| 摘要 |
An electricity driven device and method for increasing the rotational inertia of a rotary object or the blade of a lawn mower includes securing an annular fixed element on a non-rotating main shaft. A rotary element (4) has one part extending to a front end of the main shaft (3) to form a coupler (2) which is coupled to the rotary object or the blade (1), while the other part thereof extending around the periphery of the fixed element (5) to increase the rotational inertia of the rotary object (1). A plurality of permanent magnets (51) or coils (41) are arranged around the periphery of the fixed element (5). Correspondingly, a plurality of coils (41) or permanent magnets (51) are arranged at the inner rim of the rotary element (4). When electric currents are supplied to the coils (41), an electromagnetic field is generated between the coils (41) and the permanent magnets (51) to drive the rotary element (4) to bring the coupler (2) and the rotary object (1) to rotate therewith. <IMAGE> |
