JP2018026920A - motor - Google Patents

Abstract

A motor with high heat dissipation is provided. A motor 1 includes a stator 22 formed by molding a stator core 10 and a winding 30 with a resin mold body 40, a rotor 23 rotatably held inside the stator 22 via a gap, And a rotating shaft 24 inserted in the center of the rotor 23. On the outer peripheral surface 41 of the resin mold body 40, a plurality of convex portions 43a to 43l are provided while being spaced apart along the circumferential direction. At least one set of adjacent convex portions among the plurality of convex portions 43a to 43l is connected by at least one connecting portion 44a to 44h arranged with a gap between the outer peripheral surface 41 of the resin mold body 40. ing. [Selection] Figure 3

Description

  The present disclosure relates to a motor, and more particularly to a technique for improving heat dissipation of the motor.

  Conventionally, a motor has been used as a power source for electric devices such as air conditioners and washing machines. For example, in an outdoor unit of an air conditioner, a fan is rotated by the power of a motor to generate an air flow.

  FIG. 12 is a perspective view showing a motor according to a conventional example. For example, a motor 901 for an air conditioner outdoor unit shown in FIG. 12 includes a stator 902 formed by molding a stator core or the like with a resin mold body 940. A pair of upper and lower metal bearing housings 970 and 980 are attached to the stator 902, and the outer shell of the motor 901 is constituted by the stator 902 and the pair of bearing housings 970 and 980. The motor 901 is fixed to the casing of the outdoor unit, for example, in such a posture that the axis of the rotating shaft 904 is along the vertical direction. When power is supplied to the motor 901 via the lead wire 906, the rotating shaft 904 rotates and the fan attached to the rotating shaft 904 rotates.

  An effective means for reducing the temperature rise in the motor 901 is to improve the heat dissipation of the outer shell of the motor 901. For example, in the motor 901 according to Patent Document 1 and Patent Document 2, the surface area of the outer shell of the motor 901 is increased by providing a plurality of convex portions 943 on the outer peripheral surface 941 of the resin mold body 940, thereby radiating heat from the motor 901. Improves sex.

Japanese Patent No. 5288064 Japanese Patent No. 5288065

  However, the motor 901 has a design limitation, and the convex portion 943 cannot be freely provided on the outer peripheral surface 941 of the resin mold body 940. For this reason, the convex portion 943 may not be disposed in the vicinity of the heat source of the motor 901, so that the heat transfer efficiency deteriorates. In addition, the convex portions 943 may not be evenly arranged on the outer peripheral surface 941, and as a result, temperature non-uniformity occurs in the outer shell of the motor 901.

  Further, wind attracted by the rotation of the fan flows on the outer peripheral surface 941 of the motor 901, and the outer peripheral surface 941 is cooled by the wind. However, the convex portion 943 is formed on the outer peripheral surface 941 of the resin mold body 940. If the is provided, the flow of the wind is locally inhibited. Even in such a case, temperature non-uniformity occurs in the outer shell of the motor 901.

  As described above, if the heat transfer efficiency deteriorates or temperature non-uniformity occurs, the heat dissipation of the motor 901 may not be sufficient.

  Then, this indication aims at providing a motor with high heat dissipation.

  A motor according to an embodiment of the present disclosure includes a stator core formed of a yoke and a plurality of teeth, a stator formed by molding a winding wound around each of the plurality of teeth with a resin mold body, and a gap inside the stator. And a rotor rotatably held through the rotor, and a rotating shaft inserted in the center of the rotor. A plurality of convex portions are provided on the outer peripheral surface of the resin mold body at intervals along the circumferential direction, and at least one set of adjacent convex portions of the plurality of convex portions is the outer periphery of the resin mold body. It is connected by at least one connection part arranged with a gap between the surfaces.

  Since the motor according to the present disclosure includes a connecting portion that connects adjacent convex portions, heat dissipation is high.

It is a perspective view of the motor concerning an embodiment. It is a front view of the motor concerning an embodiment. It is 3-3 sectional drawing in FIG. 2 of the motor which concerns on embodiment. It is 4-4 sectional drawing in FIG. 3 of the motor which concerns on embodiment. 6 is a perspective view of a motor according to Modification 1. FIG. 6 is a cross-sectional view of a motor according to Modification 1. FIG. FIG. 10 is a cross-sectional view showing a main part of a motor according to modification example 2. FIG. 10 is a cross-sectional view showing a main part of a motor according to modification example 3. It is a perspective view which shows the motor which concerns on the modification 4. 10 is a perspective view showing a motor according to Modification 5. FIG. FIG. 10 is a cross-sectional view showing a motor according to Modification Example 5. It is a perspective view which shows the motor which concerns on a prior art example.

