In the frequency dependence emf Matteucci of the ribbon with helical magnetic anisotropy two linear sections are found. The hysteresis loop at the center frequency (10 kHz) of the first section is asymmetrical and at the frequency 29.5 kHz of the second section is nearly symmetric. At transition from 10 kHz to 29.5 kHz the coercive force on the descending branch changes slightly while on the ascending branch it increases greatly. According to this the time dependence of the domain wall coordinate at 29.5 kHz indicates a strong damping of the domain wall motion on the ascending branch and a little damping on the descending branch. Probably, the Bloch lines motion is considerably depressed on the descending branch at 29.5 kHz as a result of the frequency increase.