A rotor assembly for a low noise drive motor

Abstract

The utility model discloses a rotor assembly of low noise drive motor relates to drive motor structure field, include: transmission shaft, the outer periphery of transmission shaft is provided with two pivot keyway, first pivot keyway is along horizontal direction and is established, and the second pivot keyway forms first angle of aperture with horizontal line, a plurality of rotor core, and the inner periphery of rotor core is equipped with the core key, is equipped with the mark groove on the core key, and there is a plurality of pairs V type magnetic steel groove on the rotor core, and the core key forms second angle of aperture with horizontal line, and first V type magnetic steel groove forms third angle of aperture with horizontal line, the core key of first, third rotor core is in first pivot keyway, and the core key of second, fourth rotor core is in second pivot keyway, and the magnetic steel groove of first rotor core forms fourth angle of aperture with vertical direction, and the core key of second rotor core forms fifth angle of aperture with second pivot keyway, and the magnetic steel groove of third rotor core forms sixth angle of aperture with vertical direction, and the magnetic steel groove of fourth rotor core forms seventh angle of aperture with vertical direction.

Description

Technical Field

[0001] This utility model belongs to the field of drive motor structure, and more specifically, relates to a rotor assembly of a low-noise drive motor. Background Technology

[0002] Existing solutions to the problem of high noise levels in drive motors and electric vehicles mainly involve methods such as skewed rotor poles, creating auxiliary slots, and wrapping the drive motor with sound-insulating materials. Among these, the skewed rotor pole solution refers to creating a skewed pole structure by changing the combination of different laminations, different numbers of iron core segments, and the assembly method with the drive shaft. However, the structural design usually does not consider the influence of the magnetic pole structure of the rotor laminations themselves on the rotor skew, nor does it consider the combination of the magnetic pole structure of the rotor laminations themselves and the assembly method with the drive shaft. Therefore, how to reduce drive motor noise by changing the magnetic pole structure of the rotor laminations themselves and the cooperation structure between the magnetic pole structure of the rotor laminations and the drive shaft is the future development direction of drive motor structural design. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing a rotor assembly for a low-noise drive motor. This rotor assembly utilizes multiple rotor cores and a drive shaft to form a certain regular skew angle, thereby achieving a rotor skew effect to reduce the noise of the drive motor. At the same time, the structure of this rotor assembly can improve the assembly efficiency of the drive motor rotor assembly.

[0004] To achieve the above objectives, this utility model provides a rotor assembly for a low-noise drive motor, comprising:

[0005] A drive shaft, wherein a first keyway and a second keyway are provided on the outer periphery of the drive shaft, the first keyway is provided along the horizontal line direction, and the second keyway forms a first angle δ with the horizontal line;

[0006] Multiple rotor cores, each rotor core having a core key on its inner circumference and a marking groove on the end surface of the core key. Multiple pairs of V-shaped magnetic slots are formed on the rotor core. The core key forms a second angle α with the horizontal line. The V-shaped magnetic slot closest to the core key is the first V-shaped magnetic slot. The center line of the first V-shaped magnetic slot forms a third angle β with the horizontal line.

[0007] Multiple rotor cores are sleeved on the transmission shaft, and the rotor cores sequentially include a first rotor core, a second rotor core, a third rotor core, and a fourth rotor core;

[0008] The core key of the first rotor core and the core key of the third rotor core are both disposed in the first shaft keyway, and the core key of the second rotor core and the core key of the fourth rotor core are both disposed in the second shaft keyway. The center line of the first V-shaped magnet groove of the first rotor core forms a fourth angle with the vertical direction, the core key of the second rotor core forms a fifth angle with the second shaft keyway, the center line of the first V-shaped magnet groove of the third rotor core forms a sixth angle with the vertical direction, and the center line of the first V-shaped magnet groove of the fourth rotor core forms a seventh angle with the vertical direction. The angle of the fourth angle is β-α, the angle of the fifth and seventh angles is β, and the angle of the sixth angle is 2β-α.

