Salient pole core and salient pole electronically commutated motor

• US 4,712,035 A
• Filed: 11/12/1985
• Issued: 12/08/1987
• Est. Priority Date: 11/12/1985
• Status: Expired due to Fees

• Current Assignee: General Electric Company
• Original Assignee: General Electric Company
• Inventors: Harms, Harold B., Forbes, Franklin L.
• Primary Examiner(s): Wong, Peter S.
• Assistant Examiner(s): Rebsch, D. L.
• Application Number:
  US06/796,779
• Time in Patent Office: 756 Days
• Field of Search: 29/596, 310/42, 310/43, 310/67 R, 310/216, 310/217, 310/218, 310/268, 310/269, 310/156
• US Class Current: 310/269
• CPC Class Codes: D06F 2103/46 of the motor driving the drum
• CPC Class Codes: D06F 2105/48 Drum speed
• CPC Class Codes: D06F 34/08 Control circuits or arrangements thereof
• CPC Class Codes: D06F 37/304 Arrangements or adaptations of electric motors
• CPC Class Codes: H02K 1/148 Sectional cores H02K1/141 takes precedence
• CPC Class Codes: H02K 15/022 with salient poles or claw-shaped poles
• CPC Class Codes: H02K 21/22 with magnets rotating around the armatures, e.g. flywheel magnetos
• CPC Class Codes: H02K 29/06 with position sensing devices H02K29/03 takes precedence
• CPC Class Codes: H02K 29/12 using detecting coils using the machine windings as detecting coil
• CPC Class Codes: H02K 3/28 Layout of windings or of connections between windings windings for pole-changing H02K17/06, H02K17/14, H02K19/12, H02K19/32
• CPC Class Codes: H02K 7/14 Structural association with mechanical loads, e.g. with hand-held machine tools or fans with fan or impeller for cooling the machine H02K9/06
• CPC Class Codes: H02P 6/085 in a bridge configuration
• CPC Class Codes: H02P 6/181 using different methods depending on the speed
• CPC Class Codes: Y10T 29/49009 Dynamoelectric machine

Abstract

An inside-out salient pole core for a dynamo-electric machine. The core has an edgewise wound yoke including an edgewise and helically wound strip of generally thin ferromagnetic material having at least one edge defining an outer circumferential surface on the edgewise wound yoke and extending generally axially thereacross. A set of salient pole pieces is secured to the edgewise wound core at least generally adjacent its outer circumferential surface, and extends generally outwardly from the outer circumferential surface about a set of preselected pitch axes, respectively.

Claims

1. A salient pole stator core for a dynamoelectric machine having a plurality of concentrated windings comprising:

an edgewise wound yoke including a lanced strip of generally thin ferromagnetic material having a pair of generally opposite edges and being edgewise wound into a plurality of generally helical convolutions arranged in a generally annular stack thereby to define said edgewise wound yoke, a pair of opposite end portions on said wound lanced strip defining a pair of first opposite end faces on said edgewise wound yoke, said opposite edges defining generally radially spaced apart outer and inner circumferential surface extending a preselected axial length across said edgewise wound yoke between said first opposite end faces, and a plurality of spaced apart notches in one of said opposite edges and aligned in a plurality of notch rows extending generally axially across said outer circumferential surface between said first opposite end faces, respectively;

a set of salient pole means for respectively receiving the concentrated windings and arranged on a set of preselected pitch axes so as to extend generally radially outwardly from said outer circumferential surface, said salient pole piece means each including a plurality of lanced laminations of a generally thin ferromagnetic material with said lanced laminations being secured together generally in face-to-face relation in a stack thereof, a pair of second opposite end faces on said lanced lamination stack and arranged at least generally in planar relation with said first opposite end faces, an intermediate winding receiving section on said lanced lamination stack interposed between a generally arcuate tip section and a base section thereof, said tip section extending generally radially beyond said intermediate section in spaced apart relation with said outer circumferential surface and said base section being arranged in engagement with said outer circumferential surface at least generally adjacent a respective one of said notch rows, and extension means on said base section and received in said respective one notch row in displacement preventing engagement therewith for retaining said each salient pole piece means against displacement from said edgewise wound yoke, said intermediate, tip and base sections and said extension means extending between said second opposite end faces, respectively;

