Electromagnetic device for converting mechanical energy into electrical energy

An electromagnetic device for converting input mechanical energy into output electrical energy, comprising:

• a movable element that is able to make a vibratory mechanical movement,
• a vibration source configured to actuate the vibratory mechanical movement of the movable element,
• a coil,
• a magnetic circuit passing through said coil, said coil being configured to generate the output electrical energy when said movable element is making its vibratory mechanical movement,
• a permanent magnet arranged in the magnetic circuit and able to generate a magnetic flux, referred to as the total magnetic flux, in the magnetic circuit,
• wherein:
• the magnetic circuit comprises a first gap and a second gap,
• said first gap remaining substantially constant and said second gap being variable as a function of the position taken by the movable element during its vibratory mechanical movement,
• the permanent magnet is arranged in the magnetic circuit so that the total magnetic flux splits into a first magnetic flux through a first portion of the magnetic circuit comprising the constant gap and a second magnetic flux through a second portion of the magnetic circuit comprising the variable gap,
• the coil is passed through by a single portion of the magnetic circuit, which portion is chosen from the first portion of the magnetic circuit and the second portion of the magnetic circuit, and wherein
• the ratio between the first magnetic flux and the second magnetic flux varies as a function of the position of the movable element.