Sectional type skewed pole magnetic steel rotor structure

Abstract

The invention discloses a segmented skewed pole magnetic steel rotor structure, which comprises a rotor body and a magnetic steel body, the rotor body is a circular ring block, a plurality of magnetic steel grooves are formed in the rotor body along the circumferential direction at equal angle intervals, and each magnetic steel groove is composed of a plurality of insertion grooves. The multiple insertion grooves in the same group of magnetic steel grooves are communicated one by one, the insertion grooves penetrate through the two ends of the rotor body in the thickness direction, every two adjacent insertion grooves are arranged in a staggered mode, and one magnetic steel body is inserted into each insertion groove. The motor rotor has the effect of reducing vibration and noise when the rotor rotates.

Description

Technical Field

[0001] This application relates to the technical field of the performance of magnet rotors, and in particular to a segmented skewed-pole magnet rotor structure. Background Art

[0002] Brushless motors are widely used in various fields due to their high efficiency and high reliability. However, the problems of noise and vibration during motor operation have always been technical difficulties. On a traditional magnet rotor, a number of magnet slots are equally spaced along the circumferential direction, and a single-plate magnet is provided in each magnet slot. The magnetic poles of a number of magnets are concentrated at the central axis position of the rotor. A radial magnetic isolation bridge is provided between the magnet and the rotor center to reduce magnetic leakage.

[0003] Regarding the above related technology, the inventor believes that during the rotation of the above magnet rotor, the sinusoidal property of the air-gap magnetic density waveform is poor, and the torque ripple is significant. Moreover, the width of the radial magnetic bridge is limited, it is prone to saturation and the harmonic suppression effect is poor. Summary of the Invention

[0004] In order to reduce the vibration and noise during the rotation of the rotor, this application provides a segmented skewed-pole magnet rotor structure.

[0005] A segmented skewed-pole magnet rotor structure provided by this application adopts the following technical solution: A segmented skewed-pole magnet rotor structure includes a rotor body and a magnet body. The rotor body is in a circular ring shape. A number of magnet slots are equally angularly spaced along the circumferential direction on the rotor body. The magnet slots are composed of a number of insertion slots. A number of the insertion slots in the same group of magnet slots are connected in sequence. The insertion slots penetrate through both ends in the thickness direction of the rotor body. Adjacent two insertion slots are staggered. One magnet body is inserted in each insertion slot.

[0006] By adopting the above technical solution, by disassembling a single magnet into a number of staggered ones, a skewed-pole state is formed on the rotor body, thereby optimizing the sinusoidal waveform characteristic of the air-gap magnetic density to reduce the torque ripple and vibration noise of the motor.

[0007] Through the mutual cooperation of the rotor body and the magnet body, it has the effect of reducing the vibration and noise during the rotation of the rotor.

[0008] Optionally, a number of edge slots are equally angularly spaced on the outer peripheral wall of the rotor body. The edge slots are arranged between two adjacent magnet slots.

[0009] By adopting the above technical solution, the setting of the edge groove further optimizes the sine waveform characteristics of the air-gap magnetic density, so as to reduce the torque ripple and vibration noise of the motor. The sinusoidality of the back electromotive force waveform and the level rate of the waveform are well optimized, making the operation of the rotor body relatively stable and with low noise.

[0010] Optionally, the staggered height between two adjacent magnetic steel grooves is 1 / 3 of the thickness of the magnetic steel body.

[0011] By adopting the above technical solution, the staggered height between two adjacent magnetic steel grooves is maintained at 1 / 3 of the thickness of the magnetic steel body, so that the formed magnetic poles and the axis of the rotor body are kept within an optimal included angle range, realizing the maximum reduction of the cogging torque, optimizing the sine waveform characteristics of the air-gap magnetic density, and minimizing the vibration generated during the rotation of the rotor body.

[0012] Optionally, three magnetic steel bodies are arranged in each magnetic steel groove. Insertion grooves are formed on the same side of the magnetic steel bodies located in the middle and at one end of the magnetic steel groove, and insertion strips are formed on the same side of the magnetic steel bodies located in the middle and at the other end of the magnetic steel groove. The insertion strips correspond to and are inserted and matched with the magnetic steel grooves on the adjacent magnetic steel bodies.