means disposed at least in part within said notch rows and engaged between said extension means and said edgewise wound yoke for retaining said extension means in the displacement preventing engagement thereof with said notch rows, respectively; and

a set of winding receiving slots extending across the preselected axial length of said edgewise wound core and defined between said outer circumferential surface and adjacent ones of said salient pole piece means, and each of said slots including an open end extending between said tip sections of said adjacent ones of said salient pole piece means, respectively.

2. A salient pole core for a dynamoelectric machine comprising:

an edgewise wound yoke including a lanced strip of generally thin ferromagnetic material edgewise and helically wound into a plurality of helical convolutions arranged generally in aligned relation in a generally loose wound annular stack defining said edgewise wound yoke, at least one edge on said wound lanced strip having a plurality of spaced apart notches therein with said at least one edge defining an outer circumferential surface on said edgewise wound yoke and with said notches extending in a plurality of rows thereof generally axially across said outer circumferential surface, respectively; and

a set of salient pole pieces extending on a set of preselected pitch axes generally outwardly from said outer circumferential surface and said salient pole pieces including a set of extension means received in said notch rows for retaining said salient pole pieces against displacement from said edgewise wound yoke and for retaining said helical convolutions against displacement from their aligned relation in said annular stack, respectively.

3. A salient pole core for a dynamoelectric machine comprising:

an edgewise wound yoke including a lanced strip of generally thin ferromagnetic material edgewise and helically wound into a plurality of helical convolutions arranged generally in aligned relation in a generally loose wound annular stack defining said edgewise wound yoke, at least one edge on said wound lanced strip having a plurality of spaced apart extensions thereon with said at least one edge defining an outer circumferential surface on said edgewise wound yoke and with said extensions extending in a plurality of extension rows generally axially across said outer circumferential surface, respectively; and

a set of salient pole pieces extending on a set of preselected pitch axes generally outwardly from said outer circumferential surface on said edgewise wound yoke, and said salient pole pieces including a set of notch means receiving said extension rows on said outer circumferential surface of said edgewise wound yoke in displacement preventing engagement for retaining said salient poles against displacement from said edgewise wound yoke and for retaining said helical convolutions against displacement from their aligned relation in said annular stack, respectively.

4. A salient pole core for a dynamoelectric machine comprising:

an edgewise wound yoke including an edgewise and helically wound lanced strip of generally thin ferromagnetic material arranged generally in aligned relation in a generally annular stack and having at least one edge defining an outer circumferential surface on said edgewise wound yoke, and extending generally axially thereacross;

a set of salient pole pieces extending about a set of preselected pitch axes generally outwardly from said circumferential surface on said edgewise wound yoke respectively; and

said edgewise wound yoke and said salient pole pieces including a pair of sets of means associated in displacement preventing engagement for retaining said salient pole pieces against displacement from said edgewise wound yoke and for retaining said edgewise and helically wound lanced strip against displacement from the aligned relation thereof in said annular stack, respectively.

5. A salient pole core as set forth in claim 4 wherein said retaining means of one of said retaining means sets comprise a set of groove means in said outer circumferential surface extending generally axially across said edgewise wound yoke for receiving in the displacement preventing engagement said retaining means of the other of said retaining means sets on said salient pole pieces, and said groove means being defined by a plurality of notches in said at least one edge of said wound lanced strip arranged generally in a plurality of rows thereof generally axially across said edgewise wound yoke, respectively.

6. A salient pole core as set forth in claim 5 wherein said retaining means of said other retaining means includes a set of extension means on said salient pole pieces for reception in said groove means of said edgewise wound yoke in the displacement preventing engagement therewith, respectively.

