Electromagnet and electromagnetic valve coil assemblies

• US 4,641,118 A
• Filed: 01/30/1985
• Issued: 02/03/1987
• Est. Priority Date: 08/06/1984
• Status: Expired due to Term

• Current Assignee: Hirose Manufacturing Co., Ltd.
• Original Assignee: Hirose Manufacturing Co., Ltd.
• Inventors: Inoue, Ikuo, Hirose, Tokuzo
• Primary Examiner(s): Harris, George
• Application Number:
  US06/696,433
• Time in Patent Office: 734 Days
• Field of Search: 335/255, 335/256, 335/266, 335/268, 335/282, 336/200
• US Class Current: 335/282
• CPC Class Codes: H01F 17/0013 with stacked layers
• CPC Class Codes: H01F 7/1607 Armatures entering the winding

Abstract

An electromagnet including a coil unit having a plurality of electrically insulative substrates, each having a spiral conductor formed thereon, the substrates being stacked together with the spiral conductors parallel with each other. The conductors of the unit are connected in series with each other so that magnetic fluxes formed of electric currents flowing through the conductors are directed in the same direction at the central positions of the spirals of the spiral conductors, and there are formed holes at the central positions for receiving a ferromagnetic core which is moved in response to a direct electric current passed through the coil unit. A valve may be connected to the ferromagnetic core to form an electromagnetic valve assembly.

Claims

1. An electromagnet comprising:

a plurality of first planar insulative substrates, each having a spiral shaped conductor on only one side thereof, each spiral shaped conductor extending in a first direction between a radially inner terminal end and a radially outer terminal end thereof;

a plurality of second planar insulative substrates, each having a spiral shaped conductor on only one side thereof, each spiral shaped conductor extending in a second spiral direction between a radially inner terminal end and a radially outer terminal end thereof, said second spiral direction being a reverse of said first spiral direction;

said plurality of first planar insulative substrates being stacked in alternating relationship with said plurality of second planar insulative substrates, the stack of said plurality of first and second planar insulative substrates having a hole extending centrally therethrough with respect to each spiral shaped conductor;

each of said plurality of first planar insulative substrates having said radially inner terminal end connected to a cylindrical conductor extending therethrough and electrically connected to an abutting radially inner terminal end on a respective one of said plurality of second planar insulative substrates;

each of said plurality of second planar insulative substrates having said radially outer terminal end connected to a cylindrical conductor extending therethrough and electrically connected to an abutting radially outer terminal end on a respective one of said plurality of first planar insulative substrates, whereby each sprial shaped conductor is electrically connected together in series;

a housing having said stack of planar insulative substrates mounted therein; and

a ferromagnetic core slidably received in said hole in said stack of planar insulative substrates, said ferromagnetic core being moved with respect to said stack of planar insulative substrates when a direct electric current is passed through each spiral shaped conductor of said stack of planar insulative substrates.

2. An electromagnetic valve comprising:

a plurality of first planar insulative substrates, each having a spiral shaped conductor on only one side thereof, each spiral shaped conductor extending in a first direction between a radially inner terminal end and a radially outer terminal end thereof;

a plurality of second planar insulative substrates, each having a spiral shaped conductor on only one side thereof, each spiral shaped conductor extending in a second spiral direction between a radially inner terminal end and a radially outer terminal end thereof, said second spiral direction being a reverse of said first spiral direction;

said plurality of first planar insulative substrates being stacked in alternating relationship with said plurality of second planar insulative substrates, the stack of said plurality of first and second planar insulative substrates having a hole extending centrally therethrough with respect to each spiral shaped conductor;

each of said plurality of first planar insulative substrates having said radially inner terminal end connected to a cylindrical conductor extending therethrough and electrically connected to an abutting radially inner terminal end on a respective one of said plurality of second planar insulative substrtes;

each of said plurality of second planar insulative substrates having said radially outer terminal end connected to a cylindrical conductor extending therethrough and electrically connected to an abutting radially outer terminal end on a respective one of said plurality of first planar insulative substrates, whereby each spiral shaped conductor is electrically connected together in series;

a housing having said stack of planar insulative substrates mounted therein; and

a ferromagnetic core slidably received in said hole in said stack of planar insulative substrates, said ferromagnetic core having one end extending from said stack of planar insulative substrates and being moved with respect to said stack of planar insulative substrates when a direct electric current is passed through each spiral shaped conductor of said stack of planar insulative substrates;

a valve casing surrounding said one end of said ferromagnetic core; and

valve means including a valve disposed in said valve casing, said valve means attached to said one end of said ferromagnetic core for opening and closing said valve in response to movement of said ferromagnetic core when direct electric current is passed through each spiral shaped conductor of said stack of planar insulative substrates.

3. An electromagnet comprising:

a coil unit, said coil unit including at least one thin flexible electrically insulative substrate having parallel conductors formed thereon, said thin flexible electrically insulative substrate being formed into a cylindrical shape with first ends of said parallel conductors being connected to second ends of respective adjacent parallel conductors whereby said parallel conductors are electrically connected in series;

a housing having said coil unit mounted therein; and

a ferromagnetic core slidably mounted in said housing with said thin flexible electrically insulative substrate formed into a cylindrical shape surrounding said ferromagnetic core, said ferromagnetic core being moved with respect to said coil unit by passing a direct current through said parallel conductors which are electrically connected in series.

4. The electromagnet of claim 3, comprising a plurality of flexible electrically insulative substrates which are formed into a plurality of coaxial cylindrical shapes to form said coil unit.