JP7399128B2 - Inner rotor type electric motor, blower, and method for manufacturing inner rotor type electric motor - Google Patents

Description

The present disclosure relates to an inner rotor type electric motor having a stator core around which windings are wound, a blower, and a method of manufacturing the inner rotor type electric motor.

In an inner rotor type electric motor, a rotor is arranged inside a cylindrical stator. The stator core has a cylindrical outer ring yoke portion and a plurality of teeth protruding from the inner peripheral surface of the outer ring yoke portion and arranged in the circumferential direction. A winding wire is wound around the tooth portion to form a winding portion. A portion of the winding portion that protrudes from the outer ring yoke portion in the central axis direction is called a winding end portion. When the amount of the winding end portions in the winding section increases, not only does the cost increase due to an increase in material cost, but also the resistance increases due to the length of the winding, resulting in a decrease in the efficiency of the motor.

In the method of inserting a winding part formed in an annular shape in advance into the tooth part, it is necessary to form the winding part in a size with a margin, so that the winding end part becomes large. Therefore, in Patent Document 1, a stator core is divided into an outer ring yoke portion and a tooth portion, an insulator is assembled to a plurality of tooth portions arranged in the circumferential direction to form a winding frame, and the winding wire is directly attached to the winding frame. By winding the wire and then assembling the outer ring yoke portion and the tooth portion, the winding end portion can be made smaller.

Patent No. 3102665

However, in the structure of Patent Document 1, when reducing the size of the winding end portion, in order to secure a path for the winding wire to be wound later, the winding wire to be wound first is placed on the inner periphery of the tip of the tooth portion. It sticks out to the side. Since the rotor is provided on the inner circumferential side of the stator, the rotor may interfere with the protruding windings, making it impossible to insert the rotor. Therefore, in such a case, it is necessary to arrange the rotor before placing the windings on the winding frame. When winding the winding with the rotor disposed, it is difficult to assemble the outer ring yoke and the teeth with high precision.

In order to avoid this situation, a space is formed in the winding frame into which the rotor can be inserted, and after the end of the winding is placed inside the space, the end of the winding is deformed and moved to the outside of the space. By doing so, it becomes possible to insert the rotor after winding. However, if the deformed end of the winding is not fixed, the winding may be deformed by external forces such as vibration, and the winding coating may be damaged by contact with the rotor or vibration, and insulation may not be maintained. There is.

An object of the present disclosure is to obtain an inner rotor type electric motor that can reduce the size of the winding end portion and prevent deformation of the winding end portion at low cost.

In order to solve the above-mentioned problems and achieve the objectives, an inner rotor type electric motor according to the present disclosure includes a plurality of teeth arranged radially in a circular manner and a cylindrical outer ring connecting the outer peripheral sides of the plurality of teeth. a stator core having a yoke portion; a first insulator that covers the plurality of teeth from the first axial end of the stator core; and a second insulator that covers the plurality of teeth from the second axial end of the stator core. an insulator having a first winding end portion on the first end side of the first insulator, a second winding end portion on the second end side of the second insulator, and an insulator wound on the insulator. The present invention includes a stator having a winding and a terminal block provided on a second end side of the stator core to connect the winding, and a rotor disposed inside the stator core. The first winding end portion is located on the first end side of the tooth portion and protrudes inward from the end position on the inner peripheral side, and the second winding end portion is located on the second end side of the tooth portion and protrudes inward from the end position on the inner peripheral side. Do not protrude inward from the side end position. The terminal block includes a cylindrical wall portion that defines the second winding end portion and the rotor, and a sheet-like varnish that applies varnish treatment to the second winding end portion.

According to the present disclosure, it is possible to reduce the size of the winding end portion and to prevent deformation of the winding end portion at low cost.

