Integrated thermal expansion prevention rotor structure

Abstract

The utility model belongs to the technical field of motors, and particularly relates to an integrated thermal expansion prevention rotor structure, which comprises a magnetic conductive ring, a magnet ring sleeved outside the magnetic conductive ring, a shaft sleeve arranged in the magnetic conductive ring, a rotating shaft sleeved on the shaft sleeve, and an expansion counteracting structure arranged on the magnetic conductive ring and used for counteracting thermal expansion of the rotating shaft. When the motor generates heat in the working process to cause the inner shaft to expand, the expansion counteracting structure on the magnetic conductive ring is not a rigid whole any more, but forms a flexible structure similar to elasticity. The magnetic conductive ring can adapt to the increase of the diameter of the rotating shaft through the expansion counteracting structure, so that rigid extrusion is avoided, the magnetic conductive ring and the magnet ring cannot be deformed, damaged or burst, and the service life of the motor cannot be influenced by wall-hanging friction between the magnetic conductive ring and the outer stator due to deformation.

Description

TECHNICAL FIELD

[0001] The utility model belongs to motor technical field especially relates to an integrated heat expansion rotor structure. BACKGROUND

[0002] Motor, commonly known as "motor", refers to the electromagnetic device according to electromagnetic induction law realizes electric energy conversion or transmission, the rotor of the existing motor. The part of robot motor is its rotating part, it is responsible for the interaction with the stator of robot motor to convert electric power into mechanical force, thereby driving the movement of robot, and the outer rotor of robot motor refers to the part of the rotor that can be exposed, the rotor part of the motor is located outside the motor, rotates around the stator, this kind of motor is also commonly known as coreless motor, the outer rotor motor is generally applied in high-speed, high-precision application field, such as robot, industrial automation, medical equipment and so on.

[0003] As the utility model discloses a robot motor rotor, including: motor outer rotor, the outside of the motor outer rotor is connected with the bead, the motor outer rotor includes rotor body, the inside of the rotor body is equipped with the top end clamping groove, and the surface of top end clamping groove is connected with the primary clamping ring, and the inside of the primary clamping ring is equipped with the secondary clamping groove, the surface of the secondary clamping groove is provided with the middle part action plate, and the inside of the middle part action plate is equipped with the inside clamping groove, and the side of the bead is provided with the magnetic steel adhesion area. Through the setting motor outer rotor, the top end clamping groove and the secondary clamping groove in the rotor body provide space conditions for subsequent installation, and the middle part action plate and the inside clamping groove make the whole motor outer rotor can be installed according to the specific use environment, facilitate the use of cooperation, provide a kind of outer rotor device for robot motor, provide the condition of flexible adjustment, improve use efficiency and use experience.

[0004] In the rotor structure, the gap between the rotor and the stator is called air gap, the smaller the air gap, the greater the torque, in the motor in the field of robot, in order to reduce the air gap, but the motor will heat up in work, resulting in the expansion of the inner shaft, thereby affecting the deformation damage or burst of the outer side magnetic ring and the magnet ring, and because the air gap is too small, it will also be hung wall friction between the outer stator, affect the service life of the motor. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a kind of integrated heat expansion rotor structure, aims at solving the problem of "motor in work will heat up, resulting in the expansion of the inner shaft, thereby affecting the deformation damage or burst of the outer side magnetic ring and the magnet ring, and because the air gap is too small, it will also be hung wall friction between the outer stator, affect the service life of the motor" in the above background art.

[0006] To achieve the above object, the utility model discloses an integrated heat expansion prevention rotor structure, including the magnetic ring, the magnetic ring is equipped with the magnet ring, the magnetic ring is equipped with the shaft sleeve, the shaft sleeve is covered in a rotating shaft, the magnet ring is integrally formed and is arranged, the magnetic ring is equipped with expansion offset structure, and the expansion offset structure is used to offset the thermal expansion of the rotating shaft.

[0007] Optionally, the expansion offset structure is a plurality of expansion grooves, and the plurality of expansion grooves are uniformly arranged circumferentially around the magnetic ring.

[0008] Optionally, the expansion offset structure is a plurality of expansion groove groups, and the plurality of expansion groove groups are uniformly arranged circumferentially around the magnetic ring.

[0009] Optionally, each expansion groove group includes a first groove and a second groove arranged perpendicularly to the circumferential direction; the first groove and the second groove are arranged in a cross manner, one end of the first groove and the second groove is communicated to an end of the magnetic ring, and the other end is not communicated to the other end of the magnetic ring; and the first groove and the second groove are through grooves.

