A lamination stacking tool for a skewed slot rotor core
By using slanted keyways and positioning ribs to limit the slots of the rotor core laminations, the problem of offset during the pressing process of the slanted rotor core laminations is solved, achieving high-precision lamination of the rotor core and improving the overall performance of the motor.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SHAANXI AEROSPACE TIMES NAVIGATION EQUIP CO LTD
- Filing Date
- 2022-05-13
- Publication Date
- 2026-06-09
AI Technical Summary
The laminations of the skewed rotor core are prone to shifting during the pressing process, which leads to a decrease in accuracy and affects the neatness of the rotor core and the performance of the motor.
The structure employs a slanted keyway and positioning ribs. The slanted keys and positioning ribs within the slanted keyway limit the slot openings of the rotor core lamination assembly. Combined with the limiting posts and clamping device, this ensures that the lamination assembly remains aligned during the clamping process.
This effectively improves the precision and uniformity of the rotor core, ensuring the normal performance of the motor.
Smart Images
Figure CN114899994B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to rotor core tooling, specifically to a lamination and stacking tooling for a skewed rotor core. Background Technology
[0002] The rotor core is used in aerospace, aviation, and marine fields, all of which require high precision. It is an important component of miniature angular displacement sensors, rotary transformers, and motors. The rotor core is composed of several laminations, each lamination is coated with glue and glued together, the laminations are pressed together, and then heated at high temperature to finally produce the rotor core. Therefore, the precision, neatness, tightness of stacking, and flatness of the two end faces of the rotor core are crucial to the performance indicators of the whole machine.
[0003] Currently, laminations are divided into two types: straight slots and skewed slots. Straight slots are easy to machine through positioning, but skewed slot rotor cores are pressed into laminations by an upper pressure plate and a base. The pressure of the pressure plate on the laminations may cause slight displacement of the laminations. When pressing the skewed slot laminations, if there is no limit to the laminations, the laminations of the skewed slot rotor core are prone to displacement, which makes it impossible to ensure that the slots of each lamination are aligned, thus affecting the accuracy of the rotor core and the subsequent use of the motor. Summary of the Invention
[0004] To address the shortcomings of the prior art, this invention provides a skew slot lamination stacking fixture that ensures slot alignment of the skew slot lamination group during stacking, thereby guaranteeing the accuracy of the rotor core.
[0005] The technical solution of the present invention is: a lamination stacking fixture for a skewed rotor core, comprising a base and a pressure plate, a positioning post provided on the base and the positioning post passing through the pressure plate, a skewed keyway provided on the base, a skewed key movably provided in the skewed keyway, a positioning rib provided on the skewed key to lock the slot of the rotor core lamination assembly, and the skewed keyway, the skewed key and the positioning rib having the same inclination angle, a limiting post fixed on the base for limiting the thickness of the rotor core lamination assembly, and a clamping device provided between the base and the pressure plate.
[0006] Preferably, at least two slanted keys are provided on the base.
[0007] Preferably, the keyway and the key are in an overfitting configuration.
[0008] Preferably, a compression spring is provided in the keyway, and the compression spring presses against the key.
[0009] Preferably, the clamping device includes a bolt and a nut.
[0010] Preferably, the bolt is hinged to the base.
[0011] The beneficial effects of this invention are as follows: This invention uses a slanted key to position the slots of the rotor core lamination group, ensuring that the slots of the slanted slot lamination group are aligned during stacking, thus ensuring the accuracy of the rotor core. This invention is easy to operate and has a simple structure. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the structure of the present invention;
[0013] Figure 2 This is an exploded view of the structure of the present invention;
[0014] Figure 3 This is a schematic diagram of a slanted key structure;
[0015] Figure 4 This is a cross-sectional view of the inclined slot lamination tooling of Embodiment 1;
[0016] Figure 5 This is a cross-sectional view of the inclined groove lamination tooling of Embodiment 2. Detailed Implementation
[0017] To make the technical problems, technical solutions and advantages of the present invention clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.
[0018] The technical solution of this invention is as follows: a lamination stacking fixture for a skewed rotor core, such as... Figure 1 As shown, the system includes a base 1 and a pressure plate 2. A bearing needs to be installed inside the rotor core, therefore the rotor core laminations are annular. If the rotor core laminations are placed directly on the base, the laminations will shift during the pressing process, affecting their accuracy. Therefore, as shown... Figure 2 As shown, a positioning post 3 is provided on the base 1, and the rotor core laminations can be installed on the positioning post. The positioning post 3 prevents the core laminations from moving radially. An oblique keyway 4 is obliquely opened on the base 1, and an oblique key 5 is movably provided in the oblique keyway 4. A positioning rib 6 is provided on the oblique key 5 to lock the slot of the rotor core laminations. The oblique keyway 4, oblique key 5 and positioning rib 6 have the same inclination angle. In this way, when the laminations are pressed down by the pressure plate, the rotor core laminations are pressed downward by the pressure plate 2, and the positioning ribs position the slot of the rotor core laminations to prevent the rotor core laminations from shifting. A limiting post 7 is fixed on the base 1 to limit the thickness of the rotor core laminations. The limiting post is fixed and cannot move. When the pressure plate contacts the end face of the limiting post, the pressure plate cannot continue to move downward, thus limiting the thickness of the rotor core laminations. Since the laminations need to be pressed by the pressure plate, a clamping device 8 is provided between the base 1 and the pressure plate 2.
