JP5790454B2 - Method of fixing coil to teeth and fixing structure of teeth and coil - Google Patents

Description

  The present invention relates to a method of arranging and fixing a coil around teeth of a stator core and a structure for fixing the tooth and the coil.

  A stator that constitutes a motor (electric motor) includes a steel plate laminate or a dust magnet including an annular yoke, a plurality of teeth protruding radially inward from the yoke, and a slot formed between adjacent teeth. It is mainly composed of a stator core made of a core and a coil formed around the teeth.

  Here, the coil conductor is generally circular in cross section, and for example, a conductor made of a copper material and an insulating film formed around it is applied (this coil is called a round wire). In order to improve the space factor, for example, a coil in which an insulating film is formed around a rectangular copper wire is wound edgewise.

  By the way, as a method of forming a coil around the teeth, there is a method of fitting a coil in which a coil is formed by winding a conducting wire in advance from the tip (rotor side) of the teeth. In this method, since both of them are fixed by simply fitting a pre-formed coil into the teeth, the coil forming efficiency around the teeth is extremely high. However, in order to fit the coil smoothly from the tip of the tooth, it is not possible to provide a hook to prevent the coil from falling off at the tip of the tooth, and therefore it is possible to guarantee a smooth fit of the coil into the tooth. The problem is that the coil is removed from the tip of the tooth.

  On the other hand, as another method of forming a coil around the teeth, a split is formed by dividing the coil into two pieces by providing hooks for preventing the coil from coming off at the tip of the teeth and projecting to the left and right slots. There is a method in which a coil is formed by fitting a coil from above and below the teeth and connecting contact portions of the divided coils by welding or the like. According to this method, since the hooks protruding toward the left and right slots are provided at the tip of the tooth, the problem that the coil comes off after the coil is fixed to the tooth is solved. However, there is a problem in that the manufacturing time is prolonged due to the processing labor when the coil is divided into two and these are connected again around the teeth by welding or the like.

  Here, to turn to the conventional open technology, along the extending direction of the slot groove from the opening formed in one end surface of the stator core provided with a flange for preventing the coil from coming off at the tip of the tooth. A slot liner is inserted into the slot groove, and a coil is produced by winding the winding a predetermined number of turns around the teeth in a winding device, and a heat-foamable resin composition foamed at a predetermined expansion ratio in advance is formed between the coil and the slot. A method is disclosed in which a coil is fixed to a tooth by press-fitting between liners, filling a space formed between them with foam, then dripping the varnish, and heating the whole to thermally cure the varnish. ing.

  According to this method, since the hooks projecting to the left and right slots are formed at the tip of the tooth, the problem that the coil comes off after the coil is fixed to the tooth is solved, but the conductor is routed around the tooth. Since it is necessary to form a coil by winding, the manufacturing efficiency is remarkably reduced as compared with a method in which a coil is formed in advance and fitted to a tooth.

JP 2010-148275 A

  The present invention has been made in view of the above-described problems, and the coils are efficiently arranged and fixed to the teeth of the stator core having the teeth for preventing the coils from coming off at the tips thereof. It is an object of the present invention to provide a method for fixing a coil to a tooth that can be performed and a structure for fixing a tooth and a coil.

  In order to achieve the above-mentioned object, a method for fixing a coil to a tooth according to the present invention includes a yoke having a substantially annular or arc shape in plan view and a tooth projecting inward in the radial direction from the yoke around the teeth of the stator core. A stator core comprising a tooth formed by winding a conductive wire, and having a tooth provided with a flange projecting to one of the left and right slots of the tooth at the tip of the tooth A first step of preparing a coil, inserting a coil into the slot and disposing the coil around the tooth, shifting the coil to the side of the side of the tooth with the heel, and between the side of the tooth without the heel and the coil A second step of forming a gap, inserting a thermally expandable sheet into the gap, and heat-treating it to expand the thermally expandable sheet; Is made of a third step of adhering against the coil on the side surfaces of the teeth collar are provided.

  The method of fixing the coil to the teeth of the present invention eliminates the conventional tooth structure including the ribs protruding to the left and right slots at the tip, and includes the ribs protruding to one of the left and right slots at the tip. Insert a coil wound with a conductive wire into the tooth of the stator core with a tooth structure, and insert a thermally expandable sheet into the gap formed by shifting the coil to the side of the tooth with the flange. By heat treatment and expansion, the coil is pressed against the side of the tooth where the coffin is provided, and this coffin can efficiently insert the coil into the coffin tooth while preventing the coil from coming off. This is the fixing method.

