| 摘要 |
Procedure and device for measuring speed of revolutions of direct current electric machines with separate excitation, is achieved by induction coil (IK) which is the subject of this invention, while the accurately defined technical problem of measuring speed of revolutions (n) is solved by firm fixation of induction coil (IK) in deliberately chosen position in the vicinity of the housing of the machine under testing. Having started the machine in the nominal loading and its bringing into a standard operating conditions, first of all to carry out is to determine the parameters of the coil (k), being determined by the quotient of the measured effective value of the induced electromotor power in the coil (En) and measured nominal speed of the revolutions of the machine (nn). In the procedure to follow any value of the speed of revolutions of the machine (n) is determined by the quotent of the measured appropriate effective value of the induced electromotor power in the coil (E) and previously determined constructional constant of the coil (k). Therewith, in a relatively short time both accurate and reliable data for unknown values of the speed of revolutions of the tested machines for direcet current with separate excitation.
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