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This paper presents a subdomain model suitable for high-speed surface-mounted permanent-magnet machines. The model is presented with a focus on computation time and calculations of some relevant values particular to high-speed machines. The results are compared to both finite element analysis simulations and measurements on an existing prototype. The good accuracy and the high computation speed of...
To solve the velocity-measurement difficult problem of linear motor in high speed and high acceleration occasions, a velocity-measurement method based on teeth-slots signals detection is proposed in this paper. In this method, the speed signal is obtained from the inductance periodic variation of probe coil, and the "teeth-slots" bar consisting of conductor and ferromagnetic materials alternating...
In order to calculate the stray losses and to avoid overheating hazard as accurately as possible in metal structural parts of power transformer with less computational effort, an analysis method which combined FEM and analytical method is presented. Based on the magnetic flux density and eddy current density on the surface of metal structural parts which are obtained by FEM, the stray losses of power...
Parallel computing of three dimension (3D) linear steady eddy current problem based on element by element (EBE) method is proposed in this paper. Compared with the classical finite element method (FEM), EBE technique shows a different way in storing matrix, solving equations and dealing with boundary condition. Then Jacobi preconditioned bi-conjugate gradient (BiCG) method is used to solve equations...
In-wheel type permanent magnet synchronous motors (PMSMs) for electric city commuters are required to be compact and light in weight in order to utilize limited wheel space effectively and reduce unspringing weight. Therefore our previous papers presented a low cost in-wheel axial gap motor using ferrite permanent magnets. This motor adopted open slot structure to reduce production cost. However,...
This paper presents the analysis of rotor eddy current loss with different permanent magnet magnetization directions in high speed permanent magnet brushless DC (PM BLDC) motor. Transient analysis is performed by time stepping finite element method which takes into account the induced eddy current, non-linearity, non-sinusoidal field and material saturation; which are very difficult to include in...
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