Rotor installation tool and assembly method

Abstract

The present invention discloses a rotor installation tool, comprising a detachable assembly base, a rotor yoke and a detection ring for detecting whether a permanent magnet is assembled in place. The rotor yoke is provided with a groove structure adapted to the permanent magnet, and the detachable assembly base is provided with a rotor bracket for supporting the rotor yoke and the permanent magnet. The holes in the center of the rotor bracket are respectively matched and positioned with the detachable assembly base through keys. Also disclosed is an assembly method for a rotor with permanent magnets in an array structure with different magnetizing directions. The present invention avoids the phenomenon of flipping and collision caused by the interaction force becoming larger due to the close distance between the permanent magnets during assembly, reduces the difficulty of installation, and ensures the reliability and safety of installation.

Description

Technical Field

[0001] The present invention belongs to the field of rotor assembly, and in particular relates to an installation tool for a rotor with an array permanent magnet structure, and an assembly method thereof. Background Art

[0002] The rotor of the array permanent magnet structure is assembled by permanent magnets with different magnetizing directions arranged according to a certain regular pattern. Currently, the permanent magnets of the array structure use four or eight permanent magnets with different magnetizing directions arranged alternately in a ring to form a Halbach array.

[0003] Because permanent magnets are hard and brittle, their surface coating cannot be damaged. Furthermore, permanent magnets must be magnetized before assembly. There is mutual attraction and repulsion between permanent magnets. As the distance between adjacent permanent magnets decreases, the forces between them increase, making assembly more difficult and causing permanent magnets to flip or collide. In severe cases, this can damage the permanent magnets and even cause personal injury.

[0004] In addition, since permanent magnets are manufactured by wire cutting, the dimensional tolerance caused by the wire cutting process may cause certain gaps between the permanent magnets, which affects the rotor magnetic circuit and its structural strength characteristics, thereby affecting the performance of the rotor. Summary of the Invention

[0005] One of the purposes of the present invention is to address the technical problems existing in the assembly of permanent magnets in existing rotors and to provide a rotor installation tool that is simple to assemble, safe and reliable.

[0006] The technical solution adopted by the present invention to solve its technical problems is: a rotor installation tool, including a detachable assembly base consisting of an upper half and a lower half, and a rotor yoke installed in the detachable assembly base for positioning a permanent magnet, the rotor yoke is provided with a groove structure adapted to the permanent magnet, the detachable assembly base is provided with a rotor bracket for supporting the rotor yoke and the permanent magnet, the hole in the center of the rotor bracket is respectively matched and positioned with the upper half and the lower half in the form of a key, and the surface of the detachable assembly base is provided with a detection ring for detecting whether the permanent magnet is assembled in place.

[0007] In the rotor installation tool, the rotor bracket and the detachable assembly base are clearance-fitted and positioned by a keyway, and the rotor bracket and the rotor yoke are connected together by interference fitting.

[0008] The rotor mounting fixture has a rotor yoke made of magnetic material, the upper and lower connecting parts are provided with connecting holes and are connected by base mounting bolts, and the upper and lower parts and the detection ring are all made of non-magnetic materials.

[0009] The rotor installation tool has radial threaded holes on the outer cylindrical surfaces of the upper and lower parts along the circumferential direction. During assembly, the permanent magnets are pressed at the threaded holes through permanent magnet pressing bolts and protective washers.

[0010] The present invention further provides a method for assembling an array structure permanent magnet based on the above-mentioned tooling, comprising the following steps:

[0011] Step 1: Heat-shrink the rotor bracket and the rotor yoke together;

[0012] Step 2: Connect the upper and lower parts of the detachable assembly base together using the base mounting bolts;

[0013] Step 3: Place the rotor bracket and rotor yoke assembly after shrinkage onto the detachable assembly base;

[0014] Step 4: After applying glue to the side of the permanent magnet that contacts the rotor yoke and both side surfaces, push the permanent magnet into the groove on the rotor yoke along the axial direction of the rotor bracket until the permanent magnet contacts the bottom surface of the detachable assembly base;

[0015] Step 5: Install a protective gasket into the radial gap between the permanent magnet and the detachable assembly base, and secure the permanent magnet by tightening the permanent magnet clamping bolts. The protective gasket is used to protect the surface of the permanent magnet from damage during rotor assembly.

[0016] Step 6: Insert the detection ring onto the installed permanent magnet. When the detection ring can be inserted and the distance between the bottom surface of the detection ring and the surface of the detachable assembly base is checked with a feeler gauge to meet the requirements, it means that the permanent magnet is installed in place in the axial and circumferential directions.

[0017] Step 7. After the permanent magnet is installed in place, wait for the magnet surface glue to solidify. After solidification, remove the permanent magnet clamping bolts and protective gaskets, apply mold release agent on the inner surface of the upper and lower halves of the detachable assembly base, and fill the gap between the permanent magnet and the detachable assembly base with potting glue. After completion, put it in the oven for solidification. After solidification, remove the base mounting bolts, disassemble the upper and lower halves, and take out the assembled rotor.

