Servo, control method, and unmanned aerial vehicle

An unmanned aerial vehicle (UAV), comprising:

• a central part;
• a frame assembly including a linkage assembly and an arm, wherein:
• the linkage assembly has a first connecting mechanism connected with the central part, a second connecting mechanism connected with the arm, a transmission mechanism mounted to the central part, and a primary link connected with the transmission mechanism, the first connecting mechanism is disposed at a first end of the linkage assembly, and the second mechanism is disposed at a second end of the linkage assembly opposite to the first end;
• and
• the linkage assembly further comprises two ends connected to the central part and a secondary link of the arm, the secondary link being connected to the arm through a third connecting mechanism having a bent shape.