Motor magnetic steel sheet fixing device and method

Abstract

The invention discloses a motor magnetic steel sheet fixing device and method, a plurality of magnetic steel sheets are bonded in grooves arranged at intervals along the circumferential direction of a motor base, and the fixing device comprises a support, a rotating shaft, a bearing, a limiting assembly and a gasket; one end of the rotating shaft is used for rotating the rotating shaft, and the other end of the rotating shaft is fixedly connected with the base; the limiting assembly is arranged on the support and located above the side where the machine base is located. When the rotating shaft drives the machine base to rotate to each machine base groove, the limiting assembly limits rotation of the rotating shaft. And the gasket is used for isolating the magnetic steel sheet from the side wall of the groove and is taken out after the current magnetic steel sheet is bonded. The problem of cracking of the magnetic steel sheet in a high-low temperature or vibration environment can be avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of motor assembly, and in particular to a device and method for fixing a motor magnetic steel sheet. Background Art

[0002] To fix the existing magnetic steel sheets, generally use a brush dipped in glue to apply it to the surface of the machine base groove, then manually push the magnetic steel sheet directly to the adhesive surface, and then use one end face of the machine base as a reference, close to the reference platform, and align the end face of the magnetic steel sheet with the reference platform. After all the magnetic steel sheets are assembled in sequence and dried and cured, the magnetic steel sheet assembly is completed.

[0003] During the fixing process of the magnetic steel sheet using the above method, it is inevitable that the magnetic steel sheet will contact the edge of the machine base slot or the gap will be too small after fixing. Due to the different materials and thermal expansion coefficients of the magnetic steel sheet and the machine base, the magnetic steel sheet and the machine base will generate contact stress in high and low temperature environments, which may cause the magnetic steel sheet to crack and affect the normal operation of the system. When the magnetic steel sheet is bonded, it cannot be guaranteed that its end face does not protrude from the end face of the machine base, which affects the assembly efficiency. Summary of the invention

[0004] In view of this, the present invention provides a device and method for fixing a motor magnetic steel sheet, which can avoid the problem of cracking of the magnetic steel sheet in high and low temperature or vibration environments.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A motor magnetic steel sheet fixing device, wherein a plurality of magnetic steel sheets are bonded into grooves arranged at intervals along the circumference of a motor base, and the fixing device comprises a bracket, a rotating shaft, a bearing, a limit assembly and a gasket;

[0007] The rotating shaft is installed on the bracket through a bearing, one end of which is used to rotate the rotating shaft, and the other end is used to be fixedly connected to the base; the limiting assembly is arranged on the bracket and is located above the side where the base is located;

[0008] When the rotating shaft drives the machine base to rotate to each machine base groove, the limit assembly limits the rotation of the rotating shaft; the gasket is used to isolate the magnetic steel sheet from the side wall of the groove and is removed after the current magnetic steel sheet is bonded.

[0009] Furthermore, one end of the rotating shaft is fixedly connected to the handwheel, and the other end face is provided with a circular boss for engaging with the inner hole at one end of the machine base. The height of the circular boss ensures that the magnetic steel sheet does not protrude from the other end face of the machine base after bonding.

[0010] Furthermore, the limiting assembly includes a support frame, a pull rod, a pressure ring, a spring and a pin;

[0011] A step through hole is provided in the support frame along the vertical direction, the upper end of the step through hole is a small diameter section, and the lower end is a large diameter section, the pressure ring is fixed at the bottom of the step through hole, and the spring is located in the large diameter section of the step through hole; a through hole is provided in the radial direction at the upper end of the pull rod, the pin shaft is installed in the through hole, and both ends of the pin shaft are mounted on the top of the support frame; an annular boss is provided in the middle part of the pull rod, which is used to engage and limit with the step surface and the pressure ring in the step through hole of the support frame; the lower end of the pull rod extends from the bottom of the step through hole through the spring, which is used to lock with the clearance of the limiting hole on the rotating shaft, and the limiting hole corresponds to the number and position of the groove.

[0012] Furthermore, the limiting hole on the rotating shaft is a combination hole of a radial blind hole and a notch, and the notch is arranged along the circumferential direction; the top of the supporting frame is provided with a deep and shallow cross groove with the step through hole as the center, and the deep groove and the shallow groove both penetrate the end face of the supporting frame, and the groove depths of the same straight line are consistent, which is used to set up the pin shaft; when the pin shaft is set in the deep groove, the pull rod extends into the radial blind hole, and the rotating shaft is locked by forward rotation, and the rotating shaft is moved out through the notch and enters the next radial blind hole by reverse rotation; when the pin shaft is set in the shallow groove, the pull rod does not contact the limiting hole.

