Built-in rotor punching sheet, rotor and motor

Abstract

The invention provides a built-in rotor punching sheet, a rotor and a motor, relates to the technical field of motors, and solves the technical problem of low motor operation efficiency in the prior art. According to the built-in rotor punching sheet, the rotor and the motor, a plurality of magnetic poles are formed on the rotor punching sheet, and the plurality of magnetic poles are sequentially arranged along the circumferential direction of the rotor punching sheet; a spacing groove is arranged between two adjacent magnetic poles on the rotor punching sheet; sensitization bosses are arranged in the interval grooves, and the sensitization bosses are arranged in the direction away from the center of the rotor punching sheet. According to the built-in rotor punching sheet, the rotor and the motor, the operation noise of the motor is reduced, and the efficiency of the motor is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to an embedded rotor punching sheet, a rotor and a motor. Background Art

[0002] Permanent magnet synchronous motors are widely used in many fields due to their advantages such as large torque density, high efficiency, good steady-state performance and high reliability. In existing permanent magnet synchronous motors, the structural design of the rotor punching sheet and the magnetic circuit structure design of the motor rotor are unreasonable, resulting in problems such as high amplitude, low smoothness, low motor efficiency and high noise during motor operation. Summary of the Invention

[0003] The purpose of the present invention is to provide an embedded rotor punching sheet, a rotor and a motor to solve the technical problem of low motor operation efficiency existing in the prior art. The many technical effects that can be produced by the preferred technical solutions provided by the present invention are described in detail below.

[0004] To achieve the above purpose, the present invention provides the following technical solutions:

[0005] The embedded rotor punching sheet provided by the present invention forms a plurality of magnetic poles, and the plurality of magnetic poles are arranged in sequence along the circumferential direction of the rotor punching sheet;

[0006] An interval groove is provided between two adjacent magnetic poles on the rotor punching sheet, and a sense enhancement boss is provided in the interval groove, and the sense enhancement boss is arranged in a direction away from the center of the rotor punching sheet.

[0007] Preferably, a noise reduction groove structure is provided on the outer wall of the sense enhancement boss.

[0008] Preferably, the noise reduction groove structure is symmetrically arranged on both side walls of the sense enhancement boss with the Q-axis of the rotor punching sheet as the axis of symmetry.

[0009] Preferably, there are two groups of the noise reduction groove structures, namely a first semi-circular noise reduction groove and a second semi-circular noise reduction groove, and the first semi-circular noise reduction groove and the second semi-circular noise reduction groove are arranged in parallel.

[0010] Preferably, the second semi-circular noise reduction groove is arranged on the side close to the center of the rotor punching sheet, the radius of the first semi-circular noise reduction groove is R1, the radius of the second semi-circular noise reduction groove is R2, and R2 = 2*R1.

[0011] Preferably, the distance between the sense enhancement boss and the bottom surface of the interval groove is C1, the distance between the center of the second semi-circular noise reduction groove and the bottom surface of the interval groove is C2, and 0.26 ≤ C2 / C1 < 0.3.

[0012] Preferably, the maximum distance between the intensifying boss and the center of the rotor punching is not greater than the radius of the rotor punching.

[0013] Preferably, the spaced grooves are symmetrically arranged in the Q-axis direction between two adjacent magnetic poles, and the bottom surface of the spaced grooves is an arc surface concentric with the outer circle of the rotor punching.

[0014] Preferably, each of the magnetic poles is provided with a magnet slot;

[0015] A magnetic isolation bridge is arranged between two adjacent magnet slots, and the width of the intensifying boss is the same as the width of the magnetic isolation bridge.

[0016] Preferably, on the outer circle of the rotor of the rotor punching between two adjacent spaced grooves, second arc segments are symmetrically arranged with respect to the D-axis of the rotor punching, and the second arc segments are recessed toward the center of the rotor punching.

[0017] Preferably, the second arc segments divide the outer circle of the rotor between two adjacent spaced grooves into a central arc segment and two third arc segments. The central arc segment is connected between two adjacent second arc segments and is symmetrically arranged with respect to the D-axis of the rotor punching. The two third arc segments are respectively connected between the two second arc segments and the two spaced grooves.

