چکيده
Presenting studies of rotational (RPZTEH) piezoelectric harvesters and demonstrating the effect of excitation elements such as (mass(M), magnetic(Mg), spring(Sp) and centrifugal ) in maximizing low frequencies, decreasing the natural frequency of harvester model in order to the resonance phenomenon is obtained (piezoelectric resonance frequency) consequently , the maximum voltage from the rotational mechanical energy input is obtained.
