| 摘要 |
<p>The ferromagnetic core contains two U-shaped sections (1, 3) with their limbs (5, 7) directed towards each other. One pair of limbs directed towards each other (5,7) is surrounded by a coil former (9) made of an electrically insulating material, on the inner surface of which is located a projecting element (13) at right angles to the longitudinal direction of the limbs, which projecting element extends between the ends of the limbs surrounded by the coil former and determines the width of an airgap (15) between those ends. The ends of the other set of limbs pointing towards each other (5,7) are placed directly one against the other. </p> |
