JP2013021892A - Manufacturing method of stator of permanent magnet type motor and stator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase packing density of distributed wound windings 21 with respect to slot portions 15 of a stator 11 as much as possible and to sufficiently enhance performance of a permanent magnet type motor.SOLUTION: A manufacturing method of a stator of a permanent magnet type motor comprises the steps of: forming a straight core 25 in which each tooth portion 14 provided on a yoke portion 13 substantially linearly extending is divided into a first divided portion 14b of one side of the yoke portion 13 in a longitudinal direction and a second divided portion 14c of the other side thereof by a notch portion 14a notched from a leading end of the tooth portions 14 toward a base end side; subsequently accommodating windings 21 in slot portions 15 such that the windings 21 are wound about the tooth portions 14 of the straight core 25 by distributed winding; and subsequently bending the yoke portion 13 of the straight core 25 in a substantially annular shape such that the tooth portions 14 are positioned at an inner peripheral side and the first divided portion 14b and the second divided portion 14c of each tooth portion 14 are brought into intimate contact with each other.

Description

  The present invention belongs to a technical field related to a method for manufacturing a stator of a permanent magnet motor and a stator disposed on the outer peripheral side of a rotor core provided with a permanent magnet.

  In general, a stator of a permanent magnet motor is provided with a yoke portion formed in a substantially annular shape and a plurality of teeth provided on the inner peripheral surface of the yoke portion and extending radially inward from each other at intervals in the circumferential direction. Part, a slot part formed between the adjacent tooth parts, and a winding housed in the slot part so as to be wound around the tooth part. In the case of distributed winding, the winding is wound across two or more tooth portions among the plurality of tooth portions.

  When manufacturing the stator, for example, as disclosed in Patent Document 1, a winding is positioned on the inner peripheral side of a tooth portion or a slot portion provided in a substantially annular yoke portion, and the winding is disposed on the yoke. It is made to move to the outer side in the radial direction of the part and inserted into the slot part from the opening of the slot part.

International Publication No. 2003/012961 Pamphlet

  By the way, when the winding is distributed winding, the packing density (that is, the number of turns) of the winding in the slot portion tends to be lower than that of concentrated winding. In addition, as described above, in the method in which the winding is moved from the inner peripheral side of the tooth portion or slot portion to the radially outer side of the yoke portion and inserted into the slot portion, the winding is positioned at both ends of the tooth portion straddling. Since the distance of the teeth portion increases toward the outer side of the yoke portion in the radial direction, the winding (coil) must be enlarged as the winding moves to the outer side of the yoke portion in the radial direction. It is difficult to smoothly insert the wire into the slot, and this further reduces the packing density (number of turns) of the winding. For this reason, it is difficult to sufficiently improve the performance of the permanent magnet motor.

  The present invention has been made in view of such a point, and the object of the present invention is to increase the packing density of the distributed winding with respect to the slot portion of the stator as much as possible to sufficiently improve the performance of the permanent magnet motor. It is in trying to improve.

  To achieve the above object, according to the present invention, a yoke part extending substantially linearly is provided for a method of manufacturing a stator of a permanent magnet motor, which is disposed on the outer peripheral side of a rotor core provided with a permanent magnet. A plurality of teeth portions extending in a comb shape on the yoke portion, and slot portions formed between the adjacent tooth portions, wherein each tooth portion extends from the tip of the teeth portion. A first step of forming a straight core divided into a first divided part on one side in the longitudinal direction of the yoke part and a second divided part on the other side by a notch part cut toward the base end side, and After the first step, the second step of accommodating the winding in the slot portion so as to be wound around the teeth portion of the straight core by distributed winding; and after the second step, the yoke portion of the straight core The above tee Scan unit is located on the inner peripheral side and has to include a third step of bending the substantially annular so that the first divided portion of each tooth portion and the second division unit is in close contact with each other.

