MULTI-LAYER POLYPHASE WINDING MEMBER AND TRANSFORMER

• US 3,668,587 A
• Filed: 05/13/1970
• Issued: 06/06/1972
• Est. Priority Date: 05/13/1970
• Status: Expired due to Term

• Current Assignee: Vincent F. Foster
• Original Assignee: Vincent F. Foster
• Inventors: Foster, Vincent F.
• Primary Examiner(s): Kozma, Thomas J.
• Application Number:
  US05/036,913
• Time in Patent Office: 755 Days
• Field of Search: 336/115,119,120,122,123,129
• US Class Current: 336/123
• CPC Class Codes: H01F 29/12 having movable coil, winding, or part thereof; having movable shield

Abstract

Disclosed is a polyphase member for a position measuring transformer formed by multiple layers of printed circuit active and inactive conductors. The inactive conductors connect the active conductors to form winding sections and the winding sections are interconnected by printed circuit inactive conductors to form polyphase windings. Each layer includes groups of conductors including a predetermined number, usually an equal number, of active conductors of first and of second cofunction, e.g., sine or cosine, types. The winding sections are positioned with a specific phase relationship, such as quadrature, to a reference winding. The active conductors on each layer of the polyphase member are positioned such that a blank area called an active conductor void or gap, occurs where normally in a periodic configuration an active conductor would be positioned. Still further, the layers are complementary in that they are combined into a multi-layer member so that the active conductors on one layer are superposed the active conductor voids or gaps on another layer whereby the multi-layers as a whole present to the reference winding uniformly spaced active conductors.

Claims

1. A position measuring device comprising, a first relatively movable member including first and second layers of cofunction windings wherein each layer includes a substantially equal number of active conductors forming winding sections of first and of second cofunction types, wherein each layer includes winding sections separated by winding section voids, said voids in each layer being characterized by the absence of active conductors, and wherein said first layer is superposed over said second layer so that each winding section on each layer is superposed with a corresponding winding section void on the other layer, and a second relatively movable member having a winding electrically related to said cofunction windings.

2. A winding member for a position measuring transformer comprising first and second layers of cofunction windings, each of said layers including a substantially equal number of active conductors, said active conductors forming winding sections of first and of second cofunction types, each of said layers including active conductors separated by active conductor voids, said voids in each layer characterized by the absence of active conductors, wherein said first layer is superposed over said second layer so that each winding section on each layer is superposed with a corresponding winding section void on the other layer.

3. The member of claim 2 wherein at least some of said winding sections are formed with active conductors from each of said layers.

4. The member of claim 2 wherein said active conductors are printed on an insulated layer and wherein said active conductors are connected into winding sections by printed inactive conductors.

5. The member of claim 2 wherein the number of active conductors forming said winding sections of said first cofunction type equals the number of active conductors forming said winding sections of said second cofunction type.

6. A winding member for a position measuring transformer comprising, a first layer having first active conductors connected to form first winding sections appearing substantiaLly at selected intervals of a first plurality of periodic intervals and having second active conductors connected to form second winding sections appearing substantially at selected intervals of a second plurality of periodic intervals, at least some of said first and second active conductors separated by active conductor voids, a second layer having third active conductors connected to form third winding sections appearing substantially at selected intervals of said first plurality of periodic intervals and having fourth active conductors connected to form fourth winding sections appearing substantially at selected intervals of said secondplurality of periodic intervals, at least some of said third and fourth active conductors separated by active conductor voids, said first, second, third, and fourth winding sections being of the cofunction type with winding sections of each layer separated by winding section voids, said voids being characterized by the absence of active conductors, and wherein said first layer is superposed over said second layer so that each winding section on each layer is superposed with a corresponding winding section void on the other layer, insulating means securing said first and second layers together to form a composite layer wherein said first and third winding sections are interdigitated with said second and fourth winding sections and wherein each of said first, second, third and fourth active conductors is disposed in an array each terminating with one end in a first direction thereby forming a first margin on said layers and each terminating with an opposite end in an opposite second direction thereby forming a second margin on said layers, said member further including, first inactive conductors for interconnecting said first winding sections along said first margin on said first layer, second inactive conductors for interconnecting said second winding sections along said second margin of said first layer, third inactive conductors, superposed over said first inactive conductors, for interconnecting said third winding sections along said first margin on said second layer, fourth inactive conductors, superposed over said second inactive conductors, for interconnecting said fourth winding sections along said second margin on said second layer, and means connecting said first and third inactive conductors and means connecting said second and fourth inactive conductors so as to cause current in said first inactive conductors to be opposite in direction to the current in said third inactive conductors, and so as to cause current in said second inactive conductors to be opposite in direction to the current in said fourth inactive conductors whereby unwanted inductive fields from said first and third inactive conductors tend to cancel and whereby unwanted inductive fields from said second and fourth inactive conductors tend to cancel.

