They used mutual inductance between two equivalent coils to calculate the force between the two magnets 8. Then, they calculated the magnetic field using the potential theory. They used the equivalent of a magnet with a current-carrying coil to calculate the magnetic force. calculated the force between two permanent coaxial magnets. In design optimization, the effect of geometric parameters such as length and radius of coils and magnet was investigated 7. In this design, they calculated the total magnetic field using the Biot-Savart law. designed and optimized an electromagnetic soft actuator based on a coil with a permanent magnet core. The calculations in this study were performed by equating its electric current by fictitious magnetization 6. Ciric calculated the magnetic field within a transformer using the magnetic scalar potential method. The space of the coiled coil was considered to be completely homogeneous in these calculations, a constant permeability was considered for the whole space 2. calculated the magnetic field from a bobbin and coil using the magnetic field vector potential method. calculated the force between two coaxial coils using the filament method as an efficient numerical method 5. calculated the magnetic force between a thin cylindrical coil and a coaxial cylindrical magnet by deriving the mutual inductance between them 4, while A.
Derived directly from the well-known Maxwell's equations 2, the equivalent magnetic charge model and equivalent magnetizing current are widely used to obtain, either analytically or numerically, the magnetic field and magnetic force of permanent magnets 3. Generation of controlled magnetic fields has many applications, including spacecraft, magnetic resonance imaging, bioelectromagnetic research, and nondestructive testing (NDT). Some devices, such as sensors, actuators, and speakers, are built with magnets, coils, or both 1.Įlectromagnetic coils are very important in modern medical and electrical sensors and systems. However, some devices, such as magnetic couplings, are made of permanent cylindrical magnets, while others, such as transformers, are made of coils.
Magnetic devices used in electrical engineering require magnets or coils.
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