Motor and method of manufacturing the same

Abstract

To provide a motor technique which does not require the step of setting an insulation distance or winding a tape around a coil end in order to insulate the coil end and a housing body.SOLUTION: The present invention relates to a motor comprising: a rotor 8; a stator 9 which is disposed at a centrifugal side of the rotor 8; a housing body 6 in which the stator 9 is accommodated; and first insulation sheets 41a and 41b insulating coil ends 19a and 19b of the stator 9 and an inner wall part of the housing body 6. The first insulation sheets 41a and 41b include: cylindrical first portions 42a and 42b covering outer peripheral portions 22a and 22b of the coil ends 19a and 19b; and second portions 43a and 43b extending from ends of the first portions 42a and 42b to the side of an axis line C1 of the rotor 8 and covering at least a part of the coil ends 19a and 19b. In the second portions 43a and 43b, pleats 46 and 46 are formed by being folded in a circumferential direction while alternately repeating ridge-folding and valley-folding so as to reduce a diameter toward an edge side.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a technique for electrically insulating a stator of a motor from its housing. [Background technology]

[0002] Conventionally, motors have been known that include a rotor that rotates due to a rotating magnetic field and a stator that generates the rotating magnetic field. The stator has a core inside which the rotor is placed and multiple coils wound around the core. The ends of the stator are called coil ends, which are formed by the portions of the coils that are exposed from the core in the axial direction of the rotor. Generally, stators are housed in a housing made of a conductive material, and insulation between the stator coil ends and the housing is required. Insulation between the stator coil ends and the housing is achieved by providing a predetermined gap (insulation distance) between the stator coil ends and the inner wall of the housing.

[0003] The size of the stator tends to increase as the motor's output is increased. On the other hand, the smaller the housing size, the more compact the motor. However, achieving both a compact motor and high output is limited by the insulation distance required between the stator coil end and the inner wall of the housing.

[0004] Therefore, an insulation method has been proposed in which insulating tape is wrapped around the coil ends of the stator in a bandage-like manner, thereby maintaining insulation at the coil ends without creating an insulating distance between the coil ends of the stator and the inner wall of the housing (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 5-300684 Summary of the Invention [Problem to be solved by the invention]

[0006] However, winding the tape around the coil ends of the stator is a labor-intensive task that must be performed manually, and this increases manufacturing costs, especially in the mass production of motors.

[0007] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a motor and a method for manufacturing the motor that does not require the steps of setting an insulation distance or wrapping tape around the coil ends to insulate the coil ends from the housing. [Means for solving the problem]

[0008] A first aspect of the present invention relates to a motor including a rotor that rotates due to a rotating magnetic field, a stator that is disposed on the centrifugal side of the rotor and generates the rotating magnetic field, and a housing formed of an electrical conductor and that houses the stator, the stator having a core inside which the rotor is disposed and a plurality of coils wound around the core, with coil ends formed by portions of the plurality of coils that are exposed from the core in the axial direction of the rotor, and the motor also includes a first insulating sheet disposed between the coil ends of the stator and an inner wall of the housing. The first insulating sheet has a cylindrical first portion that covers the outer periphery of the coil ends, and a second portion that extends from an end of the first portion toward the rotor axis and covers at least a portion of the coil ends, and the second portion is formed with pleats that are folded circumferentially with alternating mountain folds and valley folds so that the diameter decreases toward the edge.

[0009] According to the motor of the first aspect of the present invention, there is no need to set an insulation distance or to wind tape around the coil ends in order to insulate the coil ends from the housing.

[0010] A motor according to a second aspect of the present invention is characterized in that, in the motor according to the first aspect, it further comprises an isolation tube made of an electrical conductor that separates the space in which the stator is provided from the space in which the rotor is provided, and a second insulating sheet that extends radially outward from the isolation tube, has an outer peripheral edge that is positioned between the second part of the first insulating sheet and the coil end, and covers at least a portion of the coil end.

