Metal working – Method of mechanical manufacture – Electrical device making
Reexamination Certificate
1999-12-13
2003-01-07
Arbes, Carl J. (Department: 3729)
Metal working
Method of mechanical manufacture
Electrical device making
C029S596000, C029S732000, C029S735000, C029S564500, C242S433300
Reexamination Certificate
active
06502299
ABSTRACT:
TECHNICAL FIELD
The present invention relates to an armature coil winder and a winding method for winding coils at high densities in armature core assemblies for motors.
BACKGROUND ART
In the recent years, attempts have been made to configure motors thinner as a basic theme important for commercial products which use motors as main mechanisms. Out of parts of motors, armatures constitute a highest barrier to the configuration of thinner motors.
FIG. 8
shows a schematic view of a conventional winder and
FIG. 9
illustrates a conventional armature core assembly in which coils are wound.
The conventional winder winds a wound coil in slots
12
a
,
12
a
along a fixed former
21
with a flyer
24
, keeps a coil terminal wire
42
of the coil on a commutator
14
and successively winds a coil in next slots.
The coil which is wound around the fixed former
21
is lead into the slots
12
a
,
12
a
while sliding on the fixed former
21
, set free after it comes off the fixed former
21
, and be wound between alternate slots. Accordingly, a coil end
41
runs for a shortest distance in a space between an armature core
13
and the commutator
14
and is wound linearly as far as it encounters no obstacle. A next coil end
41
is sequentially wound so as to overlap with the coil end
41
which has been wound previously. As a result, an armature core assembly which has been subjected to the coil winding has relative positional relationship wherein the armature core
13
is set lowest, coil ends
41
are wound and piled up on the armature core
13
and the commutator
14
on which terminal wires of the coils are kept is located over the coil ends
41
as shown in FIG.
9
. Accordingly, a total length of an armature is restricted by this relative positional relationship.
Further, the coil end
41
which is linearly wound as described above shields a portion of a slot
12
c
in which a next coil is to be wound, thereby limiting a winding space for a next coil in the slot. To correct this defect, there has been disclosed winders which are equipped with coil pressing mechanisms which press wound coil ends toward centers of rotor cores (for example, by Japanese Patent Laid-Open No. 7-147755). In this case, however, it is required, on the premise that spaces which can accommodate the coil ends are obtainable in surroundings, to reserve the space between the armature core
13
and the commutator
14
for the coil ends
41
.
The relative positional relationship among the armature core
13
, the coil ends
41
and the commutator
14
constitutes a high barrier to the thinning of an armature. To solve this problem, it is necessary to overlap relative positions of the commutator
14
and the coil ends
41
with each other, or it is inevitable to adopt a structure in which the commutator
14
is disposed inside the coil ends
41
as shown in FIG.
2
.
When such a structure is adopted, on the other hand, a space for the coil ends
41
is limited by securing a space for the commutator
14
, the coil ends are restricted to a location only over the slots as exemplified in
FIG. 3
, and the slots
12
c
and
12
d
located between the slots
12
a
,
12
a
in which the coil ends
41
are wound are shielded more largely than the conventional manner, thereby constituting an obstacle to wind coils in the slots
12
c
and
12
d
at the next winding step, or making it impossible to wind coils as required.
Furthermore, slackening and disorder of coils which have already been wound in the slots constitute obstacles which are not negligible to wind coils by fully utilizing spaces in the slots limited by other coil ends as described above. However, coils of armature winding are wound at successive steps and obstacles such as new coil slackening are constituted each time a coil is wound.
To realize thinning of armatures, the present invention has an object to solve the problems described above, thereby providing a winder which winds coils at high densities in limited spaces.
DISCLOSURE OF THE INVENTION
The armature coil winder according to the present invention is an armature coil winder which winds a series of continuous coils in an armature core assembly having a plurality of slots in an outer circumference thereof, wherein the winder has a structure equipped with a winding former equipped with a fixed former for guiding a coil into two slots in which a coil is to be wound and a movable former which restricts a position of a coil end between the two slots by moving in the fixed former along two end surfaces of an armature core toward a center of the core, a former slider equipped with a flyer which winds the coil around the fixed former, and a coil shaping mechanism equipped with coil shaping blades which shape the coil in the slots relative to the armature core assembly. The winding former of this winder moves the former slider to locations corresponding to respective coil ends, thereby forming a winding frame so as to wind the coil ends, restrictedly within a target space, which would be linearly wound and freely spread unless they are restricted. Further, the coil shaping mechanism equipped with the coil shaping blades which shape disorder of the coils already wound in the slots is disposed at a location other than that of the former slider. Accordingly, the winder is capable of controlling a shielding degree of the wound coil ends over slots which are to be subjected next to coil winding and shaping spaces in the slots which are to be subjected next to coil winding in the course of a continuous step, thereby permitting securing a space for a coil to be wound at a next winding step and making it possible to wind coils at a high density.
An invention an claimed in embodiment 1 of the present invention provides an armature coil winder for winding a series of continuous coils in an armature core assembly having a plurality of slots in an outer circumference thereof, wherein the winder comprises a winding former equipped with a fixed former for guiding a coil into two slots in which a coil is to be wound and a movable former which restricts a position of a coil end between the two slots by moving in the fixed former along two end surfaces of an armature core toward a center of the core, a former slider equipped with a flyer which winds the coil around the fixed former, and a coil shaping mechanism equipped with coil shaping blades which shape the coil in the slots relative to the armature core assembly, and is capable of forming a completed winding while winding a coil at a high density in an armature in which spaces for coil ends are limited to locations, for example, over slots for thinning an armature.
An invention as claimed in embodiment 2 of the present invention provides a winding method characterized in that it performs a winding step to form a winding space for each coil by setting a position of a movable former for each coil end so as to restrict a position of a coil end between two slots subjected to coil winding which shields over other slots in conjunction with a coil shaping step to secure the winding space for a coil by performing coil shaping of interiors of slots which are to he subjected to coil winding. This method makes it possible to wind coil ends within a restricted space by moving a winding former to locations corresponding to respective coil ends with a former slider so as to form a winding frame for winding the coil ends within a target space and secure effective spaces in slots which are to be subjected later to coil winding by shaping disorder or the like of coils which have already been wound in the slots with a coil shaping mechanism which operates in conjunction with the winding step. Further, the method makes it possible to perform the coil winding described above at a smaller number of steps while effectively utilizing spaces, and to provide an ultra-thin type armature in which locations of a comutator and coil ends are overlapped with each other.
An invention as claimed in embodiment 3 of the present invention permits securing effective spaces in slots which are to be subjected l
Kimura Kazuo
Okamoto Manabu
Yamazaki Akihiko
Arbes Carl J.
Matsushita Electric - Industrial Co., Ltd.
Parkhurst & Wendel L.L.P.
Trinh Minh
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