WO2006114890A1

WO2006114890A1 - Stator of outer rotor motor

Info

Publication number: WO2006114890A1
Application number: PCT/JP2005/007838
Authority: WO
Inventors: Kouichi Takamune; Manabu Kobayashi; Kouki Naka; Kazumasa Ito; Satoshi Yamashiro
Original assignee: Mitsubishi Denki Kabushiki Kaisha
Priority date: 2005-04-25
Filing date: 2005-04-25
Publication date: 2006-11-02
Also published as: JPWO2006114890A1

Abstract

A stator of an outer rotor motor arranged in such way that a plurality of core elements divided in units of magnetic pole including the magnetic pole portion and the yoke portion are coupled on the coupling face of the yoke portion and attached integrally to the motor in a ring shape. The stator of an outer rotor motor comprises: a first core element where both coupling faces at the yoke portion are formed to be inclined so that the motor core side recedes farther from the center line of the magnetic pole portion and having an inner end face coupled with the motor core; a second core element where both coupling faces at the yoke portion are formed to be inclined so that the motor core side approaches closer to the center line of the magnetic pole portion and coupled with the coupling face of the first core element; a fixed rod inserted into the yoke portion of the second core element in parallel with the motor core; and an end plate into which the end portion of the fixed rod is inserted and which couples the first and second core elements by pressing the fixed rod against the motor core side, thus coupling the first core element with the motor core.

Description

Specification

Stator of motor rotor type motor

Technical field

The present invention relates to a stator for an outer rotor type motor.

Background art

[0002] As a stator core of a conventional rotor rotor type motor, a core element divided into magnetic pole units composed of a yoke part, a magnetic pole part, and a claw part in an outer rotor type stator core is coupled to each other at the yoke part, so that a plurality of core elements are combined. A stator core of a motor that is integrally assembled in a ring shape, wherein a lower projecting arm portion is provided on one side of a yoke portion in each core element, and an upper projecting arm portion is provided on the other side. Each opposing downward projecting arm and upward projecting arm can be connected to each other so as to be movable within a predetermined range in the circumferential direction, and the core elements are assembled together in a ring-like state. The retainer teeth are embedded in the joints between the downward projecting arms and the upward projecting arms, and then multiple core elements are ringed. There is mounted respectively the retainer from each side of the core assembly assembled together (for example, see Patent Document 1

) o

[0003] Further, as a stator core of another conventional outer rotor type motor, a stator core of a motor in which a plurality of core elements are integrally assembled in a ring shape, on one side of a yoke portion in each core element. Lower protruding claws are provided on the other side, and upper protruding claws are provided on the other side, and the opposing lower protruding claws and upper protruding claws of adjacent core elements are engaged with each other, and the core elements are arranged in a ring shape. The parallel rod is inserted into the hole provided in the yoke part of each core element in parallel with the rotation axis, and the parallel rod receives the radial force acting on each core element ( For example, see Patent Document 2).

[0004] Patent Document 1: Japanese Patent Application Laid-Open No. 2003-199270

Patent Document 2: Japanese Patent Laid-Open No. 2000-050583

Disclosure of the invention

Problems to be solved by the invention However, when the stator core of the conventional outer rotor type motor is assembled, it is necessary to insert retainer teeth or parallel rods into all the core elements. When the motor has a large number of core elements, There were many problems with the number of parts and the number of machining operations.

[0006] The present invention has been made in view of the above, and an object of the present invention is to obtain a stator of an outer rotor type motor having a reduced number of parts and processing man-hours.

Means for solving the problem

[0007] In order to solve the above-described problems and achieve the object, the present invention combines a plurality of core elements divided into magnetic pole units including a magnetic pole part and a yoke part at the joint surface of the yoke part, In the stator of an outer rotor type motor that is integrally attached to the motor shaft in a ring shape, both coupling surfaces of the yoke portion are separated from the center line of the magnetic pole portion toward the motor shaft. The first core element having an inner end surface formed to be inclined and coupled to the motor shaft core, and both coupling surfaces of the yoke portion are closer to the center line of the magnetic pole portion toward the motor shaft side. The second core element is formed so as to be inclined so as to approach, and the coupling surface is coupled to the coupling surface of the first core element; the yoke portion of the second core element; and the motor shaft core A fixed rod inserted in parallel, and an end of the fixed rod An end plate that is inserted and connects the first and second core elements by pressing the fixing rod toward the motor axis, and connects the first core element to the motor axis. It is characterized by providing.

