force magnetic steel 111, H3 is the width of the first high-coercive force magnetic steel 113, and L3 is the length of the first high-coercive force magnetic steel 113. It can be known from experimental verification that under such conditions, the demagnetization current can be effectively increased, the magnetization current can be reduced, and the demagnetization problem of the motor rotor can be improved.

[0049] When the coercivity of the first low-coercivity magnetic steel 111 is within 1.5 to 3 times higher than that of the second low-coercivity magnetic steel 112, 1.05H1>H2>H1; 1.4L2>L1>1.1L2; and H1*L1>H2*L2, 4H3>H2>2.5H3, 3L3>L2>2L3, wherein H1 is the width of the second low-coercivity magnetic steel 112, L1 is the length of the second low-coercivity magnetic steel 112, H2 is the width of the first low-coercivity magnetic steel 111, L2 is the length of the first low-coercivity magnetic steel 111, H3 is the width of the first high-coercivity magnetic steel 113, and L3 is the length of the first high-coercivity magnetic steel 113. Under such conditions, the demagnetization current can be effectively increased by 15%, the magnetization current can be reduced by 10%, and the demagnetization problem of the motor rotor can be improved.

[0050] Preferably, the inter-pole width between the first permanent magnetic pole 11 and the second permanent magnetic pole 12 is 1.5 to 3 times the width of the second low coercive force magnetic steel 112, which can effectively improve the magnetic adjustment range of the motor rotor.

[0051] In actual design, the first high coercive force magnetic steel 113 in this embodiment is arranged at one end of the first low coercive force magnetic steel 111 close to the center of the rotor body 10, and extends toward the center of the rotor body 10 and the direction of the magnetic pole center line of the first permanent magnet pole 11, so that the middle part of the entire first permanent magnet pole 11 is a quadrilateral. Of course, in other embodiments of the present invention, the first high coercive force magnetic steel 113 can also be arranged in a direction perpendicular to the magnetic pole center line of the first permanent magnet pole 11. As long as it is other deformation methods under the conception of the present invention, they are within the protection scope of the present invention.

[0052] See also Figure 3 and Figure 4 As shown, according to the second embodiment of the present invention, a new type of motor rotor is provided. The structure of the motor rotor in this embodiment is basically the same as that of the motor rotor in the first embodiment. The difference is that a cutting portion 13 is provided at the outer edge of the rotor body 10 in this embodiment. A groove 14 is provided at the cutting portion 13. The groove 14 is located between the first permanent magnetic pole 11 and the second permanent magnetic pole 12. A magnetic isolation gap 16 is provided at the end of the second permanent magnetic pole 12. The depth of the groove 14 is H. The bottom of the groove 14 is adjacent to the side of the rotor body 10. The distance between the edge is H5, the width of the second high coercive force magnetic steel 121 is H4, the maximum distance between the side extending along the length direction of the second high coercive force magnetic steel 121 and the side wall of the magnetic isolation gap 16 is H6, the angle between the first low coercive force magnetic steel 111 and the magnetic pole center line of the first permanent magnet pole 11 is a, the angle between the first low coercive force magnetic steel 111 and the inter-pole center line of the first permanent magnet pole 11 and the second permanent magnet pole 12 is a1, and the angle between the magnetic pole center line of the first permanent magnet pole 11 and the inter-pole center line of the first permanent magnet pole 11 and the second permanent magnet pole 12 is θ.

[0053] After adding the design of the inter-pole groove 14, the groove 14 structure guides the magnetic lines of force from the high coercivity permanent magnet to the stator, reducing its influence on the magnetic flux regulating permanent magnet in the variable magnetic pole (i.e., the second low coercivity permanent magnet 112). Therefore, the short-circuit effect of the magnetic flux regulating permanent magnet on the low coercivity permanent magnet (i.e., the first low coercivity permanent magnet 111) under the same pole increases, reducing the overall machine magnetic chain at this time and increasing the magnetic flux regulation ability. The influencing rule is that the larger its a1, the smaller H5 minus H, and the larger the magnetic flux regulation range. At the same time, this dimension has a greater impact on the torque ripple of the motor. The smaller a1, the larger H5 minus H, and the smaller its torque ripple. Therefore, this structure has an optimal dimension.

