B and other magnetic poles These magnetic potential equations represent a set of equipotential surfaces of a magnetic pole and may also be referred to as equipotential surface equations. The shape of the magnetic pole we need can be selected from the set of equipotential surfaces represented by the equation of equal magnetic potential surface. To more easily determine the shape of the pole, the equipotential surface equation (4) can be rewritten as: Where r 0 is the minimum distance from the origin of the coordinate to the magnetic pole and can be used as a parameter when designing the magnetic pole. As can be seen from the 4 formula, in the straight line packaging boxes clothing Xing Hua Printing Factory , https://www.xinghuaprint.com
Fig. 3(a) is a schematic view showing the shape of such a magnetic field equipotential surface. However, if a magnetic pole is manufactured in accordance with this shape, three sets of coils are required. However, in practice, only a portion of the gap between the equipotential surfaces is used, so that the magnetic field properties can be utilized to simplify the magnetic pole. Therefore, for equipotential planes I, II and straight lines A space between it, and with a 0P to 0M boundary, the magnetic potential φ = 0 in the wedge block of iron [Figure 120 ° opening angle 3 (b) instead of equipotential surfaces when Ⅲ, the spatial distribution of the magnetic field is constant . Therefore, the equipotential surfaces I and II can be used as the surface of a pair of magnetic poles, and a wedge-shaped iron block with OP and OM as a boundary is formed to form a new magnetic pole system, as shown in Fig. 3(b). In the space around it, the magnetic field will be the same as the same spatial magnetic field in Figure 3(a). The wedge-shaped iron block is also called a zero magnetic pole or a neutral magnetic pole. Of course, the actual magnetic pole is not likely to extend to infinity, but only the finite part is selected according to the need. Therefore, if the intercepted part is too short, the magnetic field property will deviate greatly from the theoretical result.