Mounting piece for motor rotor and motor rotor

Abstract

The utility model discloses a mounting part for a motor rotor and the motor rotor, and relates to the technical field of motor rotors, the mounting part comprises a base and a limiting part, the limiting part is arranged on the base, the limiting part comprises a center ring and a plurality of limiting strips, and the limiting strips surround the center ring and are arranged on the periphery of the center ring; a plurality of first mounting grooves and a plurality of second mounting grooves are formed, the first mounting grooves and the second mounting grooves are alternately distributed in the circumferential direction, the first mounting grooves are used for mounting rotor iron core blocks, and the second mounting grooves are used for mounting magnetic steel. By using the mounting piece, the positions of the rotor iron core blocks and the magnetic steel can be better fixed, the mounting precision is improved, the mounting difficulty is reduced, and the contact between the rotor iron core blocks and the rotating shaft piece can be avoided, so that the problem of high magnetic leakage coefficient of a tangential rotor is solved, meanwhile, the heat conduction effect can be better realized, the temperature rise of the rotor is reduced, and the service life of the rotor is prolonged. In addition, the use of the mounting parts is beneficial to the design requirements of light weight and economization of the whole machine.

Description

Technical Field

[0001] The present application relates to the technical field of motor rotors, and in particular to a mounting member for a motor rotor. The present application also relates to a motor rotor having the mounting member. Background Art

[0002] At present, permanent magnet synchronous motors have been widely used in electric doors, electric seats, air conditioners and other mechanisms of automobiles due to their small size, high speed, high power density, and flexible and diverse shapes and sizes.

[0003] In the existing system, the motor rotor of the permanent magnet synchronous motor includes a rotor core, a magnetic steel and a rotating shaft, etc. Specifically, the rotor core is evenly provided with magnetic steel installation grooves, the magnetic steel is installed in the magnetic steel installation grooves, and the rotor core is also provided with an axial hole, and the rotating shaft is installed in the axial hole.

[0004] In the process of implementing the utility model, the inventors found that there are at least the following problems in the prior art:

[0005] Due to the special operating environment of automotive permanent magnet synchronous motors, such as frequent starting, stopping, acceleration, deceleration and other harsh conditions, higher requirements are placed on the treatment of motor loss, vibration and noise problems. However, the current motor rotor assembly precision is low, the thermal conductivity is poor, and the magnetic leakage coefficient is large, which makes it difficult to improve the motor loss, vibration and noise problems, and ultimately cannot meet the current application requirements of permanent magnet synchronous motors.

[0006] Therefore, it is necessary for those skilled in the art to provide a mounting component that can achieve high motor rotor assembly accuracy, good thermal conductivity and low magnetic leakage coefficient. Utility Model Content

[0007] The purpose of the present application is to provide a mounting member for a motor rotor, which can ensure high assembly accuracy of the motor rotor, good thermal conductivity and low magnetic flux leakage coefficient. Another purpose of the present application is to provide a motor rotor including the above-mentioned mounting member.

[0008] To achieve the above-mentioned purpose, the present application provides a mounting member for a motor rotor, comprising a base and a limiting member arranged on the base;

[0009] The limiting member includes a center ring and a plurality of limiting strips surrounding the center ring and arranged at the periphery of the center ring to form a plurality of first mounting grooves and a plurality of second mounting grooves, and the first mounting grooves and the second mounting grooves are alternately distributed in the circumferential direction;

[0010] The first installation groove is used to install the rotor core blocks, and the second installation groove is used to install the magnetic steel.

[0011] In some embodiments, the center ring includes a plurality of second outer walls arranged outward in the circumferential direction, and the limiting strips on both sides corresponding to any second installation groove are arranged on a side of the second outer wall away from the center ring.

[0012] In some embodiments, the thickness of the limiting strip on one side corresponding to any second installation slot gradually decreases in a direction approaching the second outer wall, and the thickness of the limiting strip on the other side gradually decreases in a direction away from the second outer wall.

