The present invention relates to the manufacture of electric motors and in particular to the termination of stator windings.
Manufacturing stators is labor intensive because stator winds are individually connected to power sources for each phase. Such labor intensive methods add cost to the manufacture of electric motors.
Further, manually formed stator winding connections often result in unequal stator wire lengths which results in current variations, phase imbalances, and harmonics under high current load.
The present invention addresses the above and other needs by providing a method and apparatus for terminating stator windings. The apparatus includes stator winding termination disks having “U” shaped winding mouths for each group of stator winding ends. The stator winding termination disks are laid over the termination end of the stator, the unterminated stator windings for one phase of the stator are placed into the “U” shaped winding mouths, the “U” shaped winding mouths are crimped over the unterminated stator windings, and pressure and heat are applied to melt insulation on the unterminated stator winding ends and form an electrical connection between the stator winding termination disks and stator windings for each phase of the stator.
In accordance with one aspect of the invention, there are provided automated methods for constructing stator winding terminations. The labor intensive aspects of electric motor construction are thus reduced and as a result costs are reduced.
In accordance with another aspect of the invention, there is provided a method for forming consistent stator winding terminations to a common (or yoke) termination disk using the same methods as used for each stator winding termination disk.
In accordance with yet another aspect of the invention, there is provided a method for forming consistent stator winding terminations, resulting in equalized current, and reducing phase imbalances and harmonics under high current load.
In accordance with still another aspect of the invention, there are provided stator leads connected inward to the center, reducing the current path to each other, further reducing imbalances and resistance.
In accordance with yet another aspect of the invention, there is provided a method for layering the basic four stator terminal connections, the common or Y connection, and the three phases, any number of phases may also be added, including Delta connection.
In accordance with yet another aspect of the invention, there is provided a stator winding termination crimping device centered within the diameter of the stator, access to the underside of fixture is possible for fixturing.
In accordance with yet another aspect of the invention, there is provided a method for melting and displacing insulative coatings during crimping and heating in one operation, for example by resistance heating the stator winding wire. The insulation is otherwise difficult to remove without abrasive or mechanical action.
The above and other aspects, features and advantages of the present invention will be more apparent from the following more particular description thereof, presented in conjunction with the following drawings wherein:
Corresponding reference characters indicate corresponding components throughout the several views of the drawings.
The following description is of the best mode presently contemplated for carrying out the invention. This description is not to be taken in a limiting sense, but is made merely for the purpose of describing one or more preferred embodiments of the invention. The scope of the invention should be determined with reference to the claims.
A stator winding termination disk 10 according to the present invention and six first stator winding ends 12 are shown in
A cross-sectional view of the first stator winding ends 12 in the winding mouth 14 according to the present invention, taken along line 2-2 of
A cross-sectional view of the first stator winding ends 12 in the winding mouth 14, taken along line 2-2 of
A cross-sectional view of the first stator winding end 12 in the winding mouth 14, taken along line 2-2 of
A crimped and stripped winding end 20 is shown competed in
An example of a stack of stator winding termination disks 10a, 10b, 10c, a common (or yoke) termination disk 10′, and insulators 22, for a multi-phase motor are shown in
A method for stator winding termination is described in
The method may further include: laying a common stator winding termination disk over the termination end of the stator; laying the unterminated first stator winding ends for one phase of the stator windings into “U” shaped winding mouths of the stator winding termination disk; crimping the “U” shaped winding mouths over the unterminated first stator winding ends; and pressing and heating the crimped winding mouths to melt insulation over the first stator winding ends and form an electrical connection between the stator winding termination disk and the stator windings.
Insulating sleeves may further be placed over the unterminated stator winding ends before attachment to the disks, and the sleeves may be positioned over the terminated stator winding ends after attachment to the disks. Electrically insulating disks are further placed between consecutive disks. The stator winding termination disks are preferably adhering to the stator.
While the invention herein disclosed has been described by means of specific embodiments and applications thereof, numerous modifications and variations could be made thereto by those skilled in the art without departing from the scope of the invention set forth in the claims.
The present application claims the priority of U.S. Patent Provisional Application Ser. No. 61/600,787 filed Feb. 20, 2012, which application is incorporated in its entirety herein by reference.
Number | Date | Country | |
---|---|---|---|
61600787 | Feb 2012 | US |