[0013] By adopting the above technical solution, two adjacent magnetic steel bodies are inserted and matched through the insertion strips and insertion grooves, reducing the possibility that relative movement and collision occur between two adjacent magnetic steel bodies during rotation, resulting in an increase in noise.

[0014] Optionally, a connection component for positioning the magnetic steel body is arranged on the rotor body. The connection component includes a connection block, a sliding column, a pressing block and a pressing air bag. A connection groove is formed on one side of the magnetic steel body close to the central axis of the rotor body. A number of first communication grooves are formed in the rotor body. The number of the first communication grooves is arranged in one-to-one correspondence with the number of the magnetic steel grooves. A number of second communication grooves are arranged in parallel connection between the first communication groove and the corresponding magnetic steel groove. The number of the second communication grooves is arranged in one-to-one correspondence with the number of the insertion grooves. The pressing block is slidably connected in the first communication groove. One connection block is slidably arranged in each second communication groove. A sliding hole is formed at one end of the connection block close to the pressing block. One sliding column is slidably arranged in each sliding hole. One pressing air bag is arranged in each sliding hole. One side of the pressing air bag is connected to the inner bottom wall of the sliding hole, and the other side is connected to the end of the sliding column. The end of the sliding column far from the pressing air bag is connected to the pressing block. A driving member for driving the pressing block to move is arranged on the rotor body.

[0015] By adopting the above technical solution, the driving member drives the extrusion block to slide towards the direction close to the magnet body, and the end of the connecting block is embedded in the connecting groove of the magnet body, realizing the limitation of the magnet body and reducing the possibility of the magnet falling out of the magnet groove during the rotation of the rotor body. The sliding column and the pressing airbag are arranged to absorb the vibration of the magnet body during rotation, and further reduce the noise generated during the rotation of the rotor body.

[0016] Optionally, the driving member includes a propulsion block, a propulsion screw and a return spring. One end of the propulsion block away from the magnet groove is provided with a propulsion inclined surface. A propulsion chute is formed in the rotor body, and the propulsion chute is communicated with the first communication groove. The propulsion block is slidably arranged in the propulsion chute. One end of the propulsion block close to the first communication groove is provided with a propulsion inclined surface. One end of the extrusion block close to the propulsion chute is provided with an extrusion inclined surface, and the extrusion inclined surface is arranged corresponding to the propulsion inclined surface. The return spring is arranged in the first communication groove. One end of the return spring is connected to the inner wall of the first communication groove close to the second communication groove, and the other end of the return spring is connected to one end of the extrusion block close to the second communication groove. In the natural state, the extrusion inclined surface is slidably attached to the propulsion inclined surface under the action of the return spring. The propulsion screw is threadedly connected to the rotor body, and the arrangement direction of the propulsion screw is perpendicular to one side of the rotor body. One end of the propulsion screw extends into the propulsion chute and is rotatably connected to the propulsion block.

[0017] By adopting the above technical solution, when driving the extrusion block, rotate the propulsion screw. The propulsion block moves towards the direction close to the first communication groove under the limitation of the propulsion chute and the driving action of the propulsion screw. The propulsion inclined surface and the extrusion inclined surface slide relatively, and the extrusion block slides in it under the pushing of the propulsion block and the limitation of the extrusion chute.

[0018] Optionally, a driving thread section is arranged on the whole section of the propulsion screw. One end of the propulsion screw away from the propulsion block is provided with an anti-loosening thread section, and the anti-loosening thread section overlaps with part of the driving thread section. The driving thread section and the anti-loosening thread section have opposite helix directions. A locking nut is threadedly connected to the driving thread section, and the locking nut abuts against the rotor body. An anti-loosening nut is threadedly connected to the anti-loosening thread section, and the anti-loosening nut is attached to the side of the locking nut away from the rotor body.

[0019] By adopting the above technical solution, when the rotor body vibrates, the locking nut rotates on the propulsion screw under vibration. Since the internal thread helix directions of the anti-loosening nut and the locking nut are opposite, the two will rotate in opposite directions during vibration, reducing the possibility of the locking nut rotating and disengaging from the propulsion screw.

