Die for encapsulating stator inner skewed slot motor winding

Abstract

The invention belongs to the technical field of motor product assembly, and discloses a mold for encapsulating a stator inner chute motor winding, which comprises a mandrel, a nut, an upper pressing plate, a butterfly nut, an upper male mold, an upper female mold, a lower female mold, a glue inlet, a glue runner, a hole plug, a screw rod, a lower base and a winding. According to the invention, the problem of incomplete encapsulation of the non-leading-out terminal of the winding caused by difficult flowing of a glue solution under a high slot filling rate is solved, and the one-time survival rate of encapsulation is improved.

Description

Technical Field

[0001] This invention belongs to the field of motor product assembly technology, specifically relating to a mold for potting stator internal skew slot motor windings. It is used to pot the motor windings as a whole, ensuring important assembly parameters such as shape and size during potting and molding, so as to enhance the winding's vibration resistance and improve its heat dissipation capacity, ultimately improving the product's reliability. Background Technology

[0002] High-voltage, high-power motors are increasingly widely used, placing increasingly stringent demands on the heat dissipation, insulation, and vibration resistance of various motor components. As the core component of the motor, the motor winding is the part that generates the most concentrated and fastest heat, and it is also the key component for improving the motor's insulation performance. Potting the motor windings encapsulates the enameled wire within the potting compound, reducing direct contact with the external environment. Simultaneously, the potting compound fills the gaps between the enameled wires, ensuring a seamless, continuous structure, thereby improving the winding's heat dissipation capacity, insulation resistance, and vibration resistance.

[0003] Due to the high performance, high reliability requirements, and size and weight constraints of aviation motors, stators feature an internally skewed slot structure, high winding slot fill factor, and stringent dimensional requirements. Therefore, during winding potting, it is crucial to strictly control key dimensions such as the inner and outer diameters and height of the potting compound to ensure that the winding end dimensions meet requirements after potting. Simultaneously, the potting surface must be smooth, flat, and free of air bubbles. Accurately controlling the amount of potting compound to ensure the shape and size of the potted compound, and improving potting efficiency to ensure that a single potting operation meets requirements while reducing reliance on operator skills, are key factors in improving product quality and ensuring the reliability of aviation equipment. Summary of the Invention

[0004] This invention addresses the problem of incomplete potting of non-leading ends of windings due to difficulties in glue flow under high slot fill factor. It provides a mold for potting stator internal skewed slot motor windings, which can ensure strict requirements on inner and outer diameters, height, and shape during potting, thus guaranteeing smooth production operations.

[0005] The technical solution of this invention is implemented as follows: A mold for potting stator internal skewed slot motor windings includes: a mandrel, a nut, an upper pressure plate, a wing nut, an upper male mold, an upper female mold, a lower female mold, a glue inlet, a glue channel, a plug, a screw, a lower base, and a winding. The lower female mold has a stepped inner hole, which, together with the bottom of the mandrel with the same stepped design, forms a semi-closed cavity, determining the inner and outer diameters and height of the non-lead-out end of the winding for potting. The upper female mold, together with the upper male mold, forms a semi-closed cavity, determining the inner and outer diameters and height of the lead-out end of the winding for potting. The nut, connected by a threaded connection at the end of the mandrel, fixes the upper male mold, ensuring no axial movement. Two screws connect the lower base and the upper pressure plate, and are fixed by wing nuts. The lower base contacts the lower female mold through a limiting groove, and the upper pressure plate contacts the upper female mold through a limiting screw. The upper and lower female molds are respectively fitted onto both ends of the winding, ultimately ensuring that the lower and upper female molds form a unified whole without axial displacement. The lower female mold has inclined through holes at both ends of its side, fitted with a flow channel and an inlet, facilitating the injection of potting compound from the bottom of the winding without overflowing. The flow channel is fitted with a plug to restrict the flow of compound during curing after potting.

[0006] As a further aspect of the present invention: the inner hole of the lower female mold is a stepped hole, the inner hole diameter at the smaller inner diameter is the outer diameter of the rubber material after the non-lead wire end of the winding is potted and molded, and the inner hole height at the smaller inner diameter is the height of the rubber material after the lead wire end of the winding is potted and molded. The inner hole of the upper female mold is a stepped hole. The inner diameter at the smaller inner diameter is the outer diameter of the rubber material after the winding lead wire end is potted and molded. The height of the inner hole at the smaller inner diameter is the height of the rubber material after the winding lead wire end is potted and molded.

[0007] As a further aspect of the present invention: the mandrel is a stepped shaft, the diameter at the larger outer diameter is the inner diameter of the rubber material after the winding is potted and molded, the length at the larger outer diameter is fitted and assembled with the lower base, and the length dimension after fitting and assembling is the height of the rubber material after the winding is potted and molded. The stepped hole at the bottom of the lower female mold is fitted with the mandrel to limit the position of the mandrel.