[0018] Compared with the prior art, the advantages of the present invention are: the rotor installation tool of the present invention installs the permanent magnet on the rotor yoke through the groove structure on the rotor yoke, effectively ensuring the accurate positioning of the permanent magnet, avoiding the permanent magnet from flipping over during rotor assembly, and pressing the permanent magnet through the mounting bolts on the detachable assembly base, further avoiding the phenomenon of flipping and collision caused by the interaction force becoming larger due to the close distance between the permanent magnets during assembly, reducing the installation difficulty, and ensuring the reliability and safety of the installation. The detection ring device avoids the collision between the measuring tool and the permanent magnet when using the measuring tool to directly detect whether the permanent magnet is installed in place. The detachable assembly base composed of the upper and lower parts solves the problem of the rotor being difficult to remove after potting. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the rotor structure including a detection ring according to the present invention;

[0020] Figure 2 This is a schematic diagram of the rotor structure without a detection ring according to the present invention;

[0021] Figure 3 This is a schematic structural diagram of the rotor installation tooling of the present invention;

[0022] Figure 4 It is a front view of the rotor yoke of the present invention;

[0023] Figure 5 This is a schematic structural diagram of the upper half of the detachable assembly base of the present invention;

[0024] Figure 6 A schematic diagram of the lower half of the detachable assembly base of the present invention;

[0025] Figure 7 This is a schematic diagram of the present invention when installing a permanent magnet;

[0026] Figure 8 This is a front view of the present invention when the permanent magnet is installed;

[0027] Figure 9 for Figure 8 AA cross-sectional structural diagram;

[0028] Figure 10 This is a schematic diagram of the inspection after the rotor of the present invention is installed.

[0029] Marking instructions in the figure: 1—upper part, 2—lower part, 3—rotor bracket, 4—rotor yoke, 5—permanent magnet, 6—base mounting bolt, 7—protective gasket, 8—permanent magnet tightening bolt, 9—detection ring. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementations.

[0031] like Figure 1 、 Figure 2 As shown, the rotor of this embodiment includes a rotor support 3, a rotor yoke 4 and a permanent magnet 5. The rotor yoke 4 is installed on the outer edge of the rotor support 3 by interference fit. The groove structure ( Figure 4 ) facilitates the positioning of the permanent magnet 5 during rotor assembly and prevents the permanent magnet 5 from flipping during rotor assembly.

[0032] The rotor installation tool of this embodiment includes the following Figure 3 The removable assembly base shown, the upper part 1 ( Figure 5 ) and the lower part 2 ( Figure 6 ) are connected together by the base mounting bolts 6. The upper and lower parts are convenient for disassembling the tooling after the rotor installation is completed. The permanent magnet 5 is glued to the surface of the rotor yoke 4. The permanent magnet 5 is positioned by the rotor yoke 4 to prevent the permanent magnet 5 from flipping over and plays a magnetic conductive role. The surface of the detachable assembly base is provided with a detection ring 9 for detecting whether the permanent magnet 5 is installed in place.

[0033] like Figures 7-9 As shown, the hole at the center of the rotor bracket 3 cooperates with the keyway structure on the upper part 1 and the lower part 2 through a key form, ensuring the accurate positioning of the rotor bracket 3. The array structure permanent magnet is assembled by permanent magnets whose magnetization directions are alternately arranged according to a certain pattern to form a Halbach structure. After the surface of the permanent magnet 5 is coated with glue, it is guided to the installation position by the groove structure on the rotor yoke 4.

[0034] In this embodiment, a permanent magnet clamping bolt 8 is also included for fixing the permanent magnet 5. Threaded holes matching the permanent magnet clamping bolt 8 are provided on the upper part 1 and the lower part 2. The permanent magnet clamping bolt 8 clamps the permanent magnet 5 by compressing the protective gasket 7, effectively avoiding the phenomenon that the distance between adjacent permanent magnets gradually decreases during assembly, resulting in an increase in the force between the permanent magnets, which makes assembly more difficult, and the permanent magnets flip or collide. The protective gasket 7 prevents damage to the surface coating of the permanent magnet 5 when tightening the permanent magnet clamping bolt 8.

[0035] In this embodiment, the upper part 1, the lower part 2, the detachable assembly base mounting bolts 6, the protective gasket 7, and the permanent magnet clamping bolts 8 are all made of non-magnetic materials, such as stainless steel or aluminum alloy.

[0036] This patent uses the above-mentioned rotor installation tool to install an array structure permanent magnet rotor composed of multiple permanent magnets with different magnetization directions. In a specific embodiment, the installation method of the array structure permanent magnet is as follows:

[0037] Step 1: Heat-shrink-fit the rotor bracket 3 and the rotor yoke 4 together.

[0038] Step 2: Connect the upper part 1 and the lower part 2 of the detachable assembly base together through the base mounting bolts 6.

[0039] Step 3: insert the rotor bracket 3 and the rotor yoke 4 into the detachable assembly base after shrinkage.

[0040] Step 4: After applying glue to the side of the permanent magnet 5 that contacts the rotor yoke 4 and both side surfaces, push the permanent magnet 5 into the groove portion on the rotor yoke 4 along the axial direction of the rotor bracket 3 until the permanent magnet 5 contacts the bottom surface of the detachable assembly base.