An exploded perspective view showing the appearance of an inner rotor type electric motor according to an embodiment. A perspective view showing the appearance of a stator core in an embodiment A perspective view showing the structure of an outer ring yoke portion in an embodiment. A perspective view showing a state in which the teeth in the embodiment are arranged radially. FIG. 2 is a perspective view showing a state in which a plurality of teeth in the embodiment are covered with an insulator, as seen from the first insulator side. FIG. 3 is a perspective view showing a state in which a plurality of teeth in the embodiment are covered with an insulator, as seen from the second insulator side. In the embodiment, a diagram showing a state in which a coil is wound around a tooth portion covered by an insulator, as seen from the first insulator side. In the embodiment, it is a diagram showing a state in which a coil is wound around a tooth portion covered by an insulator, as seen from the second insulator side. A circuit diagram showing an equivalent circuit of a single-phase induction motor to which the inner rotor type motor of the embodiment is applied. FIG. 2 is a diagram showing a state in which a coil is wound around a tooth portion covered by an insulator according to an embodiment, as seen from the first insulator side. A conceptual diagram showing a state in which a plurality of teeth arranged in a circular shape, an auxiliary winding, and a main winding are developed on a plane in an embodiment. FIG. 3 is a diagram showing a state in which the winding end portion of the coil wound around the tooth portion in the embodiment is deformed, as seen from the second insulator side. A perspective view of the stator according to the embodiment viewed from the second insulator side. Cross-sectional view of a stator according to an embodiment In an embodiment, a schematic cross-sectional view of a stator with winding end portions formed. A perspective view showing the configuration of a terminal block in an embodiment. A schematic cross-sectional diagram showing the configuration of a terminal block in an embodiment A sectional view showing the configuration of the stator after the terminal block in the embodiment is assembled. A schematic cross-sectional diagram showing the configuration of the stator after the terminal block in the embodiment is assembled. Process diagram showing the manufacturing process of the inner rotor type electric motor according to the embodiment A front view of a blower including an inner rotor type electric motor according to an embodiment.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Below, an inner rotor type electric motor, a blower, and a method for manufacturing the inner rotor type electric motor according to an embodiment will be described in detail based on the drawings.

Embodiment.
FIG. 1 is an exploded perspective view showing the appearance of an inner rotor type electric motor 100 according to an embodiment. In an inner rotor type electric motor (electric motor) 100, a rotor 2 is arranged inside a stator 1 having a cylindrical shape. The rotor 2 is provided with a shaft portion 23 extending along the central axis (not shown) of the stator 1 . The shaft portion 23 is rotatably supported by two bearings 3. The bearing 3 is supported by an outer shell 4 and an outer shell 5. The outer shell 4 and the outer shell 5 constitute a casing for accommodating the stator 1, rotor 2, and bearing 3 therein.

The stator 1 includes a stator core 6, a coil (winding) 7, an insulator 8, and a terminal block 14. Insulator 8 electrically insulates stator core 6 and coil 7 . The terminal block 14 is provided on one side of the stator 1 in the axial direction. The coil 7 is connected to the terminal block 14 . The axial direction is a direction along the axis of the shaft portion 23.

FIG. 2 is a perspective view showing the appearance of the stator core 6 in the embodiment. The stator core 6 includes a cylindrical outer ring yoke portion 9 and a plurality of tooth portions 10 that protrude from the inner peripheral surface of the outer ring yoke portion 9 and are arranged radially. The outer ring yoke portion 9 and the tooth portions 10 are formed by laminating a plurality of steel plates along the axial direction. The stator core 6 is two-phase, four-pole, and has 16 slots.

FIG. 3 is a perspective view showing the structure of the outer ring yoke portion 9 in the embodiment. FIG. 4 is a perspective view showing a state in which the teeth 10 in the embodiment are arranged radially. As shown in FIGS. 3 and 4, the outer ring yoke portion 9 and the tooth portions 10 are formed separately. A groove 9a is formed in the inner circumferential surface of the outer ring yoke portion 9, into which the root portion of the tooth portion 10 is fitted. When manufacturing the stator 1, as shown in FIG. 4, a plurality of teeth 10 are arranged radially and circularly. Further, after the coil 7 is wound around the plurality of teeth 10, the outer ring yoke portion 9 is assembled.