[0008] As a further aspect of the present invention: the mandrel and the upper male mold are made of fluoroplastic material.

[0009] As a further aspect of the present invention: the mandrel passes through the winding and the upper male mold, and the nut is connected to the mandrel by a thread and presses the upper male mold to ensure that the position of the upper male mold is fixed.

[0010] As a further embodiment of the present invention: two screws are symmetrically arranged, connected to the lower base and the upper pressure plate by threads, and fixed by wing nuts.

[0011] As a further aspect of the present invention: the lower female mold has inclined glue outlets on both sides, which facilitates glue injection from the bottom of the winding, ensures that the glue flows downward and restricts glue overflow.

[0012] As a further aspect of the present invention, the glue channel and glue inlet are made of transparent material to facilitate observation of the glue addition process.

[0013] As a further aspect of the present invention, the glue inlet has a wide inlet and narrow outlet structure, which has a certain glue storage function.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention improves the integrity of the glue filling under high tank fullness by bottom-up potting, thereby increasing the first-time potting success rate.

[0015] 2. This invention is easy and reliable to assemble, and can reduce the dependence on operator skills while ensuring operational quality, thus greatly improving operational efficiency.

[0016] 3. This invention defines the shape of the potting compound by forming a semi-enclosed cavity between the mandrel, lower female mold, upper male mold, and upper female mold, ensuring the inner and outer diameters and height dimensions of the winding potting end; the mandrel and upper male mold are made of fluoroplastic material, which does not stick to the potting compound, making them easy to remove and clean; the lower base and upper pressure plate are connected and fixed together by two screws and wing nuts, enabling quick disassembly and installation; inclined through holes are left at both ends of the lower female mold side, which are equipped with flow channels and inlets, facilitating the injection of potting compound from the bottom of the winding without overflowing, ensuring complete filling of the bottom of the high slot fill rate lower winding 1 with compound.

[0017] 4. By using this mold, the final shape and size of the winding after potting are guaranteed, the amount of potting glue is controlled, and waste is reduced; it solves the problem of incomplete potting of the non-leading ends of the winding due to the difficulty of glue flow under high slot fill rate, improves the success rate of potting on the first attempt, ensures the integrity of the potting surface, and ultimately improves production efficiency, as well as the heat dissipation performance and anti-insulation performance of the winding.

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structural assembly of the present invention.

[0020] Figure 2 This is an exploded view of the structure of the present invention.

[0021] Figure 3 This is a schematic diagram of the usage steps of the present invention.

[0022] The attached diagram is labeled as follows: 1-Mandrel, 2-, 3-Upper pressure plate, 4-Wing nut, 5-Upper male mold, 6-Upper female mold, 7-Lower female mold, 8-Glue inlet, 9-Glue channel, 10-Plug, 11-Screw, 12-Lower base, 13-Winding. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions in the embodiments of this invention will be described in more detail below with reference to the accompanying drawings.

[0024] In the accompanying drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, of the embodiments of the present invention.

[0025] The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0026] The following is in conjunction with the appendix Figure 1-3 The embodiments of the present invention will be described in detail below.

[0027] Example 1 This invention provides a mold for potting the stator internal skew slot motor winding. The potting mold includes a mandrel 1, a nut 2, an upper pressure plate 3, a wing nut 4, an upper male mold 5, an upper female mold 6, a lower female mold 7, a glue inlet 8, a glue channel 9, a plug 10, a screw 11, a lower base 12, and a winding 13. The lower female mold 7 has a stepped inner hole, which, together with the bottom of the mandrel 1 (which also has a stepped bottom), forms a semi-closed cavity, determining the inner and outer diameters and height of the non-lead-out end of the winding 13. The upper female mold 6, together with the upper male mold 5, forms a semi-closed cavity, determining the inner and outer diameters and height of the lead-out end of the winding 13. The nut 2, through a threaded connection at the end of the mandrel 1, fixes the upper male mold 5, ensuring no axial movement. Two screws 11 connect the lower base 12 and... The upper pressure plate 3 is fixed by a wing nut 4. The lower base 12 contacts the lower female mold 7 through a limiting groove. The upper pressure plate 3 contacts the upper female mold 7 through a screw 11, ultimately ensuring that the lower female mold 7 and the upper female mold 6 become a whole without axial displacement. The lower female mold 7 has inclined through holes at both ends of its side, which are fitted with a glue channel 9 and a glue inlet 8 to facilitate the injection of potting glue from the bottom of the winding 13 without overflowing. The glue channel 9 is fitted with a plug 10 to restrict the flow of glue during curing after potting.

