A segmented misalignment device for a permanent magnet motor rotor core

Abstract

The utility model discloses a kind of segmented misplacement devices of permanent magnet motor rotor core, including press mounting pressure head, with the axial hole that can be supplied to the rotation shaft to pass through at own axis place;Press mounting base, with the axial hole that can be supplied to the rotation shaft to pass through at own axis place, press mounting base still has recess pit towards one end of press mounting pressure head;Limiting sleeve, each limiting sleeve is wrapped with one rotor core, and the inner wall of limiting sleeve is recessed with locating groove, and locating groove can be cooperated with the muscle line of the protruding outer wall of rotor core;Rotation shaft passes through rotor core, locating groove extends along the axis direction of limiting sleeve, two limiting sleeves are mislocated along circumference each other, and two limiting sleeves have physical cooperation piece for limiting circumferential mislocation angle between them, and the inner wall of recess pit can be contacted with the outer wall of one limiting sleeve. Adopt this utility model to realize circumferential positioning by the cooperation of locating groove and muscle line of limiting sleeve, and mislocation angle is accurately controlled by means of physical cooperation piece, and the assembly accuracy and efficiency of rotor core are improved.

Description

Technical Field

[0001] This utility model relates to the field of permanent magnet motor processing, specifically to a segmented misalignment device for the rotor core of a permanent magnet motor. Background Technology

[0002] Currently, brushless motors, servo motors, and permanent magnet synchronous motors are widely used. Under various operating conditions, the requirements for motor performance are becoming increasingly refined, such as high smoothness, low noise, and minimal jerking. To meet these demands, common methods include stator skew, rotor skew, and rotor segmentation / misalignment.

[0003] Among these methods, the stator skew slot method is generally suitable for manual winding applications, but its production efficiency is low and it requires highly skilled operators. The rotor skew pole method, on the other hand, requires high precision in the rotor die, resulting in higher die costs. Furthermore, there is significant material waste during the machining of the skew pole magnets, leading to higher overall costs. Utility Model Content

[0004] The problem to be solved by this utility model is to provide a segmented misalignment device for the rotor core of a permanent magnet motor.

[0005] To solve the above problems, this utility model provides a segmented misalignment device for the rotor core of a permanent magnet motor. To achieve the above objective, the technical solution adopted by this utility model to solve its technical problem is as follows:

[0006] A segmented misalignment device for a permanent magnet motor rotor core includes: a pressing head having an axial hole at its own axis through which a rotor shaft can pass; a pressing base having an axial hole at its own axis through which a rotor shaft can pass, and a recessed pit at one end of the pressing base facing the pressing head; and limiting sleeves, each limiting sleeve enclosing a rotor core, the inner wall of the limiting sleeve having a positioning groove that can engage with a protruding rib on the outer wall of the rotor core; wherein the rotor shaft passes through the rotor core, the positioning groove extends along the axial direction of the limiting sleeve, the two limiting sleeves are misaligned circumferentially, and a physical fitting component is provided between the two limiting sleeves to limit the circumferential misalignment angle, and the inner wall of the recessed pit can contact the outer wall of one of the limiting sleeves.

[0007] As a further improvement of this utility model, the physical fitting component includes a pin located on one end face of a limiting sleeve and a pin hole located on the other end face of a limiting sleeve.

[0008] As a further improvement of this utility model, the physical mating component includes a magnet located on the opposing end faces of the two limiting sleeves, and the magnet does not protrude outward from the end face of the limiting sleeve.

[0009] As a further improvement of this utility model, the inner wall of the limiting sleeve also includes a first concave surface and a second concave surface, and the junction of the first concave surface and the second concave surface is a step; the radius corresponding to the first concave surface is equal to the radius corresponding to the opening of the positioning groove, and the radius corresponding to the second concave surface is equal to the radius corresponding to the bottom of the positioning groove; the two sides of the first concave surface are the positioning groove and the step, respectively.

[0010] As a further improvement of this utility model, both sides of the second concave surface are stepped portions, and the central angle of the second concave surface is an integer multiple of the central angle of the first concave surface.

[0011] As a further improvement of this utility model, the surface contour of the stepped portion matches the half contour obtained by dividing the positioning groove along the central symmetry plane.

[0012] As a further improvement of this utility model, the shaft length of the limiting sleeve is less than the shaft length of the rotor core, the ribs are arranged circumferentially at equal intervals on the outer wall of the rotor core, and the junction of the two rotor cores and the junction of the two limiting sleeves are at the same cross-sectional position.