FIG. 5 is a diagram showing a state in which the plurality of tooth parts 10 in the embodiment are covered with the insulator 8, and is a perspective view seen from the first insulator 8a side. FIG. 6 is a diagram showing a state in which the plurality of tooth parts 10 in the embodiment are covered with the insulator 8, and is a perspective view seen from the second insulator 8b side.

As shown in FIGS. 5 and 6, all sides of the plurality of teeth 10 arranged radially are covered with the insulator 8. The inner circumferential surface of the plurality of teeth 10 facing the rotor 2 is exposed. The insulator 8 is made of an insulating material, such as an insulating resin. The insulator 8 is composed of two pieces including a first insulator 8a and a second insulator 8b. The first insulator 8a is called a lower insulator, and the second insulator 8b is called an upper insulator. The insulator 8 is assembled to the teeth 10 from above and below the teeth 10 arranged radially. After arranging one of the lower insulator 8a and the upper insulator 8b, the tooth portion 10 is assembled to one of the insulators 8. After that, the other insulator 8 is assembled.

As shown in FIG. 5, the lower insulator 8a covers the plurality of teeth 10 from the first end side, which is one side of the stator core 6 in the axial direction. The lower insulator 8a has a cover portion 8a1 that covers each of the tooth portions 10. The lower insulator 8a has a lid portion 8a2 that closes a central region surrounded by a plurality of teeth 10, that is, a central region surrounded by a plurality of cover portions 8a1. A hole through which the shaft portion 23 passes is formed in the lid portion 8a2. A rib-shaped hook portion 8a3 that projects in the axial direction is formed on the lid portion 8a2. In this embodiment, four hook portions 8a3 are formed, but the number varies depending on the number of poles of stator core 6, etc. The hook portion 8a3 has a first rib 8a4 extending in the radial direction and a second rib 8a5 extending in a direction perpendicular to the radial direction, and has a T-shape. The hook portion 8a3 has a width approximately equal to one tooth portion 10, and is provided as a protruding portion that protrudes from the outer circumference of the stator core 6 toward the inner circumference.

As shown in FIG. 6, the upper insulator 8b covers the plurality of teeth 10 from the second end side, which is the other side of the stator core 6 in the axial direction. The upper insulator 8b has a cover portion 8b1 that covers each of the tooth portions 10. In the upper insulator 8b, a central region surrounded by the plurality of tooth portions 10, that is, a central region surrounded by the plurality of cover portions 8b1 is not covered and forms a circular opening 8b2. The rotor 2 is inserted into the space inside the opening 8b2.

A space SL in which the coil 7 is wound is formed between the plurality of cover parts 8a1 and the plurality of cover parts 8b1.

FIG. 7 is a diagram showing a state in which the coil 7 is wound around the tooth portion 10 covered by the insulator 8 in the embodiment, and is a diagram seen from the lower insulator 8a side. FIG. 8 is a diagram showing a state in which the coil 7 is wound around the tooth portion 10 covered by the insulator 8 in the embodiment, and is a diagram seen from the upper insulator 8b side. 7 shows the winding end portion of the coil 7 on the lower insulator 8a side, and FIG. 8 shows the winding end portion of the coil 7 on the upper insulator 8b side.

As shown in FIG. 7, on the lower insulator 8a side, the coil 7a that is wound first is hooked on the hook portion 8a3 of the lower insulator 8a and wound around the cover portion 8a1 that covers the tooth portion 10. The coil 7a is not wound around the toothed portion 10 at the position corresponding to the hook portion 8a3, but is wound around every other toothed portion 10. The coil 7b to be wound later is wound around the cover part 8a1 without being caught by the hook part 8a3. The coils 7b are also wound around the teeth 10 every other time.

