Abstract:
Divergent flux path magnetic actuation is a technique employed to move and magnetically hold an armature in electromechanical actuator devices. These actuators are typically used for linear and reciprocating application with a shaft firmly fixed to an armature or central pole piece to convey movement and forces. By incorporating a bearing about the shaft, rotation can also be conveyed. Further these actuators are more adaptable to energy saving applications than conventional solenoids, specifically when their control coils are parallel connected to reduce the input voltage from a power source and electrically pulsed from a capacitor to reduce the energy input. Thus divergent flux path magnetic actuators can be used for multipurpose energy saving applications and adapted to a variety of devices that would commonly use conventional solenoids.

Description:
RELATED APPLICATIONS 
       [0001]    Applications related to the foregoing applications include U.S. patent application entitled “PERMANENT MAGNET LATCHING SOLENOID,” having U.S. Pat. No. 6,265,956 B1, date Jul. 24, 2001; J.P. Patent entitled “SOLENOID ACTUATOR,” having U.S. Pat. No. 7,037,461, date 1995; U.S. Patent entitled “LATCHING SOLENOID WITH MANUAL OVERRIDE,” having U.S. Pat. No. 5,365,210, date Nov. 15, 1994; U.S. Patent entitled “ELECTROMAGNETIC DEVICE,” having U.S. Pat. No. 3,381,181, date Apr. 30, 1968; U.S. Patent entitled “VARIABLE LIFT OPERATION OF BISTABLE ELECTROMECHANICAL POPPET VALVE ACTUATOR,” having U.S. Pat. No. 4,829,947, date May 16, 1989, U.S. patent application entitled “SOLENOID OPERATED VALVE WITH MAGNETIC LATCH,” having U.S. Pat. No. 3,814,376, date Jun. 4, 1974; U.S. Patent entitled “DUAL POSITION LATCHING SOLENOID,” having U.S. Pat. No. 3,022,450, date Feb 20, 1962, the disclosures are hereby incorporated by reference. 
       FIELD OF THE INVENTION 
       [0002]    The present invention relates generally to the multipurpose use of divergent flux path magnetic actuators, examples include U.S. Pat. Nos. 3,022,450; 3,381,181; 5,365,210; 6,265,956 B1; 7,037,461, wherein the magnetic flux from a toroid or ring shaped radially poled permanent magnet with extended and bi-directional coaxial poles is directionally induced to divert its paths by control coils placed about the movable center pole or armature in order to magnetically attract the armature to closed pole ends of a magnetic body that typically comprises the outer housing for the purpose of producing mechanical linear or reciprocating force on attached devices through a shaft firmly fixed to the armature, and further shown here to transmit rotational force to attached devices through a shaft and bearing that is allow to move in the armature. 
       BACKGROUND OF THE INVENTION 
       [0003]    Divergent flux path magnetic actuation is a technique employed to move and magnetically hold an armature in electromechanical devices including some valves. The permanent magnets are employed in a manner that places their magnetic field in a bi-stable state to allow control coils to divert the magnetic field in one of two directions within the surrounding magnetic material. Examples of bi-stable permanent magnet actuators include U.S. Pat. Nos. 3,022,450; 3,381,181; 5,365,210; 6,265,956 B1; 7,037,461, each having a magnetic body incasing the permanent magnet, two controls coils, and moveable central pole piece or armature with the control coils placed one on either side of the permanent magnet and about the central pole piece. The control coils are connected to a power source and form a single current directional path to produce a single directional path magnetic field to divert the permanent magnet&#39;s magnetic field in one of two directions from the permanent magnet to bi-directionally attract the movable central pole piece to the fixed pole ends of the magnetic body as done in U.S. Pat. Nos. 3,022,450; 3,381,181; 5,365,210; 7,037,461; 6,265,956 B1. 
       SUMMARY OF THE INVENTION 
       [0004]    Divergent flux path magnetic actuators are: 
         [0005]    Typically used for linear and reciprocating application with a shaft firmly fixed to the armature or central pole piece to convey movement and forces. By incorporating a bearing about the shaft, rotation can also be conveyed. It is then an object of the present invention to produce a divergent flux path magnetic actuator that can convey rotational motion. 
