Abstract The magnetic structure of the proposed variable period undulator consists cylindrical magnets. Each magnet can be rotated by a small stepper motor, in order to adjust field and form an arbitrarily shaped profile on-axis. Meanwhile, short prototype exists, equipped with scalable control system drive large amount motors. This paper describes details implementation, results tests on diffe...

Removing the gearbox from single-motor configuration of an electric vehicle (EV) would improve motor-to-wheel efficiency by preventing mechanical losses, thus extending autonomy EV. To this end, a permanent-magnet Vernier machine (PMVM) is designed to ensure such operation. This avoids high volume and large pole-pair number armature winding since its operating principle resembles that synchrono...

A new permanent magnet design for axial flux interior permanent magnet (AFIPM) motor is described in this paper. Poleshoes are traditionally used to produce sinusoidal flux linkage and sinusoidal EMF especially in the case of radial flux synchronous machines. Poleshoes are not a practical solution in the case of axial flux PM machine. The use of poleshoes in the production of sinusoidal back EM...

In this paper we use the Fourier transform (FT) to model and simulate the 3-D magnetic field created by finite, planar permanent magnet arrays that are Fourier-transformable and possess vertical magnetization. This approach captures the three dimensional characteristic of the fields, including the field components near the ends of the array. These end effects are important in small-scale precis...

The inhomogeneous magnetic field of a permanent-magnet planar Halbach array is used to either deflect or to specularly reflect a supersonic beam of neutral atoms. Metastable neon and helium beams are tested to experimentally evaluate the performance of this array in a range of configurations. Results are compared with numerical simulations and the device is presented as a high precision tool fo...

In a Magnets puzzle, one must pack magnets in a box subject to polarity and numeric constraints. We show that deciding solvability of Magnets instances is NP-complete.

Molecular clusters of paramagnetic 3d transition metals continue to be a major research area because of their fascinating physical properties and their complex structures. In particular, they often have high-spin ground states and easy-axis-type magnetic anisotropy, giving a significant energy barrier to reversal of the magnetization vector. Thus, at sufficiently low temperatures they function ...