[0013] As a further improvement of this utility model, the bottom surface of the recessed pit has an upwardly protruding boss, the top of which can contact a rotor core, and the bottom surface of the recessed pit does not contact the shaft end of the limiting sleeve.

[0014] As a further improvement of this utility model, the offset angle between the pin hole and the positioning groove on the limiting sleeve is half of the circumferential misalignment angle between the two limiting sleeves.

[0015] As a further improvement of this utility model, the offset angle between the pin hole and the positioning groove on the limiting sleeve is 2°, and the circumferential misalignment angle between the two limiting sleeves is 4°.

[0016] The beneficial technical effects of using the segmented misalignment device for the rotor core of a permanent magnet motor according to this application are:

[0017] This device precisely defines the circumferential position of a single rotor core within the limiting sleeve by using the positioning groove on the inner wall of the limiting sleeve and the ribs on the outer wall of the rotor core, thus preventing core misalignment. Simultaneously, the physical mating parts between the two limiting sleeves clearly define the circumferential misalignment angle, effectively ensuring the accuracy of the misalignment between the two rotor core sections and solving the problem of difficult-to-control misalignment precision in traditional assembly.

[0018] Both the pressing head and the pressing base have axial holes at their axes for the rotor shaft to pass through, ensuring that the rotor shaft always runs along the axial direction when passing through the rotor core, thus preventing shaft misalignment. Furthermore, the inner wall of the recessed pit in the pressing base can contact the outer wall of the limiting sleeve, further radially positioning the limiting sleeve and the core as a whole, reducing the risk of deformation or damage to the core and rotor shaft during the pressing process.

[0019] The overall structure of the device consists of a pressing head, a pressing base, and a limiting sleeve. Each component has a clear functional division and no complex or redundant structure. During assembly, the rotor core only needs to be inserted into the limiting sleeve, passed through the rotor shaft, and placed between the pressing head and the base. The operation process is simple and can be adapted to conventional pressing procedures, improving the convenience and efficiency of segmented and staggered assembly of the rotor core.

[0020] Finally, compared to existing methods, rotor segment misalignment is simple to implement and incurs almost no additional cost. Its parts are easy to process and the operation is simple, ensuring precise misalignment without damaging or deforming the rotor core and shaft. It allows for stable and efficient press-fitting of the rotor core on the production site. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, 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.

[0022] Figure 1 This is an exploded view of one embodiment of the present invention;

[0023] Figure 2 This is a longitudinal sectional view of one embodiment of the present invention;

[0024] Figure 3 This is a perspective view of a limiting sleeve according to one embodiment of the present utility model;

[0025] Figure 4 This is an axial view of a limiting sleeve according to one embodiment of the present invention;

[0026] Figure 5 This is an assembly diagram of the limiting sleeve and rotor core according to one embodiment of this utility model.

[0027] Figure 6 This is an assembly diagram of the limiting sleeve and rotor core according to one embodiment of this utility model.

[0028] 10-Positioning groove; 11-Limiting sleeve; 12-Pin hole; 13-Magnet; 14-Pin; 15-First concave surface; 16-Second concave surface; 17-Step portion; 21-Rotor core; 211-Rib; 31-Pressure base; 311-Recess; 312-Boss; 32-Pressure head; 40-Rotor shaft; 401-Keyway; 402-Flange;

[0029] θ - Offset angle. Detailed Implementation

[0030] The present invention will be further described in detail below with reference to specific embodiments:

[0031] To achieve the purpose of this utility model, a segmented misalignment device for a permanent magnet motor rotor core includes: a pressing head 32, which has an axial hole at its own axis through which a rotor shaft 40 can pass; a pressing base 31, which also has an axial hole at its own axis through which the rotor shaft 40 can pass, and a recess 311 at one end of the pressing base 31 facing the pressing head 32; and a limiting sleeve 11, each limiting sleeve 11 enclosing one rotor core 21, with a positioning groove 10 recessed in the inner wall of the limiting sleeve 11, which can cooperate with the protruding ribs 211 on the outer wall of the rotor core 21. The rotor shaft 40 passes through the rotor core 21, and the positioning groove 10 extends along the axial direction of the limiting sleeve 11. Figure 6 As shown, the two limiting sleeves 11 are offset from each other circumferentially, and there is a physical fitting between the two limiting sleeves 11 that limits the circumferential offset angle. The inner wall of the recess 311 can contact the outer wall of one of the limiting sleeves 11.

