Motor rotor and motor

Abstract

The utility model discloses a motor rotor and a motor, and belongs to the technical field of motor equipment. The outer periphery of the motor rotor is provided with at least one balance hole, the motor rotor comprises a first part and a second part which are distributed in the axial direction, the first part is provided with at least one concave part, the concave part is sunken relative to the outer peripheral face of the second part, and the inner surface of the concave part is matched with the outer peripheral face of the second part to form a first dustproof step arranged in the axial direction. And the at least one concave part and the at least one balance hole are distributed along the circumferential direction of the motor rotor. The motor rotor provided by the utility model is provided with the first dustproof step, and the dust is intercepted through the first dustproof step, so that the dust prevention of the motor is realized under the condition that the heat dissipation performance of the motor is not influenced; and the balance hole is formed, and the balance of the motor rotor can be corrected through the balance hole, so that the balance of the motor rotor is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of motor equipment, in particular to a motor rotor and a motor including the motor rotor. Background Art

[0002] A motor mainly consists of a rotor and a stator. After assembly, there will be a certain gap between them. During long-term use, some dust may enter the motor through the gap, resulting in abnormal motor noise performance and even shortening the service life of the motor. In related technologies, some motors use a sealing structure for dust prevention, but this structure is complex, costly, and may affect the heat dissipation performance of the motor. In addition, when the rotor rotates, due to uneven mass distribution, the force is unbalanced, which may lead to poor vibration and noise performance of the motor and even reduce the service life of the motor. Therefore, the rotor generally needs to be dynamically balanced after production. Applying dynamic balance clay on the rotor surface is a common method for correcting dynamic balance, but there are problems such as poor adhesion, possible interference between the clay and nearby structures after rotor assembly, and a long waiting time for curing. Summary of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems in the related technologies to a certain extent.

[0004] To this end, an object of the utility model is to provide a motor rotor, which is configured with a first dust-proof step to intercept dust, thereby achieving dust prevention for the motor without affecting the heat dissipation performance of the motor; and is provided with balance holes, through which the dynamic balance of the motor rotor can be corrected to improve the balance of the motor rotor.

[0005] Another object of the utility model is to provide a motor, which includes the aforementioned motor rotor.

[0006] According to the motor rotor of the embodiment of the utility model, at least one balance hole is provided on the outer periphery of the motor rotor. The motor rotor includes a first part and a second part distributed along the axial direction. The first part is provided with at least one concave portion, the concave portion is recessed relative to the outer peripheral surface of the second part, and the inner surface of the concave portion and the outer peripheral surface of the second part cooperate to form a first dust-proof step arranged along the axial direction. The at least one concave portion and the at least one balance hole are distributed along the circumferential direction of the motor rotor.

[0007] According to the motor rotor of the embodiment of the utility model, it is configured with a first dust-proof step to intercept dust, thereby achieving dust prevention for the motor without affecting the heat dissipation performance of the motor; and is provided with balance holes, through which the dynamic balance of the motor rotor can be corrected to improve the balance of the motor rotor.

[0008] In addition, the motor rotor according to the above embodiments of the present utility model may further have the following additional technical features:

[0009] Optionally, the concave portion is provided with a bottom surface and a side surface. The bottom surface is recessed with respect to the outer peripheral surface of the second portion, and the side surface connects the bottom surface and the outer peripheral surface of the second portion. Wherein, the side surface is configured to be inclined towards the second portion in the radially outward direction of the motor rotor, or the side surface is configured to extend along the radial direction of the motor rotor; and / or, the side surface is smoothly transitioned with the bottom surface and the outer peripheral surface of the second portion.

[0010] Optionally, the first portion is further provided with at least one convex portion. The at least one convex portion and the at least one concave portion are circumferentially distributed along the motor rotor. The concave portion is configured to be recessed radially with respect to the convex portion, and the balance hole is provided in the convex portion.

[0011] Optionally, the at least one concave portion and the at least one balance hole are staggeredly distributed along the circumference of the motor rotor.

[0012] Optionally, the minimum distance R1 between the concave portion and the axis of the motor rotor in the radial direction of the motor rotor, and the radial dimension R2 of the motor rotor satisfy 0.84 ≤ R1 / R2 ≤ 0.96.

[0013] Optionally, the dimension L1 of the concave portion in the circumferential direction of the motor rotor, and the circumference L2 of the circle where the outer peripheral surface of the motor rotor is located satisfy 0.3 ≤ L1 / L2 ≤ 0.7.

[0014] Optionally, the balance hole is configured to extend in a direction parallel to the axis of the motor rotor and penetrate through the end face of the motor rotor facing away from the second portion.

[0015] Optionally, the first portion and the second portion are configured as tubular shapes axially connected, and a plate portion is connected to the end of the first portion away from the second portion.

