Jonathan Z. Bird

Bio: Jonathan Z. Bird is an academic researcher from Portland State University. The author has contributed to research in topics: Magnet & Rotor (electric). The author has an hindex of 18, co-authored 87 publications receiving 913 citations. Previous affiliations of Jonathan Z. Bird include General Motors & University of North Carolina at Charlotte.

A Flux Focusing Axial Magnetic Gear

Abstract: This paper investigates a novel axial magnetic gear using ferrite magnets. In order to increase the air-gap flux density the ferrite magnets are arranged in flux focusing configuration. The simulation results presented in this paper indicate that a relatively high torque density can be achieved when using only ferrite magnets.

Experimental Evaluation of Low-Speed Flux-Focusing Magnetic Gearboxes

Abstract: Experimental results are presented for three different low-speed flux-focusing magnetic gearboxes. The performance of the magnetic gearbox is compared when utilizing ferrite and NdFeB and also a hybrid design, in which ferrite magnets are used in the inner rotor and NdFeB magnets are used in the outer rotor. The peak torque and efficiency are measured. It is shown that the NdFeB magnetic gearbox has an active torque density of 151 Nm/L.

A 3-D Magnetic Charge Finite-Element Model of an Electrodynamic Wheel

Abstract: When a magnetic rotor is both rotated and translationally moved above a conductive, nonmagnetic, guideway eddy currents are induced that can simultaneously create lift, thrust, and lateral forces. In order to model these forces, a 3D finite-element model with a magnetic charge boundary has been created. The modeling of the rotational motion of magnets by using a fictitious complex magnetic charge boundary enables fast and accurate steady-state techniques to be used. The conductive regions have been modeled using the magnetic vector potential and nonconducting with the magnetic scalar potential. The steady-state model has been validated by comparing it with a Magsoft Flux 3D transient model (without translational velocity) and with experimental results. The 3D model is also compared with a previously presented 2D steady-state complex current sheet model.

Performance of a magnetic gear using ferrite magnets for low speed ocean power generation

Abstract: A magnetic gear offers many advantages over its mechanical counterpart such as contact free torque production, no gear lubrication and inherent overload protection. However, current magnetic gear designs use large quantities of rare-earth magnet material and unfortunately the high cost of rare-earth material makes the magnetic gear uncompetitive with alternative technology. This paper investigates a low-cost magnetic gear using ferrite magnets. The ferrite magnets are arranged in a spoke-type arrangement. A novel mortise and tenon joint method is used to construct the magnetic gear. The gear is design for a very low speed ocean generation application

The Performance of a Transverse Flux Magnetic Gear

Abstract: This paper investigates a novel transverse flux magnetic gear using ferrite and NdFeB magnets. The transverse flux magnetic gear topology offers the advantage of a simpler mechanical construction. In order to increase the air-gap flux density the magnets are arranged in flux focusing configuration. The performance when using soft magnetic composite material is also compared.

Introduction To Electrodynamics

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Design of loosely coupled inductive power transfer systems

Abstract: The model of inductive power system is set up,and how to choose the compensation topology and resonant frequency is analyzed.According to the analysis result,the model of inductive power system is set up,and the impact of the power transfer due to the variety of load is analyzed.

Permanent magnet type rotating electric machine

Abstract: This permanent magnet type rotating electric machine suppresses an increase in the magnetizing current during demagnetization and during magnetization, and enables variable speed operation over a wide range from low speed to high speed with high output. A rotor (1) is comprised of a rotor core (2), a variable magnetic force magnet (3), and a fixed magnetic force magnet (4). The variable magnetic force magnet (3) and a fixed magnetic force magnet (4a) overlap in the magnetization direction thereof to form a magnet series. This magnet series is disposed within the rotor core (2) at a position whereby the direction of magnetization is in the direction of axis d. On either side of the magnetic series of the variable magnetic force magnet (3) and the fixed magnetic force magnet (4a), fixed magnetic force magnets (4b, 4b) are disposed at a position whereby the direction of magnetization is in the direction of axis d. When the interlinkage magnetic flux of the variable magnetic force magnet (3) is reduced, a magnetic field is activated in the reverse direction of the magnetization direction of the variable magnetic force magnet (3) by means of the armature winding current. When the interlinkage magnetic flux of the variable magnetic force magnet (3) is increased, a magnetic field is activated in the same direction as the magnetization direction of the magnet by means of the armature winding current.

Emerging Electric Machines and Drives — An Overview

Abstract: With the increasing concerns on more electricity or full electricity for modern energy conversion systems, the key component of electric machine, has been paid more and more attention for the development of the new topologies and advanced drives. In the meantime, the emerging machines and drives show the increasing merits for the modern industrial needs. This paper investigates the latest developments and challenges of electric machines and drives. The key is to discuss and explore the machine topologies, structures, characteristics, operation principles, control strategies, and new applications. Thus, the developing trends and opportunities of the new electric machines and drives can be revealed for modern potential applications.