Assembly tool of motor rotor

Abstract

The invention provides a motor rotor assembly tool which comprises a guide rod assembly, the guide rod assembly comprises a core rod and a sleeve, the sleeve is arranged on the periphery of the core rod in a sleeving mode, the hardness of the core rod is larger than that of the sleeve, the guide rod assembly is of a cylinder structure, one axial end of the guide rod assembly can be connected with a rotor, and the other axial end of the guide rod assembly can be connected with the rotor. The other axial end of the guide rod assembly is inserted into a shaft hole in the motor shell so that the rotor can be guided and pulled into the shaft hole, and the shaft hole comprises a shaft hole of a stator and a shaft hole of a bearing. According to the invention, it can be ensured that the whole assembly is not greatly bent due to forced reasons and the like, and the guiding effect on the rotor is improved, so that the assembly centering effect on the motor rotor is improved, and the situation that the rotor deviates from the center position and scratches a bearing is prevented; the problems that the rotor cannot be centered, so that the rotor deviates from the central position, and the rotor is scratched with a bearing are solved.

Description

Technical Field

[0001] The invention relates to the technical field of motors, and in particular to an assembly tool for a motor rotor. Background Art

[0002] Because the rotor of a permanent magnet motor has magnetized permanent magnets, when the rotor is assembled, the stator core and other magnetic conductive parts on the housing will generate a strong magnetic attraction to the rotor, causing the rotor to deviate from the center position and fail to smoothly enter the shaft and align. In addition, for permanent magnet motors using magnetic bearings, this deviation will also cause friction and scratches between the rotor and the magnetic bearing, causing damage to the rotor and bearings. Therefore, when assembling the rotor of a magnetic permanent magnet motor, assembly tools and other auxiliary structures must be used to prevent the rotor from deviating from the center position and scratching the bearings.

[0003] In the existing patents, the assembly of the axial magnetic bearing may result in scratches or even inability to move. On the one hand, the assembly will be difficult, and on the other hand, it will not avoid damage to the rotor and the magnetic bearing. Even the support frame cannot withstand the center of gravity offset caused by the extra-long metal rod, the connection is prone to breakage, and the parts themselves will be difficult to align due to falling due to gravity.

[0004] Since the permanent magnet motor in the prior art has the problem that the rotor cannot be effectively aligned during assembly, resulting in technical problems such as the rotor deviating from the center position and scratching the bearing, the present invention studies and designs an assembly tool for the motor rotor. Summary of the invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the permanent magnet motor in the prior art cannot effectively complete the alignment during rotor assembly, resulting in the rotor deviating from the center position and scratching the bearing, thereby providing an assembly tool for the motor rotor.

[0006] In order to solve the above problems, the present invention provides an assembly tool for a motor rotor, which comprises:

[0007] A guide rod assembly, the guide rod assembly includes a core rod and a sleeve, the sleeve is sleeved on the outer circumference of the core rod, the hardness of the core rod is greater than the hardness of the sleeve, the guide rod assembly is a rotating body structure, one axial end of the guide rod assembly can be connected to the rotor, and the other axial end of the guide rod assembly is inserted into the axial hole inside the motor housing to guide and pull the rotor into the axial hole, and the axial hole includes the axial hole of the stator and the axial hole of the bearing.

[0008] In some embodiments,

[0009] The core rod is made of hard metal material, and the sleeve is made of deformable material, which is at least one of nylon, plastic and rubber.

[0010] In some embodiments,

[0011] The axial end of the guide rod assembly connected to the rotor is the connecting end, the axial end of the guide rod assembly first inserted into the motor housing is the insertion end, and along the axial direction of the guide rod assembly, the outer diameter of the sleeve relatively close to the insertion end is smaller than the outer diameter of the sleeve relatively close to the connecting end.

