The evolution, design and test results of a novel permanent magnet generator for use in direct-drive wind turbines are presented. The novelty in the concept lies in the arrangement of electromagnetically active components – magnets, steel and copper – such that the structural mass can be reduced. It has also been designed such that during the assembly of large diameter permanent magnet machines...

Introduction Development of mobile NMR and MRI has been pursued since the pioneering work on well-logging, in order to reach the performance of high-resolution systems. Permanent magnets are the key to such mobile systems and the development of rare earth NdFeB and SmCo materials allows the generation of high strength magnets. However, most systems currently used are based on bar magnets or Hal...

Although the US has sufficient raw materials, domestic supply chain to alloy and manufacture rare-earth permanent magnets is almost nonexistent.

CONTEXT Chronic low back pain is one of the most prevalent and costly medical conditions in the United States. Permanent magnets have become a popular treatment for various musculoskeletal conditions, including low back pain, despite little scientific support for therapeutic benefit. OBJECTIVE To compare the effectiveness of 1 type of therapeutic magnet, a bipolar permanent magnet, with a mat...

We have reflected a Stark-decelerated beam of OH molecules under normal incidence from mirrors consisting of permanent magnets. Two different types of magnetic mirrors have been demonstrated. A long-range flat mirror made from a large disc magnet has been used to spatially focus the reflected beam in the longitudinal direction (”bunching”). A short-range curved mirror composed of an array of sm...

The magnetic field of a permanent magnet is calculated analytically for different geometries. The cases of a sphere, cone, cylinder, ring and rectangular prism are studied. The calculation on the axis of symmetry is presented in every case. For magnets with cylindrical symmetry, we propose an approach based on an expansion in Legendre polynomials to obtain the field at points off the axis. The ...

We report on the current status of the technical design and results of tests of some components of a compact racetrack microtron (RTM) which is under construction at the Universitat Politècnica de Catalunya (UPC). The RTM end magnets are four-pole systems with the magnetic field created by a rare-earth permanent magnet material. As a source of electrons a 3D off-axis electron gun is used. These...

The characteristics of the synchrotron radiation generated by an electron beam in bending magnets, planar undulators and wiggler magnets are derived, with emphasis on the spectral flux, brilliance, and power densities. The interaction of the electron beam with the insertion device field is discussed in terms of closed orbit distortion, tune shift and non-linear effect. The technology of permane...

In this paper we want to describe proposal of the fuzzy control of synchronous motor with permanent magnet and impact of deployment of membership functions of fuzzy controller on a regulation quality of a synchronous permanent magnet motor (PMSM). In the first part of this paper is described mathematical model of synchronous motor with permanent magnets and designed controller by using fuzzy lo...