  Hereinafter, embodiments of a motor according to the present disclosure will be described with reference to the drawings. The embodiments disclosed below are illustrative in all respects and are not restrictive. The technical scope of the present disclosure is determined not by the content disclosed in the embodiment but by the description of the scope of claims, and further includes all modifications within the meaning and scope equivalent to the scope of claims. Should be understood.

  Hereinafter, embodiments will be described in detail with reference to the drawings as appropriate. However, more detailed description than necessary may be omitted. For example, detailed descriptions of already well-known matters and repeated descriptions for substantially the same configuration may be omitted. This is to avoid the following description from becoming unnecessarily redundant and to facilitate understanding by those skilled in the art.

  The accompanying drawings and the following description are provided to enable those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims.

  In the following embodiments, a motor for an air conditioner outdoor unit will be described as an example. Since the structure of the outdoor unit and the structure for fixing the motor to the casing of the outdoor unit are the same as those in the related art, description thereof is omitted here.

[Embodiment]
(Outline configuration)
FIG. 1 is a perspective view of a motor according to an embodiment. FIG. 2 is a front view of the motor according to the embodiment. 3 is a 3-3 cross-sectional view of the motor according to the embodiment shown in FIG. 4 is a cross-sectional view of the motor according to the embodiment, taken along line 4-4 in FIG. FIG. 3 is a cross-sectional view taken along a plane perpendicular to the axis of the rotation shaft of the motor, and FIG. 4 is a cross-sectional view taken along a plane including the axis of the rotation shaft of the motor.

  As shown in FIGS. 1 and 2, a motor 1 according to an embodiment is an inner rotor type motor for rotating a fan (not shown) of an outdoor unit of an air conditioner, and includes a stator 22 and a rotor 23 (see FIG. 1). 3), a rotating shaft 24, a pair of upper and lower bearing housings 5, and a plurality of lead wires 6.

  As shown in FIG. 4, the stator 22 has a substantially cylindrical shape, and is formed by molding the stator core 10, the plurality of insulators 20, and the plurality of windings 30 with a resin mold body 40.

  The stator core 10 is composed of a plurality of thin iron plates stacked, a substantially annular yoke 11, and a plurality (12 in this embodiment) of teeth 12 extending in the radial direction from the inner peripheral surface of the yoke 11. Consists of.

  Each insulator 20 is interposed between the stator core 10 and each winding 30 to electrically insulate the stator core 10 from each winding 30.

  Each winding 30 is wound around each tooth 12 of the stator core 10 in the radial direction of the yoke 11 in a winding form called concentrated winding. An insulator 20 is interposed between each winding 30 and each tooth 12.

  The resin mold body 40 is formed of a resin that seals the stator core 10, the insulator 20, and the winding 30. The outer shell of the motor 1 includes a resin mold body 40 and a pair of upper and lower bearing housings 5. As shown in FIG. 3, the outer peripheral surface 41 of the resin mold body 40 is provided with a plurality of fixing portions 42a to 42d, a plurality of convex portions 43a to 43l, and a plurality of connection portions 44a to 44h.

  Each of the fixing portions 42 a to 42 d is a member for fixing the motor 1 to a housing (not shown) of the outdoor unit, and is integrally formed with the resin mold body 40. The fixing portions 42 a to 42 d are arranged along the circumferential direction of the outer peripheral surface 41 with a space therebetween. Specifically, in the present embodiment, four fixing portions 42 a to 42 d are arranged at equal intervals of 90 ° with the axis J of the rotation shaft 24 as the center.

  The plurality of convex portions 43a to 43l and the plurality of connection portions 44a to 44h will be described later.

  The rotor 23 is disposed on the inner side of the stator 22 with a gap between the rotor 23 and the inner peripheral surface of the stator 22. The rotor 23 includes a rotor core 50 and a plurality of permanent magnets 60.

  The rotor core 50 is a substantially cylindrical member composed of a plurality of laminated thin iron plates, and is supported by a rotating shaft 24 that passes through the center.