[0012] In some embodiments,

[0013] Along the axial direction of the guide rod assembly, there are at least two sleeves, and at least two sleeves are sleeved on the outer circumference of the core rod; and / or, along the axial direction of the guide rod assembly, and in the direction from the insertion end to the connection end, the outer diameter of the sleeve gradually increases.

[0014] In some embodiments,

[0015] Along the axial direction of the guide rod assembly, the sleeve includes a first sleeve, a second sleeve and a third sleeve, the first sleeve is the sleeve first inserted into the motor housing, the third sleeve is the sleeve last inserted into the motor housing, the second sleeve is connected between the first sleeve and the third sleeve, and the first sleeve, the second sleeve and the third sleeve are all cylinders, and the outer diameter of the first sleeve is smaller than the outer diameter of the second sleeve, and the outer diameter of the second sleeve is smaller than the outer diameter of the third sleeve.

[0016] In some embodiments,

[0017] The first sleeve includes a first cylindrical body and an annular cylinder, the annular cylinder is connected to one axial end of the first cylindrical body, the inner diameter of the annular cylinder is smaller than the inner diameter of the first cylindrical body, so that the axial end surface of the annular cylinder facing the first cylindrical body is connected to the inner wall of the first cylindrical body, and the two form a step surface to limit the axial end of the core rod, and the annular cylinder forms the insertion end of the guide rod assembly.

[0018] In some embodiments,

[0019] A fastener is also included. A mounting hole is formed on the inner circumference of the annular cylinder. The fastener passes through the mounting hole to be fixedly connected with one axial end of the core rod.

[0020] In some embodiments,

[0021] The second sleeve includes a second cylindrical body, and the third sleeve includes a third cylindrical body. One axial end of the second cylindrical body is connected to the first cylindrical body, and the other axial end of the second cylindrical body is connected to the third cylindrical body.

[0022] In some embodiments,

[0023] The core rod includes a rotating body structure and a protrusion, the rotating body structure is inserted in the sleeve, the protrusion is connected to an axial end of the rotating body structure facing the rotor and protrudes axially, the outer diameter of the protrusion is smaller than the outer diameter of the rotating body structure at the connection therewith, the protrusion is located outside the sleeve and can be plugged into and matched with the rotor to form the connecting end of the guide rod assembly.

[0024] In some embodiments,

[0025] A guide seat, the stator and the bearing are arranged in the motor housing, and the bearing includes a radial bearing and an axial bearing. Along the axial direction, the guide seat, the radial bearing, the stator and the axial bearing are arranged in sequence, and the guide rod assembly is connected to the rotor through its connecting end, and is inserted and assembled from the axial bearing toward the stator, the radial bearing and the guide seat in sequence through the insertion end of the guide rod assembly.

[0026] In some embodiments,

[0027] An auxiliary centering ring is also provided on the inner periphery of the axial bearing to allow the rotor to be inserted into the auxiliary centering ring. An axial end of the rotor away from the guide rod assembly is also connected to a hanging ring.

[0028] The motor rotor assembly tool provided by the present invention has the following beneficial effects:

[0029] 1. The present invention provides a guide rod assembly including a core rod and a sleeve, and the sleeve is sleeved on the outer circumference of the core rod. It can be connected to the rotor through one axial end of the guide rod assembly, and the other axial end is inserted into the axial hole of the motor housing to complete the guiding and traction of the motor rotor. The hardness of the sleeve is less than that of the core rod. It can be inserted through the sleeve and the inner holes of structures such as the stator and bearing to provide guidance for the rotor. The hardness of the core rod is greater than that of the sleeve and is located on the outer circumference of the sleeve. It can ensure that the entire assembly will not bend significantly due to being forced or the like, thereby improving the guiding effect on the rotor, thereby improving the assembly centering effect on the motor rotor, preventing the rotor from deviating from the center position and scratching the bearing, solving the problem of deviation from the center position due to failure to complete rotor centering and solving the problem of scratching the bearing.

