JP2006238587A - Method for manufacturing stator of synchronous motor, stator and blower of synchronous motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To acquire a method for manufacturing a stator of an inexpensive, compact, low-noise, low-vibration and high-efficiency synchronous motor. <P>SOLUTION: The method for manufacturing the stator of the synchronous motor is a method for manufacturing the stator of the inner rotor synchronous motor provided with a rotor within the stator. The method is provided with a step for cutting a core having a core back section, a teeth winding section protruding from the core back section and a teeth tip section facing the rotor at a tip of the teeth winding section from one steel plate, a step for folding the core back section and the teeth tip section of the core to the teeth winding section in the same direction, a step for winding a wire onto the teeth winding section and a step for cylindrically molding the core back section. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a synchronous motor provided with a rotor using a magnet, and relates to a synchronous motor that achieves small size, low cost, and low noise.

  A stator core of a conventional inner rotor type synchronous motor is formed by stacking a plurality of punched steel plates. In the case of a small fan motor or the like having a small motor output, the output torque is also small, so that the required number of stator cores to be stacked is small and the core is often very thin.

  Further, when a motor having a large axial dimension and a small outer diameter is made, a stator core is formed by stacking a plurality of cores having a small diameter.

  As a technology for facilitating the winding work of thin stator cores, there is a technology in which windings are wound around a punched stator core with a reduced number of teeth, and they are stacked while shifting the position of the teeth. Yes (see, for example, Patent Document 1).

Moreover, in a fan motor with a small output, a steel plate may not be laminated | stacked, but a several steel plate may be bent and a core may be comprised, and a stator may be comprised by a combination with a coil. In this case, the windings are not directly wound around the teeth constituting the magnetic poles, but only a large coil is used, so that the assembly of the electric motor is relatively easy (see, for example, Patent Document 2).
JP 2003-299268 A JP 2004-222373 A

  In the case of a stator core constructed by laminating steel plates as in the past, if an attempt is made to construct an electric motor by pressing a thin stator core with a small number of laminated layers into the frame, the axial dimension is short. The gap between the rotor and the rotor becomes uneven, which causes vibration and noise.

  In addition, if a coil is intensively wound around the teeth constituting the magnetic pole by a fan motor or the like having a small output, the work is difficult because the physique of the motor is small.

  When trying to construct a stator core used for a small-diameter motor by laminating steel sheets, there are problems that the number of laminations increases and the processing cost increases, and the difficulty of winding work due to the small inner diameter is also a problem. Become.

  As described in Patent Document 1, after winding a winding on a steel sheet with a reduced number of teeth, and shifting the positions of the teeth and stacking them, the distance between the teeth can be increased during winding, thus facilitating the work. However, since the axial positions of the teeth facing the rotor are different from each other, an axial excitation force is likely to be generated during operation, which is likely to cause vibration and noise. In addition, since the thickness of the core remains thin, it is difficult to prevent the core from being tilted when pressed into the frame.

  As in Patent Document 2, when a stator is configured using a stator core and a coil obtained by bending a steel plate, assembly is easy, but since the coil becomes large, the circumference of the winding becomes long, A decrease in efficiency and an increase in material cost can be considered.

  SUMMARY OF THE INVENTION The present invention is made to solve the above-described problems. A stator of a synchronous motor that can be reduced in cost, reduced in size, reduced in noise, reduced in vibration, and improved in efficiency, a manufacturing method thereof, and a synchronous motor thereof It aims at obtaining the air blower using.

A method for manufacturing a stator of a synchronous motor according to the present invention is a method for manufacturing a stator of an inner rotor type synchronous motor in which a rotor is provided inside the stator.
Cutting a core having a core back part, a tooth winding part protruding from the core back part, and a tooth tip part facing the rotor at the tip of the tooth winding part from one steel plate;
Bending the core back portion and the tooth tip portion of the core in the same direction with respect to the tooth winding portion;
Winding the winding around the teeth winding section;
And a step of forming the core back portion into a cylindrical shape.

