Abstract:
A resolver external conductor fixing structure which includes a connection body having a plurality of leads, and a terminal pin holding part formed on a portion of an insulation cover for an annular stator. The terminal pin holding part and the connection body are configured to detachably engage to allow the leads to be disconnected during assembly of a resolver and connected when assembly is complete.

Description:
BACKGROUND OF THE INVENTION 
   1. Field of the Invention 
   The present invention relates to a resolver external conductor fixing structure, and more particularly, to a novel improvement for making a connection body with leads that are detachably connectable to a terminal pin holding part which includes terminal pins. Lead connecting portions of the terminal pins are exposed outside of the terminal pin holding part so that the leads of the connection body can be connected with the lead connecting portions after the assembly of the resolver. 
   2. Description of the Related Art 
   A conventional example of the above-mentioned type of resolver external conductor fixing structure is shown in  FIGS. 5 and 6 , and described in U.S. Pat. No. 6,028,383. 
   In  FIGS. 5 and 6 , reference numeral  1  denotes a ring-shaped stator having a plurality of salient poles  2  which protrude inwardly. First and second ring-shaped insulating covers  5  and  6 , each of which has a shape covering the respective salient poles  2 , are provided on first and second end surfaces  3  and  4  of the ring-shaped stator  1 . 
   The respective salient poles  2  are wound with stator coils  7  through the respective ring-shaped insulating covers  5  and  6 . A terminal pin holding part  8  extended in a radial direction is integrally formed in a part of an outer edge of the first ring-shaped insulating cover  5  which is one of the respective ring-shaped insulating covers  5  and  6 . 
   Each of the coil connecting parts  9   a  protruding above one end of each of terminal pins  9 , which are integrally provided in the terminal pin holding part  8  by insert molding or the like, is connected with bundled end wires of the stator coils  7 . 
   As shown in the cross sectional view of  FIG. 6 , each of the terminal pins  9  is bent into an L-shape. A lead connecting portion  10 , which includes a swaging part protruding in a lateral direction of the other end of each of the terminal pins  9 , is connected with leads  11 . The lead connecting portion  10  is tightly connected with the leads  11  by the swaging part. 
   Due to the above-described construction, the conventional resolver external conductor fixing structure has the following problems. 
   First, in a process for manufacturing the resolver, the stator is supplied to an assembly line in a state in which the leads are connected to a lead connecting portion of respective terminal pins by, for example, the application of a pressure. In a final step, after winding is completed, end wires of the stator coils are bundled and connected with the coil connecting parts. Therefore, the stator is moved on the assembly line in a state in which the leads are continuously connected with the lead connecting portion in all steps including a winding step, so that handling is inconvenient. This significantly hinders an improvement in productivity. 
   In addition, when the number of types of leads is large, it is necessary to prepare various ring-shaped stators provided with various leads based on the different lengths and types of the leads. Therefore, preparation, distinction, and the like are complicated, and the number of types of jigs in the line and the number of types of equipment attachment jigs increase. This is a large problem with respect to productivity. 
   It is very difficult to perform automatic production according to specifications based on a customer&#39;s request. 
   SUMMARY OF THE INVENTION 
   A resolver external conductor fixing structure according to the present invention includes: an insulating cover including first and second ring-shaped insulating covers formed on first and second end surfaces of a ring-shaped stator by integral molding; a terminal pin holding part integrally formed with a part of the insulating cover; a connection body which is detachable from the terminal pin holding part, and includes leads; terminal pins provided in the terminal pin holding part; a coil connecting part formed in one end of each of the terminal pins; and a lead connecting portion formed in the other end of each of the terminal pins, wherein the lead connecting portions of the terminal pins are exposed the terminal pin holding part, and the leads are connected with the lead connecting portions when the connection body is connected with the terminal pin holding part. 
   Further, in the structure, the coil connecting part is extended from a side of the first end surface of the ring-shaped stator in an axial direction; and the lead connecting portion is extended toward a side of the second end surface of the ring-shaped stator in an axial direction. Further, in the structure, each of the terminal pins is bent stepwise. Further, in the structure, an outer surface and an inner surface of each of the lead connecting portions are exposed the terminal pin holding part and can be connected with each of the leads. Further, in the structure, the lead connecting portion has a flat plane shape. Further, in the structure, the connection body comprises a plurality of lead guide holes formed therein, for guiding the leads. 
   The resolver external conductor fixing structure according to the present invention has the above-mentioned structure. Therefore, the following effects can be obtained. 
   (1) The connection body with which the leads are connected is detachable from the terminal pin holding part. The stator coils are bundled and connected with the terminal pins. In a final stage, the connection body is mounted on the terminal pin holding part to connect the leads with the lead connecting portions. Therefore, while the ring-shaped stator moves on an assembly line, the leads and the like are not connected. Thus, there is no trouble during assembly, with the result that production efficiency is improved and automation is facilitated. 