[0009] Preferably, a resolver fixing groove is also provided on the side of the drive shaft near the first pivot keyway.

[0010] Preferably, the rotor core includes multiple rotor laminations, which are annular in structure, and all the rotor laminations are connected by riveting.

[0011] Preferably, each pair of V-shaped magnet slots includes two independent magnet slots, and the two magnet slots are arranged in a V-shape.

[0012] Preferably, a weight-reducing groove is provided between adjacent V-shaped magnet grooves.

[0013] Preferably, a drive shaft groove is formed at the center of the rotor lamination, an iron chip is disposed in the drive shaft groove, and a marking notch is formed at the end of the chip.

[0014] Preferably, when the rotor laminations are formed into the rotor core by riveting, the iron cores on all the rotor laminations form the core key, and the marking notches on all the rotor laminations form the marking grooves.

[0015] Preferably, the center line of the first V-shaped magnet slot of the first rotor core and the third rotor core is to the left of the center line of the first shaft keyway.

[0016] Preferably, the center line of the first V-shaped magnet groove of the second rotor core and the fourth rotor core is located to the left of the center line of the second shaft keyway.

[0017] This utility model provides a rotor assembly for a low-noise drive motor. Its advantages are as follows: the rotor assembly of the drive motor forms a certain regular skew angle by cooperating with the magnetic pole structure of the rotor lamination and the transmission shaft assembly structure to achieve the rotor skew effect to reduce the noise of the drive motor. At the same time, the assembly method of this rotor assembly can improve the assembly efficiency of the drive motor rotor assembly.

[0018] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0019] The above and other objects, features and advantages of the present invention will become more apparent from the accompanying drawings, in which like reference numerals generally represent like parts.

[0020] Figure 1 A schematic diagram of the rotor assembly of a low-noise drive motor according to an embodiment of the present invention is shown.

[0021] Figure 2 A schematic diagram of the structure of a drive shaft according to an embodiment of the present invention is shown.

[0022] Figure 3 A schematic diagram showing the angle between the second shaft keyway and the horizontal direction according to an embodiment of the present invention is shown.

[0023] Figure 4 A top view schematic diagram of a rotor core according to an embodiment of the present invention is shown.

[0024] Figure 5 A side view schematic diagram of a rotor core according to an embodiment of the present invention is shown.

[0025] Figure 6 A schematic diagram showing the assembly direction of a rotor core on a drive shaft according to an embodiment of the present invention is shown.

[0026] Figure 7 An assembly process diagram of a rotor assembly according to an embodiment of the present invention is shown.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. First keyway of the rotating shaft; 2. Second keyway of the rotating shaft; 3. Resolver fixing groove; 4. Weight reduction groove; 5. First V-shaped magnet groove; 6. Core key; 7. Marking groove; 8. Rotor lamination; 9. Drive shaft groove; 10. Riveting structure; 11. First rotor core; 12. Second rotor core; 13. Third rotor core; 14. Fourth rotor core. Detailed Implementation

[0029] Preferred embodiments of the present invention will now be described in more detail. While preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0030] like Figures 1 to 4 As shown, this utility model provides a rotor assembly for a low-noise drive motor, comprising:

[0031] A drive shaft is provided with a first keyway 1 and a second keyway 2 on its outer periphery. The first keyway 1 is arranged along the horizontal line direction, and the second keyway 2 forms a first angle δ with the horizontal line.

[0032] Four rotor cores are provided. The inner circumference of the rotor core is provided with a core key 6. The end surface of the core key 6 is provided with a marking groove 7. Multiple pairs of V-shaped magnetic steel grooves are opened on the rotor core. The core key 6 forms a second angle α with the horizontal line. The V-shaped magnetic steel groove near the core key 6 is the first V-shaped magnetic steel groove 5. The center line of the first V-shaped magnetic steel groove 5 forms a third angle β with the horizontal line.

[0033] Four rotor cores are mounted on the drive shaft. The four rotor cores are, in order, the first rotor core 11, the second rotor core 12, the third rotor core 13, and the fourth rotor core 14.