[0016] Optionally, the motor rotor further includes a rotating shaft. The plate portion is provided with a through hole, the rotating shaft is passed through the through hole, and at least one end face of the plate portion in the axial direction of the motor rotor is provided with a reinforcing rib surrounding the rotating shaft.

[0017] Optionally, the reinforcing rib includes a first rib portion and a second rib portion. The first rib portion and the second rib portion are distributed in a direction away from the axis of the motor rotor, and the surface of the first rib portion protrudes relative to the surface of the second rib portion in the axial direction to form a second dust-proof step.

[0018] Optionally, in the radial direction along the motor rotor, the ratio R3 / R2 of the radial dimension R3 of the balance hole to the radial dimension R2 of the motor rotor is not less than 0.006 and not greater than 0.08.

[0019] Optionally, in the circumferential direction along the motor rotor, the ratio L3 / L2 of the circumferential dimension L3 of the balance hole to the circumference L2 of the circle where the outer peripheral surface of the motor rotor is located is not less than 0.01 and not greater than 0.04.

[0020] Optionally, in the axial direction along the motor rotor, the ratio L4 / L5 of the axial dimension L4 of the balance hole to the axial dimension L5 of the motor rotor is not less than 0.15 and not greater than 0.35.

[0021] For the motor according to an embodiment of the present invention, the motor includes the motor rotor as described above.

[0022] For the motor according to an embodiment of the present invention, by applying the aforementioned motor rotor, dust prevention of the motor can be achieved at a lower cost without affecting the heat dissipation performance of the motor; and the motor rotor is provided with balance holes, and the balance correction of the motor rotor can be performed through the balance holes, improving the working stability of the motor. Description of the Drawings

[0023] Figure 1 is a schematic diagram of a motor rotor in some embodiments of the present invention.

[0024] Figure 2 is a front view of a motor rotor in some embodiments of the present invention.

[0025] Figure 3 is a schematic diagram of a motor rotor in some other embodiments of the present invention.

[0026] Figure 4 is a schematic diagram of the dimensions of a motor rotor in some embodiments of the present invention.

[0027] Figure 5 is a partial radial cross-sectional view of a motor rotor in some embodiments of the present invention.

[0028] Reference Signs:

[0029] Motor rotor 100, first part 10, recess 11, bottom surface 111, side surface 112, convex part 12, balance hole 121, plate part 13, second part 20, rotating shaft 30, reinforcing rib 40, first rib part 41, second rib part 42, axial direction A-A, circumferential direction B-B. Detailed Description of the Embodiments

[0030] Embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present utility model, and should not be construed as a limitation to the present utility model.

[0031] The present utility model provides a motor rotor 100 and a motor, which are configured with a first dust-proof step to intercept dust, thereby achieving dust-proofing of the motor without affecting the heat dissipation performance of the motor; and are provided with balance holes 121, through which the balance correction of the motor rotor 100 can be carried out to improve the balance of the motor rotor 100.

[0032] Referring to Figures 1 to 3 , according to the motor rotor 100 of the embodiment of the present utility model, at least one balance hole 121 is provided on the outer peripheral edge of the motor rotor 100. The motor rotor 100 includes a first part 10 and a second part 20 distributed along the axial direction. The first part 10 is provided with at least one recess 11, the recess 11 is recessed relative to the outer peripheral surface of the second part 20, and the inner surface of the recess 11 and the outer peripheral surface of the second part 20 cooperate to form a first dust-proof step arranged along the axial direction. At least one recess 11 and at least one balance hole 121 are distributed along the circumferential direction of the motor rotor 100; thus, the dust-proofing of the motor rotor 100 can be achieved, and the balance of the motor rotor 100 can be improved.

[0033] Specifically, due to the possible tolerance in the size of the motor rotor 100 or the asymmetry of the rotor itself, the rotor is prone to the phenomenon of unbalanced force during rotation. Therefore, at least one balance hole 121 is provided on the outer peripheral edge of the motor rotor 100, and balance pins or balance mud can be arranged in the balance holes 121 to carry out balance correction on the motor rotor 100; during calibration, the motor rotor 100 is corrected through the balance holes 121, which can avoid the protrusion of balance media such as balance mud or balance pins relative to the outer surface of the motor rotor 100, resulting in structural interference.

[0034] In addition, the motor rotor 100 cooperates with the motor stator to achieve the power output of the motor. Among them, in the axial direction, there is a gap between the second part 20 of the motor rotor 100 and the motor stator. When the motor is working, dust is likely to enter the motor interior through this gap, thus affecting the stable operation of the motor. Therefore, at least one convex portion 12 is provided on the first part 10 of the motor rotor 100. The convex portion 12 is recessed relative to the outer peripheral surface of the second part 20, so that the inner surface of the concave portion 11 cooperates with the outer peripheral surface of the second part 20 to construct the first dust-proof step of the axial part. When the dust approaches the gap between the motor rotor 100 and the motor stator, the dust is easily intercepted by the first dust-proof step on the outer peripheral surface of the motor rotor 100, thus achieving the dust-proof effect. Specifically, when the dust approaches the gap in multiple directions such as the axial direction, circumferential direction or radial direction, it can be intercepted by the first dust-proof step.

