电机控制模型中的建模误差，以及系统运行中的参数漂移，诸如电机的定、转子电阻随着温度发生变化，相当于对所研究的控制系统加入了扰动。

The modelling inaccuracy and parameter drift in motor control, such as the stator and rotor resistance shift with temperature, act as the disturbance in the control system.

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叙述锅炉温度、水位微机自动控制系统的原理及系统在管理维护方面的运行经验。

The principle of microcomputer-based temperature and level control system is given and its operational experience in management and maintenance is introduced.

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实际应用该控制系统后，锅筒水位、蒸汽温度和产量都得到良好控制，提高了运行效益。

In the application, the drum water level, steam 'temperature and flow are all fallen in well control, and the running benefit are improved.

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