JPH0124022B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lead wire extraction section of a resin mold motor, and aims to provide a resin mold motor with improved water resistance by preventing insulation deterioration due to water absorption from the lead wires. It is something.

Generally, a small molded stator mechanism made of resin is called a resin mold motor. In other words, it is a general term for motors in which a coil is attached to an iron core to form a stator, and this stator is embedded in resin to provide environmental resistance, and the resin has housing functions such as bearing function and flange function. It is called a resin mold motor.

There are several possible purposes for adopting this type of resin mold motor. One is to make the resin function as an electrical insulating material and a structural material at the same time in order to pursue economic efficiency during manufacturing.The other is to improve environmental deterioration resistance such as corrosion resistance, moisture resistance, and chemical resistance. This is because we hope to improve various performance such as improving the vibration absorption properties of resin and applying it to low-noise motors. Alternatively, the purpose may be to improve safety such as double insulation and non-ignition properties, or to improve reliability in terms of insulation life.

First, the general structure of a resin mold motor.
As shown in the figure. In FIG. 1, a coil 2 attached to an iron core 1 is embedded in a resin mold part 3 constituting a stator housing, and is integrally rigidized with the iron core 1 to form a stator. At this time, the stator has a function necessary for housing the rotor 4 and maintaining the rotation function. That is, a stator housing is formed by holding a bearing support part (hereinafter referred to as a bracket) 7, which accommodates a bearing 6 that supports a shaft 5 that is integrally fixed to the rotor 4, with a resin mold part 3. Further, a motor mounting mechanism (hereinafter referred to as a flange) 8 is also constructed from the resin molded portion 3 and is formed as a stator housing. 9 is a lead wire connected to the coil 2. The bracket 7 or flange 8 is made of aluminum,
It may be constructed using iron or other inserts, or it may be formed integrally with the resin mold part 3.

In the above structure, the lead wire portion is, as shown in FIG.
was used.

The above-mentioned resin motor is originally surrounded by resin and should exhibit sufficient water resistance characteristics, and in fact, except for water absorption from the lead wire portion, it was completely reliable. However, lead wires made by bundling several stranded wires are not sufficient to prevent moisture or water from entering between the single wires, and in particular, dew drops may sometimes occur on the lead wires and are located above. When the resin mold is in use, the water droplets that are generated inevitably penetrate into the resin mold, causing a decrease in electrical insulation.

The present invention provides a resin mold motor that eliminates the electrical insulation deterioration in the lead wire portion. In other words, a tube containing enough hot melt resin to completely fill the gap between the single wires is used, and the lead wire is made completely airtight during the resin molding process at the same time as the resin molding process, depending on the mold temperature during resin molding. In order to simplify the process, there is provided a resin mold motor having a lead wire with excellent water resistance and using a heat shrink tube as the tube.

An embodiment of the present invention will be described below with reference to FIG. In the figure, 9a is a single wire, which is made of a heat-resistant vinyl wire, a silicone glass insulated wire, or the like. 9b is a heat-resistant tube, including a silicone resin-impregnated glass tube, a silicone resin tube,
It is composed of saturated polyester resin tubes, etc. 9c is a hot melt resin, and after pressure melting,
As shown in the figure, it fills in between the single wires. This hot melt resin 9c needs to have sufficient heat resistance, adhesiveness, and elasticity, and is preferably one that melts at a temperature close to 140 to 170°C, which is the temperature during resin molding.

Further, if a heat-shrinkable tube is used as the tube 9b, the airtightness between the single wires can be further improved, and the workability of the resin molding process can be further improved.

As described above, according to the present invention, a resin molded motor with excellent water resistance can be provided by covering a lead wire with a tube having hot melt resin inside, and furthermore, the tube has heat shrinkability. By constructing the product from a single material, its reliability increases, and at the same time, the efficiency of the manufacturing process increases, increasing productivity.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a resin mold motor, FIG. 2 is a sectional view of a lead wire pull-out portion in a conventional resin mold motor, and FIG. 3 is a sectional view of an embodiment of the present invention. 3...Resin mold part, 9...Lead wire, 9
a...Single wire, 9b...Tube, 9c...Hot melt resin.

Claims (1)

[Claims] 1. In a resin mold motor in which lead wires made by bundling a plurality of single wires and covering them with a tube are pulled out from a resin mold part, the plurality of single wires are coated with a sufficient amount of hot melt resin to fill the gaps between the single wires. 1. A resin mold motor, characterized in that the resin mold motor is covered with a tube having a heat-shrinkable tube.