  As a result, the straight core is formed in the first step, the winding is accommodated in the slot portion of the straight core in the second step, and the yoke portion of the straight core is bent into a substantially annular shape in the third step. Thus, a stator of a permanent magnet motor can be obtained. In the second step, each of the windings (coils) wound so as to straddle two or more teeth portions is arranged so that two of the two or more tooth portions are located on both sides of the tooth portions located at both ends. When inserting into the slot portion, the winding (coil) may be moved straight toward the slot portion, and it is not necessary to expand the diameter of the winding (coil). As a result, the winding can be smoothly inserted into the slot portion. Therefore, it is possible to improve the packing density of the distributed winding with respect to the slot portion. Moreover, since the notch part is provided in the teeth part, the yoke part can be easily bent so as to have a predetermined diameter. On the other hand, even if such a notch portion is provided, the first divided portion and the second divided portion divided by the notch portion are in close contact with each other in a state where the yoke portion is bent in a substantially annular shape, A decrease in the performance of the permanent magnet motor can be suppressed.

  In the method of manufacturing a stator for a permanent magnet motor, the method further includes a fourth step in which, after the third step, the yoke portion bent in a substantially annular shape is disposed on the inner peripheral side of the substantially cylindrical case portion. It is preferable.

  Thus, the yoke portion can be easily and reliably held in a substantially annular shape by using the case portion. Further, in order to make the yoke portion easier to bend, the case portion can be used as a back yoke even if the length of the yoke portion in the extending direction of the tooth portion (the radial length of the bent yoke portion) is reduced. It is possible to ensure the performance of the permanent magnet motor. Therefore, the yoke portion can be easily bent into a substantially annular shape and the state thereof can be reliably held, and the deterioration of the performance of the permanent magnet motor due to the yoke portion being easily bent can be suppressed.

  The case portion is preferably a water-cooled case portion having a water jacket.

  By doing this, if the length of the yoke portion in the extending direction of the teeth portion is reduced as described above, the water jacket can be brought as close to the winding as possible, and the heat generation of the winding can be absorbed efficiently. And the fall of the performance of the permanent magnet type motor by the heat_generation | fever can be suppressed.

  Another aspect of the present invention is an invention of a stator of a permanent magnet type motor disposed on the outer peripheral side of a rotor core provided with a permanent magnet, and the stator is bent from a substantially linearly extending state and is substantially omitted. The annularly formed yoke portion and the plurality of teeth portions provided on the inner peripheral surface of the yoke portion and extending inwardly in the yoke portion radial direction at intervals in the yoke portion circumferential direction are adjacent to each other. A slot portion formed between the tooth portions, and a winding housed in the slot portion so as to be wound around the teeth portion by distributed winding, and each of the tooth portions has a substantially annular shape of the yoke portion. In the state before being bent into the first portion, the notched portion cut from the distal end of the tooth portion toward the proximal end side is divided into a first divided portion on one side in the longitudinal direction of the yoke portion and a second divided portion on the other side. It is divided and each tooth part 1 and the second dividing unit is a state where the yoke is bent into a substantially annular shape, it is an arrangement that is in close contact with each other.

  With this configuration, it is possible to insert the winding into the slot portion before bending the yoke portion, and in this way, it is possible to increase the packing density of the distributed winding with respect to the slot portion. Further, the notch allows the yoke part to be easily bent so as to have a predetermined diameter, and the first divided part and the second divided part are in close contact with each other. It is possible to suppress a decrease in the performance of the permanent magnet motor due to the portion.

  As described above, according to the method for manufacturing a stator of a permanent magnet motor and the stator of the present invention, the packing density of distributed windings in the slot can be improved, and the performance of the permanent magnet motor can be improved. Can be achieved.

It is a perspective view which shows a part of permanent magnet type motor provided with the stator which concerns on embodiment of this invention. It is the figure which looked at the manufacturing method of the said stator from the direction perpendicular | vertical to the yoke part longitudinal direction and the teeth part extension direction which shows the straight core (or stator core).

