Abstract
This paper proposes two quasi-zero power control methods for permanent magnet levitation systems. The system consists of a radially magnetized permanent magnet, two symmetrically arranged iron cores, a servo motor with an encoder, and a bar-shaped suspended object. In this system, the servo motor drives the permanent magnet to rotate, changing the magnetic flux through the suspended object, and realizes the non-contact suspension of the suspended object. Due to the special structure of the system, the system has quasi-zero power characteristics. In this paper, the constant angle control method and the constant air gap control method are used to study the quasi-zero power characteristics of the system under the action of radial interference force. The results show that both control methods have lower current consumption. Under the constant air gap quasi-zero power state, it can not only reduce energy consumption but also ensure stability.