[0010] Optionally, each expansion groove group includes a first groove and a second groove arranged perpendicularly to the circumferential direction; the first groove and the second groove are arranged on the same straight line, one end of the first groove and the second groove is respectively communicated to an end of the magnetic ring, and the other end is not communicated to each other, and the first groove and the second groove are through grooves.

[0011] Optionally, each expansion groove group further includes a third groove arranged perpendicularly to the circumferential direction; both ends of the third groove are not communicated to the end of the magnetic ring, and the third groove is a through groove.

[0012] Optionally, the shaft sleeve is made of lightweight and low-expansion coefficient material.

[0013] Optionally, the material of the shaft sleeve includes one of plastic, carbon fiber, ceramic, aluminum alloy and titanium alloy.

[0014] Compared with the prior art, the one or more technical solutions of the integrated heat expansion prevention rotor structure provided by the utility model embodiment at least have one of the following technical effects:

[0015] By arranging the expansion offset structure, the thermal expansion of the rotating shaft is offset, when the motor heats up and causes the inner shaft to expand during operation, the expansion offset structure on the magnetic ring is no longer rigid as a whole, but forms a flexible structure similar to elasticity. The magnetic ring can adapt to the increase of the diameter of the rotating shaft through the expansion offset structure, avoid hard extrusion, so that the magnetic ring and the magnet ring will not be deformed and damaged or burst, and will not be deformed and rub against the outer stator, affecting the service life of the motor. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] Figure 2 This is a schematic diagram of the exploded structure of this utility model.

[0019] Figure 3 This is a schematic diagram of the assembled segmented magnet ring structure of this utility model.

[0020] Figure 4 This is a schematic diagram of the magnetic ring structure according to an embodiment of the present invention.

[0021] Figure 5 This is a schematic diagram of the magnetic ring structure according to another embodiment of the present invention.

[0022] Figure 6 This is a schematic diagram of the magnetic ring structure according to another embodiment of the present invention.

[0023] The following are the labeling elements in the figure:

[0024] 100. Outer shell; 110. Mounting cavity; 120. Shaft; 121. First slot; 130. Front cover; 131. Inner edge; 132. Placement position; 133. Heat dissipation hole; 140. Rear cover; 150. Shaft hole; 160. Bearing; 170. Gear; 171. Second slot; 180. Positioning component;

[0025] 200. Stator assembly; 210. Circuit board;

[0026] 300, Rotor assembly; 310, Magnetic ring; 311, Expansion groove group; 3111, First groove; 3112, Second groove; 3113, Third groove; 312, Expansion groove; 320, Magnet ring; 330, Bushing. Detailed Implementation

[0027] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein 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 with reference to the accompanying drawings are exemplary and intended to explain the embodiments of the present invention, and should not be construed as limiting the present invention.

[0028] In the description of the embodiments of the utility model, it needs to be understood that the directions or position relations indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are the directions or position relations shown based on the drawings, and are only for the convenience of describing the embodiments of the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the utility model.

[0029] In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the embodiments of the utility model, the meaning of "multiple" is two or more than two, unless otherwise specifically limited.

[0030] In the embodiments of the utility model, unless otherwise specifically specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication inside two elements or the interaction relationship between two elements. For ordinary skilled persons in the art, the specific meaning of the above terms in the embodiments of the utility model can be understood according to the specific circumstances.

[0031] In one embodiment of the utility model, according to Figures 1-6 As shown in the figure, it comprises a shell 100;The shell 100 is provided with a mounting cavity 110, the mounting cavity 110 is provided with a stator assembly 200, the stator assembly 200 is provided with a rotor assembly 300, the rotor assembly 300 comprises a magnetic conductive ring 310, the magnetic conductive ring 310 is provided with a magnet ring 320, the magnetic conductive ring 310 is provided with a shaft sleeve 330, the shaft sleeve 330 is sleeved on a rotating shaft 120, the magnetic conductive ring 310 is provided with an expansion compensation structure, and the expansion compensation structure is used to offset the thermal expansion of the rotating shaft 120.

[0032] Specifically, by setting the expansion compensation structure, the thermal expansion of the rotating shaft 120 is offset, when the motor heats up and causes the inner shaft to expand during operation, the expansion compensation structure on the magnetic conductive ring 310 is no longer rigid as a whole, but forms a flexible structure similar to elasticity. The magnetic conductive ring 310 can adapt to the increase of the diameter of the rotating shaft 120 through the expansion compensation structure, avoid hard extrusion, so that the magnetic conductive ring 310 and the magnet ring will not be deformed and damaged or burst, and will not be deformed and rub against the outer stator, affecting the service life of the motor.

