An electric spindle design adopting air static pressure anti-thrusting and air static pressure radial bearing support

Abstract

The invention relates to an electric spindle design adopting an aerostatic pressure anti-thrust and an aerostatic pressure radial bearing support. According to the outline dimension limit and the stiffness requirement of the electric spindle, the front end inside a shell (5) of the electric spindle is centrally provided with two aerostatic pressure anti-thrust bearings (1), thus leading the space utilization to be optimized and the structure to be compact, and at the same time the two aerostatic pressure anti-thrust bearings lead a supply air line convenient to centralize and install and provides the needed radial stiffness for a rotor-rotating shaft integrated shaft system (3). The two sides of a stator (4) are symmetrically provided with an aerostatic pressure radial bearing (2) so as to support the rotor-rotating shaft integrated shaft system, reduce the vibration of the shaft system (3) and ensure the radial stiffness. The rotor-rotating shaft integrated shaft system makes the squirrel-cage bar of the rotor of the electric motor and the rotating shaft into the integrated structure and the corresponding position of the stator arranged in the middle section and the shell of the electric spindle, that is the position of the squirrel-cage bar, adopts copper alloys directly welded in a groove of the integrated shaft system so as to reduce the creep deformation of the squirrel-cage bar, reduce the vibration value of the integrated shaft system and improve the power rate and the structural strength.

Description

technical field [0001] The invention belongs to the technical field of machinery, and in particular relates to a design of an electric main shaft adopting gas static pressure thrust and gas static pressure radial bearing support. Background technique [0002] In the PCB plate drilling processing industry, because the drilling diameter is getting smaller and smaller, the production efficiency requirements are getting higher and higher. Therefore, in order to meet this need, the speed requirements of the electric spindle for PCB drilling are also getting higher and higher, and Ordinary PCB electric spindle structure is no longer suitable for ultra-high speed, especially the support of the electric spindle shaft system no longer matches the ultra-high-speed motor system, because: [0003] 1. Because the DmN value of the bearing is too high, and the industry requires that the electric spindle cannot be lubricated by oil mist or oil and air, the traditional rolling element bearin...

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Problems solved by technology

[0002] In the PCB plate drilling processing industry, because the drilling diameter is getting smaller and smaller, the production efficiency requirements are getting higher and higher. Therefore, in order to meet this need, the speed requirements of the electric spindle for PCB drilling are also getting higher and higher, and Ordinary PCB electric spindle structure is no longer suitable for ultra-high speed, especially the support of the electric spindle shaft system no longer matches the ultra-high-speed motor system, because:

[0003] 1. Because the DmN value of the bearing is too high, and the industry requires that the electric spindle cannot be lubricated by oil mist or oil and air, the traditional rolling element bearing cannot be applied;

[0004] 2. The rotor of the traditional electric spindle motor adopts the structure of cast aluminum with magnetic steel sheet. Because the linear speed of the rotor surface is too high, and the structural strength and conductivity of the aluminum alloy strip are low, it is easy to cause the rotor to creep under the ultra-high speed state, causing the electric spindle The vibration of the shaft system is too large, which affects the processing quality of the spindle

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