[0030] 2. The present invention also makes the sleeve of a material with low wall core rod hardness (preferably deformable materials such as nylon, plastic and rubber), which can ensure effective protection of stators, bearings and other components during the process of inserting them into the inner holes of structures such as bearings and stators; the present invention also arranges the sleeve so that the outer diameter of the sleeve relatively close to the insertion end is smaller than the outer diameter of the sleeve relatively close to the connection end (including multi-stage stepped sleeves and gradually changing gradient sleeves), so that the small diameter end is inserted first and the large end is inserted later, thereby improving the guiding effect and centering effect; the present invention further reduces the processing requirements of most parts through the multi-stage sleeve structure, and can also replace only the corresponding parts instead of the entire parts when some parts are damaged, thereby reducing the processing cost.

[0031] 3. The present invention also assists in rotor alignment by adding a protective aluminum ring on some magnetic bearing parts on the other side without a guide structure and installing it on the housing first, thereby reducing the complicated and dangerous rotor-magnetic bearing pre-installation work steps and improving the rotor alignment assembly effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural diagram of the assembly process of the motor rotor of the present invention;

[0033] Figure 2 yes Figure 1 A partial enlarged view of part I;

[0034] Figure 3 Figure 1 A partial enlarged view of part II;

[0035] Figure 4 A schematic diagram of the assembly process of the axial bearing and the aluminum ring of the present invention;

[0036] Figure 5 is an exploded structural diagram of the guide rod assembly of the present invention;

[0037] Figure 6 is a longitudinal cross-sectional view of the guide rod assembly of the present invention after being assembled;

[0038] Figure 7 It is a schematic diagram of the motor rotor of the present invention after being assembled.

[0039] The reference numerals are:

[0040] 1. Motor housing; 2. Stator; 3. Radial bearing; 4. Guide seat; 5. Axial bearing; 52. Auxiliary centering ring; 6. Rotor; 7. Guide rod assembly; 71. Core rod; 711. Rotating body structure; 712. Protrusion; 70. Sleeve; 72. Third sleeve; 721. Third cylinder; 73. Second sleeve; 731. Second cylinder; 74. First sleeve; 741. First cylinder; 742. Circular cylinder; 743. Mounting hole; 75. Fastener; 8. Lifting ring. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0043] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0044] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0045] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0046] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0047] like Figure 1-7 As shown, the present invention provides an assembly tool for a motor rotor (preferably a rotor of a magnetic levitation permanent magnet motor), which includes:

[0048] The guide rod assembly 7 includes a core rod 71 and a sleeve 70, wherein the sleeve 70 is sleeved on the outer circumference of the core rod 71, the hardness of the core rod 71 is greater than the hardness of the sleeve 70, and the guide rod assembly 7 is a rotating body structure, one axial end of the guide rod assembly 7 can be connected to the rotor 6, and the other axial end of the guide rod assembly 7 is inserted into the axial hole inside the motor housing 1 to guide and pull the rotor 6 into the axial hole, and the axial hole includes the axial hole of the stator and the axial hole of the bearing.

[0049] The present invention provides a guide rod assembly including a core rod and a sleeve, and the sleeve is sleeved on the outer circumference of the core rod. It can be connected to the rotor through one axial end of the guide rod assembly, and the other axial end is inserted into the axial hole of the motor housing to complete the guiding and traction of the motor rotor. The hardness of the sleeve is less than that of the core rod. It can be inserted through the sleeve and the inner holes of structures such as the stator and bearing to provide guidance for the rotor. The hardness of the core rod is greater than that of the sleeve and is located on the outer circumference of the sleeve. It can ensure that the entire assembly will not bend significantly due to being forced or the like, thereby improving the guiding effect on the rotor, thereby improving the assembly centering effect on the motor rotor, preventing the rotor from deviating from the center position and scratching the bearing, solving the problem of deviation from the center position due to failure to complete rotor centering and solving the problem of scratching the bearing.