[0033] Further, one of the embodiments, as shown in Figure 3 The integral magnet ring 320 is high in cost and is suitable for high-precision, low-torque ripple demand, high-speed or high-reliability scenarios.

[0034] Further, another embodiment, as shown in Figure 2 The split magnet ring 320 is low in cost and high in maintenance convenience, and can optimize the magnetic field by changing the magnetic block arrangement according to demand. The split magnet ring 320 is a plurality of magnets assembled into a magnet ring 320 by gluing.

[0035] In another embodiment of the present application, according to Figure 5 and 6 The expansion compensation structure is a plurality of expansion groove groups 311, which are uniformly arranged circumferentially around the magnetic conducting ring 310.

[0036] Specifically, the expansion groove group 311 makes the magnetic conducting ring 310 no longer rigid as a whole, but forms a flexible structure similar to a "spring". When the rotating shaft 120 expands, the magnetic conducting ring 310 can compensate for the increase in the diameter of the rotating shaft 120 by slightly closing the expansion groove group 311, avoiding hard extrusion.

[0037] Further, in another embodiment, according to Figure 4 The expansion compensation structure is a plurality of expansion grooves 312, which are uniformly arranged circumferentially around the magnetic conducting ring 310. Each expansion groove 312 is arranged perpendicular to the circumference. The two ends of the expansion groove 312 are not communicated with the end of the magnetic conducting ring 310, and the expansion groove 312 is a through groove.

[0038] Further, the expansion compensation structure is a plurality of expansion groove groups 311, which are uniformly arranged circumferentially around the magnetic conducting ring 310. The expansion groove group 311 includes but is not limited to the following two embodiments.

[0039] One of them, as shown in Figure 5 Each expansion groove group 311 includes a first groove 3111 and a second groove 3112 arranged perpendicular to the circumference. The first groove 3111 and the second groove 3112 are arranged in cross, one end of the first groove 3111 and the second groove 3112 is communicated to the end of the magnetic conducting ring 310, and the other end is not communicated to the other end of the magnetic conducting ring 310. The first groove 3111 and the second groove 3112 are through grooves.

[0040] Another one, as shown in Figure 6As shown, each expansion groove group 311 includes a first groove 3111 and a second groove 3112 arranged perpendicularly to the circumference; the first groove 3111 and the second groove 3112 are arranged in a straight line, one end of the first groove 3111 and the second groove 3112 respectively communicates with the end of the magnetic conducting ring 310, and the other end of the first groove 3111 and the second groove 3112 does not communicate with each other, and the first groove 3111 and the second groove 3112 are through grooves. Each expansion groove group 311 further includes a third groove 3113 arranged perpendicularly to the circumference; both ends of the third groove 3113 do not communicate with the end of the magnetic conducting ring 310, and the third groove 3113 is a through groove. Specifically, as a preferred embodiment, by arranging the parallel first groove 3111 and the second groove 3112, the left and right sides are more evenly stressed, and the third groove 3113 is arranged in the middle, which can make the anti-thermal expansion ability stronger, the more the groove bodies are and the more uniform the distribution is, the greater the elastic force of the shaft 120 diameter expansion is, and the magnetic conducting ring 310 is less likely to be damaged and burst, and is less likely to be deformed, so that the external magnet ring 320 is also less likely to be deformed, and the rotor assembly 300 is less likely to rub against the external stator assembly 200, thereby improving the service life of the motor.

[0041] It can be understood that the expansion groove groups 311 of the above two embodiments can realize the effect of offsetting the thermal expansion of the shaft 120, and other embodiments including but not limited to three grooves, four grooves, etc. are within the protection scope of the expansion groove group 311.

[0042] Further, the first groove 3111 and the second groove 3112 are symmetrically arranged or cross-arranged, and cannot be designed on one side or on the middle and one side, otherwise the left and right sides will be unevenly stressed when the shaft 120 is thermally expanded, causing cracking or deformation.

[0043] It can be understood that the elastic magnetic conducting ring 310 can reduce the cumulative error of the motor, and the elastic part can be tightly fitted and installed without reserving installation space.

