News of network of global electric machinery: Arc ⒁ 
Numerical control machine tool is in develop to the direction of nicety, high speed, compound, intelligence, environmental protection. Nicety and high speed machined pair of drive and its control to raise taller requirement, taller dynamic character and control precision, higher feed rate and acceleration, lower oscillatory noise and smaller wear awaying. The crucial point of the problem arrives from the electromotor that regards motivation as the source in traditional transmission catenary working component should pass gear, worm wheel deputy, leather belt, guide screw the intermediate transmission link such as deputy, shaft coupling, clutch, be in some of link is medium produced bigger moment of inertia, flexibility to be out of shape, lag of backlash, motion, attrition, oscillatory, noise and wear away. Although ceaseless improvement is passed to make transmission function rises somewhat in these respects, but the question is very difficult from go up at all solve, at appearing " straight drive " concept, cancel to arrive from electromotor namely all sorts of intermediate link between working component. As electric machinery and the development that its drive controls a technology, of the occurrence of electric main shaft, linear electric machinery, pitching moment electric machinery and technology increasingly mature, make main shaft, linear and rotate coordinate moves " straight drive " the concept turns into reality, show its huge advantage increasingly. Linear electric machinery and the application that its drive controls a technology to go up in drive of machine tool feed, make the transmission structure of the machine tool appeared major change, make machine tool function had new flight.
2, the main good point of drive of feed of linear electric machinery
Feed speed range is wide. But from 1 (1) M/s arrives 20m/min above, at present the speed speed of machining center already amounted to 208m/min, and <60m/min of speed of speed of traditional machine tool, it is 20 ～ 30m/min commonly.
Speed character is good. Speed deviation can be amounted to (1) 0.01% the following.
Acceleration is big. The biggest acceleration can amount to linear electric machinery 30g, at present the feed acceleration of machining center already amounted to 3.24g, the feed acceleration of machine of laser beam machining already amounted to 5g, and acceleration of feed of traditional machine tool is under 1g, it is 0.3g commonly.
Fixed position precision is tall. Use grating closed-loop control, fixed position precision can amount to 0.1 ～ 0.01 (1) M. System of drive of linear electric machinery can reduce pilot of the make a present of before application tracking error 200 times above. Because the trends of athletic component is characteristic good, answer delicacy, add interpolation pilot to be changed subtly, can realize control of accept rice class.
The journey is unlimited. Conventional guide screw drive accepts restriction of guide screw workmanship, general 4 ～ 6m, more the journey needs to receive filament thick line, no matter be returned from workmanship,be not ideal on function. And introduce drive of linear electric machinery, stator but infinite lengthen, and workmanship is simple, already axis of X of machining center of large high speed is as long as 40m above.
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