[0035] Therefore, the motor rotor 100 according to the embodiment of the present invention is constructed with the first dust-proof step, and the dust is intercepted by the first dust-proof step, so as to achieve the dust-proof of the motor without affecting the heat dissipation performance of the motor. And a balance hole 121 is provided, and the balance correction of the motor rotor 100 can be carried out through the balance hole 121 to improve the balance of the motor rotor 100.

[0036] Referring to Figures 1 to 3 , in some embodiments of the present invention, the concave portion 11 is provided with a bottom surface 111 and a side surface 112. The bottom surface 111 is recessed relative to the outer peripheral surface of the second part 20, and the side surface 112 connects the bottom surface 111 and the outer peripheral surface of the second part 20. Among them, the side surface 112 is set to be inclined towards the second part 20 in the radially outward direction of the motor rotor 100, or the side surface 112 is set to extend along the radial direction of the motor rotor 100. In this way, the dust-proof effect of the first dust-proof step can be improved.

[0037] Specifically, the bottom surface 111 is recessed with respect to the outer peripheral surface of the second part 20, and the bottom surface 111 and the outer peripheral surface of the second part 20 are connected by the side surface 112, so as to form a recess 11 in the first part 10 that is recessed with respect to the outer peripheral surface of the second part 20, which is used to intercept dust near the gap between the motor rotor 100 and the motor stator; optionally, the side surface 112 is inclined towards the second part 20 in the direction radially outward along the motor rotor 100. It can be understood that the side surface 112 has an angle with the radial direction of the motor rotor 100, and the side surface 112 has an angle with the axial direction of the motor rotor 100. When dust drifts from the radial and axial directions of the motor rotor 100 towards the gap, it can be intercepted by the side surface 112 of the recess 11, thereby achieving dust prevention for the motor; more specifically, when dust drifts towards the motor along the radial direction of the motor rotor 100, the dust can be deposited on the bottom surface 111 of the recess 11 under the guidance of the side surface 112 of the recess 11; or, when dust drifts towards the motor along the axial direction of the motor rotor 100, the dust can be deposited on the side surface 112 of the recess 11 under the guidance of the bottom surface 111 of the recess 11, thereby achieving dust prevention. Optionally, the side surface 112 extends along the radial direction of the motor rotor 100, which can improve the effect of intercepting dust by the first dust prevention step in the axial direction of the motor rotor 100; it can be understood that when the motor is arranged, the first part 10 and the second part 20 of the motor rotor 100 are arranged from top to bottom. At this time, the side surface 122 can face upwards, and the dust falling from a height can be intercepted by the first dust prevention step, thereby improving the dust prevention effect of the motor rotor 100.

[0038] In addition, the side surface 112 is smoothly transitioned with the bottom surface 111 and the outer peripheral surface of the second part 20; in this way, the stress concentration of the motor rotor 100 can be reduced, and the fatigue failure of the motor rotor 100 can be avoided; and the smooth transition of the bottom surface 111, the side surface 112, and the outer peripheral surface of the second part 20 can reduce the resistance when the motor rotor 100 rotates and improve the working performance of the motor.

[0039] In addition, in some specific examples, the bottom surface 111 of the recess 11 has an angle α with the axis of the motor rotor 100, and the side surface 112 of the recess 11 has an angle β with the axis of the motor rotor 100, where the angle α is not greater than the angle β, so as to form a recess 11 that can accommodate dust; further, the angle β is not less than 60° and not greater than 90°. In this way, the side surface 112 of the recess 11 can have angles with the axial and radial directions of the motor rotor 100 respectively, and can accommodate the dust floating from the axial or radial direction, thereby achieving dust prevention for the motor rotor 100.

[0040] Refer to Figures 1 to 3, in some embodiments of the present utility model, the first part 10 is further provided with at least one convex portion 12. At least one convex portion 12 and at least one concave portion 11 are circumferentially distributed along the motor rotor 100. The concave portion 11 is configured to be recessed radially relative to the convex portion 12 along the motor rotor 100, and a balance hole 121 is provided in the convex portion 12. In this way, the motor rotor 100 can achieve dust prevention and correction.

