| 摘要 |
The present invention relates to a kind of electromagnet for applications requiring traction, braking, vibration, electromagnetic valve and contactor operations. The electromagnet according to the present invention has new characteristics of temperature rise. A T-shaped solenoidal structure without a heat dissipating window is provided for the body of the electromagnet. Only under high magnetic flux-density close to saturation can the electromagnet sustain holding. Current limiting switching circuits are also provided. The starting current-density of the coil is very high. The starting ampere-turns is higher than the value adopted in conventional designs, and the holding ampere-turns are very low. A normal fuse tube can be reliably adopted for overheat protection. The electromagnet has distinct advantages of excellent working performance (capable of frequent operation and continuous holding); high protection grade; high reliability and high efficiency; long life; very light weight and small size; greatly conserving both copper and iron, and greatly saving cost. In another aspect, a new generation of miniaturized contactors not having a metal seat and capable of switching higher voltages and/or larger currents may be developed accordingly.
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