Friction-piezoelectric-magnetoelectric compound three-dimensional space multi-degree-of-freedom micro-energy acquisition device

The invention relates to an energy acquisition technology of mechanical energy, and particularly relates to a friction-piezoelectric-magnetoelectric compound three-dimensional space multi-degree-of-freedom micro-energy acquisition device which comprises electromagnetic induction coils, an external spherical shell, a buffer layer, a piezoelectric layer, a frictional layer, an internal spherical shell and a magnet ball which are arranged from outside to inside in turn. All the coils are connected in a series mode; the buffer layer is arranged between the external spherical shell and the piezoelectric layer in a spacing way and aims at increasing piezoelectric deformation quantity and then enhancing power generation capacity; and positive materials and negative materials in frictional units are arranged in an alternating way, all the positive materials are connected together, all the negative materials are connected together, and charge transfer between the positive material and the negative material is realized by rolling of a movement unit between the positive material and the negative material. Mechanical energy acquisition of multi-degree-of-freedom movement modes is realized by utilizing three-dimensional space rolling of the movement unit in the hollow spherical shell; and piezoelectric, magnetoelectric and frictional power generation units with complementary working modes are integrated so that high-efficiency acquisition of mechanical energy is realized.