JP2005238461A - Resin molding method of electromotor and mold used therein - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resin molding method for locating the iron core of a stator rapidly/certainly without using a special mold, in an electromotor constituted so that the iron core of the stator and the end part of a winding with a resin mold layer comprising a molding resin and capable of molding thinly and uniformly the resin mold layer even in the insertion hole of the rotor of the iron core of the stator. <P>SOLUTION: A regulation member 17 is formed to the mold 15 for housing the iron core 1 of the stator wherein the winding 10 is wound and the underside of the outer peripheral part of the iron core 1 of the stator is locked with and carried on the regulation member 17 so as to be impossible to laterally move while the central mold part 15c provided in the mold 15 is inserted in the insertion hole 5 of the rotor of the iron core 1 of the stator to form a narraw flooding gap between the central mold part 15c and the insertion hole 5 of the rotor. In this state, the molding resin is injected in the mold 15 to cover the peripheral surfaces of the iron core 1 of the stator, the winding 10 and the insertion hole 5 of the rotor of the iron core 1 of the stator. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a resin molding method for an electric motor and an improvement of a molding die used for the resin molding method.

  Conventionally, when a stator core around which a winding is wound is molded by a mold resin made of, for example, phenol or epoxy resin, generally, a lower molding die having a molding recess among a pair of upper and lower molding dies. The rotor core insertion hole of the stator core wound with the winding is fitted in the central mold part forming the cylinder of the cylinder, and the stator core is accommodated in the recess of the lower molding die, and then the lower side Cover the upper surface of the molding die with an upper molding die having a molding recess, and inject molding resin at a constant pressure using an injection molding machine or the like from the gate formed at the joint of the upper and lower molding dies. (Injection).

  The injected mold resin is sequentially divided into the upper, lower, left and right sides of the stator core while colliding with the outer peripheral surface of the stator core, and flows into the entire recesses of the upper and lower pair of molding dies. The winding is covered with a resin mold layer made of mold resin.

  However, the above molding method has the following problems. That is, the mold resin injected from the gate contacts the winding end portion (coil end portion) wound around the stator core. In this case, the winding end portion receives the injection pressure of the injected mold resin. For example, if the center mold part of the lower molding die (the center mold part is the same height as the stacking dimension of the stator core or slightly lower, the center of the upper molding die) There is a case to contact the mold part.

  In the state as described above, when the molding of the stator core around which the winding is wound is finished, a part of the winding end is exposed from the resin mold layer, and as a result, the winding end is molded. The resin cannot be completely covered, and there is a problem that it is impossible to take advantage of the characteristics of the improvement of the insulation performance and the reduction of magnetic noise, which are the characteristics unique to the mold motor.

  In order to solve the above-mentioned problem, for example, a band-shaped insulator is disposed on the inner peripheral surface of a winding wound around the stator core, and the position facing the band-shaped insulator (for example, the stator core core) There has also been proposed a method in which a gate is provided in the axial direction and a resin mold layer of a mold motor is provided by injecting (injecting) mold resin from the gate. In the resin molding method described above, the problem that the outer peripheral surface of the winding can be satisfactorily filled with the molding resin and the end of the winding is exposed from the resin molding layer has been solved. (For example, refer to Patent Document 1).

JP-A-61-66555

  However, the resin molding method has the following problems. That is, in the first molding, in order to prepare a band-shaped insulator to be arranged on the inner peripheral surface of the winding in advance, or to form a gate for injecting mold resin at a position facing the insulator, For example, since the flow path for the mold resin to flow out from the inside of the stator core to the outside direction must be formed in the central mold part of the upper and lower molding dies, the shape of the molding dies is complicated, This inevitably increases the manufacturing cost of the mold motor.

  Second, since a minute gap is formed between the rotor insertion hole of the stator core and the central mold portion of the lower molding die that is fitted into the rotor insertion hole, When the mold resin is injected, the stator core moves (eccentric) by the dimension of the gap due to the injection pressure. As a result, the fitting recess of the bearing housing formed in the resin mold layer after molding of the electric motor inevitably moves from the dimension position designed in advance, so the rotor is inserted into the rotor insertion hole of the stator core. When the bearing provided on the rotor shaft is inserted into the bearing housing, the gap dimension between the rotor and the rotor insertion hole of the stator core becomes non-uniform, resulting in poor rotation efficiency of the rotor. There is a problem of inducing generation factors of vibration and noise.