[0034] The core key 6 of the first rotor core 11 and the core key 6 of the third rotor core 13 are both located in the first shaft keyway 1. The core key 6 of the second rotor core 12 and the core key 6 of the fourth rotor core 14 are both located in the second shaft keyway 2. The center line of the first V-shaped magnetic groove 5 of the first rotor core 11 forms a fourth angle with the vertical direction. The core key 6 of the second rotor core 12 forms a fifth angle with the second shaft keyway 2. The center line of the first V-shaped magnetic groove 5 of the third rotor core 13 forms a sixth angle with the vertical direction. The center line of the first V-shaped magnetic groove 5 of the fourth rotor core 14 forms a seventh angle with the vertical direction. The angle of the fourth angle is β-α, the angle of the fifth and seventh angles is β, and the angle of the sixth angle is 2β-α.

[0035] Specifically, two keyways are formed on the drive shaft, and the two keyways are arranged opposite each other in the circumferential direction. When the first keyway 1 on the drive shaft is parallel to the horizontal direction, the edge of the second keyway 2 on the opposite side forms a first angle with the horizontal direction, and the angle of the first angle is δ. In addition, the four rotor cores fitted on the drive shaft adopt the same structural design. The inner circumference of the annular structure of each rotor core is provided with a core key 6, and a marking groove 7 is formed at the end of the core key 6 away from the annular structure of the rotor core. Multiple marking grooves are formed in the circumferential direction of the rotor core. For the V-shaped magnetic slots, the first V-shaped magnetic slot 5 is closest to the core key 6 and the rotor core annular structure. When the rotor core is placed horizontally, the two sides of the core key 6 form a second angle with the horizontal direction, the angle of which is α. The center line of the first V-shaped magnetic slot 5 forms a third angle with the horizontal line, the angle of which is β. After the four rotor cores are fitted onto the drive shaft, from one end of the drive shaft to the other end, they are, in order, the first rotor core 11, the second rotor core 12, the third rotor core 13, and the fourth rotor core 14. 4. During the assembly of the four rotor cores, the first keyway 1 of the drive shaft is always vertically upward. The core keys 6 of the first rotor core 11 and the third rotor core 13 are engaged with the first keyway 1, and the core keys 6 of the second rotor core 12 and the fourth rotor core 14 are engaged with the second keyway 2. When the rotor cores are assembled onto the drive shaft, the first rotor core 11 to the fourth rotor core are installed onto the drive shaft sequentially. After the first rotor core 11 is assembled, the first... The centerline of the V-shaped magnet slot 5 is offset to the left by an angle of β-α relative to the vertical direction. After the second rotor core 12 is assembled, the core key 6 of the second rotor core 12 is offset to the left by an angle of β relative to the second shaft keyway 2. After the third rotor core 13 is assembled, the centerline of the first V-shaped magnet slot 5 of the third rotor core 13 is offset to the left by an angle of 2β-α relative to the vertical direction. After the fourth rotor core 14 is assembled, the centerline of the first V-shaped magnet slot 5 of the third rotor core 13 is offset to the left by an angle of β relative to the vertical direction. The angle range of δ is 1.25° to 1.75°, and the angle ranges of α and β are 1.25° to 2.5°.

[0036] like Figure 2 As shown, a resolver fixing groove 3 is also provided on the side of the drive shaft near the first rotating shaft keyway 1.

[0037] Specifically, in addition to two keyways on the drive shaft, a resolver fixing groove 3 is also provided on the same side of the first keyway 1.

[0038] like Figure 4 and Figure 5 As shown, the rotor core includes multiple rotor laminations 8, which are ring-shaped and are connected by riveting.

[0039] Preferably, each pair of V-shaped magnetic grooves 5 includes two independent magnetic grooves 5, and the two magnetic grooves 5 are arranged in a V-shape.

[0040] Preferably, a weight-reducing groove 4 is provided between adjacent V-shaped magnet grooves 5.

[0041] Preferably, a drive shaft groove 9 is provided at the center of the rotor lamination 8, and an iron chip is provided in the drive shaft groove 9, with a marking notch at the end of the chip.

