| 摘要 |
<p>PURPOSE:To cause the inductance of primary coil to be equal to a predetermined value by press-deforming non-magnetic material having plasticity disposed on a part of closed magnetic path in a magnetic core. CONSTITUTION:A transformer 1 is secured to a fixed plate 25. A magnetic body 5 is vibrated by a thrusting bar 26 in an air cylinder 32, and a non-magnetic body 24 is subject to deformation. At this juncture, since a coil disposed within a coil block 2 is connected to a lead wire 28, the inductance of primary coil is measured by a measuring instrument 29. The output of the instrument 29 is applied to a comparator 30 and then compared with a reference voltage. If the output voltage reaches the reference value, it generates an output signal to actuate an air cylinder control device 31 to stop the operation of the air cylinder 32, thus enabling the inductance of primary coil to be set equal to a predetermined value.</p> |