The invention's effect

[0008] The stator of the outer rotor type motor that is effective in the present invention has an effect that a gap is not formed between the coupling surfaces of the first and second core elements with a small number of parts and a small number of processing steps. Brief Description of Drawings

FIG. 1 is a cross-sectional view taken along a plane perpendicular to the motor central axis of the stator of the first embodiment.

FIG. 2 is a sectional view taken along the motor central axis of the stator.

FIG. 3 is a perspective view showing an end plate of the stator.

FIG. 4 is a perspective view showing a modification of the end plate of the stator.

[FIG. 5-1] FIG. 5-1 is a diagram showing a method for adjusting the gap between the coupling surfaces of the core elements. [Fig. 5-2] Fig. 5-2 is a diagram showing a method of adjusting the gap between the coupling surfaces of the core elements.

FIG. 6 is a cross-sectional view taken along a plane orthogonal to the motor central axis of the stator of the second embodiment.

FIG. 7 is a sectional view taken along the motor central axis of the stator according to the third embodiment.

FIG. 8 is a perspective view showing an end plate of the stator.

FIG. 9 is a cross-sectional view along the motor central axis showing a modification of the end plate of the stator.

FIG. 10 is a front view showing a modification of the end plate of the stator.

FIG. 11 is a front view showing another modification of the end plate of the stator.

Explanation of symbols

1 First core element

2 Second core element

la, 2a nail

lb, 2b magnetic pole

lc, 2c Yoke part

Id, 2d bonding surface

le, 2e Inner end face

2f fixing hole

lg ant groove

2g Convex

lm, 2m Magnetic pole center line

3 Sleeve (motor shaft core)

4 Fixed rod

5, 9, 35, 45, 55 End plate

5a hole

6 Motor center shaft

9a, 35a U-shaped groove

45a Circular cam surface

55a Tightening part BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of a stator of an outer rotor type motor that is useful in the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

[0012] Embodiment 1.

FIG. 1 is a cross-sectional view taken along a plane perpendicular to the motor central axis of the stator according to Embodiment 1, FIG. 2 is a cross-sectional view taken along the motor central axis of the stator, and FIG. 3 shows an end plate of the stator. FIG.

In FIG. 1 and FIG. 2, the stator 10 of Embodiment 1 is formed by laminating steel plates, and includes six megaphone-shaped first core elements 1 facing the motor central axis 6 direction, and steel plates. Six second core elements 2 in the shape of arrows that are formed in layers and point in the direction of the motor central axis 6 and the first and second core elements 1 and 2 are alternately connected and installed in a ring shape. A cylindrical sleeve 3 as a motor shaft core, two end plates 7 fitted between both ends of the sleeve 3 and sandwiching the first and second core elements 1 and 2, and a second core element 2 and an end plate 7 and a fixed rod 4 that couples the first core element 1 to the sleeve 3 by pressing the second core element 2 in the direction of the motor shaft core (sleeve 3).

[0014] The first core element 1 has a claw portion la that becomes an outer peripheral end portion of the stator 10, a magnetic pole portion lb on which a coil is mounted, and a yoke portion lc. Both coupling surfaces ld and Id on the side surface of the yoke part lc are formed so as to be inclined so as to be separated from the center line lm force of the magnetic pole part lb toward the motor shaft core 3 side, and inclined approximately 15 ° with respect to the center line lm. It is an inclined surface. An arc-shaped inner end face le that is coupled to the sleeve 3 as the motor shaft core is formed at the inner peripheral end of the yoke part lc. The second core element 2 includes a claw portion 2a that is an outer peripheral end portion of the stator 10, a magnetic pole portion 2b on which a coil is mounted, and a yoke portion 2c. Both coupling surfaces 2d and 2d on the side surface of the yoke portion 2c are formed so as to be inclined closer to the center line 2m of the magnetic pole portion 2b toward the motor shaft core 3 side, and inclined by approximately 45 ° with respect to the center line 2m. It is a surface. The yoke portion 2c is provided with a fixing hole 2f parallel to the motor central shaft 6.