[0042] Preferably, when the rotor laminations 8 are formed into rotor cores by riveting, the iron cores on all rotor laminations 8 form core keys 6, and the marking notches on all rotor laminations 8 form marking grooves 7.

[0043] Specifically, each rotor core is formed by assembling multiple rotor laminations 8 together and then riveting them together. Each rotor lamination 8 has the same structure; it is an annular lamination with multiple pairs of magnetic slots circumferentially formed on its annular portion. Each pair of slots consists of two slots arranged in a V-shape, with the V-shaped tip pointing towards the center of the rotor lamination 8. A weight-reducing slot 4 is also provided between adjacent pairs of slots, located on the side of the slot closest to the center of the rotor lamination 8. This weight-reducing slot 4 reduces the weight of the rotor core itself. On the other hand, it can also play a role in heat dissipation; the annular interior of the rotor lamination 8 serves as the drive shaft groove 9. When multiple rotor laminations 8 are riveted to form a rotor core, the drive shaft groove 9 is the space through which the drive shaft passes. Iron chips are also extended on the inner circumference of the drive shaft groove 9. The ends of the iron chips have marking notches. When multiple rotor laminations 8 are riveted to form a rotor core, the iron chips of multiple rotor laminations 8 form the core key 6, and the marking notches of multiple rotor laminations 8 form the marking groove 7. Multiple snap-fit ​​structures 10 are also provided on the annular part of the rotor lamination 8. Multiple rotor laminations 8 can be pressed into a rotor core by their own snap-fit ​​structures 10.

[0044] Preferably, the center line of the first V-shaped magnet groove 5 of the first rotor core 11 and the third rotor core 13 is located to the left of the center line of the first shaft keyway 1.

[0045] Preferably, the center line of the first V-shaped magnet groove 5 of the second rotor core 12 and the fourth rotor core 14 is located to the left of the center line of the second shaft keyway 2.

[0046] Specifically, the rotor laminations 8 are stacked together by the riveting structure 10 to form multiple segmented rotor cores. According to different assembly sequences and assembly methods, multiple rotor cores can be sleeved on the drive shaft and engaged with the keyways of the two shafts to form the drive motor rotor assembly structure and achieve the ideal rotor skew structure.

[0047] like Figure 1 , Figure 6 and Figure 7 As shown, when assembling the rotor assembly of this low-noise drive motor, with the view from the resolver to the non-resolver side as the frontal direction, the assembly steps are as follows:

[0048] First assembly

[0049] When viewed from the front, the first keyway 1 of the drive shaft is located at the top. The two keyway surfaces of the first keyway 1 are symmetrical in the vertical direction. The marking groove 7 on the first rotor core 11 is located on the left. Then, the core key 6 of the first rotor core 11 is assembled with the first keyway 1. After assembly, the center line of the first V-shaped magnet groove 5 of the first rotor core 11 is offset to the left by an angle of (β-α) relative to the vertical direction.

[0050] Second assembly

[0051] When viewed from the front, place the second rotor core 12 in the same direction as the first rotor core 11. Then, rotate the second rotor core 12 counterclockwise by about 180° along the central axis of the drive shaft so that the core key 6 of the second rotor core 12 corresponds to the keyway 2 of the second shaft. In this way, the marking groove 7 on the second rotor core 12 is located on the right side. Then, assemble the core key 6 of the second rotor core 12 with the keyway 2 of the second shaft. After assembly, the core key 6 of the second rotor core 12 is offset to the left by an angle β relative to the keyway 2 of the second shaft.

[0052] Third stage assembly

[0053] Looking straight ahead, place the third rotor core 13 in the same direction as the first rotor core 11. Then, reverse the third rotor core 13 so that the direction of the snap-fit ​​structure 10 of the third rotor core 13 is opposite to the direction of the snap-fit ​​structure 10 of the first rotor core 11. Then, assemble the core key 6 of the third rotor core 13 with the first shaft keyway 1. The marking groove 7 of the third rotor core 13 is located on the right side in the straight-looking direction. After assembly, the center line of the first V-shaped magnet groove 5 of the third rotor core 13 is offset to the left by an angle of (2β-α) relative to the vertical direction.