[0054] Specifically, the included angle between the magnetic pole center line of the first permanent magnet pole 11 and the inter-pole center line of the first permanent magnet pole 11 and the second permanent magnet pole 12 is θ. There is a magnetic isolation hole 15 on the side of the first permanent magnet pole 11. The minimum included angle between the side of the magnetic isolation hole 15 and the magnetic pole center line of the first permanent magnet pole 11 is θ1, and the maximum included angle between the side of the magnetic isolation hole 15 and the magnetic pole center line of the first permanent magnet pole 11 is θ2. The included angle between the connection line of the second low coercivity permanent magnet 112 and the first end point (here the first end point refers to an end point of the second low coercivity permanent magnet 112 that is close to the outer edge of the rotor body 10 and close to the magnetic pole center line of the first permanent magnet pole 11) and the center of the rotor body 10 and the magnetic pole center line of the first permanent magnet pole 11 is θ3. The included angle between the first high coercivity permanent magnet 113 and the magnetic pole center line of the first permanent magnet pole 11 is θ4. The included angle between the first low coercivity permanent magnet 111 and the magnetic pole center line of the first permanent magnet pole 11 is θ6. The included angle between the second low coercivity permanent magnet 112 and the magnetic pole center line of the first permanent magnet pole 11 is θ5. Among them, when the second permanent magnet pole 12 is arranged in a W shape, the included angle between the magnetic pole center line of the first permanent magnet pole 11 and the inter-pole center line of the first permanent magnet pole 11 and the second permanent magnet pole 12 is θ. The included angle between the middle magnet of the W shape and the magnetic pole center line of the second permanent magnet pole 12 is θ9. The included angle between the edge magnet of the W shape and the magnetic pole center line of the second permanent magnet pole 12 is θ8. There is a magnetic isolation gap 16 between the end of the second permanent magnet pole 12 and the rotor body 10. The included angle between the connection line of the end point of the magnetic isolation gap 16 close to the magnetic pole center line of the second permanent magnet pole 12 and the center of the rotor body 10 and the magnetic pole center line of the second permanent magnet pole 12 is θ7. Preferably, when 0.12a < a1 < 0.13a, a < 0.92θ, 0.8H5 < H < H5, H4 - H6 < 0.5H4; 0.55θ < θ1 < 0.6θ, θ3 - θ2 < θ2 - θ1 < 0.15θ, 0.7θ < θ3 < 0.75θ; 0.64θ < θ9 < 0.7θ, 0.9θ9 < θ7 < 1.2θ9, 0.85θ < θ8 < 0.9θ, the motor has the best efficiency in the normal magnetic chain state or the minimum magnetic chain state and better magnetic flux regulation effect under this dimension.

[0055] According to the experiment, Table 1 is obtained. Table 1 is for the motor rotor in this embodiment and Figure 1The comparison of motor rotor magnetic speed regulation is as follows:

[0056] plan Normal magnetic link Reverse flux Magnetic modulation multiple (forward / reverse) Figure 1 Solution 559.4mWb 430.2mWb 1.3 The solution of this application 553.4mWb 369.8mWb 1.5

[0057] From the results, it can be seen that the structure of the motor rotor in this application increases the magnetic field adjustment range by 15%.

[0058] See also Figures 5 to 7 As shown, according to the third embodiment of the present invention, a motor rotor is provided. The structure of the motor rotor in this embodiment is basically the same as that of the motor rotor in the second embodiment. The difference is that in order to form a magnetic steel groove for installing the magnetic steel of the first permanent magnet pole 11, the rotor body 10 of the motor rotor in this embodiment is divided into two structures, and the separated rotor body 10 is fixed together by a baffle 20. Specifically, the rotor body 10 includes a main body 17 and a separation part 18 separated from the main body 17. A recessed part 181 is provided on one of the separation part 18 and the baffle 20, and a protrusion 21 adapted to the recessed part 181 is provided on the other of the two. During actual assembly, the baffle 20 and the main body 17 are fixedly connected together by fasteners, and then the main body 17 and the separation part 18 are fixed on the baffle 20. The structure is simple, stable and reliable. Preferably, the fastener in this embodiment is a structure such as a fastening screw, a pin or a rivet. As long as it is other deformation methods under the conception of the present invention, it is within the protection scope of the present invention.

[0059] Preferably, the rotor body 10 in this embodiment can be made of laminated silicon steel sheets, or can be made of amorphous alloy materials. As long as it is other deformation methods based on the concept of the present invention, it is within the protection scope of the present invention.