[0041] Specifically, the first part 10 is provided with at least one convex portion 12, and a balance hole 121 may be provided on the convex portion 12. In this way, it is possible to avoid setting the balance hole 121 on the original structure of the motor rotor 100, resulting in a decrease in the structural strength of the motor, and it is possible to avoid structures such as magnetic tiles in the motor rotor 100. The balance hole 121 can be used to fill balance mud or set balance pins, so as to achieve the dynamic balance correction of the motor rotor 100 and avoid uneven stress on the motor rotor 100. In addition, at least one convex portion 12 and at least one concave portion 11 are circumferentially distributed along the motor rotor 100, which can reduce the structural asymmetry of the motor rotor 100.

[0042] In addition, the outer surface of at least one convex portion 12 and the outer peripheral surface of the second part 20 may be located on the same curved surface. It can be understood that at least one concave portion 11 is recessed relative to the outer peripheral surface of the second part 20 and at least one convex portion 12, so as to improve the structural flatness of the outer peripheral surface of the motor rotor 100 and reduce the rotational resistance of the motor rotor 100.

[0043] Refer to Figures 1 to 3 , in some embodiments of the present utility model, at least one concave portion 11 and at least one balance hole 121 are circumferentially staggered along the motor rotor 100; optionally, a plurality of concave portions 11 are circumferentially distributed along the motor rotor 100, and a plurality of balance holes 121 are circumferentially distributed along the motor rotor 100. In this way, the structural asymmetry of the motor rotor 100 can be reduced, and the imbalance during the rotation of the motor rotor 100 can be avoided; further, a plurality of concave portions 11 and a plurality of balance holes 121 are staggered, so that a plurality of concave portions 11 and a plurality of balance holes 121 are more evenly distributed on the motor rotor 100, thereby avoiding uneven rotation of the motor rotor 100.

[0044] Refer to Figures 1 to 4 , in some embodiments of the present utility model, the minimum distance R1 between the concave portion 11 and the axis of the motor rotor 100 along the radial direction of the motor rotor 100, and the radial dimension R2 of the motor rotor 100 satisfy 0.84 ≤ R1 / R2 ≤ 0.96; in this way, the structural arrangement space of the motor rotor 100 and the dust prevention performance of the motor rotor 100 can be taken into account.

[0045] Specifically, in the radial direction of the motor rotor 100, the minimum distance between the concave portion 11 and the axis of the motor rotor 100 is R1, and R1 and the radial dimension R2 of the motor rotor 100 satisfy 0.84 ≤ R1 / R2 ≤ 0.96, so as to balance the structural layout space of the motor rotor 100 and the dust-proof performance of the motor rotor 100. It can be understood that if R1 / R2 < 0.84, in the radial direction of the motor rotor 100, the proportion of the concave portion 11 in the motor rotor 100 becomes smaller, resulting in a decrease in the space for the concave portion 11 to accommodate dust. If R1 / R2 > 0.95, since there are components such as magnets or iron cores in the motor rotor 100, increasing the proportion of the concave portion 11 in the radial direction of the motor rotor 100 will lead to a decrease in the layout space of other components in the motor rotor 100 and a reduction in the structural strength of the motor rotor 100, ultimately affecting the performance of the motor. Among them, R1 / R2 can be 0.84, 0.86, 0.90, 0.92, 0.96, etc.

[0046] Among them, in some specific examples, the outer diameter R2 of the motor rotor 100 can be 107 mm, and the radial dimension of the concave portion 11 can be 2 mm - 8 mm. In this way, R1 / R2 can be made to satisfy: 0.84 ≤ R1 / R2 ≤ 0.96.

[0047] Referring to Figure 4 , in some embodiments of the present utility model, the dimension L1 of the concave portion 11 in the circumferential direction of the motor rotor 100 and the circumference L2 of the circle where the outer peripheral surface of the motor rotor 100 is located satisfy 0.3 ≤ L1 / L2 ≤ 0.7; in this way, the structural layout space of the motor rotor 100 and the dust-proof performance of the motor rotor 100 can be balanced.

[0048] Specifically, in the circumferential direction of the motor rotor 100, the total arc length of the circle where the outer peripheral surface of the motor rotor 100 corresponding to at least one concave portion 11 is located is L1, and the circumference of the circle where the outer peripheral surface of the motor rotor 100 is located is L2, and 0.3 ≤ L1 / L2 ≤ 0.7 is satisfied, so as to balance the structural layout space of the motor rotor 100 and the dust-proof performance of the motor rotor 100. It can be understood that if L1 / L2 < 0.3, in the circumferential direction of the motor rotor 100, the proportion of the concave portion 11 in the motor rotor 100 becomes smaller, resulting in a decrease in the space for the concave portion 11 to accommodate dust. If L1 / L2 > 0.7, it will increase the proportion of the concave portion 11 in the circumferential direction of the motor rotor 100, resulting in a reduction in the structural strength of the motor rotor 100 and affecting the performance of the motor. Among them, L1 / L2 can be 0.3, 0.4, 0.5, 0.6, 0.7, etc.

