Design and analysis of double magnetic circuit rotating Lorentz force magnetic bearing

A Lorentz force magnetic levitation universal stability platform was proposed in response to the pressing need for universal agility and ultra-precise pointing performance of spacecraft payload in complex space missions. The design and analysis of double-magnetic circuit rotating Lorentz force magnetic bearings were conducted, and the moving coil rotor scheme was chosen. The four-hanging lug-shaped coils of the rotor assembly were wound in pairs and glued into the grooves on both sides of the skeleton axial direction. The stator components are arranged in pairs in parallel with a common rotating shaft and a double annular axial magnetized magnetizer to create a uniform and stable magnetic density, and provide a circumferential dual-channel symmetrical working air gap for the agile maneuver of the load compartment. Based on the equivalent magnetic circuit method, the magnetic density model of the air gap was established, and the linearity of the magnetic density was defined from the two aspects of the uniformity and fluctuation rate of the magnetic density of the air gap, and then the rotor rotation dynamics was modeled and the rotational moment model was constructed. Utilize Maxwell's finite element method to establish a finite element model for rotary magnetic bearings and conduct the simulation, the results demonstrate that the magnetic density at the center position of the air gap rotation envelope of the rotating magnetic bearing scheme can reach 685.624 mT, and the circumferential magnetic density uniformity is 99.72%. This significantly improves the uniformity of air gap magnetic density, avoids the limitations of radial magnetization schemes such as air gap magnetic density attenuation and longitudinal magnetic field diffusion, and effectively enhances the stability and pointing accuracy of the payload bay under rotating conditions.