[0060] According to another aspect of the present invention, a mechanical structure is provided, and the mechanical structure particularly refers to products suitable for wide-band operation, such as compressors and washing machines. The mechanical structure includes the motor in the above embodiment.

[0061] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects: the motor of the present application can realize magnetic modulation, and the magnetic modulation multiple is wide, and can be applied to products with wide working frequency and multiple working conditions, such as compressor motors, washing machine motors, etc., and the motor is suitable for motors with various slot-pole combinations.

[0062] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A motor rotor, It is characterized in that The invention comprises a rotor body (10), wherein a first permanent magnetic pole (11) and a second permanent magnetic pole (12) are arranged on the rotor body (10), wherein the first permanent magnetic pole (11) and the second permanent magnetic pole (12) are alternately arranged along the circumference of the rotor body (10), wherein the first permanent magnetic pole (11) comprises at least two magnetic steels with different coercive forces, wherein the first permanent magnetic pole (11) is arranged in a W-shape, wherein a first low-coercive force magnetic steel (111) and a first high-coercive force magnetic steel (113) arranged in series are arranged in the middle of the first permanent magnetic pole (11), and the second low-coercive force magnetic steel (112) is arranged on both sides of the first permanent magnetic pole (11); The angle between the first high coercive force magnetic steel (113) and the magnetic pole center line of the first permanent magnet pole (11) is θ4, the angle between the first low coercive force magnetic steel (111) and the magnetic pole center line of the first permanent magnet pole (11) is θ6, and the angle between the second low coercive force magnetic steel (112) and the magnetic pole center line of the first permanent magnet pole (11) is θ5, wherein 2.5θ6<θ4<1.05θ, 1.12θ4<θ5<1.16θ4; the angle between the magnetic pole center line of the first permanent magnet pole (11) and the inter-pole center line of the first permanent magnet pole (11) and the second permanent magnet pole (12) is θ.

2. The motor rotor according to claim 1, It is characterized in that The magnetic steel of the second permanent magnetic pole (12) is second high coercive force magnetic steel (121).

3. The motor rotor according to claim 2, It is characterized in that The coercive force of the first high-coercive-force magnetic steel (113) is the same as or different from the coercive force of the second high-coercive-force magnetic steel (121).

4. The motor rotor according to claim 1, It is characterized in that The coercive force of the first low-coercive-force magnetic steel (111) is the same as or different from the coercive force of the second low-coercive-force magnetic steel (112).

5. The motor rotor according to claim 1, It is characterized in that The coercive force of the first low-coercive force magnetic steel (111) is 1 to 3 times higher than the coercive force of the second low-coercive force magnetic steel (112), and the remanence of the first low-coercive force magnetic steel (111) is 1 to 1.2 times the remanence of the second low-coercive force magnetic steel (112).

6. The motor rotor according to claim 1, It is characterized in that The second permanent magnetic poles (12) are arranged in a straight line, a V shape or a W shape, and are symmetrically arranged about a magnetic pole center line of the second permanent magnetic pole (12).

7. The motor rotor according to claim 5, It is characterized in that When the coercive force of the first low-coercive force magnetic steel (111) is within 1.5 times higher than the coercive force of the second low-coercive force magnetic steel (112), the magnetic steel dimensions are 1.15H1>H2>1.05H1, 1.4L2>L1>1.3L2, and H1*L1>H2*L2, 2.5H3>H2>2H3, 2.5L3>L2>2L3, wherein H1 is the width of the second low-coercive force magnetic steel (112), L1 is the length of the second low-coercive force magnetic steel (112), H2 is the width of the first low-coercive force magnetic steel (111), L2 is the length of the first low-coercive force magnetic steel (111), H3 is the width of the first high-coercive force magnetic steel (113), and L3 is the length of the first high-coercive force magnetic steel (113).

8. The motor rotor according to claim 5, It is characterized in that When the coercive force of the first low-coercive force magnetic steel (111) is within 1.5 to 3 times higher than the coercive force of the second low-coercive force magnetic steel (112), 1.05H1>H2>H1, 1.4L2>L1>1.1L2, and H1*L1>H2*L2, 4H3>H2>2.5H3, 3L3>L2>2L3, wherein H1 is the width of the second low-coercive force magnetic steel (112), L1 is the length of the second low-coercive force magnetic steel (112), H2 is the width of the first low-coercive force magnetic steel (111), L2 is the length of the first low-coercive force magnetic steel (111), H3 is the width of the first high-coercive force magnetic steel (113), and L3 is the length of the first high-coercive force magnetic steel (113).

