Linear induction motor primary member

Claim 2

A linear induction motor primary member having a magnetic core structure adapted for enabling working flux in operation to pass generally transversely of the motor around a primarysecondary magnetic circuit, wherein the core structure is terminated magnetically in the primary-secondary magnetic circuit at transversely spaced ends, the primary member having, for creating the said working flux, a polyphase energising winding comprising a plurality of winding conductors arranged in at least one winding layer, each winding conductor extending generally transversely of the motor in a respective winding layer and having a first part disposed adjacent one said end of the core structure for generating working flux therein and having a second part spaced from the first part and disposed adjacent the other said end of the core structure for generating working flux therein, and energising means for so energising the winding conductors from the phases of a polyphase A.C. supply that in operation the first and second parts of the winding conductors separately create fields of magnetomotive force which travel longitudinally of the primary member at the same speed as one another and which are at least sustantially in antiphase transversely of the primary member.

Claim 3

A primary member according to claim 1, wherein the winding conductors are arranged in two winding layers, the winding conductors of each winding layer having at least one of their ends connected to respective winding conductors of the other winding layer.

Claim 4

A primary member according to claim 1, wherein each said end of the magnetic core structure is formed with core teeth spaced longitudinally of the primary member with winding slots therebetween, the first and second parts of the winding conductors being received in said winding slots of respective ones of the said core structure ends.

Claim 5

A primary member according to claim 1, wherein the magnetic core structure is adapted for providing part of a single primary-secondary magnetic circuit across the width of the motor.

Claim 6

A primary member according to claim 4, wherein the magnetic core structure comprises two first magnetic structures extending longitudinally of the primary member in parallel spaced relationship and each providing one said end of the core structure, and a second magnetic structure extending between the first magnetic structure remote from the two said ends of the core structure so as magnetically to bridge the space between the two first structures.

Claim 7

A primary member according to claim 5, wherein each first magnetic structure comprises a plurAlity of magnetic laminations each orientated longitudinally of the primary member and disposed edge-on to the respective said end of the core structure, and the said second magnetic structure comprises a plurality of magnetic laminations each orientated transversely of the primary member.

Claim 8

A primary member according to claim 1, wherein the magnetic core structure is adapted for providing part of two primary-secondary magnetic circuits side-by-side across the width of the motor.

Claim 9

A primary member according to claim 1, wherein the individual windings and the energising means are so arranged and interconnected that in operation the first part of each winding conductor carries a current which is equal and opposite to the current in the second part of a respective winding conductor of the other winding layer, the said first part and the said second part being substantially aligned transversely of the primary member.

Claim 10

A primary member according to claim 1, wherein the winding conductors are identical, the winding conductors of the two winding layers being inverted as between the winding layers.

Claim 11

A linear induction motor having a primary member and a secondary member arranged transversely of one another for relative longitudinal movement therebetween, said primary member comprising a magnetic core structure and an energising winding associated therewith, said secondary member comprising electrically conductive material, said primary and secondary members being arranged in combination to provide a primary-secondary magnetic circuit for working flux created by said energising winding to pass generally transversely of the motor, said primary member core structure being terminated magnetically in the primary-secondary magnetic circuit at transversely spaced ends, the energising winding comprising a plurality of winding conductors arranged in at least one winding layer, each winding conductor extending generally transversely of the motor in a respective said winding layer and having a first part disposed adjacent one said end of the core structure for generating working flux therein and having a second part spaced from the first part and disposed adjacent the other said end of the core structure for generating working flux therein, and energising means for so energising the winding conductors from the phases of a polyphase A.C. supply that in operation the first and second parts of the conductors separately create fields of magnetomotive force which travel longitudinally of the primary member at the same speed as one another and which are at least substantially in antiphase transversely of the primary member.

Claim 12

A linear induction motor having a primary member and a secondary member arranged transversely of one another for relative longitudinal movement therebetween, said primary member comprising a magnetic core structure and an energising winding associated therewith, said secondary member comprising electrically conductive material, said primary and secondary members being arranged in combination to provide a primary-secondary magnetic circuit for working flux created by said energising winding to pass generally transversely of the motor, said primary member core structure being terminated magnetically in the primary-secondary magnetic circuit at transversely spaced ends, the energising winding comprising a plurality of winding conductors arranged in at least one winding layer, each winding conductor extending generally transversely of the motor in a respective said winding layer and having a first part disposed adjacent one said end of the core structure for generating working flux therein and having a second part spaced from the first part and disposed adjacent the other said end of the core structure for generating working flux therein, and energising means for so energising the winding conductors from the phases of a polyphase A.C. supply that in operation the first and second parts of the conductors separately create fields of magnetomotive force which travel longitudinally of the primary member at the same speed as one another and which are at least substantially in antiphase transversely of the primary member.