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows a part of a permanent magnet motor M provided with a stator 11 according to an embodiment of the present invention. In this embodiment, the permanent magnet motor M is an IPM motor used as a vehicle driving motor for an electric vehicle or a hybrid vehicle, and includes a rotor core 2 in which a plurality of permanent magnets 3 made of rare earth magnets or the like are embedded. And a stator 11 disposed coaxially on the outer peripheral side of the rotor core 2 of the rotor 1.

  A through hole 2a into which a rotation shaft (motor shaft) (not shown) is press-fitted is formed at the center (rotor axis) of the rotor core 2. The rotation shaft press-fitted into the through hole 2a and the rotor core 2 are connected to each other. Rotates integrally around the rotor axis. The rotor core 2 is formed by laminating a plurality of substantially ring-shaped electromagnetic steel plates in the rotor axial direction. The plurality of permanent magnets 3 are embedded in the outer peripheral portion in the rotor core 2 so as to be spaced apart from each other in the circumferential direction of the rotor and to extend in the axial direction of the rotor. In this embodiment, when viewed from the rotor axial direction, the permanent magnets 3 are arranged in a substantially V shape in which the distance between the permanent magnets 3 increases toward the outer side in the rotor radial direction. In the portion, eight substantially V-shaped magnetic poles composed of a pair of permanent magnets 3 are formed. In addition, arrangement | positioning of the permanent magnet 3 is not restricted to such arrangement | positioning. Moreover, the SPM motor in which the permanent magnet 3 is provided on the surface of the rotor core 2 may be used.

  The stator 11 includes a stator core 12 formed by laminating a plurality of electromagnetic steel plates, and a winding 21 that is energized from a DC power source via an inverter in order to rotate the rotor 1. The stator core 12 is provided on the inner circumferential surface of the yoke portion 13 which is bent from a substantially linearly extending state and formed in a substantially annular shape, and is spaced at equal intervals in the circumferential direction of the yoke portion 13. And a plurality of tooth portions 14 extending radially inward of the yoke portion 13. The teeth portions 14 extend toward the central axis of the substantially annular yoke portion 13 (that is, the central axis of the stator core 12 (coincident with the rotor axis)). The extension lengths of the plurality of teeth portions 14 are the same. A slot portion 15 in which the winding 21 is accommodated is formed between adjacent teeth portions 14.

  In the present embodiment, a substantially cylindrical case portion 16 is coaxially disposed on the outer peripheral side of the yoke portion 13. This case part 16 is comprised with iron, an electromagnetic steel plate, etc., and is used as a back yoke. That is, the length of the yoke portion 13 in the extending direction of the teeth portion (the length in the radial direction of the yoke portion 13 bent into a substantially annular shape) is set to a relatively small value equal to or less than a predetermined value. 13 is easy to bend. Thus, even if the length is small, in the present embodiment, the case portion 16 is used as a back yoke, so that a decrease in the performance of the permanent magnet motor M can be suppressed. Note that the lower limit value of the length may be set to a value having a strength capable of withstanding the press-fitting when the yoke part 13 is press-fitted into the inner peripheral part of the case part 16 as will be described later.

  The yoke portion 13 (stator core 12) is press-fitted into the inner peripheral portion of the case portion 16, and the outer peripheral surface of the yoke portion 13 and the inner peripheral surface of the case portion 16 are in close contact with each other. Further, both end surfaces in the longitudinal direction of the yoke portion 13 are in close contact with each other in a state of being bent into a substantially annular shape, and this close contact state (that is, a state bent in a substantially annular shape) It is held by press-fitting into the inner peripheral part of the part 16.