[0011] A motor according to a third aspect of the present invention is characterized in that, in the motor according to the second aspect, it further comprises a third insulating sheet disposed between the isolation tube and the coil end and attached to the isolation tube side.

[0012] A motor according to a fourth aspect of the present invention is a motor according to any one of the first to third aspects, characterized in that the coil end is provided with a lead wire for power supply, the housing is formed with a lead wire outlet for leading the lead wire from the inside to the outside, the lead wire passes around the outer periphery of the coil end and is drawn out from the lead wire outlet to the outside of the housing, and the first part is provided with a recessed portion that straddles the lead wire at a position corresponding to the lead wire.

[0013] The "lead wire" is used to supply power to the stator, and is separate from the coil that forms the coil end and is connected to the coil, or it may be the coil itself pulled out from the coil end.

[0014] A motor manufacturing method according to a fifth aspect of the present invention includes a first step of forming a cylindrical body by rolling an insulating sheet into a cylindrical shape, and a second step of forming a second part of the first insulating sheet by folding the cylindrical body formed by the first step at an intermediate portion so that the annular end of the cylindrical body faces radially inward, and folding the annular end in a circumferential direction while alternately repeating mountain folds and valley folds so that the diameter of the annular end decreases toward the edge, thereby forming pleats. [Effects of the Invention]

[0015] According to the present invention, it is possible to provide a motor and a method for manufacturing the motor that do not require a step of setting an insulation distance or wrapping tape around the coil end to insulate the coil end from the housing. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a partial cross-sectional view of a canned motor pump including a motor according to an embodiment of the present invention. [Figure 2] FIG. 2 is an enlarged view of a main part of the canned motor pump of FIG. 1. [Figure 3] 2 is a perspective view of a first insulating sheet provided in the motor shown in FIG. 1. FIG. [Figure 4] 2 is a front view of a first insulating sheet provided in the motor shown in FIG. 1. FIG. [Figure 5] FIG. 3 is a process diagram illustrating a manufacturing process of the first insulating sheet according to the embodiment of the present invention. [Figure 6] 4 is an explanatory view of a first folding process for forming a second portion of the first insulating sheet shown in FIG. 3. FIG. [Figure 7] 4 is an explanatory view of a second folding process for forming a second portion of the first insulating sheet shown in FIG. 3. FIG. [Figure 8] 4 is a diagram showing a structure and an insulating sheet piece for avoiding interference with lead wires in the first insulating sheet shown in FIG. 3. FIG. [Figure 9] 2 is a front view of a second insulating sheet provided in the motor shown in FIG. 1. FIG. [Figure 10] 2 is a perspective view showing a stator can, a reinforcing tube, and a third insulating sheet in the motor shown in FIG. 1. FIG. [Figure 11] 2 is a perspective view showing a stator can, a frame, a first insulating sheet, a second insulating sheet, a third insulating sheet, etc. in the motor shown in FIG. 1. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0017] A motor according to an embodiment of the present invention will be described below with reference to the accompanying drawings. In this embodiment, a motor 2 incorporated into a canned motor pump 1 will be described as shown in Figure 1. In addition to the motor 2, the canned motor pump 1 includes a pump 3 driven by the motor 2.

[0018] The motor 2 includes a housing 6 including a frame 4 and stator side plates 25a and 25b, brackets 5a and 5b, a rotating shaft 7, a rotor 8 that rotates due to a rotating magnetic field, and a stator 9 that is disposed outside the rotor 8 and generates a rotating magnetic field. The frame 4, brackets 5a and 5b, and stator side plates 25a and 25b are made of electrical conductors. The frame 4 is generally cylindrical in shape.

[0019] The rotary shaft 7 is rotatably supported by two bearings 12a and 12b. The bearings 12a and 12b are provided in bearing housings 15a and 15b formed in the brackets 5a and 5b, respectively, via sleeves 10a and 10b.