[0050] In some embodiments,

[0051] The core rod 71 is made of hard metal material, and the sleeve 70 is made of a deformable material, which is at least one of nylon, plastic and rubber.

[0052] This is the preferred material for the core rod and sleeve of the present invention. The core rod is made of hard metal material, which can effectively guide and prevent bending and deformation, while the sleeve is made of deformable materials such as nylon, plastic and rubber, which can guide the rotor while also providing good protection for structures such as bearings and stators to prevent them from being scratched and damaged.

[0053] The present invention provides a magnetic levitation permanent magnet motor assembly tool and auxiliary structure which are more convenient to assemble. No complicated preparation work is required before inserting the motor into the shaft. During the insertion, the rotor can be ensured not to deviate from the center position and can be smoothly inserted into the shaft. In addition, the guiding components take into account both the protection of the magnetic bearing and the overall anti-deformation and bending performance.

[0054] In some embodiments,

[0055] The axial end of the guide rod assembly 7 connected to the rotor 6 is a connecting end, the axial end of the guide rod assembly 7 first inserted into the motor housing 1 is an insertion end, and along the axial direction of the guide rod assembly 7, the outer diameter of the sleeve 70 relatively close to the insertion end is smaller than the outer diameter of the sleeve 70 relatively close to the connecting end.

[0056] This is the preferred structural form of the guide rod assembly of the present invention, that is, it includes a connecting end connected to the rotor and an insertion end first inserted into the shell. The present invention further arranges the sleeve so that the outer diameter of the sleeve relatively close to the insertion end is smaller than the outer diameter of the sleeve relatively close to the connecting end, so that the end with a small outer diameter is inserted first and the end with a large outer diameter is inserted later, thereby further improving the guiding effect and centering effect on the rotor.

[0057] In some embodiments,

[0058] Along the axial direction of the guide rod assembly 7, there are at least two sleeves 70, and at least two sleeves are sleeved on the outer periphery of the core rod 71; and / or, along the axial direction of the guide rod assembly 7, and in the direction from the insertion end to the connection end, the outer diameter of the sleeve 70 gradually increases.

[0059] The sleeves of the present invention are preferably multiple, which can not only guide the assembly and centering of the rotor but also be easy to process, repair and replace, reducing the processing requirements of most parts. When some parts are damaged, only the corresponding parts can be replaced instead of the entire part, reducing the processing cost. The outer diameter of the sleeve gradually increases from the insertion end to the connecting end of the present invention, and a gradual sleeve structure can be formed, which can further improve the guiding and centering effects on the rotor.

[0060] In some embodiments,

[0061] Along the axial direction of the guide rod assembly 7, the sleeve 70 includes a first sleeve 74, a second sleeve 73 and a third sleeve 72, the first sleeve 74 is the first sleeve inserted into the motor housing 1, the third sleeve 72 is the last sleeve inserted into the motor housing 1, the second sleeve 73 is connected between the first sleeve 74 and the third sleeve 72, and the first sleeve 74, the second sleeve 73 and the third sleeve 72 are all cylinders, and the outer diameter of the first sleeve 74 is smaller than the outer diameter of the second sleeve 73, and the outer diameter of the second sleeve 73 is smaller than the outer diameter of the third sleeve 72.

[0062] The present invention further preferably comprises a first, a second and a third sleeve which are connected in sequence in the axial direction, so that the first sleeve is inserted first (forming an insertion end), the third sleeve is located at the tail end, and the outer diameter of the first sleeve is less than the outer diameter of the second sleeve, which is smaller than the outer diameter of the third sleeve, thereby forming a multi-stage stepped sleeve, with the insertion end being a small end and the rear end being a successively larger sleeve end, which can further improve the guiding effect and centering effect on the rotor.

