When the number of permanent magnets at the center of the coil was fixed, as the excitation frequency increased from 1 Hz to 10 Hz, the measured output voltage of the PEH showed a trend of first increasing and then decreasing.
1
—
—
When the number of permanent magnets at the center of the coil was fixed, as the excitation frequency increased from 1 Hz to 10 Hz, the measured output voltage of the PEH showed a trend of first increasing and then decreasing.