Abstract:
A stator device in a motor includes a magnetism guiding part, a magnetizing part, a coil seat, a circuit board and a support part. The magnetism guiding part has a split opening straightly extending along the length thereof and a projection is provided at a specific spot of the circumferential edges of the central through holes of the magnetizing part, the coil seat and the circuit board respectively to engage with the split opening. A stem extends upward from the support part to fit with the inner wall surface of the magnetism guiding part.

Description:
BACKGROUND OF THE INVENTION 
   1. Field of the Invention 
   The present invention is related to a stator device of a motor and fabrication method thereof and particularly to a joining structure of a magnetism guiding part in the stator device. 
   2. Brief Description of the Related Art 
   Referring to  FIGS. 1 and 2 , a conventional stator device of a motor includes a magnetism guiding part  11 , a magnetizing part  12 , a coil  13 , a circuit board  14  and a support  15 . The coil  13  is wound on the coil seat  131  and the magnetizing part  12  is composed of an upper electrode plate  121  and a lower electrode plate  122 . The magnetism guiding part  11 , the upper electrode plate  121 , the lower electrode plate  122 , the coil  131  and the circuit board  14  are provided with a through hole ( 111 ,  121   a ,  122   a ,  131   a  and  141 ) respectively and the magnetism guiding part  11  is joined to the through holes ( 121   a ,  122   a ,  131   a  and  141 ) and fits with a through hole  151  of the support part  15 . 
   When the preceding stator device is set up, the magnetism guiding part  11  joined to the upper electrode plate  121 , the coil seat  131 , the lower electrode plate  122 , the circuit board  14  and the support part  15  sequentially by way of being joined to the through holes ( 121   a ,  122   a ,  131   a ,  141  and  151 ) respectively. The coil seat  131  is disposed between the upper electrode plate  121  and the lower electrode plate  122  in a way of the circumferential side of the upper electrode plate  121  being alternate to the circumferential side of the lower electrode plate  122 . 
   However, the conventional stator device has the following shortcomings:
         (1) It is required for the magnetism-guiding cylinder  11  to tightly fit with the through holes ( 121   a ,  122   a ,  131   a ,  141  and  151 ) such that it is incapable of being fixed accurately in case of no locating holes  121   b  at the upper electrode plate  121  and locating holes  122   b ,  122   c  at the lower electrode plate  122  being provided and no locating projections  131   b  on the coil seat  131  corresponding to the locating holes  121   b ,  122   b  and locating projections  142  on the circuit board corresponding to the locating holes  122   c  being provided. The upper electrode plate  121  and the lower electrode plate  122  can be located in a way of alternating to each other due to the locating holes  121   b ,  122   b  fitting with the locating projections  131   b  and the circuit board is located accurately due to the locating holes  122   c  fitting with the locating projections  142 . In the meantime, a sensor  143  attached to the circuit board  14  can be disposed to pair with the upper and lower electrode plates  121 ,  122  once the circuit board is accurately located. However, it is often that the locating projections  131   b  detach from the locating holes  121   b ,  122   b  and, normally, it is more inconvenient to attach the locating projections  131   b  to the locating holes  121   b ,  122   b.      (2) The magnetism-guiding cylinder  11  is hollow so that and it is easy to occur eddy current loss.   (3) The locating holes  121   b  of the upper electrode plate  121  and locating holes  122   b  and  122   c  of the lower electrode plate  122  are easy to occur flux loss.       

   SUMMARY OF THE INVENTION 
   An object of the present invention is to provide a stator device of a motor for lessening eddy current loss. 
   Another object of the present invention is to provide a stator device of a motor, which is assembled conveniently. 
   A further object of the present invention is to provide a stator device of a motor with which the parts thereof are capable of being accurately located quickly. 
   A further object of the present invention is to provide a stator device of a motor with which the flux loss is capable of being lessened. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The detail structure, the applied principle, the function and the effectiveness of the present invention can be more fully understood with reference to the following description and accompanying drawings, in which: 
       FIG. 1  is an exploded perspective view of the conventional stator device in a motor; 
       FIG. 2  is an assembled perspective view of the conventional stator device in a motor; 
       FIG. 3  is an exploded perspective view of the first embodiment of a stator device in a motor according to the present invention; 
       FIG. 4  is an assembled perspective view of the first embodiment of a stator device in a motor according to the present invention; 
       FIG. 5  is a plan view illustrating the first process of the guide magnetic part in the stator device of the present invention being worked; 
       FIG. 6  is a plan view illustrating the second process of the guide magnetic part in the stator device of the present invention being worked; 
       FIG. 7  is a plan view illustrating the third process of the guide magnetic part in the stator device of the present invention being worked; 
       FIG. 8  is a plan view illustrating the fourth process of the guide magnetic part in the stator device of the present invention being worked; 
       FIG. 9  is a plan view of the finished guide magnetic part used in the stator device of the present invention; 
       FIG. 10  is an exploded perspective view of the second embodiment of a stator device in a motor according to the present invention; and 
       FIG. 11  is an assembled perspective view of the second embodiment of the present invention. 
   