Claim 13

A linear induction motor having a primary member and a secondary member arranged transversely of one another for relative longitudinal movement therebetween, said primary member comprising a magnetic core structure and an energising winding associated therewith, said secondary member compoising electrically conductive material, said primary and secondary members being arranged in combination to provide a primary-secondary magnetic circuit for working flux created by said energising winding to pass generally transversely of the motor, said primary member core structure being terminated magnetically in the primary-secondary magnetic circuit at transversely spaced ends, the energising winding comprising a plurality of winding conductors arranged in two winding layers, each winding conductor extending generally transversely of the motor in a respective said winding layer and having a first part disposed adjacent one said end of the core structure for generating working flux therein and having a second part spaced from the first part and disposed adjacent the other said end of the core structure for generating working flux therein, the winding conductors of one winding layer having at least one of their ends connected to respective winding conductors of the other winding layer, and energising means for so energising the winding conductors from the phases oF a polyphase A.C. supply that in operation the first and second parts of the winding conductors separately create fields of magnetomotive force which travel longitudinally of the primary member at the same speed as one another and which are at least substantially in antiphase transversely of the primary member.

Claim 14

A linear induction motor having a primary member and a secondary member arranged transversely of one another for relative longitudinal movement therebetween, said primary member comprising a magnetic core structure and an energising winding associated therewith, said secondary member compoising electrically conductive material, said primary and secondary members being arranged in combination to provide a primary-secondary magnetic circuit for working flux created by said energising winding to pass generally transversely of the motor, said primary member core structure being terminated magnetically in the primary-secondary magnetic circuit at transversely spaced ends, the energising winding comprising a plurality of winding conductors arranged in two winding layers, each winding conductor extending generally transversely of the motor in a respective said winding layer and having a first part disposed adjacent one said end of the core structure for generating working flux therein and having a second part spaced from the first part and disposed adjacent the other said end of the core structure for generating working flux therein, the winding conductors of one winding layer having at least one of their ends connected to respective winding conductors of the other winding layer, and energising means for so energising the winding conductors from the phases oF a polyphase A.C. supply that in operation the first and second parts of the winding conductors separately create fields of magnetomotive force which travel longitudinally of the primary member at the same speed as one another and which are at least substantially in antiphase transversely of the primary member.

Claim 15

A linear induction motor primary member having a magnetic core structure adapted for enabling working flux in operation to pass generally transversely of the motor around a primary-secondary magnetic circuit, wherein the core structure is terminated magnetically in the primary-secondary magnetic circuit at transversely spaced ends, the primary member having, for creating the said working flux, a polyphase energising winding comprising a plurality of winding conductors arranged in two winding layers, each winding conductor extending generally transversely of the motor in a respective said winding layer and having a first part disposed adjacent one said end of the core structure for generating working flux therein and having a second part spaced from the first part and disposed adjacent the other said end of the core structure for generating working flux therein, the winding conductors of one winding layer having at least one of their ends connected to respective winding conductors of the other winding layer, and energising means for so energising the winding conductors from the phases of a polyphase A.C. supply that in operation the first and second parts of the conductors separately create fields of magnetomotive force which travel longitudinally of the primary member at the same speed as one another and which are at least substantially in antiphase transversely of the primary member.

Claim 16

A linear induction motor primary member having a magnetic core structure adapted for enabling working flux in operation to pass generally transversely of the motor around a primary-secondary magnetic circuit, wherein the core structure is terminated magnetically in the primary-secondary magnetic circuit at transversely spaced ends, the primary member having, for creating the said working flux, a polyphase energising winding comprising a plurality of winding conductors arranged in two winding layers, each winding conductor extending generally transversely of the motor in a respective said winding layer and having a first part disposed adjacent one said end of the core structure for generating working flux therein and having a second part spaced from the first part and disposed adjacent the other said end of the core structure for generating working flux therein, the winding conductors of one winding layer having at least one of their ends connected to respective winding conductors of the other winding layer, and energising means for so energising the winding conductors from the phases of a polyphase A.C. supply that in operation the first and second parts of the conductors separately create fields of magnetomotive force which travel longitudinally of the primary member at the same speed as one another and which are at least substantially in antiphase transversely of the primary member.