Abstract: [Problem] To allow for an increase in the output of an energy conversion device having a plurality of permanent magnets arranged in a ring shape. [Solution] A cover (3) is attached to a ring-shaped magnet holder (2) in which permanent magnets (1) are housed. An extended portion of the cover (3) is supported by a wheel (6). The wheel (6) is in contact with the extended portion of the cover (3) and the bottom surface of a case (5). Thereby, the magnet holder (2) can be rotated lightly even when the weight of the magnet holder (2) increases with the increase in the number of the permanent magnets (1) housed in the magnet holder (2). Thus, an energy conversion device (100) can produce more energy from the energy supplied, and thereby enhance the output.

Abstract: [Problem] To allow for an increase in the output of an energy conversion device having a plurality of permanent magnets arranged in a ring shape. [Solution] A cover (3) is attached to a ring-shaped magnet holder (2) in which permanent magnets (1) are housed. An extended portion of the cover (3) is supported by a wheel (6). The wheel (6) is in contact with the extended portion of the cover (3) and the bottom surface of a case (5). Thereby, the magnet holder (2) can be rotated lightly even when the weight of the magnet holder (2) increases with the increase in the number of the permanent magnets (1) housed in the magnet holder (2). Thus, an energy conversion device (100) can produce more energy from the energy supplied, and thereby enhance the output.