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This invention discloses an end effector for unmanned aerial vehicles (UAVs), comprising: a robotic gripper module, a motion drive module, and a power output module. The motion drive module is connected to the robotic gripper module, and the motion drive module is also connected to the power output module. The robotic gripper module includes a fixed base and multiple robotic grippers. Each robotic gripper includes a rear gripper piece, a front gripper piece, and a connecting chain. The rear gripper piece and the front gripper piece are hinged together by a connecting pin to form a motion joint. A protective cover is provided outside the motion joint. The connecting chain sequentially connects the fixed base, the rear gripper piece, the motion joint, and the front gripper piece. The end effector of this invention is lightweight and compact, allowing it to be mounted on a UAV. The encased shell greatly reduces interference, occupies little space, and is adaptable to various application environments. The robotic gripper of this invention utilizes the elastic potential energy of a spring during retraction, requiring no energy consumption and effectively extending the device's operating time.

The utility model provides a dual motor outputting three groups of equal power, which comprises a first permanent magnet generator and a second permanent magnet generator which are fixed on the input and output ends of an engine crankshaft in a one-to-one correspondence manner, the number of branches of generators in the first permanent magnet generator and the second permanent magnet generator is 3N, N is a positive integer, and N is a positive integer. The three-phase windings of the 2N branches in the first permanent magnet generator are superposed and output in a one-to-one correspondence manner to obtain a first group of output power, and the three-phase windings of the remaining N branches in the first permanent magnet generator and the three-phase windings of the N branches in the second permanent magnet generator are superposed and output in a one-to-one correspondence manner to obtain a second group of output power; and the three-phase windings of the remaining 2N branches in the third permanent magnet generator are superposed and output in a one-to-one correspondence manner to obtain a third group of output power, and the three groups of output power are equal. The utility model also provides an inversion device for outputting three groups of equipower double motors. The generators are connected to the input end and the output end of the engine crankshaft so that the crankshaft can be balanced, the service life of the crankshaft is prolonged, and reliability of the crankshaft is improved.