[0013] In some embodiments, a guide slot is provided on a side of any second mounting slot away from the base, and the width of the guide slot gradually decreases in a direction approaching the base so that the magnet can be installed into the second mounting slot along the axial direction of the limiting member.

[0014] In some embodiments, the base and the limiting member are integrally injection molded structures.

[0015] In some embodiments, the center ring and the limiting strip are integrally injection molded structures.

[0016] The present application also provides a motor rotor, comprising a plurality of rotor core blocks and a plurality of magnets, and also comprising any of the above-mentioned mounting parts for the motor rotor, the mounting parts being used to mount each rotor core block and each magnet so that each rotor core block and each magnet are alternately distributed circumferentially.

[0017] In some embodiments, any rotor core block is formed by stacking a plurality of silicon steel sheets, and a rib is extended along both sides of the outer end of any rotor core block to prevent the magnetic steel from escaping from the second mounting groove.

[0018] In some embodiments, any rotor core block is provided with an axial through hole, and the cross-section of the axial through hole is a polygon.

[0019] Compared with the above background technology, the mounting member provided in the embodiment of the present application is used for the motor rotor, and the mounting member includes a base and a limiter, and the limiter is arranged on the base. Further, the limiter includes a center ring and a plurality of limiter bars, and the plurality of limiter bars surround the center ring and are arranged on the periphery of the center ring to form a plurality of first mounting grooves and a plurality of second mounting grooves, and the first mounting grooves and the second mounting grooves are alternately distributed along the circumferential direction, wherein the first mounting grooves are used to install the rotor core blocks, and the second mounting grooves are used to install the magnetic steel.

[0020] In this way, the rotor core blocks of the rotor core are distributed along the circumferential direction and are independently arranged, and a magnetic steel is arranged between any two adjacent rotor core blocks, so that the rotor core blocks and the magnetic steels are distributed along the circumferential direction and alternately on the outer periphery of the center ring. Compared with the traditional arrangement, the above-mentioned mounting parts have the following beneficial effects:

[0021] First, the mounting parts can better fix the positions of the rotor core blocks and magnetic steel, improve the installation accuracy and reduce the installation difficulty;

[0022] Secondly, the rotating shaft is installed in the center ring of the mounting member, and each rotor core block is installed on the outer periphery of the center ring. In this way, the use of the mounting member can avoid the contact between the rotor core block and the rotating shaft, solving the problem of high magnetic leakage coefficient of the tangential rotor;

[0023] Third, the use of mounting parts can better achieve the heat conduction effect and reduce the temperature rise of the rotor, so that the rotor in a sealed environment has a better working environment, thereby increasing the service life and operating range of the motor;

[0024] Fourthly, the use of mounting parts can not only better adjust the moment of inertia, but also reduce the amount of rotor core material used, which is beneficial to the design requirements of lightweight and economical whole machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0026] Figure 1 This is a schematic diagram of the overall structure of the mounting member in the embodiment of the present application;

[0027] Figure 2 for Figure 1 A schematic diagram of the mounting member at a first angle shown;

[0028] Figure 3 for Figure 1 A second angle schematic diagram of the mounting member shown;

[0029] Figure 4 This is a schematic diagram of the distribution of rotor core blocks in an embodiment of the present application;

[0030] Figure 5 for Figure 4 A top view of

[0031] Figure 6 This is a schematic diagram of the assembly of the rotor core blocks and mounting parts of the embodiment of the present application;

[0032] Figure 7 for Figure 6 The main view;

[0033] Figure 8 This is a schematic diagram of the distribution of magnetic steel in the embodiment of the present application;

[0034] Fig. 9 This is a schematic diagram of the overall structure of the motor rotor in the embodiment of the present application;

[0035] Fig.10 for Fig. 9 A first angle schematic diagram of the motor rotor shown;

[0036] Fig.11 for Fig. 9 A second angle schematic diagram of the motor rotor shown;

[0037] Fig.12 Schematic diagram of the skew angle of the motor rotor in the embodiment of the present application.