         [0006]    More adaptable to energy saving applications than conventional solenoids, specifically when their control coils are parallel connected to reduce the input voltage from a power source and electrically pulsed from a capacitor to reduce the energy input. It is then an object of the present invention to show multipurpose energy saving applications for divergent flux path magnetic actuators adapted to a variety of devices that would commonly use conventional solenoids. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0007]    For a better understanding of the present invention, reference may be made to the accompanying drawings in which: 
           [0008]      FIG. 1  is a perspective view of one embodiment of a divergent flux path magnetic actuator with one end removed for clarity; 
           [0009]      FIGS. 2-3  are cross-sectional views of a divergent flux path magnetic actuator showing the different latching positions and showing the bi-directional magnetic flux paths; 
           [0010]      FIGS. 4-5  show the parallel connection of the control coils in a divergent flux path magnetic actuator to reduce the voltage from the power source. 
           [0011]      FIG. 6  shows one of many H-bridge designs that are uniquely capable for energizing the control coils in the present invention. 
           [0012]      FIG. 7  shows one method of charging a capacitor to voltages greater than 9V, providing the power source for current discharged through the H-bridge of  FIG. 6 . 
           [0013]      FIGS. 8-10  are current traces.  FIG. 8  illustrates the current trace for a conventional solenoid actuator. 
           [0014]      FIGS. 9-10  are current traces from two different versions of a divergent flux path magnetic actuator using the same capacitor/voltage setup and the method of  FIGS. 4-7 , where  FIG. 9  shows an ideal current trace for minimum energy use and  FIG. 10  shows that the capacitor/voltage setup was over designed for the versions of the divergent flux path magnetic actuator used. 
           [0015]      FIGS. 11-12  show two divergent flux path magnetic actuators of  FIG. 2-3  back to back to increase the actuation length and with a spring to help movement against any force from an attached device. 
           [0016]      FIGS. 13-14  are cross-sectional views of  FIGS. 2-3  showing one method of a divergent flux path magnetic actuator modified for use with a magnetic shaft. 
           [0017]      FIGS. 15-16  are cross-sectional views of  FIGS. 13-14  showing how a divergent flux path magnetic actuator can be modified for use in a spline shaft to disengage two rotating shafts. 
           [0018]      FIGS. 17-18  show a representative spline shaft mating pattern for use in  FIGS. 15-16 . 
           [0019]      FIGS. 19-22  show a divergent flux path magnetic actuator modified for a sealed or isolation systems.  FIGS. 19-20  are cross-sectional views of  FIGS. 2-3  showing how a divergent flux path magnetic actuator can be modified for use in a sealed or isolation system.  FIGS. 21-22  show the two isolated pieces of the present invention of  FIGS. 19-20  for better prospective view. 
           [0020]      FIGS. 23-26  show a divergent flux path magnetic actuator used in a valve.  FIGS. 23-24  are cross-sectional views of  FIGS. 2-3  showing one method of a divergent flux path magnetic actuator for use in a valve.  FIGS. 25-26  are cross-sectional views of  FIGS. 19-22  showing one method of a divergent flux path magnetic actuator for use in a sealed valve. 
           [0021]      FIGS. 27-28  are cross-sectional views of  FIGS. 2-3  showing one method of a divergent flux path magnetic actuator for use in a pump. 
           [0022]      FIGS. 29-30  are cross-sectional views of  FIGS. 2-3  showing one method of a divergent flux path magnetic actuator for use in a relay or switch. 