[0013] Furthermore, the pull rod is a cylindrical structure, and the bottom end is hemispherical.

[0014] The present invention also provides a method for fixing a motor magnetic steel sheet, using the above-mentioned fixing device, and the fixing method has the following steps:

[0015] Step 1: The base is fixed to the end face of the shaft, ensuring that the circular boss on the end face of the shaft is engaged with the inner hole of the base;

[0016] Step 2: Lift the pin shaft and place it in the deep groove on the end face of the support frame so that the bottom end of the pull rod is placed in the radial blind hole of the rotating shaft;

[0017] Step 3: Fix the gasket to one side of the magnetic steel sheet by the magnetic force of the magnetic steel sheet;

[0018] Step 4: Apply glue to the bottom surface of the base groove, push the magnetic steel sheet together with the gasket from the outer end surface of the base until the magnetic steel sheet abuts against the end surface of the shaft, and at the same time make the gasket fit against the side wall of the base groove, which is the side where the radial blind hole is located; press the magnetic steel sheet to keep it still and remove the gasket;

[0019] Step 5: Turn the hand wheel, and when the pull rod falls into the next radial blind hole of the shaft again, stop turning the hand wheel;

[0020] Step 6: Repeat steps 4 and 5 until all magnetic steel sheets are bonded to the base;

[0021] Step 7: Remove the base with the magnetic steel sheet bonded to it and dry it to complete the assembly of the magnetic steel sheet.

[0022] Furthermore, the step 3 also includes calculating the thickness of the gasket, the method is as follows: setting the length of the base groove to The length of the base groove is the distance between the two groove side walls; the length of the magnetic steel sheet is The length of the magnetic steel sheet and the length of the machine base groove are in the same direction. The minimum distance between the magnetic steel sheet and the side wall of the machine base groove after it is centered and fixed relative to the machine base groove is calculated to be (A-B+b+d) / 2, that is, the gasket thickness ≥ (A-B+b+d) / 2.

[0023] Further, the gasket is modified using a feeler gauge according to the calculated gasket thickness.

[0024] Beneficial effects:

[0025] 1. The present invention uses a gasket to fix the magnetic steel sheet together with the gasket and sticks it into the groove of the base. After the magnetic steel sheet is bonded, the gasket is removed to ensure a safe distance between the magnetic steel sheet and the side wall of the base groove after bonding, avoiding a gap that is too small, which may cause the magnetic steel sheet to be squeezed and cracked due to the different thermal expansion coefficients of the magnetic steel sheet and the base in high and low temperature environments.

[0026] 2. The end face of the rotating shaft of the present invention is designed with a circular boss, which is snap-fitted with the inner hole at one end of the base, so as to ensure that the magnetic steel sheet does not protrude from the other end face of the base after being fixed. When the motor is actually in use, the magnetic steel sheet will not contact the side wall of the base groove, so as to avoid stress on the magnetic steel sheet during installation, which may cause cracking of the magnetic steel sheet in a vibration or impact environment. The distance between the magnetic steel sheet and the end face of the base and the side face of the base groove can be ensured by one assembly, thereby improving the assembly efficiency.

[0027] 3. The cooperation between the limiting assembly of the present invention and the limiting hole of the rotating shaft can ensure one-way rotation and automatic locking / unlocking during the bonding process, avoiding manual repeated unlocking of the limiting assembly, and is more convenient to use.

[0028] 4. The present invention provides a method for calculating the thickness of the gasket, which can ensure that the magnetic steel sheet will not contact the groove wall of the machine base when installed under the limit size and limit temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a cross-sectional view of the overall structure of the present invention.

[0030] Figure 2 for Figure 1 Isometric drawing of .

[0031] Figure 3 A schematic diagram of the structure of the support frame.

[0032] Figure 4 This is a structural diagram of the support frame from another perspective.

[0033] Figure 5 This is the main view of the shaft.

[0034] Figure 6 Isometric view of the rotating shaft.

[0035] Figure 7 for Figure 5 Cross-section view in BB direction.

