AC Electric Motors Control by Fouad Giri

Author:Fouad Giri
Language: eng
Format: epub
ISBN: 9781118574249
Publisher: Wiley
Published: 2013-03-21T16:00:00+00:00

Figure 14.2 Experimental setup (left) and a drilled rotor-cage bar (right)

Figure 14.3 Laboratory test rig with IM and DC motor load

BBF has been realized by drilling a single rotor bar (see right plot of Figure 14.2), whereas EFs have been reproduced by suitable hardware modification. We have tested respectively a machine with 0.2 mm of static eccentricity, and a second one with, in addition, 0.07 mm of dynamic eccentricity.

Table 14.3 summarizes the experimental condition tests carried on the load conditions in terms of slip’s percentage, the measured speeds, and the theoretical sideband frequencies associated with (see equations (14.2) and (14.6)). The electromechanical motor parameters needed for the observer implementation are derived from the motor’s data sheet’s. After few trial and error tests, devoted to guarantee an accurate convergence to zero of the measurable estimation errors e1, e2, and e3 in healthy operating condition, the observer gains in all tests have been set as follow

(14.27)

Offline computations are done in the MATLAB environment. The observer scheme is digitally implemented by means of Euler discretization with sampling time Ts = 10−4 s. Spectral analysis are made using a time window of 7 s.

Table 14.3 Experimental working condition for the broken bar and eccentricity tests and fundamental fault sideband frequencies

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