A secondary structure of a permanent magnet linear motor and its potting tooling and potting process

Abstract

The invention discloses a secondary structure of a permanent magnet linear motor, which includes a secondary body; the secondary body includes a magnetically conductive mounting plate and a permanent magnet; the magnetically conductive mounting plate is provided with several regularly arranged grooves, and each groove A permanent magnet is embedded in the center; the magnetically permeable mounting plate is provided with mounting parts distributed on both sides of the groove, the lower surface of the magnetically permeable mounting plate is provided with a mounting surface, and the lower surface of the magnetically permeable mounting plate is provided with several first threaded holes ; All outer surfaces of the secondary body except for the mounting surface are covered with a potting glue layer, so that the mounting surface forms a blank area for potting. The invention also discloses a potting tool and a potting process. The secondary structure of the permanent magnet linear motor of the present invention has good protection, and is suitable for the harsh working environment of the machine. The potting tooling of the present invention ensures a completely bubble-free potting effect through two means of "immersion" packing and piston feeding, and can greatly simplify the linear motor on the basis of greatly improving the secondary precision and appearance processing technology.

Description

technical field [0001] The invention relates to a secondary structure of a permanent magnet linear motor, in particular to a secondary structure of a permanent magnet linear motor and its potting tooling and potting process. Background technique [0002] Compared with the structure of servo motor plus ball screw, linear motor has more advantages in moving speed and positioning accuracy. At the same time, due to less mechanical contact, linear motor has high response and long-term stability. In addition, due to the reduction of components, the structure is simple and the maintenance is convenient. The length of the magnetic plate assembly can be increased to increase the stroke without sacrificing motor performance. The linear motor can be regarded as a rotary motor cut radially and unfolded into a straight line, the stator of the rotary motor becomes the primary of the linear motor, and the rotor of the rotary motor becomes the secondary of the linear motor. Rotary motors ...

AI Technical Summary

Problems solved by technology

5. It is difficult to make the colloid free of bubbles by using the general glue encapsulation process, and it is even impossible to form a complete film on the surface of the magnetic steel

[0007] 1. Insufficient protection:

[0008] One type of product directly exposes the secondary permanent magnet to the air without any protection. Since the machine produces debris during processing, if the debris is attracted by the permanent magnet, it will cause the motor to scratch when it is running. The situation is serious. It will cause the motor to be scratched or even scrapped

Another type of product only adds the treatment of laying sheet metal on the surface. The sheet metal can only protect solid impurities and cannot block the water vapor in the machine. If the permanent magnet is exposed to the water vapor environment of the machine for a long time, it may cause secondary zero Parts rust

[0009] At present, the most reliable means of protection is encapsulation with potting glue, but due to the reasons of potting technology, only a small number of manufacturers adopt this technology

Moreover, in the potting products circulating in the market, it is difficult to avoid a large number of pores in the colloid, which seriously affects the appearance and performance

External porosity exposes secondary components to air, internal porosity reduces gel strength

[0010] 2. The mold packaging process is immature:

[0012] There are obvious defects in the traditional potting process: 1. The larger the potting volume, the greater the shrinkage of the colloid, and the more prone to damage such as shrinkage cavities and cracks

The shrinkage cavity generated on the surface of the finished product not only affects the appearance of the product, but may also cause poor sealing of internal parts; second, the shrinkage cavity is difficult to find inside, and has little impact on performance, but the location of the internal shrinkage cavity is relatively random. The position of the hole in the thinner part of the colloid will bring the hidden danger of colloid falling off; 3. The increase of the margin not only causes waste of materials, but also increases the processing time

[0013] 3. The method of glue feeding is immature:

However, such solutions are still unable to meet the production needs

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