[0020] The rotor 8 includes a cylindrical rotor can 10, a rotor body 11 arranged inside the rotor can 10, a magnet 14 held by the rotor body 11, and a yoke 13. The rotor 8 is fixed to the rotating shaft 7 and rotates together with the rotating shaft 7. The rotor can 10 and the rotor body 11 are welded together, sealing the internal structure including the magnet 14.

[0021] The stator 9 is housed in the housing 6. The stator 9 has a core 17 including an annular iron core inside which the rotor 8 is disposed, and a plurality of coils 18, 18... wound around the core 17 to generate a rotating magnetic field. Each of the coils 18, 18... is exposed from both ends of the core 17 in the direction along the axis C1 and is bundled in an annular shape along the end face of the core 17 to form coil ends 19a, 19b. Power supply lead wires 20, 20... are connected to each of the coils 18, 18... that form one coil end 19b. Note that the lead wires 20, 20... may be formed from a portion of each of the coils 18, 18...

[0022] The frame 4 is provided with a lead wire outlet 21 for leading out each of the lead wires 20, 20... to the outside. Each of the lead wires 20, 20... passes from the end face portion 23b of the coil end 19b through the outer circumferential portion 22b of the coil end 19b, and is drawn out of the housing 6 (4, 25a, 25b) from the lead wire outlet 21.

[0023] 1, outer circumferential portions 22a, 22b of coil ends 19a, 19b are portions of coil ends 19a, 19b that face inner wall portions 401 of frame 4 and require insulation from inner wall portions 401. End face portions 23a, 23b of coil ends 19a, 19b face inner wall portions 251a, 251b of stator side plates 25a, 25b, respectively, and require insulation from inner wall portions 251a, 251b.

[0024] Stator side plates 25a and 25b are provided on both ends of the frame 4. The stator side plates 25a and 25b are fixed to the frame 4 via first sealing O-rings 26a and 26b, and are also fixed to brackets 5a and 5b via second sealing O-rings 27a and 27b.

[0025] An isolation tube 16 is provided between the rotor 8 and the stator 9, separating the rotor space 29 in which the rotor 8 is provided from the stator space 30 in which the stator 9 is provided. In this embodiment, the isolation tube 16 is formed by a stator can 31 and reinforcing tubes 32a, 32b. The dimension of the stator can 31 in the direction of the axis C1 is set to be longer than the dimension of the coil ends 19a, 19b in the direction of the axis C1. The reinforcing tubes 32a, 32b are provided in areas of the outer circumferential surface of the stator can 31 facing the coil ends 19a, 19b, and reinforce the stator can 31. The stator can 31 and the reinforcing tubes 32a, 32b are made of electrical conductors.

[0026] The stator space 30 in the accommodating body 6 is sealed watertight by the isolation tube 16 , and the rotor space 29 is also sealed watertight by the brackets 5 a and 5 b , the stator side plates 25 a and 25 b , and the stator can 31 .

[0027] The pump 3 includes a pump casing 33 and an impeller 34. The impeller 34 is fixed to one end of the rotary shaft 7 and rotates with the rotation of the rotor 8. The rotation of the impeller 34 causes the fluid taken in through the suction port 35 of the pump casing 33 to be discharged from the discharge port 36. A portion of the fluid taken in through the suction port 35 flows into the rotor space 29, circulates within the rotor space 29, then returns to the pump casing 33 and flows toward the discharge port 36.

[0028] Figure 2 shows an enlarged view of the main parts of the motor 2 shown in Figure 1. As shown in Figure 2, the motor 2 includes first insulating sheets 41a, 41b, insulating sheet pieces 52, second insulating sheets 55a, 55b, and third insulating sheets 58a, 58b for insulating the coil ends 19a, 19b from the surrounding structure. Each of the insulating sheets is made of, for example, Nomex (registered trademark) aramid fiber. Note that only a portion of each insulating sheet is shown in Figures 1 and 2.