[0038] in:

[0039] 1-Mounting parts;

[0040] 11-limiting member, 111-center ring, 1111-first outer wall, 1112-second outer wall, 112-limiting strip, 113-first mounting groove, 114-second mounting groove, 115-guide groove;

[0041] 12-base, 121-bottom plate, 122-annular protrusion;

[0042] 2- rotor core blocks, 21- ribs, 22- axial through holes;

[0043] 3-Magnetic steel. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0045] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0046] It should be noted that the directional words such as "upper end, lower end, left side, right side" described below are all defined based on the drawings in the specification.

[0047] See also Figure 1 and Figure 2 The mounting member 1 provided in the embodiment of the present application is used for a motor rotor. The mounting member 1 includes a base 12 and a limiting member 11 , and the limiting member 11 is arranged on the base 12 .

[0048] The limiting member 11 includes a center ring 111 and a plurality of limiting strips 112 . The plurality of limiting strips 112 surround the center ring 111 and are disposed on the periphery of the center ring 111 to form a plurality of first mounting grooves 113 and a plurality of second mounting grooves 114 . The first mounting grooves 113 and the second mounting grooves 114 are alternately distributed along the circumferential direction.

[0049] The first installation groove 113 is used to install the rotor core block 2 , and the second installation groove 114 is used to install the magnetic steel 3 .

[0050] Please also read Figure 3 The base 12 includes a bottom plate 121 and an annular protrusion 122. The stopper 11 is arranged on one side of the bottom plate 121, and the annular protrusion 122 is arranged on the other side of the bottom plate 121, that is, the annular protrusion 122 protrudes along the side away from the center ring 111, and the annular protrusion 122 and the center ring 111 are coaxially arranged to facilitate the installation of the rotating shaft.

[0051] Please also read Figure 4 and Figure 5 The rotor core includes a plurality of rotor core blocks 2 distributed along the circumferential direction. Any rotor core block 2 is formed by stacking a plurality of silicon steel sheets. A rib 21 is extended along both sides of the outer end of any rotor core block 2. The rib 21 is configured to prevent the magnetic steel 3 from escaping from the second mounting groove 114.

[0052] In addition, any rotor core block 2 is provided with an axial through hole 22, and the cross section of the axial through hole 22 is a polygon. The provision of the axial through hole 22 can not only enhance the magnetic field and adjust the moment of inertia, but also reduce the weight of the rotor to meet the lightweight design requirements.

[0053] Please also read Figure 6 and Figure 7 During assembly, first assemble each rotor core block 2 with the mounting member 1 , and then insert each magnetic steel 3 into the mounting member 1 .

[0054] Please also read Figure 8 , the magnetic steels 3 are distributed at intervals along the circumferential direction.

[0055] Please also read Fig. 9 After each rotor core block 2 and each magnetic steel 3 are installed in the mounting part 1, each rotor core block 2 is distributed along the circumferential direction and is independently arranged, and a magnetic steel 3 is arranged between any two adjacent rotor core blocks 2, so that each rotor core block 2 and each magnetic steel 3 are distributed along the circumferential direction and alternately on the outer periphery of the center ring 111.

[0056] Compared with the traditional setting, the mounting member 1 provided in the embodiment of the present application is used to mount the rotor core blocks 2 and the magnetic steel 3. The mounting member 1 can better fix the positions of the rotor core blocks 2 and the magnetic steel 3, improve the installation accuracy and reduce the installation difficulty; the rotating shaft member is installed in the center ring 111 of the mounting member 1, and each rotor core block 2 is installed on the outer periphery of the center ring 111. In this way, the use of the mounting member 1 can avoid the contact between each rotor core block 2 and the rotating shaft member, thereby solving the problem of high magnetic leakage coefficient of the tangential rotor; at the same time, the use of the mounting member 1 can better achieve the heat conduction effect and reduce the temperature rise of the rotor, so that the rotor in a sealed environment has a better working environment, thereby improving the service life and operating range of the motor; in addition, the use of the mounting member 1 can not only better adjust the moment of inertia, but also reduce the amount of rotor core material used, which is beneficial to the design requirements of lightweight and economical whole machine.

