Measurement of the transient electrical and shaft torques in an induction motor drive by the indirect two-speed method

Sensitivity of Torsional Modes and Torques to Uncertainty in Shaft Mechanical Parameters

“…Downloaded by [University of Colorado at Boulder Libraries] at 04:55 03 January 2015 T his paper, as a continuation of the authors' research in this area [19,20], summarizes the results of a comprehensive study of the in uence of mechanical parameter's uncertainty on torsional oscillations. T he study deals with the eOE ects that mechanical parameters, namely inertia, spring constant, and internal and external damping, have on damping, frequency, and mode shapes of torsional modes and on maximum torsional torques in the turbine-generator shaft.…”

New Digital Multispeed Method for Indirect Measurement of Transient Electrical and Shaft Torques

“…Two-mass system drive ( Figure 3) Table 1 indicates two algorithms for indirect measurement (calculation) of transient electrical and shaft torques, GIMSM1 and GIMSM2, which are described in detail in [7,10]. The main characteristic of both methods is that in a given transient process only the transient speeds for all inertia elements ought to be measured and recorded in real time.…”

“…Algorithm GIMSM2 for calculating transient torques has an important advantage with respect to GIMSM1 [7]. The torque components depending on speed integral and nonlinear damping and stiffness factors D i,i+1 and K i,i+1 (practically constant only up to a certain torque value [11]) are replaced by the sum of counteracting torques, depending only on speed and speed derivatives with a constant coefficient and passive (load) torque.…”

“…In previous papers [7,8], the authors had discussed a number of existing electrical and mechanical methods for measuring electrical and shaft torques. Also, they had exposed some of the characteristic features of the Indirect Two-Speed Method (ITSM).…”

Extremely wide speed range measurement system

“…͓DOI: 10.1063/1.1454118͔ Extremely wide speed measurement range enables accurate real-time control and suppression of shaft's oscillations. 1 Low angular velocities are usually measured by the period measurement method. High angular velocities are usually measured by the pulse counting method.…”