[0032] The structure of this device is shown in the attached figure. Figure 1 The cross-section is shown in the attached figure. Figure 2 See attached diagram and Appendix 3 for details of the parts. Figure 4 Appendix Figure 5 .

[0033] To clearly demonstrate the misalignment after assembly Figure 6 The illustrations are in color, and the retainer sleeve 11 is semi-transparent. Additionally, to clearly display the surface of the retainer sleeve 11, Figure 5 The two limiting sleeves 11 are in a separated state, while Figure 6 The two limiting sleeves 11 are in a state of mutual contact.

[0034] Appendix Figure 1 This is the state before pressing. You can see that the parts or components are placed in order from bottom to top, waiting to be pressed.

[0035] Appendix Figure 2After press fitting, the rotor shaft is inserted into two staggered sections. The inner wall of the press fitting base 31 and the outer circle of the limiting sleeve 11 are in clearance fit. This clearance is smaller than the fit clearance between the inner hole of the press fitting base 31 and the rotor shaft 40. The press fitting head 32 and the upper end of the rotor shaft 40 are in loose fit, i.e., clearance fit. Its countersunk hole diameter is larger than the positioning step of the rotor shaft 40, and the countersunk hole height is equal to the positioning step height to protect the rotor core from warping.

[0036] The beneficial effects of adopting the above technical solution are: the device achieves precise circumferential positioning of a single iron core by cooperating with the positioning groove 10 on the inner wall of the limiting sleeve and the rib line 211 on the outer wall of the rotor iron core. At the same time, the physical mating parts between the two limiting sleeves 11 clearly set the misalignment angle, ensuring that the two sections of rotor iron core 21 are accurately misaligned, thereby improving assembly accuracy and consistency.

[0037] In some other embodiments of this utility model, the physical mating component includes a pin 14 located on the end face of one limiting sleeve 11 and a pin hole 12 located on the end face of the other limiting sleeve 11.

[0038] In addition, pin 14 has a chamfered end.

[0039] The beneficial effects of adopting the above technical solution are: by setting a pin 14 on one end face of the limiting sleeve 11 and a pin hole 12 on the other, a mechanical angle positioning structure is formed, which is easy and reliable to assemble, avoids circumferential offset, and improves the repeatability accuracy of the misalignment angle.

[0040] In some other embodiments of this utility model, the physical mating component includes a magnet 13 located on the opposing end faces of the two limiting sleeves 11, and the magnet 13 does not protrude beyond the end face of the limiting sleeve 11.

[0041] Magnet 13 is disc-shaped, and its diameter is larger than that of pin 14.

[0042] The pin hole 12 is a blind hole. Take two limiting sleeves 11, put in the pin 14 and glue one of them together to fix it. The other one is positioned by the pin 14 and fastened to the other. Because of the magnet 13, the two limiting sleeves 11 will be firmly attracted together.

[0043] The beneficial effects of adopting the above technical solution are as follows: using magnets 13 embedded in the end faces of the two limiting sleeves 11 for adsorption and positioning is another physical mating component that can be used in conjunction with the pins 14 without conflict. The magnets 13 do not protrude outwards and affect assembly, and can achieve quick alignment and fixation, which is especially suitable for scenarios with frequent disassembly and assembly, thus improving operational efficiency.

[0044] like Figure 3 , Figure 4As shown, in some other embodiments of this utility model, the inner wall of the limiting sleeve 11 further includes a first concave surface 15 and a second concave surface 16, and the junction of the first concave surface 15 and the second concave surface 16 is a step portion 17. The radius corresponding to the first concave surface 15 is equal to the radius corresponding to the opening of the positioning groove 10, and the radius corresponding to the second concave surface 16 is equal to the radius corresponding to the bottom of the positioning groove 10. The two sides of the first concave surface 15 are the positioning groove 10 and the step portion 17, respectively.

[0045] The beneficial effects of adopting the above technical solution are as follows: the inner wall of the limiting sleeve 11 is provided with a first concave curved surface 15, a second concave curved surface 16, and a stepped portion 17, which, together with the positioning groove 10, form a multi-level positioning structure, enhancing the coverage and guidance of the rotor core 21 and preventing twisting or displacement during the pressing process. Furthermore, there is no need for too many positioning grooves 10; otherwise, too many positioning grooves 10 would increase the difficulty of assembly and rotation, and also increase the workload of machining the positioning grooves 10. The space of the second concave curved surface 16 can accommodate multiple ribs 211, and the stepped portion 17 can also achieve a similar effect to the positioning groove 10.