  Each permanent magnet 60 is fitted into the outer peripheral surface of the rotor core 50. The permanent magnets 60 are arranged at equal intervals along the circumferential direction of the outer circumferential surface of the rotor core 50, and the respective longitudinal directions are substantially parallel to the axis J.

  As shown in FIG. 4, the rotating shaft 24 is a member for transmitting the rotational force generated by the motor 1 to the fan, and includes an upper bearing housing 70 and a lower bearing housing that constitute a pair of upper and lower bearing housings 5. By 80, it is supported up and down rotatably. The fan is attached to the upper end of the rotating shaft 24, for example. The motor 1 is appropriately fixed to the casing of the outdoor unit in an optimal posture according to the specifications of the outdoor unit. For example, the motor 1 is fixed to the casing of the outdoor unit in such a posture that the axis J is along the vertical direction. Or the motor 1 is fixed to the housing | casing of an outdoor unit with the attitude | position in which the shaft center J follows a horizontal direction.

  The upper bearing housing 70 is fixed to the upper end portion of the stator 22, and the lower bearing housing 80 is fixed to the lower end portion of the stator 22. The upper bearing housing 70 rotatably supports the upper side of the rotating shaft 24 via the upper bearing 71. Further, the lower bearing housing 80 supports the lower side of the rotary shaft 24 through the lower bearing 81 so as to be freely rotatable. The rotor 23 fixed to the rotating shaft 24 rotates relative to the stator 22 to which the upper bearing housing 70 and the lower bearing housing 80 are fixed.

  The lead wire 6 is a power supply line for supplying power to the motor 1. By energizing the winding 30 at an appropriate position according to the position of the permanent magnet 60, the rotating shaft 24 rotates and the fan attached to the rotating shaft 24 rotates. Energization is performed using a drive unit (not shown) such as an inverter. The drive unit may exist inside the motor 1 or may exist outside.

(Main part configuration)
The plurality of convex portions 43a to 43l and the plurality of connection portions 44a to 44h will be described in detail.

  Each convex part 43a-431 is a site | part for improving the heat dissipation of the motor 1. As shown in FIG. As shown in FIG. 3, the convex portions 43 a to 43 l are arranged along the circumferential direction of the outer peripheral surface 41 with an interval. Specifically, in the present embodiment, twelve convex portions 43a to 43l are arranged at equal intervals of 30 ° with the axis J as the center. A portion between adjacent convex portions, that is, a portion where the convex portions 43a to 43l on the outer peripheral surface 41 of the resin mold body 40 are not provided is a concave portion relative to the convex portions 43a to 43l. Accordingly, the outer peripheral surface 41 of the resin mold body 40 is in a state where the convex portions 43a to 43l and the concave portions are alternately provided. Each recess is disposed at the same angular position as the tooth 12 with respect to the axis J.

  Each of the convex portions 43a to 43l is a long plate having a substantially uniform thickness, the longitudinal direction of the convex portions 43a to 43l being along the axis J, and the axis J from the outer peripheral surface 41 of the resin mold body 40 as the center. It is provided so as to extend radially. In other words, a part of the outer peripheral surface 41 of the resin mold body 40 is in a state of extending in a direction (radial direction) orthogonal to the axis J and extending in a direction along the axis J. Four sets of adjacent convex portions among the plurality of convex portions 43a to 43l are connected by fixing portions 42a to 42d. Specifically, the lower part of the convex part 43b and the convex part 43c is connected by the fixing part 42a. Moreover, the lower part of the convex part 43e and the convex part 43f is connected by the fixed part 42b. Moreover, the lower part of the convex part 43h and the convex part 43i is connected by the fixed part 42c. Moreover, the lower part of the convex part 43k and the convex part 43l is connected by the fixed part 42d. These convex portions 43a to 43l are adjusted in position, number and shape as appropriate according to the design constraints of the motor 1 (motor size constraints, positions and shapes of the fixing portions 42a to 42d, positions of the lead wires 6, etc.). be able to.

  By providing such convex portions 43 a to 43 l on the outer peripheral surface 41 of the resin mold body 40, the surface area of the outer shell of the motor 1 is increased. Therefore, the motor 1 can efficiently dissipate heat generated in the winding 30 that is a heat generation source of the motor 1 into the outside air via the teeth 12 and the resin mold body 40. Therefore, the heat dissipation of the motor 1 is improved.