[0020] Optionally, a first elastic pad is provided on the outer wall of the magnet body, and a second elastic pad is provided on the inner wall of the magnet groove. When the magnet body is inserted into the magnet groove, the first elastic pad abuts against the second elastic pad.

[0021] By adopting the above technical solution, the arrangement of the first elastic pad and the second elastic pad fills the gap between the magnet body and the inner wall of the magnet groove, which helps to further reduce the possibility of the magnet body vibrating in the magnet groove during rotation.

[0022] In summary, the present application includes at least one of the following beneficial technical effects: 1. By disassembling a single magnet into several staggered ones, an inclined pole state is formed on the rotor body, thereby optimizing the sine wave characteristic of the air gap magnetic density to reduce the torque ripple and vibration noise of the motor; 2. The arrangement of the connecting component reduces the possibility of the magnet falling out of the magnet groove during the rotation of the rotor body; 3. The arrangement of the first elastic pad and the second elastic pad fills the gap between the magnet body and the inner wall of the magnet groove, which helps to further reduce the possibility of the magnet body vibrating in the magnet groove during rotation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of Embodiment 1 of the present application for embodying a segmented inclined pole magnet rotor structure.

[0024] Figure 2 is a schematic structural diagram of Embodiment 2 of the present application for embodying a segmented inclined pole magnet rotor structure.

[0025] Figure 3 is Figure 2 an enlarged view of part A in

[0026] Figure 4 is a partial cross-sectional view of the connecting component in Embodiment 2 of the present application for embodying.

[0027] Description of the reference numerals: 1. Rotor body; 101. Magnet groove; 102. Edge groove; 103. First communication groove; 104. Second communication groove; 105. Propulsion chute; 2. Magnet body; 21. First elastic pad; 22. Second elastic pad; 23. Connection groove; 3. Connecting component; 31. Connection block; 32. Sliding column; 33. Compression airbag; 34. Extrusion block; 341. Extrusion inclined surface; 35. Propulsion block; 351. Propulsion inclined surface; 36. Return spring; 37. Propulsion screw; 38. Locking nut; 39. Anti-loosening nut; 4. Insertion strip; 5. Insertion slot; 6. Driving thread section; 7. Anti-loosening thread section. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The following will further elaborate on this application in conjunction with the attached Figures 1-4 figures. The embodiment of this application provides a segmented skewed-pole permanent magnet rotor structure, which has the effect of reducing the vibration and noise of the rotor during rotation.

[0029] Embodiment 1 Referring to Figure 1 , a segmented skewed-pole permanent magnet rotor structure includes a rotor body 1 and a permanent magnet body 2. The rotor body 1 is arranged in a circular ring shape, and a plurality of magnet slots 101 are opened on the rotor body 1 at equal angular intervals along the circumferential direction. The magnet slots 101 include three insertion slots that are connected end to end and communicate with each other. Adjacent two insertion slots are staggered, and the staggering height of adjacent two insertion slots is 1 / 3 of the thickness of the insertion slot.

[0030] Referring to Figure 1 , one permanent magnet body 2 is inserted into the inner cavity of each insertion slot, and the length of the permanent magnet body 2 is the same as the thickness of the rotor body 1. A plurality of edge slots 102 are arranged at equal intervals along the circumferential direction on the outer ring wall of the rotor body 1, and the edge slots 102 are arranged between adjacent two magnet slots 101.

[0031] Referring to Figure 1 , the original whole permanent magnet is separated into sequentially staggered permanent magnet bodies 2, so that the formed magnetic poles maintain a certain angle with the central axis of the rotor body 1. The staggered permanent magnet bodies 2 form a skewed-pole state on the rotor body 1, which plays a role in optimizing the sine wave characteristic of the air-gap magnetic density, so as to reduce the torque ripple and vibration noise of the motor. A plurality of edge slots 102 are arranged between adjacent two magnet slots 101, which further improves the sine wave characteristic of the air-gap magnetic density, thereby reducing the torque ripple and vibration noise of the motor. At this time, the sinusoidality of the back electromotive force waveform and the waveform level rate are well optimized, making the operation of the rotor body 1 relatively stable and the noise relatively low.

