Abstract:
A motor is provided. The motor includes: a rotor; a stator inside which the rotor is rotatably disposed and including a plurality of teeth protruding toward the rotor; a plurality of insulating films disposed in respective slots formed between the plurality of teeth to insulate a coil wound around the plurality of teeth from the respective teeth; and insulating members covering upper and lower portions of the stator, respectively, wherein the plurality of insulating films are fixed by the plurality of teeth and the insulating members.

Description:
CROSS-REFERENCE TO RELATED APPLICATION(S) AND CLAIM OF PRIORITY 
       [0001]    The present application is related to and claims priority from Korean Patent Application No. 10-2016-0013657, filed on Feb. 3, 2016, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference in its entirety. 
       TECHNICAL FIELD 
       [0002]    An aspect of the exemplary embodiment relates to a motor, and more particularly, to a motor including insulating members insulating a stator. 
       BACKGROUND 
       [0003]    A motor includes a stator and a rotor, and rotates the rotor by electromagnetic force between the stator and the rotor. 
         [0004]    Generally, the stator, which has a cylindrical shape, includes a plurality of teeth protruding inwardly, and when power is applied to a coil wound around the teeth, a magnetic field is formed in the surrounding of the teeth, and the rotor disposed in the stator rotates through the magnetic field. 
         [0005]    In the related art, it has been general to insert insulating films into slots in which the coil is accommodated or couple separate insulating members, which are components having a structure corresponding to shapes of the slots, to upper and lower surfaces of the stator, respectively, to insulate the teeth and the coil wound around the teeth from each other. 
         [0006]    However, in the case of inserting the insulating films into the slots in the related art, the insulating films are separated from the slots or positions of the insulating films are changed in a process of winding the coil, such that insulation performance is deteriorated. In addition, in the case of inserting the separate insulating members into the slots in the related art, the separate insulating members should be differently manufactured depending on lengths of the slots, and an amount of the coil that may be accommodated in the slots may be reduced due to thicknesses of the insulating members themselves. 
       SUMMARY 
       [0007]    Exemplary embodiments of the present disclosure overcome the above disadvantages and other disadvantages not described above. Also, the present disclosure is not required to overcome the disadvantages described above, and an exemplary embodiment of the present disclosure may not overcome any of the problems described above. 
         [0008]    To address the above-discussed deficiencies, it is a primary object to provide a motor including insulating members facilitating insulation of a stator. 
         [0009]    According to an aspect of the present disclosure, a motor includes: a rotor; a stator inside which the rotor is rotatably disposed and including a plurality of teeth protruding toward the rotor; a plurality of insulating films disposed in the respective slots formed between the plurality of teeth to insulate a coil wound around the plurality of teeth from the respective teeth; and insulating members covering upper and lower portions of the stator, respectively, wherein the plurality of insulating films are fixed by the plurality of teeth and the insulating members. 
         [0010]    According to another aspect of the present disclosure, a motor includes: a rotor; a stator inside which the rotor is rotatably disposed and including a plurality of teeth protruding toward the rotor and a yoke connecting the plurality of teeth to an inner circumference; a plurality of insulating films covering inner peripheral surfaces of the respective slots formed between the plurality of teeth; and first and second covers covering upper and lower portions of the stator, respectively, wherein the teeth include a plurality of protrusion parts bilaterally from front ends thereof, and each of the first and second covers includes: a ring part covering the yoke; a plurality of teeth insulating parts protruding inwardly from the ring part to cover the plurality of teeth; a plurality of coil guide parts protruding from front ends of the respective teeth insulating parts in a direction that becomes distant from the front ends of the teeth, respectively; and a plurality of film fixing parts extended from both side portions of the plurality of coil guide parts toward the plurality of teeth, an inner side surface of each of the plurality of film fixing parts is disposed on an outer side than an inner side surface of the coil guide part, a portion of the inner side surface of each of the plurality of film fixing parts faces an outer side surface of the protrusion part, and upper and lower sides of both side portions of the insulating film are fitted and fixed between the inner side surface of the film fixing part and the outer side surface of the protrusion part. 
