Large precise magnetic levitation rotating workbench

Abstract

A large precise magnetic levitation direct-drive rotating workbench comprises a driving motor of a rotating workbench body, an angular displacement feedback system, a radial active type bias magneticlevitation bearing, an axial active type bias magnetic levitation bearing, an axial protecting bearing and a radial protecting bearing; the rotating workbench body and the active type bias magnetic levitation bearings restraining the axial movement and the radial movement of the rotating workbench body are arranged, and the protecting bearings, braking devices and a position feedback system are arranged; and a signal of the position feedback system is output to a control system to control the driving motor an the braking devices. The large precise magnetic levitation direct-drive rotating workbench is characterized in that the rotating workbench body achieves magnetic levitation supporting through the active type bias magnetic levitation bearings, and the rotating workbench body is directly driven through a permanent magnetic synchronous torque motor. According to the large precise magnetic levitation direct-drive rotating workbench, friction of mechanical bearings is eliminated, machining and assembling are easy, and the transporting and maintaining cost is low. The revolution precision is high, the bearing capacity is high, power consumption is low, no crawling is caused during ultra-low-speed operation, and the large precise magnetic levitation direct-drive rotating workbench can be widely applied to the fields of astronomical observation instruments, numerical control machine tools, radars, precise rotating tables and the like.

Description

Technical field [0001] The invention relates to a magnetic levitation direct drive rotating device, in particular to a large precision magnetic levitation direct drive rotating worktable, which can be used for the azimuth axis of an astronomical telescope, a precision measurement and control simulation turntable, and the like. Background technique [0002] Large-scale astronomical telescope tracking frame, spacecraft simulation test platform, precision machine tool turntable, etc. (hereinafter collectively referred to as rotating table) are all high-precision equipment that requires small frictional torque, high transmission mechanism rigidity, fast dynamic response, and high rotation accuracy . At present, the rotary table is generally supported by hydrostatic bearings and mechanical bearings. Because the structural design of hydrostatic bearings is very complicated, the processing and manufacturing accuracy requirements are very high. For large rotating tables, such as the azim...

AI Technical Summary

Problems solved by technology

At present, the rotary table is generally supported by hydrostatic bearings and mechanical bearings. Because the structural design of hydrostatic bearings is very complicated, the manufacturing precision is very high. For large rotary tables, such as the azimuth axis of a 30-meter astronomical telescope The required hydrostatic bearings can reach a diameter of 50 meters, which is undoubtedly an extremely serious challenge

In addition, the performance of hydraulic oil is greatly affected by temperature, and the oil temperature and ambient temperature must be strictly controlled, and a reliable oil supply system and an independent backup power supply system are required, which occupy a large space, high maintenance costs, and complex control systems. For ultra-low speed precision tracking The problem is more obvious for large astronomical instruments

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