Research On Motor Of Electromagnetically-Driven Ultra-Fast Tool Servos

Now, freeform optics component becomes an indispensability part of high-tech field. Because of the component frame's complexity, the machining of this becomes an important task of machining field also. Actually, there're three common methods of machining, they're computer numerical control rubbing & polishing technique, focus ion beam machining technique and computer numerical control single-point diamond turning technique. Because of the high produce efficiency, high machining precision, repeatability, adapting to batch produce and the cheap cost, the computer numerical control single-point diamond turning technique get abroad recognition. The fast tool servo (FTS) of this technique is a key of part, because it makes tool to-and-fro turning with high speed, high frequency and high accuracy. The fast tool servo is mainly based on four principles which include piezoelectric FTS, magnetostrictive FTS, lorentz force FTS, normal-stress electromagnetically-driven FTS. The first three methods are studied much home and abroad, but the last one has much better integrated performance, so it becomes a new direction of machining in recent years. The theory, mathematical model and simulation of the normal-stress electromagnetic- ally-driven FTS are analyzed in the article, and we hope it can guide the production of this fast tool servo and diamond precision lathe.The work we have done includes five parts:1. We analyze the existent four principle of fast tool servo, review and compare their advantages and disadvantages and actual technique index, and confirm normal-stress electromagnetically-driven FTS being our studying object.2. We concretely analyze the existent basic theory of normal-stress electromag- netically-driven FTS, stress analyzing the non-linearity and linearity of drive force and excitation current, and present the adoptive drive model ultimately.3. With the point of view of magnet circuit which includes static magnet circuit, harmonic magnet circuit and instantaneous magnet circuit of the drive model, we obtain idea model of drive force equation finally and the armature movement equation. Besides that, we also present three analysises of heat loss which includes eddy current loss, hysteresis loss and coil heat loss.4. Based on the front idea analysis, we analyze and machine this FTS and finish assembly. Moreover, we discuss the material which each part need and the problem which we met in the machining process.5. We build the simulation model of this FTS by simulation software ANSYS 10.0, analyze magnetic force distributing condition in static magnet circuit and armature drive force change with the armature location, and compare them with the idea condition. We also analyze armature heat loss with excitation current, its frequency and soft magnet material resistivity change.