         [0011]    Before undertaking the DETAILED DESCRIPTION below, it may be advantageous to set forth definitions of certain words and phrases used throughout this patent document: the terms “include” and “comprise,” as well as derivatives thereof, mean inclusion without limitation; the term “or,” is inclusive, meaning and/or; the phrases “associated with” and “associated therewith,” as well as derivatives thereof, may mean to include, be included within, interconnect with, contain, be contained within, connect to or with, couple to or with, be communicable with, cooperate with, interleave, juxtapose, be proximate to, be bound to or with, have, have a property of, or the like; and the term “controller” means any device, system or part thereof that controls at least one operation, such a device may be implemented in hardware, firmware or software, or some combination of at least two of the same. It should be noted that the functionality associated with any particular controller may be centralized or distributed, whether locally or remotely. Definitions for certain words and phrases are provided throughout this patent document, those of ordinary skill in the art should understand that in many, if not most instances, such definitions apply to prior, as well as future uses of such defined words and phrases. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0012]    For a more complete understanding of the present disclosure and its advantages, reference is now made to the following description taken in conjunction with the accompanying drawings, in which like reference numerals represent like parts: 
           [0013]      FIG. 1  illustrates a perspective view for a motor according to various embodiments of the present disclosure; 
           [0014]      FIG. 2  illustrates an exploded perspective view of the motor illustrated in  FIG. 1  according to various embodiments of the present disclosure; 
           [0015]      FIG. 3A  illustrates a perspective view for a form in which a first cover is separated from the motor illustrated in  FIG. 1  according to various embodiments of the present disclosure; 
           [0016]      FIG. 3B  illustrates a cross-sectional view of the motor taken along line A-A′ of  FIG. 3A  according to various embodiments of the present disclosure; 
           [0017]      FIG. 3C  illustrates a cross-sectional view of the motor taken along line B-B′ of  FIG. 3A  according to various embodiments of the present disclosure; 
           [0018]      FIG. 4  illustrates an enlarged perspective view for a portion of the first cover illustrated in  FIG. 2  according to various embodiments of the present disclosure; 
           [0019]      FIG. 5  illustrates a bottom perspective view for a portion of the first cover illustrated in  FIG. 4  according to various embodiments of the present disclosure; 
           [0020]      FIG. 6  illustrates a front view for a portion of the first cover illustrated in  FIG. 4  according to various embodiments of the present disclosure; 
           [0021]      FIG. 7  illustrates a bottom view for a portion of the first cover illustrated in  FIG. 4  according to various embodiments of the present disclosure; 
           [0022]      FIG. 8  illustrates an enlarged perspective view for a portion of a form in which the first cover according to an exemplary embodiment of the present disclosure is separated from a stator according to various embodiments of the present disclosure; 
           [0023]      FIG. 9  illustrates an enlarged perspective view for a portion of a state in which the first cover illustrated in  FIG. 8  is coupled to the stator according to various embodiments of the present disclosure; 
           [0024]      FIG. 10  illustrates an external perspective view for a portion of a state in which the first cover illustrated in  FIG. 9  is coupled to the stator according to various embodiments of the present disclosure; 
           [0025]      FIG. 11  illustrates a side view for a portion of the state in which the first cover illustrated in  FIG. 9  is coupled to the stator according to various embodiments of the present disclosure; and 
           [0026]      FIG. 12  illustrates a side view for a portion of a state in which a coil is wound around the stator illustrated in  FIG. 11  according to various embodiments of the present disclosure. 
       
    
    
     DETAILED DESCRIPTION 
       [0027]      FIGS. 1 through 12 , discussed below, and various embodiments used to describe the principles of the present disclosure in this patent document are by way of illustration only and should not be construed in any way to limit the scope of the disclosure. Those skilled in the art will understand that the principles of the present disclosure may be implemented in any suitably arranged electronic device. 
         [0028]    Hereinafter, exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Exemplary embodiments to be described below will be described on the basis of exemplary embodiments most appropriate for understanding technical features of the present disclosure, and these exemplary embodiments do not limit the technical features of the present disclosure, but exemplify that the present disclosure may be implemented like these exemplary embodiments. 
         [0029]    Therefore, the present disclosure may be variously modified without departing from the technical scope of the present disclosure through exemplary embodiments to be described below, and these modifications will be to fall within the technical scope of the present disclosure. In addition, in order to assist in the understanding of exemplary embodiments to be described below, components performing the same operations and related components in the respective exemplary embodiments will be denoted by the same or similar reference numerals throughout the accompanying drawings. 
