Frameless motor

Abstract

The utility model belongs to the technical field of motors, and discloses a frameless motor. The frameless motor specifically comprises a motor shaft, a motor rotor, a motor stator and fan blades. The motor stator is arranged on the periphery of the motor rotor. The motor shaft is provided with a first shaft part and a second shaft part in the axial direction of the motor shaft. The motor rotor is located on the periphery of the motor shaft and arranged on the first shaft part. The fan blades are arranged on the second shaft part, and at least part of the fan blades are located in the motor stator. The motor stator is kept fixed, the motor rotor rotates in the motor stator, the motor rotor drives the motor shaft to rotate, the motor shaft drives the fan blades to rotate, the fan blades directly blow air to the motor shaft, the motor rotor and the motor stator for heat dissipation, heat in the motor stator is discharged in time, and the heat dissipation effect of the frameless motor is improved. And the risk of high temperature rise of the frameless motor is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a frameless motor. Background Art

[0002] A frameless motor is a variant of a traditional motor and is widely used in the field of robotics. The frameless motor retains the rotor and stator used to generate torque and speed in the traditional motor, but does not have bearings, a housing, or end caps, etc. It has a small volume and a compact structure.

[0003] However, with the increase in the rotational speed and other performance of the frameless motor, the heat generation problem of the frameless motor with a small volume has gradually become serious, which instead affects the lifespan of the frameless motor. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a frameless motor, improve the heat dissipation effect of the frameless motor, and reduce the risk of a relatively high temperature rise of the frameless motor.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] A frameless motor, comprising:

[0007] A motor shaft, which has a first shaft portion and a second shaft portion along its axial direction;

[0008] A motor rotor, which is located on the outer periphery of the motor shaft and is arranged on the first shaft portion;

[0009] A motor stator, which is arranged on the outer periphery of the motor rotor;

[0010] A fan blade, which is arranged on the second shaft portion and at least partially located inside the motor stator.

[0011] As an optional embodiment of the above frameless motor, the fan blade includes a blade and an annular member, the blade is arranged on the annular member, and the annular member is sleeved and fixed on the second shaft portion.

[0012] As an optional embodiment of the above frameless motor, a plurality of the blades are arranged at intervals in the circumferential direction on the annular member.

[0013] As an optional embodiment of the above frameless motor, the blade is coplanar with the axis of the motor shaft.

[0014] As an optional embodiment of the above frameless motor, a limiting ring is arranged on the annular member, a limiting step is arranged on the second shaft portion, and one side of the limiting ring facing the first shaft portion abuts against the limiting step.

[0015] As an alternative embodiment of the frameless motor described above, the motor shaft further includes an output shaft portion, and the output shaft portion is connected to an end of the first shaft portion away from the second shaft portion.

[0016] As an alternative embodiment of the frameless motor described above, a plurality of recessed connection portions are provided on an end face of the output shaft portion away from the second shaft portion.

[0017] As an alternative embodiment of the frameless motor described above, a bearing is provided on the output shaft portion, and a limiting flange protruding outward is provided at an end of the output shaft portion away from the second shaft portion.

[0018] As an alternative embodiment of the frameless motor described above, the outer diameter of the output shaft portion is larger than the outer diameter of the first shaft portion, so as to form a first positioning step at the connection.

[0019] As an alternative embodiment of the frameless motor described above, the first shaft portion is connected to the second shaft portion, and the outer diameter of the first shaft portion is larger than the outer diameter of the second shaft portion, so as to form a second positioning step at the connection.

[0020] Advantages of the present utility model:

[0021] For the frameless motor provided by the present utility model, the motor stator remains fixed, the motor rotor rotates within the motor stator, the motor rotor drives the motor shaft to rotate, the motor shaft drives the fan blade to rotate, the fan blade directly blows air to cool the motor shaft, the motor rotor and the motor stator, and timely discharges the heat inside the motor stator, improving the heat dissipation effect of the frameless motor and reducing the risk of high temperature rise of the frameless motor. Description of the drawings

[0022] Figure 1 is a schematic structural diagram of a frameless motor applied to a robot joint provided by an embodiment of the present utility model;

[0023] Figure 2 is a schematic structural diagram of a fan blade provided by an embodiment of the present utility model;

[0024] Figure 3 is a schematic structural diagram of a motor shaft provided by an embodiment of the present utility model.