[0049] Among them, the dimension of the concave portion 11 along the circumferential direction of the motor rotor 100 can be understood as the distance from one side to the other side of the concave portion 11 in the circumferential direction; in practice, the maximum value, minimum value or average value of the circumferential dimension of the concave portion 11 can be measured, and any one of the three values of the circumferential dimension of the concave portion 11 can be taken to meet the foregoing conditions; of course, the circumferential dimension of the balance hole 121 is the same, and will not be elaborated here.

[0050] Referring to Figures 1 to 3 , in some embodiments of the present invention, the balance hole 121 is arranged to extend along a direction parallel to the axis of the motor rotor 100 and penetrate through the end face of the motor rotor 100 facing away from the second part 20; in combination with the foregoing, it can be understood that there is a gap between the second part 20 of the motor rotor 100 and the motor stator. Therefore, the balance hole 121 can be opened on the end face of the motor rotor 100 facing away from the second part 20. In this way, it can be far away from the gap between the motor rotor 100 and the motor stator, avoiding the balance mud from blocking the gap and affecting the heat dissipation of the motor. In addition, the balance hole 121 extends along a direction parallel to the axis of the motor rotor 100. For example, if the axis of the motor rotor 100 diffracts in the up and down direction, the balance hole 121 also extends in the up and down direction, which can ensure that the rotation direction of the balance mud or balance pin is consistent with the rotation direction of the motor rotor 100, further improving the balance correction effect on the motor rotor 100, and can avoid the balance mud or balance pin falling off from the balance hole 121 when the motor rotor 100 rotates, improving the working stability of the motor rotor 100.

[0051] Referring to Figures 1 to 3 , in some embodiments of the present invention, the first part 10 and the second part 20 are arranged as tubular shapes connected axially, and the plate part 13 is connected to the end of the first part 10 away from the second part 20; specifically, the first part 10 is tubular, the second part 20 is tubular, the first part 10 and the second part 20 are arranged along the axis of the motor rotor 100, and a plate part 13 is provided at the end of the first part 10 away from the second part 20, so that the motor rotor 100 forms a structure with a hollow interior, one end open and the other end closed. The motor stator can be arranged inside the motor rotor 100 to form an outer rotor motor, and there is a gap between the motor stator and the end of the second part 20 away from the first part 10. This gap can be used for motor heat dissipation, and in combination with the foregoing concave portion 11, it can prevent dust from entering the interior of the motor through the gap and affecting the normal operation of the motor.

[0052] Referring to Figures 1 to 3, in some embodiments of the present utility model, the motor rotor 100 further includes a rotating shaft 30. The plate portion 13 is provided with a through hole, and the rotating shaft 30 passes through the through hole of the plate portion 13. At least one end face of the plate portion 13 along the axial direction of the motor rotor 100 is provided with a reinforcing rib 40, and the reinforcing rib 40 is arranged around the rotating shaft 30. Specifically, the plate portion 13 is provided with a through hole, and the rotating shaft 30 is arranged in the through hole. The rotating shaft 30 rotates with the motor rotor 100. Under the cooperation of the motor stator and the motor rotor 100, the kinetic energy output of the motor can be realized through the rotating shaft 30. Among them, a sleeve extending along the axial direction of the motor rotor 100 is connected to the periphery of the through hole, and the sleeve can be connected to the rotating shaft 30 to improve the connection strength between the plate portion 13 and the rotating shaft 30. In addition, at least one end face of the plate portion 13 along the axial direction is provided with a reinforcing rib 40, and the reinforcing rib 40 is arranged around the rotating shaft 30 to improve the structural strength of the plate portion 13. Among them, the reinforcing rib 40 can be a disc-shaped one extending along the circumferential direction of the motor rotor 100; or, the reinforcing rib 40 can also be a strip-shaped one extending along the radial direction of the motor rotor 100 and includes a plurality of them arranged around the rotating shaft 30 to improve the structural strength of the motor rotor 100, and the angle between adjacent reinforcing ribs 40 is not less than 15° and not more than 40°. If the angle between adjacent two reinforcing ribs 40 is less than 15°, the strengthening effect of the reinforcing rib 40 is limited and cannot meet the requirements; if the angle between adjacent two reinforcing ribs 40 is greater than 40°, the manufacturing cost will increase.

[0053] Further, the plate portion 13 is provided with a reinforcing rib 40 on the end face away from the second part 20 for dust prevention. Specifically, the reinforcing rib 40 includes a first rib portion 41 and a second rib portion 42. The first rib portion 41 and the second rib portion 42 are distributed along the direction away from the axis of the motor rotor 100, and the surface of the first rib portion 41 protrudes relative to the surface of the second rib portion 42 in the axial direction to form a second dust prevention step. In this way, when the motor rotor 100 is working, the dust floating towards the motor rotor 100 can be intercepted on the second dust prevention step, avoiding the dust from entering the motor through the gap between the plate portion 13 and the rotating shaft 30 and affecting the normal operation of the motor. Among them, the first rib portion 41 is a sleeve-shaped one extending along the circumferential direction of the motor rotor 100, and the second rib portion 42 is a strip-shaped one extending along the radial direction of the motor rotor 100 and includes a plurality of them. The plurality of second rib portions 42 are connected to the outer peripheral surface of the first rib portion 41, thereby improving the structural strength of the motor rotor 100.