[0036] Among them, 1- bracket, 2- bearing Ⅰ, 3- rotating shaft, 4- hand wheel, 5- pressure ring Ⅰ, 6- bearing Ⅱ, 7- support frame, 8- pin shaft, 9- pull rod, 10- spring, 11- pressure ring Ⅱ, 12- machine base, 13- gasket, 14- magnetic steel sheet. DETAILED DESCRIPTION

[0037] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0038] The present invention provides a motor magnetic steel sheet fixing device for bonding a plurality of magnetic steel sheets 14 in grooves spaced apart along the circumference of a motor base 12. The fixing device comprises a bracket 1, a rotating shaft 3, a bearing I2, a bearing II6, a limit assembly and a gasket 13.

[0039] The rotating shaft 3 is a T-shaped rotating shaft, including a horizontal part and a vertical part. The T-shaped rotating shaft is installed horizontally. The two ends of the vertical part of the rotating shaft 3 are respectively installed on the bracket 1 through bearings Ⅰ2 and bearings Ⅱ6. One end of the rotating shaft 3 (the end of the vertical part) is used to rotate the rotating shaft 3, and the other end of the rotating shaft 3 (the end face of the horizontal part) is used to be fixedly connected with the machine base 12; the limiting assembly is arranged on the bracket 1 and is located above the side where the machine base 12 is located; when the rotating shaft 3 drives the machine base 12 to rotate to each groove of the machine base 12, the limiting assembly limits the rotation of the rotating shaft 3; the gasket 13 is used to isolate the magnetic steel sheet 14 from the side wall of the groove, and is taken out after the current magnetic steel sheet 14 is bonded.

[0040] like Figure 1 , Figure 2 As shown, in this embodiment, the bracket 1 is a concave structure, bearing mounting holes are processed in the center of the two side facades and reinforcing ribs are provided, and two threaded holes are provided at the top of one of the facades for installing the limit assembly.

[0041] One end of the rotating shaft 3 is fixedly connected to the hand wheel 4, and the other end face is provided with a circular boss for clamping with the inner hole of one end of the machine base 12. The height of the circular boss ensures that the magnetic steel sheet 14 does not protrude from the other end face of the machine base 12 after the bonding is completed. One end of the rotating shaft 3 is also provided with a thread that cooperates with the pressing ring Ⅰ5, and the other end face of the rotating shaft 3 is provided with a threaded hole for installing the machine base 12.

[0042] Furthermore, the pressing ring Ⅰ5 is a circular ring structure, and the inner hole is processed with a thread matching the rotating shaft 3, and after being fixed with the rotating shaft 3, the rotating shaft 3 is prevented from axial movement. One end of the hand wheel 4 is processed into a petal-like shape for easy handholding, and the other end is processed with an internal thread matching the rotating shaft 3.

[0043] The limit assembly includes a support frame 7, a pull rod 9, a pressure ring II 11, a spring 10 and a pin 8; Figure 3 , Figure 4 As shown, the lower end of the support frame 7 is provided with a horizontally protruding flange for fixing with the bracket 1, and the flange is provided with two through holes. A step through hole is provided in the support frame 7 along the vertical direction, and the upper end of the step through hole is a small diameter section and the lower end is a large diameter section. The pressure ring II 11 is fixed at the bottom of the step through hole to prevent the pull rod 9 from falling out; the pressure ring II 11 is a circular ring structure, and is processed with an external thread that matches the support frame 7; the spring 10 is located in the large diameter section of the step through hole; the upper end of the pull rod 9 is provided with a through hole in the radial direction, and the pin shaft 8 is installed in the through hole, and the two ends of the pin shaft 8 are mounted on the top of the support frame 7; the middle part of the pull rod 9 is provided with an annular boss for engaging with the step surface and the pressure ring II 11 in the step through hole of the support frame 7; the lower end of the pull rod 9 passes through the spring 10 and extends from the bottom of the step through hole of the support frame 7, and is used to lock with the gap of the limiting hole on the rotating shaft 3, and the limiting hole corresponds to the number and position of the grooves (the number of bonding magnetic steel sheets 14). Locking or unlocking can be achieved by inserting or pulling out the pull rod 9 from the limiting hole.