[0054] Fourth stage assembly

[0055] According to the arrangement of the third rotor core 13, the fourth rotor core 14 is rotated counterclockwise by about 180° along the central axis of the transmission shaft. In this way, the core key 6 of the fourth rotor core 14 corresponds to the keyway 2 of the second shaft. Then, the core key 6 of the fourth rotor core 14 and the keyway 2 of the second shaft are assembled. After assembly, the center line of the first V-shaped magnet groove 5 of the fourth rotor core 14 is offset to the left by an angle β relative to the vertical direction.

[0056] Ultimately, all four rotor cores are fitted onto the drive shaft, forming a straight groove with the same angle between adjacent rotor core grooves. This assembly effectively reduces the operating noise of the drive motor.

[0057] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A rotor assembly for driving a motor with low noise, characterized in that include: A drive shaft, wherein a first keyway and a second keyway are provided on the outer periphery of the drive shaft, the first keyway is provided along the horizontal line direction, and the second keyway forms a first angle δ with the horizontal line; Multiple rotor cores, each rotor core having a core key on its inner circumference and a marking groove on the end surface of the core key. Multiple pairs of V-shaped magnetic slots are formed on the rotor core. The core key forms a second angle α with the horizontal line. The V-shaped magnetic slot closest to the core key is the first V-shaped magnetic slot. The center line of the first V-shaped magnetic slot forms a third angle β with the horizontal line. The rotor core is sleeved on the transmission shaft, and the rotor core includes, in sequence, a first rotor core, a second rotor core, a third rotor core, and a fourth rotor core. The core key of the first rotor core and the core key of the third rotor core are both disposed in the first shaft keyway, and the core key of the second rotor core and the core key of the fourth rotor core are both disposed in the second shaft keyway. The center line of the first V-shaped magnet groove of the first rotor core forms a fourth angle with the vertical direction, the core key of the second rotor core forms a fifth angle with the second shaft keyway, the center line of the first V-shaped magnet groove of the third rotor core forms a sixth angle with the vertical direction, and the center line of the first V-shaped magnet groove of the fourth rotor core forms a seventh angle with the vertical direction. The angle of the fourth angle is β-α, the angle of the fifth and seventh angles is β, and the angle of the sixth angle is 2β-α.

2. The rotor assembly of the low-noise drive motor according to claim 1, characterized in that, A resolver fixing groove is also provided on the side of the drive shaft near the keyway of the first rotating shaft.

3. The rotor assembly of the low-noise drive motor according to claim 1, characterized in that, The rotor core includes multiple rotor laminations, which are ring-shaped and connected by riveting.

4. The rotor assembly of the low-noise drive motor according to claim 1, characterized in that, Each pair of V-shaped magnet slots includes two independent magnet slots, which are arranged in a V-shape.

5. The rotor assembly of the low-noise drive motor according to claim 1, characterized in that, A weight-reducing groove is provided between adjacent V-shaped magnet grooves.

6. The rotor assembly of the low-noise drive motor according to claim 3, characterized in that, A drive shaft groove is provided at the center of the rotor lamination, and an iron chip is provided in the drive shaft groove. A marking notch is provided at the end of the iron chip.

7. The rotor assembly of the low-noise drive motor according to claim 6, characterized in that, When the rotor laminations are formed into the rotor core by riveting, the iron cores on all the rotor laminations form the core key, and the marking notches on all the rotor laminations form the marking grooves.

8. The rotor assembly of the low-noise drive motor according to claim 1, characterized in that, The center line of the first V-shaped magnet groove of the first rotor core and the third rotor core is located to the left of the center line of the first shaft keyway.

9. The rotor assembly of the low-noise drive motor according to claim 1, characterized in that, The center line of the first V-shaped magnet groove of the second rotor core and the fourth rotor core is located to the left of the center line of the second shaft keyway.

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