[0032] Referring to Figure 1 , adjacent two permanent magnet bodies 2 are detachably and quickly connected through a plugging strip 4 and a plugging slot 5, reducing the possibility that adjacent two permanent magnet bodies 2 collide or rub against each other during use, resulting in an increase in noise.

[0033] The implementation principle of a segmented skew-pole permanent magnet rotor structure in Embodiment 1 of this application is as follows: The original single permanent magnet is divided into permanent magnet bodies 2 arranged alternately in sequence, so that the formed magnetic poles maintain a certain angle with the central axis of the rotor body 1, forming a skew-pole state on the rotor body 1, which optimizes the sine waveform characteristics of the air-gap magnetic density, so as to reduce the torque ripple and vibration noise of the motor. A number of edge slots 102 are arranged between two adjacent magnet slots 101, further improving the sine waveform characteristics of the air-gap magnetic density, thereby reducing the torque ripple and vibration noise of the motor.

[0034] Embodiment 2 Refer to Figure 2 and Figure 3 In Embodiment 2, different from Embodiment 1, it further includes a connection component 3. Insertion strips 4 are connected to the same side of two permanent magnet bodies 2 located at one end of the magnet slot 101 and in the middle of the magnet slot 101. Insertion slots 5 corresponding to the shape of the insertion strips 4 are opened on the same side of two permanent magnet bodies 2 located at the other end of the magnet slot 101 and in the middle of the magnet slot 101. The insertion strips 4 are inserted into the insertion slots 5 of adjacent permanent magnet bodies 2, realizing stable detachable connection of adjacent permanent magnet bodies 2. A first elastic pad 21 is arranged on the outer wall of the permanent magnet body 2, and a second elastic pad 22 is connected along the circumferential direction on the inner wall of the magnet slot 101. When the permanent magnet body 2 is inserted into the corresponding insertion slot, the first elastic pad 21 abuts against the second elastic pad 22.

[0035] Refer to Figures 2-4 In addition, a connection groove 23 is opened on the side of the permanent magnet body 2 close to the central axis of the rotor body 1, and several groups of connection components 3 are arranged on the rotor body 1. The connection component 3 includes a connection block 31, a sliding column 32, a compression airbag 33, an extrusion block 34, a propulsion block 35, a return spring 36, a propulsion screw 37, a locking nut 38, and an anti-loosening nut 39. A number of first communication grooves 103 are arranged along the circumferential direction in the rotor body 1. The first communication grooves 103 are arranged between the axis of the rotor body 1 and the magnet slot 101, and the several first communication grooves 103 are arranged in one-to-one correspondence with the several magnet slots 101. Three second communication grooves 104 are parallelly opened on one side of the first communication groove 103. The three second communication grooves 104 on the same first communication groove 103 are arranged in one-to-one correspondence and communication with the three insertion slots on the corresponding magnet slot 101. A propulsion chute 105 is opened along the thickness direction of the rotor body 1 on one side of the first communication groove 103. The propulsion chute 105 is vertically communicated with the first communication groove 103. The settings of the first elastic pad 21 and the second elastic pad 22 fill the gap between the permanent magnet body 2 and the inner wall of the magnet slot 101, further reducing the possibility of relative friction between the permanent magnet body 2 and the inner wall of the magnet slot 101, resulting in an increase in noise.

[0036] Refer to Figures 2-4, the extrusion block 34 is slidably arranged in the first communication groove 103. Three sliding columns are parallelly connected to one end of the extrusion block 34 close to the magnet body 2. One connecting block 31 is arranged in each second communication groove 104. A sliding hole is formed in one end of the connecting block 31 far from the magnet groove 101 along the length direction of the second communication groove 104. A number of sliding columns correspond to a number of connecting blocks 31 one by one, and the sliding columns are slidably inserted into the sliding holes of the corresponding connecting blocks 31. One pressing airbag 33 is arranged in each sliding hole. One side of the pressing airbag is connected to the inner bottom wall of the sliding hole, and the other side is connected to the end of the sliding column. An extrusion inclined surface 341 is arranged on one side of the extrusion block 34 far from the sliding column. The return spring 36 is arranged in the first communication groove 103. One end of the return spring 36 is connected to the inner wall of the first communication groove 103 close to the second communication groove 104, and the other end is connected to the extrusion block 34.