[0018] Preferably, the arc length of the outer circle of the rotor of the rotor punching between two adjacent spaced grooves is B1, the arc length of the central arc segment is B2, and 0.38 < B2 / B1 < 0.42;

[0019] And / or, the arc angle of the second arc segment is B3, the arc angle of the third arc segment is B4, and the arc angle of the bottom surface of the spaced groove is B5, 4.95° ≤ B3 ≤ 5.05°, 6.8° ≤ B4 ≤ 7.2°, 5.6° ≤ B5 ≤ 6°;

[0020] And / or, the vertical distance between the second arc segment and the magnet slot is H2, the distance between the outer circle of the rotor punching and the magnet slot is H1, and 0.73 < H2 / H1 < 0.75;

[0021] And / or, the vertical distance between the connection of the third arc segment and the spaced groove and the magnet slot is H4, and 0.6 mm < H4 < 0.8 mm; the distance between the farthest point of the third arc segment from the center of the rotor and the magnet slot is H3, and 0.46 ≤ H3 / H1 ≤ 0.48;

[0022] And / or, the bottom diameter of the spaced groove is φ2, the outer diameter of the rotor is φ1, and 0.96 < φ2 / φ1 < 0.98.

[0023] A rotor includes a rotor core which is formed by laminating a plurality of the above-described built-in rotor punching sheets.

[0024] An electric motor includes a housing, a stator, and the rotor as described above. The stator is disposed within the housing, and the rotor is disposed within the stator.

[0025] The beneficial effects of the present invention are as follows: For the built-in rotor punching sheet, rotor, and electric motor provided by the present invention, the rotor punching sheet is formed with a plurality of magnetic poles, and the plurality of magnetic poles are sequentially arranged along the circumferential direction of the rotor punching sheet. Spacing grooves are symmetrically arranged in the Q-axis direction between two adjacent magnetic poles. The spacing grooves can improve the utilization rate of the magnets, which is equivalent to increasing the permanent magnet torque. However, this will also cause a decrease in the Q-axis inductance, a decrease in the salient pole ratio between Ld and Lq, and a decrease in the reluctance torque. By providing an inductance-increasing boss in the spacing groove, the inductance-increasing boss is arranged in a direction away from the center of the rotor punching sheet, so that the volume of the soft magnetic material at the Q-axis can be increased, an increase in the magnetic flux linkage at the Q-axis can be achieved, and the Q-axis inductance will also increase, thereby improving the operating torque of the electric motor and reducing the load current to achieve efficiency improvement. Secondly, the arrangement of the inductance-increasing boss can optimize the back electromotive force waveform, torque waveform, and radial electromagnetic force waveform, making the back electromotive force waveform, torque waveform, and radial electromagnetic force waveform more approximate to a sine wave, so that the harmonic content can be reduced, lower noise, vibration, and loss can be achieved, a more stable rotation output can be provided, as well as higher efficiency and accuracy. Description of the Drawings

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0027] Figure 1 is the front view of the built-in rotor punching sheet of the present invention;

[0028] Figure 2 is the partial structural schematic diagram (one) of the built-in rotor punching sheet of the present invention;

[0029] Figure 3 is the partial structural schematic diagram (two) of the built-in rotor punching sheet of the present invention;

[0030] Figure 4 is the structural schematic diagram of the inductance-increasing boss of the present invention;

[0031] Figure 5 is the back electromotive force waveform diagram of the electric motor in Embodiment 1 of the present invention;

[0032] Figure 6It is the torque waveform diagram of the motor in Embodiment 1 of the present invention;

[0033] Figure 7 It is the radial electromagnetic force waveform diagram of the motor in Embodiment 1 of the present invention.

[0034] In the figure:

[0035] 100. Rotor punching; 101. Magnetic pole; 102. Permanent magnet slot; 103. Magnetic isolation bridge; 104. Spacing groove; 105. Rotor outer circle; 106. Second arc segment; 107. Central arc segment; 108. Third arc segment; 109. Sensitivity increasing boss; 110. First semi-circular noise reduction groove; 111. Second semi-circular noise reduction groove. Detailed implementation manners