           [0023]      FIGS. 31-32  are cross-sectional views of  FIGS. 2-3  showing one method of a divergent flux path magnetic actuator for use in a pulse tube cryo-cooler. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0024]    Referring now to the drawings,  FIGS. 1-3  are provided to facilitate an understanding of the various aspects or features of a divergent flux path magnetic actuator. It is understood that multiple magnetic strength, shape and size divergent flux path actuators  10  are attainable using different magnetic strength, shape and size radial poled permanent magnets  2  with design suited for the modified devices as used throughout this specification. The radially poled permanent magnet  2  may be composed of any desirable permanent magnet material and may include radial extensions to the coaxial poles  1  and  6  using magnetic materials giving the desirable magnetic field and force characteristics needed for a given application. Multiple shapes and sizes of the radially poled permanent magnet  2  are attainable using different shape and size permanent magnets as toroid, square, rectangle or other geometric shapes that can be either one piece or composed of multiple pieces. Regardless of the shape and size radially poled permanent magnet  2 , the radial poling direction of the permanent magnet is perpendicular to the cylindrical length, which can be either: north outward—south inward or south outward—north inward from a defined center of the permanent magnet. Poling parallel to the cylindrical length will not produce the desired results. The preferred poling direction as used throughout this specification is north inward as it produces the highest magnetic force given by the direction of the dark arrows. 
         [0025]      FIGS. 1-3  depict the cylindrical form of a divergent flux path magnetic actuator as used throughout this specification.  FIG. 1  has attractor la removed for clarity.  FIGS. 2-3  show the two positions of the armature  6  and non-magnetic shaft  7 . In  FIGS. 1-3 , the permanent magnet  2  has a flat toroid shape and is poled radially with north inward of the toroid (dark arrow). 
         [0026]    In  FIGS. 1-3 , the divergent flux path magnetic actuator  10  has a magnetic enclosure or housing  1  with firmly attached closed ends or attractors la and lb perpendicular to the length, and contains: 
         [0027]    (a) A firmly fixed toroid or ring shaped radially poled permanent magnet  2  having concentric magnet pole faces, 
         [0028]    (b) A firmly fixed pair of control coils  3  and  4  wound adjacent and on either side of the radially poled permanent magnet  2 , wired to form a single solenoid like control coil with the same directional magnetic flux when energized, 
         [0029]    (c) A thin non-magnetic tube  5  through the radially poled permanent magnet  2  and the control coils  3  and  4  extending between or through the attractors  1   a  and  1   b  of the magnetic housing  1 , 
         [0030]    (d) A magnetic armature  6 , inside the non-magnetic tube  5 , shorter than the distance between the attractors  1   a  and  1   b  to produce an air gap when against one of the attractors and free to move parallel to its length between the attractors  1   a  and  1   b , and 
         [0031]    (e) A shaft  7  centered inside and through the length of the armature  6  as not to degrade the function of the armature  6 , preferably non-magnetic or designed to minimize the flux leakage between the permanent magnet  2  and the attractors  1   a  and  1   b , extending through one or both of the attractors  1   a  and  1   b  of the magnetic housing  1 , and can take on many different designs for transmitting linear, reciprocating or rotational forces. 
         [0032]    In  FIGS. 1-3 , as used throughout this specification, 
         [0033]    (a) The size of the air gap between an attractor  1   a  or  1   b  and one end of the armature  6  is a function of the design requirements of the magnetic actuator  10  needed for the application used, 
         [0034]    (b) The maximum latching force attainable is a function of the permanent magnet&#39;s magnetic residual flux density (Br), magnetic flux leakage from the magnetic housing  1  and armature  6 , and the facing areas of the armature  6  and an attractors  1   a  or  1   b,    
         [0035]    (c) The magnetic housing  1  and the armature  6 , regardless of the shape or size, the preferably formed of soft iron, steel or some other magnetic material, with the preferred material being one which provides low reluctance, exhibits low hysterisis, and has a high magnetic flux density capability; likewise could be of laminate type construction. 
         [0036]    (d) The method to firmly fix the permanent magnet  2 , and control coils  3  and  4  inside the magnetic housing  1  and about the tube  5  can be through any means that does not take away from the functionality of the present invention. 
         [0037]    (e) The leakage magnetic flux from the various components is disregarded for simplicity, but may need to be understood in various designs using the present invention. 
         [0038]    As illustrated in  FIG. 2 , under no power to the control coils  3  and  4 , the armature  6  is magnetically latched to the attractor  1   a  with the least air gap, whereby the magnetic flux (arrows) follows a radial path through the permanent magnet  2 , bi-directionally through the armature  6  with the majority of the magnetic flux (solid arrows) in one direction through the attractor  1   a  and with the residual magnetic flux (dash arrow) being in the other direction through attractor  1   b . In each direction, the magnetic flux (arrows) follows a path through the housing  1  back to the permanent magnet  2 . 
