Magnetic circuit

About: Magnetic circuit is a research topic. Over the lifetime, 15707 publications have been published within this topic receiving 118099 citations.

An improved coaxial magnetic gear using flux focusing

Abstract: This paper presents a new topology of the coaxial magnetic gear (CMG) in which the permanent magnets (PMs) in the outer rotor are magnetized in tangential direction, hence offering the flux-focusing effect. By using the 2D finite element method, the influence of the main design parameters on the maximum pull-out torque of the proposed magnetic gear is investigated. Also, a quantitative comparison between the proposed topology and the conventional surface-mounted CMG employing radially-magnetized PMs (CMGRM) has been performed and the analysis results indicate that the torque transmission capability of the proposed one can be significantly improved.

Poynting Vector Flow Analysis for Contactless Energy Transfer in Magnetic Systems

Abstract: Most problems related to contactless energy transfer are usually dealt within the framework of transformer theory, employing equivalent electric circuits as a tool for their analysis. Here, however, a physics approach based on the Maxwell equations is followed. Electric and magnetic fields are utilized to evaluate the Poynting vector, which defines the direction and power density carried by the electromagnetic field. The concepts of magnetic voltage and magnetic flux are utilized to define the instantaneous power guided within the magnetic transmitter. Contactless energy transfer requires two separate parts, a transmitter and a receiver circuit. In this paper, we pay attention to the electromagnetic field guided and emitted by the transmitter; internal skin effect (eddy currents losses) is accounted for; electromagnetic energy leaving the transmitter is evaluated using short-dipole antenna theory. This paper does not offer a new practical application of contactless energy transfer. Its scope is rather different; its aim is to provide a fresh look on contactless energy transfer in the context of an electromagnetics framework.

Magnetic drive coupling

Abstract: The driving (30) and driven (32) members of a magnetic drive (20) are separated by an enlarged gap (35) to provide clearance for a conduit (23) or other member. Flux pins (40) in the gap (35) maintain the torque transmitting capability of the drive (20). The spacing between two of the flux pins is increased to provide space for the conduit (23).

Constant flux magneto resistive magnetic reluctance sensing apparatus

Abstract: Disclosed is an improved method and apparatus for sensing magnetic reluctance variations. The invention may be used for magnetic ink character reading, such as is employed on bank checks, or for any of a variety of magnetic reluctance pickup applications. An improved magnetic reluctance sensor head utilizes an essentially U or C-shaped magnetically permeable member having a magnetizing coil encircling it. The coil is arranged to deliver essentially a constant magnetic flux to the U or C-shaped member. The tips of the U or C are placed adjacent to the element whose variation of reluctance is to be detected and a magneto resistive or other similar magnetic sensor is connected in the magnetic circuit either in parallel or in series with the variable reluctance which is to be sensed.