         [0030]    In addition, for convenience of explanation, an inner side refers to a side close to a shaft of a rotor configuring a motor according to an exemplary embodiment of the present disclosure, and an outer side refers to a side distant from the shaft. 
         [0031]      FIG. 1  is a perspective view illustrating a motor  1  according to an exemplary embodiment of the present disclosure, and  FIG. 2  is an exploded perspective view of the motor  1 . 
         [0032]    Referring to  FIGS. 1 and 2 , the motor  1  may include a rotor  20 , a stator  40 , insulating members  10  and  10 ′ covering upper and lower portions of the stator  40 , respectively, and a plurality of insulating films  30 . 
         [0033]    The insulating members  10  and  10 ′ may include a first cover  10  covering the upper portion of the stator  40  and a second cover  10 ′ covering the lower portion of the stator  40 . 
         [0034]    The stator  40 , which has a cylindrical shape including a hollow in which the rotor  20  may rotate, may be formed by stacking a plurality of steel plates. In addition, the stator  40  may include a plurality of teeth  410  protruding inwardly from an inner peripheral surface thereof toward the rotor  20 , and an annular yoke  420  connecting the plurality of teeth  410  to each other. 
         [0035]    The teeth  410  may include a plurality of protrusion parts  411  protruding bilaterally from front ends thereof. As described above, the protrusion parts  411  protrude from the front ends of the teeth  410 , such that an area in which front end surfaces  410   a  of the teeth  410  and an outer peripheral surface of the rotor  20  may face each other may be increased. Therefore, an interaction between the stator  40  and the rotor  20  by electromagnetic force between the stator  40  and the rotor  20  may be increased. 
         [0036]    In addition, slots S corresponding to spaces in which a coil (not illustrated) wound around the teeth  410  may be accommodated may be formed between the plurality of teeth  410 . The slots S may vertically penetrate through the stator  40 . 
         [0037]    In addition, the plurality of insulating films  30  may be inserted into a plurality of slots S, respectively, to cover inner peripheral surfaces of the slots S, thereby insulating the coil wound around the teeth  410  and side portions of the teeth  410  forming the slots S from each other. 
         [0038]    The insulating film  30  may be formed of a material having an electrical insulation property, such as plastic, rubber, or the like. In addition, the insulating film  30  is formed of one insulating film  30  having elasticity, such that it is inserted into the slot S in a state in which it is bent in a shape corresponding to that of the slot S, thereby making it possible to cover the inner peripheral surface of the slot S. 
         [0039]    In addition, the insulating film  30  may have a thickness of 0.1 mm to 0.5 mm, which is thinner than those of the insulating member  10  and  10 ′. Therefore, even though the insulating film  30  covers the inner peripheral surface of the slot S, a volume occupied by the insulating film  30  may be very small as compared with a size of the slot S. Therefore, even though the insulating film  30  is inserted into the slot S, an amount of the coil that may be accommodated in the slot S may become relatively larger than that in a method according to the related art in which a plastic injection molding product is directly inserted into the slot S to cover the inner peripheral surface of the slot S. 
         [0040]    The rotor  20  may be disposed in the hollow formed in the stator  40  to rotate around a shaft. In addition, the front end surfaces  410   a  of the plurality of teeth  410  annularly disposed in the stator  40  may partition the hollow in which the rotor  20  may rotate, and a gap corresponding to a predetermined interval for rotation of the rotor  20  may be formed between the front end surfaces  410   a  of the teeth  410  and the outer peripheral surface of the rotor  20 . 
         [0041]    As described above, the protrusion parts  411  of the teeth  410  may extend an area in which the teeth  410  and the outer peripheral surface of the rotor  20  face each other to increase a magnitude of electromagnetic force applied to the rotor  20 . 
         [0042]    As described above, the first cover  10  may cover the upper portion of the stator  40 , and the second cover  10 ′ may cover the lower portion of the stator  40 . 
         [0043]    The first and second covers  10  and  10 ′ may include a plurality of teeth insulating parts  110  and  110 ′, a plurality of coil guide parts  120  and  120 ′, a plurality of film fixing parts  130  and  130 ′, and ring parts  140  and  140 ′, respectively. 