[0015] When the first and second core elements 1 and 2 are alternately connected in a ring shape by the yoke portions lc and 2c and installed on the sleeve 3, the connecting surfaces ld and 2d are in close contact with each other, and the first Yoke part 1 of core element 1 The arc-shaped inner end surface le of c is in close contact with the outer peripheral surface of the sleeve 3, and the inner end surface 2e of the yoke portion 2c of the second core element 2 is formed so that the outer peripheral surface force of the sleeve 3 is also separated. It has been.

As shown in FIG. 3, the ring-shaped end plate 5 has six holes 5a arranged in a ring shape for passing through the end of the fixed rod 4 at equal intervals in the circumferential direction. Is provided. The pitch diameter φ θ of the holes 5a of the end plate 5 is shown in FIG. 2 where the first and second core elements 1 and 2 are alternately arranged by the yoke parts lc and 2c.

2

It is designed to be smaller than the pitch diameter φD of the fixed rod 4 passed through the fixed hole 2f of the second core element 2 when it is connected to the ring 3 and installed on the sleeve 3.

1

[0017] When assembling the end plate 5 to the sleeve 3, the end plate 5 is heated and expanded to fix the pitch diameter φD.

2 Pass the fixed rod 4 through the hole 5a of the end plate 5 according to the pitch diameter D of the rod 4. After assembly is complete

1

The temperature of the end plate 7 returns to room temperature and contracts, and it is tightly fitted to the sleeve 3. At the same time, the end plate 5 presses the fixing rod 4 toward the sleeve 3.

[0018] When the fixing rod 4 is pressed toward the sleeve 3, the second core element 2 is pressed toward the sleeve 3, and the coupling surfaces 2d and 2d are connected to the coupling surfaces ld and Id of the first core element 1, respectively. The sleeve is pressed toward the sleeve 3 so that the coupling surfaces ld and 2d are in close contact with each other and the inner end face le of the first core element 1 is coupled to the outer circumferential surface of the sleeve 3. In this way, the first and second core elements 1 and 2, the fixing rod 4, the end plate 5 and the sleeve 3 are coupled to each other, and the stator 10 is assembled.

[0019] Although not shown, the coil is mounted on the magnetic pole portions lb and 2b before the first and second core elements 1 and 2 are raised. Since it is equipped before assembling, the density of the coil can be increased by carrying out concentrated filing.

FIG. 4 shows an end plate 9 as a modification of the end plate 5. On the inner peripheral portion of the ring-shaped end plate 9, six U-shaped grooves 9 a for inserting the fixing rod 4 are provided at equal intervals in the circumferential direction. The pitch diameter φ D of the U-shaped groove 9a of the end plate 9 is determined by the first and second core elements 1 and 2 shown in FIG.

Three

When coupled on the sleeve 3 alternately in the shape of a ring at the parts lc and 2c, it is smaller than the pitch diameter φ D of the fixed rod 4 threaded through the fixed hole 2f of the second core element 2. To design

1

Has been.

[0021] When assembling the end plate 9 to the sleeve 3, the end plate 9 is heated and expanded to fix the pitch diameter φD.

3 Pass the fixed rod 4 through the U-shaped groove 9a of the end plate 9 according to the pitch diameter D of the rod 4. Assembly completed After completion, the temperature of the end plate 9 returns to normal temperature and contracts, and it is tightly fitted to the sleeve 3. At the same time, the end plate 9 presses the fixing rod 4 toward the sleeve 3.

[0022] When the fixing rod 4 is pressed toward the sleeve 3, the second core element 2 is pressed toward the sleeve 3, and the coupling surfaces 2d and 2d are coupled to the coupling surfaces ld and Id of the first core element 1, respectively. The sleeve is pressed toward the sleeve 3 so that the coupling surfaces ld and 2d are in close contact with each other and the inner end face le of the first core element 1 is coupled to the outer circumferential surface of the sleeve 3. In this manner, the first and second core elements 1 and 2, the fixing rod 4, the end plate 9 and the sleeve 3 are coupled to each other, and the stator 10 is assembled.

[0023] In the stator of the conventional outer rotor type motor disclosed in Patent Documents 1 and 2, the circumferential direction of the lower protruding arm portion (lower protruding claw) and the upper protruding arm portion (upward protruding claw) of the yoke portion of the core element The width dimension is minus (one) tolerance so that when the core elements are joined together at the yoke and multiple core elements are assembled together in a ring shape, the circumferential width dimension is too large to prevent assembly. Produced. For this reason, a negative tolerance is accumulated in proportion to the number of core elements to be assembled, and a gap is generated between the yoke portions of the core elements.

