Temperature sensor signal lead for motor

Abstract

The utility model provides a temperature sensor signal lead for a motor. The temperature sensor signal lead for the motor structurally comprises a core wire, a sheath and a metal shielding layer between the core wire and the sheath, and the metal shielding layer is filled in a flexible insulating rubber layer which is arranged between the sheath and the core wire and hermetically wraps the core wire. The signal lead is manufactured by the steps of manufacturing the middle wire part, dipping glue, thermally curing and remanufacturing the sheath. According to the technical scheme, the manufacturing quality of the temperature protection type motor can be greatly improved.

Description

Technical Field

[0001] The present patent application relates to the technical field of motor temperature protection, and in particular to a signal lead structure of a motor temperature sensor. Background Art

[0002] The motor needs to be equipped with a temperature sensor for high temperature protection. In order to overcome the interference of the alternating magnetic field generated during the operation of the motor on the sensor detection performance, a braided metal shielding layer is added between the signal transmission core wire and the sheath in the structure of the temperature sensor signal lead to isolate the interference signal and ensure the stability of the temperature sensor sensing signal transmission and the accuracy of temperature measurement.

[0003] In motor manufacturing, after the temperature sensor and its signal lead are embedded in the motor coil, they must be vacuum dipped together with the motor coil. During this process, the insulating resin paint can easily enter the sheath of the lead wire, causing the core wire to become hard, brittle, or even cracked, which can easily damage the temperature sensor or even the entire motor. Summary of the invention

[0004] The invention purpose of this patent application is to solve the technical problem that when the temperature sensor buried in the motor coil is subjected to the vacuum varnishing process during the motor manufacturing, the insulating varnish enters the lead wire and corrodes the core wire, causing the core wire body to become hard, brittle, and cracked, which in turn causes damage to the temperature sensor and even threatens the quality of the motor. A temperature sensor signal lead wire for the motor is provided.

[0005] The patent application provides a technical solution for the signal lead of the motor temperature sensor and its preparation method, and its main technical contents are:

[0006] A temperature sensor signal lead wire for a motor, the structure of which comprises a core wire, a sheath and a metal shielding layer between the core wire and the sheath;

[0007] The metal shielding layer is filled between the sheath and the core wire and is sealed and wrapped in the soft insulating rubber layer of the core wire.

[0008] In one preferred option of the above overall technical solution, the soft insulating adhesive layer is any one of a soft silicone rubber layer and a flexible epoxy resin adhesive.

[0009] The above-mentioned motor temperature sensor signal lead is manufactured by the following manufacturing method:

[0010] 1). Make the middle line

[0011] Weaving a metal shielding layer around the core wire to obtain a middle wire portion;

[0012] 2). Dipping

[0013] The middle wire part in Step 1) is payed off by a wire pay-off machine, passes through an impregnating bath containing soft insulating glue, and is impregnated with the glue;

[0014] 3). Heat curing;

[0015] 4). A sheath is made outside the wire body in Step 3) to obtain a finished product of the temperature sensor injection-molded lead wire.

[0016] Among them, the soft insulating glue is uniformly mixed by a soft silicone rubber or a flexible epoxy resin and a curing agent, and the weight ratio of the soft silicone rubber or the flexible epoxy resin to the curing agent is preferably 10:(2 - 3).

[0017] Among them, the linear pay-off speed of the wire pay-off machine is preferably 4 m / s.

[0018] Among them, the heat curing is a stepwise temperature curing method, first kept warm at 40 - 50 °C for no more than 5 minutes, and then heat cured at 90 - 100 °C.

[0019] The technical solution of the temperature sensor signal lead wire for motors disclosed in this patent application wraps a soft insulating glue layer inside the sheath and outside the core layer. The metal shielding layer not only serves as a shielding layer for isolating interference, but also disperses material stress in the soft insulating glue layer, effectively protecting the core wire and the soft insulating glue layer. Especially when vacuum impregnating with resin insulating paint together with the motor coil, it can effectively isolate the resin insulating paint from eroding the core wire and protect the core wire from being damaged, thus greatly improving the manufacturing quality of temperature protection type motors and ensuring the reliability of the motor quality. Brief Description of the Drawings

[0020] Figure 1 It is a schematic cross-sectional structure diagram of the temperature sensor signal lead wire for this motor. Detailed Description of the Invention

[0021] The following will elaborate in detail on the technical content of the temperature sensor signal lead wire for motors in this patent application and explain its technical effects.