The method for manufacturing a stator of a synchronous motor according to the present invention is advantageous in that the synchronous motor can be miniaturized and the material cost and processing cost can be kept low by the above configuration.
In addition, since the winding can be directly wound around the core teeth and the winding circumference can be shortened to reduce the winding resistance, the motor can be made highly efficient.

Embodiment 1 FIG.
1 to 5 are diagrams showing the first embodiment, in which FIG. 1 is a development view of the stator core, FIG. 2 is a perspective view showing a state in which a tooth tip portion and a tooth winding portion of the stator core are bent, and FIG. FIG. 4 is a perspective view showing a stator and a synchronous motor of the synchronous motor, FIG. 4 is a perspective view showing a tooth portion of the stator core, and FIG. 5 is a perspective view showing a shape of a tooth tip portion of the stator core of the synchronous motor.

  As shown in FIG. 1, the stator core includes a rectangular core back portion 1, a plurality of teeth winding portions 2 projecting from the longitudinal side thereof, and a tooth tip portion 3 facing the rotor magnet at the tip thereof. . As shown in FIG. 2, the tooth winding portion 2 is bent and the teeth tip portion 3 is bent with a curved surface. In this state, the teeth winding portion 2 is wound. After the winding work, the stator of the electric motor as shown in FIG. 3A can be obtained by bending the core back portion 1 into a cylindrical shape. The stator configured as described above is press-fitted into the frame 7 as shown in FIG. 3B, and a rotor composed of the magnet 5 and the shaft 6 is inserted to obtain a thin synchronous motor. it can.

  The stator shown in this embodiment forms a stator by bending a single steel plate. Since the core back portion 1 is cylindrical, the axial dimension can be secured, and the stator is press-fitted into the frame 7. Inclination can be prevented.

  Further, the teeth tip 3 can be bent to increase the area facing the rotor magnet, so that the motor output can be increased. Alternatively, since torque can be generated with a small current, the efficiency of the synchronous motor can be improved by suppressing the heat loss generated in the windings.

  When the core back portion 1 is flat and each tooth is arranged in a straight line (the state shown in FIG. 2), the interval between the adjacent tooth tip portions 3 (the opening portion of the slot) is wide. Work becomes easy.

  Moreover, since the space | interval of teeth tip part 3 can be narrowed after bending, a cogging torque can be made small and a motor with few vibration and noises is obtained.

In the above stator, as shown in FIG. 4, when the core back portion near the teeth winding portion 2 and the core back plane portion 8 and the teeth tip plane portion 9 are provided at the tip end portion of the teeth, this plane functions as a winding frame. Therefore, the winding can be prevented from collapsing, the winding circumference can be reduced, the amount of copper wire used can be reduced, and the motor characteristics can be improved.
The flat surface portion may be provided on either the core back portion or the tooth tip portion.

  Since the tooth tip 3 is formed by bending a flat steel plate, it can be set to a free shape. For example, as shown in FIG. 5 (a), the tooth tip 3 has a parallelogram shape with an inclination at the circumferential end. By using the tooth tip 10, the same effect as that obtained when oblique skew magnetization is applied to the rotor magnet can be obtained. As a result, the change in the magnetic flux of the rotor magnet obtained near the end face of the parallelogram-shaped tooth tip 10 becomes gentle, so that the cogging torque can be reduced and a motor with less vibration and noise can be obtained.

  In addition, for example, in the case of a shape such as a parallelogram-shaped tooth tip 10, since both ends are inclined, the magnet attracting force is unbalanced in the axial direction and an exciting force is generated. May cause vibration and noise. In this case, as shown in FIG. 5 (b), the tooth-shaped tooth tip 11 can cancel the unbalance of the suction force in the axial direction. The vibration force can be suppressed.

  Moreover, as shown in FIG.5 (c), even if it makes it the octagon-shaped teeth front-end | tip part 12 (a hexagon may be sufficient) which cut off the corner | angular of a rectangle, it receives by the octagon-shaped teeth front-end | tip part 12. Since the change in the magnetic flux of the rotor magnet can be moderated, the cogging torque can be reduced. This shape may be a polygon which is not limited.