   (2) The assembly can be performed without depending on a particular type of a lead, so that the final assembly is easy and parts control is significantly facilitated. The leads are fit in a final step, so line facilities can be simplified, and changes in plan due to a change in harness can be minimized by unifying management of harness parts. 
   (3) Each of the lead connecting portions has a plate shape, so the leads can be connected with both surfaces thereof. Even after a resolver is attached to a device, the leads can be connected with the lead connecting portions. Therefore, the assembly of the device to which the resolver is attached can be significantly facilitated and simplified. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  is a plan view showing a resolver external conductor fixing structure according to the present invention. 
       FIG. 2  is a cross sectional view of the structure illustrated in  FIG. 1 . 
       FIG. 3  is an exploded perspective view of the structure illustrated in  FIG. 1  before lead connection. 
       FIG. 4  is a perspective view of the structure shown in  FIG. 1  after lead connection. 
       FIG. 5  is a plan view of a conventional resolver external conductor fixing structure. 
       FIG. 6  is a cross sectional view of the structure illustrated in  FIG. 5 . 
   

   DETAILED DESCRIPTION OF THE INVENTION 
   An object of the present invention is to provide lead connecting portions in openings of a terminal pin holding part to enable connection of leads with the lead connecting portions after stator coils are connected with terminal pins, thereby significantly improving the assembly convenience of a resolver. 
   A resolver external conductor fixing structure according to a preferred embodiment of the present invention described below with reference to the accompanying drawings. 
   In the following description, the same reference symbols are used in  FIGS. 5 and 6  are used to identify parts of the present invention which are identical or equivalent to those in the conventional example. 
   In  FIGS. 1 and 2 , reference numeral  1  denotes a ring-shaped stator having a plurality of salient poles  2  which protrude inwardly. An insulating cover  100  including first and second ring-shaped insulating covers  5  and  6 , each of which has a shape covering the respective salient poles  2 , is provided to first and second end surfaces  3  and  4  of the ring-shaped stator  1  by integral molding such as insert molding. 
   The respective salient poles  2  are wound with stator coils  7  through the respective ring-shaped insulating covers  5  and  6 . A terminal pin holding part  8  is integrally formed with the insulating cover  100  by integral molding, and extends in a radial direction from a part of an outer edge of the insulating cover  100 . 
   A plurality of terminal pins  9  which have a stepped shape are integrally provided in the terminal pin holding part  8  by insert molding or the like. Each of the coil connecting parts  9   a  is located at one end of each of the terminal pins  9 . Each of the coil connecting parts  9   a  protrudes from the first end surface  3  side in an axial direction, and is connected with each of bundled end wires of the stator coils  7 . 
   As shown in a cross sectional view of  FIG. 2 , the terminal pin  9  bent portion and a straight portion. A plate-shaped lead connecting portion  10  is extended downward from the terminal pin  9 , that is, toward the second end surface  4  side in the axial direction to a side opposed to the coil connecting part  9   a.    
   Bundled end wires of the stator coils  7  are connected with the coil connecting parts  9   a  and then fixed thereto by soldering, welding, or the like. A box-shaped connection body  101 , which includes leads  11  provided in lead guide holes  20 , is formed above the terminal pin holding part  8 . An engaging hole  110  of the connection body  101  is engaged with an engaging protrusion  111  of the terminal pin holding part  8  such that the connection body  101  is detachable from the terminal pin holding part  8 . 
   The lead connecting portion  10  of the terminal pin holding part  8  has a structure particularly developed for the present invention. Openings  21  and  22  are formed at an outer surface  10   b  and an inner surface  10   a  of the lead connecting portion  10 , so that the inner surface  10   a  and the outer surface  10   b  of the lead connecting portion  10  are exposed to an outside and formed in a flat plate shape. The openings  21  and  22  can be covered with, for example, caps which are not shown. 
   Next, assembly of a resolver using the resolver external conductor fixing structure according to the present invention will be described. 
   First, as shown in  FIG. 1 , until the end wires of the stator coils  7  are connected with the coil connecting parts  9   a  of the terminal pins  9  on an assembly line (not shown), the ring-shaped stator  1 , which is automatically assembled and in which the respective salient poles  2  wound with the stator coils  7 , is moved on the assembly line in a state in which the connection body  101  including the leads  11  is not connected with the terminal pin holding part  8 . 
   Unlike conventional structures, the resolver stator  30  described above is assembled without performing a lead  11  connecting process, and is not connected with the lead  11  on the assembly line. Therefore, handling is easy and the automation of assembly is extremely facilitated. 
   In the resolver stator  30 , after the above-mentioned assembly process is completed, the connection body  101  is mounted on the terminal pin holding part  8  in a state in which leads based on the user&#39;s specifications or, leads  11  corresponding to, for example, another harness, are inserted into the lead guide holes  20 . A jig is inserted from the opening  21  or  22 . The leads  11  are connected with and fixed to the lead connecting portion  10  by welding, soldering, or the like.