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Application of linear motor in high speed machine tool
09-09-2015 10:25:37 Click：2728
With the development of direct drive technology, linear motor and the traditional "rotary servo motor ball screw" drive mode of the contrast caused by the industry's attention. Now some of the world's advanced processing center manufacturers began in the application of high speed machine tools.
Precision linear motor because of simple transmission mechanism reduces the delay interpolation problem, positioning accuracy, reproduce precision, absolute precision, through the position detection feedback control will be more "rotary servo motor and ball screw" high, and easy to implement. Linear motor positioning accuracy can reach 0.1 M. "rotary servo motor and ball screw" up to a maximum of 2 ~ 5 m, and the requirements of the CNC servo motor - no gap coupling - check the transmission part of the thrust bearing - cooling system for the high precision rolling guide nut seat - worktable closed-loop system as a whole to lightweight, the accuracy of optical gate. If you want to achieve higher stability, "rotary servo motor and ball screw" to take dual axis drive, linear motor is a high heat components, strong cooling measures should be taken, to achieve the same end, the linear motor to pay a greater price.
Speed linear motor with a considerable advantage, linear motor speed of 300m / min, acceleration reached 10g; ball screw speed of 120m / min, acceleration is 1.5g. From the comparison of the speed and acceleration, the linear motor has considerable advantages and the linear motor in the successful resolution of fever after the speed will further improve, and "rotary servo motor and ball screw" in speed is restricted is difficult to further increase more.
Life of linear motor for moving parts and fixed parts between a mounting clearance, no contact, not wear due to high-speed reciprocating motion of, long use of dynamic positioning accuracy of no change, suitable for occasions of high precision. Ball screws can not be in the high speed reciprocating motion to ensure accuracy, due to high speed friction, will lead to wear and tear of the lead screw nut, affecting the accuracy of movement requirements. The demand for high accuracy can not be met.
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