  In addition, when the planar teeth tip portion 13 is used as shown in FIG. 5D, the distribution of magnetic flux density between the rotor magnet and the planar teeth tip portion 13 changes gradually. Inductive voltage generated in the windings can be made sinusoidal, and torque ripple can be reduced to obtain a motor with less vibration and noise.

  For example, when a stator having a shape as shown in FIG. 3 and a steel plate having a thickness of 1 mm and an outer diameter of about 60 mm and a core back portion and a tooth tip portion having an axial dimension of about 5 mm is used, an output is obtained. A synchronous motor of about 1W can be made. With this motor, a motor efficiency of about 35% can be obtained. In order to make an induction motor capable of obtaining the same output with the same outer diameter, it is necessary to use a stator in which steel plates are laminated by about 20 mm, and the efficiency of the motor at that time is about 15%. This also shows that the synchronous motor of this embodiment is small and efficient.

  Further, in the case of a synchronous motor with a small output as described above, since the insulation between the stator core and the winding can be simplified by driving with a low voltage of about 12 V, for example, the cost of the motor is also reduced. Can be lowered.

  By applying such a synchronous motor to a blower and combining it with a thin blade, for example, the blower itself can be made thin.

Embodiment 2. FIG.
FIG. 6 is a diagram showing the second embodiment, and is a perspective view showing a configuration of a tooth portion of a stator core showing the synchronous motor.
The stator core of the present embodiment is configured by using two stators shown in FIG. 2 and connecting them by turning them upside down. If the axial dimension of the tooth tip 3 facing the rotor magnet is increased, more magnetic flux generated from the rotor magnet can be obtained. If this dimension is too large, the magnetic flux is generated in the teeth winding part. As a result, the magnetic flux density is saturated and the axial dimension is increased, so that sufficient motor output cannot be obtained. Moreover, the iron loss which generate | occur | produces in a teeth winding part also becomes large, and the efficiency of a synchronous motor also falls.

  By connecting the cores of the same shape up and down as in the present embodiment, the cross-sectional area of the tooth winding portion 2 is enlarged at the same time as the axial dimension of the tooth tip portion 3 is enlarged, so that saturation of the magnetic flux is prevented. This makes it possible to increase the output of the motor.

  In addition, since the core back portion 1 and the tooth tip portion 3 protrude vertically, the role as a winding frame of the winding becomes more effective, and the winding is easily wound in alignment.

  For example, in the case of the synchronous motor having an output of about 1 W described in the first embodiment, when the cross-sectional area of the tooth winding portion is doubled as in the present embodiment, the motor efficiency is 35% to 44%. Could be improved. This is because the cross-sectional area of the tooth winding part was enlarged and magnetic flux was easily passed through this part, so the amount of magnetic flux linked to the winding increased by about 50%, the torque constant increased, and the copper loss increased. Is a factor.

Embodiment 3 FIG.
FIGS. 7 and 8 are views showing the third embodiment, FIG. 7 is a perspective view showing the configuration of the tooth winding portion of the stator core of the synchronous motor, and FIG. 8 is the tooth winding portion of the stator core of the synchronous motor. It is a perspective view which shows the structure of retaining.
As shown in FIG. 7, the core cut out from the steel plate is bent to form the stator core as in the first embodiment, but here, the core back portion 1 and the tooth tip portion 3 are divided, It is comprised as components (the 1st core 30 and the 2nd core 31).

  The teeth winding part 2 has a substantially common shape, the core back part 1 exists in the first core 30, and the tooth tip part 3 exists in the second core 31, and is fixed by overlapping the tooth winding part 2. Configure child core.

  Since the magnetic flux received at the tooth tip portion 3 is concentrated on the tooth winding portion 2, if the magnetic force of the rotor magnet is increased, the cross-sectional area of the tooth winding portion 2 cannot be sufficiently obtained in the core constituted by one steel plate. As a result, the magnetic flux density is saturated, and sufficient motor output cannot be obtained. In addition, problems such as increased loss and distortion of induced voltage are likely to occur. As described above, these problems can be prevented by dividing the core into two parts and overlapping the tooth winding portions 2 to increase the cross-sectional area to eliminate magnetic saturation.

