Energy conversion device

An energy conversion apparatus for executing conversion from one to another of electrical energy and mechanical energy, comprising:

• a magnet ring, a direction of central axis of which is vertical, the magnet ring including:
• a ring-shaped magnet holder in which a plurality of magnet boxes an upper part of which is opened is formed;
• at least one permanent magnet that is housed in each of the plurality of magnet boxes of the magnet holder, each of the at least one permanent magnet being magnetized along a circumferential direction of the magnet holder;
• a cover that is formed in a ring shape having a width wider than that of the magnet holder, and that is attached to an upper surface of the magnet holder so as to have a same center as that of the magnet holder, and that has an extension part extending in a radial direction of the magnet holder from the magnet holder;
• a gear that is fixed onto the cover and the magnet holder so as to have a same center as those of the magnet holder and the cover, and
• each of an at least one adjacent permanent magnet is arranged in such a manner that both of same polarities face each other in a corresponding magnet holder of the magnet holder, in case that a number of the at least one permanent magnet is plural,
• the energy conversion apparatus further comprising:
• a ring-shaped case, a central axis of which is common with the central axis of the magnet ring, that houses the magnet ring and in which a window part for exposing part of the gear to an outside is formed;
• a plurality of wheels that are arranged between an internal surface of the case and the magnet holder so as to be contacted with a bottom surface of the case and the extension part of the cover;
• a defining member through which each axis of rotation of the plurality of wheels is passed and that defines a relative distance between the plurality of wheels;
• and
• at least one coil that is wound around the case.