Metal working – Method of mechanical manufacture – Electrical device making
Patent
1998-12-16
2000-11-21
Young, Lee
Metal working
Method of mechanical manufacture
Electrical device making
29736, 29606, H02K 1500
Patent
active
061484997
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND AND SUMMARY OF THE INVENTION
The invention relates to a method and an apparatus for inserting coils into slots in the cores of electrical machines, the coils being produced on a form and transferred onto an insertion tool consisting of parallel insertion shafts arranged in a circle and an axially driven insertion block, and being drawn thereby into the stator slots.
In the case of certain ratios between the wire size and the width of the space between the insertion shafts as well as other unfavorable factors, the windings tend to jam in the slots when they are advanced by the insertion block along stationary shafts. As a remedy it is known to run together with the insertion block one of two insertion shafts carrying a particular coil strand (cf. DE-PS 19 18 485). It is furthermore known in this connection to run all of the insertion shafts together with the insertion block in the first phase of the insertion process, then to set the free ends of the insertion shafts at approximately the level of the opposite face of the laminated stator core, and lastly to perform the remainder of the insertion movement with the insertion block alone, which in a known manner runs past the free ends of the insertion shafts in order to shape the ends of the coils radially (cf. DE-OS 20 06 526 and DE-AS 26 30 183).
It is a disadvantage that just at the end of the insertion process the insertion block must cover a very long distance while the insertion shafts are already stopped, so that wire jamming can occur. Especially in the case of relatively high coil build-up the entire insertion can be performed but quickly, and then a very long distance must be traveled by the insertion block while the insertion shafts are already at a standstill.
Since the requirements of the winders of compressor motors increase from year to year, and one is striving to improve the efficiency of the motors by not only reducing the size of the stator slots, but also requiring a high fill factor, these new stators can no longer be wound by the insertion method and apparatus known in the state of the art. If it is desired to wind these new stators with, for example, the apparatus of German Patent 26 30 183, it will be found that the insertion stroke with all accompanying shafts through the stator bore and on past the top edge of the stator will work the first time, but the high coil build-up in the slots between the shafts forces the shafts apart at their free upper ends, so that the shafts can not be pulled back down without forcing and this damages the coils.
The invention therefore is addressed to the problem of creating a method and an apparatus of the kind described above by which conditions in the middle and at the end of the insertion process can be improved over the state of the art.
The new method proposed for the solution of the above problem is characterized in that, in a first phase of the insertion process, the insertion block and the short insertion shafts and long insertion shafts are driven synchronously with their upper open ends from a first position through the bore of the stator past the upper edge of the stator to a second position, and that in a second phase the long insertion shafts are retracted to just above the upper edge of the stator, while the insertion block and the short insertion shafts run forward together to a third position, and that in a third phase the insertion block, the short insertion shafts and the long insertion shafts return from the third position to the starting position.
By the proposed method the advantage of all the insertion shafts traveling together is utilized, this movement permitting no relative movement between the coils and the insertion shafts, and thus also there being no danger that the wires may be damaged, while then the stroke of the long insertion shafts is reversed through half the length of the insertion stroke, and on their downward travel halt just above the upper edge of the stator, while the short insertion shafts travel continuously on and upward through the stator and in
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patent: 4521958 (1985-06-01), Barrera
patent: 4536954 (1985-08-01), Hattori
patent: 5826321 (1998-10-01), Pease
ELMOTEC Elektro-Motoren-Technik GmbH
Tugbang A. Dexter
Young Lee
LandOfFree
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