  In addition, by dividing the core back portion 1 and the tooth tip portion 3, for example, a coil in which a winding is separately wound on a winding frame is inserted into the tooth winding portion 2, and the tooth tip portion 3 is inserted later. Thus, the assembly work of the stator can be facilitated.

  Moreover, as shown in FIG. 8, it is possible to prevent the tooth tip 3 from slipping out to the inner diameter side by providing the depression 15 on one side of the tooth winding part 2 to be overlapped and the protrusion 16 on the other. At the same time, the teeth winding portion 2 can be aligned.

Embodiment 4 FIG.
FIGS. 9 and 10 are diagrams showing the fourth embodiment, FIG. 9 is a development view of a steel plate constituting the stator core of the synchronous motor, and FIG. 10 is a perspective view showing the configuration of the tooth winding portion of the stator core of the synchronous motor. FIG.
As shown in FIG. 9, when the stator core is cut out from the steel plate, the tooth winding portion 2 is cut out wider than the actual dimension. A bent portion 17 is formed by cutting the connecting portion between the core back portion 1 and the tooth tip portion 3 while leaving a width of the actual dimension. Next, in this core, the tooth winding portion 2 bends the bent portion 17 while leaving the actual dimensions.

  Various methods can be considered for the bending method. For example, as shown in FIG. 10A, when the bent portions 17 are provided on both sides and bent in either the axial direction, the cross-sectional area of the tooth winding portion 2 is It can be approximately doubled. As a result, the saturation of the magnetic flux in the tooth winding portion can be relaxed and the output of the motor can be improved. Moreover, since the corner | angular part of a coil | winding part turns into a curved surface at the time of bending, it can also prevent that a coil | winding is damaged with the edge of the cut-out steel plate.

  Further, the cross-sectional area can be tripled by providing the teeth winding portion 2 with a bent portion 17 approximately twice the size and cutting it out and folding both sides up and down as shown in FIG. 10 (b). .

  Further, as shown in FIG. 10 (c), it is also possible to further increase the cross-sectional area of the tooth winding portion 2 by providing the tooth winding portion 2 with a bent portion 17 biased to one side and bending it so as to be wound. It is.

  By these methods, the cross-sectional area of the tooth winding portion corresponding to the magnetic flux obtained by the strength of the magnetic force of the rotor magnet and the axial dimension of the tooth tip 3 can be freely changed.

Embodiment 5. FIG.
11 to 14 are diagrams showing a fifth embodiment, FIG. 11 is a perspective view of a stator core and a stator of a synchronous motor, FIG. 12 is a perspective view showing a configuration of teeth of the stator core of the synchronous motor, and FIG. FIG. 14 is a perspective view showing the configuration of the stator core of the synchronous motor, and FIG. 14 is a perspective view showing the configuration of the stator core of the synchronous motor.
A core is divided | segmented for every teeth, each is cut out from one steel plate, and it bends in the shape like Fig.11 (a), and comprises the core back part 1, the teeth winding | winding part 2, and the teeth front-end | tip part 3. FIG. The point which the teeth winding part 2 is comprised by the plane parallel to a rotor rotating shaft differs from the above-mentioned Embodiment 1 thru | or 4. Similar to the above-described embodiment, the teeth winding portion 2 is wound. After the winding work, the outer peripheries (core back portions 1) of these cores are joined to form a stator core as shown in FIG.

  By adopting the above configuration, a small-sized and small-diameter synchronous motor can be obtained.

  At this time, for example, as performed in the fourth embodiment, the core is cut out from the steel sheet in a state where cuts are made on both sides of the tooth winding part 2, and the cross-sectional area of the tooth winding part is kept constant by folding both sides. As it is, the circumference of the winding can be shortened to reduce the amount of copper wire used, or the resistance value of the winding can be lowered to improve the motor characteristics.

  Moreover, when each tooth is divided into two parts as shown in FIG. 12 (a) and combined as shown in FIG. 12 (b) to form a tooth, the cross-sectional area of the tooth winding portion 2 can be increased. It is possible to prevent saturation of the magnetic flux density in the portion and increase the output of the synchronous motor.