[0029] Each of the insulating sheets will be described in detail below. The first insulating sheet 41a shown on the right side of FIG. 2 and the first insulating sheet 41b shown on the left side of FIG. 2 have a symmetrical shape and structure, except for some differences. The second insulating sheet 55a, the third insulating sheet 58a, etc. shown on the right side of FIG. 2 and the second insulating sheet 55b, the third insulating sheet 58b, etc. shown on the left side of FIG. 2 also have a symmetrical shape and structure. Therefore, the following will first describe the first insulating sheet 41a shown on the right side of FIG. 2, omit a description of the first insulating sheet 41b shown on the left side of FIG. 2 as appropriate, and only describe the aforementioned partial differences. Then, the second insulating sheet 55a, the third insulating sheet 58a, etc. shown on the right side of FIG. 2 will be described, and a description of the second insulating sheet 55b, the third insulating sheet 58b, etc. shown on the left side of FIG. 2 will be omitted.

[0030] The first insulating sheet 41a is composed of a first portion 42a arranged between the outer circumferential portion 22a of the coil end 19a and the inner wall portion 401 of the frame 4, and a second portion 43a arranged between the end face portion 23a of the coil end 19a and the inner wall portion 251a of the stator side plate 25a. The first portion 42a and the second portion 43a are made of a single insulating sheet.

[0031] The first portion 42a of the first insulating sheet 41a is a cylinder that surrounds and covers the outer periphery 22a of the coil end 19a. The dimension of the first portion 42a in the direction along the axis C1 is set according to the internal structure of the housing 6, and is set, for example, so that one end contacts the end of the core 17 of the stator 9 and the other end is spaced apart from the stator side plate 25a.

[0032] The second portion 43a of the first insulating sheet 41a is an annular body extending from an end of the first portion 42a toward the axis C1. As shown in Figures 3 and 4, the second portion 43a is folded circumferentially while alternately forming mountain folds 44 and valley folds 45, forming a number of pleats 46, which form an annular shape whose diameter decreases toward the edge closer to the axis C1.

[0033] The width W1 of the second portion 43a from the edge on the first portion 42a side to the edge on the axis C1 side is set so that the second portion 43a covers at least a portion of the coil end 19a, preferably so that the second portion 43a covers from the radially outer end to the radially inner end of the end surface 23a of the coil end 19a. In other words, the width W1 of the second portion 43a is preferably set so that the second portion 43a covers the entire end surface 23a of the coil end 19a. The width W1 of the second portion 43a may be set to any value that can cover the entire end surface 23a of the coil end 19a in combination with a second insulating sheet 55a described below.

[0034] As shown in FIG. 5, the first insulating sheet 41a is manufactured through a first step and a second step.

[0035] In the first step, a planar insulating sheet X is rolled into a cylindrical shape to form a cylindrical insulating sheet Y. The insulating sheet X may be, for example, a rectangular insulating sheet.

[0036] In the second step, the cylindrical insulating sheet Y formed in the first step is folded at the middle part Ya in the direction of the center line C2 so that its annular end Yb faces radially inward, and the annular end Yb is folded circumferentially, alternately making mountain folds and valley folds so that the diameter decreases toward the edge of the annular end Yb, thereby forming pleats 46, 46...

[0037] The second step can be performed by various methods. For example, as shown in Fig. 6, a plurality of bending start points 48, 48... are set along the circumferential direction of the cylindrical insulating sheet Y created in the first step, and at each bending start point 48, 48..., the middle portion Ya of the cylindrical insulating sheet Y is bent in a direction D1 toward the center line C2 of the insulating sheet Y, which is radially inward, to change the orientation of the annular end portion Yb. As a result, a bending start line 49 (see Fig. 3) is formed in the cylindrical insulating sheet Y. The portion that remains as a cylinder on either side of the bending start line 49 becomes the first portion 42a.

[0038] Next, the multiple protrusions 50, 50... formed between the folding start points 48, 48... shown in Figure 6 are folded in the circumferential direction D2 of the cylindrical insulating sheet Y as shown in Figure 7. By folding the protrusions 50, 50..., pleats 46, 46... with a sawtooth cross section consisting of mountain folds 44 and valley folds 45 are formed, creating the annular second portion 43a. Through the above procedure, the first insulating sheet 41a shown in Figure 3 is created.

