rotary drive

Abstract

The invention relates to a rotary driving device, which comprises a linear micro-displacement mechanism and an angular displacement conversion mechanism; the angular displacement conversion mechanism includes a moving plate, a push plate, a slide plate and a rolling body; the moving plate is connected to the linear micro-displacement mechanism , can move linearly along the X direction under the drive of the linear micro-displacement mechanism; the push plate is fixed on the moving plate; the sliding plate is installed on the moving plate, movably connected with the moving plate, and can move along the Y direction relative to the moving plate; The rolling body is clamped by the push plate and the slide plate, suspended on the moving plate, and the rolling body is movably connected with the rotating body. Since the technology of the linear micro-displacement mechanism is very mature, the precision can reach 0.1 μm or even higher, so the present invention adopts the method of converting the linear micro-displacement into the rotational angular displacement to drive the rotating body to rotate, and the angular positioning accuracy is high.

Description

technical field [0001] The invention relates to a rotary drive device. Background technique [0002] Rotating bodies such as turntables are usually driven by a shaft system to rotate. Generally, a servo motor, a reducer and a gear transmission (or worm drive) are used to jointly drive the shaft system to rotate and position, and some servo motors, reducers and friction wheels are used to drive the shaft system. rotationally positioned. The former not only has a complex structure and a large volume, but also has gaps in multi-stage deceleration and transmission, and low servo rigidity. Although the latter has a simple structure, it is also relatively large in size and has disadvantages such as easy wear and slipping. There are also torque motors that directly drive the shaft system to rotate and position. Obviously, the direct drive of the torque motor has the advantages of simple structure, small size, no gap and high servo rigidity, but only relying on the direct drive of ...

AI Technical Summary

Problems solved by technology

The former not only has a complex structure and a large volume, but also has gaps in the multi-stage deceleration and transmission, and the servo rigidity is low. Although the latter has a simple structure, it is also relatively large in size and has the disadvantages of easy wear and slipping.

There are also torque motors that directly drive the shaft system to rotate and position. Obviously, the direct drive of the torque motor has the advantages of simple structure, small size, no gap and high servo rigidity, but only relying on the direct drive of the torque motor. Higher angular positioning accuracy, it is difficult to realize the servo control of the turntable with large volume and mass

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