Research on the Discrete-time Control System of Electromagnetic Speed Regulating Shearer

ABSTRACT

On the basis of review research on the control mechanism of the electromagnetic speed regulating shearer, a mathematical model with dual-loop control system of continuous-time system of electromagnetic speed regulating shearer was built. According to the control types and characteristics of each link in the continuous control system, the pulse transfer function was adopted in the discrete time domain to deduce the expression form of Z transformation parameters system of the discrete-time model. The stability of the system and operation characteristics of electromagnetic speed regulating shearer were analyzed on the Z plane; the response curves of discrete controller and frequency response curve of the system of the step signal were simulated in the zero-order holder. By combining the actual electromagnetic speed regulating shearer, the relevant application programs were written to respectively test the electromagnetic speed regulating shearer in the dual–closed loop control system under the conditions of no-load, free parking and the applied load so as to contrast the consistency of test data and simulation results.

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