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Magnetic circuit
About: Magnetic circuit is a research topic. Over the lifetime, 15707 publications have been published within this topic receiving 118099 citations.
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TL;DR: In this article, an optimal solution of a new type of motorcycle brake featuring different smart magnetorheological (MR) fluids was presented, and a hybrid concept of magnetic circuit (using both axial and radial magnetic flux) to generate braking force was analyzed based on the finite element method.
Abstract: This work presents an optimal solution of a new type of motorcycle brake featuring different smart magnetorheological (MR) fluids. In this study, typical types of commercial MR fluid are considered there for the design of a motorcycle MR brake; MRF-122-2ED (low yield stress), MRF-132-DG (medium yield stress) and MRF-140-CG (high yield stress). As a first step, a new configuration featuring a T-shaped drum MR brake is introduced and a hybrid concept of magnetic circuit (using both axial and radial magnetic flux) to generate braking force is analyzed based on the finite element method. An optimal design of the MR brake considering the required braking torque, the temperature due to friction of the MR fluid, the mass of the brake system and all significant geometric dimensions is then performed. For the optimization, the finite element analysis (FEA) is used to achieve principal geometric dimensions of the MR brake. In addition, the size, mass and power consumption of three different MR motorcycle brakes are quantitatively analyzed and compared.
75 citations
Patent•
22 Mar 2002TL;DR: In this article, a permanent magnet type magnetic field generator (10) which can generate a ferro magnetic field of 3T or above in a field generation space (12) is described.
Abstract: A permanent magnet type magnetic field generator (10) which can generate a ferro magnetic field of 3T or above in a field generation space (12). The magnetic field generator (10) has the field generation space (12) located at a central part in the axial direction thereof and comprises a first Haar-Bach type magnetic circuit (14) formed in the center on the outer circumference, and a second magnetic circuit (16) formed to surround the field generation space (12) on the inside of the first magnetic circuit (14). The first magnetic circuit (14) comprises permanent magnets (20a)-(20f), and the central part (A) of permanent magnets (22a)-(22f). The second magnetic circuit (16) comprises a pair of pole pieces (24a, 24b) having saturation magnetization of 1.6T or above, and the central part (B) of permanent magnets (26a)-(26d) for coupling the pair of pole pieces (24a, 24b) magnetically.
74 citations
TL;DR: In this paper, the magnetic gearing principle is extended to the flux-switching permanent magnet (FSPM) motor for its armature winding configuration design, and two new 12/7-pole FSPM motors with the conventional nonoverlapping concentrated and distributed winding are proposed, and the electromagnetic performances of the three motors are analyzed and compared.
Abstract: In this paper, the magnetic gearing principle is extended to the flux-switching permanent magnet (FSPM) motor for its armature winding configuration design. First, the no-load flux density in motor air gap is qualitatively analytically calculated using the equivalent magnetic circuit method, so that the predominant space harmonic components (PSHCs) can be separated. Then, the slot vector graph can be drawn according to the pole-pair numbers and rotation directions of these PSHCs. Consequently, the armature winding configuration of a 12/10-pole FSPM motor is designed based on the slot vector graph using the conventional motor design method. In addition, two new 12/7-pole FSPM motors with the conventional non-overlapping concentrated and distributed winding are proposed, and the electromagnetic performances of the three motors are analyzed and compared. Finally, the analytical results are verified by the finite-element analysis and experimentation.
74 citations
Patent•
22 May 1992
TL;DR: In this article, a plurality of rotors mounted on a rotary shaft to establish a first and a second field magnetic circuits are arranged in parallel with respect to the armature core.
Abstract: An a.c. generator having a stator including an armature core and a polyphase output winding wound around the armature core. A plurality of rotors mounted on a rotary shaft to establish a first and a second field magnetic circuits are arranged in parallel with respect to the armature core. The first field magnetic circuit includes permanent magnets acting as a source of exciting magnetomotive force, while the second field magnetic circuit includes a field winding acting as a source of exciting magnetomotive force. The magnetic fluxes generated from the first and second field magnetic circuits penetrate the armature core inducing an output voltage across the polyphase output winding. The magnetic flux from the second field magnetic circuit is changed so as to increase or decrease the total magnetic flux penetrating the armature core thereby controlling the induced output voltage.
74 citations
TL;DR: The proposed EMAT requires a magnetic circuit configuration that allows omnidirectional SH wave transduction and consists of a pair of ring-type permanent magnets that supply static magnetic fluxes and a specially wound coil that induces eddy currents.
74 citations