As shown in FIG. 8, the coil 7 is wound using a winding jig 12 on the upper insulator 8b side. The winding jig 12 protrudes toward the inner circumferential side of the stator core 6, and has a T-shaped rib structure similar to the hook portion 8a3. The coil 7a to be wound first is hooked onto a winding jig 12 disposed on the upper surface of the upper insulator 8b, and is wound around the cover portion 8b1 that covers the tooth portion 10. The coil 7a is not wound around the teeth 10 at the position where the winding jig 12 is arranged, but is wound around every other tooth 10. The coil 7b to be wound later is wound around the cover portion 8b1 without being hooked on the winding jig 12. The coils 7b are also wound around the teeth 10 every other time.

FIG. 9 is a circuit diagram showing an equivalent circuit of a single-phase induction motor to which the inner rotor type motor 100 of the embodiment is applied. Coil 7a is the auxiliary winding of the single-phase induction motor, and coil 7b is the main winding of the single-phase induction motor. For a single-phase AC power supply 127, a series body in which an auxiliary winding 7a consisting of four auxiliary winding coil parts 7a1, 7a2, 7a3, and 7a4 and a capacitor 128 are connected in series, and four main winding coils The main winding 7b consisting of portions 7b1, 7b2, 7b3, and 7b4 is connected in parallel. A capacitor 128 is mounted on the terminal block 14, and the terminal block 14 includes an auxiliary winding 7a consisting of auxiliary winding coil parts 7a1, 7a2, 7a3, and 7a4, as shown in FIG. A main winding 7b consisting of main winding coil portions 7b1, 7b2, 7b3, and 7b4 is connected to a capacitor 128.

The auxiliary winding current Is flowing through the auxiliary winding 7a is advanced in current phase by about 90° from the main winding current Im flowing through the main winding 7b due to the capacitor 128. This generates a rotating magnetic field in the direction of rotation. An ideal rotating magnetic field is obtained when the phase of the auxiliary winding current Is is 90 degrees ahead of the main winding current Im.

FIG. 10 is a diagram showing a state in which the coil 7 is wound around the tooth portion 10 covered by the insulator 8 of the embodiment, and is a diagram seen from the lower insulator 8a side. FIG. 10 is a diagram showing the same configuration as FIG. 7, but with four auxiliary winding coil parts 7a1, 7a2, 7a3, 7a4 and four main winding coil parts 7b1, 7b2, 7b3, 7b4. It mainly shows the arrangement relationship of . FIG. 11 is a conceptual diagram showing a state in which a plurality of tooth portions 10, an auxiliary winding 7a, and a main winding 7b arranged in a circular shape are developed in a plane in the embodiment.

Electric motor 100 has 16 teeth 10. The main winding coil portion 7b1 is wound around three adjacent tooth portions 10-1, 10-2, and 10-3. The main winding coil portion 7b2 is arranged opposite to the main winding coil portion 7b1 by skipping one tooth portion 10-4 and surrounding the three adjacent tooth portions 10-5, 10-6, and 10-7. The wires are wound in phase (current flows in opposite directions). The main winding coil portion 7b3 is constructed in the same manner as the main winding coil portion 7b1 by skipping one tooth portion 10-8 and surrounding three adjacent tooth portions 10-9, 10-10, and 10-11. Winded in phase. The main winding coil portion 7b4 skips one tooth portion 10-12 and surrounds the three adjacent tooth portions 10-13, 10-14, and 10-15, so that the main winding coil portion 7b4 has a phase opposite to that of the main winding coil portion 7b1. The wire is wound with. No main winding is wound around the teeth 10-16.

The auxiliary winding 7a is wound with two teeth 10 shifted from the main winding 7b. The auxiliary winding coil portion 7a1 is wound around the three adjacent tooth portions 10-15, 10-16, and 10-1. The auxiliary winding coil section 7a2 skips one tooth section 10-2 and surrounds the three adjacent tooth sections 10-3, 10-4, and 10-5, and is arranged opposite to the auxiliary winding coil section 7a1. Winded in phase. The auxiliary winding coil portion 7a3 is constructed in the same manner as the auxiliary winding coil portion 7a1 by skipping one tooth portion 10-6 and surrounding three adjacent tooth portions 10-7, 10-8, and 10-9. Winded in phase. The auxiliary winding coil portion 7a4 skips one tooth portion 10-10 and surrounds the three adjacent tooth portions 10-11, 10-12, and 10-13, so that the auxiliary winding coil portion 7a4 has a phase opposite to that of the auxiliary winding coil portion 7a1. The wire is wound with. No auxiliary winding is wound around the teeth 10-14.

