Plastic package motor stator insulation insertion sheet

Abstract

The utility model discloses a plastic package motor stator insulation insert, which comprises a stator core, an insulation frame and an insulation insert, the insulation frame is sleeved at the outer end of the stator core and forms a plurality of wire embedding grooves in a surrounding manner, and the inner end face of each wire embedding groove is provided with a notch; the insulating insertion piece comprises a connecting strip and a plurality of protective teeth arranged at the lower end of the connecting strip at intervals, the protective teeth are correspondingly inserted into the wire embedding grooves and shield the notches, the end faces, facing the notches, of the protective teeth are sunken inwards to form grooves, the protective teeth are in a conical shape with the wide upper portion and the narrow lower portion, and the protective teeth are arranged in the grooves. The distance between every two protection teeth is the same as the distance between every two wire embedding grooves. According to the utility model, the insulating insertion sheet is added at the notch of the wire embedding groove, so that the winding coil can be prevented from being punched out of the notch by a plastic package material to be contacted with the stator iron core during plastic package, the rejection rate of pressure-resistant defective products is reduced, the mode can replace manual winding of adhesive tape for fixation, and the overall production efficiency can be improved while manpower is saved.

Description

Technical Field

[0001] The utility model belongs to the technical field of plastic-encapsulated motors, and particularly relates to an insulating insert for a stator of a plastic-encapsulated motor. Background Art

[0002] A plastic-encapsulated motor uses plastic encapsulation technology to integrally encapsulate the stator core, winding, etc. of the motor with engineering plastics, and can cancel the traditional insulating treatment process for the stator of the motor and the metal casing of a common motor.

[0003] In the production of the stator of an existing plastic-encapsulated motor, after the stator winding, two semi-circular stators are spliced, the main and auxiliary phase enameled wires are connected, and the enameled wire joints are pasted on the outer circumference of the stator with tape to prevent the enameled wire near the slot opening from being scattered by the impact force of the bulk molding compound during the injection molding process. Due to differences in the wiring operation methods of employees, the thickness of the enameled wire, the slot fill factor, etc. during the wiring process, a certain proportion of wire loosening will occur. The wire loosening is not easy to detect, and when repairing, it is necessary to manually wind the tape around the wire package with loose wires. The production efficiency is low while the defective rate has been high and difficult to control, affecting the production capacity.

[0004] In view of this, an insulating insert for a stator of a plastic-encapsulated motor is proposed. Content of the Utility Model

[0005] The purpose of the utility model is to provide an insulating insert for a stator of a plastic-encapsulated motor in order to solve the above-mentioned problems.

[0006] The technical solution adopted by the utility model is as follows: An insulating insert for a stator of a plastic-encapsulated motor includes a stator core, an insulating frame, and insulating inserts. The insulating frame is sleeved on the outer end of the stator core and encloses to form a plurality of embedding slots, and the inner end surface of the embedding slot has a slot opening; the insulating insert includes a connecting strip and a plurality of protecting teeth spaced at the lower end of the connecting strip, the protecting teeth are correspondingly inserted into the embedding slots and block the slot opening, and the end surface of the protecting tooth facing the slot opening is recessed inward to form a groove.

[0007] In a preferred embodiment, the protecting teeth are in a tapered shape with a wider upper part and a narrower lower part, and the distance between two adjacent protecting teeth is the same as the distance between two adjacent embedding slots.

[0008] In a preferred embodiment, the connecting strip is integrally arc-shaped, and when the protecting teeth are inserted into the embedding slots, the bottom end surface of the connecting strip abuts against the upper end surface of the insulating frame.

[0009] In a preferred embodiment, the plurality of protecting teeth and the connecting strip are integrally formed.

[0010] In a preferred embodiment, both ends of the bottom of the protecting tooth are provided with rounded corners.

[0011] In a preferred embodiment, a depression is formed at the connection between the tooth guard and the connecting strip, which is communicated with the groove and deeper than the groove to form a diversion groove, and an inclined diversion surface is provided between the diversion groove and the groove.

[0012] In a preferred embodiment, the insulating inserts are all made of nylon material.

[0013] In a preferred embodiment, there are a plurality of insulating inserts which are distributed along the circumferential direction of the stator core.

[0014] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present utility model are as follows:

[0015] 1. In the present utility model, insulating inserts are added at the slot opening, which can prevent the winding coil from being flushed out of the slot opening by the encapsulating material and contacting the stator core during encapsulation, reducing the rejection rate of non-compliant withstand voltage products. The above method can replace the manual winding of tape for fixation, saving manpower and improving the overall production efficiency at the same time;

[0016] 2. In the present utility model, a groove and a diversion groove are designed at one end of the tooth guard facing the slot opening. During injection molding, the encapsulating material can more easily slide into the slot opening, avoiding the phenomenon of incomplete injection molding of the encapsulating material, improving the bonding force between the insulating insert and the stator core after injection molding, and ensuring the overall structural strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a three-dimensional structural schematic diagram of the overall combination of the present utility model;

[0018] Figure 2 is a three-dimensional structural schematic diagram of the insulating insert in the present utility model;

[0019] Figure 3 is a three-dimensional structural schematic diagram of the insulating insert viewed from the back in the present utility model;

[0020] Figure 4 is a three-dimensional structural schematic diagram of the combination of the stator core and the insulating frame in the present utility model.

