Magnetic core

About: Magnetic core is a research topic. Over the lifetime, 30011 publications have been published within this topic receiving 155247 citations.

Nuclear magnetic resonance apparatus

Abstract: A nuclear magnetic resonance apparatus comprises an electromagnetic system in which a shield of a magnetic material is arranged about the coil system for the homogeneous magnetic field. By providing the magnetic material, for example soft iron, directly about the coil system, a comparatively compact magnetic with an intensified, interference-insensitive homogeneous magnetic field is obtained. Instead of using a closed cylinder, use can alternatively be made of a cylinder which is formed by rods. The latter is notably attractive for shielding at a larger distance, the original field in the coil then being influenced to only a minor extent. A similar shielding can be obtained by means of a Helmholtz coil pair.

Inductive coupled wireless power transfer device

Abstract: This invention discloses one sensor couple wireless energy transmission device, which comprises energy emission device, transducer without contact and energy receiver, wherein, the receive comprises integral filter circuit, high frequency inverter circuit and the control circuit to generate proper frequency and impulse width signals; the input work frequency electricity passes filter circuit to generate high voltage direct current for high frequency inverter circuit to change alternating electricity into the transducer initial end; the transducer initial and second magnetic cores are isolated rolled onto relative magnetic core.

Magnetic core structure

Abstract: A circular magnetic core structure comprises a plurality of laminations of prestressed oriented silicon steel secured together near their juxtaposed ends which are biased into mutual engagement and are separable to receive an alternating current carrying conductor to induce into the core alternating magnetic flux which induces alternating current into a coil on the core corresponding to the current in the conductor. The core and coil are encapsulated in insulating material. In one embodiment self curing cement is applied to the juxtaposed ends after the core is applied to the conductor to seal them together. In another embodiment the ends are provided with interlocking separable coupling extensions of corrosion resisting magnetic material.

Tandem field alternator having an improved coil and slip ring connection and method of making the same

Abstract: A tandem Coil armature in which a pair of spaced-apart field coils [91,92] are wound on bobbins [12,14] mounted within a set of magnetic core pieces [16,18,20,22]. Two L-shaped conductors [27,28] pass through passageways through the core pieces and connect the windings to slip-rings [72,74]. Insulated conductor carriers [31,32,37,38] sized to mate with passageways and recesses in the core pieces support the L-shaped conductors and electrically insulate them from the magnetic core piece material. The core pieces are mounted for rotation with the rotor shaft [10] and include interleaved claws at their periphery which form the rotors magnetic poles.

An energy-based design criterion for magnetic microactuators

Abstract: Magnetic actuators can be divided into two types: those in which motion changes the gap separation (type I) and those in which motion changes the gap overlap area but not the gap separation (type II). In conventional magnetic actuators of both types, it is assumed that most of the magnetic energy is stored in the gap due to the large reluctance of the gap compared with the negligibly small reluctance of the magnetic core. However, in magnetic microactuators, the fabrication limitations on the achievable cross-sectional area of the magnetic core as well as the finite core permeability increase the core reluctance to the point that this assumption may no longer be valid. In this case, the magnetic energy is distributed in both the gap and the magnetic core, in which the energy distribution is in proportion to the reluctance of the gap and the reluctance of the core respectively. Using an elementary structure of a magnetic actuator, it is shown that for type I microactuators, when the initial gap of the actuator is fixed (e.g., determining the stroke of the actuator), the generated magnetic force has maximum value when the gap overlap area is designed such that the reluctance of the gap is equal to the reluctance of the magnetic core (i.e., ). For type II actuators, the initial overlap area of the actuator is fixed (determining the stroke); therefore the generated magnetic force has a maximum value when the gap separation is designed such that the above equality holds. This paper details both analytical and finite element method (FEM) analysis confirmation for type I actuators. Extension to type II actuators is straightforward.