离心机高精度转速控制系统的研制

为提高航空航天领域惯性装置标定方面的技术 ,针对高精度离心机控制系统中转速控制的要求 ,分析了直流调速系统中影响转速波动率和转速稳态精度的因素 ,并给出了相应的控制策略。在减小转速波动率方面重点分析了脉冲宽度调制 (PWM)占空比对转速波动的影响 ,指出如果根据转速给定实时控制整流输出电压 ,在低速时可减小转速波动率约 80 %。在转速稳态精度方面 ,提出了 T法和连续变周期M/T法相结合的方法 ,不但解决了实际控制系统中高精度光栅的漏脉冲现象 ,而且使得实际控制系统具有高精度的稳态转速。在此基础上进行了实际控制系统硬件和软件的设计 ,试验结果满足了加速度计性能测试中对离心机转速波动率和转速稳态精度的要求。实际系统已通过国家标准计量局的鉴定与验收 ,一年来的运行实验表明了理论分析的正确性和可行性。

Precise centrifuge control system

Precise centrifuge control system is needed to improve the calibration of devices used in the aeronautics and astronautics. Several factors are analyzed which affect the precision and fluctuation of the rotational speed of the permanent magnet DC servo motor. The speed fluctuations can be reduced if the PWM (pulse width modulation) can be controlled to about 0.85 at all speeds by adjusting the voltage applied to the motor, especially at low speeds. The T and M/T methods should be used together to get high precise speed measurements. The combination of these two methods can also prevent the raster from missing one or more pulses. The control system had been appraised by the National Standard Bureau and has been in use for more than one year with good performance.