| 摘要 |
PROBLEM TO BE SOLVED: To improve an S/N ratio and generate double output, by using tow generation coils of the same shape with a phase difference of π (radian) and entering signals of the generator coils in a differential amplifier. SOLUTION: A first generation coil 1 has a plurality of generation elements 3 at intervals radially along a rotating direction of a generation magnet. The generation elements 3 are formed annularly in a rectangular wave form, while an outer edge and an inner edge of adjoining generation elements are connected with a connection wire 3-1. A second generation coil 2 is provided inside the first generation coil 1 in a way that the second generation coil 2 has a reverse phase to the first generation coil 1. The output of the first and second generation coils 1 and 2 is entered in a differential amplifier to generate a difference between these signals. Then, an output twice the base output voltage can be generated and S/N can be improved, because common-mode noises are canceled each other and eliminated. |
