In this paper, an interior permanent magnet (IPM) machine having two sets of windings with different number turns is developed to improve the limited flux-weakening (FW) capability and efficiency, simultaneously. The flux-adjustable range appears be somewhat because maximum inverter voltage high magnetic saturation, which degrades FW capability. To address its restricted capability, a unique wi...

Permanent magnet machines have been used in the high-speed drive applications due to their high-efficiency, high-power-density, and wide-speed range characteristics. However, control of such permanent machine is always challenging proper flux-weakening controller design essential achieve high performance these machines. In this paper, an improved feedforward scheme for interior synchronous (IPM...

Performance evaluation of an axial flux surface mounted permanent magnet (PM) field controlled TORUS type (FCT) disc machine is presented in this paper. This new machine is an axial flux configuration with true field weakening capability since the flux is controlled by the DC field winding rather than opposing the magnets. Structure and operating principles are summarized in the first section. ...

In this article, a new variable leakage flux reverse salient-pole motor (VLF-RSPM) is raised to widen the speed range. The innovation realize both characteristics and by using method of adding magnetic bridges barriers. Firstly, evolution topological structure working principle are introduced. Secondly, based on 2D Finite Element Analysis (FEA), electromagnetic properties noise analyzed in deta...

Abstract The large-scale diffuse γ − ray flux observed by Fermi Large Area Telescope (Fermi-LAT) in the 1–100 GeV energy range, parameterized as ∝ E −Γ , has a spectral index Γ that depends on distance from Galactic center. This feature, if attributed to emission produced cosmic rays interactions with interstellar gas, can be interpreted evidence of progressive hardening towards interpretation ...

To improve the motor efficiency and expand actual external characteristic region of electric vehicle permanent magnet synchronous (PMSM) drive systems, optimal operation mapping torque to d-q axis current is usually applied. Nevertheless, it difficult deal with complex mechanism factors such as parameter saturation temperature change for traditional optimization method based on basic voltage eq...

Permanent magnet motors have been considered for a variety of applications due to their features such as high power density and high efficiency. One of the issues that should be investigated in the design of these motors is the demagnetization problem. Usually, the demagnetization analysis is carried out in a steady state, while demagnetization effect in dynamic condition is more considerable d...