Parameter recognition system and method for DC electric motor speed control object

Abstract

The invention discloses a system and a method for identifying the speed controlled object parameters of a direct current motor, and belongs to the field of the direct current motor control. The identification system comprises a step signal generator, a power driving unit, the direct current motor and a load, speed detection sensor as well as a recording instrument. The identification method comprises the following steps: the power driving unit is adopted to receive a step signal output by the step signal generator and outputs drive current to drive the motor to drive the load to run; the speed sensor detects a speed signal and establishes a coordinate of the speed signal and the time; a step input signal amplitude is divided by an amplitude in a stable state with the speed signal, so as to obtain a controlled object equivalent damping parameter; a coordinate value on a time axis in a position of a speed output signal stable-state amplitude of 0.632 times is measured; and a time value is multiplied by the equivalent damping parameter, so as to obtain a controlled object equivalent inertia parameter. The invention has better static property and dynamic property.

Description

technical field [0001] The invention relates to a DC motor speed system and control method, in particular to a DC motor speed control object parameter identification system and identification method. Background technique [0002] DC motor speed control must adopt closed-loop control to obtain excellent speed control performance. Only the qualitative understanding of the controlled object can determine what kind of controller to design, and only the quantitative identification of the controlled object parameters can accurately adjust the controller parameters. At present, the known controllers in the prior art, such as the widely used PID (proportional-integral-derivative) controller, do not first determine the parameters of the controlled object, but directly adjust the proportional control parameters of the controller by trial and error or empirical methods , integral control parameters and differential control parameters. Therefore, the adjustment of the controller param...

AI Technical Summary

Problems solved by technology

Therefore, the adjustment of the controller parameters is relatively blind, the debugging of the DC motor speed control system is time-consuming and laborious, the speed control performance is difficult to meet the requirements, and some even cannot control the speed at all.

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