Direct driving type accurate turn plate

Abstract

The invention discloses a direct driving type precise rotating table which comprises a working table (30) and a torque motor, wherein the torque motor comprises a motor shell (8), a main shaft (2), a stator (6) and a rotor (7), the motor shell (8) is fixedly connected with the stator (6) to form a static part, the main shaft (2) is fixedly connected with the rotor (7) to form a rotating part, and the working table (30) is directly and fixedly connected with the main shaft (2) of the torque motor. Furthermore, a circular arc crossing roller bearing (1) is arranged between the motor shell (8) and the main shaft (2) and comprises an inner ring (21), two outer rings (22) and a plurality of circular arc rollers (23) arranged among of the inner ring (21) and the outer rings (22), and the circular arc rollers (23) are sequentially crossed in an angle of 90 DEG. The invention has high radial and axial load capacity, good rigidity and high motion precision and stability, and can meet the integrated requirements of serving as a high-precision digital control rotating table.

Description

technical field [0001] The invention relates to a direct-drive precision turntable. Background technique [0002] In the prior art of CNC machining centers, the motor-driven working turntable is driven by a power source through a transmission mechanism. Among them, the power source adopts a servo motor, which is regarded as an independent unit; the intermediate transmission link adopts a gear transmission, a rack and pinion transmission or a worm gear transmission. The processing accuracy requirements for gears, racks or worm gears are usually relatively high, and due to the existence of intermediate transmission links, there are shortcomings such as moment of inertia, elastic deformation, backlash, motion lag, friction, vibration, noise and wear, etc. improved processing quality. [0003] In addition, the bearing of the traditional motor adopts the cross cylindrical roller bearing structure. The bearing has high bearing capacity and good vibration resistance, and is main...

AI Technical Summary

Problems solved by technology

Although the thermal deformation of this type of torque motor will not directly affect the position accuracy of the worktable, and the structure is relatively simple, there will be some problems in the CNC turntable used in the machining center: 1) Vibration and impact will occur during the milling process , especially when the disc milling cutter is larger, it makes the magnetic gap between the stator and rotor of the torque motor with strong magnetic force change, which will seriously affect the performance of the torque motor

2) Affect the performance of the encoder

3) Affect the stiffness of the torque motor

Images