[0039] As shown in FIG. 2, the first insulating sheet 41b is composed of a first portion 42b arranged between the outer peripheral portion 22b of the coil end 19b, on which the lead wires 20, 20... are provided, and the inner wall portion 401 of the frame 4, and a second portion 43b arranged between the end face portion 23b of the coil end 19b and the inner wall portion 251b of the stator side plate 25b.

[0040] Next, we will explain the configuration of first insulating sheet 41b and its surroundings shown on the left side of Fig. 2. First insulating sheet 41b shown on the left side of Fig. 2 has substantially the same shape and structure as first insulating sheet 41a shown on the right side of the figure, except that it has cutouts that serve as a connection structure for lead wires 20, 20...

[0041] That is, the first insulating sheet 41b shown on the left side in Figure 2 has a first concave cutout portion 51 (concave portion) cut out in a U-shape that straddles the multiple lead wires 20, 20... guided to the lead wire outlet 21 at a position corresponding to the lead wire outlet 21 of the first part 42b of the first insulating sheet 41b, as shown in Figure 8.

[0042] 2 and 8, an insulating sheet piece 52 is arranged at a position in the first portion 42b of the first insulating sheet 41b corresponding to the first concave cutout portion 51. The insulating sheet piece 52 has a dimension along the axis C1 that is set to be the same as or smaller than the dimension of the first portion 42b, and is arranged inside the first portion 42b so as to cover the first concave cutout portion 51 of the first portion 42b when viewed radially of the first portion 42b.

[0043] When the insulating sheet piece 52 is disposed inside the first portion 42b as described above, the insulating sheet piece 52 has a second concave cutout 53 at the end of the first insulating sheet 41b on the side adjacent to the second portion 43b. The dimension of the second concave cutout 53 in the direction along the axis C1 is, for example, smaller than half the dimension of the first concave cutout 51, and the dimension of the second portion 43b in the direction along the circumferential direction is, for example, approximately the same as the dimension of the first concave cutout 51. The lead wires 20, 20... are guided through the outer surface side of the insulating sheet piece 52 to the lead wire outlet 21, and most of the lead wires 20, 20 do not come into direct contact with the coils 18, 18... of the coil end 19b.

[0044] Next, the second insulating sheet 55a shown on the right side in Fig. 2 will be described. As shown in Fig. 2, the second insulating sheet 55a extends radially outward from the stator can 31 side, and its outer peripheral edge is disposed between the end face 23a of the coil end 19a and the inner wall 251a of the stator side plate 25a. In this embodiment, as shown in Fig. 9, the second insulating sheet 55a is annular and flat, and has an inner diameter R1 that is smaller than the outer diameter R2 of the reinforcing tube 32a.

[0045] By passing the reinforcing tube 32a through the opening 59a of the second insulating sheet 55a, the second insulating sheet 55a is held by the reinforcing tube 32a. As will be described later, a third insulating sheet 58a is attached to the outside of the reinforcing tube 32a, and friction between the second insulating sheet 55a and the third insulating sheet 58a makes it easy to maintain the position of the second insulating sheet 55a relative to the reinforcing tube 32a.

[0046] Second insulating sheet 55a covers a portion of end surface 23a of coil end 19a. When second insulating sheet 55a is fixed to reinforcing tube 32a, width W2 of the annular surface of second insulating sheet 55a is set so as to cover, for example, at least half of end surface 23a of coil end 19a from the inside to the outside.

[0047] The third insulating sheet 58a is formed, for example, by forming an adhesive layer on one side of an insulating aramid fiber layer, and is attached to the outer wall portion 321a of the reinforcing tube 32a arranged outside the stator can 31. In this embodiment, as shown in Fig. 10, the third insulating sheet 58a covers almost the entire outer circumferential surface of the reinforcing tube 32a except for the contact area S with the stator 9 and the stator side plate 25a. Note that the third insulating sheet 58a may cover the entire surface including the contact area S.