7. A salient pole core as set forth in claim 4 wherein said retaining means of one of said retaining means sets comprises a set of groove means in said salient pole pieces for receiving in the displacement preventing engagement said retaining means of the other of said retaining means sets on said edgewise wound yoke, respectively.

8. A salient pole core as set forth in claim 7 wherein said retaining means of said other retaining means set includes a set of extension means extending generally radially outwardly from said outer circumferential surface on said edgewise wound yoke and generally axially thereacross for reception in the displacement preventing engagement within said groove means in said salient pole pieces, and said extension means being defined by a plurality of spaced apart projections extending from said at least one edge on said wound lanced strip and arranged generally in a plurality of rows thereof generally axially across said edgewise wound core, respectively.

9. A salient pole core as set forth in claim 4 further comprising a set of wedge means for association in engagement between said retaining means of said pair of sets thereof, respectively.

10. A salient pole core for a dynamoelectric machine comprising:

an edgewise wound yoke including an edgewise and helically wound strip of generally thin ferromagnetic material arranged generally in aligned relation in a generally annular stack and having at least one edge defining an outer circumferential surface on said edgewise wound yoke and extending generally axially thereacross; and

a set of salient pole pieces secured in displacement preventing engagement to said edgewise wound yoke at least generally adjacent its outer circumferential surface so as to retain said wound strip against displacement from said annular stack and extending generally outwardly from said outer circumferential surface about a set of preselected pitch axes, respectively.

11. A salient pole core as set forth in claim 10 further comprising a hardenable adhesive means disposed between said salient pole pieces and said outer circumferential surface on said edgewise wound yoke for effecting the securement thereto of said salient pole pieces, respectively.

12. A salient pole core as set forth in claim 10 wherein each of said salient pole pieces comprises a plurality of lanced laminations of generally thin ferromagnetic material with said lanced laminations being secured together generally in interfacing relation in a stack thereof, respectively.

13. A salient pole core as set forth in claim 10 wherein said edgewise wound yoke and said salient pole pieces each include a pair of opposite end faces arranged generally in parallel relation with each other and with said outer circumferential surface on said edgewise wound yoke extending generally axially between said opposite end faces thereof, respectively.

14. A salient pole core as set forth in claim 10 wherein said salient pole pieces include a set of generally arcuate tip sections arranged generally in radially spaced apart relation with said outer circumferential surface on said edgewise wound yoke, respectively.

15. A salient pole core as set forth in claim 10 wherein said edgewise wound yoke further includes another edge on said wound strip generally opposite said at least one edge thereof and defining an inner circumferential surface extending generally axially across said edgewise wound yoke in radially spaced apart relation with said outer circumferential surface thereof.

16. A salient pole core as set forth in claim 10 further comprising a set of extensions on one of said salient pole pieces and said outer circumferential surface of said edgewise wound core, and a set of groove means in the other of said salient pole pieces and said outer circumferential surface of said edgewise wound core for receiving in displacement preventing engagement said extensions thereby to effect the securement of said salient pole pieces to said edgewise wound yoke, respectively.

17. A salient pole core as set forth in claim 16 further comprising a set of means for wedging in engagement between said extensions and said groove means, respectively.

37. A salient pole core as set forth in claim 10 further comprising a set of extensions on one of said outer circumferential surface of said edgewise wound yoke and said salient pole pieces, and a set of groove means in the other of said outer circumferential surface of said edgewise wound yoke and said salient pole pieces for receiving in displacement preventing engagement said extensions, respectively.

38. A salient pole core as set forth in claim 37 further comprising a set of means for wedging in engagement between said extensions and said groove means, respectively.

