Light high-accuracy digital control system for miniature flywheel

Abstract

The invention discloses a light high-accuracy digital control system for a miniature flywheel. The system belongs to a kind of posture control execution mechanism applied to miniature satellites which are lighter than 100Kg, and mainly comprises a field programmable gate array (FPGA) module, a three-phase full-bridge driving device, an RS-232 communication circuit, a Buck converter, an analogue-to-digital (AD) sampling circuit and a signal conditioning circuit, a Hall signal filter and the like, wherein the FPGA module comprises an instruction parser, a moment-current converter, a single-neuron adaptive proportion integration differentiation (PID) controller, a pulse width modulator (PWM), a commutation logic signal generator and the like. By the invention, a nonlinear transformation online correction method is adopted; the digital control system for the miniature flywheel is formed by taking the FPGA module as a control core based on a single-neuron adaptive PID control algorithm; and the high-accuracy moment output of the posture control execution mechanism for the miniature satellite is realized by adopting a moment mode. The invention has the characteristics that: the algorithm is simple and easy to implement; the system is quick in response, low in power consumption, high in reliability, flexible in design and particularly suitable for the miniature satellite; the power density of the miniature flywheel is increased; the mass and volume of the miniature flywheel are decreased; and cost is decreased.

Description

technical field [0001] The invention relates to a light-duty high-precision micro-flywheel digital control system, which is used for high-precision control of micro-satellite active attitude control micro-flywheels, and is especially suitable for space applications with high requirements for volume weight, power consumption and torque accuracy . Background technique [0002] According to the quality of satellites, satellites below 1000kg are generally called small satellites. Modern small satellites have many incomparable advantages of large satellites, such as small size, light weight, low development and launch costs, short development cycle, and a large number can be arranged in space orbit for backup, providing greater redundancy. Small satellites also have the characteristics of high-tech content, high technology integration, and high functional density. They have become the most active, challenging and promising space technology field, and are also an important trend ...

AI Technical Summary

Problems solved by technology

However, in the engineering application of these two single-neuron adaptive PID algorithms, when the set neuron gain is small, the system responds slowly and the overshoot decreases; when the set neuron gain is large, the system response Fast, but the overshoot increases and the adjustment time becomes longer. Therefore, a large number of experiments are required to determine the optimal neuron gain before engineering application, and the adaptive function cannot be truly realized.

Images