[0036] The following can refer to the drawings Figures 1 to 7 And the text content to understand the content of the present invention and the differences between the present invention and the prior art. The technical solutions (including preferred technical solutions) of the present invention will be further described in detail below by way of the drawings and by listing some optional embodiments of the present invention. It should be noted that: Any technical feature and any technical solution in this embodiment are one or several of a variety of optional technical features or optional technical solutions. For the sake of concise description, all alternative technical features and alternative technical solutions of the present invention cannot be exhausted in this document, nor is it convenient to emphasize that each implementation manner of each technical feature is one of the optional multiple implementation manners. Therefore, those skilled in the art should know that: Any technical means provided by the present invention can be replaced or any two or more technical means or technical features provided by the present invention can be combined with each other to obtain a new technical solution. Any technical feature and any technical solution within this embodiment do not limit the protection scope of the present invention. The protection scope of the present invention should include any alternative technical solutions that those skilled in the art can think of without creative labor and any new technical solutions obtained by those skilled in the art by combining any two or more technical means or technical features provided by the present invention with each other.

[0037] In the description of the present invention, it should be noted that unless otherwise specified, the meaning of "a plurality of" is two or more; the orientation or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0038] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] The present invention provides an internal rotor punching sheet, a rotor, and a motor for reducing the running noise of the motor and improving the efficiency of the motor.

[0040] Next, in combination with Figures 1 to 7 a more detailed description of the technical solution provided by the present invention will be given.

[0041] The present invention provides an internal rotor punching sheet 100, and a plurality of magnetic poles 101 are formed on the punching sheet 100. The plurality of magnetic poles 101 are arranged in sequence along the circumferential direction of the punching sheet 100.

[0042] On the punching sheet 100, spaced grooves 104 are symmetrically arranged in the Q-axis direction between two adjacent magnetic poles 101. The spaced grooves 104 are symmetrically arranged in the Q-axis direction between two adjacent magnetic poles 101. The bottom surface of the spaced groove 104 is an arc surface concentric with the outer circle of the punching sheet 100, and the radius of the spaced groove 104 is smaller than the radius of the punching sheet 100.

[0043] An intensifying boss 109 is arranged in the spaced groove 104, and the intensifying boss 109 is arranged in a direction away from the center of the punching sheet 100.

[0044] The built-in rotor punching sheet 100 provided by the present invention has a plurality of magnetic poles 101 formed thereon. The plurality of magnetic poles 101 are arranged in sequence along the circumferential direction of the rotor punching sheet 100. Spacing grooves 104 are symmetrically arranged in the Q-axis direction between two adjacent magnetic poles 101. The spacing grooves 104 can improve the utilization rate of magnets, which is equivalent to increasing the permanent magnet torque. However, this will also cause a decrease in the Q-axis inductance, a decrease in the salient pole ratio between Ld and Lq, and a decrease in the reluctance torque. By providing a magnetic flux increasing boss 109 in the spacing groove 104, the magnetic flux increasing boss 109 is arranged in a direction away from the center of the rotor punching sheet 100, so as to increase the volume of the soft magnetic material at the Q-axis, realize an increase in the magnetic flux linkage at the Q-axis, and also increase the Q-axis inductance, thereby improving the motor operation torque and reducing the load current to achieve efficiency improvement. Secondly, the setting of the magnetic flux increasing boss 109 can optimize the back electromotive force waveform, torque waveform, and radial electromagnetic force waveform, making the back electromotive force waveform, torque waveform, and radial electromagnetic force waveform more approximate to a sine wave, so as to reduce the harmonic content, realize lower noise, vibration, and loss, provide a more stable rotation output, as well as higher efficiency and precision.

[0045] It can be understood that, due to the setting of the Q-axis magnetic flux increasing boss 109, the magnetic permeability of air is much smaller than that of the soft magnetic material, reducing the magnetic reluctance of the Q-axis magnetic flux linkage, thereby increasing the Q-axis inductance. The relationship between the magnitude of the salient pole ratio of LdLq and the reluctance torque is directly proportional. The larger the salient pole ratio, the greater the reluctance torque. The torque of the motor = reluctance torque + permanent magnet torque.

[0046] It should be noted that the more sinusoidal the back electromotive force waveform is, the more conducive it is to the precise control of the controller, and the lower the harmonic content is, the more conducive it is to realizing lower vibration noise and loss; the more sinusoidal the rotor waveform is, the lower the torque ripple harmonic content can be reduced, making the motor operation more stable, thereby reducing the loss, vibration, and noise. The quality of the radial electromagnetic force waveform directly affects the electromagnetic noise of the motor. The more sinusoidal the radial electromagnetic force waveform is, the lower the internal harmonic content can be reduced. The electromagnetic force generated by this radial electromagnetic force harmonic will match the inherent vibration frequency of the motor itself, resulting in the occurrence of resonance; resonance will cause the vibration amplitude of the motor to increase sharply, generate greater electromagnetic noise, and seriously affect the normal operation and comfort of the motor.

