Abstract:In order to meet the requirement of fast, agile and large angle maneuver satellite. We designed a kind of permanent magnet motor which can output large torque for flywheel based on double-layer magnetic steel rotor. This paper introduces the working principle and structure of this kind of motor. And it gives the design criterion of main dimensions, and uses the finite element analysis method to simulate the kind of permanent magnet DC motor based on double-layer magnetic steel rotor by using the MAXWELL software.