[0025] In the figure:

[0026] 100, joint housing; 103, reducer seal cover;

[0027] 1, motor rotor; 2, motor stator;

[0028] 3, motor shaft; 31, first shaft portion; 32, second shaft portion; 33, output shaft portion; 34, recessed connection portion; 35, limiting flange; 36, first positioning step; 37, second positioning step; 38, limiting step;

[0029] 4. Fan blade; 41. Blade; 42. Ring piece; 43. Limit ring;

[0030] 5. Bearing. Specific embodiments

[0031] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. Additionally, it should be noted that for the sake of description, only the parts related to the present utility model rather than all the structures are shown in the accompanying drawings.

[0032] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall 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 communication inside two elements or the interaction relationship between two elements. 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 circumstances.

[0033] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on" the second feature includes that the first feature is directly above and 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 "below", "under", and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0034] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meanings.

[0035] This embodiment provides a frameless motor. The frameless motor can be applied to a robot joint. As Figure 1 shown, the frameless motor specifically includes a motor shaft 3, a motor rotor 1, a motor stator 2, and a fan blade 4.

[0036] The motor stator 2 is arranged on the outer periphery of the motor rotor 1. The motor shaft 3 has a first shaft portion 31 and a second shaft portion 32 along its axial direction. The motor rotor 1 is located on the outer periphery of the motor shaft 3 and is arranged on the first shaft portion 31. The fan blade 4 is arranged on the second shaft portion 32, and at least part of the fan blade 4 is located inside the motor stator 2.

[0037] For the frameless motor provided in this embodiment, the motor stator 2 remains fixed, the motor rotor 1 rotates inside the motor stator 2, the motor rotor 1 drives the motor shaft 3 to rotate, the motor shaft 3 drives the fan blade 4 to rotate, and the fan blade 4 directly blows air to cool the motor shaft 3, the motor rotor 1 and the motor stator 2, and timely discharges the heat inside the motor stator 2, improving the heat dissipation effect of the frameless motor and reducing the risk of high temperature rise of the frameless motor.

[0038] In this embodiment, the motor rotor 1 is sleeved and adhesively fixed on the first shaft portion 31 through a rotor spacer sleeve. The specific structures of the motor stator 2 and the motor rotor 1 of the frameless motor can refer to the prior art and will not be elaborated here.

[0039] As Figure 1 shown, optionally, the fan blade 4 is arranged adjacent to the motor rotor 1, and the fan blade 4 is completely located inside the motor stator 2, saving space and being beneficial to heat dissipation inside the motor stator 2.

[0040] As Figure 2 shown, optionally, the fan blade 4 includes blade 41 and annular part 42, the blade 41 is arranged on the annular part 42, and the annular part 42 is sleeved and fixed on the second shaft portion 32. The fan blade 4 is installed on the motor shaft 3 through its annular part 42, and the installation is convenient. When the motor shaft 3 rotates, the blade 41 rotates accordingly to achieve heat dissipation. The fixing method of the annular part 42 on the second shaft portion 32 can be adhesive fixing.

[0041] As Figure 2 shown, optionally, a plurality of blades 41 are arranged at intervals along the circumferential direction on the annular part 42. The plurality of blades 41 further improves the heat dissipation effect and reduces the risk of high temperature rise of the frameless motor. In this embodiment, the blades 41 are evenly distributed along the circumferential direction.

[0042] As Figure 2 shown, optionally, the blade 41 is coplanar with the axis of the motor shaft 3, and the blade 41 is perpendicular to its rotation direction at any position in the circumferential direction, and the heat dissipation effect is good.

[0043] As Figure 2As shown, optionally, a limiting ring 43 is provided on the annular member 42, and a limiting step 38 is provided on the second shaft portion 32. One side of the limiting ring 43 facing the first shaft portion 31 abuts against the limiting step 38. By the mutual abutment of the limiting step 38 and the limiting ring 43, it is convenient to install and position the fan blade 4. Specifically, the limiting ring 43 protrudes inward from the annular member 42 towards the inner circumference. During installation, the annular member 42 is sleeved onto the second shaft portion 32 from the end far away from the first shaft portion 31 until the limiting ring 43 abuts against the limiting step 38.

[0044] In this embodiment, the limiting ring 43, the annular member 42, and the blade 41 are integrally formed structures, with high strength and not easily damaged.

[0045] As Figure 3 shown, optionally, the motor shaft 3 further includes an output shaft portion 33, and the output shaft portion 33 is connected to one end of the first shaft portion 31 far away from the second shaft portion 32. The output shaft portion 33 is used to output the power of the motor shaft 3 to the component to be driven. In this embodiment, the output shaft portion 33 is connected to the input end of the speed reducer.