18. A salient pole core for a dynamoelectric machine comprising:

an edgewise wound yoke including a plurality of edgewise and helically wound convolutions of a lanced strip of a generally thin ferromagnetic material arranged generally in aligned relation in a generally loose wound annular stack defining said yoke, said yoke having an outer circumferential surface extending generally axially thereacross; and

a set of salient pole pieces extending on a set of preselected pitch axes generally outwardly from said outer circumferential surface on said edgewise wound yoke, each of said salient pole pieces including a plurality of lanced laminations of generally thin ferromagnetic material arranged generally in a stack thereof and secured together in interfacing relation, an intermediate winding receiving section on said lanced lamination stack interposed between a generally arcuate tip section and a base section thereof, said arcuate tip section of said lanced lamination stack being arranged generally in radially spaced relation with said outer circumferential surface on said edgewise wound yoke, and said base section being secured in displacement preventing engagement to said edgewise wound yoke at least generally adjacent said outer circumferential surface to retain said helical convolutions against displacement from their aligned relation in the annular stack, respectively.

19. A salient pole electronically commutated motor comprising:

an edgewise wound yoke including a first lanced strip of generally thin ferromagnetic material having a pair of first generally opposite edges and being edgewise wound into a plurality of first generally helical convolutions thereof arranged in a first generally annular stack thereby to define said edgewise wound yoke, a pair of first opposite end portions on said first wound lanced strip defining a pair of first opposite end faces on said edgewise wound yoke, said first opposite edges on said first wound lanced strip defining generally radially spaced apart first outer and inner circumferential surfaces extending a preselected axial length across said edgewise wound yoke between said first opposite end faces thereon, and a plurality of first spaced apart notches in one of said first opposite edges of said first wound lanced strip and aligned in a plurality of first rows thereof extending generally axially across said first outer circumferential surface of said edgewise wound yoke between said first opposite end faces thereof, respectively;

a set of salient pole pieces arranged on a set of preselected pitch axes therefor about said first outer circumferential surface on said edgewise wound yoke, said salient pole pieces each including a plurality of lanced laminations of generally thin ferromagnetic material with said lanced laminations being secured together generally in face-to-face relation in a stack thereof, a pair of second opposite end faces on said lanced lamination stack and arranged at least generally coextensively with said first opposite end faces on said edgewise wound yoke, an intermediate section on said lamination stack interposed between a generally arcuate tip section and a base section thereof, said tip section extending generally radially beyond said intermediate section in spaced apart relation with said first outer circumferential surface on said edgewise wound yoke and said base section being arranged in engagement with said first outer circumferential surface at least generally adjacent a respective one of said first notch rows therein, and extension means on said base section and received in said respective one first notch row in displacement preventing engagement therewith for retaining said each salient pole piece against displacement from said edgewise wound yoke, said intermediate, tip and base sections and said extension means extending between said second opposite end faces on said each salient pole piece, respectively;

a set of means disposed at least in part within said first notch rows and engaged between said extension means on said salient pole pieces and said edgewise wound yoke for retaining said extension means on said salient pole pieces in the displacement preventing engagement thereof with said first notch rows in said first outer circumferential surface of said edgewise wound yoke, respectively;

a set of winding stage receiving slots extending across the preselected axial length of said edgewise wound core and defined between said first outer circumferential surface thereon and adjacent ones of said salient pole pieces, and each of said slots including an open end extending between said tip sections of said adjacent ones of said salient pole pieces, respectively;

a multistage winding arrangement associated with said salient pole pieces and including a set of concentrated winding stages adapted to be electronically commutated in at least one preselected sequence, respectively, each of said concentrated winding stages being disposed about said intermediate section of respective ones of said lanced lamination stacks between said tip section and base section thereof so as to extend through adjacent ones of said slots, and said each concentrated winding stage comprising an insulated conductor with at least one conductor turn thereof disposed about said intermediate section of said respective ones of said lanced lamination stacks;

a set of means for insulating said salient pole pieces and parts adjacent thereto of said outer circumferential surface on said yoke from said concentrated winding stages, respectively; and