  Here, the thermal expansion sheet to be applied is not particularly limited, but thermal expansion such as a thermal expansion rubber sheet, a thermal expansion foam plastic sheet, and a thermal expansion mat in which a fiber material is bonded with an inorganic binder resin. An appropriate material having rigidity capable of sufficiently pressing the coil against the wall surface when applied is applicable.

  In addition, the coil may be a round wire coil with a circular cross section or a flat wire capable of improving the space factor, and any of which an insulating coating such as enamel is formed can be applied. .

  Further, another embodiment of the method for fixing a coil to a tooth according to the present invention includes a substantially annular or arcuate yoke in plan view, and a tooth projecting inward in the radial direction from the yoke. A method for fixing a coil, comprising preparing a coil formed by winding a conductive wire, and having a tooth provided with a ridge projecting to one of the left and right slots of the tooth at the tip of the tooth. First step of preparing a stator core, inserting a coil into a slot and disposing it around the teeth, and shifting the coil to the side of the tooth with the flange between the side surface of the tooth without the flange and the coil A second step of forming a gap in the coil, by pressing a plate material into the gap, the coil is pressed against the side surface of the tooth provided with the flange It is made of a third step of adhering.

  The embodiment of the fixing method is the same as the fixing method described above until the first and second steps, but in the third step, the gap formed on the side surfaces of the coil and the teeth. For example, a hard plate material is press-fitted into the teeth so that the coil is pressed against the side surface of the teeth provided with the heel.

  Here, the plate material to be applied is not particularly limited, and a plate material made of a hard resin, ceramics, or the like, and appropriately made of a plate material having rigidity that does not break during press-fitting can be applied.

  In a preferred embodiment of the method for fixing a coil to a tooth according to the present invention, the stator core is composed of a plurality of divided cores, and in the second step, the coil is arranged in the circumferential direction. Assemble each ring in the corresponding slot by inserting the teeth of the corresponding split core into each coil in turn and assembling the stator core, and rotating the assembled stator core around its central axis. The gap is formed by simultaneously shifting to the side of the corresponding tooth with the ridge.

  When the stator core is composed of split cores, the coils corresponding to the split cores are assembled in a ring shape, and the stator cores composed of split cores are assembled by sequentially inserting the teeth of the split cores into the coils. .

  By rotating this assembled stator core around its central axis, each coil can be simultaneously shifted to the side of the corresponding tooth with a hook in the corresponding slot, and to the side of all the coils. A gap can be formed at the same time.

  Next, insert a thermally expandable sheet sequentially into the gap between the formed coils, or press-fit a plate material. When the thermally expandable sheet is inserted, heat treatment is further performed to expand the sheet. Thus, all the coils can be fixed to the corresponding teeth extremely efficiently and in a short time.

  Further, as a preferred embodiment of the method for fixing the coil to the teeth according to the present invention, the position of the flange is set so that the flange protrudes upstream in the rotational direction of the rotor disposed inside the stator core. It is good to do.

  At the tip of the teeth, a hook protrudes from one of the left and right slots of the tooth. In this method, the protruding position of the hook is defined on the upstream side in the rotational direction of the rotor disposed inside the stator core. It is what. Here, the “upstream side in the rotational direction” means the side of the rotor that first faces the arbitrary part of the rotating rotor when attention is paid to the tips of the left and right side surfaces of the teeth. When the point passes so as to face the end portion of the right side surface of the teeth and then passes so as to face the end portion of the left side surface, a ridge is formed at the end portion position of the right side surface. . According to this method, it has been proved by the present inventors that the magnetic characteristics can be improved in addition to efficiently inserting the coil into the tooth with the hook while the hook prevents the coil from coming off. Yes.

  According to this method, it has been proved by the present inventors that the magnetic characteristics can be improved in addition to efficiently inserting the coil into the tooth with the hook while the hook prevents the coil from coming off. Yes.

  In addition, the present invention extends to a structure for fixing a tooth and a coil. The fixing structure includes a yoke having a substantially annular or arc shape in plan view and a tooth that protrudes radially inward from the yoke. A coil-fixing structure in which a coil is fixed around the teeth, and a hook for preventing the coil protruding from one of the left and right slots of the teeth from coming off is provided at the tip of the teeth. There is a coil pressed against the side surface of the tooth provided with the heel, and the thermally expandable sheet is interposed between the side surface of the tooth without the heel and the coil so that the coil is fixed around the tooth. It is what.