[0019] If only one inclined key is provided on the base 1, the positioning effect of the rotor core laminations will be poor. Therefore, at least two inclined keys 5 should be provided on the base 1, such as...Figure 3 As shown, it is best to symmetrically set two oblique keys, which provides a good positioning effect for the rotor core laminations. Furthermore, the positioning ribs and oblique keyways should have a small clearance fit to avoid excessive wear of the positioning ribs, which could cause unevenness in the lamination slots. The width L of the positioning ribs should be precisely calculated.
[0020] L=(k-δ*sin(b))*cos(b)
[0021] Where b = 90 ° -a is the angle of the skew groove of the laminate group; a is the inclination angle of the skew key; δ is the thickness of the laminate (mm); k is the width of the laminate groove (mm).
[0022] Since the slanted key is movable within the slanted keyway, if the gap between the slanted key and the slanted keyway is too large, the slanted key will become loose within the slanted keyway and can easily fall out. Therefore, this invention provides two embodiments.
[0023] This first embodiment: Based on the above structure, as follows Figure 4 As shown, the keyway 4 and the key 5 are in an overfitting configuration. When the key is not under the pressure of the pressure plate, it can be stuck at the high point of the keyway 4. When the key is under the pressure of the pressure plate, the key slides downward in the keyway 4.
[0024] This second embodiment: Based on the above structure, as follows Figure 5 As shown, a compression spring 9 is installed in the keyway 4. The compression spring 9 presses against the key 5. At this time, the key 5 is located at the high point. When the key is subjected to the pressure of the pressure plate, the key moves downward in the keyway 4, causing the compression spring to deform. After the assembly is completed, the pressure plate moves upward, and the compression spring resets, causing the key to return to the high point position for the next stacking of the rotor core. This improves assembly efficiency and makes pressing convenient.
[0025] The clamping device 8 includes a bolt 81 and a nut 82. The bolt 81 is hinged to the base 1, and the nut is installed on the bolt. Both the base and the pressure plate have U-shaped grooves for the bolt to rotate. When installing the rotor core laminations, the rotor core laminations are placed in, the pressure plate is closed, and then the bolt is rotated into the U-shaped groove on the pressure plate. The nut is then tightened to press the pressure plate against the rotor core laminations. The operation is simple. However, if only one clamping device is installed on the base, the nut will cause the pressure plate to press down only to one side, resulting in an unbalanced downward pressure. Therefore, to maintain the balance of the downward pressure, such as... Figure 1 and Figure 2 As shown, clamping devices are symmetrically arranged on both sides of the base.
[0026] Working process: A layer of polytetrafluoroethylene film is placed on the base to facilitate demolding. Each layer of the rotor core laminations is sprayed with epoxy resin. Then, the rotor core laminations are installed on the positioning posts until the required number of rotor core laminations is reached. The positioning posts are then passed through the pressure plate so that the pressure plate contacts the rotor core laminations. The nut is then turned so that the pressure plate is downward, applying pressure to the rotor core laminations. The pressure plate presses the rotor core lamination assembly tightly. Finally, the rotor core lamination assembly and the lamination fixture are placed in the heating box and heated according to the lamination temperature requirements. After the temperature stabilizes, the nuts are tightened a second time. The pressure plate drives the inclined key to slide downward until the limit post contacts the end face of the pressure block, completing the assembly.
[0027] The present invention provides a lamination and stacking fixture for a skewed rotor core, which is suitable for miniature angular displacement sensors, rotary transformers and motors with small bases and an outer diameter of less than 20mm for the core.
[0028] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of protection of the present invention.
Claims
1. A lamination and pressing fixture for a miniature skewed rotor core, comprising a base (1) and a pressure plate (2), characterized in that: A positioning post (3) is provided on the base (1), and the positioning post (3) passes through the pressure plate (2). A slanted keyway (4) is provided on the base (1). A slanted key (5) is movably provided in the slanted keyway (4). A positioning rib (6) is provided on the slanted key (5) to hold the slot of the rotor core lamination group. The slanted keyway (4), the slanted key (5) and the positioning rib (6) have the same inclination angle. A limiting post (7) for limiting the thickness of the rotor core lamination group is fixed on the base (1). A clamping device (8) is provided between the base (1) and the pressure plate (2). At least two slanted keys (5) are provided on the base (1). A compression spring (9) is provided in the slanted keyway (4), and the compression spring (9) presses against the slanted key (5).
2. The lamination and stacking fixture for a miniature skewed rotor core according to claim 1, characterized in that: Two oblique keys (5) are symmetrically arranged on the base (1), and the positioning rib (6) and the oblique keyway (4) are in a small clearance fit; the width L of the positioning rib is precisely calculated: L=(k-δ*sin(b))*cos(b) Where b = 90° - a is the angle of the skew groove of the lamination group; a is the tilt angle of the skew key; δ is the thickness of the lamination, in millimeters; and k is the width of the lamination groove, in millimeters.
3. The lamination and stacking fixture for a miniature skewed rotor core according to claim 1 or 2, characterized in that: The clamping device (8) includes a bolt (81) and a nut (82).
4. The lamination and stacking fixture for a miniature skewed rotor core according to claim 3, characterized in that: The bolt (81) is hinged to the base (1).