9. The motor rotor according to claim 1, It is characterized in that The inter-pole width between the first permanent magnetic pole (11) and the second permanent magnetic pole (12) is 1.5 to 3 times the width of the second low coercive force magnetic steel (112).

10. The motor rotor according to claim 2, It is characterized in that The outer edge of the rotor body (10) is provided with a cutting portion (13), the cutting portion (13) is provided with a groove (14), the groove (14) is located between the first permanent magnetic pole (11) and the second permanent magnetic pole (12), the end of the second permanent magnetic pole (12) is provided with a magnetic isolation gap (16), the depth of the groove (14) is H, the distance between the bottom of the groove (14) and the edge of the rotor body (10) is H5, the width of the second high coercive force magnetic steel (121) is H4, and the second high coercive force magnetic steel (121) is H5. 21) The maximum spacing between the side extending in the length direction and the side wall of the magnetic isolation gap (16) is H6, the angle between the first low coercive force magnetic steel (111) and the magnetic pole center line of the first permanent magnetic pole (11) is a, the angle between the first low coercive force magnetic steel (111) and the inter-pole center line of the first permanent magnetic pole (11) and the second permanent magnetic pole (12) is a1, and the angle between the magnetic pole center line of the first permanent magnetic pole (11) and the inter-pole center line of the first permanent magnetic pole (11) and the second permanent magnetic pole (12) is θ, wherein 0.12a <a1<0.13a,a<0.92θ,0.8H5<H<H5,H4-H6<0.5H4。 11. The motor rotor according to claim 1, It is characterized in that A magnetic isolation hole (15) is provided on the side of the first permanent magnetic pole (11), the minimum angle between the side of the magnetic isolation hole (15) and the magnetic pole center line of the first permanent magnetic pole (11) is θ1, the maximum angle between the side of the magnetic isolation hole (15) and the magnetic pole center line of the first permanent magnetic pole (11) is θ2, and the angle between the second low coercive force magnetic steel (112), the first end point and the center of the rotor body (10) and the magnetic pole center line of the first permanent magnetic pole (11) is θ3, wherein 0.55θ<θ1<0.6θ, θ3-θ2<θ2-θ1<0.15θ, and 0.7θ<θ3<0.75θ.

12. The motor rotor according to claim 1, It is characterized in that When the second permanent magnet pole (12) is arranged in a W shape, the angle between the magnetic pole center line of the first permanent magnet pole (11) and the inter-pole center line of the first permanent magnet pole (11) and the second permanent magnet pole (12) is θ, the angle between the intermediate magnetic steel of the W shape and the magnetic pole center line of the second permanent magnet pole (12) is θ9, the angle between the edge magnetic steel of the W shape and the magnetic pole center line of the second permanent magnet pole (12) is θ8, a magnetic isolation gap (16) is provided between the end of the second permanent magnet pole (12) and the rotor body (10), the angle between the line connecting the end point of the magnetic isolation gap (16) close to the magnetic pole center line of the second permanent magnet pole (12) and the center of the rotor body (10) and the magnetic pole center line of the second permanent magnet pole (12) is θ7, wherein 0.64θ<θ9<0.7θ, 0.9θ9<θ7<1.2θ9, and 0.85θ<θ8<0.9θ.

13. The motor rotor according to claim 1, It is characterized in that The first high coercive force magnetic steel (113) is arranged at one end of the first low coercive force magnetic steel (111) close to the center of the rotor body (10), and extends in a direction close to the center of the rotor body (10) and the magnetic pole center line of the first permanent magnet (11).

14. The motor rotor according to claim 1, It is characterized in that The motor rotor further comprises a baffle (20); the rotor body (10) comprises a main body (17) and a separation portion (18) separating the main body (17); a recessed portion (181) is provided on one of the separation portion (18) and the baffle (20); a protrusion (21) matching the recessed portion (181) is provided on the other of the two; and the baffle (20) and the main body (17) are fixedly connected together by fasteners.

15. The electric machine rotor according to any one of claims 1 to 14, It is characterized in that The rotor body (10) is made of laminated silicon steel sheets or amorphous alloy material.

16. A motor, comprising a motor rotor, It is characterized in that The motor rotor is the motor rotor according to any one of claims 1 to 15.

17. A mechanical structure comprising a motor, It is characterized in that The motor is the motor described in claim 16.

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