[0044] As an improvement, Figure 5 , Figure 6 , Figure 7 As shown, the limiting hole on the rotating shaft 3 is a combination hole of a radial blind hole and a notch, and the notch is arranged along the circumferential direction; the top of the support frame 7 is provided with a deep and shallow cross groove with the step through hole as the center, and the deep groove and the shallow groove both penetrate the end face of the support frame 7, and the groove depths of the same straight line are consistent, which is used to set up the pin 8; when the pin 8 is set up in the deep groove, the pull rod 9 extends into the radial blind hole of the rotating shaft 3, and the rotating shaft 3 is locked by forward rotation, and the rotating shaft 3 is pulled out through the notch and enters the next radial blind hole by reverse rotation; when the pin 8 is set up in the shallow groove, the pull rod 9 does not contact the limiting hole of the rotating shaft 3. When the pull rod 9 is working, the pin 8 is placed in the deep groove processed at the end of the support frame 7. When viewed from the hand wheel 4 end, the hand wheel 4 is turned counterclockwise, and the pull rod 9 slides out along the notch of the rotating shaft 3. When the rotating shaft 3 rotates to the next limiting hole, the pull rod 9 enters the next radial blind hole under the elastic force of the spring 10. When the hand wheel 4 is turned in the opposite direction, it cannot rotate because the limiting hole is a unidirectional notch and the pull rod 9 is limited; thus, the unidirectional rotation and automatic locking / unlocking of the rotating shaft 3 can be achieved. When the pull rod 9 is not working, the pin 8 is pulled up to the shallow groove processed at the end of the support frame 7. At this time, the rotating shaft 3 is not restricted from rotating in two directions. Preferably, the pull rod 9 is a cylindrical structure with a hemispherical bottom.

[0045] The present invention also provides a method for fixing a motor magnetic steel sheet, using the above-mentioned fixing device, and the fixing method has the following steps:

[0046] Step 1: The base 12 is fixed to the end face of the rotating shaft 3 by screws, ensuring that the circular boss on the end face of the rotating shaft 3 is snap-fitted into the inner hole of the base 12 .

[0047] Step 2: Lift the pin 8 and place it in the deep groove on the end surface of the support frame 7, so that the bottom end of the pull rod 9 is placed in the radial blind hole of the rotating shaft 3.

[0048] Step 3: Calculate the thickness of the gasket 13: Set the length of the groove of the base 12 to The length of the groove of the base 12 is the distance between the two groove side walls; the length of the magnetic steel sheet 14 is The length of the magnetic steel sheet 14 is in the same direction as the length of the groove of the base 12. The minimum distance between the magnetic steel sheet 14 and the side wall of the groove of the base 12 after the magnetic steel sheet 14 is fixed in the center relative to the groove of the base 12 is calculated to be (A-B+b+d) / 2. The magnetic steel sheet 14 and the base 12 are made of different materials and have different thermal expansion coefficients. According to the thermal expansion coefficient and the high and low temperature environment requirements of the motor, the minimum gap between the magnetic steel sheet 14 and the base 12 at the extreme temperature is calculated. During the design, the gap between the two is ensured to be no less than (A-B+b+d) / 2, that is, the thickness of the gasket 13 is ≥(A-B+b+d) / 2. The gasket 13 can be modified using a feeler gauge based on the calculated thickness of the gasket 13. Then the gasket 13 is fixed to one side of the magnetic steel sheet 14 by the magnetic force of the magnetic steel sheet 14.

[0049] Step 4: Apply glue to the bottom surface of the groove of the base 12, push the magnetic steel sheet 14 together with the gasket 13 from the outer end surface of the base 12 until the magnetic steel sheet 14 abuts against the end surface of the shaft 3, and at the same time, make the gasket 13 fit with the side wall of the groove of the base 12, which is the side where the radial blind hole is located, to prevent the shaft 3 from rotating in the other direction; press the magnetic steel sheet 14 to keep it still and remove the gasket 13;

[0050] Step 5: Turn the hand wheel 4, and when the pull rod 9 falls into the next radial blind hole of the rotating shaft 3 again, stop the hand wheel 4 from turning;

[0051] Step 6: Repeat steps 4 and 5 until all magnetic steel sheets 14 are bonded to the base 12;

[0052] Step 7: Remove the base 12 with the magnetic steel sheet 14 bonded thereto and dry it, thereby completing the assembly of the magnetic steel sheet 14.

[0053] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A motor magnetic steel sheet fixing device, wherein a plurality of magnetic steel sheets are bonded into grooves spaced apart along the circumference of a motor base, characterized in that: The fixing device includes a bracket, a rotating shaft, a bearing, a limit assembly and a gasket; The rotating shaft is installed on the bracket through a bearing, one end of which is used to rotate the rotating shaft, and the other end is used to be fixedly connected to the base; the limiting assembly is arranged on the bracket and is located above the side where the base is located; When the rotating shaft drives the machine base to rotate to each machine base groove, the limit assembly limits the rotation of the rotating shaft; the gasket is used to isolate the magnetic steel sheet from the side wall of the groove and is removed after the current magnetic steel sheet is bonded.

