| 摘要 |
PURPOSE:To make an electromagnetic relay smoothly operable with a simple structure by installing an auxiliary coil, which is smaller in resistance than a main coil, wound in the same direction as the main coil, and connected to the main coil in parallel and, when being impressed with the rated voltage, it is burned out and intercepted from the main coil, in an electromagnet. CONSTITUTION:An auxiliary coil 46, which is extremely fewer in the number of turns and smaller in resistance than a main coil 44, is branched off from this main coil 44 and wound on an iron core 42 in the same direction as the main coil 44, then it is connected to a relay terminal 48 via a fuse 47. At time of initial action after ultrasonic cleaning, if rated voltage is impressed in space between coil terminals 12 and 12', since an electromagnet 40 becomes plenty of the number of turns as much as a portion for the auxiliary coil 46, such a magnetic field that is high in magnetic flux density is securable as compared with the case of the main coil 44 alone. With this constitution, such an electromagnetic relay as capable of doing its operation easily is produced.
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