  In addition, even when mold resin enters the gap between the rotor and the rotor insertion hole, when the mold resin that has entered the gap is solidified to form a thin resin mold layer, the resin mold The thickness of the layer is non-uniform, and as a result, the rotational efficiency of the mold motor is reduced as described above. Furthermore, in the mold motor with a built-in circuit board, since the mold resin is injected from above the stator core toward the axial direction, when the circuit board is arranged above the stator core, the circuit board is When the mold resin is deformed or damaged by the injection (injection) pressure of the mold resin, there is a problem in that the defective rate of the mold motor increases, the manufacturing efficiency of the mold motor decreases, and the manufacturing cost increases.

  In view of the various problems described above, the present invention uses a special molding die in an electric motor in which a stator core and a winding end are reliably covered with a resin mold layer made of a mold resin. To provide a resin mold method and a molding die that can quickly and surely position the stator core and make the resin mold layer thin and uniform even in the rotor insertion hole of the stator core. Objective.

  According to the first aspect of the present invention, there is provided a stator core having a rotor insertion hole and a salient pole for winding a winding formed in the axial direction of the rotor insertion hole, and winding the winding of the stator core. A non-winding portion of the salient pole to be covered, and a blocking wall for preventing the winding from separating toward the rotor insertion hole and a support leg for mounting and locking the circuit board, respectively. Insulators integrally formed on the stator core, windings wound around the salient poles of the stator core, and this winding and the stator core are molded integrally with a mold resin. In the resin molding method for an electric motor, a restricting member is formed on a molding die that accommodates the stator core wound with the winding, and the lower side of the outer periphery of the stator core is engaged on the restricting member so as not to be laterally movable.・ Mounted and provided in the molding die in the rotor insertion hole of the stator core In a state where a narrow space is formed between the rotor insertion hole and the rotor insertion hole, a mold resin is injected into the molding die, and a stator core and windings and a stator core rotor The peripheral surface of the insertion hole is covered with a resin mold layer.

  According to a second aspect of the present invention, in the resin molding method for an electric motor according to the first aspect, the stator core is regulated so as not to be laterally moved by a regulating member, and a rotor insertion hole of the stator core and the rotor are inserted. A small diameter step portion for forming a narrow space between the central mold portion of the molding die to be inserted into the hole is formed in the central mold portion of the molding die, and the central mold portion and the rotor insertion hole A thin resin mold layer is formed in the gap formed between the two.

  According to a third aspect of the present invention, in the resin molding method for an electric motor according to the first aspect, the lower surface of the circuit board is received on the blocking wall facing the circuit board that is mounted on the insulator formed on the stator core. A receiving part is provided, and the circuit board is supported by the receiving part, and the stator core and the winding including the circuit board and the peripheral surface of the rotor insertion hole of the stator core are covered with the resin mold layer. It is characterized by.

  According to a fourth aspect of the present invention, there is provided a stator core having a rotor insertion hole and a salient pole for winding a winding formed in the axial direction of the rotor insertion hole, and winding the winding of the stator core. A non-winding portion of the salient pole to be covered, and a blocking wall for preventing the winding from separating toward the rotor insertion hole and a support leg for mounting and locking the circuit board, respectively. Insulators integrally formed on the stator core, windings wound around the salient poles of the stator core, and this winding and the stator core are molded integrally with a mold resin. In the resin molding method for an electric motor, the lower part of the outer periphery of the stator core is engaged and mounted in the housing recess of the molding die for housing the stator core wound with the winding, and moves in the lateral direction. A restricting member is provided to prevent the rotor from being inserted into the stator core. The central mold portion inserted into the rotor is provided with a small diameter step portion that uniformly forms a narrow space between the rotor insertion hole and the circumferential surface of the rotor insertion hole in the stator core. It is characterized by that.

  According to a fifth aspect of the present invention, in the molding die used in the resin molding method for an electric motor according to the fourth aspect, the regulating member that partially engages and mounts on the lower side of the outer peripheral portion of the stator core is a molding die. It is characterized in that it is formed so as to protrude from the bottom surface or peripheral surface of the housing recess.