   DETAILED DESCRIPTION OF THE INVENTION 
   Referring to  FIGS. 3 and 4 , the first embodiment of a stator device in a motor according to the present invention is illustrated. The stator device in the first embodiment of the present invention comprises a magnetism guiding part  21 , a magnetizing part  22 , a coil  23 , a circuit board  24  and a support part  25 . The coil  23  is wound on a coil seat  231  and the magnetizing part  22  is composed of an upper electrode plate  221  and a lower electrode plate  222 . The magnetism guiding part  21 , the upper electrode plate  221 , the lower electrode plate  222 , the coil  231  and the circuit board  24  are provided with a through hole ( 211 ,  221   a ,  222   a ,  231   a  and  241 ) respectively and the magnetism guiding part  21  has a split opening  211   a . The magnetism guiding part  21  passes through the through holes ( 221   a ,  222   a ,  231   a  and  241 ) and fits with a stem  251  projecting from the support part  25 . 
   When the stator device of the present invention is set up, the magnetism guiding part  21  is joined to the upper electrode plate  221 , the coil seat  231 , the lower electrode plate  222  and the circuit board  24  sequentially by way of passing through the through holes ( 221   a ,  222   a ,  231   a  and  241 ) respectively. The coil seat  231  is disposed between the upper electrode plate  221  and the lower electrode plate  222  in a way of the circumferential side of the upper electrode plate  221  being alternate to the circumferential side of the lower electrode plate  222 . Further, a sensor  242  on the circuit board  24  is disposed between the upper electrode plate  221  and the lower electrode plate  222  so as to pair with the upper and lower electrode plates ( 221 ,  222 ). Finally, the through hole  211  of the magnetism guiding part  21  is joined to the stem  251  of the support part  25 . It is advantageous that the stator device of the present invention is capable of avoiding eddy current loss. 
   Referring to  FIGS. 5 ,  6 ,  7 ,  8  and  9 , the preferred embodiment of a fabrication device of the magnetism guiding part is illustrated and the fabrication device includes at least two locating mechanisms  261  such as rolls, at least two forming mechanisms  262  such as rolls and a plate member  263  made of magnetism guiding material. The plate member  263  is held and fed by the locating mechanisms  261  till the plate member  283  touching the forming mechanisms  262 . The plate member  262  is bent and wrapped by the forming mechanisms  262  continuously till a cylinder  264  with a split opening is formed as shown in  FIG. 9 . 
   Referring to  FIGS. 10 and 11 , the second preferred embodiment of a stator device in a motor according to the present invention is illustrated. The stator device in the second embodiment of the present invention comprises a magnetism guiding part  31 , a magnetizing part  32 , a coil  33 , a circuit board  34  and a support part  35 . The coil  33  is wound on a coil seat  331  and the magnetizing part  32  is composed of an upper electrode plate  321  and a lower electrode plate  322 . The magnetism guiding part  31 , the upper electrode plate  321 , the lower electrode plate  322 , the coil  331  and the circuit board  34  are provided with a through hole ( 311 ,  321   a ,  322   a ,  331   a  and  341 ) respectively and the magnetism guiding part  31  has a split opening  311   a . The magnetism guiding part  21  passes through the through holes ( 321   a ,  322   a ,  331   a  and  341 ) and fits with a stem  351  projecting from the support part  35 . 
   Wall surfaces of both the through holes  321   a ,  322   a  in the upper electrode  321  and the lower electrode  322  have a projection ( 321   b ,  322   b ) respectively. The wall surfaces of the through holes  331   a  and  341   a  in the coil seat  331  and the circuit board  34  have a projection ( 331   b ,  341   a ) respectively. Hence, the projections  321   b ,  322   b ,  331   b ,  341   a  are inserted into the split opening  311   a  of the magnetism guiding part  31 . 
   When the preceding second embodiment of the stator device in a motor is set up, the magnetism guiding part  31  joined to the upper electrode plate  321 , the coil seat  331 , the lower electrode plate  322  and the circuit board  34  sequentially by way of passing through the through holes ( 321   a ,  322   a ,  331   a  and  341 ) respectively and the split opening  311   a  of the magnetism guiding part  31  engaging with the projections  321   b ,  331   b ,  322   b ,  341   a . The coil seat  331  is disposed between the upper electrode plate  321  and the lower electrode plate  322  in a way of the circumferential side of the upper electrode plate  321  being alternate to the circumferential side of the lower electrode plate  322 . Further, a sensor  342  on the circuit board  34  is disposed between the upper electrode plate  321  and the lower electrode plate  322  so as to pair with the upper and lower electrode plates ( 321 ,  322 ). Finally, the through hole  311  of the magnetism guiding part  31  is joined to the stem  351  of the support part  35 . It is advantageous that the stator device of the present invention is capable of avoiding eddy current loss and magnetic flux decrease and obtaining effect of fast locating and convenient assembling. 
   As the forgoing, the stator device in a motor according to the present invention has the following advantages:
         1. The split opening  311   a  of the magnetism guiding part  31  engages with the projections ( 321   b ,  331   b ,  322   b ,  341   a ) at the through holes ( 321   a ,  331   a ,  322   a,   341 ) of the upper plates  321 , the coil seat  331 , the lower plates  322  and the circuit board  34  respectively so that not only effect of fast locating and not easily releasing can be obtained but also convenient assembling and magnetic flux decrease can be reached.   2. The split opening ( 211   a ,  311   a ) of the magnetism guiding part  21 ,  31  is capable of preventing eddy current loss.       

   While the invention has been described with referencing to preferred embodiments thereof, it is to be understood that modifications or variations may be easily made without departing from the spirit of this invention, which is defined by the appended claims.