[0047] In some embodiments of the present invention, a noise reduction groove structure is provided on the outer wall of the magnetic flux increasing boss 109, and the noise reduction groove structure is symmetrically arranged on both side walls of the magnetic flux increasing boss 109 with the Q-axis of the rotor punching sheet as the axis of symmetry.

[0048] In some of the above embodiments of the present invention, by providing a noise reduction groove structure on the side wall of the magnetic flux increasing boss 109, the noise generated by wind resistance can be reduced. If it is a straight design, the wind resistance noise is obvious during motor operation.

[0049] In some embodiments of the present invention, two sets of noise reduction groove structures are provided, namely a first semi-circular noise reduction groove 110 and a second semi-circular noise reduction groove 111, and the first semi-circular noise reduction groove 110 and the second semi-circular noise reduction groove 111 are arranged in parallel.

[0050] In some of the above embodiments of the present invention, a first semi-circular noise reduction groove 110 and a second semi-circular noise reduction groove 111 are provided on the intensifying boss 109. The first semi-circular noise reduction groove 110 and the second semi-circular noise reduction groove 111 are arranged in parallel. Through the first semi-circular noise reduction groove 110 and the second semi-circular noise reduction groove 111, the noise generated by wind resistance can be reduced simultaneously, and the operating efficiency of the motor can be improved.

[0051] It should be noted that the cross-sections of the first semi-circular noise reduction groove 110 and the second semi-circular noise reduction groove 111 are semi-circular structures. The semi-circular noise reduction grooves can facilitate air circulation, so as to better reduce the noise generated by wind resistance and improve the use effect of the motor.

[0052] In some embodiments of the present invention, the second semi-circular noise reduction groove 111 is arranged on the side close to the center of the rotor punching 100. The radius of the first semi-circular noise reduction groove 110 is R1, and the radius of the second semi-circular noise reduction groove 111 is R2, and R2 = 2 * R1.

[0053] In some of the above embodiments of the present invention, the second semi-circular noise reduction groove 111 is arranged on the side close to the center of the rotor punching 100, and the first semi-circular noise reduction groove 110 is arranged on the side far from the center of the rotor punching 100. The radius of the first semi-circular noise reduction groove 110 is R1, and the radius of the second semi-circular noise reduction groove 111 is R2, and R2 = 2 * R1. First, it can ensure that the intensifying boss 109 has better strength; in addition, setting the first semi-circular noise reduction groove 110 and the second semi-circular noise reduction groove 111 to different sizes can better reduce the noise generated by wind resistance and improve the use effect of the motor.

[0054] In some embodiments of the present invention, the distance between the intensifying boss 109 and the bottom surface of the spaced groove 104 is C1, and the distance between the center of the second semi-circular noise reduction groove 111 and the bottom surface of the spaced groove 104 is C2, and 0.26 ≤ C2 / C1 < 0.3.

[0055] In some of the above embodiments of the present invention, the setting position of the second noise reduction groove on the intensifying boss 109 should not be too close to the top of the intensifying boss 109 to avoid affecting the strength of the intensifying boss 109 and secondly avoiding affecting the noise reduction effect of the intensifying boss 109.

[0056] In some embodiments of the present invention, the maximum value of the distance between the intensifying boss 109 and the center of the rotor punching 100 is not greater than the radius of the rotor punching 100.

[0057] In some of the above embodiments of the present invention, the maximum value of the distance between the intensifying boss 109 and the center of the rotor punching 100 refers to the distance between the top surface of the intensifying boss 109 and the center of the rotor punching 100, and this distance is not greater than the radius of the rotor punching 100, so as to avoid affecting the use effect of the rotor punching 100.

[0058] Preferably, the top surface of the intensifying boss 109 is concentric with the outer circle of the rotor punching 100, which makes the maximum value of the distance between the intensifying boss 109 and the center of the rotor punching 100 the same as the radius of the rotor punching 100.

