Compensated reciprocating electrodynamic machine

Claim 2

An electrodynamic machine comprising: a magnetic circuit having an axially polarized constant flux source and axially spaced wound stator poles with slots and tooth tips which simultaneously confront the axially spaced poles of an axially movable flux conducting armature through an air gap; and means establishing low resistance current paths in each of said armature poles operative to cancel alternating flux in said armature poles.

Claim 3

The electrodynamic machine recited in claim 1 wherein said low resistance current paths comprise short-circuited coil means disposed in each of said armature poles.

Claim 4

In a linear electrodynamic machine of the type comprising a magnetic circuit having an axially polarized constant flux source, a stator member including axially spaced wound poles each having a slot and tooth tips, and a flux conducting armature member of magnetizable material supported for axial movement within said stator member and having axially spaced poles which simultaneously confront said stator pole teeth through an air gap, the combination with said magnetic circuit of: a. means for maintaining the air gap flux density and the direct current ampere turns of said magnetic circuit constant regardless of the position of said armature along the axis of said stator; and b. means carried by said armature poles establishing low resistance current paths therein operative to cancel alternatinG flux in said armature poles.

Claim 5

In a linear electrodynamic machine of the type comprising a magnetic circuit having an axially polarized constant flux source, a stator member including axially spaced wound poles each having a slot and tooth tips, and a flux conducting armature member of magnetizable material supported for axial movement within said stator member and having axially spaced poles which simultaneously confront said stator pole teeth through an air gap, the combination with said magnetic circuit of: a. means for maintaining the air gap flux density and the direct current ampere turns of said magnetic circuit constant regardless of the position of said armature along the axis of said stator; and b. means carried by said armature poles establishing low resistance current paths therein operative to cancel alternatinG flux in said armature poles.

Claim 6

The linear electrodynamic machine recited in claim 3 wherein said means for maintaining constant air gap flux density and direct current ampere turns comprises providing the total air gap area of each armature pole equal to the area of its facing stator pole tooth tip.

Claim 7

The linear electrodynamic machine recited in claim 3 wherein said low resistance current paths comprise short-circuited coils carried by the armature poles.

Claim 8

The linear electrodynamic machine recited in claim 5 wherein said means for maintaining constant air gap flux density and direct current ampere turns comprises providing the total air gap area of each armature pole equal to the area of its facing stator pole tooth tip.

Claim 9

The linear electrodynamic machine recited in claim 3 wherein said constant flux in said magnetic circuit is produced by a direct current energized axially polarized electromagnet carried by said stator member and said opposite alternating currents in said stator slots are produced by coils carried by said stator poles and energizable from an alternating current source.

Claim 10

The linear electrodynamic machine recited in claim 3 wherein said constant flux is produced by axially polarized permanent magnet means and said opposite alternating currents in said stator slots are produced by coils carried by said stator poles and energizable from an alternating current source.

Claim 11

The linear electrodynamic machine recited in claim 8 wherein said axially polarized permanent magnet means is carried by said stator.

Claim 12

The linear electrodynamic machine recited in claim 8 wherein said axially polarized permanent magnet means is carried by said armature.

Claim 13

The linear electrodynamic machine recited in claim 4 wherein said constant flux in said magnetic circuit is produced by a direct current energized axially polarized electromagnet carried by said stator member and said opposite alternating currents in said stator slots are produced by coils carried by said stator poles and energizable from an alternating current source.

Claim 14

The linear electrodynamic machine recited in claim 4 wherein said constant flux is produced by axially polarized permanent magnet means and said opposite alternating currents in said stator slots are produced by coils carried by said stator poles and energizable from an alternating current source.

Claim 15

The linear electrodynamic machine recited in claim 12 wherein said axially polarized permanent magnet means is carried by said stator.

Claim 16

The linear electrodynamic machine recited in claim 12 wherein said axially polarized permanent magnet means is carried by said armature.