         [0039]    In reference to  FIGS. 2-3 , upon application of the proper power to the control coils  3  and  4  to reverse the direction of the primary magnetic flux from the permanent magnet  2  toward the attractor  1   b , the armature  6  become more attracted to the attractor  1   b  moving toward attractor  1   b  to close the air gap. 
         [0040]    As illustrated in  FIG. 3 , under no power to the control coils  3  and  4 , the armature  6  is magnetically latched to the attractor  1   b  now having the least air gap, whereby the magnetic flux (arrows) follows a radial path through the permanent magnet  2 , bi-directionally through the armature  6  with the majority of the magnetic flux (solid arrows) in one direction through the attractor  1   b  and with the residual magnetic flux (dash arrow) being in the other direction through attractor  1   a . In each direction, the magnetic flux (arrows) follows a path through the housing  1  back to the permanent magnet  2 . 
       Control of the Coils 
       [0041]      FIG. 4-5  shows the preferred parallel connection of the control coils  3  and  4 , as used throughout this specification, to an alternating voltage/current source, where the arrow indicates the direction of the current through the coils when the switch is closed. It is understood that series connection can also be made, but will increase the total circuit resistance, requiring a higher voltage for a given pair of coils. In  FIG. 4-5 , the number of turns and the resistances of the control coils  3  and  4  are the same. The switching of the control coils voltage to reverse the current direction can be done with mechanical switches, relays or using various ICs or other methods as desired. 
         [0042]      FIG. 6  shows one of many H-bridge designs, which is the preferred circuit to alternately energize the control coils pair  3  and  4  in a pulsed timed sequential manner to produce linear or bi-linear magnetic force between the armature  6  and the attractors la and lb to form a magnetic actuator for various applications. Connection of the control coils pairs  3  and  4  (represented by the word “Coils”) as shown in  FIG. 6  allows single directionality of the magnetic flux in the armature  6  by applying a voltage to either “Input  1 ” or “Input  2 ” per standard H-bridge designs, which will energize the control coil pairs  3  and  4  in like current direction. 
         [0043]    In  FIG. 6 , the Hi-bridge is defined by the TIP 36C/35C ICs with an Applied Voltage and ground (GND). The diodes D1-D4 are for back emf protection. For the TIP 36C/35C ICs, the resistors R1 and R2 are approximately 270 ohms. The TIP-120 ICs are used as they can be controlled with a 5V TTL signal from a computer for ease in operation. The resisters R3 and R4 may not be needed for a TTL signal from a computer, but may for direct connection to a voltage source. The inputs (1 and 2), Resisters (R3 and R4) and the TIP-120 ICs can be replaced with other types of switching methods provided they are pulsed in the proper manner as not to degrade the operation of the present invention. 
         [0044]    In reference to  FIGS. 2-3  and  FIG. 6 , when the proper voltage/current is applied to the proper input, either “Input 1” or “Input 2”, the permanent magnet-magnetic flux (solid arrows) is diverted through the armature  6  as defined by the direction of the magnetic flux (solid arrows) produced by the control coil pairs  3  and  4 ; reversing the voltage/current directions in sequence produces the opposite effect. For a given force, wire size, and number of coil turns, the pulsing time required to unlatch and attract the armature  6  to an attractor la or lb has been shown to decrease with increasing applied voltage. It has also been shown that increasing the voltage also allows for increased air gap distances. This allows for the development of divergent flux path electromagnets and magnetic actuators having variable reaction times and air gap distances with applied voltage. 
         [0045]      FIG. 7  shows one of many low power capacitor charging circuits that can provide an impulse current through the H-bridge of  FIG. 6  in order to reduce the energy input to the control coils pairs  3  and  4  providing for a highly energy efficient magnetic actuator. Per the MAX1044 data sheet, each voltage multiplier circuit produces 17V on capacitor “C1”, 25V on capacitor “C2” and 33V on capacitor “C3”. The series connection as shown between the two MAX1044 voltage multiplier circuits with independent 9V sources produced approximately 60V on capacitor “C4” during testing. Increased charging voltage can be achieved by series addition of more MAX1044 voltage multiplier circuits. Although adequate, the MAX1044 voltage multiplier circuit may be slow for some applications. For faster pulse rates, direct connection of the H-bridge to the power source or another type of faster charging voltage multiplier circuits should be used. 
