METHOD OF WINDING A DYNAMOELECTRIC MACHINE WITH REDUCED COIL DISTORTION

• US 3,760,493 A
• Filed: 10/13/1971
• Issued: 09/25/1973
• Est. Priority Date: 04/20/1970
• Status: Expired due to Term

• Current Assignee: Howard Donald Snively
• Original Assignee: Howard Donald Snively
• Inventors: Snively, Howard Donald
• Primary Examiner(s): Lanham, Charles W.
• Assistant Examiner(s): Hall, Carl E.
• Application Number:
  US05/188,937
• Time in Patent Office: 713 Days
• Field of Search: 29/596,598,605,606 310/42,208,202
• US Class Current: 29/596
• CPC Class Codes: H02K 15/066 inserted perpendicularly to the axis of the slots or inter-polar channels
• CPC Class Codes: H02P 7/2805 whereby the speed is regulated by measuring the motor speed and comparing it with a given physical value
• CPC Class Codes: Y10T 29/49009 Dynamoelectric machine
• CPC Class Codes: Y10T 29/49073 by assembling coil and core

Abstract

An axially slotted dynamoelectric machine member to be wound with two preformed coil sides per slot is provided with a plurality of circumferentially adjacent slots having a depth equal to approximately three times the radial dimension of one coil side. The number of such deep slots is selected to be at least equal to the number of slots in one coil span. In this way, first, second and third slot positions are provided in such slots. A first group of coils are formed having the coil sides in one circumferential direction adapted to be the radially inner coil sides and the other coil sides adapted to be the radially outer coil sides. A second group of coils are formed oppositely to the first group (i.e. with the coil sides in the particular one circumferential direction adapted to be the radially outer coil sides and the other coil sides adapted to be the radially inner coil sides). The coils of one group are sequentially placed in overlapping relation in the slots in the second and third slot positions proceeding in one circumferential direction and the coils of the other group are thereafter placed in the slots in the first and second slot positions proceeding in the other circumferential direction. In this way, a winding is completed without distorting coils by raising any previously placed coil sides from their slots as required in completing corresponding windings of form coils heretofore.

Claims

1. A method of manufacturing a dynamoelectric machine comprising:

a. fabricating a magnetic core having a plurality of axially extending substantially rectangular slots equally circumferentially spaced therein, at least one adjacent series of said slots comprising slots that are each divisible into three radially spaced conductor-receiving portions constituting first, second and third slot positions, with any remaining slots having at least first and second slot positions;

b. preforming a first group of coils having coil sides in one circumferential direction adapted to be radially inner coil sides and the coil sides in the other circumferential direction adapted to be radially outer coil sides;

c. preforming a second group of coils having coil sides in said one circumferential direction adapted to be radially outer coil sides and the coil sides in said other circumferential direction adapted to be radially inner coil sides;

d. inserting coils from said first group sequentially into a plurality of said series of slots in overlapping relation and proceeding in a predetermined circumferential direction, the coil sides of said first group being inserted into the third and second slot positions for which they are adapted and the number of coils in said first group being at least equal to the number of slots spanned by one coil but less than or equal to the difference between the total number of slots and the number of slots spanned by one coil; and

e. inserting the coils from said second group sequentially and in overlapping relation and proceeding in a direction opposite to said predetermined circumferential direction, the coil sides of said second group being inserted into the second and first slot positions for which they are adapted.

2. The method of claim 1 wheRein each of said rectangular slots is divisible by slot wedges receivable in at least three radially spaced pairs of opposing wedge-receiving grooves in each of said slots to provide first, second and third wedge positions, and including the step of inserting wedges into third wedge positions in some of said slots prior to the step of inserting coils from said first group into said last-mentioned slots.