[0022] As Figure 1 shown, the temperature sensor signal lead wire for this motor includes a core wire 1 wrapped by a Teflon sheath 3, a metal shielding layer 2 between the core wire 1 and the sheath 3. The sheath 3 is generally made of conventional Teflon material.

[0023] As Figure 1 shown, the metal shielding layer 2 is filled in the soft insulating glue layer 21 that is hermetically wrapped around the core wire 1 between the sheath 3 and the core wire 1.

[0024] The manufacturing method of the above-mentioned temperature sensor signal lead wire for motors is as follows:

[0025] Example 1

[0026] 1). Manufacture the intermediate wire part

[0027] Weave the metal shielding layer 2 around the core wire 1 to obtain the intermediate wire part with the metal shielding layer 2;

[0028] 2). Impregnate with glue

[0029] Let the intermediate wire part from step 1) be payed off by a pay-off machine, pass through the impregnation tank containing soft insulating glue, and be impregnated; the soft insulating glue is composed of software silicone rubber and a curing agent mixed thoroughly in a weight ratio of 10:1. The intermediate wire part passes through the impregnation tank linearly by the pay-off machine for impregnation, and the moving speed is selected as 3 m / s, and it is heated and cured at a stepped temperature by a subsequent staged tunnel oven; the software silicone rubber can also be replaced by flexible epoxy resin;

[0030] 3). Heat curing;

[0031] Implement the stepped temperature curing method, keep it warm at 40°C for 3 minutes, and then cure it by heat at 90 - 100°C;

[0032] 4). Manufacture a sheath outside the wire in step 3) to obtain the finished product of the temperature sensor injection lead.

[0033] Example 2

[0034] The difference from Example 1 is:

[0035] 2). The soft insulating glue is composed of software silicone rubber and a curing agent mixed evenly in a weight ratio of 10:1.5;

[0036] Example 3

[0037] The difference from Example 1 is:

[0038] 2). The soft insulating glue is composed of software silicone rubber and a curing agent mixed evenly in a weight ratio of 10:2.

[0039] Example 4

[0040] The difference from Example 3 is:

[0041] 2). The pay-off speed of the pay-off machine is 4 m / s;

[0042] Example 5

[0043] The difference from Example 1 is:

[0044] 2). The soft insulating glue is composed of software silicone rubber and a curing agent mixed evenly in a weight ratio of 10:3; the pay-off speed of the pay-off machine is 4 m / s.

[0045] After curing, the wire bodies were subjected to a simulated actual VPI vacuum impregnation process to detect the degree of erosion of the insulating paint on the wire bodies of each embodiment.

[0046] Cut 2 meters of the cured wire bodies of each embodiment and process them respectively according to the following steps:

[0047] Place them in a VPI container, evacuate the container to a negative pressure to make the vacuum degree reach -0.02 Mpa and maintain for 1 hour; open the valve of the insulating resin paint, inject the insulating resin paint into the container, and completely submerge the wire bodies, then maintain the pressure for 1 hour; then apply pressure to make the pressure in the container 5 Mpa and maintain the pressure for 5 hours. After the simulated VPI vacuum impregnation, send the wire bodies into an oven and dry them at 150°C for 2 h, then take them out, manually bend the wire bodies, observe the leads, and then peel off the Teflon sheath, and use an electron microscope to observe whether there is any phenomenon of the insulating resin paint infiltrating into the flexible insulating glue layer 21.

[0048] The results are as follows in the table:

[0049] Lead state Internal impregnation situation Conclusion Example 1 The wire body is extremely brittle and hard The shielding layer is filled with resin paint Unqualified Example 2 The wire body is extremely brittle and hard The shielding layer is filled with resin paint Unqualified Example 3 The wire body is extremely brittle and hard The shielding layer is filled with resin paint Unqualified Example 4 The wire body is slightly brittle and hard The shielding layer is filled with a small amount of resin paint Unqualified Example 5 The wire body is soft The shielding layer has no resin paint Qualified

Claims

1. A temperature sensor signal lead for a motor, the structure of which comprises a core wire (1), a sheath (3) and a metal shielding layer (2) between the core wire (1) and the sheath (3), characterized in that The metal shielding layer (2) is filled between the sheath (3) and the core wire (1) and is sealed and wrapped in the soft insulating rubber layer (21) of the core wire (1).

2. The motor temperature sensor signal lead according to claim 1, characterized in that: The soft insulating adhesive layer is any one of a soft silicone rubber layer and a flexible epoxy resin adhesive.

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