[0063] The guide component of the present invention preferably adopts the above-mentioned hard metal core rod + multi-stage stepped nylon sleeve structure. On the one hand, it can ensure that the entire component will not bend significantly due to force or the like, and can also protect devices such as magnetic bearings. On the other hand, the multi-stage stepped nylon sleeve structure can reduce the processing requirements of most parts, and when some parts are damaged, only the corresponding parts need to be replaced instead of the entire part, thereby reducing processing costs.

[0064] like Figure 5-6The guide rod assembly 7 is composed of a core rod 71, an upper sleeve (third sleeve 72), a middle sleeve (second sleeve 73), a lower sleeve (first sleeve 74) and a screw (fastener 75); the core rod 71 is made of hard metal (or alloy) material, one side of which has an external thread that cooperates with the center hole of the rotor 6, and the other side has an internal thread that cooperates with the fastener 75. The outer diameter of the remaining outer surface is consistent with that of the upper sleeve, the middle sleeve and the lower sleeve, and is matched with the three sleeves with a small gap; the three sleeves are made of nylon (or plastic materials such as polytetrafluoroethylene), and as Figure 5-6 As shown in , the outer diameters of the three are not much different, and the size relationship is upper sleeve>middle sleeve>lower sleeve, which are arranged in steps; the outer diameter of the upper sleeve should be consistent with the inner diameter of the radial bearing 3 and the guide seat 4, and fit with the two with a small clearance. The outer diameter processing accuracy requirement is relatively high. Because there is no matching requirement for the other two sleeves, their processing accuracy requirements are lower. In actual processing, the sleeve divided into three sections is also easier to process than a whole long nylon rod, so the processing cost is greatly reduced compared to the whole nylon rod.

[0065] In some embodiments,

[0066] The first sleeve 74 includes a first cylindrical body 741 and an annular cylinder 742, and the annular cylinder 742 is connected to one axial end of the first cylindrical body 741. The inner diameter of the annular cylinder 742 is smaller than the inner diameter of the first cylindrical body 741, so that the axial end face of the annular cylinder 742 facing the first cylindrical body 741 is connected to the inner wall of the first cylindrical body 741, and the two form a step surface to limit the axial end of the core rod 71. The annular cylinder 742 forms the insertion end of the guide rod assembly 7.

[0067] This is a further preferred structural form of the first sleeve of the present invention, that is, a structure including a first cylindrical body and an annular column, which are connected to form a step surface for limiting the axial end of the core rod, and the annular column wraps the core rod inside, so that the relatively flexible annular column is the insertion end, which further improves the protection of bearings, stators and other components to prevent scratches and damage.

[0068] In some embodiments,

[0069] A fastener 75 is also included. A mounting hole 743 is formed on the inner circumference of the annular cylinder 742 . The fastener 75 passes through the mounting hole 743 to be fixedly connected to one axial end of the core rod 71 .

[0070] The present invention can also fasten the core rod and the circular cylinder together through the fasteners and the mounting holes on the circular cylinder, so that the core rod and the sleeve form an integrated structure, which is convenient for guiding and inserting the rotor from top to bottom.

[0071] In some embodiments,

[0072] The second sleeve 73 includes a second cylindrical body 731 , and the third sleeve 72 includes a third cylindrical body 721 . One axial end of the second cylindrical body 731 is connected to the first cylindrical body 741 , and the other axial end of the second cylindrical body 731 is connected to the third cylindrical body 721 .

[0073] The second sleeve and the third sleeve of the present invention are preferably cylindrical structures, which can form a sleeve structure in which the first cylinder, the second cylinder and the third cylinder are connected in sequence in the axial direction; the three can be fixedly connected or simply fitted together. The present invention preferably arranges the first sleeve, the second sleeve and the third sleeve in sequence from bottom to top, and the second and third sleeves are fitted to the upper end of the first sleeve by gravity.