[0046] In some other embodiments of this utility model, both sides of the second concave surface 16 are stepped portions 17, and the central angle of the second concave surface 16 is an integer multiple of the central angle of the first concave surface 15.

[0047] The beneficial effect of adopting the above technical solution is that the central angle of the second concave surface 16 is an integer multiple of the first concave surface 15, which facilitates the layout of other ribs 211 in the space of the second concave surface 16.

[0048] In some other embodiments of this utility model, the surface contour of the step portion 17 matches the half contour of the positioning groove 10 obtained by dividing it along the central symmetry plane.

[0049] The beneficial effect of adopting the above technical solution is that the surface contour of the step portion 17 matches half of the contour of the positioning groove 10. The step portion 17 can also play a similar role to the positioning groove 10, and one step portion 17 can play a unilateral circumferential limiting role.

[0050] In some other embodiments of this utility model, the shaft length of the limiting sleeve 11 is less than the shaft length of the rotor core 21, the stiffeners 211 are arranged circumferentially at equal intervals on the outer wall of the rotor core 21, and the junction of the two rotor cores 21 and the junction of the two limiting sleeves 11 are at the same cross-sectional position.

[0051] Appendix Figure 3 As a detail feature of the limiting sleeve 11, its positioning groove 10 corresponds to and loosely fits the ribs 211 on the rotor core 21. In this example, there are ten ribs 211. Two of them are symmetrically placed to facilitate insertion. The magnet 13 is placed in the countersunk hole and fixed with glue.

[0052] The beneficial effects of adopting the above technical solution are: the shaft length of the limiting sleeve 11 is less than the shaft length of the rotor core 21, and the junction of the two cores is aligned with the junction of the two limiting sleeves 11, ensuring that the pressing force is directly applied to the end face of the core, avoiding deformation of the limiting sleeve 11 under force, and protecting the integrity of the core structure.

[0053] like Figure 2 As shown, in some other embodiments of the present invention, the bottom surface of the recess 311 has an upwardly protruding boss 312, the top of the boss 312 is able to contact a rotor core 21, and the bottom surface of the recess 311 does not contact the shaft end of the limiting sleeve 11.

[0054] The beneficial effects of adopting the above technical solution are: the bottom surface of the recessed pit 311 is provided with a boss 312, which directly supports the rotor core 21 instead of the limiting sleeve 11, avoiding the deformation of the shaft end of the limiting sleeve 11 under pressure during the pressing process, and improving the stability of the entire component.

[0055] In some other embodiments of this utility model, the offset angle θ between the pin hole 12 and the positioning groove 10 on the limiting sleeve 11 is half of the mutual circumferential misalignment angle of the two limiting sleeves 11.

[0056] like Figure 4 As shown, the offset angle θ is the angle between the line connecting the geometric center of the positioning groove 10 to the center of the limiting sleeve 11 and the line connecting the geometric center of the pin hole 12 to the center of the limiting sleeve 11.

[0057] The beneficial effects of adopting the above technical solution are: the offset angle θ between the pin hole 12 and the positioning groove 10 is designed to be half of the total misalignment angle, so that the target misalignment angle is naturally formed when the two limiting sleeves 11 are engaged, without the need for additional adjustment, thereby improving assembly efficiency and angle accuracy.

[0058] In some other embodiments of this utility model, the offset angle between the pin hole 12 and the positioning groove 10 on the limiting sleeve 11 is 2°, and the circumferential misalignment angle between the two limiting sleeves 11 is 4°. Figure 6 The example in the text is a misalignment angle of 4°.

[0059] Appendix Figure 4 The pin hole 12 and the rotor positioning groove 10 are offset from the center by an angle of 2°, which is half of the total misalignment angle of 4°. The purpose is to ensure that the misalignment angle is 4° when the two limiting sleeves are engaged on the same surface.

[0060] In another embodiment, the press base 31 and the press head 32 are made of ordinary carbon steel that has been quenched and has a hardness of HRC50-55.

[0061] All embedded components must be chamfered. The outer edge of the shaft end of the limiting sleeve 11 must be chamfered.

[0062] like Figure 1As shown, the rotor shaft 40 includes a keyway 401 and a flange 402, with the flange 402 being concave-convexly limited to the shaft end of the press head 32.

[0063] All components of the segmented misalignment device for the rotor core of a permanent magnet motor disclosed in this application are machined and assembled coaxially, and their tolerances and fits are all designed coaxially. The limiting fits protect the rotor from deformation during the pressing process, thus ensuring the pressing quality to the maximum extent.

