| 摘要 |
<p>The stator 50 of an electric machine 30, e.g. a universal motor, has stator poles 36,38 receiving field windings 32, 34, the poles being distributed asymmetrically along the inner circumference of the stator cross-section 54 so that at least one first region 82 along the stator circumference is designed with a lower density of field windings 32, 34 than in a neighbouring second region 84 i.e. the pole angle 80 is less than 180°. Region 82 has its circumference flattened so as to define an increased gap 66 between the stator and the housing 18, which gap may accommodate the switch actuator 20 and/or electrical/electronic components, fluid/signal lines, and electrical conductors. The pole horns may be of equal length or, as shown, horn 36a,38a may be shorter than 36b,38b. The stator may comprise two mirror image parts divided along line 68 at 70, 70a or may be comprise three sections fig3c. The present stator allows for the hand grip section of a power tool e.g. a grinder, to be of reduced cross section.</p> |