  Here, a positioning key (not shown) extending in the direction of the central axis of the yoke portion 13 is formed so as to protrude at at least one location on the outer peripheral surface of the yoke portion 13 in the circumferential direction. On the other hand, a key groove (not shown) into which the positioning key is fitted is formed on the inner peripheral surface of the case portion 16. The yoke portion 13 and the case portion 16 are positioned in the circumferential direction by fitting the positioning key and the key groove. As a result, after the yoke portion 13 is press-fitted into the inner peripheral portion of the case portion 16, the yoke portion 13 does not rotate with respect to the case portion 16. The position of the positioning key may be provided, for example, at the end of one side of the yoke 13 in the longitudinal direction. Alternatively, a split key is provided at both ends of the yoke 13 in the longitudinal direction, and the split key is brought into close contact with each other to form one positioning key in a state where the yoke 13 is bent into a substantially annular shape. It may be.

  In the present embodiment, the case portion 16 is a water-cooled case portion having a water jacket 17. The water jacket 17 has a plurality of axially extending portions 17 a that extend in the case portion cylinder axial direction and are provided at intervals in the circumferential direction. Opening is made only on one end face in the axial direction (end face on the near side in FIG. 1). These openings are closed by a substantially annular closing portion (not shown) provided on the end surface of the case portion 16 on one side in the cylinder axis direction. A flow path for connecting the plurality of axially extending portions 17a in series is provided at the end of the closing portion and the case portion 16 on the other side in the cylindrical axis direction, and thus the inside of the case portion 16 is provided. A water jacket 17 that makes about one turn is formed. A supply pipe and a discharge pipe (not shown) are connected to the water jacket 17, and cooling water is supplied to the water jacket 17 through the supply pipe, and the cooling water flows through the water jacket 17 to form a case portion. After about one round in 16, it is discharged through the discharge pipe.

  Since the radial length of the yoke portion 13 is as small as a predetermined value or less as described above, the water jacket 17 can be brought as close as possible to the winding 21 by providing the water jacket 17 on the case portion 16. The heat of 21 can be absorbed efficiently. Although the water jacket 17 is not always necessary, it is preferable to provide the water jacket 17 in the case of the vehicle driving motor as in this embodiment.

  Each tooth part 14 is a notch part cut from the tip of the tooth part 14 toward the base end before the yoke part 13 is bent into a substantially annular shape (a state extending in a substantially linear shape). By 14a, it divides | segments into the 1st division part 14b of the yoke part longitudinal direction one side, and the 2nd division part 14c of the other side (refer Fig.2 (a)). The notch portion 14a is substantially V-shaped when viewed from a direction perpendicular to the longitudinal direction of the yoke portion and the extending direction of the teeth portion, and the first and second divided portions 14b and 14c are also substantially V-shaped as a whole. I am doing. That is, the side surfaces of the notch portion 14a on both sides in the longitudinal direction of the yoke portion (side surfaces opposite to each other of the first and second divided portions 14b and 14c sandwiching the notch portion 14a) are spaced from each other. It extends so as to narrow toward the base end side, and is connected to each other in the vicinity of the base end of the tooth portion 14. The angle between the side surfaces on both sides is such that the both side surfaces are in close contact with each other when the yoke portion 13 is bent in a substantially annular shape (that is, the first divided portion 14b and the second divided portion 14c are The angles are such that they are in close contact with each other. As a result, the first and second divided portions 14b and 14c of each tooth portion 14 are in close contact with each other with the yoke portion 13 bent in a substantially annular shape (see FIG. 2D). . In FIG. 1, the boundary line between the first divided portion 14b and the second divided portion 14c that are in close contact with each other is omitted.

  The winding 21 is accommodated in the slot portion 15 so as to be wound around the tooth portion 14 by distributed winding. That is, the winding 21 (coil) is wound over two or more tooth portions 14 among all the tooth portions 14 of the stator core 12 (in this embodiment, the winding 21 is wound over the three tooth portions 14). Suppose it is). The slot portion 15 has a length in the longitudinal direction of the yoke portion of the slot portion 15, that is, the first divided portion 14 b (or the second divided portion 14 c) of one of the adjacent tooth portions 14. The distance between the other tooth portion 14 and the second divided portion 14c (or the first divided portion 14b) is from the opening side of the slot portion 15 (the side corresponding to the distal end side of the tooth portion 14) to the far side (the teeth portion). 14 (side corresponding to the base end side of 14) and gradually increasing in shape.

