Servo control system for quick response magnetic suspension control torque gyroscope frame

Abstract

A magnetic levitation control torque gyro framework servo control system for rapid response includes a magnetic levitation control moment gyro framework, a framework servo torque motor, an angular position sensor, a DSP digital control device that includes a current sensor, interface circuits for current and angle position sensor, a frame servo control system controller and a nonlinear differential tracker. The tracker calculates the angular rate of the servo system, and gets the difference with the granted rate to send into the controller, to enhance the accuracy of the rate of the system. The invention introduces the non-linear differential tracker, to realize the point-to-point differential track on the angular position of servo system, avoid the random noise that is fused during the process of getting the angular signal from the differential, improve the accuracy of angular rate, accelerate the response speed, and save the use of the system.

Description

technical field [0001] The invention relates to a fast-response magnetic levitation control torque gyro frame servo control system, which is used for fast-response and high-precision control of the magnetic levitation control moment gyro frame servo system, and is especially suitable for the control execution of precision spacecraft that requires fast response speed and high precision mechanism. Background technique [0002] Control Moment Gyroscope (CMG) is a key actuator necessary for attitude control of large spacecraft such as space station. CMG consists of a high-speed rotor system and a frame servo system. The high-speed rotor support is a key component of the CMG. There are usually two types of mechanical ball bearing support and magnetic bearing support. The corresponding CMG is called mechanical CMG and magnetic levitation CMG. Compared with the traditional mechanical control torque gyroscope, the magnetic levitation control torque gyroscope has the advantages of l...

AI Technical Summary

Problems solved by technology

The existing frame servo control system is divided into two control modes: three-loop control and two-loop control. The three-loop control mode is current loop, speed loop and position loop. The position loop is designed to ensure the speed output accuracy of the frame servo system. However, the design of the position loop also reduces the response speed of the entire system and reduces the bandwidth of the servo system; the two-loop control method does not affect the bandwidth characteristics of the system, but the output accuracy of the existing angular rate sensor is far lower than that of the angular position sensor. Output accuracy, the accuracy of the sensor seriously reduces the control of the angular rate accuracy of the control system. Another way to obtain the angular rate signal is through the difference of the angular position sensor signal, but the differential signal depends on the sampling time, and the reduction of the sampling time leads to Random noise-like signal mixed with large amplitude and high frequency

Therefore, the current two methods cannot meet the requirements of the magnetic levitation control torque gyro frame servo control system with fast response speed and high precision.

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