[0048] The third insulating sheet 58a is preferably attached to the outer wall portion 321a of the reinforcing pipe 32a in advance of the step of assembling the reinforcing pipe 32a in the manufacturing process of the canned motor pump 1. In the case of the third insulating sheet 58b shown on the left side in Fig. 1, it is attached to the outer wall portion 321b of the reinforcing pipe 32b.

[0049] As described above, in the motor 2 of the canned motor pump 1 of this embodiment, as shown in Fig. 11, the first insulating sheet 41a, the second insulating sheet 55a, and the third insulating sheet 58a provide insulation between the coil end 19a and the frame 4, between the coil end 19a and the reinforcing tube 32a, and between the coil end 19a and the stator side plate 25a (see Fig. 1). Furthermore, although not shown, the first insulating sheet 41b, the second insulating sheet 55b, and the third insulating sheet 58b also provide insulation over the entire area between the coil end 19b and the frame 4, between the coil end 19b and the reinforcing tube 32b, and between the coil end 19b and the stator side plate 25b (see Fig. 1).

[0050] In this way, in the motor 2, the coil ends 19a, 19b are insulated from the housing 6 and the isolation tube 16 without using the conventional method of wrapping insulating tape around the coil ends 19a, 19b like a bandage.

[0051] Here, the first insulating sheets 41a, 41b provided on the motor 2 have a three-dimensional shape with the first portions 42a, 42b and the second portions 43a, 43b, so that the coil ends 19a, 19b can be covered and insulated three-dimensionally without the need to prepare and arrange multiple insulating sheets. Also, because the second portions 43a, 43b are held by the first portions 42a, 42b, no additional element is required to prevent the second portions 43a, 43b from shifting in a direction perpendicular to the axis C1.

[0052] Furthermore, since coil ends 19a, 19b can be insulated from housing 6 and isolation tube 16 as long as there is enough space to place first insulating sheets 41a, 41b, there is no need to ensure an insulating distance in motor 2. Therefore, it is possible to achieve both compactness and high output for canned motor pump 1 and motor 2 without being restricted by ensuring an insulating distance.

[0053] The first insulating sheet 41b is also provided with a first concave cutout 51 that straddles the lead wires 20, 20.... Therefore, by simply aligning the position of the first concave cutout 51 with the position of the lead wires 20, 20... and inserting the first insulating sheet 41b into the gap between the coil end 19b and the frame 4, it is possible to easily and reliably cover and insulate the coil end 19b while avoiding interference with the lead wires 20, 20....

[0054] Additionally, an insulating sheet piece 52 is disposed in a position corresponding to the first recessed cutout portion 51 of the first insulating sheet 41b, and the lead wires 20, 20... are guided through the upper surface of the insulating sheet piece 52 to the lead wire outlet 21. This prevents direct contact between the lead wires 20, 20... and the coils 18, 18... at the coil end 19b. Therefore, the motor 2 is less likely to experience a short circuit due to deterioration of the coating material of the lead wires 20, 20... caused by heat from the coil end 19b.

[0055] Furthermore, in the motor 2, the inner diameter R1 of the second insulating sheets 55a, 55b is set smaller than the outer diameter R2 of the reinforcing tubes 32a, 32b, so that the positions of the second insulating sheets 55a, 55b can be fixed without using adhesive or other fixing means, thereby reducing the workload for insulation.

[0056] Although the motor according to the present invention has been described above based on one embodiment, the specific configuration is not limited to this embodiment. For example, although each of the insulating sheets such as first insulating sheets 41a, 41b is made of an aramid fiber material such as Nomex (registered trademark), each of the insulating sheets such as first insulating sheets 41a, 41b may be made of another material that is less conductive to electricity than the housing body 6 and the isolation tube 16.

