A stator-rotor structure and motor for an electric supercharger

Abstract

The utility model discloses a kind of stator-rotor structures for electric supercharger, it is related to electric supercharger technical field, including coaxial arrangement stator and rotor, there is air gap between rotor and stator, stator includes stator tooth and stator pole shoe, multiple stator teeth are arranged on the circumferential inner wall surface of stator tooth in circumferential interval, stator tooth extends inward along radial and inner end is arranged with stator pole shoe, rotor includes rotor sheath and rotor magnet, rotor sheath is coaxially sleeved on rotor magnet, the side wall surface of stator pole shoe away from stator tooth is arranged with open straight groove, the circumferential outer wall surface of rotor sheath is arranged with recessed open inclined groove, open inclined groove is arranged in helical extension. The stator-rotor structure and motor for electric supercharger provided by the utility model are convenient to process and reduce torque ripple and motor noise decibel value in existing motor.

Description

Technical Field

[0001] This utility model relates to the field of electric turbocharger motor technology, and in particular to a stator and rotor structure and motor for an electric turbocharger. Background Technology

[0002] like Figure 1 and Figure 2 As shown, existing rotating electric machines consist of a stator and a rotor, and there is inevitably a certain air gap between them. The air gap is crucial for the conversion of electromagnetic energy and mechanical energy, and its absolute value and variation have a significant impact on the machine's performance. Traditional high-speed rotor motors typically design the air gap length to be of a uniform value to improve power density. However, this exacerbates armature reaction, affecting the machine's performance indicators. This is because armature reaction affects the distribution of the air gap magnetic field, leading to severe distortion of the air gap magnetic flux density and back electromotive force. Simultaneously, armature reaction causes a decrease in the machine's output torque and an increase in torque pulsation, a problem that becomes more severe under heavy load conditions.

[0003] The utility model patent with patent application number 202310188511.X, entitled "A stator and rotor structure of an electric motor and an electric motor", improves the rotor cutting edge design. By changing the setting of the air gap length of the rotor cutting edge, it reduces the noise decibel value of the existing motor and neutral motor. However, the manufacturing process of this patent is complicated and it is difficult to promote and apply it in the market.

[0004] Therefore, it is necessary to propose a stator-rotor structure and motor for electric turbochargers to solve or at least alleviate some of the aforementioned defects. Utility Model Content

[0005] The main objective of this invention is to provide a stator and rotor structure and a motor for an electric booster, aiming to solve or at least partially solve the aforementioned technical problems.

[0006] To achieve the above objectives, this utility model provides a stator and rotor structure for an electric booster, including a stator and a rotor arranged coaxially, with an air gap between the rotor and the stator. The stator includes a stator ferrule, stator teeth, and stator pole shoes. Multiple stator teeth are arranged circumferentially at intervals on the inner circumferential wall of the stator ferrule. The stator teeth extend radially inward and the inner ends are provided with stator pole shoes. The rotor includes a rotor sleeve and a rotor magnet. The rotor sleeve is coaxially fitted on the rotor magnet. An open straight groove is arranged on the side wall of the stator pole shoe away from the stator teeth. An inwardly recessed open oblique groove is arranged on the outer circumferential wall of the rotor sleeve. The open oblique groove extends in a spiral shape.

[0007] Furthermore, the rotor magnet includes two rotor magnetic poles symmetrically arranged along the axis. The rotor magnetic poles are arranged in a spiral twist. The two rotor magnetic poles are spliced ​​together circumferentially to form a cylindrical structure. The rotor sheath is fitted on the cylindrical structure. One rotor magnetic pole is the N pole and the other rotor magnetic pole is the S pole.

[0008] Furthermore, the open inclined slot extends along the helical direction to both ends of the rotor sheath, the two open inclined slots are symmetrically arranged along the axis, and the opening inclined slots and the magnetic pole splicing line of the rotor magnet are arranged radially aligned.

[0009] Furthermore, the helical angle of the magnetic pole splicing line is no greater than 10 degrees.

[0010] Furthermore, the helical angle of the magnetic pole splicing line is 5 degrees.

[0011] Furthermore, the open straight groove is a gradually expanding U-shaped groove with its diameter gradually increasing radially inward.

[0012] Furthermore, the open straight slot extends axially and penetrates to both ends of the rotor sheath.

[0013] Furthermore, 12 stator teeth are evenly spaced along the circumference on the inner circumferential wall of the stator.

[0014] This utility model also provides an electric motor including a body and the above-mentioned stator and rotor structure for an electric booster. The body is provided with a receiving cavity, the rotor is arranged along the shaft and rotatably supported on the body, the stator is fixed on the body and located outside the rotor, and the stator and rotor are arranged radially opposite each other.