         [0044]    The first and second covers  10  and  10 ′ may be formed of a material having an electrical insulation property to insulate the teeth  410  from the coil, and may be injection molding products manufactured by molding a resin of an insulator such as plastic. In addition, the plurality of teeth insulating parts  110  and  110 ′, the plurality of coil guide parts  120  and  120 ′, the plurality of film fixing parts  130  and  130 ′, and the ring parts  140  and  140 ′ may be formed integrally with one another, respectively. 
         [0045]    The respective ring parts  140  and  140 ′ may have an annular shape corresponding to shapes of upper and lower portions of the yoke  420 , and the plurality of teeth insulating parts  110  and  110 ′ may protrude from inner circumferences of the respective ring parts  140  and  140 ′, respectively, along shapes of the teeth  410 . Therefore, the teeth insulating parts  110  and  110 ′ may cover upper and lower portions of the teeth  410 , respectively. 
         [0046]    The first and second covers  10  and  10 ′ may include the plurality of coil guide parts  120  and  120 ′ protruding from front ends of the teeth insulating parts  110  and  110 ′ in a direction that becomes distant from the teeth  410  and the plurality of film fixing parts  130  and  130 ′ each coupled to both sides of the respective coil guide parts  120   a  and  120 ′, respectively. Detailed components of the first and second covers  10  and  10 ′ will be described in detail below. 
         [0047]      FIG. 3A  is a perspective view illustrating a form in which a first cover  10  is separated from the motor  1  illustrated in  FIG. 1 , and  FIGS. 3B and 3C  are, respectively, cross-sectional views of the motor  1  taken along line A-A′ and line B-B′ of  FIG. 3A . 
         [0048]    Since a structure and a shape of the second cover  10 ′ are substantially the same as those of the first cover  10 , an overlapping description for the second cover  10 ′ will hereinafter be replaced by a description for the first cover  10 . 
         [0049]    Referring to  FIG. 3A , the ring part  140  may include a plurality of coupling protrusions  141  formed on a lower surface thereof and protruding downwardly toward the stator  40 , and a plurality of coupling grooves  41  may be formed in an upper portion of the stator  40  corresponding to the coupling protrusions  141 . In detail, the plurality of coupling grooves  41  formed in the stator  40  may be disposed in an upper portion of the yoke  420 . 
         [0050]    Therefore, the plurality of coupling protrusions  141  are inserted into the plurality of coupling grooves  41 , respectively, such that the first cover  10  including the ring part  140  may be coupled to the upper portion of the yoke  420 . 
         [0051]    In addition, the plurality of coupling grooves  41  are formed on the yoke  420  spaced apart from the front ends of the teeth  410  forming electromagnetic force with the rotor  20 , such that interference of a magnetic field by the coupling grooves  41  may be prevented. Therefore, a decrease in efficiency of the motor  1  may be prevented. 
         [0052]    In addition, the ring part  140 ′ of the second cover  10 ′ may also include a plurality of coupling protrusions  141 ′ formed on a lower surface thereof, and a plurality of coupling grooves  41 ′ into which the plurality of coupling protrusions  141 ′ are inserted, respectively, may be formed in a lower portion of the yoke  420 . 
         [0053]    As illustrated in  FIGS. 3A to 3C , the insulating film  30  inserted into the slot S may include a first surface  31  contacting an inner peripheral surface of the yoke  420 , a plurality of second surfaces  32  bent from the first surface  31  along teeth  410  disposed at both sides of the insulating film  30 , and a plurality of third surfaces  33  bent from the respective second surfaces  32  along outer side surfaces  411   b  (see  FIG. 11 ) of the protrusion parts  411 . The plurality of third surfaces  33  may configure both side portions of the insulating film  30 . 
         [0054]    In addition, both side portions of the insulating film  30  may be spaced apart from each other by a predetermined clearance, and the coil may be wound around the teeth  410  through clearances between third surfaces  33  adjacent to each other. 
         [0055]    A bent shape of the insulating film  30  covering the inner peripheral surface of the slot S may be various modified depending on a shape of the inner peripheral surface of the slot S formed depending on shapes of the yoke  420 , the teeth  410 , and the protrusion parts  411 . 