  Next, a method for manufacturing the stator 11 will be described with reference to FIG.

  First, as shown in FIG. 2A, a yoke portion 13 that extends substantially linearly, and a plurality of the yoke portions 13 provided in a comb shape (the same number as the teeth portions 14 of the stator core 12). The straight core 25 having the tooth portions 14 and the slot portions 15 formed between the adjacent tooth portions 14 is formed (first step). The teeth portion 14 of the straight core 25 extends in a direction substantially perpendicular to the longitudinal direction of the yoke portion. And as already explained, the notch part 14a cut | disconnected from the front-end | tip of the teeth part 14 toward the base end side is provided in the yoke part longitudinal direction center part of each teeth part 14. As shown in FIG. Further, the length of the yoke portion 13 in the teeth portion extending direction is set to a predetermined value or less, and the extending lengths of the plurality of teeth portions 14 are the same. The yoke portion 13, the teeth portion 14 and the slot portion 15 of the straight core 25 are the same as the yoke portion 13, the teeth portion 14 and the slot portion 15 when the straight core 25 is the stator core 12, respectively. 2, the same reference numerals as those of the stator core 12 are attached.

  After the formation of the straight core 25, as shown in FIG. 2B, the winding 21 is wound around the teeth portion 14 of the straight core 25 by distributed winding using a jig (not shown). It accommodates in the part 15 (2nd step). In other words, each winding 21 (coil) wound so as to straddle the three tooth portions 14 has a portion excluding the coil end portion 21a in the winding 21 having two slot portions 15 (of the three tooth portions 14). Of these, the tooth portions 14 located at both ends are positioned so as to be opposed to the two slot portions 15) located immediately on both sides, and then the winding 21 (coil) is moved to the slot portion 15 side to It inserts into the slot part 15 from the opening side. At this time, the winding 21 only needs to be moved straight in the extending direction of the tooth portion, and there is no need to expand the diameter of the winding 21 (coil). In addition, due to the shape of the slot portion 15, the spacing between the tooth portions 14 located at both ends of the three tooth portions 14 is smaller toward the base end side of the teeth portion 14, so that the winding 21 is further inserted. It becomes easy to do. It should be noted that all the windings 21 required in one straight core 25 are inserted into the slot portion 15 at substantially the same time by a jig, and thus all the windings 21 are accommodated in the slot portion 15 at substantially the same time (FIG. 2 (c)).

  Here, in FIG. 2B, in order to make the coil end portion 21a arranged outside the slot portion 15 (on both sides in the central axis direction of the stator core 12 with respect to the slot portion 15) in the winding 21 easy to understand. It is drawn schematically. Moreover, in FIG.2 (c) and (d), description of the coil end part 21a is abbreviate | omitted. Actually, the coil end portions 21a of all the windings 21 of the stator 11 cover and hide the surfaces on both sides in the central axis direction of the stator core 12 in all the tooth portions 14, but in FIG. The portion is omitted so that a part of the teeth portion 14 can be seen.

  In this embodiment, before the winding 21 is accommodated in the slot portion 15, the periphery of the winding 21 is covered with an insulating film made of insulating paper or polyethylene terephthalate (PET), and then the winding is performed as described above. The wire 21 is accommodated in the slot portion 15. Note that an insulating member may be set in the slot portion 15 and then the winding 21 may be accommodated in the slot portion 15.

