A permanent magnet synchronous motor (PMSM) with rotor embedded segmented permanent magnet was analyzed. The structural features and flux weakening principle are introduced. The shape of the rotor is optimized to get a sinusoidal air gap magnetic density waveform and reduce the toque ripple. The whole-permanent-magnet (PM) motor and the segmented-permanent-magnet motor are compared from the asp...

BACKGROUND It is not clear whether Magnet recognition by the American Nurses Credentialing Center (nursing excellence program) is associated with improved patient outcomes. We investigated whether hospitalization in a Magnet hospital is associated with improved outcomes for patients with ischemic stroke. METHODS AND RESULTS We performed a cohort study of patients with ischemic stroke from 200...

Comparison of two approaches for the simulation of the dynamic behaviour of a permanent magnet linear actuator is presented. These are full coupled model, where the electromagnetic field, electric circuit and mechanical motion problems are solved simultaneously, and decoupled model, where first a set of static magnetic filed analysis is carried out and then the electric circuit and mechanical m...

This article presents a vibration diagnostic method designed for Permanent Magnets (PM) electrical machines–traction motors and generators. Those machines are commonly used in traction drives of electrical vehicles and small wind or water systems. The described method is very innovative and unique. Specific structural properties of machines excited by permanent magnets are used in this method e...

A nonlinear model structure for a permanent magnet DC-motor, appropriate for simulation and controller design, is developed. The essential nonlinearities are due to coulomb friction and to voltage and velocity dependent brush resistance. The physical parameters of the nonlinear model are estimated directly, using a sensitivity approach for input design and evaluation of relative accuracy of the...

Two novel structures of permanent magnet (PM) machine, namely a hybrid excitation flux modulation machine (HEFMM) and a variable flux memory machine (VFMM), which have excellent field-weakening capability, are presented in this paper. The HEFMM incorporates the advantages of parallel hybrid excitation structure and flux modulation structure, so as to increase the torque density as well as incre...

Static and dynamic magnetic properties of the tetracoordinate CoII complex [Co(CH3-im)2Cl2], (1, CH3-im = N-methyl-imidazole), studied using thorough analyses of magnetometry, and High-Frequency and -Field EPR (HFEPR) measurements, are reported. The study was supported by ab initio complete active space self-consistent field (CASSCF) calculations. It has been revealed that 1 possesses a large m...

We report on an instrument for applying ac and dc magnetic fields by capturing the flux from a rotating permanent magnet and projecting it between two adjustable pole pieces. This can be an alternative to standard electromagnets for experiments with small samples or in probe stations in which an applied magnetic field is needed locally, with advantages that include a compact form-factor, very l...

The present paper will approach the design and analysis of a permanent magnet synchronous motor (PMSM) for automotive electromechanical braking (EMB) system. Due to technological and cost constraints, for the PMSM prototype a slightly different topology of the rotor is proposed. Finite element method will be used for analyzing the static performances of the former topology, and compare them wit...

Who knows when our ancestors first became aware of electricity and magnetism? I imagine a primitive cave person, wrapped up in mastodon fur, desperately trying to stay warm in the dead of winter, suddenly seeing a spark of static electricity. Maybe at the same time in our prehistory someone felt a small piece of iron jump out of their hand toward a lodestone. Certainly lightning must have been ...