         [0056]    In addition, the plurality of third surfaces  33  configuring both side portions of the insulating film  30  may be fitted and fixed between the respective film fixing parts  130  and  130 ′ of the first and second covers  10  and  10 ′ and the protrusion parts  411  of the teeth  410 . Fixing of the insulating films  30  through the first and second covers  10  and  10 ′ will be described in detail below. 
         [0057]    As illustrated in  FIGS. 3A to 3C , an upper end and a lower end of the insulating film  30  may protrude upwardly and downwardly from an opening of the slot S. Therefore, the upper end and the lower end of the insulating film  30  may further protrude as compared with an upper surface and a lower surface of the stator  40 , respectively. To this end, the insulating film  30  may be formed at a height greater than that of the slot S. 
         [0058]    In addition, the respective ring parts  140  and  140 ′ of the first and second covers  10  and  10 ′ may include a plurality of engaging members  142  and  142 ′ protruding inwardly toward the slots S, respectively. An upper end  31   a  and a lower end  31 ′ a  of the first surface  31  protruding upwardly and downwardly of the slot S may overlap the engaging members  142  and  142 ′, respectively. 
         [0059]    As described above, the upper end  31   a  and the lower end  31 ′ a  of the first surface  31  of the insulating film  30  overlap the engaging members  142  and  142 ′ of the first and second covers  10  and  10 ′, respectively, such that the insulating film  30  may be fixed without vertically moving within the slot S. 
         [0060]    In addition, as illustrated in  FIG. 3A , the engaging member  142  may have an engaging protrusion shape surrounding the inner circumference of the ring part  140  or may have a protrusion shape in which a portion of the inner circumference of the ring part  140  protrudes. 
         [0061]      FIGS. 4 to 7  are, respectively, an enlarged perspective view, a bottom perspective view, a front view, and a bottom view illustrating a portion of the first cover  10  illustrated in  FIG. 2 . 
         [0062]    Detailed components of the first cover  100  will hereinafter be described in detail with reference to  FIGS. 4 to 7 . In addition, the first cover  10  and the second cover  10 ′ have substantially the same shape and configuration except that they are coupled to the stator  40  in opposite directions. Therefore, a structure of the first cover  10  coupled to the upper portion of the stator  40  will hereinafter be mainly described, but a description for contents overlapping contents of the first cover  10  in a description for the second cover  10 ′ coupled to the lower portion of the stator  40  will be replaced by the description for the first cover  10 . 
         [0063]    As described above, the plurality of teeth insulating parts  110  protruding inwardly from the inner circumference of the ring part  140  are coupled to the ring part  140  of the first cover  10 . The respective teeth insulating parts  110  may have shapes corresponding to those of upper surfaces of the teeth  410  to cover the plurality of teeth  410  corresponding to the teeth insulating parts  110 , thereby making it possible to cover the plurality of teeth  410 . 
         [0064]    In addition, the plurality of coil guide parts  120  and  120 ′ protruding from front ends of the teeth insulating parts  110  in the direction that becomes distant from the teeth  410  may be coupled to the front ends of the teeth insulating parts  110 . The coil guide part  120  may be coupled to an upper end of the teeth insulating part  110 , and may protrude upwardly from the teeth insulating part  110  to be thus spaced apart from the upper surface of the tooth  410  by a predetermined interval. 
         [0065]    As described above, the coil guide part  120  protrudes upwardly from the teeth insulating part  110  to become distant from the tooth  410 , thereby making it possible to support the coil wound around the tooth  410 . 
         [0066]    In detail, as an amount of the coil wound around the tooth  410  is increased, the coil may protrude outwardly of the slot S, and the coil protruding outwardly of the slot S may be separated inwardly from the tooth  410  toward the rotor  20 . Therefore, the coil protruding outwardly of the slot S interferes with the coil guide part  120  protruding from the teeth insulating part  110 , thereby making it possible to prevent the wound coil from being separated from the tooth  410 . 
         [0067]    In addition, a shape of a low end of the coil guide part  120  may correspond to that of a front end of the tooth  410  including the protrusion parts  411  to efficiently support the coil wound around the tooth  410 . Therefore, the lower end of the coil guide part  120  may face the front end of the tooth  410 , and both side portions  121  of the coil guide part  120  may face upper surfaces  411   a  of the protrusion parts  411 . 