[0054] Among them, the radial dimension of the first rib portion 41 along the motor rotor 100 is 1 mm - 3 mm, so as to balance the structural strength of the rib 40 and the injection molding effect of the rib 40. If the radial dimension of the first rib portion 41 is too small, the strength is limited; if it is too large, the initial internal stress of the first rib portion 41 is large, and the strength is reduced instead, affecting the injection molding effect. The axial dimension of the first rib portion 41 along the motor rotor 100 is 3 mm - 10 mm, so as to balance the fit with the rotating shaft 30 and the injection molding convenience. If the axial dimension of the first rib portion 41 is too small, the mating surface with the rotating shaft 30 is small, and the effect of enhancing the bonding force is limited; if it is too large, it is difficult to injection mold.

[0055] In addition, the radial dimension of the second rib portion 42 along the motor rotor 100 is 5 mm - 15 mm, and the axial dimension of the second rib portion 42 along the motor rotor 100 is 0.5 mm - 2.5 mm, so as to balance the structural strength of the rib 40 and the manufacturing cost. If the radial dimension of the second rib portion 42 is too small, the strength is limited; if it is too large, it will waste materials and increase the manufacturing cost.

[0056] Referring to Figure 4 and Figure 5 In some embodiments of the present invention, in the radial direction along the motor rotor 100, the ratio R3 / R2 of the radial dimension R3 of the balance hole 121 to the radial dimension R2 of the motor rotor 100 is not less than 0.006 and not greater than 0.08. Specifically, if the ratio is less than 0.006, the space for placing the balance pin and balance clay in the balance hole 121 is small, and the correction effect on the motor rotor 100 is limited; if the ratio is greater than 0.08, the space in the balance hole 121 is wasted, and the structural layout of the motor rotor 100 is affected. Among them, the ratio of the radial dimension of the balance hole 121 to the radial dimension of the first part 10 can be 0.006, 0.010, 0.02, 0.06, 0.08, etc.

[0057] Referring to Figure 4 and Figure 5 In some embodiments of the present invention, in the circumferential direction along the motor rotor 100, the ratio L3 / L2 of the circumferential dimension L3 of the balance hole 121 to the circumference L2 of the circle where the outer peripheral surface of the motor rotor 100 is located is not less than 0.01 and not greater than 0.04. Specifically, if the ratio is less than 0.01, the space for placing the balance pin and balance clay in the balance hole 121 is small, and the correction effect on the motor rotor 100 is limited; if the ratio is greater than 0.04, the space in the balance hole 121 is wasted, and the structural layout of the motor rotor 100 is affected. Among them, the ratio of the circumferential dimension of the balance hole 121 to the circumferential dimension of the first part 10 can be 0.01, 0.020, 0.025, 0.030, 0.04, etc.

[0058] Referring to Figure 4 andFigure 5 , in some embodiments of the present utility model, in the axial direction of the motor rotor 100, the ratio L4 / L5 of the axial dimension L4 of the balance hole 121 to the axial dimension L5 of the motor rotor 100 is not less than 0.15 and not greater than 0.35; specifically, if the ratio is less than 0.15, the space of the balance hole 121 is too small, and there is a risk that the balance pin or balance mud in the balance hole 121 may fall out; if the ratio is greater than 0.35, the space of the balance hole 121 is too large, resulting in waste and affecting the structural arrangement of the motor rotor 100. Among them, in the axial direction of the motor rotor 100, the ratio of the axial dimension of the balance hole 121 to the axial dimension of the motor rotor 100 can be 0.15, 0.2, 0.25, 0.3, 0.35, etc.

[0059] Refer to Figures 1 to 3 , according to the motor of the embodiment of the present utility model, the motor includes the motor rotor 100 in the above embodiment. By applying the aforementioned motor rotor 100, the dust prevention of the motor can be realized at a lower cost without affecting the heat dissipation performance of the motor; and the motor rotor 100 is provided with a balance hole 121, and the balance hole 121 can be used to correct the balance of the motor rotor 100, improving the working stability of the motor.