Claim 17

The linear electrodynamic machine recited in claim 5 wherein said constant flux in said magnetic circuit is produced by a direct current energized axially polarized electromagnet carried by said stator member and said opposite alternating currents in said stator slots are produced by coils carried by said stator poles and energizable from an alternating current source.

Claim 18

The linear electrodynamic machine recited in claim 5 wherein said constant flux is produced by axially polarized permanent magnet means and said opposite alternating currents in said stator slots are produced by coils carried by said stator poles and energizable from an alternating current source.

Claim 19

The linear electrodynamic machine recited in claim 16 wherein said axially polarized permanent magnet means is carried by said stator.

Claim 20

The linear electrodynamic machine recited in claim 16 wherein said axially polarized permanent magnet means is carried by said armature.

Claim 21

The linear electrodynamic machine recited in claim 6 wherein said constant flux in said magnetic circuit is produced by a direct current energized axially polarized electromagnet carried by said stator member and said opposite alternating currents in said stator slots are produced by coils carried by said stator poles and energizable from an alternating current source.

Claim 22

The linear electrodynamic machine recited in claim 6 wherein said constant flux in said magnetic circuit is produced by axially polarized permanent magnet means and said opposite alternating currents in said stator slots are produced by coils carried by said stator poles and energizable from an alternating current source.

Claim 23

The linear electrodynamic machine recited in claim 20 wherein said axially polarized permanent magnet means is carried by said stator.

Claim 24

The linear electrodynamic machine recited in claim 20 wherein said axially polarized permanent magnet means is carried by said armature.

Claim 25

A linear electrodynamic machine comprising: a. A stator member including axially spaced-apart poles each having a slot and overhung tooth tips; b. Means for alternately oppositely magnetizing said stator poles; c. A flux conducting armature member of magnetizable material supported for axial movement within said stator, said armature including a body portion with poles at opposite ends thereof extending toward said stator tooth tips and spaced slightly therefrom to define an air gap therebetween, the centerlines of said armature poles being spaced apart a distance equal to the spacing between the center lines of said stator poles and the air gap area of each armature pole being equal to the air gap area of a stator tooth tip; d. Means producing an axially polarized constant flux in the magnetic circuit established by said stator and said armature members and wherein said flux crosses said air gap from one stator pole to a facing pole at one end of said armature thence axially through said body portion and returns across said air gap from the pole at the opposite end of said armature and through the other stator pole; and e. Means carried by said armature poles establishing low resistance current paths therein operative to cancel alternating flux in said armature poles.

Claim 26

A linear electrodynamic machine comprising: a. A stator member including axially spaced-apart poles each having a slot and overhung tooth tips; b. Means for alternately oppositely magnetizing said stator poles; c. A flux conducting armature member of magnetizable material supported for axial movement within said stator, said armature including a body portion with poles at opposite ends thereof extending toward said stator tooth tips and spaced slightly therefrom to define an air gap therebetween, the centerlines of said armature poles being spaced apart a distance equal to the spacing between the center lines of said stator poles and the air gap area of each armature pole being equal to the air gap area of a stator tooth tip; d. Means producing an axially polarized constant flux in the magnetic circuit established by said stator and said armature members and wherein said flux crosses said air gap from one stator pole to a facing pole at one end of said armature thence axially through said body portion and returns across said air gap from the pole at the opposite end of said armature and through the other stator pole; and e. Means carried by said armature poles establishing low resistance current paths therein operative to cancel alternating flux in said armature poles.

Claim 27

The linear electrodynamic machine recited in claim 23 wherein said low resistance current paths comprise short-circuited coils disposed in said armature poles.

Claim 28

The linear electrodynamic machine recited in claim 23 wherein said means for alternately oppositely magnetizing said stator poles comprises differentially connected coils carried by said stator poles and energizable from an alternating current source.

Claim 29

The linear electrodynamic machine recited in claim 25 wherein said low resistance current paths comprise short-circuited coils disposed in said armature poles.