[0041] Step 5: Install the protective gasket 7 into the radial gap between the permanent magnet 5 and the detachable assembly base, and fix the permanent magnet 5 by tightening the permanent magnet clamping bolt 8. The protective gasket 7 is used to protect the surface of the permanent magnet 5 from damage during rotor assembly.

[0042] Step 6: Insert the detection ring 9 onto the installed permanent magnet 5. When the detection ring 9 can be inserted and the distance between the bottom surface of the detection ring 9 and the surface of the detachable assembly base is checked with a feeler gauge to meet the requirements, it means that the permanent magnet 5 is installed in place axially and circumferentially.

[0043] Step 7. After the permanent magnet 5 is installed in place, wait for the magnetic steel surface glue to solidify. After the solidification is completed, remove the permanent magnet clamping bolts 8 and the protective gasket 7, apply a release agent on the inner surface of the upper half 1 and the lower half 2 of the detachable assembly base, and fill the gap between the permanent magnet 5 and the detachable assembly base with potting glue. After completion, put it in the oven for solidification. After the solidification is completed, remove the base mounting bolts 6, disassemble the upper half 1 and the lower half 2 to take out the assembled rotor.

[0044] The groove structure of the rotor yoke 4 and the protective gasket 7 in the installation tool can prevent the permanent magnet 5 from flipping over and causing damage during assembly, thereby protecting the personal safety of the installer. The modules of the installation tool are independent of each other and easy to disassemble, making it easy to remove the potted rotor structure after assembly is completed. It has the advantages of simple operation, safety and reliability.

[0045] In a specific embodiment, the installation and detection method of the permanent magnet of the array structure is as follows: Figure 10 As shown, the detection ring 9 is inserted into the installed permanent magnet. When the detection ring can be inserted and the distance between the bottom surface of the detection ring and the surface of the detachable assembly base is checked with a feeler gauge to meet the requirements, it means that the permanent magnet is installed in place in the axial and circumferential directions.

[0046] Although the present invention has been described according to the above specific implementation methods, the technical solution of the present invention is not limited to this invention. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. A rotor assembly method, characterized in that: A rotor installation tool is used to install a permanent magnet rotor having an array structure composed of multiple permanent magnets with different magnetization directions. The rotor installation tool comprises a detachable assembly base composed of an upper half (1) and a lower half (2) and a rotor yoke (4) installed in the detachable assembly base for positioning the permanent magnet (5). The rotor yoke (4) is provided with a groove adapted to the permanent magnet (5). The detachable assembly base is provided with a rotor bracket (3) for supporting the rotor yoke (4) and the permanent magnet (5). The hole in the center of the rotor bracket (3) is positioned with the upper half (1) and the lower half (2) respectively by a key. The surface of the detachable assembly base is provided with a detection ring (9) for detecting the assembly of the permanent magnet (5). The method comprises the following steps: Step 1, heat-fitting the rotor bracket (3) and the rotor yoke (4) together; Step 2, connecting the upper part (1) and the lower part (2) of the detachable assembly base together through the base mounting bolts (6); Step 3, inserting the rotor bracket (3) and the rotor yoke (4) after heat-shrink fitting onto the detachable assembly base; Step 4, after applying glue to the contact surface between the permanent magnet (5) and the rotor yoke (4), push the permanent magnet (5) into the groove portion on the rotor yoke (4) along the axial direction of the rotor bracket (3) until the permanent magnet (5) contacts the bottom surface of the detachable assembly base; Step 5, insert the protective gasket (7) into the radial gap between the permanent magnet (5) and the detachable assembly base, and tighten the permanent magnet clamping bolt (8) to fix the permanent magnet (5); Step 6, insert the detection ring (9) onto the permanent magnet (5). When the detection ring (9) can be inserted and the distance between the bottom surface of the detection ring (9) and the surface of the detachable assembly base is checked with a feeler gauge to meet the requirements, it means that the permanent magnet (5) is installed in place in the axial and circumferential directions; Step 7. After the permanent magnet (5) is installed in place, wait for the magnetic steel surface glue to cure, remove the permanent magnet clamping bolts (8) and protective gaskets (7), apply a release agent to the inner surface of the upper half (1) and the lower half (2) of the detachable assembly base, fill the gap between the permanent magnet (5) and the detachable assembly base with potting glue, remove the base mounting bolts (6) after curing, disassemble the upper half (1) and the lower half (2) and take out the assembled rotor.

2. A rotor assembly method according to claim 1, characterized in that: The rotor bracket (3) and the detachable assembly base are clearance-fitted, and the rotor bracket (3) and the rotor yoke (4) are connected together through interference fitting.

3. A rotor assembly method according to claim 1, characterized in that: The rotor yoke (4) is made of a magnetic conductive material, the upper part (1) and the lower part (2) are connected via base mounting bolts (6), and the upper part (1), the lower part (2) and the detection ring (9) are all made of non-magnetic conductive materials.

4. A rotor assembly method according to claim 1, characterized in that: The outer surfaces of the upper part (1) and the lower part (2) are both provided with threaded holes in the circumferential direction.

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