[0028] Furthermore, the inner hole of the lower female mold 7 is a stepped hole, the inner hole diameter at the smaller inner diameter is the outer diameter of the rubber material after the non-lead wire end of the winding 13 is potted and molded, and the inner hole height at the smaller inner diameter is the height of the rubber material after the lead wire end of the winding 13 is potted and molded.

[0029] Furthermore, the inner hole of the upper female mold 6 is a stepped hole, the inner hole diameter at the smaller inner diameter is the outer diameter of the rubber material after the lead wire end of the winding 13 is potted and molded, and the inner hole height at the smaller inner diameter is the height of the rubber material after the lead wire end of the winding 13 is potted and molded.

[0030] Furthermore, the mandrel 1 is a stepped shaft, with the diameter at the larger outer diameter being the inner diameter of the resin after the winding 13 is potted and molded, and the length at the larger outer diameter being fitted and assembled with the lower base, the length dimension after fitting and assembling being the height of the resin after the winding 13 is potted and molded.

[0031] Furthermore, the bottom stepped hole of the lower female mold 7 is fitted with the mandrel 1 to limit the position of the mandrel 1.

[0032] Furthermore, the mandrel 1 and the upper male mold 5 are made of fluoroplastic material.

[0033] Furthermore, the nut 2 is connected to the mandrel 1 by threads and presses the upper male mold 5 to ensure that the position of the upper male mold 5 is fixed.

[0034] Furthermore, the two screws 11 are connected to the lower base 12 and the upper pressure plate 3 by thread, and are fixed by a quick-release method using a wing nut 4.

[0035] Furthermore, the lower female mold 7 has inclined glue outlets on both sides to facilitate glue injection from the bottom of the winding 13, ensuring the glue flows downward and limiting glue overflow.

[0036] Furthermore, the adhesive channel 9 and the adhesive inlet 8 are made of transparent material, allowing observation of the adhesive addition process.

[0037] Furthermore, the glue inlet 8 has a wide inlet and narrow outlet structure, which has a certain glue storage function.

[0038] The shape of the potting compound is defined by a semi-enclosed cavity formed between the mandrel 1, lower female mold 7, upper male mold 5, and upper female mold 6, ensuring the inner and outer diameters and height dimensions of the potting end of the winding 13. The mandrel 1 and upper male mold 5 are made of fluoroplastic material, which does not stick to the potting compound and is easy to remove and clean. The lower base 12 and upper pressure plate 3 are connected and fixed together by two screws 11 and wing nuts 4, which can achieve quick disassembly and installation. Inclined through holes are left at both ends of the side of the lower female mold 7, which are equipped with a flow channel 9 and a glue inlet 8 to facilitate the injection of potting compound from the bottom of the winding 13 without overflowing, ensuring that the bottom of the winding 13 is completely filled with potting compound under high slot fill rate conditions.

[0039] Example 2 See Figure 1This invention provides a mold for potting the stator internal inclined slot motor winding. The potting mold includes a mandrel 1, a nut 2, an upper pressure plate 3, a wing nut 4, an upper male mold 5, an upper female mold 6, a lower female mold 7, a glue inlet 8, a glue channel 9, a plug 10, a screw 11, and a lower base 12.

[0040] When potting the inner inclined slot motor winding 13, first install the lower female mold 7 into the limiting groove of the lower base 12, then install the large outer diameter end of the mandrel 1 into the limiting groove of the lower female mold 7 and press it to the bottom; install the winding 13 with the lead wire end facing upward into the mandrel 1, ensuring that the stator end face of the winding 13 contacts the inner hole step of the lower female mold 7; pass the lead wire of the winding 13 out through the upper female mold 6, then install the upper female mold 6 on the outside of the lead wire end of the winding 13 and gently press it to the bottom; install the upper male mold 5 on the mandrel 1 and fix it to the mandrel 1 by tightening the nut 2; screw the two screws 11 into the threads of the lower base 12. The end face of the screw 11's relief groove is flush with the lower base 12. Then, align the through holes at the ear rings of the upper pressure plate 3 with the two screws 11 and insert them until the upper pressure plate 3 presses against the upper female mold 6. Secure the upper pressure plate 3 by tightening the two wing nuts 4. Insert the two glue channels 9 into the inclined openings on the outer side of the lower female mold 7. Ensure correct assembly by observing the direction of the markings on the glue channels 9. Then, thread the glue inlet 8 onto the glue channel 9, ensuring the opening of the glue inlet 8 faces upwards. After completing the glue filling, remove the glue inlet 8 and gently screw the plug 10 into the glue channel 9 to prevent glue overflow. See the usage procedure for details. Figure 3 .

