| 摘要 |
The invention relates to a transformer including a drum core (1) of a magnetic material with an intermediate central core shaft (4) and a flange portion (5) at each end of the core shaft. An insulated primary wire (2) is wound closest to the central core shaft and an insulated secondary wire (3) is wound on the outside of the primary wire. At least one of the flange portions (5) is provided with an element (12, 15) of an electric insulating material, which element prevents the wires from coming into contact with the peripheral surface of the flange portion when crossing the flange portion radically from the central core shaft. The element can be formed as a peripheral element (12) which at least partially covers an outer peripheral surface of the flange portion. The element can also be formed as a slot-forming element (15) on an inner surface of at least one of the flange portions (5). The slot-forming element (15) comprises two wall portions (15', 15'') between which a slot (16) is defined; and in at least the wall portion (15') , which faces away from the inner surface of the flange portion, a recess is formed extending from the periphery to at least the vicinity of the core shaft (4) to allow wire routing through the slot (16). Preferably the peripheral element (12) and the slot-forming element (15) are combined on a drum core (1) and preferably constitute a single unitary unit. |