  According to the first aspect of the present invention, the mold resin is formed from the gate to the molding die in a state where the stator core wound with the winding is engaged and mounted on the regulating member formed on the molding die so as not to move laterally. Since the entire area of the stator core and the winding is covered with a resin mold layer made of a mold resin, the resin mold layer is a meat that has the stator core and the entire area of the winding set in advance. It can be formed almost uniformly in the thickness dimension. This is possible because the stator core itself is engaged and mounted on a regulating member provided in the molding die so as not to move due to the injection pressure of the mold resin. As a result, at the time of molding of the electric motor, the stator iron core is held in the molding die so as not to swing without being slightly moved. As a result, the peripheral surface of the rotor insertion hole and the central mold part of the molding die As a result of maintaining a uniform gap between the two, a thin resin mold layer can be satisfactorily formed with a uniform thickness on the peripheral surface of the rotor insertion hole using the gap. .

  As described above, since the resin mold layer is formed by restricting the movement of the stator core when the molding is performed by the regulating member formed on the molding die, the bearing formed on the resin mold layer is fitted. In addition to the fact that the bearing housing can be formed at the designed position, the resin mold layer can be formed with a uniform thickness even in the rotor insertion hole into which the rotor is inserted. The electric motor characteristics can be improved satisfactorily.

  In the invention according to claim 2, since the stator core around which the winding is wound is held non-oscillating by the regulating member provided in the molding die at the time of molding the electric motor, the rotation of the stator core The gap between the rotor insertion hole and the small diameter portion formed in the central mold portion of the molding die can be held at the same size at any position of the rotor insertion hole. As a result, the rotor insertion hole Since the resin mold layer with a predetermined thickness can be smoothly molded on the peripheral surface of the rotor, the rotor can be rotated efficiently, and moisture should enter the rotor insertion hole of the stator core. Even in this case, since the rotor insertion hole is covered with the resin mold layer, rusting can be prevented well. In addition, even when used in a low-temperature location (for example, in a refrigerator or freezer), moisture penetrates into the resin mold layer by capillary action from between the laminated stator cores, and the resin mold layer is damaged when frozen. This problem can be solved with certainty. That is, this type of molded electric motor can be used smoothly over a long period of time, which is convenient.

  In the invention described in claim 3, the circuit board placed and locked on the insulator is mounted on the insulator in a state of being mounted and held on a receiving portion provided on the top of the blocking wall formed on the insulator. As a result, the circuit board itself is pressed toward the tip end side of the winding by the mold resin injected into the molding die at the time of molding, causing distortion and damaging the circuit pattern (printed wiring) formed on the circuit board. The problem that the part connected to the lead wire from the winding on the circuit board is disconnected can be avoided well, so that the circuit board is damaged during molding. The problem that the mold motor becomes unusable and the defect rate becomes high can be effectively reduced.

  In the invention according to claim 4, the stator core around which the winding is wound is held by the regulating member formed in the molding die, so that the problem of swinging of the stator core is solved and the molding operation is performed. Since the resin mold layer can be formed with a substantially uniform thickness within the range of a predetermined design value on the inner and outer peripheral surfaces of the stator core, including the end of the winding. The assembly work of the mold motor after molding can be simplified because the resin mold layer is formed within the range of the design value, and the mold motor can be quickly and satisfactorily reduced without deteriorating the characteristics of the mold motor. It can be manufactured and is convenient.

  In a fifth aspect of the invention, the restricting member that holds the stator core wound with the winding in a molding die so as not to swing is formed metal according to the size of the stator core. By forming a predetermined number in the mold, the stator core can be quickly and reliably supported in the molding die, so that the molding position of the bearing housing for fitting the bearing or the rotation for inserting the rotor Since the thickness of the resin mold layer formed in the child insertion hole can be set to an arbitrary thickness, it is possible to manufacture the mold motor so as to maintain the same performance as that of a normal motor. It also has the advantage that the seed mold motor can be manufactured quickly, easily and economically.

  Embodiments of the present invention will be described below with reference to FIGS. First, in FIG. 1, reference numeral 1 denotes a stator core of a molded motor, and the stator core 1 is formed around the inner periphery of an annular laminated core 2 whose outer periphery is circular as shown in FIGS. For example, six salient poles 4 project from the slot 3 with a predetermined interval therebetween.

  As shown in FIG. 2, the salient pole 4 includes a projecting portion 4a for forming a rotor insertion hole 5 projecting from a yoke portion of the laminated core 2 to a central portion in the radial direction, and a tip of the projecting portion 4a. A rotor 6 (see FIG. 1) is provided with a magnetic pole portion 4c having a pair of extension portions 4b extending at a constant dimension on both sides in the circumferential direction, and the magnetic pole surface of the magnetic pole portion 4c is inserted into the rotor insertion hole 5 ) In an arc shape so as to correspond to the outer peripheral surface.

