Abstract
The hysteresis motor technology combined with the magnetic suspension makes bearingless hysteresis drives very appealing for high- and ultra-high-speed applications. Such systems exploit the magnetic behavior of the rotor material to achieve mechanical torque, but the hysteresis can significantly influence the magnetic suspension performance. The literature so far has focused mainly on the motor investigation. On the bearing side, the design and the performance assessment have been carried out by neglecting the hysteresis phenomenon of the rotor material. In those cases, the hysteresis of the rotor material is negligible and hence it slightly affects the force generation. In a wider perspective, this paper intends to investigate the force capability of electromagnetic actuators based on materials of large magnetic hysteresis behavior. To this purpose, the proposed numerical model, based on the finite element method, accounts for the magnetic hysteresis. The experimental results confirm the validity of the modeling approach, thus providing a useful tool for the design as well as the investigation of such systems.
Highlights
Semi-hard magnetic materials (SHMMs) are of great interest for high- and ultra-high-speed rotating electric machines because of their elevated mechanical strength and advantageous magnetic features
This paper presents the force characterization of an electromagnetic actuator based on FeCrCo 48/5 SHMM
The comparison between 2D and 3D results shows that there is no influence of the end-field effects; the 2D model can be used for further analyses
Summary
Semi-hard magnetic materials (SHMMs) are of great interest for high- and ultra-high-speed rotating electric machines because of their elevated mechanical strength and advantageous magnetic features. The magnetic hysteresis loop of these materials can be activated to yield mechanical torque. This principle is narrowed nowadays to very few motor applications due to the limited power density with respect to other electric machine solutions. At high speed, the simple structure and rotordynamic features of hysteresis motors allow unmatchable power density [1,2]. The magnetic behavior of SHMMs can be used to achieve levitating forces, leading to magnetic bearing applications. Active Magnetic Bearings (AMBs) and electric motors have very similar construction
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