an edgewise wound rotor including a second lanced strip of generally thin ferromagnetic material having a pair of second generally opposite edges and being edgewise wound into a plurality of second generally helical convolutions thereof arranged in a second generally annular stack thereby to define said edgewise wound rotor, a pair of second opposite end portions on said second wound lanced strip defining a pair of third opposite end faces on said edgewise wound rotor, said second opposite edges on said second wound lanced strip defining generally radially spaced apart second outer and inner circumferential surfaces extending a preselected axial length across said edgewise wound rotor between said third opposite end faces thereon and with said second inner circumferential surface extending generally circumferentially about said tip sections of said salient pole pieces on said edgewise wound yoke, and a plurality of second spaced apart notches in one of said second opposite edges of said second wound lanced strip and aligned in a plurality of second rows thereof extending generally axially across said second inner circumferential surface of said edgewise wound rotor between said third opposite end faces thereof, respectively; and

a set of permanent magnet material elements disposed at least in part within said second spaced apart notches in said second inner circumferential surface on said edgewise wound rotor and secured thereto against displacement, said edgewise wound rotor and said permanent magnet material elements being associated in selective magnetic coupling relation with said concentrated winding stages so as to be conjointly rotatably driven thereby upon the electronic commutation of at least some of said concentrated winding stages in the at least one preselected sequence, respectively.

20. A salient pole electronically commutated motor comprising:

a generally annular edgewise wound yoke including a plurality of first generally helical convolutions of a first edgewise deformed lanced strip of generally thin ferromagnetic material having a pair of first generally opposite edges thereon defining first outer and inner circumferential surfaces on the yoke section extending generally axially thereacross, respectively;

a set of salient pole pieces disposed on a set of preselected pitch axes therefor generally about said first outer circumferential surface on said yoke so as to extend generally outwardly therefrom, respectively, each of said salient pole pieces including a plurality of lanced laminations of a generally thin ferromagnetic material secured together in a stack thereof, an intermediate section on said lanced lamination stack, a base section on said lanced lamination stack integral with said intermediate section thereof and engaged with said first outer circumferential surface, a generally arcuate tip section integral with said intermediate section and spaced from said base section, and a pair of opposite tip ends on said tip section extending beyond said intermediate section in spaced apart relation with said first outer circumferential surface on said yoke section, respectively;

a multistage winding arrangement associated with said salient pole pieces including a set of concentrated winding stages adapted to be electronically commutated in at least one preselected sequence, said concentrated winding stages comprising a set of insulated conductors having at least one conductor turn thereof disposed about said intermediate sections on said lanced lamination stack of said salient pole pieces, respectively;

a generally annular edgewise wound rotor including plurality of second generally helical convolutions of a second edgewise deformed lanced strip of generally thin ferromagnetic material having a pair of second opposite edges thereon defining second outer and inner circumferential surfaces on the rotor extending generally axially thereacross, respectively, said second inner circumferential surface on said rotor being arranged generally in radially spaced apart relation with said tip sections of said salient pole pieces and said first outer circumferential surface on said yoke; and

a set of permanent magnet material elements secured to said rotor at least generally adjacent said second inner circumferential surface thereof and arranged in generally arcuately spaced relation with respect to each other about said second inner circumferential surface, respectively, said permanent magnet material elements and said rotor being associated in selective magnetic coupling relation with said concentrated winding stages so as to be conjointly rotatably driven thereby upon the electronic commutation of at least some of said concentrated winding stages in the at least one preselected sequence, respectively.

21. A salient pole electronically commutated motor comprising:

an edgewise wound yoke including a lanced strip of generally thin ferromagnetic material edgewise and helically wound into a plurality of helical convolutions arranged in a generally annular stack thereof defining said edgewise wound yoke, at least one edge on said wound lanced strip having a plurality of spaced apart notches therein with said at least one edge defining an outer circumferential surface on said edgewise wound yoke and with said notches extending in a plurality of rows thereof generally axially across said outer circumferential surface, respectively;

