Method of fabricating a stator for a multiple-pole dynamoelectric machine

• US 4,426,771 A
• Filed: 10/27/1981
• Issued: 01/24/1984
• Est. Priority Date: 10/27/1981
• Status: Expired due to Term

• Current Assignee: Emerson Electric Company
• Original Assignee: Emerson Electric Company
• Inventors: Wang, David C., Voepel, Harry W.
• Primary Examiner(s): Hall, Carl E.
• Application Number:
  US06/315,288
• Time in Patent Office: 819 Days
• Field of Search: 29/596, 29/598, 29/736, 310/184, 310/180, 310/198, 310/202-208
• US Class Current: 29/596
• CPC Class Codes: H02K 15/068 Strippers
• 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: Y10S 174/20 Stator
• CPC Class Codes: Y10T 29/49009 Dynamoelectric machine

Abstract

A stator assembly for a multiple-pole (e.g., an 18 pole) induction motor is disclosed having a main winding and an auxiliary winding with the main and auxiliary windings each having a first and a second coil set, each of these coil sets having multiple coils selectively electrically connected together. The stator assembly further includes a core having slots therein for receiving the coils. There is one coil of the first auxiliary winding coil set inserted in the first and third slots of the core, one coil of the first main winding coil set inserted in the second and fourth slots, one coil of the second auxiliary winding coil set inserted in the third and fifth slots, and one coil of the second main winding coil set inserted in the fourth and sixth slots thereby to form a layered coil insertion pattern of the coils in the first six slots of the core. Second coils from each of the coil sets are then inserted in a similar layered fashion in the slots 5-10 of the core to form another layered insertion pattern of the coils in the slots. This layered insertion pattern is repeated until all of the coils are inserted into the slots of the core.

A method of fabricating such a stator assembly for a multiple pole motor is also disclosed.

Claims

1. The method of fabricating a stator for a multiple-pole dynamoelectric machine, said stator comprising a core assembled from a stack of laminations of suitable ferromagnetic sheet-material, said core having a central bore extending therethrough and a plurality of blind slots extending radially outwardly from said bore, said slots being substantially equally angularly spaced around said bore, said stator comprising an auxiliary winding and a main winding, each of the auxiliary and main windings having first and second sets of coils, each set comprising a plurality of coils of suitable magnet wire electrically connected to one another and inserted into said slots, each of said coils having a pair of end turns and a pair of generally straight coil sections extending between said end turns, wherein the method of this invention comprises the steps of:

A. forming the sets of said main winding by forming the same number of coils of magnet wire of a desired size as the number of the poles in said dynamoelectric machine, each of said coils of each of said main winding being electrically connected in a desired pattern;

B. forming the sets of said auxiliary winding by forming the same number of coils of magnet wire of a desired size as the number of poles in said dynamoelectric machine, each of said coils of each of said auxiliary winding sets being electrically connected in a desired pattern; and

C. inserting said auxiliary and main windings in said slots of said core in the following manner so that the coils of said auxiliary and main windings are grouped together in layered fashion in said core by;

i. inserting a first coil of a first set of one of said windings in said core with said straight coil sections of said first coil being received in a first and a third slot of said core,

ii. inserting a first coil of a first set of the other of said windings in said core with said straight coil sections of said first coil of said second winding being received in a second and a fourth core slot,

iii. inserting a first coil of a second set of said one winding in said stator core with said straight coil sections of said second coil of said first winding being received in the third and in a fifth core slot,

iv. inserting a first coil of a second set of said other winding in said stator core with the straight coil sections of said second coil of said other winding being received in the fourth and in a sixth core slot, whereby the inserted coils constitute a first layered grouping of coils in slots 1-6 of said core, and

v. repeating steps (C) (i) through (C) (iv) to form a second layered group of coils in slots 5-10 of said core, and repeating said steps (C) (i) through (C) (iv) until all of said coils are inserted in said core.