[0060] Specifically, the motor rotor 100 includes a first part 10 and a second part 20 distributed axially. The first part 10 is provided with at least one concave part 11 and at least one convex part 12, and at least one convex part 12 and at least one concave part 11 are distributed alternately around the circumference of the motor rotor 100 to improve the structural uniformity of the motor rotor 100 and reduce the imbalance of the motor rotor 100; among them, the concave part 11 is provided with a bottom surface 111 and a side surface 112. The bottom surface 111 is recessed relative to the outer peripheral surface of the second part 20, and the side surfaces 112 are respectively connected to the bottom surface 111 and the outer peripheral surface of the second part 20 to form a first dust-proof step arranged axially; when dust drifts towards the motor, the first dust-proof step of the motor rotor 100 can intercept the dust and prevent the dust from entering the gap between the motor rotor 100 and the motor stator, resulting in unstable operation of the motor. In addition, a balance hole 121 is provided in the convex part 12. By setting a balance pin or balance mud in the balance hole 121, the balance of the motor rotor 100 can be corrected to avoid uneven force when the motor rotor 100 rotates.

[0061] Further, the side surface 112 of the concave portion 11 inclines towards the second portion 20 in the radially outward direction of the motor rotor 100, so that an included angle can be formed between the side surface 112 of the concave portion 11 and the radial direction and the axial direction of the motor rotor 100 respectively, thereby better intercepting the dust floating from the radial direction or the axial direction and improving the dust-proof effect of the motor rotor 100. In addition, the side surface 112 of the concave portion 11 and the bottom surface 111 of the concave portion 11 and the outer peripheral surface of the second portion 20 are in smooth transition, thereby reducing the stress concentration of the motor rotor 100 and reducing the resistance during the rotation of the motor rotor 100, and improving the working performance of the motor. In addition, the balance hole 121 extends along the direction parallel to the axis of the motor rotor 100 and penetrates through the end surface of the motor rotor 100 facing away from the second portion 20, which can prevent the balance clay or the balance nail from falling out of the balance hole 121 when the motor rotor 100 rotates, and improve the stability of the dynamic balance correction of the motor rotor 100.

[0062] Furthermore, the minimum distance R1 between the concave portion 11 and the axis of the motor rotor 100 and the radial dimension R2 of the motor rotor 100 satisfy: 0.84 ≤ R1 / R2 ≤ 0.96; and the dimension L1 of the concave portion 11 in the circumferential direction of the motor rotor 100 and the circumference L2 of the circle where the outer peripheral surface of the motor rotor 100 is located satisfy 0.3 ≤ L1 / L2 ≤ 0.7; in this way, the structural arrangement space of the motor rotor 100 and the dust-proof performance of the motor rotor 100 can be taken into account.

[0063] In addition, in the radial direction along the motor rotor 100, the ratio of the radial dimension of the balance hole 121 to the radial dimension of the first portion 10 is not less than 0.006 and not greater than 0.08; and in the circumferential direction along the motor rotor 100, the ratio of the circumferential dimension of the balance hole 121 to the circumferential dimension of the first portion 10 is not less than 0.01 and not greater than 0.04; and in the axial direction along the motor rotor 100, the ratio of the circumferential dimension of the balance hole 121 to the circumferential dimension of the first portion 10 is not less than 0.15 and not greater than 0.35; in this way, the dynamic balance correction requirements of the motor rotor 100 can be met, and the space waste of the balance hole 121 can be avoided.

[0064] Still further, the plate portion 13 of the motor rotor 100 is provided with a reinforcing rib 40, and the reinforcing rib 40 is arranged around the rotating shaft 30 to improve the structural strength of the motor rotor 100.

[0065] In some specific examples of the present utility model, taking an outer-rotor motor as an example, the outer diameter surface of the motor is mainly on the rotor. A plurality of balance holes 121 are circumferentially and evenly distributed on the rotor near the outer diameter surface, and the gaps between the hole walls of the plurality of balance holes 121 are hollowed out, thereby forming a stepped effect for accommodating dust here. At the same time, in order to better adsorb dust, the diameter of the global or local shaft extension section (i.e., the first part 10) of the motor rotor 100 can be made smaller than the diameter of the non-shaft extension section (i.e., the second part 20), that is, the concave surface of the surface step faces the shaft extension section. When dust approaches the motor from the shaft extension section, the step surface can form an effective blocking effect. In addition, in addition to the two-stage type, a multi-stage step can also be designed on the outer surface of the motor to further enhance the dust-proof effect. In addition, a reinforcing rib 40 can be provided on the side of the rotor shaft and divided into two parts, an inner ring and an outer ring, so that its diameter changes suddenly at the junction of the inner and outer rings, thereby forming a first dust-proof step. The outer ring reinforcing rib 40 can be a strip structure evenly distributed in the circumferential direction or a circular ring structure continuous in the circumferential direction.