[0064] The pressing operation steps of the segmented misalignment device for a permanent magnet motor rotor core according to this application are as follows: First, take two rotor cores 21, and using the positioning groove 10 as the positioning point, insert them into the aforementioned spare locking and limiting sleeves from both ends. The operation is completed as shown in the attached figure. Figure 6 At this point, the two rotor segments have been misaligned. Next, the assembled rotor core and limiting sleeve are placed into the inner hole of the press-fit base 31. Then, the rotor shaft 40 is inserted from the top into the inner hole of the rotor core 21, and the press-fit head 32 is placed on top. Finally, the entire component is placed in a hydraulic press or servo press to complete the pressing process.

[0065] This application discloses a segmented misalignment device for a permanent magnet motor rotor core. Starting from a simple and practical process, it solves the problem of misaligned press-fitting of segmented rotor cores into the shaft, ensuring product quality. At the same time, this device has low manufacturing cost and is easy to manufacture, making it significant for promotion in the production processes of small and medium-sized motor enterprises.

[0066] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it. They should not be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the protection scope of this utility model.

Claims

1. A segmented misalignment device for the rotor core of a permanent magnet motor, characterized in that, include: The press head has an axial hole at its own axis that allows the rotor shaft to pass through; The press-fit base has an axial hole at its own axis that allows the rotor shaft to pass through, and the end of the press-fit base facing the press-fit head also has a recessed pit. Each limiting sleeve encloses a rotor core. The inner wall of the limiting sleeve has a positioning groove that can cooperate with the protruding ribs on the outer wall of the rotor core. The rotor shaft passes through the rotor core, the positioning groove extends along the axis of the limiting sleeve, the two limiting sleeves are circumferentially misaligned, and there is a physical fitting between the two limiting sleeves that limits the circumferential misalignment angle. The inner wall of the recessed pit can contact the outer wall of one of the limiting sleeves.

2. The segmented misalignment device for the rotor core of a permanent magnet motor according to claim 1, characterized in that: The physical fitting includes a pin located on one end face of a limiting sleeve and a pin hole located on the other end face of a limiting sleeve.

3. The segmented misalignment device for the rotor core of a permanent magnet motor according to claim 1, characterized in that: The physical fitting component includes magnets located on the opposing end faces of the two limiting sleeves, and the magnets do not protrude beyond the end faces of the limiting sleeves.

4. The segmented misalignment device for the rotor core of a permanent magnet motor according to claim 1, characterized in that: The inner wall of the limiting sleeve also includes a first concave surface and a second concave surface, and the junction of the first concave surface and the second concave surface is a step. The radius of the first concave surface is equal to the radius of the opening of the positioning groove, and the radius of the second concave surface is equal to the radius of the bottom of the positioning groove. The two sides of the first concave surface are a positioning groove and a step, respectively.

5. The segmented misalignment device for the rotor core of a permanent magnet motor according to claim 4, characterized in that: Both sides of the second concave surface are stepped portions, and the central angle of the second concave surface is an integer multiple of the central angle of the first concave surface.

6. The segmented misalignment device for the rotor core of a permanent magnet motor according to claim 4, characterized in that: The surface contour of the stepped portion matches the half-contour obtained by dividing the positioning groove along the central symmetry plane.

7. The segmented misalignment device for the rotor core of a permanent magnet motor according to claim 1, characterized in that: The shaft length of the limiting sleeve is less than the shaft length of the rotor core. The ribs are arranged circumferentially at equal intervals on the outer wall of the rotor core. The junction of the two rotor cores and the junction of the two limiting sleeves are located in the same cross-sectional position.

8. The segmented misalignment device for the rotor core of a permanent magnet motor according to claim 7, characterized in that: The bottom surface of the recess has an upwardly protruding boss, the top of which can contact a rotor core, and the bottom surface of the recess does not contact the shaft end of the limiting sleeve.

9. The segmented misalignment device for the rotor core of a permanent magnet motor according to claim 2, characterized in that: The offset angle between the pin hole and the positioning groove on the limiting sleeve is half of the circumferential misalignment angle between the two limiting sleeves.

10. The segmented misalignment device for the rotor core of a permanent magnet motor according to claim 9, characterized in that: The offset angle between the pin hole and the positioning groove on the limiting sleeve is 2°, and the circumferential misalignment angle between the two limiting sleeves is 4°.

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