  Each of the connecting portions 44 a to 44 h is for further improving the heat dissipation of the motor 1, and is arranged with a space along the circumferential direction of the outer peripheral surface 41. Specifically, in the present embodiment, eight connecting portions 44a to 44h are provided between the convex portions where the fixing portions 42a to 42d do not exist among the adjacent convex portions. More specifically, between the convex portion 43a and the convex portion 43b, between the convex portion 43c and the convex portion 43d, between the convex portion 43d and the convex portion 43e, between the convex portion 43f and the convex portion 43g, Provided at eight locations between the convex portion 43g and the convex portion 43h, between the convex portion 43i and the convex portion 43j, between the convex portion 43j and the convex portion 43k, and between the convex portion 43l and the convex portion 43a. Yes. Further, the connection portions 44 a to 44 h are disposed at the same angular position as the tooth 12 with respect to the axis J.

  Each of the connection portions 44 a to 44 h is a plate shape having a substantially uniform thickness curved along the outer peripheral surface 41 of the resin mold body 40, and is disposed in a state where a gap is provided between the connection portions 44 a to 44 h and the outer peripheral surface 41. . Therefore, an air passage through which air flows is formed on the outer peripheral surface 41 of the resin mold body 40, that is, between the outer peripheral surface 41 and each of the connection portions 44 a to 44 h. As shown in FIG. 4, the gap between the outer peripheral surface 41 of the resin mold body 40 and each of the connection portions 44 a to 44 h has a width W in a direction orthogonal to the axis J and substantially uniform in the direction along the axis J. is there. That is, the opening area of the air passage through which the air flows is substantially uniform in the direction along the axis J.

  By providing such connection portions 44 a to 44 h on the outer peripheral surface 41 of the resin mold body 40, the surface area of the outer shell of the motor 1 is further increased. Therefore, the motor 1 can release the heat generated in the winding 30 that is a heat generation source of the motor 1 to the outside more efficiently through the teeth 12 and the resin mold body 40.

  Moreover, compared with the case where the convex parts 43a-431 are not connected by the connection parts 44a-44h, the motor 1 does not accumulate | store heat only in a specific convex part, and it is adjacent through the connection parts 44a-44h. Heat can also be dispersed in the convex portions. Therefore, the motor 1 is less likely to cause temperature nonuniformity in the outer shell of the motor 1.

  In addition, the motor 1 can rectify the wind that is attracted by the rotation of the fan and flows on the outer peripheral surface 41 of the resin mold body 40 by the connecting portions 44a to 44h. Therefore, the motor 1 can smoothly dissipate the heat of the resin mold body 40 into the outside air with a smooth wind flow.

  In the motor 1, the connection portions 44 a to 44 h are arranged at the same angular position as the teeth 12 with respect to the axis J. Therefore, the motor 1 is configured so that the heat generated in the winding 30 that is a heat generation source and transmitted to the resin mold body 40 via the teeth 12 is improved by the air flowing through the gaps between the outer peripheral surface 41 and the connection portions 44a to 44h. Can dissipate well into the open air.

  In summary, since the heat dissipation of the motor 1 is further improved, the temperature rise of the winding 30 can be suppressed.

  Moreover, with the configuration as described above, the dimension of the motor 1 does not increase in the direction along the axis J. Moreover, since each connection part 44a-44h is plate shape curved along the outer peripheral surface 41, the dimension of the motor 1 does not increase in the direction (radial direction) orthogonal to the shaft center J. Furthermore, the shape of the resin mold body 40 may be changed, and the design change of the stator core 10 is not necessary. Therefore, the heat dissipation of the motor 1 can be improved without increasing the size of the motor 1 with a simple structure and low cost.

[Modification]
Below, the modification of the motor 1 which concerns on the said embodiment is demonstrated. The motors according to the first to fifth modifications are different from the motor 1 according to the above-described embodiment in the configuration relating to the connecting portion. Other configurations are basically the same as those of the motor 1 according to the above embodiment. Therefore, only the difference will be described in detail, and the description of other configurations will be simplified or omitted. In addition, when the same member as the said embodiment is used, it demonstrates using the same code | symbol as the said embodiment.

(Modification 1)
FIG. 5 is a perspective view of a motor according to the first modification. FIG. 6 is a cross-sectional view of a motor according to the first modification.