  Moreover, in the core which comprises a stator as shown in FIG. 13, if the core back part 1 is comprised by components different from the teeth winding part 2 and the teeth front-end | tip part 3, the core back part 1 will be divided | segmented for every tooth. There is no need to do. For this reason, when cutting out from a steel plate, the notch part 18 is provided in the part which arrange | positions the teeth winding part 2 and the teeth front-end | tip part 3, and the teeth winding part 2 and the teeth front-end | tip part 3 are made into this notch part 18. Used to fit into the core back part 1.

  As a result, similarly to the first to fourth embodiments, the winding work can be performed with the teeth arranged in a line. After the winding work, the core back portion 1 can be bent into a cylindrical shape to obtain a stator.

  Moreover, when dividing | segmenting for every teeth, as shown in FIG. 14, for example, the notch connection part 19 is provided in the core back part 1 of adjacent teeth, and several teeth are connected in a line using this notch connection part 19. Is also possible. Thereby, winding work becomes easy. Further, since there is no bending work of the core back portion 1 after the winding work, the cylindrical stator can be easily assembled, and the core is hardly distorted.

Embodiment 6 FIG.
FIGS. 15 and 16 are views showing Embodiment 6, FIG. 15 is a sectional view of a duct ventilation fan, and FIG. 16 is a view showing a pipe fan ventilation fan.
FIG. 15A is a duct ventilation fan according to the sixth embodiment, and FIG. 15B is a duct ventilation fan using a conventional induction motor shown for comparison.
The ventilation fan 21 in FIG. 15 is a duct-type ventilation fan that is mainly attached to the ceiling of the room, and connects the exhaust port 24 to the duct. The sirocco fan 22 is rotated by an electric motor to take in indoor air from the intake port 23 and exhaust it to the outside through the exhaust port 24.

  When the conventional induction motor 25 is used, the axial dimension of the motor is increased as shown in FIG. 15B, so that the height of the ventilation fan 21 is also increased. Moreover, since the core of the laminated electrical steel sheet is used for the electric motor, the electric motor is heavy and the entire product is heavy. On the other hand, as shown in FIG. 15A, by mounting the synchronous motor 20 of the present invention, the motor can be made thinner and lighter, and the height of the ventilation fan 21 can be reduced and lightened. .

  FIG. 16 is a view showing another form of ventilation fan, FIG. 16 (a) is a pipe fan ventilation fan of Embodiment 6, and FIG. 16 (b) uses a conventional induction motor shown for comparison. It is a pipe fan ventilation fan.

  These are ventilation fans of a form called a pipe fan in which a main body is directly attached to an exhaust pipe. The propeller fan 26 is rotated by an electric motor, and the air sucked from the air inlet 23 is exhausted to the outside through a pipe connected to the rear surface of the ventilation fan.

  The conventional induction motor 25 has a large motor diameter, and the cross-sectional area of the air passage 27 around the motor cannot be made large. On the other hand, in the ventilation fan of the present embodiment, since the synchronous motor 20 can be made small in diameter, the cross-sectional area of the air passage 27 can be increased and the ventilation capacity can be increased.

  As an application example of the present invention, it can be applied to a fan motor having a small output.