[0024] In the stator 10 of the first embodiment, no gap is generated between the yoke portions lc and 2c even if the first and second core elements 1 and 2 are manufactured with a negative tolerance. The reason will be explained with reference to Figure 5-1. Even if the first core element 1 is manufactured to be narrow as indicated by the broken line, the second core element 2 is pressed against the sleeve 3 by the fixing rod 4, so that the second core element 2 is Displacement to the 3 side brings the bonding surface lcT of the first core element Γ into close contact with the bonding surface 2d of the second core element 2. Accordingly, there is no gap between the yoke parts lc and 2c. Even if the second core element 2 is manufactured to be narrow, no gap is generated between the yoke portions lc and 2c in the same manner as described above. Even if the first and second core elements 1 and 2 are made wide, the second core element 2 can be displaced to the outer peripheral side, so that it cannot be assembled! /.

[0025] As shown in FIG. 5-1, when the angle formed by the center line 2m of the second core element 2 and the coupling surface 2d is 0, the circumferential direction of the first core element 1 is Depending on the tolerance, the radial displacement of the second core element 2 is proportional to lZtan Θ. Therefore, when the angle Θ is increased, the radial displacement amount of the second core element 2 can be reduced.

However, if the angle Θ is too large, as shown in FIG. 5-2, the first core element 1 must have a surface If different from the coupling surface Id, and the surface lf , If there is a gap between Is done. Further, the fixing hole 2f (fixing rod 4) of the second core element 2 is to be placed near the base of the magnetic pole portion 2b.

[0027] Magnetic flux concentrates in the vicinity of the base of the magnetic pole part 2b. Therefore, if the fixed rod 4 and the gap are arranged in the vicinity of the base of the magnetic pole part 2b, the magnetic flux is disturbed to deteriorate the efficiency of the motor. In the stator 10 of Embodiment 1 shown in FIG. 1, the coupling surface 2d is disposed near the base of the magnetic pole part 2b of the second core element 2 to eliminate the gap, and the angle Θ is relatively large. The amount of radial displacement of the second core element 2 is reduced.

[0028] The width of the magnetic pole portion lb of the first core element 1 and the width of the magnetic pole portion 2b of the second core element 2 are different dimensions, and the magnetic pole portions of the first and second core elements 1 and 2 are different. A stator 10 may be provided in which a coil is mounted on one of lb and 2b and a coil is not mounted on the other.

[0029] Embodiment 2.

FIG. 6 is a cross-sectional view taken along a plane orthogonal to the motor central axis of stator 20 of the second embodiment. In FIG. 6, the same components as those shown in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted. The stator core 20 of the second embodiment is provided with dovetail grooves lg on both side surfaces of the yoke portion lc of the first core element 21, and loosely fitted into the dovetail grooves lg on both side surfaces of the yoke portion 2c of the second core element 22. Protruding part 2g is provided.

[0030] When the dovetail groove lg and the convex portion 2g are fitted together, the first core element 21 and the second core element 22 are connected to each other and assembled into a ring shape. Since it does not come off when fitted with the convex part 2g, the ring shape can be maintained without using an assembly jig or the like during the assembly of the stator 20, and the assembly workability is improved. The connection of the first and second core elements 21 and 22 and the sleeve 3 by the fixing rod 4 and the end plate 5 (9) is the same as that of the stator 10 of the first embodiment.

[0031] Embodiment 3.

7 is a cross-sectional view taken along the motor central axis of the stator 30 of the third embodiment, FIG. 8 is a perspective view showing the end plate 35 of the third embodiment, and FIG. 9 is an end view of the stator 30. FIG. 10 is a cross-sectional view along the motor central axis showing a modified example of the plate, FIG. 10 is a front view showing an end plate 45 as a modified example of the end plate 35, and FIG. FIG. 10 is a front view showing an end plate 55 as a modified example. In the third embodiment, the first and second core elements 1 and 2 (21 and 22), the fixing rod 4 and the sleeve 3 are the same as those shown in the first and second embodiments, and the description thereof is omitted. . [0032] As shown in Figs. 7 and 8, the end plate 35 is formed in a ring shape, and six U-shaped grooves 35a for inserting the fixing rod 4 into the inner peripheral portion are equally spaced in the circumferential direction. A rod insertion portion 35b provided on the inner surface, and an inner diameter smaller than that of the lot insertion portion 35b. The bolt insertion hole 35d is provided, and the attachment portion 35c is attached to the sleeve 3.