[0059] Preferably, the intensifying boss 109 and the rotor punching 100 are integrally formed.

[0060] In some embodiments of the present invention, a magnetic steel groove 102 is provided on each of the magnetic poles 101;

[0061] A magnetic isolation bridge 103 is provided between two adjacent magnetic steel grooves 102, and the width of the intensifying boss 109 is the same as the width of the magnetic isolation bridge 103.

[0062] In some of the above embodiments of the present invention, the width of the intensifying boss 109 is the same as the width of the magnetic isolation bridge 103, which well balances the utilization rate of the magnet and the Q-axis inductance, so as to optimize the motor waveform and play a role in reducing vibration and noise.

[0063] In some embodiments of the present invention, second arc segments 106 are symmetrically arranged about the D-axis of the rotor punching 100 on the rotor outer circle 105 of the rotor punching 100 between two adjacent spaced grooves 104, and the second arc segments 106 are recessed towards the center of the rotor punching 100;

[0064] The second arc segments 106 divide the rotor outer circle 105 between two adjacent spaced grooves 104 into a central arc segment 107 and two third arc segments 108. The central arc segment 107 is connected between two adjacent second arc segments 106, and the central arc segment 107 is symmetrically arranged about the D-axis of the rotor punching 100. The two third arc segments 108 are respectively connected between the two second arc segments 106 and the two spaced grooves 104.

[0065] In some of the above embodiments of the present invention, a second arc segment 106 is symmetrically arranged on the outer circle 105 of the rotor with respect to the rotor punching sheet 100D, and the second arc segment 106 is recessed toward the center of the rotor punching sheet 100, thereby dividing the outer circle 105 of the rotor into five parts symmetrically arranged with respect to the rotor punching sheet 100D, namely a third arc segment 108, a second arc segment 106, a central arc segment 107, a second arc segment 106, and a third arc segment 108. Moreover, the central arc segment 107, the two third arc segments 108, and the two second arc segments 106 are all symmetrically arranged with respect to the rotor punching sheet 100D. By setting the second arc segment 106, which is recessed toward the center of the rotor punching sheet 100, a rotor outer circle 105 with multiple segments of different bending directions is formed, further improving the magnetic field direction between the stator and the rotor, optimizing the motor waveform, and reducing vibration and noise.

[0066] Under the same inventive concept, the present invention also provides a rotor, including a rotor core, which is formed by laminating a plurality of the above-mentioned built-in rotor punching sheets 100.

[0067] The rotor provided by the present invention includes a rotor core, which is formed by laminating a plurality of the above-mentioned built-in rotor punching sheets 100. This rotor has the beneficial effects that the built-in rotor punching sheet 100 possesses, such as increasing the volume of the soft magnetic material at the Q-axis, realizing an increase in the magnetic flux linkage at the Q-axis, and also increasing the Q-axis inductance, thereby improving the motor operating torque, reducing the load current, and achieving efficiency improvement. At the same time, it also has the beneficial effects of optimizing the back electromotive force waveform, torque waveform, and radial electromagnetic force waveform, making the back electromotive force waveform, torque waveform, and radial electromagnetic force waveform closer to a sine wave, thereby reducing the harmonic content, achieving lower noise, vibration, and loss, providing a more stable rotational output, as well as higher efficiency and accuracy.

[0068] Under the same inventive concept, the present invention also provides a motor, including a housing, a stator, and the above-mentioned rotor. The stator is arranged inside the housing, and the rotor is arranged inside the stator.

[0069] Embodiment 1:

[0070] The built-in rotor punching sheet 100 provided by the present invention has six magnetic poles 101 formed thereon. The six magnetic poles 101 are sequentially arranged along the circumferential direction of the rotor punching sheet 100, and a magnetic steel groove 102 is arranged on each magnetic pole 101; a magnetic isolation bridge 103 is arranged between two adjacent magnetic steel grooves 102.

[0071] Further, on the rotor punching sheet 100, spaced grooves 104 are symmetrically arranged in the Q-axis direction between two adjacent magnetic poles 101. The bottom surface of the spaced groove 104 is an arc surface concentric with the outer circle of the rotor punching sheet 100, and the radius of the bottom surface of the spaced groove 104 is smaller than the radius of the rotor punching sheet 100.

