Search

In this paper, a new motor integrated permanent magnet gear (MIPMG) is discussed. The focus is on eddy current loss analysis associated to permanent magnets (PMs). A convenient model of MIPMG is provided based on 2-D field-motion coupled time-stepping finite element method for transient eddy current analysis. The model takes the eddy current effect of PMs into account in determination of the magnetic field in the air-gap and in the magnet regions. The eddy current losses generated in the magnets are properly interpreted. Design improvements for reducing the eddy current losses are suggested. The proposed model and the results presented in this paper will give useful guidelines for a reliable design and design optimization of the MIPMG. [ABSTRACT FROM PUBLISHER]

A novel transverse-flux moving-magnet linear oscillatory actuator (TMLOA) for a compressor is proposed and analyzed, which features a unique configuration composed of usual laminated stators and moving-magnet mover. It not only offers low manufacturing cost and great dynamic characteristics, but also provides high thrust force density for its transverse flux path. The magnetic field and thrust force are analyzed by three-dimensional finite-element model. The proposed model is also used for studying effects of the axial dimensions variation on the thrust force and stroke, and then the selection of axial parameters is obtained with reference to the amplitude and smoothness of thrust force. Finally, the measurements of a prototype validate the predicted results. It shows the proposed TMLOA is very suitable for linear reciprocating motion drive applications such as compressors and pumps. [ABSTRACT FROM AUTHOR]

In order to reduce the thrust ripple of linear servo system, a double-sided air core permanent magnet linear servo motor with trapezoidal shape permanent magnets (TDAPMLSM) is proposed in this paper. An analytical model of the motor for predicting the magnetic field in the air-gap at no-load is introduced. This model is derived based on the equivalent magnetization intensity method, and its accuracy is validated by using the results obtained from the finite-element method. The key dimensions that affect the air-gap magnetic field are analyzed based on the analytical model, and the design is optimized by using genetic algorithm. A thrust ripple reduction of 70.6% is achieved by optimization. The proposed analytical model may be used for a quick and reliable design and design optimization of the TDAPMLSM. [ABSTRACT FROM AUTHOR]