  After the winding 21 is accommodated in the slot portion 15, as shown in FIG. 2D, the yoke portion 13 of the straight core 25 is placed on the inner peripheral side of the tooth portion 14 and The first divided portion 14b and the second divided portion 14c are bent into a substantially annular shape so as to be in close contact with each other (third step). Thus, the straight core 25 becomes the stator core 12. At this time, both end surfaces in the longitudinal direction of the yoke portion 13 are in close contact with each other, and the first divided portion 14b and the second divided portion 14c of each tooth portion 14 are in close contact with each other, so that there is no space in the notch portion 14a. Only the boundary line between the first dividing unit 14b and the second dividing unit 14c is visible. Further, due to the bending of the yoke portion 13, along with the shape of the slot portion 15, the winding 21 in the slot portion 15 tends to be pushed outward in the radial direction of the yoke portion 13 (back side of the slot portion 15). Therefore, it is difficult for the winding 21 to be detached from the slot portion 15. Note that both end surfaces in the longitudinal direction of the yoke portion 13 may be bonded to each other with an adhesive, but when the yoke portion 13 is press-fitted into the inner peripheral portion of the case portion 16 as in this embodiment, the bonding is It is not always necessary.

  After the yoke portion 13 is bent into a substantially annular shape, the yoke portion 13 is press-fitted into the inner peripheral portion of the case portion 16 and disposed on the inner peripheral side of the case portion 16 (fourth step). At the time of the press-fitting, the positioning key of the yoke portion 13 and the key groove of the case portion 16 are aligned, and the positioning key is slid with respect to the key groove to be fitted. By the press-fitting, the close contact state of both end surfaces of the yoke portion 13 in the longitudinal direction (that is, the yoke portion 13 is in a substantially annular shape) and the close contact state of the first and second divided portions 14b and 14c of each tooth portion 14 are obtained. Retained. Thus, the stator 11 of the permanent magnet motor M is completed.

  Therefore, in this embodiment, after the winding 21 is accommodated in the slot portion 15 of the straight core 25, the yoke portion 13 of the straight core 25 is bent in a substantially annular shape, so that the winding 21 is smoothly formed in the slot portion 15. And the packing density of the windings 21 of the distributed winding with respect to the slot portion 15 can be improved. Moreover, since the notch part 14a is provided in the teeth part 14, it becomes possible to bend the yoke part 13 easily so that it may become a predetermined diameter. On the other hand, even if such a cutout portion 14a is provided, the first divided portion 14b and the second divided portion 14c divided by the cutout portion 14a are in a state where the yoke portion 13 is bent in a substantially annular shape. Since they are in close contact with each other, there is no problem in the performance of the permanent magnet motor M.

  In the present embodiment, since the substantially cylindrical case portion 16 is disposed on the outer peripheral side of the yoke portion 13, the case portion 16 can easily and reliably hold the yoke portion in a substantially annular shape. In addition, since the case portion 16 is used as a back yoke, the yoke portion 13 can be easily bent by reducing the length of the yoke portion in the teeth portion extending direction, and the yoke portion in the teeth portion extending direction. It is possible to suppress a decrease in the performance of the permanent magnet motor M caused by reducing the length of the motor. Furthermore, by making the case portion 16 a water-cooled case portion, the heat generated by the winding 21 can be absorbed efficiently.

  Here, in order to more smoothly insert the winding 21 into the slot portion 15 of the straight core 25, the length of the opening of the slot portion 15 in the longitudinal direction of the yoke portion (the adjacent teeth in the opening). The distance between the first divided portion 14b (or the second divided portion 14c) of one of the tooth portions 14 and the second divided portion 14c (or the first divided portion 14b) of the other tooth portion 14) Is preferably as large as possible. In order to do this, it is preferable that the angle formed by the opposing side surfaces of the first and second divided portions 14b and 14c sandwiching the notch portion 14a is an acute angle (smaller).

  The present invention is not limited to the embodiment described above, and can be substituted without departing from the spirit of the claims.

