DETERMINATION OF THE RIPPLE FACTOR OF THE VOLTAGE OF SINGLEPHASE THREE SIDED RECTIFIER

Abstract

Monophase thyristor rectifiers are used for the supply of windings of excitation and windings of armature of DC motor by power to 5 kVt in the machineries of serve of metal-working machine-tools. The coefficient of pulsations of voltage is one of basic operating descriptions of thyristor rectifier. Difficult character of dependence control angle by thyristor, electromagnetic permanent time of circle of armature and loading on the billow of engine eliminate possibility of its receipt in an analytical kind. Dependence of coefficient of pulsations of voltage on the indicated factors is definite with the use of computer model, as windings of excitation and windings of armature of engines of direct current behave to the class of the determined systems. Researches of dependence of coefficient of pulsations of voltage were conducted as follows. For three values of power DC motor dependences of coefficients of pulsations of voltage separately from each of influences were determined: control angle by thyristor, the electromagnetic became to time of circle of armature and loading on the billow of DC motor, during stabilization the two other. The control angle by thyristor was set by the delay of impulses of control on a model, electromagnetic permanent to time was set by the change of inductance of circle of armature, the current of loading was set by the change of size by electric motive force of armature. By the method of complete factor experiment analytical dependences of coefficient of pulsations of voltage, which, are definite, in obedience to a method, are goal functions. The method of determination of coefficient of pulsations of voltage of monophase thyristor rectifiers, which consists in the following, is offered as a result: 1) nominal passport data of engine are set: voltage, current, moment spped; 2) on computation middle regulation speed are determined relative and absolute value of permanent constituent of the straightened tension; 3) on the relative value of permanent constituent of the straightened tension
the middle control angle by thyristor in radianah is determined; 4) on the computation middle moment of loading the relative value of permanent constituent of current is determined; 5) the number value of coefficient of pulsations of voltage and virtual value of variable component tention are determined.