         [0068]    In addition, as illustrated in  FIGS. 4 to 8 , the coil guide part  120  may have a shape in which it protrudes bilaterally in relation to the teeth insulating part  110  to support a larger amount of coil. In detail, a width of the coil guide part  120  may be greater than that of the teeth insulating part  110 . Therefore, both side portions  121  of the coil guide part  120  may protrude bilaterally in relation to the teeth insulating part  110 . 
         [0069]    In addition, the coil guide part  120  may be formed so that a width of an inner side surface  120   a  thereof is greater than that of a front end surface  111  of the teeth insulating part  110  to efficiently support the coil wound around the tooth  410 . For example, the inner side surface  120   a  of the coil guide part  120  may have an arch shape corresponding to that of the wound coil. 
         [0070]    The plurality of film fixing parts  130  may be coupled to both side portions  121  of the coil guide part  120 , respectively. 
         [0071]    The plurality of film fixing parts  130  may be extended downwardly from the coil guide part  120  toward the tooth  410 , and may be coupled to lower ends of both side portions  121  of the coil guide part  120 , respectively. 
         [0072]    In addition, the plurality of film fixing parts  130  may be disposed at both sides of the teeth insulating part  110 , respectively, and are formed at a height H 2  higher than a height H 1  of the teeth insulating part  110 , as illustrated in  FIG. 6 , such that lower ends of the film fixing parts  130  may be disposed on a level below a lower end of the teeth insulating part  110  to be closer to the teeth  410  as compared with the lower end of the teeth insulating part  110 . 
         [0073]    In addition, as illustrated in  FIGS. 4 and 5 , an inner side surface  131  of the film fixing part  130  may be disposed on an outer side than an inner side surface  120   a  of the coil guide part  120 . Therefore, the respective lower surfaces  121   a  of both side portions  121  of the coil guide part  120  may be connected to the inner side surfaces  131  of the respective film fixing parts  130 , and the respective lower surfaces  121   a  of both side portions  121  of the coil guide part  120  and the inner side surfaces  131  of the respective film fixing parts  130  may partition an interference preventing space R opened inwardly toward the rotor  20 . 
         [0074]    The interference preventing space R is configured to prevent the rotor  20  and the coil guide part  120  from interfering with each other even though both side portions  121  of the coil guide part  120  are curved inwardly by winding the coil around the tooth  410 , and will be described in detail below with reference to  FIGS. 11 and 12 . 
         [0075]    As illustrated in  FIGS. 6 and 7 , a side surface  112  of the teeth insulating part  110  and one end  132  of the film fixing part  130  may be spaced apart from each other by a predetermined clearance to form a gap G. The gap G may correspond to a thickness of the insulating film  30 . For example, the gap G may be one to three times larger than the thickness of the insulating film. Therefore, a portion of the insulating film  30  is fitted into the gap G, such that the insulating film  30  may be fixed without horizontally moving by the gap G. 
         [0076]    In addition, as illustrated in  FIG. 6 , a lower end of the film fixing part  130  may have an inclined surface  133  inclined from one end  132  of the film fixing part  130  toward the tooth  410 . The inclined surface  133  may guide the insulating film  30  to easily fit the insulating film  30  into the gap G. 
         [0077]      FIG. 8  is an enlarged perspective view illustrating a portion of a form in which the first cover  10  is separated from a stator  40 . In addition,  FIGS. 9 to 11  are, respectively, a perspective view, an external perspective view, and a side view illustrating a portion of a state in which the first cover i 10  is coupled to the stator  40 . 
         [0078]    A method of fixing the insulating film  30  by the first cover  100  will hereinafter be described in detail with reference to  FIGS. 8 to 11 . 
         [0079]    As described above, the plurality of film fixing parts  130  may be extended from both side portions  121  of the coil guide part  120  toward the tooth  410 , and may be disposed at both sides of the teeth insulating part  110 , respectively. 
         [0080]    In addition, the inner side surface  131  of the film fixing part  130  may be disposed in an outer side than the inner side surface  120   a  of the coil guide part  120 , and the lower end of the film fixing part  130  may be disposed on the level below the lower end of the teeth insulating part  110 . Therefore, one end of the film fixing part  130  may be inserted into the slot S in a state in which the first cover  10  is coupled to the upper portion of the stator  40 . 
