Abstract
This paper presents an air-gap magnetic field manipulation by optimized coil currents for a magnetic force enhancement in electromechanical devices. The external coil is designed near the device air-gap for manipulating the magnetic field distribution. The distribution of external coil currents is then optimized for maximizing the magnetic force in the tangential direction to the air-gap line. For the optimization, the design domain near air-gap is divided into small areas, and design variables are assigned at each small design area. The design variables determines not only the strength of coil current density (i.e., number of coil turns) but also whether the material state is coil or iron. In a benchmark actuator example, it is shown that 11.12% force enhancement is available by manipulating the air-gap magnetic field distribution using the optimized coil current. By investigating the magnetic field distribution, it is confirmed that the optimized coil current manipulated the magnetic field, forwarding a focused and inclined distribution that is an ideal distribution for maximizing the magnetic force.
Highlights
Electromechanical devices, such as electromagnetic actuators and electric motors, are one of the main components for automobiles, aerospace, and robotics applications
The design domain near air-gap was divided into small areas, and the design variables were assigned
The design variables determined the number of coil turns and whether optimization, the design domain near air-gap was divided into small areas, and the design variables the material state was coil or iron
Summary
Electromechanical devices, such as electromagnetic actuators and electric motors, are one of the main components for automobiles, aerospace, and robotics applications. In [26], the active control of the magnetic field was implemented using multiple electromagnets In these previous works [23,24,25,26], the active manipulation of the magnetic field distribution using the external current was theoretically studied and experimentally validated for wireless power transfer, magnetic field communication, and biomedical imaging applications. This work aims to present the magnetic field manipulation using external coil currents for enhancing the magnetic force in a tangential direction to the air-gap line. By solving the optimization problem, the best possible coil current distribution that maximizes the tangential direction magnetic force by the manipulated magnetic field could be determined.
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