  Furthermore, in another embodiment of the tooth and coil fixing structure according to the present invention, a coil is disposed around the teeth of the stator core, which is composed of a substantially annular or arcuate yoke in plan view and teeth projecting radially inward from the yoke. A structure for fixing a tooth and a coil that is fixed, and a tip of the tooth is provided with a hook for preventing the coil protruding from one of the left and right slots of the tooth, and the hook The coil is pressed and adhered to the side surface of the provided tooth, and the coil is fixed around the tooth with a plate material press-fitted between the side surface of the tooth not provided with the hook and the coil.

  In any of the fixing structures described above, a hook that protrudes to either one of the left and right slots is provided at the tip of the tooth, and the coil is pressed against the side surface of the tooth provided with the hook. As a result, a fixed structure is obtained in which the coil is firmly fixed without the coil coming off from the tip of the tooth.

  Also, in the above-described fixing structure, by applying a form in which the flange protrudes upstream in the rotational direction of the rotor disposed inside the stator core, both of the coils can be removed from the tip of the teeth. In addition to being firmly fixed, torque ripple can be reduced.

  As can be understood from the above description, according to the method for fixing a coil to the tooth and the structure for fixing the tooth and the coil according to the present invention, the coil is disposed on the tooth while preventing the coil from being pulled out by the hook at the tip of the tooth. And fixing can be performed extremely efficiently, and the motor manufacturing time can be shortened and the manufacturing cost can be reduced based on this.

It is a figure explaining the 1st step of one embodiment of a method of fixing a coil to teeth of the present invention. FIG. 2 is a diagram for explaining a second step following FIG. 1. In a 2nd step, it is a top view explaining the state by which the thermally expansible sheet was inserted in the slot. FIG. 4 is a plan view for explaining a state in which a gap is formed between the side surface of the tooth without the heel and the coil by shifting the coil to the side surface of the tooth with the heel after FIG. 3. FIG. 5 is a diagram for explaining a third step following FIG. 4. In a 3rd step, it is a figure explaining the fixing structure of the teeth and coil of this invention formed by thermally expanding a sheet | seat by heat processing. The distance between the slot which is the slot and the side surface of the teeth without the flange: a, the coil width: b, the thickness of the thermally expandable sheet: c, the protrusion length of the flange: d, the radius of curvature r of the corner of the coil It is a figure explaining each relationship. In the method of press-fitting a hard plate into the gap, the distance between the slot that is a slot insertion slot and the side surface of the tooth without a fold: a, the width of the coil: b, the thickness of the hard plate: c, the protrusion length of the ridge: d It is a figure explaining each relationship of the curvature radius r of the corner part. It is the figure explaining the preferable arrangement | positioning position of the collar in the front-end | tip of teeth.

  Hereinafter, embodiments of a method for fixing a coil to a tooth of the present invention and a fixing structure formed by this method will be described with reference to the drawings. In addition, although the method of fixing a coil to the tooth | gear shown in figure is a form which inserts a split core sequentially with respect to what attached the coil annularly, after assembling a coil to each split core, each split core is annularly formed. Of course, it may be an assembly method. Furthermore, as a matter of course, a method may be used in which coils are sequentially assembled to each tooth of a stator core that is integrally formed in an annular shape instead of a split core.

(Embodiment 1 of a method for fixing a coil to a tooth and a fixing structure)
FIG. 1 is a diagram for explaining a first step of the first embodiment of the method for fixing a coil to a tooth of the present invention, and FIG. 2 is a diagram for explaining a second step following FIG. FIG. 5 is a diagram for explaining the third step.

  FIG. 1 shows a split core 1, and a stator core (not shown) is formed by assembling the split core 1 in an annular shape. The split core 1 is composed of an arcuate yoke 1e and two teeth 1a and 1a projecting radially from the yoke 1e, and a slot 1f into which the coil 2 is inserted between the teeth 1a and 1a. Is defined.

  The split core 1 includes a steel plate laminate formed by laminating steel plates such as electromagnetic steel plates, cold rolled steel plates (SPCC), hot rolled steel plates (SPHC), carbon steel (S45C), soft magnetic metal powders or soft magnetic materials. It is formed from a powder magnetic core formed by pressure-molding magnetic powder in which metal oxide powder is coated with a resin binder such as silicone resin or silica.

