Brushless DC (Direct Current) motor for unmanned air vehicles

Abstract

The invention relates to a brushless DC (Direct Current) motor for unmanned air vehicles, belonging to the technical field of unmanned air vehicle powerplants. The brushless DC motor comprises an external rotor composed of a rotor end cover, a rotor yoke and a permanent magnet, a stator composed of a winding, a stator iron core and a stator yoke, an upper bearing, a lower bearing, a rotation shaft and a stopper ring, wherein the outer diameter of the rotor yoke is the same as that of the rotor end cover, the rotor yoke is fixed at the lower end of the rotor end cover, the permanent magnet is fixed on the inner wall of the rotor yoke, and the number of magnetic poles of the permanent magnet is 24; the stator iron core comprises 18 slots, the stator yoke is sleeved on the inner wall of the stator iron core, and the winding is coiled on the outside of the stator iron core; the upper bearing and the lower bearing are respectively fixed on two ends of the rotation shaft; the stator is connected with the rotor through the rotation shaft, the stator is embedded inside the rotor end cover, and the stopper ring is sleeved on the rotation shaft. In the invention, by directly driving airscrews, the brushless DC motor is beneficial to elimination of efficiency loss of a driving system, and improvement of lift force / power consumption ratio and lift force / mass ratio of air vehicles.

Description

technical field [0001] The invention belongs to the technical field of electric motors and unmanned aerial vehicle power devices, is applicable to the fields of small multi-rotor unmanned aerial vehicles, model airplanes, etc., and relates to a brushless DC motor for unmanned aerial vehicles. Background technique [0002] At present, the power device of the micro unmanned aerial vehicle (UAV) uses the electric motor to drive the propeller as the power system, and the high-performance lithium polymer battery is used as the main energy system, such as the Black Widow of AeroVironmen in the United States, the Micro Star of Sanders, MLB's Trochoid, Germany's Microdrone's MD series and aircraft 650D, etc. In the UAV concept originally proposed by Davis et al., the total aircraft mass accounts for 12.3%, while the propulsion system accounts for 73.4%, and the first-generation BlackWindow structure mass ratio of 15cm size is only 17%. Therefore, in addition to reducing the structu...

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Problems solved by technology

[0004] In order to solve the problem of low lift / power consumption ratio, lift / mass ratio and lift / power consumption / mass ratio of the existing micro unmanned aerial vehicle power plant, the present invention proposes a combination of 18 slots and 24 poles. External rotor brushless DC motor for unmanned aerial vehicles

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