Electrical generator or motor structure – Dynamoelectric – Linear
Reexamination Certificate
1999-12-23
2001-06-12
Enad, Elvin (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Linear
C310S015000, C310S030000, C318S135000
Reexamination Certificate
active
06246131
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a magnetic power apparatus for use in electromagnetic valves, solenoids, relays, etc., and more particularly to a power-saving, durable magnetic power apparatus, that can be controlled to change the direction of the magnetic path.
The concept of magnetic force is obtained from natural magnets. Natural magnets attract non-magnetized iron chips. The end of a natural magnet, which attracts non-magnetized iron chips, is a magnetic pole. Hans Christian Oersted, a scientist of Denmark, discovered the phenomenon of magnetic force in 1819. Hans Christian Oersted watches the occurrence of a deflection phenomenon when approaching a magnetic needle to an electrically conducted conductor. Later studies indicate the presence of magnetic lines of force in a magnetic field.
FIG. 11
shows the magnetic lines of force pasé from N pole of the magnetic M through the air to C pole of the magnet M.
FIG. 12
shows magnetic lines of force pass from one end of a solenoid C through the air to the opposite end thereof after connection of electric current I to the solenoid C. It is apparent that the magnetic path is a closed path between N pole and S pole. In early 19 century, French scientist Ampere discovered same reason in the formation of the magnetic field of a magnet and the formation of the magnetic field of a solenoid, i.e., the formation of a magnetic field is due to the presence of an electric current on the inside or surface of the magnet. Nowadays, magnetic filed effect has been intensively used in electromagnetic valves, solenoids, relays, etc.
FIG. 13
shows a conventional electromagnetic valve. When the coil
1
C is energized, a magnetic force is produced to attract the iron core
1
F, causing the valve port IV to be opened. This design uses a spring
1
S to keep the iron core
1
F in (the closed) position. The spring force of the spring
1
S offsets a part of the magnetic force of the coil
1
C. This design wastes much electric energy, and the produces much heat during operation. Similar designs are seen in Taiwan Patent Publication No. 319343; 290615; 115728; 268552; 304570; 155433; 222448; 182896; 212501; 241854.
SUMMARY OF THE INVENTION
The present invention provides a magnetic power apparatus, which eliminates the aforesaid drawbacks. It is one object of the present invention to provide a magnetic power apparatus, which eliminates the use of spring means to hold the iron core in position. It is another object of the present invention to provide a magnetic power apparatus, which consumes less electric power. It is still another object of the present invention to provide a magnetic power apparatus, which is inexpensive to manufacture. It is still another object of the present invention to provide a magnetic power apparatus, which is practical for use in solenoids, magnetic valves, and relays. According to one aspect of the present invention, the magnetic power apparatus comprises an outer shell made of magnetically conductive metal, the outer shell having a through hole on one side wall thereof, an iron core axially movably disposed inside the outer shell, a coil positioned in the outer shell around the iron core and controlled to move the iron core axially in the outer shell, a first permanent magnet and a second permanent magnet symmetrically mounted inside the outer shell and axially aligned at two opposite sides of the iron core with same pole aimed against each other, and a driving circuit disposed outside the outer shell and connected with a power output line thereof to the coil to charge a capacitor, the driving circuit outputting to the coil a positive impulse voltage when electrically connected, or a negative impulse voltage when electrically disconnected, causing the iron core to shift the iron core, and causing the first permanent magnet and the second permanent magnet to change magnetic path and to keep the iron core in shifted position. According to another aspect of the present invention, two magnetic guide rings are symmetrically provided between two distal ends of the coil and the first permanent magnet and second permanent magnet to enhance the magnetic force. According to still another aspect of the present invention, a non-magnetically conductive sleeve is mounted inside the outer shell to guide movement of said iron core.
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Dinh Le Dang
Enad Elvin
Rosenberg , Klein & Lee
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