RS20070340A - Procedure and device for measuring mechanical power of direct current motors with independent and parallel excitation
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Procedure and device for measuring mechanical power of direct current motors with independent and parallel excitation
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RS20070340A
RS20070340ARSP-2007/0340ARSP20070340ARS20070340ARS 20070340 ARS20070340 ARS 20070340ARS P20070340 ARSP20070340 ARS P20070340ARS 20070340 ARS20070340 ARS 20070340A
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Application filed by Andreja Todorović, Miroljub JevtićfiledCriticalAndreja Todorović
Priority to RSP-2007/0340ApriorityCriticalpatent/RS20070340A/en
Publication of RS20070340ApublicationCriticalpatent/RS20070340A/en
Tests Of Circuit Breakers, Generators, And Electric Motors
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Abstract
Procedure and device for measuring mechanical power (P) of direct current motors with independent and parallel excitation (MJS), is achieved as shown in Figure 1 by coupling brushes (Č) set at the endings of a shaft (V) of a machine rotor, insulated conditioner (IKU) for measuring alternate voltage (u=u(t)) between brushes and other components. Therewith accurately defined is technical problem of measuring mechanical power (P) is solved in details and reliably in a relatively short time and by more positive technical economic effects compared to the known solutions comprised in the state of art. Measuring gives instantaneous value of alternating voltage at the chosen time periods from (10-50) μs which, as a complex period function of time expands into harmonics of a Fourier series, where first of all by determining the predominant harmonics, and then the quotient of that harmonics and the chosen measuring the time (t) during unknown and nominal loading whereby obtained is the frequency of the equivalent of simple periodic sinusoidal function of time for that voltage, and finally according to the equation (11) the required mechanical power (P) of considered engines (MJS).
RSP-2007/0340A2007-08-092007-08-09Procedure and device for measuring mechanical power of direct current motors with independent and parallel excitation
RS20070340A
(en)