  For example, in the above embodiment, when the stator 11 is manufactured by disposing the substantially cylindrical case portion 16 on the outer peripheral side of the yoke portion 13 of the stator core 12, the yoke portion 13 bent into a substantially annular shape is used as the case portion. The case portion 16 is not always necessary, and when the case portion 16 is not provided, the yoke portion 13 is disposed on the inner peripheral side of the case portion 16. Is no longer needed. However, it is necessary to bond both end surfaces of the yoke portion 13 in the longitudinal direction with an adhesive.

  Further, the case portion 16 may not be used as a back yoke, but may be a water-cooled case portion made of aluminum, for example, and may not have a water jacket.

  Further, in the above embodiment, the permanent magnet motor M is a vehicle driving motor for an electric vehicle or a hybrid vehicle. However, the present invention is not limited to this and can be used for other purposes.

  The above-described embodiments are merely examples, and the scope of the present invention should not be interpreted in a limited manner. The scope of the present invention is defined by the scope of the claims, and all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

  INDUSTRIAL APPLICABILITY The present invention is useful for a stator manufacturing method and a stator for a permanent magnet motor disposed on the outer peripheral side of a rotor core provided with a permanent magnet. In particular, the permanent magnet motor is used for an electric vehicle or a hybrid vehicle. This is useful when used as a drive motor.

M Permanent magnet motor 2 Rotor core 3 Permanent magnet 11 Stator 12 Stator core 13 Yoke part 14 Teeth part 14a Notch part 14b First division part 14c Second division part 15 Slot part 16 Case part 17 Water jacket 21 Winding 25 Straight core

Claims (4)

A method for manufacturing a stator of a permanent magnet motor, which is disposed on the outer peripheral side of a rotor core provided with a permanent magnet,
Each tooth portion includes a yoke portion extending substantially linearly, a plurality of teeth portions provided extending in a comb shape on the yoke portion, and a slot portion formed between the adjacent tooth portions. However, a straight core divided into a first divided portion on one side in the longitudinal direction of the yoke portion and a second divided portion on the other side by a notch portion cut from the distal end of the teeth portion toward the proximal end side. A first step of forming;
After the first step, a second step of accommodating the winding in the slot portion so as to be wound around the teeth portion of the straight core by distributed winding,
After the second step, the yoke portion of the straight core is formed in a substantially annular shape so that the teeth portion is located on the inner peripheral side and the first divided portion and the second divided portion of each tooth portion are in close contact with each other. And a third step of bending. A method of manufacturing a stator of a permanent magnet motor. In the manufacturing method of the stator of the permanent magnet type motor according to claim 1,
The stator of the permanent magnet motor further comprising a fourth step of disposing the substantially annularly bent yoke portion on the inner peripheral side of the substantially cylindrical case portion after the third step. Production method. In the manufacturing method of the stator of the permanent magnet type motor according to claim 2,
The method for manufacturing a stator of a permanent magnet motor, wherein the case part is a water-cooled case part having a water jacket. A stator of a permanent magnet type motor disposed on the outer peripheral side of a rotor core provided with a permanent magnet,
A yoke portion that is bent from a substantially linearly extending state and formed into a substantially annular shape;
A plurality of teeth portions provided on the inner peripheral surface of the yoke portion and extending inwardly in the yoke portion radial direction at intervals in the yoke portion circumferential direction;
A slot portion formed between the teeth portions adjacent to each other;
A winding housed in the slot portion so as to be wound by distributed winding on the teeth portion,
Each of the teeth portions is a first portion on one side in the longitudinal direction of the yoke portion by a notch portion cut from the distal end of the teeth portion toward the proximal end side before the yoke portion is bent into a substantially annular shape. Divided into one divided portion and a second divided portion on the other side,
The stator of the permanent magnet motor, wherein the first and second divided portions of each of the tooth portions are in close contact with each other in a state where the yoke portion is bent in a substantially annular shape.

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