Sealed contactor
A low cost, sealed contactor comprises a hermetically sealed housing with a flat header having internal components for changing the state of said contactor. Terminals are electrically connected to the internal components for connection to internal circuitry and applying an electrical signal to control the state of the contactor. A solenoid-driven plunger with a hollow shaft is included. Power-reducing electronics located within the hermetically sealed housing are also included. Two contact springs are also included to improve electrical performance. O-rings are added to help seal the contactor and keep it hermetically sealed.
1. A solenoid driven contactor, comprising:
a hermetically sealed housing having internal components for changing the state of said contactor, said housing comprising a cup for holding said internal components, and a header covering said cup with an airtight seal;
terminals electrically connected to said internal components for connection to circuitry and applying an electrical signal to control the state of said contactor; and
power-reducing electronics located inside said hermetically sealed housing;
wherein some of said internal components comprise a first and second contact spring, said first contact spring being preloaded and having a lower spring rate than said second contact spring.
2. The contactor of claim 1 , wherein said sealed housing is filled with a gas to allow for reliable high voltage operation, said hermetically sealed housing substantially impermeable to said gas.
3. The contactor of claim 2 , wherein said gas is hydrogen.
4. The contactor of claim 1 , wherein said header is substantially flat.
5. The contactor of claim 4 , wherein said header is made of ceramic, said ceramic being able to handle high temperature applications.
6. The contactor of claim 1 , wherein one of said internal components comprises a plunger with a hollow shaft, said hollow shaft improving said plunger movement and performance.
7. The contactor of claim 6 , wherein one of said internal components comprises a movable contact attached to said plunger, said movable contact moved by said solenoid.
8. The contactor of claim 7 , wherein some of said internal components comprise stationary contacts, said movable contact and said stationary contacts creating a flow of current when they touch.
9. The contactor of claim 7 , wherein one of said internal components comprises a low power coil for holding said movable contact in place after contactor operation begins.
10. The contactor of claim 1 , wherein one of said internal components comprises a high power starting coil for operating said contactor, said power-reducing electronics controlling the operate time of said starting coil.
11. The contactor of claim 1 , wherein said second contact spring is activated by movement of said solenoid, said second contact spring increasing the electrical performance of the contactor.
12. The contactor of claim 1 , wherein said hermetically sealed housing is sealed using high temperature O-rings.
13. The contactor of claim 1 , wherein said housing further comprises an outer housing shell covering said can and header assembly.