The excitation generator is widely used in special vehicles, but there are shortcomings of weak low-speed load-carrying capacity and low power density. In view of the shortcomings of the regulator control excitation generator, this paper designs a higher energy density, low-speed load carrying capacity can output ± 28 V power supply of the double-winding permanent magnet synchronous generator controller, from the overall program design, the main parameters of the design, structural design of the three aspects of the design of the controller, after the performance simulation and physical performance tests can be concluded that the permanent magnet generator controller is not only After the performance simulation and physical performance test, it can be concluded that the permanent magnet generator controller not only has high power density and strong load carrying capacity, but also has high output voltage precision, strong stability and strong dynamic adjustment ability.