[0072] On the outer rotor circle 105 of the rotor punching sheet 100 between two adjacent spaced grooves 104, second arc segments 106 are symmetrically arranged with respect to the D-axis of the rotor punching sheet 100, and the second arc segments 106 are recessed toward the center of the rotor punching sheet 100;

[0073] The second arc segments 106 divide the outer rotor circle 105 between two adjacent spaced grooves 104 into a central arc segment 107 and two third arc segments 108. The central arc segment 107 is connected between two adjacent second arc segments 106, and the central arc segment 107 is symmetrically arranged with respect to the D-axis of the rotor punching sheet 100. The two third arc segments 108 are connected between the two second arc segments 106 and the two spaced grooves 104.

[0074] Specifically, the arc length of the outer rotor circle 105 of the rotor punching sheet 100 between two adjacent spaced grooves 104 is B1, the arc length of the central arc segment 107 is B2, and 0.38 < B2 / B1 < 0.42;

[0075] The arc angle of the second arc segment 106 is B3, the arc angle of the third arc segment 108 is B4, and the arc angle of the bottom surface of the spaced groove 104 is B5. 4.95° ≤ B3 ≤ 5.05°, 6.8° ≤ B4 ≤ 7.2°, 5.6° ≤ B5 ≤ 6°;

[0076] The perpendicular distance between the second arc segment 106 and the magnet groove 102 is H2, and the distance between the outer circle of the rotor punching sheet 100 and the magnet groove 102 is H1. 0.73 < H2 / H1 < 0.75;

[0077] The perpendicular distance between the connection of the third arc segment 108 and the spaced groove 104 and the magnet groove 102 is H4, and 0.6 mm < H4 < 0.8 mm; the distance between the farthest point of the third arc segment from the rotor center and the magnet groove is H3, and 0.46 ≤ H3 / H1 ≤ 0.48;

[0078] The bottom diameter of the spaced groove 104 is φ2, and the diameter of the outer rotor circle 105 is φ1. 0.96 < φ2 / φ1 < 0.98.

[0079] Furthermore, an intensifying boss 109 is arranged in the spacing groove 104, and the intensifying boss 109 is arranged in a direction away from the center of the rotor punching 100.

[0080] Furthermore, first semi-circular noise reduction grooves 110 and second semi-circular noise reduction grooves 111 are arranged on both side walls of the intensifying boss 109, and the first semi-circular noise reduction grooves 110 and the second semi-circular noise reduction grooves 111 on both side walls of the intensifying boss 109 are symmetrically arranged with respect to the Q-axis of the rotor punching 100.

[0081] Moreover, the first semi-circular noise reduction grooves 110 and the second semi-circular noise reduction grooves 111 are arranged in parallel, the radius of the first semi-circular noise reduction groove 110 is R1, the radius of the second semi-circular noise reduction groove 111 is R2, and R2 = 2*R1.

[0082] Specifically, the distance between the intensifying boss 109 and the bottom surface of the spacing groove 104 is C1, the distance between the center of the second semi-circular noise reduction groove 111 and the bottom surface of the spacing groove 104 is C2, and 0.26 ≤ C2 / C1 < 0.3. And, the width of the intensifying boss 109 is the same as the width of the magnetic isolation bridge 103.

[0083] The present invention also provides a rotor, including a rotor core, and the rotor core is formed by laminating a plurality of the above-mentioned built-in rotor punchings 100.

[0084] The present invention also provides a motor, including a housing, a stator, and the rotor as described above, the stator is arranged in the housing, and the rotor is arranged in the stator.

[0085] In the description of this specification, the description referring to the terms "example", "embodiment" or "some embodiments" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0086] Certainly, the present invention is not limited to the above-mentioned embodiments. Those skilled in the art can also make equivalent deformations or substitutions without departing from the spirit of the present invention, and these equivalent deformations or substitutions are all included in the scope defined by the claims of this application.

Claims

1. An internal rotor punching sheet, characterized in that The rotor punching sheet is formed with a plurality of magnetic poles, and the plurality of magnetic poles are arranged in sequence along the circumferential direction of the rotor punching sheet; An interval groove is arranged between two adjacent magnetic poles on the rotor punching sheet, and a sense-enhancing boss is arranged in the interval groove, and the sense-enhancing boss is arranged in a direction away from the center of the rotor punching sheet.