         [0081]    Therefore, the inner side surfaces  131  of the film fixing parts  130  inserted into the slot S may face the outer side surfaces  411   b  of the protrusion parts  411  at an interval corresponding to the thickness of the insulating film  30 . In addition, the inner side surfaces  131  of the film fixing parts  130  overlap the outer side surfaces  411   b  of the protrusion parts  411 , such that the film fixing parts  130  may be supported by the outer side surfaces  411   b  of the protrusion parts  411 . 
         [0082]    Therefore, upper sides of the third surfaces  33  of the insulating film  30  covering the outer side surfaces  411   b  of the protrusion parts  411  may overlap the inner side surfaces  131  of the film fixing parts  130 . As a result, the upper sides of the third surfaces  33  of the insulating films  30  may be fitted and fixed between the outer side surfaces  411   b  of the protrusion parts  411  and the inner side surfaces  131  of the film fixing parts  130 . 
         [0083]    The upper sides of the plurality of third surfaces  33  positioned at both side portions of one insulating film  30  inserted into the slot S may be fitted and fixed between the protrusion parts  411  and the film fixing parts  130 , respectively, such that the insulating film  30  may be firmly fixed without horizontally moving in the slot S. 
         [0084]    In addition, the film fixing parts  130  may be extended toward a central portion of the slot S in a length direction of the slot S. Therefore, portions of the film fixing parts  130  overlapping the insulating film  30  may be increased to more firmly fix the insulating film  30  in the slot S. 
         [0085]    As illustrated in  FIGS. 9 and 10 , the insulating film  30  is bent along the inner peripheral surface of the slot S, such that bent parts  301  bent from side surfaces of the tooth  410  along the outer side surfaces  411   b  of the protrusion parts  411  may be formed. In detail, the bent parts  301  may be formed between the second surfaces  32  and the third surfaces  33  of the insulating film  30 . 
         [0086]    In addition, the bent part  301  may be fitted and fixed into the gap G formed between the side surface  112  of the teeth insulating part  110  and one end  132  of the film fixing part  130 . As described above, since the gap G corresponds to the thickness of the insulating film  30 , the insulating film  30  may be more firmly fixed in the slot S due to the bent part  301  fitted into the gap G. 
         [0087]    In detail, the side surface  112  of the teeth insulating part  110  and one end  132  of the film fixing part  130  configuring the gap G may press the bent part  301  of the insulating film  30  to prevent the insulating film  30  to horizontally move along the inner peripheral surface of the slot S in relation to the bent part  301 , and the bent part  301  may be easily coupled into the gap G along the inclined surface  133  of the film fixing part  130  described above. 
         [0088]    The upper end and the lower end of the insulating film  30  may protrude upwardly and downwardly from the opening of the slot S, as described above. 
         [0089]    In addition, as illustrated in  FIGS. 9 and 11 , upper ends  33   a  of the third surfaces  33  of the insulating film  30  protruding upwardly of the slot S may overlap the lower surfaces  121   a  of both side portions  121  of the coil guide part  120 . 
         [0090]    To this end, the insulating film  30  may protrude upwardly of the slot S by the height of the teeth insulating part  110 . Therefore, the upper ends  33   a  of the third surfaces  33  may overlap the lower surfaces  121   a  of both side portions  121  of the coil guide part  120  disposed on the teeth insulating part  110 . 
         [0091]    In addition, lower ends of the third surfaces  33  of the insulating film  30  protruding downwardly of the slot S may also overlap lower surfaces  121 ′ a  of both side portions  121 ′ of the coil guide part  120 ′. Therefore, the insulating film  30  may be vertically fixed between the first and second covers  10  and  10 ′. 
         [0092]    As described above, the lower surfaces  121   a  of both side portions  121  of the coil guide part  120  may overlap the upper ends  33   a  of the third surfaces  33  to vertically firmly fix the insulating film  30  together with the engaging member  142  of the ring part  140  in the slot S. 
         [0093]      FIG. 12  is a side view illustrating a portion of a state in which a coil is wound around the stator illustrated in  FIG. 11 . 