[0021] Reference numerals in the drawings: 1 - insulating frame, 2 - stator core, 3 - insulating insert, 301 - connecting strip, 302 - tooth guard, 303 - diversion groove, 304 - groove, 305 - fillet, 4 - wire embedding groove, 401 - slot opening. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] In order to make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0023] Reference Figures 1-4 A plastic-sealed motor stator insulating insert piece, comprising a stator core 2, an insulating frame 1 and insulating insert pieces 3. The insulating frame 1 is sleeved on the outer end of the stator core 2 and encloses to form a plurality of slot grooves 4. The inner end surface of the slot groove 4 has a notch 401; the insulating insert piece 3 includes a connecting strip 301 and a plurality of protection teeth 302 spaced at the lower end of the connecting strip 301. The protection teeth 302 are correspondingly inserted into the slot grooves 4 and block the notch 401. Adding the insulating insert piece 3 at the notch 401 can prevent the winding coil (not shown in the figure) from being flushed out of the notch 401 by the plastic-sealing material and contacting the stator core 2 during plastic-sealing, reducing the rejection rate of non-conforming voltage withstand products. The above method can replace manual winding of tape for fixation (can be inserted through a special insertion device), saving manpower and improving the overall production efficiency at the same time.

[0024] Furthermore, there are a plurality of insulating insert pieces 3 and they are circumferentially distributed along the stator core 2.

[0025] Furthermore, the end surface of the protection tooth 302 facing the notch 401 is recessed inward to form a groove 304. Through the designed groove 304, it can avoid the phenomenon that the plastic-sealing material is too thin at the notch 401, resulting in the shedding of the plastic-sealing material or the incomplete injection of the plastic-sealing material, and can ensure the overall structural strength after injection molding.

[0026] Furthermore, the protection tooth 302 is a cone with a wider upper part and a narrower lower part. The distance between two adjacent protection teeth 302 is the same as the distance between two adjacent slot grooves 4. Due to the shape of the protection tooth 302, it is convenient to insert the protection tooth 302 into the slot groove 4.

[0027] Among them, the protection tooth 302 is preferably two or four, but the specific number is not limited here.

[0028] Furthermore, the connecting strip 301 is integrally arc-shaped. When the protection tooth 302 is inserted into the slot groove 4, the bottom end surface of the connecting strip 301 abuts against the upper end surface of the insulating frame 1. Through the connecting strip 301, the protection teeth 302 can be combined into a whole, and can also assist in limiting the position of the protection tooth 302 inserted into the slot groove 4.

[0029] Furthermore, the plurality of protection teeth 302 and the connecting strip 301 are integrally formed parts. Since they are integrally formed, the overall structural stability of the insulating insert piece 3 is better, and the processing and manufacturing of the insulating insert piece 3 are relatively simple.

[0030] Furthermore, both ends of the bottom of the protection tooth 302 are provided with rounded corners 305. Through the designed rounded corners 305, it can avoid scratching the enameled wire and can also play a guiding role for the installation of the protection tooth 302.

[0031] Furthermore, at the connection between the tooth guard 302 and the connecting bar 301, a depression is formed inward to form a diversion groove 303 that communicates with the groove 304 and is deeper than the groove 304. An inclined diversion surface is provided between the diversion groove 303 and the groove 304. The designed diversion groove 303 can make it easier for the encapsulating material to slide into the notch 401 during injection molding, avoiding the phenomenon of incomplete injection molding.

[0032] Furthermore, the insulating insert 3 is made of nylon material. The nylon material has a certain elasticity and hardness, which can meet the auxiliary positioning operation for the enameled wire. Moreover, the nylon material itself has characteristics such as insulation and high heat resistance, and can also play an auxiliary insulation role.

[0033] Among them, the insulating insert 3 can also be made of other materials with a certain elasticity and hardness, which is not limited here.

[0034] In summary, adding the insulating insert 3 at the notch 401 of the stator core 2 can prevent the winding coil from being flushed out of the notch 401 by the encapsulating material and contacting the stator core 2 during encapsulation, reducing the rejection rate of non-conforming products with poor withstand voltage. At the same time, the insulating insert 3 can be inserted through a special insertion device, saving manpower and improving the overall production efficiency.

[0035] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A plastic-encapsulated motor stator insulation insert, characterized in that: It includes a stator core, an insulating frame and an insulating plug. The insulating frame is sleeved on the outer end of the stator core and encloses a plurality of wire embedding grooves. The inner end surface of the wire embedding groove has a notch. The insulating plug includes a connecting strip and a plurality of guard teeth spaced at the lower end of the connecting strip. The guard teeth are correspondingly inserted into the wire embedding grooves and cover the notch. The end surface of the guard teeth facing the notch is concave inward to form a groove.

2. The plastic-encapsulated motor stator insulating insert according to claim 1, characterized in that: The tooth guards are tapered and are wide at the top and narrow at the bottom. The spacing between the tooth guards is the same as the spacing between the wire embedding grooves.

3. The plastic-encapsulated motor stator insulating insert according to claim 1, characterized in that: The connecting strip is arc-shaped as a whole, and when the tooth guard is inserted into the wire embedding groove, the bottom end surface of the connecting strip abuts against the upper end surface of the insulating frame.

4. The plastic-encapsulated motor stator insulating insert according to claim 1, characterized in that: A plurality of the tooth guards and the connecting strip are integrally formed.

5. The plastic-encapsulated motor stator insulating insert according to claim 1, characterized in that: Both ends of the bottom of the mouthguard are provided with rounded corners.

6. The plastic-encapsulated motor stator insulating insert according to claim 1, characterized in that: The connection between the tooth guard and the connecting strip is inwardly recessed to form a guide groove which is connected to the groove and deeper than the groove, and an inclined guide surface is provided between the guide groove and the groove.

7. The plastic-encapsulated motor stator insulating insert according to claim 1, characterized in that: The insulating inserts are all made of nylon material.

8. The plastic-encapsulated motor stator insulating insert according to claim 1, characterized in that: The insulating inserts are in plurality and distributed along the circumference of the stator core.

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