| 摘要 |
<p>A linear electromagnetic machine (5) has a stator (40) with a coil (12a, 12b) mounted thereon. A reciprocating element (10) has permanent magnet segments (70a-e) of alternating polarity so that reciprocation of said element (10) relative to said stator in an axial direction causes periodic flux reversal through the coil to induce an alternating voltage therein. The magnetized segments (70a-e) are of equal axial extent and are axially spaced by transitional regions that are of axial extent substantially less than that of the magnetized segments. Flux return elements (57a-b) and core elements (48a-b) associated with the stator provide a relatively low reluctance magnetic path for flux lines resulting from magnetization of the permanent magnets wherein the reluctance is generally independent of the position of the reciprocating element. The preferred coil includes a generally Z-shaped coil conductor having parallel strip portions (120, 120') which are offset by a distance slightly greater than the strip width. The strip portions are joined at a central stepped portion (121) and are formed at their remote ends with respective connection tabs (122, 122'). The central stepped portion (121) defines the radially innermost portion of the coil and the two strip portions extending away therefrom are wound in opposite directions on a cylindrical mandrel surface.</p> |