It is a figure which shows Embodiment 1, and is an expanded view of a stator core. It is a figure which shows Embodiment 1, and is a perspective view which shows the state which the teeth front-end | tip part of the stator core and the teeth winding part were bent. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows Embodiment 1, and is a perspective view which shows the stator and synchronous motor of a synchronous motor. It is a figure which shows Embodiment 1, and is a perspective view which shows the teeth part of a stator core. It is a figure which shows Embodiment 1, and is a perspective view which shows the shape of the teeth front-end | tip part of the stator core of a synchronous motor. It is a figure which shows Embodiment 2, and is a perspective view which shows the structure of the teeth part of the stator core which shows a synchronous motor. It is a figure which shows Embodiment 3, and is a perspective view which shows the structure of the teeth winding part of the stator core of a synchronous motor. It is a figure which shows Embodiment 3, and is a perspective view which shows the structure of retaining of the teeth winding part of the stator core of a synchronous motor. It is a figure which shows Embodiment 4, and is an expanded view of the steel plate which comprises the stator core of a synchronous motor. It is a figure which shows Embodiment 4, and is a perspective view which shows the structure of the teeth winding part of the stator core of a synchronous motor. It is a figure which shows Embodiment 5, and is a perspective view of the stator core and stator of a synchronous motor. It is a figure which shows Embodiment 5, and is a perspective view which shows the structure of the teeth of the stator core of a synchronous motor. It is a figure which shows Embodiment 5, and is a perspective view which shows the structure of the stator core of a synchronous motor. It is a figure which shows Embodiment 5, and is a perspective view which shows the structure of the stator core of a synchronous motor. It is a figure which shows Embodiment 6, and is sectional drawing of a duct ventilation fan. It is a figure which shows Embodiment 6, and is a figure which shows a pipe fan ventilation fan.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Core back part, 2 Teeth winding part, 3 Teeth tip part, 4 Winding, 5 Magnet, 6 Shaft, 7 Frame, 8 Core back plane part, 9 Teeth tip plane part, 10 Parallelogram-shaped teeth tip part , 11 Teeth-shaped teeth tip, 12 Octagon-shaped teeth tip, 13 Planar teeth tip, 14 Core joint, 15 Depression, 16 Protrusion, 17 Bending, 18 Notch, 19 Notch connection part, 20 Synchronous motor, 21 Exhaust fan, 22 Sirocco fan, 23 Inlet, 24 Exhaust, 25 Induction motor, 26 Propeller fan, 27 Air path, 30 1st core, 31 2nd core

Claims (20)

