Displacement - electricity transducer

A displacement-electricity transducer comprising:

• a fixed magnetic core having a central leg portion and leg portions provided on both sides thereof magnetically coupled to each other;
• a movable magnetic core which is displaced in contact with said central leg portion, so that said magnetic cores are closely coupled at said central leg portion, said movable magnetic core having at least two surface portions with predetermined gaps relative to said leg portions on said both sides, and said movable magnetic core being arranged such that upon displacement thereof the projection area of one of said surface portions onto said leg portion on one of said sides increases, and the projection area of the other of said surface portions onto said leg portion on the other side decreases;
• a first coil which is wound around said central leg portion in said fixed magnetic core;
• at least one second coil which is wound around at least one of both side leg portions;
• and
• an A.C. power source for applying an A.C. voltage to said first coil.

A displacement - electricity transducer comprising:

• a circular-shaped plate of magnetic material;
• a cylindrical shaft of magnetic material extending from the center of one surface of said circular-shaped plate;
• first and second arcuate-shaped wall members extending vertically from respective portions of said one surface of said circular shaped plate, and symmetrically disposed relative to said cylindrical shaft;
• an upper plate member mounted on said shaft for rotation therewith and having respective portions thereof separated from said arcuate-shaped wall members by a prescribed gap therebetween;
• a first coil wound around said cylindrical shaft;
• at least one second coil wound around a respective arcuate-shaped wall member;
• and
• a power source for supplying an A.C. voltage to said first coil.

A displacement - electricity transducer comprising:

• a circular-shaped plate of magnetic material having an aperture through the center of said plate;
• first and second arcuate-shaped wall members of magnetic material extending vertically from respective portions of one surface of said circular-shaped plate and symmetrically disposed relative to said aperture;
• a bearing member fitted into said aperture of said plate;
• a semicircular-shaped plate of magnetic material;
• a cylindrical shaft of magnetic material extending from said semicircular-shaped plate and being received by said bearing member for permitting rotation of said semicircular-shaped plate relative to said first and second wall members while maintaining said semicircular-shaped plate spaced from said wall members by a predetermined gap;
• a first coil wound around said bearing member;
• at least one second coil wound around a respective wall member;
• and
• a power source for supplying an A.C. voltage to said first coil.

A displacement - electricity transducer comprising:

• a circular-shaped plate of magnetic material having an aperture through the center of said plate;
• first and second arcuate-shaped wall members of magnetic material extending vertically from respective portions of one surface of said circular-shaped plate and symmetrically disposed relative to said aperture;
• a cylindrical shaft of magnetic material snugly and rotatably fitting into said aperture;
• a semicircular-shaped plate of magnetic material mounted on one end of said cylindrical shaft so as to be spaced apart from said first and second wall members by a predetermined gap therebetween;
• a first coil wound around said shaft;
• at least one second coil wound around a respective wall member;
• and
• a power source for supplying an A.C. voltage to said first coil.

A displacement - electricity transducer comprising:

• a first plate of magnetic material having an aperture therethrough;
• first and second arcuate-shaped wall members of magnetic material affixed to opposite ends of said first plate in opposite sides of said aperture;
• a cylindrical shaft of magnetic material snugly and rotatably fitting into said aperture;
• a semicircular plate member of magnetic material mounted on one end of said shaft so as to be rotatable relative to said wall members but spaced apart therefrom by a prescribed gap;
• a first coil wound around said shaft;
• at least one second coil wound around at least one respective portion of said first plate;
• and
• a power source for supplying an A.C. voltage to said first coil.

A displacement - electricity transducer comprising:

• a movable magnetic core and a fixed magnetic core which are oppositely arranged so as to have predetermined gaps between at least four oppositely disposed surfaces of said respective magnetic cores, both said magnetic cores forming substantially two pairs of closed magnetic circuits each including one of said gaps and a common magnetic path portion, said magnetic cores being more closely coupled to said common path portion than at said gaps, wherein upon displacement of said movable magnetic core relative to said fixed magnetic core the area of common projection between opposite surfaces of said magnetic cores increases in one of said pairs of magnetic circuits and decreases in the other pair of magnetic circuits;
• a first coil which is wound around the common magnetic path portion of the four closed magnetic circuits;
• second coils which are respectively wound around portions other than said common magnetic path portion, in at least one of said pairs of closed magnetic circuits;
• and
• an A.C. power source for applying an A.C. voltage to said first coil.