  The tooth 1a that constitutes the split core 1 is provided with a collar 1b that protrudes to one of the left and right slots 1f and 1f of the tooth 1a to prevent the coil 2 from coming off. In addition, the conventional tooth structure with a hook at the tip is one in which the hook protrudes from the left and right, and adopting a stator having a tooth with a hook protruding only on one side is one of the novel features. One.

  The coil 2 is made of a rectangular wire, and is formed by edgewise winding a copper-made rectangular conductor wire having an insulating film formed around it. By using the coil 2 made of this rectangular wire, the space factor of the coil in the slot 1f is improved.

  The width of the coil 2: b is smaller than the width of the slot opening, that is, the width from the tip of the heel 1b to the side surface 1c without the heel of the teeth 1a so that it can be inserted into the slot 1f (X1 direction). It is formed with a width, and after being inserted into the slot 1f, it is further movable within the slot 1f. A more detailed relationship such as the width of the coil 2, the width of the slot opening, and the width of the slot will be described later.

In the first step, a desired number of split cores 1 and coils 2 shown are manufactured and prepared.
Next, as shown in FIG. 2, a plurality of coils 2,... Are arranged in a circumferential direction and assembled in a ring shape, and teeth 1a of the corresponding split cores 1 are sequentially inserted into the respective coils 2 (X1). Direction) Assemble an annular stator core (not shown).

  When the annular stator core is formed, each coil 2 can be simultaneously shifted to the side surface 1d side of the tooth provided with the hook in the corresponding slot 1f by rotating the assembled stator core around its central axis. In each slot 1f, a gap is formed between the tooth side surface 1c and the coil 2 that do not have a ridge (second step).

  Here, the insertion of the coil 2 into each slot 1f and the movement of the coil 2 in the slot 1f will be described in detail with reference to FIGS.

  When the tooth 1a of the split core 1 is inserted into the coil 2, a gap G1 is formed between the coil 2 and the tooth side surface 1d provided with the flange as shown in FIG.

  In this state, when the annular stator core is rotated around its central axis (in the X2 direction), the coil 2 is relatively moved toward and closely adhered to the teeth side surface 1d side having the flange in each slot 1f, as shown in FIG. As described above, the gap G2 is formed between the coil 2 and the tooth side surface 1c that does not include the flange.

  That is, according to the illustrated method, for example, when the stator core assembled in an annular shape includes ten slots 1f, the gap G2 can be formed in all of the ten slots 1f at a time.

  When the gaps G2 are formed in the slots 1f, the thermally expandable sheets 3 are sequentially inserted into the gaps G2, as shown in FIG. In the state where the thermally expandable sheet 3 is inserted into the gap G2, a slight gap may remain in the gap G2 as shown in the figure, or the gap may be completely closed (assuming that Even if the gap is completely closed, the coil is not pushed sideways by the thermally expandable sheet at this stage).

  The thermally expandable sheet 3 is thermally expanded in addition to having a thermally expandable property such as a thermally expandable rubber sheet, a thermally expandable foamed plastic sheet, and a thermally expandable mat in which a fiber material is bonded with an inorganic binder resin. In this case, an appropriate material having a rigidity capable of sufficiently pressing the coil 2 toward the tooth side surface 1d provided with the flange is applied.

  When the heat-expandable sheet 3 is inserted into the gaps G2 in all the slots 1f, the stator core is heat-treated in a temperature atmosphere in which the heat-expandable sheet 3 is thermally expanded, so that the heat-expandable sheet 3 as shown in FIG. Is thermally expanded (expansion amount δ), and the coil 2 is pressed against and closely adhered to the side surface 1d of the tooth provided with the ridge (pressing force P), thereby forming the tooth-coil fixing structure 10 (third Step).

  In the fixing structure 10 shown in the drawing, the coil 2 is prevented from coming off while being in surface contact with the flange 1b, and is pressed into the side surface 1d of the tooth provided with the flange, thereby providing a strong fixing structure with the tooth 1a. Will be maintained.

  According to the method of fixing the coil to the tooth shown and the tooth-coil fixing structure 10 formed by this method, it is possible to form a structure in which the coil 2 is prevented from coming off by the flange 1b at the tip of the tooth. The coil 2 can be disposed and fixed to the teeth 1a very efficiently. This leads to a reduction in motor manufacturing time and a reduction in motor manufacturing cost.

