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This paper presents a novel configuration of the permanent magnet system for rotating magnetic refrigerator, which consists of stator and rotor. The stator of this system includes two permanent magnets and iron yoke. The rotor includes shaft, iron core and magnetic refrigerant material. When the magnetic refrigerant material is located under the pole of the permanent magnet, it is magnetized by a...
Considering the characters of high permeability, high resistivity, low loss and low cost for soft magnetic ferrite in high-frequency alternating magnetic field, this paper proposes a novel high speed permanent-magnet motor based on soft magnetic ferrite. Soft magnetic ferrite ring is used for stator core, rare earth permanent magnet ring serves as the rotor poles, and the slotless configuration with...
Rotor losses of axial flux permanent magnet (PM) synchronous machines with fractional windings depend on stator magneto-motive force (MMF) harmonics. To reduce rotor losses, a soft magnetic composite rotor can be used. This paper focuses on the comparison between two machines with the same soft magnetic composite stator and different rotor cores: one of solid steel and another of soft magnetic composite...
Cogging torque in permanent magnet machines causes torque and speed ripples, as well as acoustic noise and vibration. It is important to be able to accurately measure the cogging torque. This paper describes a simple test method for measuring the cogging torque waveform, together with finite element analyses. It is based on measuring the reaction torque on the stator and is suitable for both single-phase...
In this paper the flux linkage between the permanent magnets in the rotor and the stator core of a Transverse Flux machine is investigated, with a special focus on the flux concentrating setup, which allows to utilize the core materials up to their saturation limits. FEM simulations are carried out to find the relation between the flux linkage and the size of the permanent magnets. Finally new design...
The flux reversal machine (FRM) is a new machine that has a simple robust rotor with a permanent magnet installed stator. [Y. Liao et al., 1995][T.A. Lipo et al., 1997] However, the parameters of the FRM are dependant on the position of the rotor, operating temperature and magnetic saturation of the motor core. To obtain a robust performance of the single phase FRM, a control method that introduces...
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