a set of salient pole pieces extending on a set of preselected pitch axes therefor generally about said outer circumferential surface on said edgewise wound yoke, and said salient pole pieces including a set of extension means received in said notch rows in said outer circumferential surface on said edgewise wound yoke in displacement preventing engagement therewith for retaining said salient pole pieces against displacement from said edgewise wound yoke, respectively;

a multistage winding arrangement associated with said salient pole pieces and including a set of concentrated winding stages disposed about at least respective ones of said salient pole pieces and adapted to be electronically commutated in at least one preselected sequence, respectively; and

permanent magnet rotor means arranged generally circumferentially about said salient pole pieces and associated in selective magnetic coupling relation with said concentrated winding stages for driven rotation in response to the electronic commutation of at least some of said concentrated winding stages in the at least one preselected sequence, respectively.

22. A salient pole core for a dynamoelectric machine comprising:

an edgewise wound yoke including a lanced strip of generally thin ferromagnetic material edgewise and helically wound into a plurality of helical convolutions arranged in a generally annular stack thereof defining said edgewise wound yoke, at least one edge on said wound lanced strip having a plurality of spaced apart extensions thereon with said at least one edge defining an outer circumferential surface on said edgewise wound yoke and with said extensions extending in a plurality of rows thereof generally axially across said outer circumferential surface, respectively;

a set of salient pole pieces extending on a set of preselected pitch axes therefor generally about said outer circumferential surface on said edgewise wound yoke, and said salient pole pieces including a set of notch means receiving said extension rows on said outer circumferential surface of said edgewise wound yoke in displacement preventing engagement for retaining said salient pole pieces against displacement from said edgewise wound yoke, respectively;

a multistage winding arrangement associated with said salient pole pieces and including a set of concentrated winding stages disposed about at least respective ones of said salient pole pieces and adapted to be electronically commutated in at least one preselected sequence, respectively; and

permanent magnet rotor means rotatably arranged generally circumferentially about said salient pole pieces and associated in selective magnetic coupling relation with said concentrated winding stages for driven rotation in response to the elctronic commutation of at least some of said concentrated winding stages in the at least one preselected sequence, respectively.

23. A salient pole electronically commutated motor comprising:

an edgewise wound yoke including an edgewise and helically wound lanced strip of generally thin ferromagnetic material having at least one edge defining an outer circumferential surface on said edgewise wound yoke and extending generally axially thereacross;

a set of salient pole pieces extending about a set of preselected pitch axes generally outwardly from said circumferential surface on said edgewise wound core, respectively;

said edgewise wound yoke and said salient pole pieces including a pair of sets of means associated in displacement preventing engagement for retaining said salient pole pieces against displacement from said edgewise wound yoke and for retaining said wound lanced strip against displacement in said edgewise wound yoke, respectively;

a multistage winding arrangement with said salient pole pieces and including a set of concentrated winding stages disposed about at least respective ones of said salient pole pieces and adapted to be electronically commutated in at least one preselected sequence, respectively; and

permanent magnet rotor means arranged generally circumferentially about said salient pole pieces and associated in selective magnetic coupling relation with said concentrated winding stages for driven rotation in response to the electronic commutation of at least some of said concentrated winding stages in the at least one preselected sequence, respectively.

24. A salient pole electronically commutated motor as set forth in claim 23 wherein said retaining means of one of said retaining means sets comprise a set of groove means in said outer circumferential surface extending generally axially across said edgewise wound yoke for receiving in the displacement preventing engagement said retaining mean of the other of said retaining means set on said salient pole pieces, and said groove means being defined by a plurality of notches in said at least one edge of said wound lanced strip arranged generally in a plurality of rows thereof generally axially across said edgewise wound yoke, respectively.

25. A salient pole electronically commutated motor as set forth in claim 24 wherein said retaining means of said other retaining means includes a set of extension means on said salient pole pieces for reception in said groove means of said edgewise wound yoke in the displacement preventing engagement therewith, respectively.