       Energy Efficient 
       [0046]      FIG. 8  illustrates the current trace for conventional magnetic actuators. When a DC voltage is impressed across the control coil, the current will rise to point (a), where the armature motion occurs as represented by the downward current to point (b), then the current moves along trace (c) to a “Steady State Current.” For a given conventional magnetic actuator, the rise time to point (a) is dependent upon the load, duty cycle, input power, stroke, and temperature range. This time delay, which occurs prior to the armature motion, is a function of the inductance and resistance of the coil, and the magnetic flux required to move the plunger. 
         [0047]      FIGS. 9-10  are current traces from two different versions of the present invention using the same capacitor/voltage setup and the method of  FIGS. 6-7 , where  FIG. 9  shows an ideal current trace for minimum energy usage and  FIG. 10  shows that the capacitor/voltage setup was over designed for the version of the present invention used. In comparison to  FIG. 8 , the current traces,  FIGS. 9-10 , do not show a “Steady State Current” as once magnetically latched and the capacitor is discharged no more power is required. The absent of the “Steady State Current” represents a power savings over prior art. Dissipation of the energy from a capacitor then provides for a highly energy efficient replacement over the prior art of conventional electromagnets and magnetic actuators having a steady state current. The use of the over designed capacitor as shown in  FIG. 10  may be required for systems with varying load, duty cycle, motion distance, input power, or temperature range. 
         [0048]    It is noted that the smaller controls used in the present invention, decreases the time delay, which occurs prior to the armature motion. The time delay can be decreased further by increasing the voltage. 
       Additional Force Mechanism 
       [0049]    A divergent flux path magnetic actuator can be enhanced for greater linear motion distance, output force or increased electrical efficiency through the adaptation of other force mechanisms that do not require electrical power. Additional force mechanisms are demonstrate in  FIGS. 11-12 , where springs are used to aid in the motion of the actuators and, in  FIGS. 27-28 , where the input fluid/gas pressure aid in compressing the output fluid/gas, noting other non-electrical force mechanisms and methods can be used to enhance efficiency. 
       Length Extension 
       [0050]      FIGS. 11-12  use two magnetic actuators  10 L and  1 OR (mirrored for ease of numbering) of  FIGS. 2-3  to double the extension length of the shaft  7 . In  FIGS. 11-12 , a spring  8  and a magnetic spacer  9  are placed between the two magnetic actuators  10 L and  10 R. The armatures  6 L and  6 R are recessed to center the spring  8  and to help the magnetic flux to reverse versa moving toward the center of the armatures  6 L and  6 R due to the absents of the non-magnet shafts  7   a  and  7   b  extruding outward to the spring  8 . The non-magnetic tube  5 L and  5 R extends through the attractors  1 bL and  1 bR. Unlike the portion of the attractors  1 bL and  1 bR that would be inside the non-magnetic tube  5 L and  5 R in like to  FIGS. 19-20 , there is none. Instead the armatures  6 L and  6 R magnetically latch to the magnetic spacer  9  with some leakage to the attractors  1 bL and  1 bR. Under no power to the control coils  3 L- 4 L and  3 R- 4 R, the armatures  6 L and  6 R will remain magnetically latched to the attractors  1 aL- 1 aR or  1 bL- 1 bR with the least air gap, for example, attractor  1 aL- 1 aR in  FIG. 11  and attractor  1 bL- 1 bR in  FIG. 12 . Directionally is controlled by energizing the control coils  3 L- 4 L and  3 R- 4 R in the proper manner to divert the flux in the armatures  6 L and  6 R toward the direction of the attractors  1 aL- 1 aR or  1 bL- 1 bR. In  FIGS. 12 , the arrow at the ends of the shafts  7   a  and  7   b  indicate the movement distance of the shafts  7   a  and  7   b.  The purpose of the spring  8  is to provide some coordination between the movement of the two armatures  6 L and  6 R and to give a quicker response time by overcoming any residual magnetic force quicker than without it. 
