The next step in modal testing analysis was to analyse the electric motor as an assembly. There were considered five different hit points situated on the electrical motor. Two of them are presented in Fig. 11.
The recorded time domain signals have the shape presented in Fig. 12 and the frequency domain response is shown in Fig. 13.
Based on the recorded data there were obtained seven experimental natural frequencies in the range 0 ÷ 2000 Hz: 9.5 Hz; 10.5 Hz; 18.0 Hz; 21.5 Hz; 723 Hz; 1098 Hz and 1640 Hz.