[0033] The pitch diameter φ D on the inlet side of the U-shaped groove 35a is equal to the aforementioned pitch of the fixed rod 4 shown in FIG.

Four

The pitch diameter φ D on the inner side of the U-shaped groove 35a is larger than the pitch diameter φ D.

1 5

It is formed smaller than D, and the U-shaped groove 35a is an inclined groove. Provided on mounting part 35c

1

The four bolt through holes 35d are provided at positions facing the four screw holes 3a provided on both end faces of the sleeve 3.

[0034] As shown in FIG. 7, the fixing rod 4 inserted through the second core element 2 is inserted into the U-shaped groove 35a of the end plate 35, and the bolt 36 is inserted into the screw hole of the sleeve 3 through the bolt through hole 35d. As it is screwed into 3a, the end plate 35 gradually approaches the end of the sleeve 3, and the end of the fixed rod 4 slides to the back side of the U-shaped groove 35a, and the U-shaped groove 35a The fixed rod 4 is pushed to the sleeve 3 side by the inclination of.

[0035] When the fixing rod 4 is pressed toward the sleeve 3, the second core element 2 is pressed toward the sleeve 3, and the coupling surfaces 2d and 2d are connected to the coupling surfaces ld and Id of the first core element 1, respectively. The sleeve is pressed toward the sleeve 3 so that the coupling surfaces ld and 2d are in close contact with each other and the inner end face le of the first core element 1 is coupled to the outer circumferential surface of the sleeve 3. In this way, the first and second core elements 1 and 2, the fixing rod 4, the end plate 35 and the sleeve 3 are coupled to each other, and the stator 30 is assembled.

FIG. 9 and FIG. 10 show an end plate 45 as a modified example of the end plate 35. As shown in FIG. 10, the end plate 45 is formed in a ring shape and has a rod insertion portion 45b in which a circular cam surface 45a is formed on the inner peripheral portion and an inner diameter smaller than that of the rod insertion portion 45b. A large number of bolt through holes 45 5d are provided in a shape, and an attachment portion 45c attached to the end of the sleeve 3 is provided.

[0037] The maximum inner diameter φD of the circular cam surface 45a is the aforementioned pitch diameter φ of the fixed lot 4 shown in FIG.

6

D is larger than D, and the minimum inner diameter φ の of the circular cam surface 45a is the pitch diameter φ of the fixed rod 4

1 7

It is smaller than D. A number of bolt holes 45d provided in the mounting part 45c are

1

It is provided at a position facing a large number of screw holes 3 a provided on both end faces of the leave 3.

[0038] As shown in FIG. 9, the end of the fixed rod 4 inserted through the second core element 2 is connected to the end of the end plate 45. Rotate the end plate 45 to the position indicated by the broken line in the direction of arrow A in FIG. 10 and tilt the circular cam surface 45a in the direction 6 of the motor central axis toward the sleeve 3 side. Press.

[0039] When the fixing rod 4 is pressed toward the sleeve 3, the second core element 2 is pressed toward the sleeve 3, and the coupling surfaces 2d and 2d are coupled to the coupling surfaces ld and Id of the first core element 1, respectively. The sleeve is pressed toward the sleeve 3 so that the coupling surfaces ld and 2d are in close contact with each other and the inner end face le of the first core element 1 is coupled to the outer circumferential surface of the sleeve 3.

[0040] Among the large number of bolt through holes 45d provided in the mounting portion 45c, the screw holes are passed through the bolts 36 into the plurality of holes whose circumferential positions coincide with the large number of screw holes 3a provided on both end faces of the sleeve 3. The first and second core elements 1 and 2, the fixing rod 4, the end plate 45 and the sleeve 3 are coupled to each other by screwing into the 3 a and the stator core 30 is assembled.

FIG. 11 shows an end plate 55 as another modification of the end plate 35. As shown in FIG. 11, the end plate 55 is formed in a snap ring shape, and has tightening portions 55a at both ends.

[0042] The fixing rod 4 inserted through the second core element 2 is inserted into the inner peripheral portion of the end plate 55, and the tightening portion 55a is tightened in the direction of arrow B in FIG. The end plate 55 is deformed in the direction of arrow C to the position indicated by the broken line, and the fixing rod 4 is pressed toward the sleeve 3 side.