       SHAFT DESIGN MODIFICATIONS 
       [0051]      FIGS. 13-20  are presented to show various shaft designs. It is understood that other shaft design are possible. 
       Magnetic Shaft 
       [0052]      FIGS. 13-14  are cross-sectional views of the magnetic actuators  10  of  FIGS. 2-3  showing one modification method for use with a magnetic shaft  7 . In  FIG. 13-14 , a magnetic shaft  7  is surrounded and firmly attached to a non-magnetic material  7   a,  which is surrounded and firmly attached to the armature  6 . The thickness of the non-magnetic material  7   a,  about the magnetic shaft  7  is such to minimize the leakage of magnetic flux from the armature  6 . As with  FIGS. 2-3 , under no power to the control coils  3  and  4  the armature  6  will remain magnetically latched to the attractor  1   a  or  1   b  with the least air gap, for example, attractor  1   a  in  FIG. 13  and attractor  1   b  in  FIG. 14 . Provide the non-magnetic material  7   a  and the magnetic shaft  7  is firmly attached to each other and the armature  6 ; they will move and latch accordingly. 
       Rotating Shaft 
       [0053]      FIGS. 15-16  are cross-sectional views of the magnetic actuators  10  of  FIGS. 3-14  showing one modification method for use to unite or disengage two rotating spline shafts  7 L and  7 R. In  FIGS. 15-16 , a bearing assembly  7   a  is placed inside and firmly attached to the armature  6 . As with  FIGS. 2-3 , under no power to the control coils  3  and  4  the armature  6  will remain magnetically latched to the attractors  1   a  or  1   b  with the least air gap, for example, attractor  1   a  in  FIG. 15  and attractor  1   b  in  FIG. 16 . Provided the bearing assembly  7   a  is firmly attached the armature  6 , they will move and latch together, accordingly. The center bore of the bearing assembly  7   a  is splined in like to  FIG. 17  and matched with  FIG. 18 . In  FIG. 15 , two spline matched shafts  7 L and  7 R in like to  FIG. 18  are placed in the bearing assembly  7   a.  The two spline matched shafts  7 L and  7 R are attached (not shown) in a way that does not let them move with respect to the movement of the bearing assembly  7   a.  In  FIGS. 15-16 , the separation between the bearing assembly  7   a  and the shafts  7 L and  7 R to the attractors la or lb can be made wide enough to increase the magnetic flux resistance, such that the bearing assembly  7   a  and shaft  7 L and  7 R can be made from either non-magnetic or magnetic materials without reducing the holding force on the armature  6 . The armature  6  may require a mechanism to keep it from rotating. 
         [0054]      FIGS. 17-18  are reference spline ( FIG. 17 ) and shaft ( FIG. 18 ) teeth patterns, where the shape and number of teeth are design dependent. It is understood that: 
         [0055]    a. The teeth pattern in  FIG. 17  is though the center bore of the bearing  7   a  and the teeth pattern length in 
         [0056]      FIG. 18  on the shafts  7 L and  7 R only needed to be long enough to inner the center bore of the bearing  7   a  to the appropriate functional length, and 
         [0057]    b. The magnetic actuators  10  is firmly attract to both of the devices containing the shafts  7 L and  7 R, and that one device provides the proper function for producing rotational force and the other device provides the proper function for transferring the rotational force as needed. 
       Isolated Shaft 
       [0058]      FIGS. 19-20  are modified versions of the magnetic actuator  10  of  FIGS. 2-3  where pressure, fluid or other mediums could inner the present invention and need to be isolated by separating the magnetic actuator  10  into two isolated pieces, a main body  10 - 1  and a post  10 - 2 .  FIGS. 21-22  show the two isolated pieces, main body  10 - 1  and post  10 - 2 , of the magnetic actuator  10  of  FIGS. 19-20  for better prospective view, where the main body  10 - 1  is composed of the major portion of the housing  1 , the control coils  3  and  4 , and the permanent magnet  2  and where the post  10 - 2  is composed of the tube  5 , armature  6 , shaft  7 , and portions of the attractors la and lb. It is understood that the tube  5  is non-magnetic and thin enough to allow the required magnetic flux from the permanent magnet  2  to cross it without functionally impairing the present invention. 
