Overview
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Inductive power supply system is a device which transmits power by electromagnetic
induction without physical contact. The system can be used for various
applications, such as moving devices, rotating devices, and devices placed
in closed space. Since the primary side and the secondary side do not contact,
magnetic flux leakage and efficiency vary with the position of the two.
Therefore, it is important to evaluate how their positions affect each
characteristic by simulation.
This note presents the use of magnetic field analysis to obtain the power
transmission efficiency by moving the position of power cable in horizontal
direction and in vertical direction. |
Vertical Distance versus Power Transmission Efficiency
| Figure 1 shows the magnetic flux lines generated when the power cable is
moved vertically. Figure 2 shows the power transmission efficiency. When
the distance between the power cable and the core becomes larger, the flux
leakage increases but the flux linkage of the secondary coil decreases.
As a result, the power transmission efficiency is reduced. |
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Horizontal Distance - Characteristics of Power Transmission Efficiency
| Figure 3 shows the magnetic flux lines generated when the power cable is
moved horizontally. Figure 4 shows the power transmission efficiency. If
the power cable is moved horizontally from the initial position, the magnetic
flux in the core is imbalanced at the sides due to the distance. The flux
linkage of the secondary coil changes little, and so does the power transmission
efficiency. |
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