Slightly increasing the distance between the coils improves the uniformity at the coils plane but decreases it in the center. The resultant field at P is found by integrating dB along the entire length of the solenoid. This calculator is currently a beta version and is intended only for reference. The magnetic field dB due to the current dI in dy can be found with the help of Equation 12.5.3 and Equation 12.7.1: (12.7.2)dB 0R2dI 2(y2 +R2)3/2 j (0IR2N 2L j) where we used Equation 12.7.1 to replace dI. While K&J Magnetics offers diametrically magnetized magnets, this calculator does not apply to them. Both coils are then powered by an equal current flowing in the same direction.īy setting the distance between the two coils to the radius of the coils, R, the magnetic field uniformity in the center area between the coils is maximized but the field strength at the plane of the coils is around 7% lower. This calculator only considers discs and cylinders that are magnetized along the cylindrical axis. The basic set-up consists of two coils that are separated from each other by a specific distance, for circular coils this is the same as the radius of the coils. A Helmholtz Coil is a set-up of coils, normally two per axis, that creates a near uniform magnetic field between them.
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