  7 is a mold forming process using an insulating member made of synthetic resin for the entire region of the stator core 1 except for the magnetic pole surface side of the salient pole 4 of the stator core 1 and the annular outer peripheral surface side of the stator core 1 (that is, 3 shows an insulator formed by covering the inner peripheral surface of the slot 3 and the end surfaces of the salient poles 4 located on both sides in the stacking direction. The insulator 7 is further stacked as shown in FIG. A support leg 9 for mounting and locking the circuit board 8 on the stator core 1 (see FIG. 1) for each part where the base end of the salient pole 4 on the yoke part side of the iron core 2 exists, and the support leg 9, the end (coil end) of the winding 10 wound around the salient pole 4 is tilted (detached) toward the rotor insertion hole 5 at the tip of the salient pole 4 (on the rotor insertion hole 5 side) opposite to 9. Arc-shaped blocking walls 11 that receive the It has been set.

  When the insulator 7 is formed on the stator core 1 as described above, in the non-winding portion of the slot 3 (the protruding portion 4a of the salient pole 4) covered by the insulator 7 of each salient pole 4 of the laminated core 2, the insulator 7 is illustrated. The winding 10 is formed by winding a winding conductor that is not to be wound. When winding the winding 10, for example, a nozzle of a winding machine (not shown) is inserted into each slot 3 located on both sides of the salient pole 4 to directly connect the winding conductor to the non-winding portion of the salient pole 4. That is, the winding 10 is configured by winding the protrusion 4a a predetermined number of times.

  When the winding operation of the winding conductor is completed, a winding (not shown) made of a plate-like insulating member is wound around the salient pole 4 inside the opening 3a of the slot 3 (in the slot 3). The opening 3a is closed by inserting 10 into the slot 3 so as to be slightly compressed. As a result, the winding 10 is prevented from projecting from the slot 3 into the rotor insertion hole 5 through the opening 3a.

  Next, a molding die 15 for molding the stator core 1 around which the winding 10 is wound will be described. As shown in FIG. 4, the molding die 15 is composed of a lower molding die 15a serving as a fixed mold and an upper molding die 15b serving as a movable mold.

  As shown in FIG. 4, the lower molding die 15a is formed with an accommodation recess 16 for accommodating most of the stator core 1 and the winding 10 to form a resin mold layer 35 (see FIG. 1). In addition, when the stator core 1 is accommodated on the periphery of the bottom of the accommodating recess 16 away from the center of the lower molding die 15a, the stator core is engaged and mounted on the lower edge of the outer peripheral portion. A plurality of restricting members 17 for restricting the movement of 1 in the accommodating recess 16 in the lateral direction (front-rear and left-right directions) are provided in a vertical direction at a predetermined interval. The restricting member 17 may be formed by projecting a plurality of projecting pieces in the horizontal direction toward the central direction on the inner peripheral surface of the housing recess 16 as necessary.

  Further, a central mold part 15c formed in a columnar shape is provided at the center of the bottom of the lower molding die 15a so as to protrude upward. As shown in FIG. A very small gap (for example, 0.1 to 0.5 mm) for forming a thin resin mold layer 35a is formed between the rotor insertion hole 5 of the stator core 1 and a substantially central portion in the axial direction. A small diameter step portion 18 for forming the bearing housing 30 in the resin mold layer 35 shown in FIG. 1 is formed at the protruding end of the small diameter step portion 18. Is formed.

  Further, at the protruding base portion of the central mold portion 15c, after the rotor 6 is inserted into the rotor insertion hole 5 of the stator core 1, one of the rotor insertion holes 5 (lower part in FIG. 1) is closed. Large diameter step portions 22 for forming the engagement recesses 20 for engaging and holding the flat mounting flange portions 32 are formed integrally with the central mold portion 15c, respectively.

  Next, the upper molding die 15b of the molding die 15 will be described. The upper molding die 15b is in contact with the housing recess 21 and the top of the central mold portion 15c of the lower molding die 15a at a position corresponding to the housing recess 16 of the lower molding die 15a, as shown in FIG. An annular projection 22a for forming a projection hole 33 for projecting the rotor shaft 6a of the rotor 6 to the outside from the mold layer 35 is integrally formed.