[0015] Compared with the prior art, the stator and rotor structure for electric turbochargers provided by this utility model has the following advantages:

[0016] The stator-rotor structure for an electric booster provided by this utility model drives the rotor to rotate around its axis through the mutual magnetic force between the stator and rotor. An open straight slot is arranged on the side wall of the stator pole shoe away from the stator teeth, and an inwardly recessed open oblique slot is arranged on the outer circumferential wall of the rotor sleeve. The open oblique slots extend in a spiral shape, allowing for direct formation of the open straight slot on the inner wall of the stator pole shoe and the open oblique slot on the outer wall of the rotor sleeve, facilitating processing. Using this utility model, the air gap magnetic flux density curve and waveform between the stator and rotor of the motor are closer to a sine wave, reducing the noise level of existing motors and lowering the decibel value. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the stator structure in a stator-rotor structure in the prior art;

[0019] Figure 2 This is a schematic diagram of the rotor structure in the stator-rotor structure of the prior art, where a is a top view of the rotor structure; b is a cross-sectional view of the rotor structure.

[0020] Figure 3 This is a schematic diagram of the outer rotor structure of the stator and rotor structure for an electric supercharger in one embodiment of the present invention;

[0021] Figure 4 This is a schematic diagram of the rotor structure of the stator and rotor structure for an electric supercharger in one embodiment of the present invention, wherein a is a top view of the rotor structure; b is a cross-sectional view of the rotor structure;

[0022] Figure 5 for Figure 4 A schematic diagram of the cross-sectional structure of the rotor magnet in the image;

[0023] Figure 6 This is a three-dimensional structural diagram of the stator and rotor structure for an electric booster according to one embodiment of the present invention;

[0024] Figure 7 yes Figure 6 A schematic diagram of the rotor's explosion;

[0025] Figure 8 This is a waveform diagram of the cogging torque of a motor in the prior art;

[0026] Figure 9 This is a waveform diagram of the motor cogging torque according to a specific embodiment of this application;

[0027] Figure 10 This is a schematic diagram of the motor structure in one embodiment of the present invention.

[0028] Legend:

[0029] 10. Stator and rotor structure for electric turbochargers; 11. Stator; 111. Stator pin; 112. Stator teeth; 113. Stator pole shoes; 114. Open straight slot; 12. Rotor; 121. Rotor sleeve; 1211. Open oblique slot; 122. Rotor magnet; 1221. Rotor pole; 1222. Pole splicing line; 13. Air gap; 100. Motor; 20. Body.

[0030] The purpose, features, and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0031] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0034] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0035] Please refer to the appendix. Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7This utility model provides a stator-rotor structure 10 for an electric booster, including a stator 11 and a rotor 12 arranged coaxially, with an air gap 13 between the rotor 12 and the stator 11. The stator 11 includes a stator spool 111, stator teeth 112, and stator pole shoes 113. Multiple stator teeth 112 are arranged circumferentially at intervals on the inner circumferential wall of the stator spool 111. The stator teeth 112 extend radially inward and the inner end is provided with a stator pole shoe 113. The rotor 12 includes a rotor sleeve 121 and a rotor magnet 122. The rotor sleeve 121 is coaxially sleeved on the rotor magnet 122. The side wall of the stator pole shoe 113 away from the stator teeth 112 is provided with an open straight groove 114. The outer circumferential wall of the rotor sleeve 121 is provided with an inwardly recessed open inclined groove 1211, which extends in a spiral shape.

[0036] The stator-rotor structure 10 for an electric booster provided by this utility model drives the rotor 12 to rotate around the axis of rotation through the mutual magnetic force between the stator 11 and the rotor 12. An open straight groove 114 is arranged on the side wall of the stator pole shoe 113 away from the stator teeth 112, and an inwardly recessed open inclined groove 1211 is arranged on the outer circumferential wall of the rotor sleeve 121. The open inclined groove 1211 extends in a spiral shape, which can directly form the open straight groove 114 on the inner wall of the stator pole shoe 113 and the open inclined groove 1211 on the outer wall of the rotor sleeve 121, which is convenient for processing. After adopting the solution of this utility model, the air gap magnetic flux density curve and air gap magnetic flux density waveform between the stator and rotor of the motor 100 are more inclined to a sine wave, which reduces the noise decibel value of the existing motor 100 and the neutral motor 100.