[0074] In some embodiments,

[0075] The core rod 71 includes a rotating body structure 711 and a protrusion 712. The rotating body structure 711 is inserted in the sleeve 70. The protrusion 712 is connected to the axial end of the rotating body structure 711 facing the rotor 6 and protrudes axially. The outer diameter of the protrusion 712 is smaller than the outer diameter of the rotating body structure 711 connected thereto. The protrusion 712 is located outside the sleeve 70 and can be plugged into and matched with the rotor 6 to form the connecting end of the guide rod assembly 7.

[0076] The core rod of the present invention preferably includes a rotating body structure and a protrusion. The rotating body structure can be plugged into the sleeve, and the protrusion can be plugged into the rotor to form a connecting end. The outer diameter of the rotor is preferably equal to the outer diameter of the sleeve (preferably the third sleeve). Therefore, the outer diameter of the protrusion is smaller than the outer diameter of the rotating body structure, which can well achieve this purpose.

[0077] In some embodiments,

[0078] A guide seat 4, the stator 2 and the bearing are arranged in the motor housing 1, and the bearing includes a radial bearing 3 and an axial bearing 5. Along the axial direction, the guide seat 4, the radial bearing 3, the stator 2 and the axial bearing 5 are arranged in sequence, and the guide rod assembly 7 is connected to the rotor 6 through its connecting end, and is inserted and assembled from the axial bearing 5 toward the stator 2, the radial bearing 3 and the guide seat 4 in sequence through the insertion end of the guide rod assembly 7.

[0079] This is the internal structural form of the motor of the present invention, and the guide rod assembly is inserted and assembled in the direction of the axial bearing, the stator, the radial bearing and the guide seat in sequence, so that the rotor is assembled into the above structure. Finally, the guide rod assembly is inserted out from under the guide seat and can be removed from the rotor to complete the centering guidance and assembly effect of the rotor.

[0080] by Figure 1 Taking the scenario shown in as an example, the entire motor assembly process is explained: before assembling the rotor, the stator 2, the radial bearing 3 and the axial bearing 5 should all be installed in the motor housing 1 in advance, and the guide seat 4 is one of the auxiliary tooling. If the end of the rotor does not exceed the end face of the radial bearing 3 after assembly, the guide rod assembly 7 only needs to cooperate with the inner cylindrical surface of the radial bearing 3 to complete the guiding function, and the guide seat 4 is not required; but if the rotor end face eventually exceeds the end face of the radial bearing 3, it is necessary to install the guide seat 4 on the radial bearing 3, and the inner diameter of the guide seat 4 is consistent with the inner diameter of the radial bearing 3. After the end face exceeds the end face of the radial bearing 3 during rotor assembly, the guide seat 4 continues to complete the final stage of the guiding function with the guide rod assembly 7. The present invention preferably includes a guide seat 4.

[0081] See also Figure 1 After the stator 2, radial bearing 3, guide seat 4, axial bearing 5 and aluminum ring are assembled, the motor housing 1 is turned over, the side where the axial bearing 5 is located faces upward, and the rotor 6 is assembled with the guide rod assembly 7 and the lifting ring 8 and then lifted, so that one side of the guide rod assembly 7 is vertically downward, roughly aligned with the center position and gradually inserted into the shaft; before the rotor 6 contacts the matching surface of the protective aluminum ring, the lower sleeve of the guide rod assembly 7 should be close to the inner circle section of the radial bearing 3, and the outer diameter of the lower sleeve is close to the inner diameter of the radial bearing, but a large gap is still left, so when the lower sleeve enters the inner circle of the radial bearing 3, it will not be difficult to enter due to a slight deviation in the rotor center configuration. After entering, the guide rod assembly 7 can roughly guide the rotor 6; after the protective aluminum ring and the rotor 6 are matched, the entire rotor will basically not deviate too much from the center position, and the gradually increasing stepped outer diameters of the three sleeves in the guide rod assembly 7 will gradually achieve complete centering during the process of entering the shaft until the end face of the thrust plate of the rotor 6 contacts the upper end face of the axial bearing 5, such as Figure 7 As shown, the rotor has been assembled, and the lifting ring 8, the guide rod assembly 7, and the guide seat 4 can be removed in turn to complete the assembly of the remaining parts of the motor; protected by three nylon sleeves, even if the rotor contacts or even collides with the radial bearing 3 during assembly, no damage will be caused to the inside of the radial bearing assembly, and the sleeve that cannot be used after damage can be replaced, which can better protect bearings and other parts compared to the whole metal rod as a guide; and the hard metal core rod ensures that when the rotor 6 is offset by magnetic attraction, the pressure it exerts on the guide rod assembly 7 will not cause the entire assembly to deform or bend, and it is more durable than the whole nylon rod / plastic rod / rubber rod.