(Embodiment 2 of method and fixing structure for fixing coil to teeth)
Instead of applying the thermally expandable sheet 3 as in the illustrated example, a hard plate material made of hard resin, ceramics, or the like is press-fitted into the gap G2, and the side surface 1d of the teeth provided with the ridges by the press-fitted hard plate material is used. A method of pressing the coil 2 and a fixing structure formed by this method may be used.

(About relational expressions between components)
Next, referring to FIGS. 7 and 8, the distance from the flange 1 b that is the slot insertion opening to the tooth side surface 1 c without the flange: a, the width of the coil 2: b, and the thickness of the thermally expandable sheet 3: c (or The relationship between the thickness of the hard plate 4: c), the protrusion length of the flange 1b: d, and the curvature radius r of the corner of the coil 2 will be described. 7 illustrates the case where the thermally expandable sheet 3 is applied, and FIG. 8 illustrates the case where the hard plate material 4 is applied.

  First, as shown in FIG. 7, the coil 2 can be inserted into the slot 1f, the coil 2 is moved within the slot 1f to form a gap G2, and the thermally expandable sheet 3 into the gap G2 is formed. As a relational expression that satisfies all of the requirements of enabling insertion and further enabling the coil 2 to be locked in contact with the flange 1b when the thermally expandable sheet 3 is thermally expanded. It is necessary to satisfy the following three formulas described in FIG.

a + d> b + c (1)
a + d = b + c ′ (2) (c ′ is the thickness of the sheet after thermal expansion)
a> b, d ≧ r (3) (r is the radius of curvature of the corner of the coil 2)

  On the other hand, as shown in FIG. 8, it is possible to insert the coil 2 into the slot 1f, and the coil 2 is moved in the slot 1f to form a gap G2, and the hard plate 4 is press-fitted into the gap G2 ( X3 direction), and furthermore, when the hard plate 4 is press-fitted, the coil 2 can be brought into surface contact with the flange 1b and locked. It is necessary to satisfy the following three formulas described in FIG.

a + d> b + c (1)
a + d = b + c ″ (2) (c ″ is the thickness of the hard plate after press fitting)
a> b, c> d ≧ r (3) (r is the radius of curvature of the corner of the coil 2)

  The stator core is manufactured using the method of fixing the coil to the teeth of the present invention described above by preparing the split core 1 and the coil 2 satisfying the above relational expressions, the thermal expansion sheet 3 and the hard plate material 4. As a result, it is possible to manufacture a stator having high fixing strength between the coil and the teeth under high manufacturing efficiency.

(Analysis result specifying the preferred location of the heel at the tip of the tooth)
FIG. 9 is a view for explaining a preferable arrangement position of the heel at the tip of the teeth. In the figure, a part of a rotor 5 that rotates inside an assembly (stator core) of a split core 1 and permanent magnets 6 and 6 that are arranged in a V shape in plan view and form one magnetic pole in two. Show. In the same figure, the south and north poles of the teeth and the north and south poles of the permanent magnet are shown.

  The present inventors conducted a magnetic field analysis (current value set to 150 Arms, advance angle 46 degrees), and in the computer, as shown in FIG. A model with a configuration formed so as to project the flange 1b at the end of the side surface of the teeth is created (Example), and a model with a configuration formed so as to project the flange 1b on the downstream side in the rotation direction is created. (Comparative Example 1) In addition, models that do not have wrinkles are created (Comparative Example 2), and the effective torque value and ripple rate of each model are calculated, and the effective torque value and ripple rate of Comparative Example 2 are used as reference values. Then, an analysis was performed to normalize each value of Comparative Example 1 and Example. The results are shown in Table 1 below.

  In Table 1, the ripple change rate of the example is-, which means that the ripple change rate is reduced and tends to be favorable.

  From the analysis results, it is proved that the effective torque value of the example also increases, while the ripple change rate decreases, and the motor performance is improved.

  As is apparent from FIG. 9, in the model of the embodiment, the hook 1b protrudes from the end of the tooth side surface that is the upstream side in the rotation direction of the rotor, so that the S pole of the tooth is in the circumferential direction. In addition, since the N pole of the permanent magnet 6 and the ridge are close to each other, the attractive force is earlier with respect to the magnet than when there is no ridge or when the ridge is downstream in the rotational direction. It is considered that the torque is improved and the torque ripple is reduced.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and there are design changes and the like without departing from the gist of the present invention. They are also included in the present invention.

