[Objective] In response to the high requirements including torque density

operating efficiency

and reliability for large transmission components used in aviation

as well as the mechanical gears have problems including easy wear

lack of overload protection

and high maintenance costs. Therefore

a large magnetic field modulation gear is designed in this paper. [Methods] Through analysis for the structural characteristics and design requirements of large magnetic field modulation gears which used in aviation

torque transmission density would be increased as much as possible while considering performance such as efficiency and torque fluctuation. A nonlinear constrained genetic algorithm was used for multi-objective optimization design. Based on the optimized electromagnetic design scheme

finite element method was used to analyze the electromagnetic characteristics

stress distribution characteristics for key components

and temperature rise during operation. [Results] According to the results of multi-physics field analysis

the output power of the proposed magnetic field modulation gear had been reached 500 kW. It could operate smoothly with an efficiency reached 96.17%. The laminated magnetic adjustment block and permanent magnet laminations could effectively reduce core-loss. During its stable operation

the stress of key components inside the rotor could meet the strength requirements by using carbon fiber as the rotor binding sheath

and the temperature of each component had not exceed the allowable material temperature. [Conclusion] The analysis results have verified the rationality and feasibility for the design

which providing a theoretical basis for the design and application of large aviation magnetic field modulation gears

and having certain engineering reference value.