[0082] In some embodiments,

[0083] An auxiliary centering ring 52 (preferably an aluminum ring) is also provided on the inner periphery of the axial bearing 5 to allow the rotor 6 to be inserted into the auxiliary centering ring 52 . A lifting ring 8 is also connected to the axial end of the rotor 6 away from the guide rod assembly 7 .

[0084] The present invention also assists in rotor centering by adding a protective aluminum ring to some magnetic bearing parts on the other side without a guide structure and installing it on the housing first, thereby reducing complicated and dangerous rotor-magnetic bearing pre-installation steps and improving the rotor centering assembly effect.

[0085] like Figure 4 The axial bearing 5 and the aluminum ring (auxiliary centering ring 52) are preferably interference fit, and the aluminum ring is assembled to a specific position of the axial bearing 5 by heat installation, and its inner diameter should be smaller than the inner diameter of the axial bearing 5, and slightly larger than the outer diameters on both sides of the thrust plate of the rotor 6; the inner surface of the aluminum ring can be simply polished, or a graphite coating can be added, lubricating oil can be applied, etc. to reduce the friction between the rotor and the aluminum ring during assembly.

[0086] The scheme of the present invention adopts a combination of a guide rod assembly of a hard metal core rod + a multi-step nylon sleeve and a protective aluminum ring, which ensures that the rotor does not deviate from the center position when entering the shaft, and can more smoothly complete the rotor assembly. At the same time, the structure of the guide rod combining two different material parts can not only ensure that it will not bend during repeated use, but also will not damage components such as magnetic bearings during insertion into the shaft. The protective aluminum ring will not cause hard friction with the rotor due to magnetic attraction generated by magnetic conduction, thereby damaging the rotor while assisting in alignment. The guide rod assembly and the protective aluminum ring are easy to process and have low processing costs.

[0087] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. 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 present invention. The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention. These improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. An assembly tool for a motor rotor, characterized in that: include: A guide rod assembly (7), the guide rod assembly (7) comprising a core rod (71) and a sleeve (70), the sleeve (70) being sleeved on the outer circumference of the core rod (71), the hardness of the core rod (71) being greater than the hardness of the sleeve (70), the guide rod assembly (7) being a rotating body structure, one axial end of the guide rod assembly (7) being connectable to a rotor (6), the other axial end of the guide rod assembly (7) being inserted into an axial hole inside a motor housing (1) so as to guide and pull the rotor (6) into the axial hole, the axial hole comprising an axial hole of a stator and an axial hole of a bearing.

2. The motor rotor assembly tool according to claim 1, characterized in that: The core rod (71) is made of a hard metal material, and the sleeve (70) is made of a deformable material, which is at least one of nylon, plastic and rubber.

3. The motor rotor assembly tool according to claim 1, characterized in that: The axial end of the guide rod assembly (7) connected to the rotor (6) is the connection end, the axial end of the guide rod assembly (7) first inserted into the motor housing (1) is the insertion end, and along the axial direction of the guide rod assembly (7), the outer diameter of the sleeve (70) relatively close to the insertion end is smaller than the outer diameter of the sleeve (70) relatively close to the connection end.