FIG. 12 is a diagram showing a state in which the winding end portion of the coil 7 wound around the tooth portion 10 in the embodiment is deformed, and is a diagram seen from the upper insulator 8b side. On the upper insulator 8b side, when the winding of the coils 7a and 7b is completed, the winding jig 12 disposed on the upper surface of the upper insulator 8b is removed. Furthermore, by deforming the coil 7a of the coil 7a and the coil 7b from the inner circumferential side to the outer circumferential side of the toothed portion 10, the winding end portion 13b of the coil 7a on the upper insulator 8b side is completed. By forming the winding end portion 13b, a space for insertion of the rotor 2 is secured.

FIG. 13 is a perspective view of the stator 1 according to the embodiment viewed from the upper insulator 8b side. FIG. 14 is a sectional view of the stator 1 according to the embodiment. The stator 1 is formed by assembling the toothed portion 10 on which the insulator 8 and the coil 7 are arranged, and the outer ring yoke portion 9. It becomes possible to arrange the rotor 2 with respect to the stator 1.

FIG. 15 is a schematic cross-sectional view of the stator 1 with winding end portions formed in the embodiment. As shown in FIG. 15, a winding end portion 13b is formed on the upper insulator 8b, and a winding end portion 13a is formed on the lower insulator 8a side. The winding end portion 13a serving as the first winding end portion is located on the first end side of the tooth portion 10 and protrudes inward from the end position on the inner peripheral side. The winding end portion 13b serving as the second winding end portion does not protrude inward from the end position on the second end side and the inner peripheral side of the tooth portion 10.

FIG. 16 is a perspective view showing the configuration of the terminal block 14 according to the embodiment. FIG. 17 is a schematic cross-sectional view showing the configuration of the terminal block 14 according to the embodiment. The terminal block 14 has an annular base portion 14a and a cylindrical wall portion 14b extending in the axial direction from the base portion 14a. In the base part 14a, although not shown, as described above, the connections between the auxiliary winding coil parts 7a1, 7a2, 7a3, 7a4, the main winding coil parts 7b1, 7b2, 7b3, 7b4, and the capacitor 128 are made. will be held. The wall portion 14b is a separation wall for spatially defining the winding end portion 13b and the rotor 2. A sheet-like varnish 18 is provided on the back surface 15 of the base portion 14a for varnishing the winding end portion 13b of the upper insulator 8b. The varnish 18 is arranged by being adhered to the back surface 15 of the base portion 14a or by being hooked onto a plurality of claw portions 16 provided on the back surface 15 of the terminal block 14. The varnish 18 has an annular shape for varnishing the coils 7a and 7b on the upper insulator 8b side.

FIG. 18 is a sectional view showing the configuration of the stator 1 after the terminal block 14 in the embodiment is assembled. FIG. 19 is a schematic cross-sectional view showing the configuration of the stator 1 after the terminal block 14 in the embodiment is assembled. The winding end portion 13b and the rotor 2 are spatially separated from each other by the wall portion 14b. Therefore, deformation and movement of the winding end portion 13b toward the rotor 2 can be suppressed. In this state, the terminal block 14 is heated to melt the varnish 18, and the melted varnish 18 is supplied to the coils 7a and 7b on the upper insulator 8b side. Thereafter, the terminal block 14 is cooled, the varnish 18 is solidified, and the winding end portion 13b is fixed.

By such a method, the end portion of the winding can be fixed at a lower cost than the method of fixing the coil with lacing yarn and applying varnish treatment.

Next, the manufacturing process of the inner rotor type electric motor 100 according to the embodiment will be briefly described using process diagrams. FIG. 20 is a process diagram showing the manufacturing process of the inner rotor type electric motor 100 according to the embodiment.