7. In a position measuring transformer having a pair of relatively movable transformer members, one of said members comprising first and second layers, each of said layers having interspaced first and second groups of active conductors thereon, forming winding sections of first and of second cofunction types wherein each layer includes winding section voids, said voids being characterized by the absence of active conductors, and wherein said first layer is superposed over said second layer so that each winding section on each layer is superposed with a corresponding winding section void on the other layer, said active conductors extending at least substantially transversely of the direction of relative movement of said members, the groups of said first layer being interspaced with the groups of said second layer to form an array, means including first circuit conductors extending on one side of said array on each of said layers connecting said first groups on the corresponding layer in a first series circuit, first connecting means connecting said first serIes circuit on said first layer to said first series circuit on said second layer, means including second circuit conductors on the opposite side of said array on each of said layers connecting said second groups on the corresponding layer in a series circuit, and second connecting means connecting said second series circuit on said first layer to said second series circuit on said second layer.

8. A transformer member according to claim 7 wherein said circuit conductors extend along said array and out of inductive coupling relation to said active conductors.

9. A transformer member according to claim 8 wherein said active conductors and said circuit conductors in each of said layers comprise continuous printed circuit elements.

10. A transformer member according to claim 7 wherein said first groups form a first winding and said second groups form a second winding in quadrature relation to said first winding.

11. A transformer member according to claim 7 wherein said first circuit conductors in said first layer extend in inductive coupling relation to said first circuit conductors in said second layer, said first circuit conductors in said first layer being effective to carry current in a direction opposite to the current carried by said first circuit conductors in said second layer and wherein said second circuit conductors in said first layer extend in inductive coupling relation to said second circuit connectors in said second layer, said second circuit connectors in said first layer being effective to carry current in a direction opposite the current carried by said second circuit connectors in said second layer.

12. A transformer member according to claim 7 wherein said groups are spaced from each other in interdigitized relation and are arranged in two similar patterns on opposite sides of a center line.

13. A transformer according to claim 7 wherein the terminal groups of said array each comprises an active conductor in said first layer and an active conductor in said second layer.

14. A transformer member according to claim 7 wherein the terminal group at one end of said array comprises an active conductor in said first layer and an active conductor in said second layer, said first conducting means connecting said last two mentioned active conductors at adjacent ends thereof, and wherein the terminal group at the opposite end of said array comprises an active conductor in said first layer and an active conductor in said second layer, said second conducting means connecting said last two mentioned active conductors at adjacent ends thereof.

15. A position measuring transformer comprising relatively movable transformer members, one of said members having windings of the cofunction type, each winding having a first portion thereof arranged in a first layer and a second portion juxtaposed therewith in a second layer, separate means for connecting the portions of each significance in series, said first portions each comprising sections of active conductors having means in said first layer connecting consecutive sections in series, said second portions each comprising sections of active conductors having means in said second layer connecting consecutive sections in series, said sections in said first and second layers being of the first and second cofunction type, each of said layers having voids between each of the sections, said voids having no active conductors therein, said first layer being superposed over said second layer so that each winding section on each layer is superposed with a corresponding winding section void on the other layer, another of said transformer members having a cofunction winding inductively related to said windings of.

16. A position measuring transformer comprising relatively movable transformer members, one of said members having sine and cosine windings each having a first portion thereof arranged in a first layer and a second portion juxtaposed therewith in a second layer, separate means for connecting the sine portions and cosine portions, respectively, in series, said first sine and cosine winding portions each comprising staggered sections of active conductors having means in said first layer connecting consecutive sections in series, said second sine and cosine winding portions each comprising staggered sections of active conductors having means in said second layer connecting consecutive sections in series, each of said layers having voids between each of the sections, said voids having no active conductors therein, said first layer being superposed over said second layer so that each winding section on each layer is superposed with a corresponding winding section void on the other layer, another of said transformer members having a winding inductively related to said sine and cosine windings.

17. A transformer according to claim 16, said sections of the sine and cosine winding portions of each layer having spaces juxtaposed with said sections of the sine and cosine winding portions of the other layer.

18. A transformer according to claim 16, wherein consecutive sine sections and consecutive cosine sections of each layer are each spaced apart providing spaces therebetween, each space juxtaposed with both a sine section and a cosine section of the other layer.

19. A transformer according to claim 16, wherein consecutive sine sections of one layer are spaced apart providing a space, one portion of said space containing a cosine section of that layer and another portion of said space being juxtaposed with both sine and cosine sections of the other layer, and wherein consecutive cosine sections of said one layer being spaced apart providing a space, one portion of said last-mentioned space containing a sine section of said one layer and another portion of said last-mentioned space being juxtaposed with both sine and cosine sections of said other layer.