Abstract
Magnetization reversal in a Wiegand wire induces a pulse voltage in the pickup coil around the wire, called the Wiegand pulse. The Wiegand sensor features the Wiegand wire and the pickup coil. The amplitude and width of the Wiegand pulse are independent of the frequency of the magnetic-field change. The pulse is generated by the Wiegand sensor, which facilitates the use of the Wiegand sensor as a power supply for equipment without batteries. In order to meet the power consumption requirements, it is necessary to maximize the energy of the pulse signal from the Wiegand sensor, without changing the external field conditions. The distributions of the magnetic field generated from the applied magnet in air and in the Wiegand wire were simulated before the experiments. Simulation predicted an increase in the magnetic flux density through the center of the Wiegand wire. This study determined that the magnetic flux density through the center of the Wiegand wire, the position of the pickup coil, and the angle between the Wiegand sensor and the magnetic induction line were the main factors that affected the energy of a Wiegand pulse. The relationship between these factors and the energy of the Wiegand pulse were obtained.
Highlights
The extensive application of wireless monitoring nodes has promoted the effective development and application of the Internet of Things (IoT) [1]
The reason for this result is that the volume of the reversed soft layer increases against the hard core based on the increase in the external excitation magnetic field
The increase in the amplitude and the area of the pulse is attributed to the increase in the volume of the reversed soft layer against the hard core
Summary
The extensive application of wireless monitoring nodes has promoted the effective development and application of the Internet of Things (IoT) [1]. Wireless nodes use a low-power design, the batteries in the wireless monitoring nodes must be replaced periodically due to their limited battery life. This problem can be solved effectively by using self-generating sensors as power supplies in wireless nodes. The self-generation of electricity is called energy harvesting. Because the Wiegand sensor does not require an external power supply, it can output sharp and perfect voltage pulses by changing only the polarity of the applied external magnetic field. The width of the pulse does not depend on the ratio of the change of the applied external magnetic field [4,5,6]
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