         [0094]    A configuration of the coil guide part  120  that does not interfere with the rotor  20  even though both side portions  121  of the coil guide part  120  are curved inwardly by winding the coil  50  around the tooth  410  will hereinafter be described with reference to  FIGS. 11 and 12 . 
         [0095]    The coil guide part  120  may be manufactured at an appropriate thickness as long as it may support the coil  50 . As an example, the coil guide part  120  may be manufactured at a minimized thickness. Therefore, a decrease in an amount of the coil  50  wound around the tooth  410  due to the thickness of the coil guide part  120  may be prevented. 
         [0096]    In addition, since the coil guide part  120  supports the coil  50  so that the coil  50  wound around the tooth  410  is not separated inwardly, pressure may be applied from the wound coil  50  to the coil guide part  120  in an inward direction. 
         [0097]    However, in the case in which the pressure applied from the wound coil  50  to the coil guide part  120  becomes large, both sides of the coil guide part  120  are spaced apart from the front end of the teeth insulating part  110  supporting the coil guide part  120 , such that they may be curved inwardly by the pressure of the coil  50 . In detail, as illustrated in  FIG. 12 , both side portions  121  of the coil guide part  120  protruding bilaterally may be curved inwardly. 
         [0098]    In addition, the rotor  20  performs a rotation motion in the hollow of the stator  40 , and may vertically move in the slot S by a predetermined interval at the time of the rotation motion, and as illustrated in  FIGS. 11 and 12 , an upper surface  20   a  of the stator  40  protrudes upwardly of the slot S, such that the upper surface  20   a  of the stator  40  may be positioned on a level above the upper surface  411   a  of the protrusion part  411 . 
         [0099]    Even though both side portions  121  of the coil guide part  120  are curved inwardly by the pressure of the coil  50 , the coil guide part  120  is spaced from the front end of the tooth  410  by a predetermined interval. As a result, even though the rotor  20  protrudes upwardly of the slot S, interference between the rotor  20  and the coil guide part  120  may be prevented. 
         [0100]    In detail, the lower surfaces  121   a  of both side portions  121  of the coil guide part  120  may be disposed on a level above the upper end  20   a  of the rotor  20  moving upwardly in the slot S, and even though the coil guide part  120  is curved, the interference between the rotor  20  and the curved coil guide part  120  may be prevented by the interference preventing space R partitioned by the lower surfaces  121   a  of both side portions  121  of the coil guide part  120  and the inner side surfaces  131  of the film fixing parts  130 . Therefore, a decrease in efficiency of the motor  1  may be prevented. 
         [0101]    In addition, even though the pressure is applied from the coil to both side portions  121  of the coil guide part  120 , the film fixing parts  130  coupled to the lower end of the coil guide part  120  may overlap the protrusion parts  411  to support both side portions  121  of the coil guide part  120 . Therefore, the film fixing parts  130  may prevent both side portions  121  of the coil guide part  120  from being curved inwardly. 
         [0102]    Although structures of the teeth insulating parts  110 , the coil guide parts  120 , the film fixing parts  130 , and the ring part  140  of the first cover  10  coupled to the upper portion of the stator  40  have been mainly described hereinabove, structures of the teeth insulating parts  110 ′, the coil guide parts  120 ′, the film fixing parts  130 ′, and the ring part  140 ′ of the second cover  10 ′ are the same as those of the teeth insulating parts  110 , the coil guide parts  120 , the film fixing parts  130 , and the ring part  140  of the first cover  10  except that the second cover  10 ′ is coupled to the lower portion of the stator  40  in an opposite direction to a direction in which the first cover  10  is coupled to the upper portion of the stator  40 , and a description for the second cover  10 ′ that may overlap the detailed description for the first cover  10  will be replaced by the detailed description for the first cover  10 . 
         [0103]    Although various exemplary embodiments of the present disclosure have been individually described hereinabove, the respective exemplary embodiments are not necessarily implemented singly, but may also be implemented so that configurations and operations thereof are combined with those of one or more other exemplary embodiments. 
         [0104]    Although the present disclosure has been described with an exemplary embodiment, various changes and modifications may be suggested to one skilled in the art. It is intended that the present disclosure encompass such changes and modifications as fall within the scope of the appended claims.