  When the upper molding die 15b is put on the upper surface of the lower molding die 15a, one of the molding dies 15 (the right side in FIG. 4) has a gate 23 communicating with the housing recesses 16 and 21. A lead wire 34 shown in FIG. 1 and a common hole 24 for penetrating and projecting an insulating member (for example, rubber bush) 34a inserted through the lead wire 34 are formed on the other side opposite to the gate 23, respectively. .

  Next, the case where the stator core 1 around which the windings 10 are wound is molded. A winding conductor (not shown) is wound around each of the salient poles 4 via the insulator 7 on the stator core 1 to form a winding 10, and then a circuit board 8 with printed wiring is attached to the support leg 9 of the insulator 7. . When mounting the circuit board 8, for example, a lead wire (not shown) previously derived from the winding 10 is connected to a predetermined position of the circuit board 8, and a lead wire for energization from the circuit board 8 is used. After pulling out 34, the circuit board 8 is attached to the support leg 9.

  When the circuit board 8 is attached to the support leg 9, as shown in FIG. 3, the circuit board 8 is placed on the support leg 9 and cannot be swung by the locking claw 9a provided on the upper part of the support leg 9. Lock. When the circuit board 8 is locked to the locking claw 9 a of the support leg 9, as shown in FIG. 3, the receiving portions 11 a formed on the top of the arc-shaped blocking wall 11 of the insulator 7 are respectively provided on the lower surface of the circuit board 8. The circuit board 8 itself is brought into contact with the receiving part 11a and is engaged with the receiving portion 11a and the engaging claw 9a of the supporting leg 9, so that the circuit board 8 can be attached to the supporting leg 9 while maintaining the horizontal state. It should be noted that the lead wires and lead wires 34 derived from the windings 10 may be connected to the circuit board 8 after the circuit board 8 is attached to the support legs 9.

  Subsequently, the case where the winding 10 is wound as described above and the stator core 1 having the circuit board 8 attached to the insulator 7 is molded will be described. In the state where the upper mold 15b of the mold 1 is removed from the lower mold 15a and the receiving recess 16 is opened to the outside, the stator core 1 around which the winding 10 is wound is inserted into the rotor insertion hole. 5 with the central mold portion 15c of the lower molding die 15a being inserted into the receiving recess 16 of the lower molding die 15a, as shown in FIG. The peripheral edge is engaged and mounted on a regulating member 17 erected on the peripheral edge of the bottom of the housing recess 16.

  As shown in FIG. 4, the upper part of the restricting member 17 is formed with an engaging step portion 17a for engaging and holding the lower peripheral edge of the stator core 1, so that the rotor core 1 mounted on the restricting member 17 is mounted. Can be smoothly and satisfactorily mounted and accommodated without being locked to the engaging step portion 17a and swinging in the lateral direction. When the stator core 1 is accommodated in the lower molding die 15a, the upper molding die 15b is placed on the upper surface of the lower molding die 15a as shown in FIG.

  When the upper molding die 15b is put on the upper surface of the lower molding die 15a, the upper molding die 15b is covered with the annular protrusion 22a in contact with the small-diameter ring body 19 of the central mold portion 15c. In addition, the stator core 1, the winding 10, the circuit board 8 and the like are accommodated, and a molding resin (synthetic resin) is injection-molded into the spaces of the accommodating recesses 21 and 16 of the lower molding dies 15b and 15a. The resin mold layers 35 and 35a are formed.

  In this way, the stator core 1 around which the winding 10 is wound is accommodated in the molding die 15, and from the injection molding machine 36 via the gate 23 formed by the upper and lower molding dies 15b, 15a, for example, Then, phenol, epoxy, nylon, or the like as a mold resin is injected and injected into the housing recesses 16 and 21 at a constant pressure. The mold resin injected into the housing recesses 16 and 21 through the gate 23 is branched vertically and horizontally in the housing recesses 16 and 21 so that the stator core 1 of the winding 10 corresponding to the gate 23 is formed. Resin mold layers 35 and 35a for molding the stator core 1, the winding 10, and the circuit board 8 are formed as shown in FIG. Is.