First, the outer ring yoke portion 9 and the plurality of teeth portions 10 are formed separately. Next, the lower insulator 8a and the upper insulator 8b are placed (step S1). Next, a plurality of teeth 10 are arranged radially (step S2). Next, the plurality of teeth 10 are covered with the lower insulator 8a and the upper insulator 8b (step S3). Next, the winding jig 12 is placed on the upper insulator 8b side of the stator core 6 (step S4). Next, on the lower insulator 8a side, the coil 7 is wound so as to pass through the inner circumferential side of the hook portion 8a3 to form a winding end portion 13a, and on the upper insulator 8b side, the coil 7 is wound on the inner circumferential side of the winding jig 12. The winding end portion 13b is formed by winding the coil 7 so as to pass through the wire (step S5). Next, the winding jig 12 is removed (step S6).

Next, the winding end portion 13b on the upper insulator 8b side is deformed so as not to protrude inward from the end position on the inner circumference side at the second end side of the tooth portion 10 (step S7). Next, the terminal block 14 is placed on the upper insulator 8b side of the stator 1 (step S8). Next, the coil 7 is connected to the terminal block 14 (step S9). Next, the terminal block 14 is heated to melt the varnish 18 (step S10), and the melted varnish 18 is supplied to the winding end portion 13b (step S11). Next, the terminal block 14 is cooled, the varnish 18 is solidified, and the winding end portion 13b is fixed (step S12).

Thereafter, a jig is inserted into the region surrounded by the plurality of teeth 10, and the teeth 10 and the outer ring yoke portion 9 are connected. Next, the jig is removed. Next, the rotor 2 is provided inside the stator 1, and the bearing 3 and the outer shells 4 and 5 are provided, thereby completing the inner rotor type electric motor 100.

In this embodiment, the winding end portion 13a on the lower insulator 8a side protrudes inward from the end position on the inner peripheral side of the tooth portion 10, and the winding end portion 13b on the upper insulator 8b side The terminal block 14 is formed of a cylindrical wall portion that does not protrude inward from the inner peripheral end position of the tooth portion 10 and that defines the winding end portion 13b on the upper insulator 8b side and the rotor 2. 14b and a sheet-like varnish 18 for applying varnish treatment to the winding end portion 13b, the winding end portion 13b can be made smaller and deformation of the winding end portion 13b can be prevented at low cost. can.

FIG. 21 is a front view of a blower 55 including the inner rotor type electric motor 100 according to the embodiment. As shown in FIG. 21, the inner rotor electric motor 100 may be applied to a blower 55 that connects blades 54 to the shaft portion 23 and rotates the blades 54 to blow air. Note that the inner rotor type electric motor 100 may be applied to a ventilation fan that rotates blades or impellers to cause air to flow.

The configurations shown in the embodiments described above are examples of the contents of the present disclosure, and can be combined with other known technologies, and the configurations can be modified without departing from the gist of the present disclosure. It is also possible to omit or change parts.

1 stator, 2 rotor, 3 bearing, 4, 5 outer shell, 6 stator core, 7 coil (winding), 7a coil (auxiliary winding), 7a1, 7a2, 7a3, 7a4 auxiliary winding coil part, 7b Coil (main winding), 7b1, 7b2, 7b3, 7b4 Main winding coil part, 8 Insulator, 8a Lower insulator (first insulator), 8a1, 8b1 Cover part, 8a2 Lid part, 8a3 Hook part, 8a4 First rib , 8a5 second rib, 8b upper insulator (second insulator), 8b2 opening, 9 outer ring yoke, 9a groove, 10 teeth, 12 winding jig, 13a, 13b winding end, 14 terminal block, 14a Base portion, 14b wall portion, 15 back surface, 16 nail portion, 18 varnish, 23 shaft portion, 54 blade, 55 blower, 100 inner rotor type electric motor (motor), 127 single-phase AC power supply, 128 capacitor.

