Energy harvester with iron core and at least four magnet portions facing iron core structure and self-powered generation wireless sensor nodes management server

An engine monitoring system using an energy harvester, comprising:

• at least one or more self-power generation wireless sensor nodes for generating electric energy using the energy harvester and monitoring an engine;
• and
• a management server that receives and manages sensing information received from the self-power generation wireless sensor nodes,
• wherein each of the self-power generation wireless sensor nodes comprises:
• at least one or more sensor modules that monitor the engine;
• a data processing unit that identifies and packages sensing information received from the sensor modules;
• a wireless communication unit that wirelessly transmits the packaged sensing information received from the data processing unit to the management server;
• the energy harvester that generates electric energy to be supplied to the sensor modules, the data processing unit, and the wireless communication unit by converting vibration energy of the engine into the electric energy;
• and
• a power management unit that controls the electric energy generated by the energy harvester to supply the electric energy to the sensor modules, the data processing unit, and the wireless communication unit,
• wherein the energy harvester comprises:
• an iron core of a bobbin shape that includes a central shaft, an upper iron core portion formed to extend horizontally from the central shaft, and a lower iron core portion formed to extend horizontally from the central shaft;
• a plurality of magnet portions that is disposed on an inner peripheral surface of a first housing to face an outer peripheral surface of the iron core and is disposed in an extension direction of the central shaft;
• and
• a coil that is wound around the iron core or surrounds the iron core and is disposed along the inner peripheral surface of the first housing between the magnet portions, and
• wherein a state in which the upper and lower iron core portions of the iron core and the magnet portions match each other is adjusted according to a degree of linear vibration of the iron core or the plurality of magnets, and when the upper and lower iron core portions and the magnet portions match each other, a magnetic flux passing through the iron core and the magnet portions forms a closed loop,
• wherein the plurality of magnet portions include first magnet portion to fourth magnet portion spaced apart from each other by a predetermined interval along the extending direction of the central shaft,
• wherein, when the iron core moves to an uppermost end or the plurality of magnets move to a lowermost end according to vertical movement of the iron core or the plurality of magnets, the upper iron core portion and the first magnet portion are disposed to face each other, and the lower iron core portion and the third magnet portion are disposed to face each other, and
• wherein, when the iron core moves to a lowermost end or the plurality of magnets move to the uppermost end according to the vertical movement of the iron core or the plurality of magnets, the upper iron core portion and the second magnet portion are disposed to face each other, and the lower iron core portion and the fourth magnet portion are disposed to face each other.