[0057] In some embodiments, the mounting member 1 is an integral injection-molded structure, that is, the base 12 and the stopper 11 are combined to form a structure that is an integral injection-molded structure.

[0058] It should be noted that the material of the mounting member 1 is preferably a material with good thermal conductivity, so that the mounting member 1 has a good thermal conductivity effect, thereby reducing the temperature rise of the rotor during the operation of the rotor.

[0059] For example, the mounting member 1 may be made of BMC (BMC is the abbreviation of Bulk Molding Compound in English, and its Chinese name is bulk molding compound) material.

[0060] On the basis of the above, the limiting member 11 is an integral injection-molded structure, that is, the overall structure formed by the combination of the center ring 111 and the limiting strip 112 is an integral injection-molded structure.

[0061] The above-mentioned production method using integrated injection molding can improve production efficiency, and the selected materials are preferably materials with good thermal conductivity, which can improve the overall heat dissipation effect of the motor rotor.

[0062] In some embodiments, please refer to Figure 2 The center ring 111 includes a plurality of first outer walls 1111 spaced apart along the circumferential direction, and the limiting strips 112 on both sides corresponding to any first outer wall 1111 are arranged on the side of the first outer wall 1111 away from the center ring 111 .

[0063] In this embodiment, the limiting strips 112 on both sides corresponding to any first outer wall 1111 can be symmetrically distributed about the central axis of the first outer wall 1111, and any first outer wall 1111 and the limiting strips 112 on both sides form a first installation groove 113 for installing the rotor core block 2.

[0064] In some embodiments, the center ring 111 also includes a plurality of second outer walls 1112 arranged circumferentially outward, each first outer wall 1111 and the plurality of second outer walls 1112 are alternately distributed along the circumferential direction, and the limiting strips 112 on both sides corresponding to any second installation groove 114 are arranged on the side of the second outer wall 1112 away from the center ring 111.

[0065] Among them, any second outer wall 1112 and the limiting strips 112 on both sides thereof form a second installation groove 114 for installing the magnetic steel 3.

[0066] In this embodiment, the thickness of the limiting strip 112 on one side corresponding to any second installation groove 114 gradually decreases in a direction approaching the second outer wall 1112 , and the thickness of the limiting strip 112 on the other side gradually decreases in a direction away from the second outer wall 1112 .

[0067] In this way, when the magnetic steel is installed in the corresponding second installation slot 114 , it has a preset tilt angle.

[0068] It should be noted that the structure and size of any of the above-mentioned first mounting grooves 113 can be adjusted according to the structure and size of the rotor core block 2 to install the rotor core block 2; the structure and size of any of the second mounting grooves 114 can be adjusted according to the structure and size of the magnet 3 to install the magnet 3.

[0069] For example, the first installation groove 113 is a fan-shaped groove, and the second installation groove 114 is a rectangular groove.

[0070] It should be noted that the second mounting grooves 114 on both sides of any first mounting groove 113 are symmetrically arranged with respect to the central axis of the first mounting groove 113 .

[0071] In some embodiments, in order to facilitate the installation of the magnet 3, a guide slot 115 is provided on the side of any second installation slot 114 away from the base 12, and the width of the guide slot 115 gradually decreases in the direction close to the base 12 so that the magnet 3 can be installed in the second installation slot 114 along the axial direction of the limit member 11.

[0072] An open or trumpet-shaped guide slot 115 is provided on a side of the second mounting slot 114 away from the base 12 , so that when the magnet 3 is installed, it is convenient for the magnet 3 to be quickly and accurately installed into the second mounting slot 114 , which can greatly improve the installation efficiency of the magnet 3 .

[0073] Please also read Fig.10 and Fig.11 The motor rotor provided in the embodiment of the present application includes a rotor core and a plurality of magnetic steels 3. The rotor core includes a plurality of rotor core blocks 2. The motor rotor also includes the mounting member 1 described in the above embodiment.