[0043] When the fixing rod 4 is pressed toward the sleeve 3, the second core element 2 is pressed toward the sleeve 3, and the coupling surfaces 2d and 2d are connected to the coupling surfaces ld and Id of the first core element 1, respectively. The sleeve is pressed toward the sleeve 3 so that the coupling surfaces ld and 2d are in close contact with each other and the inner end face le of the first core element 1 is coupled to the outer circumferential surface of the sleeve 3. In this way, the first and second core elements 1 and 2, the fixing rod 4, the end plate 55 and the sleeve 3 are coupled together, and the stator 30 is assembled.

As described above, the sleeve 3 as the force motor shaft core described for the stators of the outer rotor type motors of Embodiments 1 to 3 has no hollow portion and may be a shaft!

Industrial applicability

[0045] As described above, the stator of the outer rotor type motor that is effective in the present invention is low in cost with few parts and machining 'assembly man-hours', and has a gap between the coupling surfaces of the first and second core elements. Because it is not possible! /, It is useful as a stator with high efficiency without disturbing the magnetic flux.

Claims

The scope of the claims

[1] A water rotor type motor in which a plurality of core elements divided into magnetic pole units including a magnetic pole part and a yoke part are coupled to each other at the coupling surface of the yoke part, and are integrally assembled in a ring shape on the motor shaft core In this stator, both coupling surfaces of the yoke portion are formed so as to be inclined so that the center line force of the magnetic pole portion is separated toward the motor shaft core side, and an inner end surface coupled to the motor shaft core is formed. A first core element formed,

Both coupling surfaces of the yoke portion are formed so as to be closer to the center line of the magnetic pole portion toward the motor shaft, and the coupling surface is coupled to the coupling surface of the first core element. Core elements of

A fixed rod inserted through the yoke portion of the second core element in parallel with the motor shaft; and

An end portion of the fixed rod is inserted, and the first and second core elements are coupled to each other by pressing the fixed rod toward the motor shaft core side, and the first core element is connected to the motor shaft core. An end plate to be coupled to,

A stator of an outer rotor type motor, comprising:

[2] The water rotor according to claim 1, wherein a side surface of the first core element has a dovetail groove, and a side surface of the second core element has a convex portion that fits into the dovetail groove. Stator of type motor.

[3] The pitch diameter at room temperature of the plurality of holes in the end plate, which are arranged in a ring shape and into which the end portion of the fixed rod is inserted, has the first and second core elements alternately in the ring shape. 2. The stator of an outer rotor type motor according to claim 1, wherein the stator is smaller than a pitch diameter of the fixed rod when coupled and installed on the motor shaft.

[4] The pitch diameter at room temperature of the plurality of grooves arranged in a ring shape in the end plate into which the end portions of the fixed rod are inserted is such that the first and second core elements are alternately ring-shaped. 2. The stator of an outer rotor type motor according to claim 1, wherein the stator is smaller than the pitch diameter of the fixed rod when coupled and installed on the motor shaft.

[5] A plurality of grooves of the end plate that are arranged in a ring shape and into which end portions of the fixed rod are inserted. The pitch diameter on the inlet side is formed larger than the pitch diameter of the fixed rod when the first and second core elements are alternately connected in a ring shape and installed on the motor shaft, 2. The stator of an outer rotor type motor according to claim 1, wherein a pitch diameter of the stator rotor is formed smaller than a pitch diameter of the fixed rod, and the groove is an inclined groove.

[6] The end plate is formed in a ring shape, and a circular cam surface is formed on an inner peripheral portion into which the end portion of the fixed rod is inserted, and the maximum inner diameter of the circular cam surface is the first and second When the core elements are alternately coupled in a ring shape and installed on the motor shaft, the core element is formed larger than the pitch diameter of the fixed rod, and the minimum inner diameter of the circular cam surface is the pitch diameter of the fixed rod. 2. The stator of an outer rotor type motor according to claim 1, wherein the stator is smaller.

7. The end plate according to claim 1, wherein the end plate is formed in a snap ring shape having a tightening portion at both end portions and an end portion of the fixed rod being inserted into an inner peripheral portion. Water rotor type motor stator.

8. The stator of the outer rotor type motor according to claim 1, wherein a coil is mounted only on one of the magnetic pole portions of the first and second core elements.