Variable-pitch system and unmanned aerial vehicle

Abstract

The invention discloses a variable-pitch system and an unmanned aerial vehicle; the variable-pitch system comprises a tilting mechanism and a variable-pitch mechanism; the tilting mechanism comprisesa tilting steering engine and a first transmission assembly, and the tilting steering engine is connected with the variable-pitch mechanism through the first transmission assembly; the tilting steering engine is used for controlling the variable-pitch mechanism to tilt relative to the tilting steering engine; the variable-pitch mechanism is used for adjusting an attack angle of a rotor wing; the variable-pitch system drives the rotor wing to tilt and pitch, so rapid switching of the rotor wing of the unmanned aerial vehicle in different flight modes and switching of a positive attack angle anda negative attack angle are achieved, and the use efficiency of a motor and the endurance of the unmanned aerial vehicle are improved.

Description

technical field [0001] The invention relates to the technical field of unmanned aerial vehicles, in particular to a range-changing system and an unmanned aerial vehicle. Background technique [0002] With the development of drone technology, especially the rapid development of flight control technology in recent years, the performance of drones has been continuously enhanced and the types have become more diversified. Multi-rotor drones have the advantages of simple operation, easy maintenance, vertical take-off and landing, and fixed-point hovering, but they are slow, inefficient, and short in flight time. Although fixed-wing UAVs have the advantages of fast speed, high efficiency, and long flight time, they cannot take off and land vertically. Both take-off and landing require a long runway, which restricts the use environment of fixed-wing UAVs. The vertical take-off and landing fixed-wing UAV combines the advantages of both multi-rotor and fixed-wing UAV. It has the adv...

AI Technical Summary

Problems solved by technology

However, there are still certain problems in the tilting-rotor drones in the prior art: the existing tilting-rotor drones use a power system, and the propellers with the same pitch are used to realize vertical take-off and landing and peaceful flight by tilting the power system.

Due to the big difference between the flight speed and the pulling force provided by the motor during the take-off and landing phases and the cruise phase, the response speed through variable speed adjustment is slow, the adjustment range is small, and the controllability is poor. It is easy to saturate the motor drive and affect a certain state. flight efficiency under

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