2. The method of fabricating a stator assembly for a multiple-pole dynamoelectric machine, said stator assembly comprising a core assembled from a stack of laminations of suitable ferromagnetic sheet-material, said core having a central bore extending therethrough and a plurality of blind slots extending radially outwardly from said bore, said slots being substantially equally angularly spaced around said bore, said stator comprising an auxiliary winding and a main winding, said auxiliary winding including a first and a second auxiliary winding coil set and said main winding including a first and a second main winding coil set, each of said coil sets having a plurality of coils of magnet wire inserted in selective slots of said core, wherein the method of this invention comprises of the steps:

A. forming said first auxiliary winding coil set from a skein of wound magnet wire having a predetermined number of turns of magnet wire therein so that said skein is a coil of petalled, serpentine shape with a series of inwardly and outwardly directing apices with generally straight coil sections extending between said inward and outward apices, said straight coil sections each being adapted to be received in a respective slot of said core and each of said apices being adapted so as to be disposed on the outside of said core and to constitute the end turns of said first auxiliary winding coil set;

B. forming said second auxiliary winding coil set from a skein of wound magnet wire having a predetermined number of turns of magnet wire therein so that said skein is a coil of petalled, serpentine shape with a series of inwardly and outwardly directing apices with generally straight coil sections extending between said inward and outward apices, said straight coil sections each being adapted to be received in a respective slot of said core and each of said apices being adapted so as to be disposed on the outside of said core and to constitute the end turns of said second auxiliary winding coil set;

C. forming said first main winding coil set from a skein of wound magnet wire having a predetermined number of turns of magnet wire therein so that said skein is a coil of petalled, serpentine shape with a series of inwardly and outwardly directing apices with generally straight coil sections extending between said inward and outward apices, said straight coil sections each being adapted to be received in a respective slot of said core and each of said apices being adapted so as to be disposed on the outside of said core and to constitute the end turns of said first main winding coil set;

D. forming said second main winding coil set from a skein of wound magnet wire having a predetermined number of turns of magnet wire therein so that said skein is a coil of petalled, serpentine shape with a series of inwardly and outwardly directing apices with generally straight coil sections extending between said inward and outward apices, said straight coil sections each being adapted to be received in a respective slot of said core and each of said apices being adapted so as to be disposed on the outside of said core and to constitute the end turns of said second main winding coil set;

E. inserting said first auxiliary winding coil set in said core so that a first straight coil section of said first auxiliary winding coil set is received in a first slot of said core and so that the next adjacent straight coil section of said first auxiliary winding coil set is received in a third slot, this insertion pattern being repeated so that a straight coil section of said first auxiliary winding coil set is inserted in the first, third, fifth . . . and next to the last slots of said core around said bore;

F. inserting said first main winding coil set in said core so that a straight coil section of said first main winding coil set is received in a second slot of said core adjacent said first slot and so that the next adjacent straight coil section of said first main winding coil set is received in a fourth slot so that the straight coil sections of said first main winding coil set are received in said second, fourth, sixth . . . and last slots of said core;

G. inserting said second auxiliary winding coil set in said core so that the first straight coil section of said second auxiliary winding coil set is received in the third slot of said core and so that the next straight coil section of said second auxiliary winding coil set is received in a fifth slot of said core so that the straight coil sections of the second auxiliary winding coil set are received in the third, fifth, seventh . . . and first slots of said core; and

H. inserting said second main winding coil set in said core so that the first straight coil section of said second main winding coil set is received in the fourth slot of said core and so that the next straight coil section is received in the sixth slot of said core so that the straight coil sections of said second main winding coil set are received in the fourth, sixth, eighth . . . and second slot of said core.

3. The method of claim 2 in which all of said coil sets are inserted substantially simultaneously in their respective slots.

4. The method of fabricating a stator assembly for a multiple-pole dynamoelectric machine, said stator assembly comprising a core assembled from a stack of laminations of suitable ferromagnetic sheet-material, said core having a central bore extending therethrough and a plurality of blind slots extending radially outwardly from said bore, said slots being substantially equally angularly spaced around said bore, said stator assembly comprising an auxiliary winding and a main winding, said auxiliary winding including a first and second auxiliary winding coil set and said main winding including a first and a second main winding coil set, wherein the method of this invention comprises of the steps:

A. forming said first auxiliary winding coil set so as to have a plurality of coils electrically connected to one another;

B. forming said second auxiliary winding coil set so as to have a plurality of coils electrically connected to one another;

C. forming said first main winding coil set so as to have a plurality of coils electrically connected to one another;

D. forming said second main winding coil set so as to have a plurality of coils electrically connected to one another, each of said coils of said auxiliary and said main winding coil sets having a pair of spaced end turns and a pair of straight coil sections interconnecting the end turns; and

E. inserting first coils of each of said first auxiliary, said first main, said second auxiliary, and said second main winding coil sets in the slots of said core so that the straight coil sections of said first auxiliary winding coil set are received in the first and third slots, so that the straight coil sections of said first main winding coil set are received in the second and fourth slots of said core, so that the straight coil sections of said second auxiliary winding coil set are received in the third and fifth slots of said core, and so that the straight coil sections of said second main winding coil set are received in the fourth and sixth slots thereby to form a layered group of the coils inserted in slots 1-6 and further so that the second, third . . . coils of said coil sets are received in slots 5-10, slots 9-14, etc., with all of the coils being inserted in said slots of said core in layered groups.