  DESCRIPTION OF SYMBOLS 1 ... Split core, 1a ... Teeth, 1b ... 鍔, 1c ... Teeth side without heel, 1d ... Teeth side with heel, 1e ... Yoke, 1f ... Slot, 2 ... Coil, 3 ... Thermal expansion sheet, 4 ... Rigid plate material, 5 ... Rotor, 6 ... Permanent magnet, 10 ... Teeth and coil fixing structure, G1, G2 ... Gap

Claims (9)

A method of fixing a coil around a tooth of a stator core comprising a substantially ring-shaped or arc-shaped yoke in plan view and teeth projecting radially inward from the yoke,
A first step of preparing a coil formed by winding a conductive wire, and preparing a stator core including a tooth provided with a flange protruding to one of the left and right slots of the tooth at the tip of the tooth,
A second coil is inserted into the slot and disposed around the teeth, and the coil is shifted to the side surface of the tooth with the flange to form a gap between the side surface of the tooth without the flange and the coil. Steps,
By inserting a thermally expandable sheet into the gap and heat-treating the thermally expandable sheet to expand the thermally expandable sheet, the coil is brought into contact with the heel and locked, and the coil is provided on the side surface of the tooth provided with the heel. A method of fixing the coil to the teeth comprising the third step of pressing and adhering. A method of fixing a coil around a tooth of a stator core comprising a substantially ring-shaped or arc-shaped yoke in plan view and teeth projecting radially inward from the yoke,
A first step of preparing a coil formed by winding a conductive wire, and preparing a stator core including a tooth provided with a flange protruding to one of the left and right slots of the tooth at the tip of the tooth,
A second coil is inserted into the slot and disposed around the teeth, and the coil is shifted to the side surface of the tooth with the flange to form a gap between the side surface of the tooth without the flange and the coil. Steps,
By press-fitting a plate material into the gap, the coil is brought into contact with the hook and locked, and the coil is attached to the tooth comprising the third step of pressing the coil against the side surface of the tooth with which the hook is provided. How to fix. The stator core is composed of a plurality of divided cores,
In the second step, the coils are arranged in the circumferential direction and assembled in an annular shape, the teeth of the corresponding split cores are sequentially inserted into the respective coils to assemble the stator core, and the assembled stator core is rotated around its central axis. The method of fixing a coil to the tooth of Claim 1 or 2 which forms a clearance gap by simultaneously shifting each coil to the side surface side of the corresponding tooth | gear provided with the collar within the corresponding slot.   The method for fixing a coil to a tooth according to claim 1, wherein the conducting wire is a flat wire.   The method of fixing a coil to the teeth according to claim 1, wherein the flange protrudes upstream in the rotational direction of a rotor disposed inside the stator core. A tooth-coil fixing structure in which a coil is fixed around teeth of a stator core comprising a substantially ring-shaped or arc-shaped yoke in plan view and teeth projecting radially inward from the yoke,
The tip of the tooth is provided with a hook for preventing the coil protruding from one of the left and right slots of the tooth from coming off,
One coil inserted into the slot is locked in contact with the hook, and the coil is pressed against and closely contacts the side face of the tooth provided with the hook, and the side face and coil of the tooth without the hook. A structure for fixing a tooth and a coil, in which a coil is fixed around the tooth with a thermally expandable sheet interposed between them. A tooth-coil fixing structure in which a coil is fixed around teeth of a stator core comprising a substantially ring-shaped or arc-shaped yoke in plan view and teeth projecting radially inward from the yoke,
The tip of the tooth is provided with a hook for preventing the coil protruding from one of the left and right slots of the tooth from coming off,
One coil inserted into the slot is locked in contact with the hook, and the coil is pressed against and closely contacts the side face of the tooth provided with the hook, and the side face and coil of the tooth without the hook. Teeth and coil fixing structure in which a coil is fixed around the teeth with a press-fitted plate material interposed between them.   The teeth and coil fixing structure according to claim 6 or 7, wherein the conducting wire is a flat wire.   The teeth and coil fixing structure according to any one of claims 6 to 8, wherein the flange protrudes upstream in the rotational direction of a rotor disposed inside the stator core.

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