FIELD: electric cars, underground trains, other wheeled transport. SUBSTANCE: voltage is periodically picked off multilayer cylindrical sections of piezoelectric material placed near rim when wheel is rocking. Strain of sections is produced due to pressure of liquid in their location place. Liquid pressure is built up due to vehicle mass or centrifugal force of weights on wheel spokes. EFFECT: improved design. 3 cl, 5 dwg
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