[0066] In addition, in order to improve the correction effect of the dynamic balance clay, the acting force arm of the clay during the rotation of the motor should be increased as much as possible, such as being arranged on the outer diameter of the rotor. By designing a series of evenly distributed holes on the outer diameter of the rotor, space is reserved for filling the dynamic balance clay. The specific size of the holes can be designed according to the actual unbalance requirement of the rotor and the structural space of the rotor. In order to ensure to the greatest extent that the dynamic balance clay will not be thrown out of the holes during the operation of the motor, the outlet of the holes can face the axial direction of the motor.

[0067] In the description of the present utility model, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0068] In the present utility model, unless otherwise clearly specified and limited, the terms "mounted", "connected", "connected to", "fixed" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0069] In the present utility model, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "below" and "beneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is less than that of the second feature.

[0070] In the description of this specification, the descriptions with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, parts, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Moreover, the specific features, parts, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples.

[0071] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present utility model.

Claims

1. A motor rotor, characterized in that: The outer periphery of the motor rotor is provided with at least one balancing hole (121), and the motor rotor comprises a first part (10) and a second part (20) distributed along the axial direction, the first part (10) is provided with at least one recess (11), the recess (11) is recessed relative to the outer peripheral surface of the second part (20), and the inner surface of the recess (11) cooperates with the outer peripheral surface of the second part (20) to form a first dust-proof step arranged along the axial direction, and the at least one recess (11) and the at least one balancing hole (121) are distributed along the circumference of the motor rotor.

2. The motor rotor according to claim 1, characterized in that: The recess (11) is provided with a bottom surface (111) and a side surface (112), the bottom surface (111) is recessed relative to the outer peripheral surface of the second part (20), and the side surface (112) connects the bottom surface (111) and the outer peripheral surface of the second part (20), The side surface (112) is arranged to be inclined toward the second part (20) in a radially outward direction of the motor rotor, or the side surface (112) is arranged to extend along the radial direction of the motor rotor; and / or the side surface (112) smoothly transitions with the bottom surface (111) and the outer peripheral surface of the second part (20).

3. The motor rotor according to claim 1, characterized in that: The first part (10) is further provided with at least one convex portion (12), the at least one convex portion (12) and the at least one concave portion (11) are distributed along the circumference of the motor rotor, the concave portion (11) is configured to be recessed relative to the convex portion (12) along the radial direction of the motor rotor, and the balancing hole (121) is provided on the convex portion (12).

4. The motor rotor according to claim 1, characterized in that: The at least one recess (11) and the at least one balancing hole (121) are staggeredly distributed along the circumferential direction of the motor rotor.

5. The motor rotor according to claim 1, characterized in that: The minimum distance R1 between the recess (11) and the axis of the motor rotor in the radial direction of the motor rotor and the radial dimension R2 of the motor rotor satisfy 0.84≤R1 / R2≤0.

96.

6. The motor rotor according to claim 1, characterized in that: The dimension L1 of the recess (11) along the circumference of the motor rotor and the circumference L2 of the circle where the outer peripheral surface of the motor rotor is located satisfy 0.3≤L1 / L2≤0.

7.

7. The motor rotor according to claim 1, characterized in that: The balancing hole (121) is arranged to extend in a direction parallel to the axis of the motor rotor and penetrate the end surface of the motor rotor that faces away from the second part (20).

8. The motor rotor according to claim 1, characterized in that: The first part (10) and the second part (20) are configured to be cylindrical and connected along the axial direction, and a plate part (13) is connected to an end of the first part (10) away from the second part (20).

9. The motor rotor according to claim 8, characterized in that: The motor rotor further comprises a rotating shaft (30), the plate portion (13) is provided with a through hole, the rotating shaft (30) is passed through the through hole, and the plate portion (13) is provided with a reinforcing rib (40) along at least one end face of the motor rotor in the axial direction, and the reinforcing rib (40) surrounds the rotating shaft (30).

10. The motor rotor according to claim 9, characterized in that: The reinforcing rib (40) comprises a first rib portion (41) and a second rib portion (42), wherein the first rib portion (41) and the second rib portion (42) are distributed in a direction away from the axis of the motor rotor, and the first rib portion (41) is axially protruding relative to the surface of the second rib portion (42) to form a second dust-proof step.

11. The motor rotor according to claim 1, characterized in that: In the radial direction of the motor rotor, a ratio R3 / R2 of a radial dimension R3 of the balancing hole (121) to a radial dimension R2 of the motor rotor is not less than 0.006 and not greater than 0.08; and / or, along the circumference of the motor rotor, a ratio L3 / L2 of a circumferential dimension L3 of the balancing hole (121) to a circumference L2 of a circle where an outer peripheral surface of the motor rotor is located is not less than 0.01 and not greater than 0.04; And / or, in the axial direction of the motor rotor, a ratio L4 / L5 of an axial dimension L4 of the balancing hole (121) to an axial dimension L4 of the motor rotor is not less than 0.15 and not greater than 0.

35.

12. A motor, characterized in that: The invention comprises the motor rotor according to any one of claims 1 to 11.

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