Semi-attraction float type magnetic suspension drive system for superfine machining

Abstract

A magnetic suspension driving system for superfinishing is composed of a constant-temp cavity controlled by cold-hot driver, guide track in said cavity, drive coils at both sides of guide track, suspending magnetic steel under it, drive unit on said guide track, the guide and drive magnetic steels relative to said drive coils. the permanent magnet, exciting coil and core of magnetic pole, which are relative to said suspending magnetic steel, force sensor and temp sensor. Its advantages are low static and dynamic friction forces, not losing all of sucking-floating force even if current is suddenly lost, high stability and high controllability.

Description

technical field [0001] The invention relates to a normally conducting and semi-absorbing floating magnetic levitation drive system for ultra-precision machining. Background technique [0002] There are many factors restricting ultra-precision machining, such as the influence of ambient temperature, the deformation of the guide rail, the beating of the rotary body, etc., and the dynamic and static friction coefficients of the guide rail are quite different, resulting in jumping feed and causing oscillation of the closed-loop control system , is also one of the key factors affecting the development of ultra-precision machining. At present, the conventional method to reduce the dynamic and static friction coefficient is to use static pressure guide rails. The disadvantage of this is that the device is complicated, and once the oil leaks, it will cause environmental pollution; another relatively new method is to add magnetic oil to the guide rails, and ...

AI Technical Summary

Problems solved by technology

At present, the conventional method to reduce the dynamic and static friction coefficient is to use static pressure guide rails. The disadvantage of this is that the device is complicated, and once the oil leaks, it will cause environmental pollution; another relatively new method is to add magnetic oil to the guide rails, and use mechanical instant start The friction energy quickly activates the positive ions on the metal surface, forms a positive ion protective layer on the two contact surfaces and repels each other with the same sex, so that the dynamic friction coefficient is reduced to a very low level, but this cannot solve the problem that the static friction coefficient is too large Problem, in the process of closed-loop control, the oscillation of the control system will also be caused by the difference of dynamic and static friction coefficients

In view of the large difference between the dynamic and static friction coefficients of the guide rails in the current ultra-precision machining, a constant conduction semi-suction floating magnetic levitation drive system for ultra-precision machining is proposed

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