[0037] Research has shown that the more uniform the air gap 13, the better the working performance of the motor 100, but the greater the fluctuation. In order to reduce fluctuation and balance working performance, the present invention arranges open inclined slots 1211 to make the air gap magnetic flux density more non-uniform. After adopting open inclined slots 1211, the tooth harmonic potential induced in different parts of a conductor on the stator tooth 112 has different phases, which can effectively weaken the harmonic electromotive force generated by the tooth harmonic magnetic field, thereby weakening the additional torque caused by these harmonic magnetic fields. Furthermore, due to the weakening of tooth harmonics, the magnetic waves formed by the interaction of higher harmonics are reduced, thus effectively controlling the electromagnetic vibration and noise of the motor 100.

[0038] Furthermore, the rotor magnet 122 includes two rotor magnetic poles 1221 arranged symmetrically along the axis. The rotor magnetic poles 1221 are arranged in a spiral twist. The two rotor magnetic poles 1221 are spliced ​​together circumferentially to form a cylindrical structure. The rotor sheath 121 is fitted onto the cylindrical structure. One rotor magnetic pole 1221 is the N pole and the other rotor magnetic pole 1221 is the S pole. The rotor sleeve 121 has an open inclined groove 1211 on its circumferential wall. The open inclined groove 1211 extends in a spiral shape. The open inclined groove 1211 can reduce the cogging torque and reduce the torque pulsation of the motor 100. The air gap 13 transitions smoothly at the groove. This setting is conducive to further optimization of the air gap magnetic flux density waveform, making it closer to a sine wave. It reduces the noise decibel value of the existing motor 100 and the motor 100, and can improve the air gap magnetic flux density and back electromotive force waveform to the greatest extent. At the same time, the rotor magnet 122 includes a magnet N pole and a magnet S pole. The interface between the two magnets is the magnetic pole splicing surface. The spiral direction of the magnetic pole splicing line 1222 is opposite to the spiral of the open inclined groove 1211, and the magnetic pole splicing line 1222 is aligned with the spiral center line of the open inclined groove 1211, which can improve the air gap magnetic flux density and back electromotive force waveform to the greatest extent.

[0039] Furthermore, to facilitate the arrangement of the open inclined slots 1211, the open inclined slots 1211 extend through the rotor sleeve 121 along the helical direction to both axial ends. The two open inclined slots 1211 are arranged symmetrically along the axis, and the open inclined slots 1211 and the magnetic pole splicing lines 1222 of the rotor magnets 122 are arranged radially aligned. Specifically, the dividing lines of the rotor magnets 122 are distributed on the plane formed by the center lines of the open inclined slots 1211 on the corresponding rotor sleeves 121.

[0040] Furthermore, the helix angle of the magnetic pole splicing line 1222 is no greater than 10 degrees. More preferably, to balance fluctuations and performance, the helix angle of the magnetic pole splicing line 1222 is 5 degrees.

[0041] Furthermore, the open straight groove 114 is a gradually expanding U-shaped groove with its diameter gradually increasing radially inward.

[0042] Furthermore, in order to facilitate the arrangement of the opening slots, the opening straight slot 114 extends axially and penetrates to both ends of the rotor sheath 121.

[0043] Furthermore, 12 stator teeth 112 are evenly spaced along the circumference on the inner circumferential wall of the stator 111.

[0044] Furthermore, the open inclined slot 1211 and the outer surface of the rotor sheath 121 are smoothly transitioned by rounded corners.