  When the mold resin is molded, the stator core 1 including the windings 10 accommodated in the upper and lower accommodating recesses 16 and 21 through the gate 23 is shaken by the injection pressure of the mold resin. As described above, the stator core 1 itself is engaged and mounted on the restriction member 17 provided in the housing recess 16 so as not to swing, so that the resin mold layers 35 and 35a are formed. In this case, the bearing housing 30 is displaced, or the gap space between the rotor insertion hole 5 of the stator core 1 and the central mold portion 15c of the lower molding die 15a is not uniform depending on the location. In addition, the bearing housing 30 can be reliably formed at a position of a predetermined design dimension.

  Also, in the resin mold layer 35a formed on the peripheral surface of the rotor insertion hole 5, the thickness (for example, the rotor 6 can be efficiently rotated without causing trouble in the rotation of the rotor 6 (for example, , 0.1 to 0.5 mm), the molded layer 35a can be formed satisfactorily, so this type of electric motor can be rotated efficiently and smoothly without causing rusting on the stator core 1. Can be manufactured.

  Further, when molding resin is injected into the housing recesses 16 and 21 of the upper and lower molding dies 15b and 15a during the molding, the circuit board 8 locked to the insulator 7 is caused by the injection pressure of the molding resin. If the stator core 1 is pressed toward the rotor insertion hole 5 and is distorted, there is a problem in that the printed wiring becomes inconvenient and the function of the circuit board 8 is impaired.

  However, in the present invention, as shown in FIG. 3, the outer peripheral edge of the circuit board 8 is locked to the support leg 9, and the inner peripheral edge is always attached to the receiving portion 11 a provided on the top of the blocking wall 11 of the insulator 7. Since it is supported and held, the problem of distortion caused by the injection pressure of the molding resin can be surely prevented by the presence of the support leg 9 and the receiving portion 11a. It is possible to reliably solve the problem that the mold motor 25 that has caused inconvenience cannot be used.

  As described above, when the operation of forming the resin mold layers 35 and 35a on the stator core 1 around which the winding 10 is wound is completed, as shown in FIG. 7, the mold motor 25 including the resin mold layers 35 and 35a is provided. The stator 1a in which the resin mold layers 35 and 35a are formed is formed. As shown in FIG. 7, in the stator 1 a, a portion where the restricting member 17 on which the stator core 1 of the molding die 15 is mounted is formed by a resin mold layer 35 due to the presence of the restricting member 17. The hole a remains. As shown in FIG. 8, the holes a are formed by filling the same kind of resin as the mold resin after forming the stator 1a as necessary, so as to eliminate the holes a shown in FIG. Also good.

  When the stator 1a is formed, as shown in FIG. 1, the rotor 6 having bearings 6b1 and 6b2 attached to the rotor shaft 6a is inserted into the rotor insertion hole 5 of the stator core 1, and the rotor shaft 6a. One of the bearings 6b1 attached to is inserted into the bearing housing 30 on the resin mold layer 35 side, and the other bearing 6b2 is inserted into the bearing housing 31a of the metal bracket 31 that closes the rotor insertion hole 5, for example. That is, as shown in FIG. 1, the bracket 31 is fitted into the rotor insertion hole 5 from the lower side of the stator 1a, as shown in FIG. With the bearing 6b2 fitted into the bearing housing 31a below the resin mold layer 35, the bearing 6b2 is attached to the engagement recess 20 of the resin mold layer 35, and the assembly operation of the mold motor 25 is completed. Thereafter, if necessary, the bracket 31 is fixed to the stator 1a by screwing a mounting bolt into an insert fitting (not shown) in which the bracket 31 is inserted into the resin mold layer 35, or the bracket 31 itself is fixed to the rotor. The engaging protrusion 32a may be press-fitted into the insertion hole 5 so as to be installed on the stator 1a without using a fastening bolt.

  In the present invention, as described above, when the resin mold layers 35 and 35a are formed on the stator core 1 around which the winding 10 is wound, the stator core 1 itself is used as the regulating member 17 in the molding die 15. Since the resin mold layers 35 and 35a are formed by being engaged and mounted so as not to swing, the bearings 6b1 and 6b2 are accommodated when the mold motor 25 is assembled using the stator 1a after molding. The bearing housings 30 and 31a can be molded according to design values, that is, within a range of dimension values set in advance, without causing the resin core layers 35 and 35a to swing the stator core 1, respectively. Since the mold motor 25 can be manufactured efficiently and reliably with no problems caused by vibration, noise, rusting, and freezing at low temperatures, this type of mold motor 25 has improved characteristics and is economical. It can be produced. In addition, since the regulating member 17 that prevents the stator core 1 from swinging is formed integrally with the molding die 15 and is simply formed on the molding die 15 used at the time of molding, the molding operation is There is also an advantage that it can be performed quickly and easily without requiring any special member.