2. The motor magnetic steel sheet fixing device according to claim 1, characterized in that: One end of the rotating shaft is fixedly connected to the hand wheel, and the other end face is provided with a circular boss for engaging with the inner hole at one end of the machine base. The height of the circular boss ensures that the magnetic steel sheet does not protrude from the other end face of the machine base after bonding.

3. The motor magnetic steel sheet fixing device according to claim 1 or 2, characterized in that: The limiting assembly includes a support frame, a pull rod, a pressure ring, a spring and a pin; A step through hole is provided in the support frame along the vertical direction, the upper end of the step through hole is a small diameter section, and the lower end is a large diameter section, the pressure ring is fixed at the bottom of the step through hole, and the spring is located in the large diameter section of the step through hole; a through hole is provided in the radial direction at the upper end of the pull rod, the pin shaft is installed in the through hole, and both ends of the pin shaft are mounted on the top of the support frame; an annular boss is provided in the middle part of the pull rod, which is used to engage and limit with the step surface and the pressure ring in the step through hole of the support frame; the lower end of the pull rod extends from the bottom of the step through hole through the spring, which is used to lock with the clearance of the limiting hole on the rotating shaft, and the limiting hole corresponds to the number and position of the groove.

4. The motor magnetic steel sheet fixing device according to claim 3, characterized in that: The limiting hole on the rotating shaft is a combination hole of a radial blind hole and a notch, and the notch is arranged along the circumferential direction; the top of the support frame is provided with deep and shallow cross grooves with the step through hole as the center, and the deep groove and the shallow groove both penetrate the end face of the support frame, and the groove depths of the same straight line are consistent, which is used to set up the pin shaft; when the pin shaft is set in the deep groove, the pull rod extends into the radial blind hole, and the rotating shaft is locked when it rotates forward, and the rotating shaft is moved out through the notch and enters the next radial blind hole when it rotates reversely; when the pin shaft is set in the shallow groove, the pull rod does not contact the limiting hole.

5. The motor magnetic steel sheet fixing device according to claim 4, characterized in that: The pull rod is a cylindrical structure, and the bottom end is hemispherical.

6. A method for fixing a motor magnetic steel sheet, characterized in that: Using the fixing device as claimed in claim 4 or 5, the fixing method steps are as follows: Step 1: The base is fixed to the end face of the shaft, ensuring that the circular boss on the end face of the shaft is engaged with the inner hole of the base; Step 2: Lift the pin shaft and place it in the deep groove on the end face of the support frame so that the bottom end of the pull rod is placed in the radial blind hole of the rotating shaft; Step 3: Fix the gasket to one side of the magnetic steel sheet by the magnetic force of the magnetic steel sheet; Step 4: Apply glue to the bottom surface of the base groove, push the magnetic steel sheet together with the gasket from the outer end surface of the base until the magnetic steel sheet abuts against the end surface of the shaft, and at the same time make the gasket fit against the side wall of the base groove, which is the side where the radial blind hole is located; press the magnetic steel sheet to keep it still and remove the gasket; Step 5: Turn the hand wheel, and when the pull rod falls into the next radial blind hole of the shaft again, stop turning the hand wheel; Step 6: Repeat steps 4 and 5 until all magnetic steel sheets are bonded to the base; Step 7: Remove the base with the magnetic steel sheet bonded to it and dry it to complete the assembly of the magnetic steel sheet.

7. The method for fixing the motor magnetic steel sheet according to claim 6, characterized in that: The step 3 also includes calculating the thickness of the gasket, the method is as follows: set the length of the base groove to The length of the base groove is the distance between the two groove side walls; the length of the magnetic steel sheet is The length of the magnetic steel sheet and the length of the machine base groove are in the same direction. The minimum distance between the magnetic steel sheet and the side wall of the machine base groove after it is centered and fixed relative to the machine base groove is calculated to be (A-B+b+d) / 2, that is, the gasket thickness ≥ (A-B+b+d) / 2.

8. The method for fixing the motor magnetic steel sheet according to claim 7, characterized in that: The gasket is modified using a feeler gauge according to the calculated gasket thickness.

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