[0041] This invention relates to a mold for potting stator internal skewed slot motor windings. The shape of the potting compound is defined by a semi-enclosed cavity formed between the mandrel 1, lower female mold 7, upper male mold 5, and upper female mold 6, ensuring the inner and outer diameters and height of the potting end of the winding 13. The mandrel 1 and upper male mold 5 are made of fluoroplastic material, which does not adhere to the potting compound, facilitating removal and cleaning. The lower base 12 and upper pressure plate 3 are connected and fixed together by two screws 11 and wing nuts 4, enabling quick disassembly and installation. Inclined through holes are provided at both ends of the lower female mold 7, fitted with a flow channel 9 and an inlet 8, facilitating the injection of potting compound from the bottom of the winding without overflow, ensuring complete filling of the bottom of the winding 13 with high slot fill factor.

[0042] Using this mold ensures the final shape and size of the winding after potting, controls the amount of potting adhesive, and reduces waste; it solves the problem of incomplete potting of the non-leading ends of the winding due to the difficulty of adhesive flow under high slot fill factor, improves the success rate of potting on the first attempt, ensures the integrity of the potting surface, and ultimately improves production efficiency, as well as the heat dissipation performance and insulation resistance of the winding.

[0043] Thus, the objective of this invention has been achieved.

[0044] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A mold for potting stator internal skew slot motor windings, characterized in that, include: Mandrel, nut, upper pressure plate, wing nut, upper male mold, upper female mold, lower female mold, glue inlet, glue channel, plug, screw, lower base and winding; The lower female mold has a stepped inner hole, which, together with the bottom of the mandrel with the same stepped design, forms a semi-closed cavity, determining the inner and outer diameters and height of the non-lead-out end of the winding for potting. The upper female mold, together with the upper male mold, forms a semi-closed cavity, determining the inner and outer diameters and height of the lead-out end of the winding for potting. The nut, connected by a threaded connection at the end of the mandrel, fixes the upper male mold, ensuring no axial movement. Two screws connect the lower base and the upper pressure plate, and are fixed by wing nuts. The lower base contacts the lower female mold through a limiting groove, and the upper pressure plate contacts the upper female mold through a limiting screw. The upper and lower female molds are respectively fitted onto both ends of the winding, ultimately ensuring that the lower and upper female molds form a unified whole without axial displacement. The lower female mold has inclined through holes at both ends of its side, fitted with a flow channel and an inlet, facilitating the injection of potting compound from the bottom of the winding without overflowing. The flow channel is fitted with a plug to restrict the flow of compound during curing after potting.

2. The mold for potting stator internal skew slot motor windings according to claim 1, characterized in that, The inner hole of the lower female mold is a stepped hole. The inner hole diameter at the smaller inner diameter is the outer diameter of the rubber material after the non-lead wire end of the winding is potted and molded. The inner hole height at the smaller inner diameter is the height of the rubber material after the lead wire end of the winding is potted and molded. The inner hole of the upper female mold is a stepped hole. The inner diameter at the smaller inner diameter is the outer diameter of the rubber material after the winding lead wire end is potted and molded. The height of the inner hole at the smaller inner diameter is the height of the rubber material after the winding lead wire end is potted and molded.

3. The mold for potting stator internal skew slot motor windings according to claim 1, characterized in that, The mandrel is a stepped shaft. The diameter at the larger outer diameter is the inner diameter of the rubber material after the winding is potted and molded. The length at the larger outer diameter is fitted and assembled with the lower base. The length dimension after the fitting and assembly is the height of the rubber material after the winding is potted and molded. The stepped hole at the bottom of the lower female mold is fitted with the mandrel to limit the position of the mandrel.

4. The mold for potting stator internal skew slot motor windings according to claim 1, characterized in that, The mandrel and upper male mold are made of fluoroplastic material.

5. The mold for potting stator internal skew slot motor windings according to claim 1, characterized in that, The mandrel passes through the winding and the upper male mold. The nut is connected to the mandrel by a thread and presses the upper male mold to ensure that the position of the upper male mold is fixed.

6. The mold for potting stator internal skewed slot motor windings according to claim 1, characterized in that, Two screws are symmetrically arranged, connecting the lower base and the upper pressure plate by threads, and are fixed by wing nuts.

7. The mold for potting stator internal skew slot motor windings according to claim 1, characterized in that, The lower female mold has inclined glue outlets on both sides to facilitate glue injection from the bottom of the winding, ensuring that the glue flows downward and limiting glue overflow.

8. The mold for potting stator internal skew slot motor windings according to claim 1, characterized in that, The glue channel and glue inlet are made of transparent material, making it easy to observe the glue addition process.

9. The mold for potting stator internal skew slot motor windings according to claim 1, characterized in that, The glue inlet has a wide inlet and narrow outlet structure, which has a certain glue storage function.

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