[0037] Refer to Figures 2-4 , the pushing block 35 is slidably arranged in the pushing chute 105. A pushing inclined surface 351 corresponding to the extrusion inclined surface 341 is formed in one end of the pushing block 35 close to the extrusion block 34. The pushing screw 37 is threadedly connected to the rotor body 1. The length direction of the pushing screw 37 is perpendicular to the first communication groove 103. One end of the pushing screw 37 extends into the pushing chute 105 and is rotatably connected to one end of the pushing block 35 far from the first communication groove 103. In the natural state, the pushing inclined surface 351 and the extrusion inclined surface 341 are slidably and fittingly arranged under the action of the return spring 36. A driving thread section 6 is arranged on the whole section of the pushing screw 37. An anti-loosening thread section 7 is arranged on the rod section of the pushing screw 37 extending out of the rotor body 1. The helix direction of the anti-loosening thread section 7 is opposite to that of the driving thread section 6. A locking nut 38 is threadedly connected to the driving thread section 6. The locking nut 38 abuts against the outer wall of the rotor body 1. An anti-loosening nut 39 is threadedly connected to the anti-loosening thread section 7. The helix direction of the anti-loosening nut 39 is opposite to that of the internal thread of the locking nut 38. The anti-loosening nut 39 and the locking nut 38 are arranged in a mutually fitting manner.

[0038] Refer to Figure 3 and Figure 4, after inserting the magnet body 2 into the magnet slot 101, screw the propulsion screw 37. The propulsion slider slides in the propulsion chute 105, and relative sliding occurs between the propulsion inclined surface 351 and the extrusion inclined surface 341. The connecting block 31 slides in the second communication groove 104 until it is embedded in the connecting groove 23 of the magnet body 2, realizing the connection of the magnet body 2 and reducing the possibility of the magnet body 2 coming out of the magnet slot 101 during rotation. The setting of the pressing airbag 33 helps to absorb the vibration generated when the magnet body 2 is used, and further reduces the noise generated during rotation. The lock nut 38 fixes the propulsion screw 37. When vibration occurs, the two nuts may rotate on the propulsion screw 37. Since the thread rotation directions of the anti-loosening nut 39 and the lock nut 38 are opposite, the lock nut 38 and the anti-loosening nut 39 will rotate in opposite directions, reducing the possibility of the lock nut 38 falling off the propulsion screw 37 during vibration.

[0039] The implementation principle of a segmented skewed-pole magnet rotor structure in Embodiment 2 of this application is as follows: after inserting the magnet body 2 into the magnet slot 101, screw the propulsion screw 37. The connecting block 31 is embedded in the connecting groove 23 of the magnet body 2, realizing the connection of the magnet body 2 and reducing the possibility of the magnet body 2 coming out of the magnet slot 101 during rotation. The setting of the pressing airbag 33 helps to absorb the vibration generated when the magnet body 2 is used, and further reduces the noise generated during rotation.

[0040] The above are all the preferred embodiments of this application. The protection scope of this application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A segmented skewed pole permanent magnet rotor structure, characterized in that: It includes a rotor body (1) and a magnet body (2). The rotor body (1) is in the shape of a circular ring block. A number of magnet slots (101) are equiangularly spaced along the circumference on the rotor body (1). The magnet slots (101) are composed of a number of insertion slots. A number of the insertion slots in the same set of magnet slots (101) are connected in sequence. The insertion slots penetrate through both ends of the rotor body (1) in the thickness direction. Adjacent two insertion slots are staggered. One magnet body (2) is inserted in each insertion slot.

2. The segmented skew pole permanent magnet rotor structure according to claim 1, characterized in that: A number of edge slots (102) are equiangularly spaced on the outer peripheral wall of the rotor body (1). The edge slots (102) are arranged between two adjacent magnet slots (101).

3. The segmented skew-pole permanent magnet rotor structure according to claim 2, wherein: The staggered height of two adjacent magnet slots (101) is 1 / 3 of the thickness of the magnet body (2).