[0044] In another embodiment of the present application, according to Figures 1-3 As shown, the shaft sleeve 330 is made of a lightweight material with a low expansion coefficient. The material of the shaft sleeve 330 includes one of plastic, carbon fiber, ceramic, aluminum alloy, and titanium alloy. Specifically, using a lightweight material can reduce the inertia of the motor rotor, thereby realizing high corresponding speed of the motor.

[0045] In another embodiment of the present application, according to Figures 1-3 As shown, the shell 100 is provided with a front cover 130 and a rear cover 140, and the front cover 130 and the rear cover 140 are both provided with shaft holes 150, and the two ends of the shaft 120 respectively pass through the two shaft holes 150; the front cover 130 and the rear cover 140 are further provided with heat dissipation holes 133, and the heat dissipation holes 133 are used for heat dissipation of the motor. Specifically, the heat dissipation holes 133 are multiple, which can improve the heat exchange efficiency with the outside.

[0046] In another embodiment of the present application, according to Figure 2 As shown in the drawings, the inner side middle part of the front cover 130 and the rear cover 140 is convex with a hollow inner edge 131, and the inner wall of the inner edge 131 and the rotating shaft 120 form a placement position 132, and the placement position 132 is provided with a bearing 160. Specifically, the inner edge 131 is specially reserved for the bearing 160 to form a placement position 132, so that the bearing 160 can be placed in the placement position 132.

[0047] In another embodiment of the present application, according to Figure 1 and 2 As shown in the drawings, one end of the rotating shaft 120 is provided with a first slot 121, one end provided with the first slot 121 is provided with a gear 170, the inner wall of the gear 170 is provided with a second slot 171, one end of a positioning member 180 is inserted into the first slot 121, and the other end is inserted into the second slot 171. Specifically, by setting the positioning member 180, the rotating force of the rotating shaft 120 can be directly transmitted to the gear 170, preventing relative rotation (slippage) between the two. At the same time, the positioning member 180 plays a role in centering during installation, ensuring that the angle of the gear 170 and the rotating shaft 120 is aligned.

[0048] In another embodiment of the present application, according to Figure 2 As shown in the drawings, the stator assembly 200 is also provided with a circuit board 210, and the circuit board 210 is used to realize closed-loop control of position, speed and torque.

[0049] The above is a further detailed description of the present application in combination with a specific preferred embodiment, and cannot be considered as limiting the specific implementation of the present application to these descriptions. For ordinary skilled persons in the technical field to which the present application belongs, the architecture form can be flexible and variable without departing from the concept of the present application, and a series of products can be derived. Only a few simple deductions or substitutions should be considered as belonging to the patent protection range determined by the submitted claims of the present application.

Claims

1. An integrated thermal expansion resistant rotor structure, characterized by, The magnet ring is integrally formed, and the expansion offset structure is arranged on the magnetic conductive ring.

2. The one-piece, thermally stable rotor structure of claim 1, wherein, The expansion offset structure is a plurality of expansion grooves which are evenly arranged around the magnetic conductive ring in the circumferential direction.

3. The one-piece, thermally stable rotor structure of claim 1, wherein, The expansion offset structure is a plurality of expansion groove groups which are evenly arranged around the magnetic conductive ring in the circumferential direction.

4. The one-piece, thermally stable rotor structure of claim 3, wherein, Each expansion groove group comprises a first groove and a second groove which are arranged perpendicularly to the circumferential direction; the first groove and the second groove are arranged in cross, one end of the first groove and the second groove are communicated to the end of the magnetic conductive ring, and the other end is not communicated to the other end of the magnetic conductive ring; the first groove and the second groove are through grooves.

5. The one-piece, thermally stable rotor structure of claim 3, wherein, Each expansion groove group comprises a first groove and a second groove which are arranged perpendicularly to the circumferential direction; the first groove and the second groove are arranged on the same straight line, one end of the first groove and the second groove are respectively communicated to the end of the magnetic conductive ring, and the other end is not communicated to each other, and the first groove and the second groove are through grooves.

6. The one-piece, thermally stable rotor structure of claim 5, wherein, Each expansion groove group further comprises a third groove which is arranged perpendicularly to the circumferential direction; both ends of the third groove are not communicated to the end of the magnetic conductive ring, and the third groove is a through groove.

7. The monolithic, thermally stable rotor structure of claim 1, wherein, The shaft sleeve is made of light-weight and low-expansion-coefficient material.

8. The one-piece, thermally stable rotor structure of claim 7, wherein, The material of the shaft sleeve comprises one of plastic, carbon fiber, ceramic, aluminum alloy and titanium alloy.

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