[0046] As Figure 3 shown, optionally, a plurality of recessed connecting portions 34 are provided on the end face of the output shaft portion 33 far away from the second shaft portion 32. By using fasteners such as bolts and screws to connect with the recessed connecting portions 34, the component to be driven can be fixedly connected to the output shaft portion 33, and the connection is compact. In this embodiment, the recessed connecting portion 34 is a threaded hole.

[0047] As Figure 1 and Figure 3 shown, optionally, a bearing 5 is provided on the output shaft portion 33, and a limiting flange 35 protruding outward is provided at one end of the output shaft portion 33 far away from the second shaft portion 32. The limiting flange 35 is used to limit the bearing 5. The inner ring of the bearing 5 is sleeved and fixed on the output shaft portion 33, and the outer ring is connected to the speed reducer seal cover. The speed reducer seal cover is used to seal the cavity between the steel wheel and the flexible wheel of the harmonic speed reducer. In this embodiment, the bearing 5 is a deep groove ball type.

[0048] As Figure 3 shown, optionally, the outer diameter of the output shaft portion 33 is greater than the outer diameter of the first shaft portion 31, so as to form a first positioning step 36 at the connection between the output shaft portion 33 and the first shaft portion 31. The first positioning step 36 distinguishes the first shaft portion 31 from the output shaft portion 33, facilitating the assembly operation, and the first positioning step 36 also positions the motor rotor 1, facilitating positioning.

[0049] As Figure 3As shown, optionally, the first shaft portion 31 is directly connected to the second shaft portion 32, and the outer diameter of the first shaft portion 31 is larger than that of the second shaft portion 32, so as to form a second positioning step 37 at the connection between the first shaft portion 31 and the second shaft portion 32. The second positioning step 37 differentiates the first shaft portion 31 from the second shaft portion 32, facilitating the assembly operation. The second positioning step 37 also positions the fan blade 4, facilitating the assembly positioning.

[0050] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A frameless motor, characterized in that: include: A motor shaft (3), wherein the motor shaft (3) has a first shaft portion (31) and a second shaft portion (32) along its axial direction; A motor rotor (1), the motor rotor (1) being located on the outer periphery of the motor shaft (3) and arranged on the first shaft portion (31); A motor stator (2), wherein the motor stator (2) is arranged on the outer periphery of the motor rotor (1); A fan blade (4), wherein the fan blade (4) is arranged on the second shaft portion (32) and is at least partially located inside the motor stator (2).

2. The frameless motor according to claim 1, characterized in that: The fan blade (4) comprises a blade (41) and an annular component (42); the blade (41) is arranged on the annular component (42); and the annular component (42) is sleeved and fixed on the second shaft portion (32).

3. The frameless motor according to claim 2, characterized in that: A plurality of blades (41) are arranged on the annular member (42) at intervals in the circumferential direction.

4. The frameless motor according to claim 2, characterized in that: The blade (41) is coplanar with the axis of the motor shaft (3).

5. The frameless motor according to claim 2, characterized in that: A limiting ring (43) is provided on the annular member (42), a limiting step (38) is provided on the second shaft portion (32), and a side of the limiting ring (43) facing the first shaft portion (31) abuts against the limiting step (38).

6. The frameless motor according to claim 1, characterized in that: The motor shaft (3) further comprises an output shaft portion (33), wherein the output shaft portion (33) is connected to an end of the first shaft portion (31) away from the second shaft portion (32).

7. The frameless motor according to claim 6, characterized in that: A plurality of recessed connecting portions (34) are provided on the end surface of the output shaft portion (33) away from the second shaft portion (32).

8. The frameless motor according to claim 6, characterized in that: A bearing (5) is provided on the output shaft portion (33), and a limiting flange (35) protruding toward the outer circumference is provided at one end of the output shaft portion (33) away from the second shaft portion (32).

9. The frameless motor according to claim 6, characterized in that: The outer diameter of the output shaft portion (33) is greater than the outer diameter of the first shaft portion (31), and a first positioning step (36) is formed at the connection between the output shaft portion (33) and the first shaft portion (31).

10. The frameless motor according to any one of claims 1 to 9, characterized in that: The first shaft portion (31) is connected to the second shaft portion (32); the outer diameter of the first shaft portion (31) is greater than the outer diameter of the second shaft portion (32); and a second positioning step (37) is formed at the connection between the first shaft portion (31) and the second shaft portion (32).

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