Claims (7)

a stator core having a plurality of tooth portions arranged in a radial circular manner and a cylindrical outer ring yoke portion connecting outer peripheral sides of the plurality of tooth portions;
an insulator having a first insulator that covers the plurality of teeth from a first end in the axial direction of the stator core; and a second insulator that covers the plurality of teeth from a second end in the axial direction;
a first winding end portion on the first end side of the first insulator; a second winding end portion on the second end side of the second insulator; and a winding wound on the insulator. Lines and,
a terminal block provided on the second end side of the stator core and connecting the winding;
a stator having;
a rotor disposed inside the stator core;
Equipped with
The first winding end portion protrudes inward from the end position on the first end side and inner peripheral side of the tooth portion, and the second winding end portion protrudes toward the inner peripheral side from the end position on the first end side and inner peripheral side of the tooth portion. On the end side and not protruding inward from the end position on the inner circumference side,
The terminal block includes a cylindrical wall portion that defines the second winding end portion and the rotor, and a sheet-like varnish that applies varnish treatment to the second winding end portion. Features an inner rotor type electric motor. The terminal block has a base part extending perpendicularly from the cylindrical wall part in the outer circumferential direction, and the sheet-like varnish is placed on the base part so as to be in contact with the second winding end part. The inner rotor type electric motor according to claim 1, characterized in that: The first insulator is
Claim characterized in that it has a plurality of hook parts arranged on the first end side of the plurality of tooth parts and on the inner circumference side from the end position on the inner circumference side, and for hooking the first winding end part. 1. The inner rotor type electric motor according to 1. An inner rotor type electric motor according to any one of claims 1 to 3,
a blower fan that is rotated by the inner rotor type electric motor and blows air;
A blower characterized by comprising: A stator core includes a plurality of tooth portions arranged in a radial circle, and a cylindrical outer ring yoke portion connecting the outer peripheral sides of the plurality of tooth portions; an insulator including a first insulator that covers from a first end side in the axial direction, and a second insulator that covers the plurality of teeth from a second end side in the axial direction; and on the first end side of the first insulator, a first winding end portion, a second winding end portion on the second end side of the second insulator, and a winding wound on the insulator and the second winding end portion of the stator core. The terminal block is provided on an end side and connects the winding, and the cylindrical wall defining the second winding end and the rotor and the second winding end are varnished. A method for manufacturing an inner rotor type electric motor, comprising: the terminal block having a sheet-like varnish to which the stator is applied; and a rotor disposed inside the stator core.
The first insulator is disposed on the first end side of the tooth portion and on the inner peripheral side from the inner peripheral end position, and has a plurality of hook portions for hooking the first winding end portion. ,
forming the outer ring yoke portion and the plurality of tooth portions separately;
arranging the plurality of tooth portions radially;
covering the plurality of teeth with the first insulator and the second insulator;
arranging a winding jig protruding from the inner periphery of the stator core on the second end side of the stator core;
On the first end side of the first insulator, a winding is wound so as to pass through the inner peripheral side of the hook part to form a first winding end part, and on the second end side of the second insulator, forming a second winding end portion by winding the winding wire so as to pass through the inner circumferential side of the winding jig;
a step of removing the winding jig;
deforming the second winding end portion so that it does not protrude inward from the end position on the second end side and the inner peripheral side of the plurality of teeth;
arranging the terminal block on the second end side of the stator;
connecting the winding to the terminal block;
melting the varnish by heating the terminal block and supplying the melted varnish to the second winding end;
cooling the terminal block and solidifying the varnish to fix the second winding end portion;
A method of manufacturing an inner rotor electric motor, comprising: Manufacturing the inner rotor type electric motor according to claim 5, further comprising, after the fixing step, a step of coupling the plurality of tooth portions around which windings are wound and the outer ring yoke portion. Method. 7. The method of manufacturing an inner rotor electric motor according to claim 6, further comprising the step of inserting a rotor into the inner peripheral side of the plurality of teeth after the step of combining.

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