[0057] Furthermore, the cylindrical first portions 42a, 42b and the annular second portions 43a, 43b constituting the first insulating sheets 41a, 41b may have an incomplete cylindrical shape or an incomplete ring shape, respectively. For example, the cylindrical first portions 42a, 42b and the annular second portions 43a, 43b may have a shape constituting a part of a semicircle or other circle when viewed from the direction of the axis C1 of the rotor 8, and may be divided into multiple parts.

[0058] The motor 2 according to this embodiment is incorporated into a canned motor pump, but the present invention is also applicable to other motors, and its scope of application is not limited to canned motor pumps. [Industrial Applicability]

[0059] The present invention can be applied to, for example, a motor including a rotor, a stator, and a housing that houses the stator. [Explanation of symbols]

[0060] 1 Canned motor pump 2 motors 6 Containment Unit 401 Inner wall of frame (inner wall of housing) 8 rotors 9 Stator 16 Isolation tube 17 cores 18,18... Coil 19a, 19b coil end 22a, 22b Outer periphery of coil end 23a, 23b End surface of coil end 20,20... Lead wire 21 Lead wire outlet 251a, 251b Inner wall portion of stator side plate (inner wall portion of container) 29 Rotor Space 30 Stator space 41a, 41b First insulating sheet 42a, 42b First part of first insulating sheet 43a, 43b Second part of the first insulating sheet 44,44... Mountain fold 45,45... Valley fold 46,46... Pleats 51 First concave cutout portion (concave portion) 55a, 55b Second insulating sheet 58a, 58b Third insulating sheet C1 Rotor axis D2 Circumferential direction Y Cylindrical insulating sheet (cylindrical body) Ya Midway of the cylindrical insulating sheet Yb Annular end of cylindrical insulating sheet

Claims

1. a rotor that rotates due to a rotating magnetic field; a stator disposed on the centrifugal side of the rotor and generating the rotating magnetic field; a housing formed using an electrical conductor and housing the stator; Equipped with the stator has a core inside which the rotor is disposed and a plurality of coils wound around the core, a motor in which coil ends are formed by portions of the plurality of coils that are exposed from the core in the axial direction of the rotor, a first insulating sheet disposed between the coil end of the stator and an inner wall portion of the housing; The first insulating sheet comprises: a cylindrical first portion that covers an outer periphery of the coil end; a second portion extending from an end of the first portion toward the axis of the rotor and covering at least a portion of the coil end; and The second portion has pleats formed by folding in the circumferential direction while alternately repeating mountain folds and valley folds so that the diameter decreases toward the edge. A motor characterized by:

2. 2. The motor according to claim 1, an isolation tube made of an electrical conductor that separates a space in which the stator is provided from a space in which the rotor is provided; a second insulating sheet extending radially outward from the isolation tube, with an outer peripheral edge portion disposed between the second portion of the first insulating sheet and the coil end, and covering at least a portion of the coil end; The motor further comprises:

3. 3. The motor according to claim 2, The motor further comprises a third insulating sheet disposed between the isolation tube and the coil end and attached to the isolation tube side.

4. 4. The motor according to claim 1, A lead wire for power supply is provided at the coil end, The housing has a lead wire outlet formed therein for leading the lead wire from inside to outside, the lead wire passes through an outer periphery of the coil end and is drawn out from the lead wire outlet to the outside of the housing, The motor is characterized in that the first portion is provided with a recessed portion that straddles the lead wire at a position corresponding to the lead wire.

5. 2. A method for manufacturing a motor according to claim 1, comprising the steps of: a first step of rolling an insulating sheet into a cylindrical shape to form a cylindrical body; a second step of bending the cylindrical body formed in the first step at a midpoint to direct the annular end of the cylindrical body radially inward, and forming pleats by folding the cylindrical body in a circumferential direction while alternately repeating mountain folds and valley folds so that the diameter of the annular end decreases toward the edge of the annular end, thereby forming a second portion of the first insulating sheet; A method for manufacturing a motor, comprising:

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