It is a longitudinal cross-sectional view of the mold motor manufactured by the method of this invention. It is a top view of the stator iron core used for a mold motor. It is sectional drawing in the AA of FIG. It is a longitudinal cross-sectional view of the molding die used for the resin mold method of this invention. It is a longitudinal cross-sectional view which shows the state which accommodated the stator core which comprised the coil | winding in the shaping die. It is a longitudinal cross-sectional view which shows the resin mold state of a stator core. It is sectional drawing which shows the stator of the semi-finished product state in which the resin mold layer was formed. It is a longitudinal cross-sectional view of a stator

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stator iron core 1a Stator 4 Salient pole 5 Rotor insertion hole 6 Rotor 7 Insulator 8 Circuit board 9 Support leg 10 Winding 11 Blocking wall 15 Molding die 15a Lower molding die 15b Upper molding die 15c Central die Part 16 Housing recess 17 Restricting member 20 Engaging recess 21 Housing recess 25 Mold electric motor 35, 35a Resin mold layer

Claims (5)

  A stator core having a rotor insertion hole and a salient pole for winding a winding formed in the axial direction of the rotor insertion hole, and a non-winding portion of the salient pole for winding the winding of the stator core And a supporting wall for mounting and locking the circuit board and preventing the winding from separating to the rotor insertion hole side, and a supporting leg for mounting and locking the circuit board, respectively. In the resin molding method for an electric motor in which the insulator formed on the winding, the winding wound around the salient pole of the stator core, and the winding and the stator core are integrally molded with a molding resin, A regulating member is formed on a molding die that houses the stator core around which the winding is wound, and the lower side of the outer periphery of the stator core is engaged and mounted on the regulating member so as not to move laterally. Inserting a central mold portion provided in the molding die into the rotor insertion hole of the stator core, the rotor In a state where a narrow gap is formed between the insertion hole and the molding resin, the mold resin is injected into the mold, and the stator core, the winding and the peripheral surface of the rotor insertion hole of the stator core are resin-molded. A resin molding method for an electric motor, characterized by being covered with a layer.   The stator core accommodated in the molding die is regulated by a regulating member so as not to be laterally movable, and a rotor insertion hole of the stator core and a central die portion of the molding die inserted into the rotor insertion hole A small-diameter step for forming a narrow space between them is formed in the central mold portion of the molding die, and the resin mold layer is thin in the space formed between the central mold portion and the rotor insertion hole. The resin molding method for an electric motor according to claim 1, wherein:   The blocking wall facing the circuit board mounted on the insulator formed on the stator core is provided with a receiving portion for receiving the lower surface of the circuit board, and the stator core is supported by the receiving portion. 2. The resin molding method for an electric motor according to claim 1, wherein the winding including the circuit board and the peripheral surface of the rotor insertion hole of the stator core are covered with a resin molding layer.   A stator core having a rotor insertion hole and a salient pole for winding a winding formed in the axial direction of the rotor insertion hole, and a non-winding portion of the salient pole for winding the winding of the stator core And a supporting wall for mounting and locking the circuit board and preventing the winding from separating to the rotor insertion hole side, and a supporting leg for mounting and locking the circuit board, respectively. In the resin molding method for an electric motor in which the insulator formed on the winding, the winding wound around the salient pole of the stator core, and the winding and the stator core are integrally molded with a molding resin, The housing recess of the molding die that houses the stator core around which the winding is wound is provided with a regulating member that prevents the lower side of the outer periphery of the stator core from engaging and riding and moving laterally. The central mold part formed in the molding die and inserted into the rotor insertion hole of the stator core Is an electric motor characterized by comprising a small diameter step portion that uniformly forms a narrow gap between the stator core and the peripheral surface of the rotor insertion hole in the entire peripheral surface of the rotor insertion hole. Mold used for resin molding.   The restriction member that partially engages and mounts on the lower side of the outer peripheral portion of the stator core is formed so as to protrude from the bottom surface or the peripheral surface of the housing recess of the molding die. 4. A molding die used in the resin molding method for an electric motor according to 4.

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