[0045] In a specific embodiment of this utility model, the stator-rotor structure 10 for an electric booster includes a stator 11 and a rotor 12 arranged coaxially, with an air gap 13 between the rotor 12 and the stator 11. The stator 11 includes stator ferrules 111, stator teeth 112, and stator pole shoes 113. Multiple stator teeth 112 are arranged circumferentially at intervals on the inner circumferential wall of the stator ferrules 111. The stator teeth 112 extend radially inward, and the inner ends are provided with stator pole shoes 113. The rotor 12 includes a rotor sleeve 121 and a rotor magnet 122. The rotor sleeve 121 is coaxially sleeved on the rotor magnet 122. The side wall of the stator pole shoe 113 away from the stator teeth 112 has an open straight groove 114. The outer circumferential wall of the rotor sleeve 121 has an inner groove 114. The concave opening inclined slot 1211 extends spirally. The rotor magnet 122 includes two rotor magnetic poles 1221 arranged symmetrically along the axis. The rotor magnetic poles 1221 are spirally twisted. The two rotor magnetic poles 1221 are spliced ​​together circumferentially to form a cylindrical structure. The rotor sheath 121 is fitted on the cylindrical structure. One rotor magnetic pole 1221 is the N pole and the other rotor magnetic pole 1221 is the S pole. The opening inclined slot 1211 extends spirally to both ends of the rotor sheath 121. The two opening inclined slots 1211 are arranged symmetrically along the axis. The splicing line 1222 of the opening inclined slot 1211 and the magnetic pole of the rotor magnet 122 is aligned radially. The spiral angle of the splicing line 1222 is 5 degrees. In this invention, by arranging the open inclined slots 1211, the spatial volume of the air gap 13 between the rotor and the corresponding stator gradually changes within the arcuate cross-section corresponding to a stator magnetic pole as the spiral slots gradually rotate out and into the stator magnetic pole. The stator 11 is an important component of the magnetic circuit of the motor 100. It, together with the rotor core and the air gap 13 between the stator and rotor, forms the complete magnetic circuit of the motor 100. The stator pole shoes 113 have slots at their inner ends, the rotor sleeve 121 has inclined slots on its outer circumferential wall, and the magnets have inclined poles. The three elements work together to reduce the air gap magnetic flux density and back electromotive force distortion, thereby reducing the torque pulsation and operating vibration noise of the motor 100.

[0046] Please refer to Figure 8 and Figure 9 As can be seen from the comparison between the existing technology and the cogging torque of the motor 100 in the present invention, after applying the solution of this application, the cogging torque of the motor 100 is reduced from 835 mNm to 764 mNm, which reduces the existing motor 100 and improves the performance of the motor 100.

[0047] Please refer to Figure 10The present invention also provides an electric motor 100, including a body 20 and the stator and rotor structure 10 for an electric booster described above. The body 20 is provided with a receiving cavity. The rotor 12 is arranged along the shaft and rotatably supported on the body 20. The stator 11 is fixed on the body 20 and located outside the rotor 12. The stator 11 and the rotor 12 are arranged radially opposite each other.

[0048] The above embodiments are merely illustrative of several implementation methods of this application, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A stator-rotor structure for an electric supercharger, comprising a stator and a rotor arranged coaxially, wherein an air gap is provided between the rotor and the stator, characterized in that, The stator includes a stator housing, stator teeth, and stator pole shoes. A plurality of stator teeth are arranged circumferentially at intervals on the inner circumferential wall of the stator housing. Each stator tooth extends radially inward, with the stator pole shoe located at its inner end. The rotor includes a rotor sleeve and a rotor magnet, the rotor sleeve being coaxially fitted onto the rotor magnet. The stator pole shoe has an open straight groove on the side wall away from the stator teeth, and the rotor sheath has an inwardly recessed open oblique groove on the outer circumferential wall, the open oblique groove extending in a spiral shape.

2. The stator and rotor structure for an electric supercharger according to claim 1, characterized in that, The rotor magnet includes two rotor poles symmetrically arranged along the axis. The rotor poles are arranged in a spiral twist, and the two rotor poles are spliced ​​together circumferentially to form a cylindrical structure. The rotor sheath is fitted onto the cylindrical structure. One of the rotor magnets is the N pole, and the other rotor magnet is the S pole.

3. The stator and rotor structure for an electric turbocharger according to claim 1, characterized in that, The open inclined slot extends along the helical direction to both axial ends of the rotor sleeve, and the two open inclined slots are arranged symmetrically along the axis. The open inclined slot and the magnetic pole splicing line of the rotor magnet are arranged radially aligned.

4. The stator and rotor structure for an electric supercharger according to claim 1, characterized in that, The helix angle of the magnetic pole splicing line is no greater than 10 degrees.

5. The stator and rotor structure for an electric supercharger according to claim 1, characterized in that, The helix angle of the magnetic pole splicing line is 5 degrees.

6. The stator and rotor structure for an electric supercharger according to any one of claims 1 to 5, characterized in that, The open straight groove is a gradually expanding U-shaped groove whose diameter gradually increases radially inward.

7. The stator and rotor structure for an electric supercharger according to claim 1, characterized in that, The open straight groove extends axially and penetrates to both ends of the rotor sheath.

8. The stator and rotor structure for an electric supercharger according to claim 1, characterized in that, The 12 stator teeth are evenly spaced along the circumference of the inner wall of the stator.

9. An electric machine characterized by Includes a body and a stator / rotor structure for an electric supercharger as described in any one of claims 1 to 8, wherein the body is provided with a receiving cavity. The rotor is arranged along the shaft and rotatably supported on the body, the stator is fixed on the body and located outside the rotor, and the stator and the rotor are arranged radially opposite each other.

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