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Outline
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Principle of the Alternator
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| 1. |
Three-phase alternating current
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| (1) |
When a magnet rotates within a coil, a voltage will be created between both ends of the coil. This will give rise to an alternating current. |
| (2) |
The relation between the current generated in the coil and the position of the magnet is as shown in the figure on the left. The greatest amount of current is generated when the N and S poles of the magnet are closest to the coil. However, the current flows in opposite directions with each half turn of the magnet. As the magnet rotates, the current forms a sine wave and this is called a "single phase alternating current". The change over 360°, as shown in the figure, is referred to as one cycle, and the number of cycles occurring in one second is called frequency (Hz). |
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(5)
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