5. The method of fabricating a stator assembly for a multiple-pole dynamoelectric machine, said stator assembly comprising a core assembled from a stack of laminations of suitable ferromagnetic sheet-material, said core having a central bore extending therethrough and a plurality of blind slots extending radially outwardly from said bore, said slots being substantially equally angularly spaced around said bore, said stator assembly comprising an auxiliary winding and a main winding, said auxiliary winding including a first and second auxiliary winding coil set and said main winding including a first and a second main winding coil set, wherein the method of this invention comprises of the steps;

A. forming a first coil set so as to have a plurality of coils electrically connected to one another;

B. forming a second coil set so as to have a plurality of coils electrically connected to one another;

C. forming a third coil set so as to have a plurality of coils electrically connected to one another;

D. forming a fourth coil set so as to have a plurality of coils electrically connected to one another, each of said coils of said first, second, third and fourth coil sets having a pair of spaced end turns and a pair of straight coil sections interconnecting the end turns;

E. inserting one coil from said first, second, third and fourth coil sets in six adjacent slots of said core so that the straight coil sections of said one coil of said first coil set are received in said first and third slots, so that said straight coil sections of said one coil of said second coil set are received in the second and fourth slots of said core, so that the straight coil sections of said one coil of said third coil set are received in the third and fifth slots, and so that the straight coil sections of said one coil of said fourth coil set are received in the fourth and sixth slots thereby to form a layered group of coils of said first, second, third and fourth coil sets in slots 1-6; and

F. repeating the steps of paragraph E so as to insert second, third, fourth, . . . etc., coils of said first, second, third and fourth coil sets in slots 5-10, slots 9-14, etc., until all of the coils of said coil sets are inserted in said slots of said core in said layered groups.

6. The method of claim 5 in which all of said coil sets are inserted in their respective slots of said core substantially simultaneously.

7. The method of fabricating a stator assembly for a multiple-pole dynamoelectric machine, said stator assembly comprising a core assembled from a stack of laminations of suitable ferromagnetic sheet-material, said core having a central bore extending therethrough and a plurality of blind slots extending radially outwardly from said bore, said slots being substantially equally angularly spaced around said bore, said stator assembly comprising an auxiliary winding and a main winding, said auxiliary winding including a first and second auxiliary winding coil set and said main winding including a first and a second main winding coil set, wherein the method of this invention comprises of the steps;

A. forming a first coil set so as to have a plurality of coils electrically connected to one another;

B. forming a second coil set so as to have a plurality of coils electrically connected to one another;

C. forming a third coil set so as to have a plurality of coils electrically connected to one another;

D. forming a fourth coil set so as to have a plurality of coils electrically connected to one another, each of said coils of said first, second, third and fourth coil sets having a pair of spaced end turns and a pair of straight coil sections interconnecting the end turns;

E. placing said coil sets on the inserting means of an axial coil inserting apparatus with the coil sets being angularly offset relative to one another; and

F. substantially simultaneously inserting first coils of said coil sets in respective slots of said core so that the straight coil sections of said first auxiliary winding coil set are received in the first and third slots, so that the straight coil sections of said first main winding coil set are received in the second and fourth slots of said core, so that the straight coil sections of said second auxiliary winding coil set are received in the third and fifth slots of said core, and so that the straight coil sections of said second main winding coil set are received in the fourth and sixth slots thereby to form a layered group of the coils inserted in slots 1-6 and further so that the second, third . . . coils of said coil sets are received in slots 5-10, slots 9-14, etc., with all of the coils being inserted in said slots of said core in layered groups.

8. The method of claim 7, further comprising the step of, after forming said coil sets, placing said coil sets on a transfer tool for storage of the coil sets and for transport to said coil inserting apparatus.