A displacement - electricity transducer comprising:

• a circular-shaped plate of magnetic material,
• a plurality of arcuate-shaped wall members of magnetic material extending from the surface of said circular-shaped plate and being angularly equally spaced relative to one another about the center of said plate, each wall member having a relatively narrow circumferential portion extending from the surface of said plate and a relatively wide circumferential portion extending from said relatively narrow circumferential portion;
• a cylindrical shaft member extending from the center of said plate;
• a further plate of magnetic material mounted on one end of said shaft and having a plurality of radially extending arc portions which are angularly equally spaced relative to one another about the axis of said shaft and are rotatably displaceable relative to and spaced apart from the relatively wide circumferential portions of said wall members by a prescribed gap therebetween;
• a first coil wound around said shaft;
• at least one second coil wound around at least one respective wall member;
• and
• an A.C. power source for supplying an A.C. voltage to said first coil.

A displacement - electricity transducer comprising:

• a first magnetic core having two semicircular plates and a supporter for joining said plates at a center of a circular arc thereof and for supporting said plates in parallel formed into a single magnetic core;
• second and third magnetic cores which are arranged so that their pole-faces respectively oppose two parts lying at positions diagonal to each other within a plane surrounded by two straight lines passing through a center of said supporter and by two circular arcs around said center of said supporter and with different radii;
• a supporter which fixedly couples said second and third magnetic cores and which is made of a nonmagnetic material;
• said first to third magnetic cores forming substantially two magnetic circuits each including two gaps;
• and
• first and second coils which are respectively wound around a part common to the two magnetic paths and a part not common thereto;
• said transducer being so constructed that said first magnetic core is rotatable relative to a fourth magnetic core around the center of said first magnetic core and in a manner to maintain the widths of the gaps constant;
• and
• an A.C. supply source for applying a voltage to terminals at both ends of said first coil, while a terminal voltage is derived from said second coil.

A displacement - electricity transducer comprising:

• a movable magnetic core and a fixed magnetic core which are oppositely arranged so as to have predetermined gaps in at least two places therebetween, both said magnetic cores forming substantially two closed magnetic circuits, each circuit including one of said gaps and a common magnetic path, so that upon the displacement of said movable magnetic core relative to said fixed magnetic core, the area of common projection of said magnetic cores having one of said gaps therebetween in one of said closed magnetic circuits increases, while the area of common projection of said magnetic cores having the other of said gaps therebetween in the other closed magnetic circuit decreases;
• a first coil which is wound around the common magnetic path portion of said two closed magnetic circuits;
• at least one second coil which is wound around a portion other than said common magnetic path portion in at least one of said closed magnetic circuits,
• an A.C. power source for applying an A.C. voltage to said first coil;
• and
• wherein a plurality of second coils are respectively wound around portions other than said common magnetic path portion in said two closed magnetic circuits and are connected in series to form an output coil, and wherein the turn ratio between said plurality of second coils is selected to provide an output voltage from said output coil of zero at an arbitrarily predetermined rotational angle of said movable core.

A displacement - electricity transducer comprising:

• a movable magnetic core and a fixed magnetic core which are oppositely arranged so as to have predetermined gaps in at least two places therebetween, both said magnetic cores forming substantially two closed magnetic circuits, each circuit including one of said gaps and a common magnetic path, so that upon the displacement of said movable magnetic core relative to said fixed magnetic core, the area of common projection of said magnetic cores having one of said gaps therebetween in one of said closed magnetic circuits increases, while the area of common projection of said magnetic cores having the other of said gaps therebetween in the other closed magnetic circuit decreases;
• a first coil which is wound around the common magnetic path portion of said two closed magnetic circuits;
• at least one second coil which is wound around a portion other than said common magnetic path portion in at least one of said closed magnetic circuits;
• an A.C. power source for applying an A.C. voltage to said first coil;
• wherein said A.C. power source includes an oscillator having a negative temperature coefficient-resistance element in a feedback path, said oscillator including said first coil, and said negative temperature coefficient-resistance element effecting temperature compensation by varying the feedback ratio of said oscillator in response to a temperature change.

A displacement - electricity transducer comprising:

• a movable magnetic core and a fixed magnetic core which are oppositely arranged with contacting areas so as to form substantially two closed magnetic circuits including a common magnetic path portion, wherein upon displacement of said movable magnetic core relative to said fixed magnetic core, the contact area between said magnetic cores in one of said closed magnetic circuits increases, while the contact area between said magnetic cores in the other closed magnetic circuit decreases;
• a first coil which is wound around the common magnetic path portion of said two closed magnetic circuits;
• at least one second coil which is wound around a portion other than said common magnetic path portion, in at least one of said closed magnetic circuits;
• and
• an A.C. power source for applying an A.C. voltage to said first coil.