  As shown in FIG. 5, in the motor 101 according to the first modification, each connection portion 144 is inclined obliquely with respect to the outer peripheral surface 41 of the resin mold body 40. Specifically, as shown in FIG. 6, the width W in the direction perpendicular to the axis J of the gap between the outer peripheral surface 41 and each connection portion 144 gradually decreases along the axis J. . In this respect, the motor 101 according to the modified example 1 is different from the motor 1 according to the above embodiment. In addition, although the motor 101 which concerns on the modification 1 is provided between the 8 adjacent convex parts similarly to the said embodiment, only one part has appeared in FIG.5 and FIG.6. .

  Each connecting portion 144 is a plate having a substantially uniform thickness that is curved along the outer peripheral surface 41 of the resin mold body 40, and is disposed in a state where a gap is provided between the connecting portion 144 and the outer peripheral surface 41. . However, since the width W gradually decreases upward along the axis J, the opening area of the air passage through which the air flows decreases toward the upper direction along the axis J. Therefore, the wind that is attracted by the rotation of the fan and flows on the outer peripheral surface 41 of the resin mold body 40 from the bottom to the top can be narrowed in the air passage, and the effect of rectifying the wind is increased. Therefore, the flow of wind becomes smoother and the heat of the resin mold body 40 can be dissipated more efficiently into the outside air.

  Moreover, the effects obtained by the connecting portions 44a to 44h according to the above-described embodiment can also be obtained by the connecting portion 144 according to the first modification.

  In the motor according to the present disclosure, the width W in the direction perpendicular to the axis J of the gap between the outer peripheral surface of the resin mold body and each connection portion depends on the direction of the wind flowing on the outer peripheral surface of the resin mold body. The configuration may be such that it gradually decreases in the downward direction along the axis J.

(Modification 2)
FIG. 7 is a cross-sectional view showing a main part of a motor according to the second modification.

  The connection part 244 according to the modification 2 as shown in FIG. 7 can also obtain the effect of narrowing and rectifying the wind in the air path produced by the connection part 144 according to the modification 1.

  In the first modification, the plate-like connection portion 144 having a uniform thickness is disposed obliquely with respect to the outer peripheral surface 41 of the resin mold body 40. However, in the second modification, the outer surface 245 of the connection portion 244 is The resin mold body 40 is substantially parallel to the outer peripheral surface 41. However, since the thickness of the connecting portion 244 gradually increases along the axis J, the opening area of the air passage through which the air flows decreases as it goes upward along the axis J. Therefore, the flow of wind becomes smoother and the heat of the resin mold body 40 can be dissipated more efficiently into the outside air.

  In addition, since the heat capacity of the connecting portion 244 is increased by increasing the thickness of the connecting portion 244, the connecting portion 244 can take more heat from the heat source.

(Modification 3)
FIG. 8 is a cross-sectional view showing a main part of a motor according to the third modification.

  The connection part 344 according to Modification 3 as shown in FIG. 8 can also obtain the effect of narrowing and rectifying the wind in the air path produced by the connection part 144 according to Modification 1.

  In the first modification, one connecting portion 144 is arranged between each adjacent convex portion. In the third modified example, three connecting portions 344 are arranged between each adjacent convex portion. Even with such a configuration, the opening area of the air passage through which the air flows becomes smaller as it goes upward along the axis J, so that the air flow becomes smoother.

  In addition, since the surface area of the resin mold body 40 is increased by increasing the number of the connecting portions 344, heat can be more efficiently dissipated into the outside air.

  In addition, the number of connection parts arrange | positioned between each adjacent convex part is not limited to three, It can be made into arbitrary numbers.

(Modification 4)
FIG. 9 is a perspective view showing a motor according to the fourth modification.

  As shown in FIG. 9, the motor 401 according to the modified example 4 is different from the motor 1 according to the above-described embodiment in that each connection portion 444 is provided with one circular opening 445.

  If the opening 445 is provided in the connection portion 444 in this manner, air in the gap between the outer peripheral surface 41 of the resin mold body 40 and the connection portion 444 is likely to leak to the outside, so that the gap between the outer peripheral surface 41 and the connection portion 444 is eliminated. It becomes difficult to burn heat. Moreover, the surface area of the resin mold body 40 can be increased. Therefore, heat can be dissipated more efficiently into the outside air.

  Note that the number of openings provided in the connection portion is not limited to one and may be any number. Further, instead of providing an opening, a slit or notch may be provided. Moreover, it is good also considering a connection part as a grid | lattice form or a mesh form.

(Modification 5)
FIG. 10 is a perspective view showing a motor according to the fifth modification. FIG. 11 is a cross-sectional view showing a motor according to the fifth modification.