4. The motor rotor assembly tool according to claim 3, characterized in that: Along the axial direction of the guide rod assembly (7), there are at least two sleeves (70), and at least two sleeves are sleeved on the outer circumference of the core rod (71); and / or, along the axial direction of the guide rod assembly (7), the outer diameter of the sleeve (70) gradually increases from the insertion end to the connection end.

5. The motor rotor assembly tool according to claim 4, characterized in that: Along the axial direction of the guide rod assembly (7), the sleeve (70) includes a first sleeve (74), a second sleeve (73) and a third sleeve (72), the first sleeve (74) being the first sleeve inserted into the motor housing (1), the third sleeve (72) being the last sleeve inserted into the motor housing (1), the second sleeve (73) being connected between the first sleeve (74) and the third sleeve (72), and the first sleeve (74), the second sleeve (73) and the third sleeve (72) are all cylinders, and the outer diameter of the first sleeve (74) is smaller than the outer diameter of the second sleeve (73), and the outer diameter of the second sleeve (73) is smaller than the outer diameter of the third sleeve (72).

6. The motor rotor assembly tool according to claim 5, characterized in that: The first sleeve (74) comprises a first cylindrical body (741) and an annular cylinder (742), wherein the annular cylinder (742) is connected to one axial end of the first cylindrical body (741), and the inner diameter of the annular cylinder (742) is smaller than the inner diameter of the first cylindrical body (741), so that the axial end surface of the annular cylinder (742) facing the first cylindrical body (741) is connected to the inner wall of the first cylindrical body (741), and the two form a step surface to limit the axial end of the core rod (71), and the annular cylinder (742) forms the insertion end of the guide rod assembly (7).

7. The motor rotor assembly tool according to claim 6, characterized in that: It also includes a fastener (75). The inner circumference of the annular cylinder (742) forms a mounting hole (743). The fastener (75) passes through the mounting hole (743) to be fixedly connected to one axial end of the core rod (71).

8. The motor rotor assembly tool according to claim 6, characterized in that: The second sleeve (73) includes a second cylindrical body (731), and the third sleeve (72) includes a third cylindrical body (721). One axial end of the second cylindrical body (731) is connected to the first cylindrical body (741), and the other axial end of the second cylindrical body (731) is connected to the third cylindrical body (721).

9. The motor rotor assembly tool according to any one of claims 3 to 8, characterized in that: The core rod (71) includes a rotating body structure (711) and a protrusion (712), wherein the rotating body structure (711) is inserted into the sleeve (70), and the protrusion (712) is connected to an axial end of the rotating body structure (711) facing the rotor (6) and protrudes along the axial direction, and the outer diameter of the protrusion (712) is smaller than the outer diameter of the rotating body structure (711) at the connection therewith, and the protrusion (712) is located outside the sleeve (70) and can be plugged into and matched with the rotor (6) to form the connecting end of the guide rod assembly (7).

10. The motor rotor assembly tool according to any one of claims 3 to 9, characterized in that: A guide seat (4), the stator (2) and the bearing are arranged in the motor housing (1); the bearing comprises a radial bearing (3) and an axial bearing (5); along the axial direction, the guide seat (4), the radial bearing (3), the stator (2) and the axial bearing (5) are arranged in sequence, and the guide rod assembly (7) is connected to the rotor (6) through its connecting end, and is inserted and assembled from the axial bearing (5) toward the stator (2), the radial bearing (3) and the guide seat (4) in sequence through the insertion end of the guide rod assembly (7).

11. The motor rotor assembly tool according to claim 10, characterized in that: An auxiliary centering ring (52) is also provided on the inner periphery of the axial bearing (5) to allow the rotor (6) to be inserted into the auxiliary centering ring (52), and a lifting ring (8) is also connected to the axial end of the rotor (6) away from the guide rod assembly (7).

Images