Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1982-06-10
1984-07-31
Skudy, R.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 71, 310198, H02K 122
Patent
active
044632762
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to coil units of coreless armatures used in direct current miniature motors and, more particularly, to a coil unit of coreless armatures which consists of coil elements wound into a cylindrical shape at an extremely high density.
The coil unit of the kind referred to is used for example, in direct current miniature motors (FIG. 1).
That is, in the direct current miniature motor a stator is formed by rendering a yoke 41 integral by means of a synthetic resin with a cylindrical permanent magnet 42 provided withing the yoke 41 separated from the inner peripheral surface of the yoke 41, which magnet creates a magnetic field for driving the armature. A coreless armature is formed by fixing a coil unit 16' at its upper end to a commutator plate 17' which is coupled through a metal boss 46 to a shaft 18'. The shaft 18' is rotatable by means of bearings 44 interposed through the permanent magnet 42. A brush plate 51 having terminals 50 connected to brushes 49 is fixed to the open end of the yoke 41.
General ones of conventional coil unit of the coreless armatures have been formed by winding a coil element wire into a barrel-shape with a coil winding machine and subjecting it to a forming into a cylindrical shape.
BACKGROUND ART
As shown in FIG. 2 or 3, these coil units of the coreless armatures have been formed by winding a single coil element wire 1' sequentially in the directions indicated by arrows so as to be diamond-shaped or tapered and shaping it into the cylindrical shape by causing a coating of the coil element wire adhered integral without requiring an iron core. There have been such defects that, at it is necessary to wind up the coil unit with a single winding to the last, it must be made one by one and, therefore, the productivity is low. As the coil element wire is wound up as inclined, the overlapped parts increase with advances of the winding and the diameter will partly increase to cause the diameter of the coil unit to be partly varied. Thus, the coil wire length per turn is non-uniform and has a poor dynamic balance. When the coil element wire is flat, the wire cannot be freely bent as twisted so that a coil unit of coreless armatures of the flat coil element wire in section and small coil thickness cannot be obtained.
Causes of the poor dynamic balance and appearance shall be explained more in detail with reference to FIG. 4.
FG. 4 is a perspective view of an essential part of an example of the conventional coil unit of coreless armatures.
According to the winding formation shown in FIG. 2, first, as has been disclosed, the winding of the coil element wire is made in the order of a , b , c , and d in close contact as shown in FIG. 4 and is terminated in the order of 4 , 3 , 2 , and 1 after making one rotation along the circumference as overlapped on the wire previously wound. The coil element wire parts a , b , c , and d are held by turning parts 4 ', 3 ', 2 ', and 1 ' of 4 , 3 , 2 , and 1 and both groups are adhered to be integral.
The parts 4 and 4 ' of the coil element wire are held by the later wound parts 3 , 2 , and 1 ; the parts 3 and 3 ' are held by the parts 2 and 1 ; the parts 2 and 2 ' are held by the part 1 . The coil element wire parts 1 and 1 40 will no longer have any coil element wire to hold them from above when the turning part of the wire 1 and 1 ' is the last one, and this part is left in a state likely to float up (or to be easily separated). As a result of the foregoings, the coil unit obtained is poor in the dimensional precision of the inner and outer diameters and also poor in appearance.
Further, there have been such defects that, since the wire parts 1 ', 2 ', 3 ', and 4 ' are interposed between the wire parts a , b , c and d exposed below the above-overlapping wire parts 1 , 2 , 3 and 4 and a compression in the surfatial direction is required for making the thickness of the coil unit constant, they are caused to be abruptly bent in the overlapping parts as shown in FIG. 4 to become poor in the unbalanced and, at the same tim
REFERENCES:
patent: 3623220 (1971-11-01), Chase
patent: 3650021 (1972-03-01), Karol
patent: 4103196 (1978-07-01), Saito
patent: 4123679 (1978-10-01), Miyasaka
patent: 4323806 (1982-04-01), Aoki
Matsushita Electric & Works Ltd.
Skudy R.
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