[0074] The mounting member 1 is used to mount the rotor core blocks 2 and the magnetic steels 3 so that the rotor core blocks 2 and the magnetic steels 3 are alternately distributed along the circumferential direction.

[0075] During assembly, first assemble each rotor core block 2 with the mounting member 1 , and then insert each magnetic steel 3 into the mounting member 1 .

[0076] The center ring 111 on the limiter 11 and the annular protrusion 122 on the base 12 are used to install the shaft. In order to ensure that there is no contact between the rotor core blocks 2 and the shaft, the inner diameter of the rotor core composed of multiple rotor core blocks 2 should be larger than the outer diameter of the shaft.

[0077] It can be seen that the rotor core blocks 2 of the rotor core are distributed along the circumferential direction and are independently arranged, and a magnet 3 is provided between any two adjacent rotor core blocks 2, so that the rotor core blocks 2 and the magnets 3 are distributed along the circumferential direction and alternately on the outer periphery of the center ring 111 of the limit member 11.

[0078] In some embodiments, any rotor core block 2 is formed by stacking multiple silicon steel sheets, and a rib 21 extends from the outer end of any rotor core block 2 along both sides. The rib 21 is configured to prevent the magnetic steel 3 from escaping from the second mounting groove 114.

[0079] It is understandable that after the magnet 3 is installed into the second mounting groove 114 along the axial direction of the mounting member 1 , the two ribs 21 abut against the end of the magnet 3 away from the center ring 111 , thereby preventing the magnet 3 from escaping from the second mounting groove 114 .

[0080] In some embodiments, any rotor core block 2 is provided with an axial through hole 22 , and the cross section of the axial through hole 22 is a polygon.

[0081] In this embodiment, the provision of the axial through hole 22 can not only enhance the magnetic field and adjust the moment of inertia, but also reduce the weight of the rotor, thus meeting the lightweight design requirements.

[0082] In addition, in the motor rotor provided in the embodiment of the present application, each magnetic steel 3 has a preset skew angle after being installed in the corresponding second installation slot 114. At the same time, the magnetic steels 3 on both sides of any rotor core block 2 are symmetrically arranged about the radial axis of the rotor core block 2.

[0083] Please also read Fig.12 , the skew angle α of the magnetic steel 3 should satisfy that α is equal to half of the least common multiple of the number of slot poles.

[0084] It should be noted that in order to reduce tooth harmonics, harmonic torque and vibration noise, the second mounting slot 114 is often made into a skewed slot structure, that is, after each magnetic steel 3 is installed in the corresponding second mounting slot 114, each magnetic steel 3 is twisted at an overall angle. This structural form is called skewed pole or skewed slot. The skewed pole or skewed slot makes the tooth harmonics of the winding different in phase, offsets a part and thus weakens the tooth harmonics.

[0085] The purpose of this application is to provide a tangentially skewed pole motor rotor structure, which can effectively improve power density, reduce the amount of permanent magnets used, save costs, reduce cogging torque, motor losses, noise and vibration, etc.; improve the sinusoidal nature of the motor back EMF, reduce its harmonic content, and has extremely high process feasibility.

[0086] It is understandable that in order to achieve a higher winding slot fill rate, the armature core usually uses an open slot structure, which will cause cogging. The existence of cogging causes uneven air gap magnetic field, and the magnetic lines of force always tend to take the path with small magnetic resistance. After the stator is slotted, the magnetic resistance of the magnetic circuit corresponding to each pole of the motor is unbalanced, and the magnetic lines of force pull the rotor to the position with the smallest magnetic resistance path. The interaction between the permanent magnet magnetic field of the rotor and the teeth of the stator produces cogging torque. Due to the existence of cogging torque, the motor rotor always tends to stay in a fixed position, so it will affect the control accuracy of the motor. Secondly, cogging torque is a periodic torque fluctuation, which will cause additional torque fluctuations, and fluctuations will generate noise, which will also affect the noise of the motor. Based on this, the oblique pole part in the tangential oblique pole motor rotor structure adopted in this application can effectively reduce the amplitude of each harmonic of the motor electromagnetic torque, thereby reducing the electromagnetic noise vibration of the motor and weakening the motor torque pulsation; the tangential part in the tangential oblique pole structure can achieve a better magnetic field concentration effect, reduce the amount of permanent magnets to achieve better cost reduction; at the same time, due to the characteristics of the tangential structure, it can also reduce the component of some harmonics, and make a certain contribution to the optimization of cogging torque, torque pulsation and other performance aspects. The part of the tangential rotor structure can refer to the existing technology, and will not be expanded here one by one.

