Automatic control systems
The more sensitive the system reacts to the deviation of the controlled value from the set value, the more accurately the controlled value will be maintained. This means, for example, that the more sensitive the system will react to speed deviations, the less the drive speed will decrease with increasing load until the moment of cutoff, and the more sensitive the system will be to current deviation, the sharper the drive speed will decrease at a torque greater than the torque cutoffs.
Automatic control systems
In other words, the more sensitive the system reacts to the deviation of the controlled values from the set values, the higher the quality of the static and dynamic characteristics of the system, the more opportunities in the formation of optimal characteristics. Automatic control systems in which the value of the controlled variable changes with a change in the disturbing effect (load) are called static.
Systems in which the value of the controlled variable does not depend on the load are called astatic. The sensitivity of the system is determined primarily by the value of the overall gain.
The gain to any of the links and the entire control system (or part of it) is the ratio of the output value to the input value.If we take opposite values for the output and input values, then their ratio is called not the gain, but the transfer ratio. This coefficient has a certain dimension.
For example, if for a DC generator we take about as the output value. etc. with. generator Eg, and for the input — n. with. field winding FK, then their ratio will be the transfer ratio of the generator and will have dimensions. The sensitivity of the system’s response to the deviation of the controlled value from the set value depends on how much the signal arriving at the input of the system changes as a result of a change in the output value, or otherwise, how much the feedback signal changes when the output value changes. The ratio of the output value of the feedback to its input value (which is at the same time the output value of an individual link or the entire system) is called the feedback coefficient. So, for example, the generator voltage feedback coefficient is called the ratio
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