  As shown in FIGS. 10 and 11, the motor 501 according to the modified example 5 is provided with connection portions 44 a to 44 h and 544 i to 544 l over the entire circumference of the resin mold body 40. This point is different from the motor 1 according to the above-described embodiment in which the connection portions 44a to 44h are provided only on a part of the entire circumference.

  In the motor 501 according to the modified example 5, all of the adjacent convex portions are connected by the connection portions 44a to 44h and 544i to 544l. That is, the convex portions 43b and the convex portions 43c, the convex portions 43e and the convex portions 43f, the convex portions 43h and the convex portions 43i, and the convex portions 43k and the convex portions 43l that are not connected in the above embodiment are also connected to the connecting portions 544i to 544l. Connected by.

  These adjacent convex portions are connected not only by the connection portions 544i to 544l but also by the fixing portions 542a to 542d. Each of the fixing portions 542a to 542d protrudes from the connection portions 544i to 544l so as to extend radially about the axis J. Therefore, when the motor 501 is fixed to the casing of the outdoor unit via the fixing portions 542a to 542d, the connection portions 544i to 544l do not get in the way.

  If it is set as the structure by which the connection parts 44a-44h and 544i-544l are provided over the perimeter of the resin mold body 40, even if the calorie | heat amount transmitted to each convex part 43a-431 is not constant, connection parts 44a-44h , 544i to 544l, the temperature can be made uniform over the entire circumference of the resin mold body 40. Even when the plurality of convex portions 43 a to 43 l cannot be arranged at equal intervals in the circumferential direction of the outer peripheral surface 41, the temperature can be made uniform over the entire circumference of the resin mold body 40. Therefore, the location close to the heat source is unlikely to be locally hot, and the heat dissipation of the motor 501 is further improved.

  Moreover, the speed of the wind flowing through the gaps between the outer peripheral surface 41 of the resin mold body 40 and the connection portions 44a to 44h and 544i to 544l is also made uniform over the entire circumference by making the temperature uniform over the entire circumference. Therefore, the air flowing on the outer peripheral surface 41 of the resin mold body 40 can be further rectified, and the heat dissipation of the motor 501 is further improved.

[Summary]
As described above, the configuration of the present disclosure has been described based on the embodiment and the modification. However, the present disclosure is not limited to the embodiment and the modification. For example, a motor obtained by appropriately combining the partial configurations of the motor according to the embodiment and the modification may be used. In addition, the materials, numerical values, and the like described in the embodiments are merely preferable examples, and are not limited thereto. Further, it is possible to appropriately change the configuration of the motor without departing from the scope of the technical idea of the present disclosure.

  The motor according to the present disclosure can improve heat dissipation without excessive increase in motor dimensions and cost, and can provide a small and high-performance motor. Suitable for applications that require small size and high performance in equipment.

DESCRIPTION OF SYMBOLS 1,101,401,501,901 Motor 5 A pair of upper and lower bearing housings 6,906 Lead wire 10 Stator core 11 Yoke 12 Teeth 20 Insulator 22, 902 Stator 23 Rotor 24, 904 Rotating shaft 30 Winding 40, 940 Resin mold Body 41, 941 Outer peripheral surface 42a-42d, 542a-542d Fixed part 43a-431, 943 Convex part 44a-44h, 144, 244, 344, 444, 544i-544l Connection part 50 Rotor core 60 Permanent magnet 70 Upper bearing housing 71 Upper side Bearing 80 Lower bearing housing 81 Lower bearing 245 Outside surface 445 Opening 970, 980 Bearing housing W Width in a direction perpendicular to the axis of the rotating shaft

Claims (3)

A stator formed by molding a stator core composed of a yoke and a plurality of teeth and a winding wound around each of the plurality of teeth with a resin mold;
A rotor rotatably held inside the stator via a gap;
A rotating shaft inserted into the center of the rotor,
A plurality of convex portions are provided on the outer peripheral surface of the resin mold body at intervals along the circumferential direction, and at least one set of adjacent convex portions of the plurality of convex portions is provided in the resin mold. A motor characterized in that the motor is connected by at least one connecting portion arranged with a gap between it and the outer peripheral surface of the body.   The motor according to claim 1, wherein a width of the gap in a direction perpendicular to the axis of the rotation shaft is gradually increased or decreased along the axis.   The motor according to claim 1, wherein the connection portion is disposed at the same angular position as the teeth with respect to the axis of the rotating shaft.

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