         [0059]    In  FIGS. 19-20 , the tube  5  extends through the housing  1  with portions of the attractors  1   a  and  1   b  inside and firmly attached to the tube  5 , spaced equally with the ends of the housing  1  forming the other portion of the attractors  1   a  and  1   b . In  FIGS. 19 ,  20  and  22 , the armature  6  is recessed opposite the shaft  7 , but it is preferred that the shaft  7  extend through the armature  6 . The recess is shown to provide for a non-magnetic spring or force mechanism (not shown) to help aid in the motion or delatching, if needed. It is understood that another spring or force mechanism could be use on the opposite side of the armature  6  and on either side of the attractor  1   a.    
         [0060]    In  FIGS. 19-22 , the tube  5  is closed and sealed about a portion of the attractor  1   b  and the shaft  7  is firmly attached to the armature  6  from one end and extends only through the portion of attractor  1   a . By extending the shaft  7  side of the tube  5  into a pressure, fluid or other medium chamber/vessel with proper sealing, isolation from the main body  10 - 1  is achieved similar to the way conventional magnetic actuators are isolated. Under no power to the control coils  3  and  4 , the armature  6  will remain magnetically latched to the portions of the attractor  1   a  or  1   b  with the least air gap, for example, attractor  1   a  in  FIG. 19  and attractor  1   b  in  FIG. 20 . In  FIGS. 20 , the arrow at the end of the shaft  7  indicates the movement distance of the shaft  7 . 
       INCORPORATING DEVICES 
     Flow Valve 
       [0061]      FIGS. 23-24  show a simple flow valve incorporating the magnetic actuator  10  of  FIGS. 2-3  connected to a flow body  20 , where  FIG. 23  shows the valve stem  12  closed against the valve seat area  13  and  FIG. 24  shows the valve stem  12  open or lifted off the valve seat area  13  due to the movement of the valve stem or shaft  7  of the magnetic actuator  10 . In  FIGS. 23-24 , the flow valve is appropriately designed with a flow body  11  of a given material for gas or liquid flow and incorporates: an in and out flow path as indicated by the (In and Out) arrows, a value stem  12 , a valve seat area  13  with pressure seal  14   a  connected to the valve stem seat  12  to create a firm seal when closed, as shown in  FIG. 22 , and a pressure/leak seal  14   b  between the flow body  11  and magnetic actuator  10  to create a firm pressure/leak seal when connected. As used in  FIGS. 23-24 , the valve stem seat  12 , regardless of the shape, size or material composition, is firmly connected to the shaft  7  of the magnetic actuator  10 , passing through the housing  1  of the magnetic actuator  10  and into the flow body  11 . In  FIGS. 23-24 , the darker arrows represent flow/pressure and the dash arrow representing no-flow. 
         [0062]      FIGS. 25-26  shows the isolation magnetic actuator of  FIGS. 19-20  used with the flow valve body  20  with the respective parts of  FIGS. 23-24  and defined above, where isolation of pressure, fluid or other mediums is needed. In  FIGS. 25-26  the main body  10 - 1  is placed about the post  10 - 2  and one end of the post  10 - 2  is attached to the valve body  20  and sealed with an appropriate sealing method  14   b.  The valve operation is the same as defined above for  FIGS. 23-24 . 
       Pump 
       [0063]      FIGS. 27-28  show a simple pump incorporating the magnetic actuator  10  of  FIGS. 2-3  to illustrate reciprocating motion. The magnetic actuator  10  through the housing  1  is connected to the pump  30   a  and  30   b  through the pump housing  31   a  and  31   b  and pressure sealed using O-rings  35   a  and  35   b.  The pump housings  31   a  and  31   b,  flow paths  15  with input check valves  16   a,    16   b,    16   c  and  16   d  and output check valves  17   a,    17   b,    17   c  and  17   d,  connection members  33   a  and  33   b,  and pistons  32   a  and  32   b  with seals  34   a  and  34   b  are appropriately designed for gas or liquid flow. The connection members  33   a  and  33   b , regardless of the shape, size or material composition, is connected to the shaft  7  of the magnetic actuator  10 . 