In the manufacturing method of the stator of the inner rotor type synchronous motor in which the rotor is provided inside the stator,
Cutting a core having a core back part, a tooth winding part protruding from the core back part, and a tooth tip part facing the rotor at the tip of the tooth winding part from one steel plate;
Bending the core back portion and the tooth tip of the core in the same direction with respect to the teeth winding portion;
Winding a winding around the teeth winding portion;
And a step of forming the core back portion into a cylindrical shape. In the manufacturing method of the stator of the inner rotor type synchronous motor in which the rotor is provided inside the stator,
Cutting a core having a core back part, a tooth winding part protruding from the core back part, and a tooth tip part facing the rotor at the tip of the tooth winding part from one steel plate;
Bending the core back portion and the tooth tip of the core in the same direction with respect to the teeth winding portion;
A step of stacking the same shape core upside down so that the teeth winding portion overlaps;
Winding a winding around the superposed teeth winding portion;
And a step of forming the core back portion into a cylindrical shape. In the manufacturing method of the stator of the inner rotor type synchronous motor in which the rotor is provided inside the stator,
Cutting out a first core having a core back portion and a tooth winding portion protruding from the core back portion from one steel plate;
Cutting a second core having a tooth winding portion and a tooth tip portion facing the rotor at the tip of the tooth winding portion from one steel plate;
Bending the core back portion of the first core;
Bending the tooth tip of the second core;
Superimposing the teeth winding portion on the bent first core and second core;
Winding a winding around the superposed teeth winding portion;
And a step of forming the core back portion into a cylindrical shape. In the manufacturing method of the stator of the inner rotor type synchronous motor in which the rotor is provided inside the stator,
One steel plate is bent to form an arc-shaped core back portion, a tooth winding portion constituted by a plane parallel to the rotation axis of the rotor, and a substantially arc-shaped tooth tip portion facing the rotor. A step of dividing the core;
A step of winding a winding around the teeth winding portion of the split core;
And a step of forming a stator by combining split cores provided with windings. A method of manufacturing a stator of a synchronous motor, comprising: In the manufacturing method of the stator of the inner rotor type synchronous motor in which the rotor is provided inside the stator,
One steel plate is bent to form an arc-shaped core back portion, a tooth winding portion constituted by a plane parallel to the rotation axis of the rotor, and a substantially arc-shaped tooth tip portion facing the rotor. A step of dividing the core;
Integrating the two divided cores by superimposing the tooth windings;
A step of winding a winding around the teeth winding portion of the overlapped divided core;
And a step of forming a stator by combining split cores provided with windings. A method of manufacturing a stator of a synchronous motor, comprising: In the stator of an inner rotor type synchronous motor in which a rotor is provided inside the stator,
A core having a core back part, a tooth winding part protruding from the core back part, and a tooth tip part facing the rotor at the tip of the tooth winding part is cut out from one steel plate, the core back part and the core A synchronous electric motor characterized in that a tooth tip is bent in the same direction with respect to the teeth winding portion, and the core back portion is formed into a cylindrical shape after winding the winding around the teeth winding portion. Stator.   The synchronous motor stator according to claim 6, wherein at least one of the core back portion and a portion of the tooth tip portion that is in contact with the tooth winding portion is configured by a plane.   The stator of a synchronous motor according to claim 6, wherein the teeth tip portion facing the rotor has a parallelogram shape with an inclined end portion in the circumferential direction and has a substantially arc shape.   The stator of the synchronous motor according to claim 6, wherein a tip end portion of the teeth facing the rotor has a substantially arc shape with a circumferential end inclined in a dogleg shape.   The stator of the synchronous motor according to claim 6, wherein the tooth tip portion facing the rotor is bent into a polygonal steel plate to form a substantially arc shape.   The stator of a synchronous motor according to claim 6, wherein the teeth tip portion faces the rotor in a plane. In the stator of an inner rotor type synchronous motor in which a rotor is provided inside the stator,
A core having a core back part, a tooth winding part protruding from the core back part, and a tooth tip part facing the rotor at the tip of the tooth winding part is cut out from one steel plate, and the core of the core The back part and the tip of the tooth are bent in the same direction with respect to the tooth winding part, and the cores of the same shape are stacked upside down so that the teeth winding part overlaps, and wound around the overlapped tooth winding part. A stator of a synchronous motor, wherein the core back portion is formed into a cylindrical shape after winding a wire. In the stator of an inner rotor type synchronous motor in which a rotor is provided inside the stator,
A first core having a core back portion and a tooth winding portion protruding from the core back portion is cut out from one steel plate, and the teeth winding portion and the teeth facing the rotor at the tip of the tooth winding portion A second core having a tip portion is cut out from one steel plate, the core back portion of the first core is bent with respect to the teeth winding portion, and the tooth tip portion of the second core is bent. The first core and the second core that are bent are overlapped with the tooth winding portion, and the core back portion is cylindrical after the winding is wound around the overlapped tooth winding portion. A stator of a synchronous motor characterized by being formed into a shape.   14. The stator for a synchronous motor according to claim 13, wherein a recessed portion and a protruding portion are provided in each of the tooth winding portions to be overlapped so as to be positioned and retained when overlapped.   7. The stator for a synchronous motor according to claim 6, wherein the tooth winding portion is cut out in a wide state in advance, and both sides of the tooth winding portion are bent and overlapped. In the stator of an inner rotor type synchronous motor in which a rotor is provided inside the stator,
One steel plate is bent to form an arc-shaped core back portion, a tooth winding portion constituted by a plane parallel to the rotation axis of the rotor, and a substantially arc-shaped tooth tip portion facing the rotor. A stator of a synchronous motor, wherein a stator is formed by forming a split core, winding a winding around the tooth winding portion of the split core, and combining the split cores provided with the winding. In the stator of an inner rotor type synchronous motor in which a rotor is provided inside the stator,
One steel plate is bent to form an arc-shaped core back portion, a tooth winding portion constituted by a plane parallel to the rotation axis of the rotor, and a substantially arc-shaped tooth tip portion facing the rotor. A split core is used, and the two split cores are integrated by superimposing the tooth winding portions, and the winding is wound around the teeth winding portion of the overlapped split cores, and the split cores with the windings are combined. A stator of a synchronous motor characterized by forming a stator.   The stator of a synchronous motor according to claim 17, wherein a notch is provided in the core back part, and a part of the tooth winding part is fitted into the notch.   18. The synchronous motor fixing according to claim 17, wherein the overlapped divided core has notches at both ends of the core back portion, and adjacent teeth can be connected to each other using the notches. Child.   A blower using a synchronous motor having the stator of the synchronous motor according to any one of claims 6 to 19.

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