[0087] In summary, the present application effectively integrates the tangential rotor structure and the skewed pole rotor structure, thereby utilizing the existing tangential structure to achieve a better magnetic field concentration effect, reduce the amount of permanent magnets used, and achieve cost reduction and efficiency improvement. At the same time, due to the presence of the skewed pole, the harmonic components can be better reduced, and the cogging torque, back electromotive force distortion rate, and torque pulsation can be effectively reduced.

[0088] In addition, the presence of the mounting member 1 can not only better adjust the moment of inertia, but also reduce the material consumption of the rotor core; the presence of the mounting member 1 can avoid contact between the rotor core and the rotating shaft, thereby reducing the disadvantage of the high magnetic leakage coefficient of the tangential scheme; at the same time, the mounting member 1 can achieve better thermal conductivity, so that the rotor in a sealed environment has a better working environment, which can increase the service life and operating range of the motor; the presence of the mounting member 1 can also better fix the position of the rotor core block 2 and the magnetic steel 3, improve the process accuracy and reduce the process difficulty.

[0089] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0090] The above is a detailed introduction to the mounting parts for the motor rotor and the motor rotor provided by the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the scheme of the present application and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A mounting member for a motor rotor, characterized in that: It comprises a base and a limiting member arranged on the base; The limiting member includes a center ring and a plurality of limiting strips surrounding the center ring and arranged at the periphery of the center ring to form a plurality of first mounting grooves and a plurality of second mounting grooves, and the first mounting grooves and the second mounting grooves are alternately distributed in the circumferential direction; Wherein, the first installation groove is used to install the rotor core block, and the second installation groove is used to install the magnetic steel.

2. The mounting member according to claim 1, characterized in that The center ring includes a plurality of second outer walls arranged outward in the circumferential direction, and the limiting strips on both sides corresponding to any second installation groove are arranged on a side of the second outer wall away from the center ring.

3. The mounting member according to claim 2, characterized in that The thickness of the limiting strip on one side corresponding to any one of the second installation grooves gradually decreases in a direction approaching the second outer wall, and the thickness of the limiting strip on the other side gradually decreases in a direction away from the second outer wall.

4. The mounting member according to claim 1, characterized in that A guide slot is provided on one side of any second mounting slot away from the base, and the width of the guide slot gradually decreases in a direction approaching the base so that the magnetic steel can be installed into the second mounting slot along the axial direction of the limiting member.

5. The mounting member according to any one of claims 1 to 4, characterized in that: The base and the limiting member are integrally injection-molded structures.

6. The mounting member according to claim 5, characterized in that The center ring and the limiting strip are integrally injection-molded structures.

7. A motor rotor, comprising a plurality of rotor core blocks and a plurality of magnetic steels, characterized in that: It also includes a mounting member as described in any one of claims 1 to 6, wherein the mounting member is used to mount each of the rotor core blocks and each of the magnetic steels so that each of the rotor core blocks and each of the magnetic steels are alternately distributed circumferentially.

8. The motor rotor according to claim 7, characterized in that: Any of the rotor core blocks is formed by stacking a plurality of silicon steel sheets, and a rib is extended along both sides of the outer end of any of the rotor core blocks to prevent the magnetic steel from escaping from the second mounting groove.

9. The motor rotor according to claim 7, characterized in that: Any of the rotor core blocks is provided with an axial through hole, and the cross section of the axial through hole is a polygon.

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