26. A salient pole electronically commutated motor as set forth in claim 23 wherein said retaining means of one of said retaining means sets comprise a set of groove means in said salient pole pieces for receiving in the displacement preventing engagement said retaining means of the other of said retaining means sets on said edgewise wound yoke, respectively.

27. A salient pole electronically commutated motor as set forth in claim 26 wherein said retaining means of said other retaining means set includes a set of extension means extending generally outwardly from said outer circumferential surface on said edgewise wound yoke and generally axially thereacross for reception in the displacement preventing engagement within said groove means in said salient pole pieces, and said extension means being defined by a plurality of spaced apart projections extending from said at least one edge on said wound lanced strip and arranged generally in a plurality of rows thereof generally axially across said edgewise wound core, respectively.

28. A salient pole electronically commutated motor as set forth in claims 23, 24, 25, 26 or 27 further comprising a set of means for association in wedging engagement between said retaining means of said retaining means sets, respectively.

29. A salient pole electronically commutated motor as set forth in claim 23 wherein each of said concentrated winding stages includes an insulated conductor having at least one conductor turn thereof disposed about said at least respective ones of said salient pole pieces.

30. A salient pole electronically commutated motor as set forth in claim 29 further comprising a printed circuit board secured to said edgewise wound yoke and connected in circuit relation with said insulated conductors, respectively.

31. A salient pole electronically commutated motor comprising:

an edgewise wound yoke including an edgewise and helically wound strip of generally thin ferromagnetic material having at least one edge thereon defining an outer circumferential surface on said edgewise wound yoke and extending generally axially thereacross;

a set of salient pole pieces seated on said outer circumferential surface and secured to said edgewise wound yoke at least generally adjacent said outer circumferential surface so as to extend outwardly from said circumferential surface on a set of preselected pitch axes, respectively;

a multistage winding arrangement associated with said salient pole pieces and including a set of concentrated winding stages disposed about at least respective ones of said salient pole pieces and adapted to be electronically commutated in at least one preselected sequence, respectively; and

permanent magnet rotor means arranged generally circumferentially about said salient pole pieces and associated in selective magnetic coupling relation with said concentrated winding stages for driven rotation upon the electronic commutation of at least some of said concentrated winding stages in the at least one preselected sequence, respectively.

32. A salient pole electronically commutated motor as set forth in claim 31 wherein said permanent magnet rotor means includes an edgewise wound rotor having another edgewise and helically wound strip of generally thin ferromagnetic material with at least one edge thereon defining an inner circumferential surface on said rotor extending generally axially thereacross and generally circumferentially about said salient pole pieces, respectively.

33. A salient pole electrically commutated motor as set forth in claim 31 wherein said permanent magnet rotor means includes a set of generally arcuate segments of ferromagnetic material secured together against displacement so as to define a generally annular rotor having an inner circumferential surface extending generally axially thereacross and generally circumferentially about said salient pole pieces, respectively.

34. A salient pole electronically commutated motor as set forth in claim 32 or 33 wherein said permanent magnet rotor means further includes a set of permanent magnet material elements secured to said rotor at least generally adjacent said inner circumferential surface thereof and arranged in preselected arcuate spaced apart relation about said inner circumferential surface, respectively.

35. A salient pole electronically commutated motor as set forth in claim 31 further comprising a hardenable adhesive means disposed between said salient pole pieces and said outer circumferential surface on said edgewise wound yoke for effecting the securement thereto, of said salient pole pieces, respectively.

36. A salient pole core as set forth in claim 31 wherein each of said salient pole pieces comprises a plurality of lanced laminations of generally thin ferromagnetic material with said lanced laminations being secured together generally in interfacing relation in a stack thereof, respectively.

39. A salient pole electronically commutated motor as set forth in claim 31 wherein said concentrated winding stages comprise a set of insulated conductors having at least one conductor turn thereof disposed about said salient pole pieces, respectively.

40. A salient pole electronically commutated motor as set forth in claim 39 further comprising a printed circuit board mounted to said yoke and connected in circuit relation with said insulated conductors, respectively.