Textbook for Operation and Maintenance Engineer of Power and Environment Specialty of Data Center - Current and magnetic field server rack China
Textbook for Operation and Maintenance Engineer of Power and Environment Specialty of Data Center - Current and magnetic field server rack China
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There is a magnetic field around the energized wire, and the direction of the magnetic field depends entirely on the direction of the current in the wire. The relationship between the direction of the current and the direction of the magnetic line of force in a straight wire can be determined by the right-hand spiral rule. Keep your thumb straight and four fingers around the wire. When your thumb points to the current direction, the direction of the other four fingers is the direction of the circular magnetic line of force, as shown in Figure 1.3 - 1 (a). Many electrical equipment (such as transformers, motors, relays, etc.) use coils wound by wires.
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When the coil is energized with current, there will be a magnetic line of force inside the coil. The end of the magnetic line of force passing through the coil is the North Pole (N pole) and the end passing through the coil is the South Pole (S pole). The right hand helix rule of the coil can be used to determine the direction. The right hand holds the coil so that the direction of the bent four fingers is consistent with the direction of the current in the coil. Then the direction of the thumb perpendicular to the four fingers is the direction of the magnetic line of force passing through the coil, as shown in Figure 1.3 - 1 (b).
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Textbook for Operation and Maintenance Engineer of Power and Environment Specialty of Data Center - Current and magnetic field server rack China
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