2. The built-in rotor punching sheet according to claim 1, wherein A noise reduction groove structure is arranged on the side wall of the sense-enhancing boss.

3. The built-in rotor punching sheet according to claim 2, characterized in that, The noise reduction groove structure is symmetrically arranged on both side walls of the sense-enhancing boss with the Q-axis of the rotor punching sheet as the symmetry axis.

4. The built-in rotor punching sheet according to claim 3, characterized in that, There are two groups of the noise reduction groove structures, namely a first semi-circular noise reduction groove and a second semi-circular noise reduction groove, and the first semi-circular noise reduction groove and the second semi-circular noise reduction groove are arranged in parallel.

5. The built-in rotor punching sheet according to claim 4, wherein, The second semi-circular noise reduction groove is arranged on the side close to the center of the rotor punching sheet, the radius of the first semi-circular noise reduction groove is R1, the radius of the second semi-circular noise reduction groove is R2, and R2 = 2 * R1.

6. The built-in rotor punching sheet according to claim 5, wherein The distance between the sense-enhancing boss and the bottom surface of the interval groove is C1, the distance between the center of the second semi-circular noise reduction groove and the bottom surface of the interval groove is C2, and 0.26 ≤ C2 / C1 < 0.

3.

7. The built-in rotor punching sheet according to claim 1, characterized in that, The maximum value of the distance between the sense-enhancing boss and the center of the rotor punching sheet is not greater than the radius of the rotor punching sheet.

8. The built-in rotor punching sheet according to any one of claims 1-7, characterized in that, The interval groove is symmetrically arranged in the Q-axis direction between two adjacent magnetic poles, and the bottom surface of the interval groove is an arc surface concentric with the outer circle of the rotor punching sheet.

9. The built-in rotor punching sheet according to claim 8, characterized in that, A magnetic steel groove is arranged on each of the magnetic poles; A magnetic isolation bridge is arranged between two adjacent magnetic steel grooves, and the width of the sense-enhancing boss is the same as the width of the magnetic isolation bridge.

10. The built-in rotor punching sheet according to claim 9, characterized in that, On the outer circle of the rotor of the rotor punching sheet between two adjacent interval grooves, a second arc segment is symmetrically arranged with the D-axis of the rotor punching sheet, and the second arc segment is recessed in the direction of the center of the rotor punching sheet.

11. The built-in rotor punching sheet according to claim 10, characterized in that, The second arc segment divides the outer circle of the rotor between two adjacent interval grooves into a central arc segment and two third arc segments. The central arc segment is connected between two adjacent second arc segments, and the central arc segment is symmetrically arranged with the D-axis of the rotor punching sheet. The two third arc segments are respectively connected between the two second arc segments and the two interval grooves.

12. The built-in rotor punching sheet according to claim 11, characterized in that, The arc length of the outer circle of the rotor of the rotor punching sheet between two adjacent interval grooves is B1, the arc length of the central arc segment is B2, and 0.38 < B2 / B1 < 0.42; And / or, the arc angle of the second arc segment is B3, the arc angle of the third arc segment is B4, and the arc angle of the bottom surface of the interval groove is B5, 4.95° ≤ B3 ≤ 5.05°, 6.8° ≤ B4 ≤ 7.2°, 5.6° ≤ B5 ≤ 6°; And / or, the vertical distance between the second arc segment and the magnetic steel groove is H2, the distance between the outer circle of the rotor punching sheet and the magnetic steel groove is H1, and 0.73 < H2 / H1 < 0.75; And / or, the vertical distance between the connection of the third arc segment and the interval groove and the magnetic steel groove is H4, and 0.6 mm < H4 < 0.8 mm; the distance between the farthest point of the third arc segment from the center of the rotor and the magnetic steel groove is H3, and 0.46 ≤ H3 / H1 ≤ 0.48; And / or, the bottom surface diameter of the spaced groove is φ2, the outer diameter of the rotor is φ1, and 0.96 < φ2 / φ1 < 0.

98.

13. A rotor, characterized in that, It includes a rotor core, and the rotor core is formed by laminating a plurality of built-in rotor punching sheets as described in any one of claims 1-12.

14. A motor, characterized in that, It includes a housing, a stator, and a rotor as described in claim 13, the stator is arranged in the housing, and the rotor is arranged in the stator.

Images