4. A segmented skew pole permanent magnet rotor structure according to claim 3, characterized in that: Three magnet bodies (2) are arranged in each magnet slot (101). Insertion slots (5) are provided on the same side of the magnet bodies (2) located in the middle and at one end of the magnet slot (101). Insertion bars (4) are provided on the same side of the magnet bodies (2) located in the middle and at the other end of the magnet slot (101). The insertion bars (4) correspond to and are inserted and matched with the magnet slots (101) on the adjacent magnet bodies (2).

5. A segmented inclined pole permanent magnet rotor structure according to claim 4, characterized in that: A connection component (3) for positioning the magnet body (2) is provided on the rotor body (1). The connection component (3) includes a connection block (31), a sliding column (32), an extrusion block (34), and a pressing airbag (33). A connection slot (23) is provided on one side of the magnet body (2) close to the central axis of the rotor body (1). A number of first communication slots (103) are provided in the rotor body (1). The number of first communication slots (103) corresponds to the number of magnet slots (101) one by one. A number of second communication slots (104) are parallelly connected between the first communication slots (103) and the corresponding magnet slots (101). The number of second communication slots (104) corresponds to the number of insertion slots one by one. The extrusion block (34) is slidably connected in the first communication slot (103). One connection block (31) is slidably arranged in each second communication slot (104). A sliding hole is provided at one end of the connection block (31) close to the extrusion block (34). One sliding column (32) is slidably arranged in each sliding hole. One pressing airbag (33) is provided in each sliding hole. One side of the pressing airbag (33) is connected to the inner bottom wall of the sliding hole, and the other side is connected to the end of the sliding column (32). The end of the sliding column (32) away from the pressing airbag is connected to the extrusion block (34). A driving member for driving the extrusion block (34) to move is provided on the rotor body (1).

6. A segmented skew pole permanent magnet rotor structure according to claim 5, characterized in that: The driving member includes a pushing block (35), a pushing screw (37) and a return spring (36). One end of the pushing block (35) away from the magnet groove (101) is provided with a pushing inclined surface (351). A pushing sliding groove (105) is formed in the rotor body (1). The pushing sliding groove (105) is communicated with the first communication groove (103). The pushing block (35) is slidably arranged in the pushing sliding groove (105). One end of the pushing block (35) close to the first communication groove (103) is provided with a pushing inclined surface (351). One end of the pressing block (34) close to the pushing sliding groove (105) is provided with a pressing inclined surface (341). The pressing inclined surface (341) is correspondingly arranged with the pushing inclined surface (351). The return spring (36) is arranged in the first communication groove (103). One end of the return spring (36) is connected to the inner wall of the first communication groove (103) close to the second communication groove (104). The other end of the return spring (36) is connected to one end of the pressing block (34) close to the second communication groove (104). In the natural state, the pressing inclined surface (341) is slidably attached to the pushing inclined surface (351) under the action of the return spring (36). The pushing screw (37) is threadedly connected to the rotor body (1). The setting direction of the pushing screw (37) is perpendicular to one side of the rotor body (1). One end of the pushing screw (37) extends into the pushing sliding groove (105) and is rotatably connected to the pushing block (35).

7. A segmented skew-pole magnet rotor structure according to claim 6, characterized in that: A driving thread section (6) is arranged on the whole section of the pushing screw (37). One end of the pushing screw (37) away from the pushing block (35) is provided with an anti-loosening thread section (7). The anti-loosening thread section (7) overlaps with a part of the driving thread section (6). The driving thread section (6) and the anti-loosening thread section (7) have opposite helix directions. A locking nut (38) is threadedly connected to the driving thread section (6). The locking nut (38) abuts against the rotor body (1). An anti-loosening nut (39) is threadedly connected to the anti-loosening thread section (7). The anti-loosening nut (39) is attached to the side of the locking nut (38) away from the rotor body (1).

8. A segmented skew-pole permanent magnet rotor structure according to claim 1, characterized in that: A first elastic pad (21) is arranged on the outer wall of the magnet body (2). A second elastic pad (22) is arranged on the inner wall of the magnet groove (101). When the magnet body (2) is inserted into the magnet groove (101), the first elastic pad (21) abuts tightly against the second elastic pad (22).

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