         [0064]      FIG. 27  shows the pistons  32   a  and  32   b  moving to the right and  FIG. 28  shows the pistons  32   a  and  32   b  moving to the left. 
         [0065]    In  FIGS. 27-28 , it is understood that: 
         [0066]    (a) The dark arrows at the in and out positions represent in and out flow, 
         [0067]    (b) Flow through the input check valves  16   a,    16   b,    16   c  and  16   d,  and output check valves  17   a,    17   b,    17   c  and  17   d  are indicated by bold arrows and restricted or non-flow is indicated by the dashed arrow, 
         [0068]    (c) The flow through the input check valves  16   a,    16   b,    16   c  and  16   d,  and output check valves  17   a,    17   b ,  17   c  and  17   d  are defined by the pressure in the flow paths  15  with respect to the deferential produced across a check valve by the pistons  32   a  and  32   b,  and 
         [0069]    (d) Regardless of the directional motion of the shaft  7  of the magnetic actuator  10 , in and out flow is in the same direction with higher output pressure than the input pressure due to the pumping action during operation. 
       Electrical Relay 
       [0070]      FIGS. 29-30  show a simple electrical relay incorporating the magnetic actuator  10  of  FIGS. 2-3  to illustrate utility for remote operation of devices in similar manner The magnetic actuator  10  is firmly connected through the housing  1  to a non-electrical conductive relay housing  18  containing input terminals  20   a  and  21   a,  intermediate terminals  20   b  and  21   b,  output terminals  20   c  and  21   c,  non-electrically conductive plate  19 , connection wires  23   a  and  23   b  and contacts  22   a - 1 ,  22   a - 2 ,  22   b - 1  and  22   b - 2 . Connection terminals  20   b  and  21   b  are mounted on the non-electrically conductive plate  19  and connection wire  23   a  electrically connects input terminals  20   a  and intermediate terminals  20   b,  and connection wire  23   b  electrically connects input terminals  21   a  and intermediate terminals  21   b  to allow movement of the plate  19 . The plate  19  is connected firmly to the shaft  7  of the magnetic actuator  10 . 
         [0071]      FIG. 29  shows the relay open with no contact between the contacts  22   a - 1  and  22   a - 2  and no contact between the contacts  22   b - 1  and  22   b - 2 , allowing no current path between the input terminals  20   a  and  21   a  and output terminals  20   c  and  21   c,  respectfully. 
         [0072]      FIG. 30  shows the relay closed with contact between the contacts  22   a - 1  and  22   a - 2  and contact between the contacts  22   b - 1  and  22   b - 2 , allowing a current path between the input terminals  20   a  and  21   a  and output terminals  20   c  and  21   c,  respectfully. 
       Pulse Tube Cryo-Cooler 
       [0073]      FIGS. 31-32  show the magnetic actuator  10  of  FIGS. 2-3  attached to the pump  30  to compress a gas through a simple pulsed tube refrigerator (examples are: U.S. Pat. No. 3,237,421, U.S. Pat. No. 3,817,044, U.S. Pat. No. 5,295,355, U.S. Pat. No. 7,131,276). The pulsed tube refrigerator incorporates flow paths  15  with input check valves  17   a  and  17   d  and return put check valves  16   a  and  16   b  from the pump  30  to the regenerator  24  and pulse tube  26 . The regenerator  24  and pulse tube  26  are connected to the cold head  25  having a flow path between them. The check valves  16   a,    16   b,    17   a  and  17   b  open/closed in a proper order to allow flow from the pump  30  and into the regenerator  24 , cold head  25  and pulse tube  26  in a single direction, regardless of the direction of the electrical power applied to the magnetic actuator  10 .  FIG. 31  shows the piston  33  moving to the right and  FIG. 32  shows the piston  33  moving to the left. As used in  FIGS. 31 and 32 , it is understood that the pump  30  operates like the pumps  30   a  and  30   b  in  FIGS. 27-28 .