Resin molded motor, stator unit, and method for manufacturing stator unit

Abstract

To provide a resin molded motor in which lead wires are directly exposed from a surface intersecting the axis of the resin molded motor without using a fastener, a resin molded stator unit, and a method for manufacturing the stator unit.SOLUTION: A manufacturing method of a stator unit 1 includes a component arrangement step of combining and arranging a substrate 2 having lead wires 3 connected to its ends, a temporary fixing device for temporarily fixing the lead wires with a curved portion formed in one part, and the lead wires, etc., into a first mold, a mold clamping step of clamping the mold, a molding step of injecting resin into the mold and hardening it to form a resin molded portion, and a temporary fixing device removal step of removing the temporary fixing device from the lead wires, and the temporary fixing device includes a first temporary fixing device and a second temporary fixing device, and in the mold clamping step, when the first mold and the second mold are clamped, the first pressing surface of the second mold presses the first pressed surface of the second temporary fixing device toward a temporary fixing device holding portion of the first mold.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a resin-molded motor, a stator unit in which a stator is resin-molded, and a method for manufacturing a stator unit. [Background technology]

[0002] Resin-molded motors use a stator molded in resin. The stator of a resin-molded motor is provided with a connection part for connecting to a power source, and as the connection part with the power source, a structure in which a lead wire is drawn out to the outside and connected to the power source, or a connector structure is generally used. In the case of a structure in which a lead wire is drawn out to the outside, as in Patent Document 1 and Patent Document 2, a bushing, which is a fixture for fixing the lead wire, is embedded in the part where the lead wire is drawn out from the resin mold to the outside. The lead wire is drawn out to the outside through this fixture. In the resin-molded motor of the prior art, the fixture is provided on the side of the resin-molded part surrounding the axis of the resin-molded motor, and the lead wire is drawn out in a direction perpendicular to the axis of the resin-molded motor. In the case of a connector structure, as in Patent Document 3, a connector to which a lead wire is connected is provided on the side of the resin-molded part surrounding the axis of the resin-molded motor. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-7368 A [Patent Document 2] JP 2018-174608 A [Patent Document 3] JP 2004-104868 A Summary of the Invention [Problem to be solved by the invention]

[0004] As shown in Patent Documents 1 to 3, the fixing device or connector in the resin-molded stator of the prior art is provided on the side of the resin-molded part surrounding the axis of the resin-molded motor. However, there is no known motor in which a fixing device or connector is provided on the end face of the resin-molded part intersecting the axis of the resin-molded motor. This is related to the clamping of the mold when the stator is resin-molded. In the manufacturing method of the resin-molded stator, in order to prevent the resin injected into the mold from leaking out between the fixing device or connector and the mold, or between the fixing device and the lead wire, it is necessary to press the fixing device or connector while sandwiched between two molds when clamping the mold, and to make the mold and the fixing device or connector adhere closely to each other. In particular, when using a fixing device, the fixing device is divided into two parts, and the lead wire is sandwiched between the two divided fixing devices, so that in order to sufficiently adhere the two fixing devices to each other and the two fixing devices to the lead wire, it is necessary to clamp and press the two fixing devices between two molds when clamping the mold.

[0005] When clamping the mold for resin-molding the stator, the clamping force is applied in a direction parallel to the axis of the resin-molded motor, so that the force also acts in the direction along the side of the mold where the fixture or connector is arranged. For example, as shown in Fig. 1, the fixture 60a attached to the lead wire 30a is arranged on the side of the resin-molded part, and the fixture 60a is sandwiched between the first and second dies 70a and 70b, and the clamping force is used to press the fixture 60a. In Fig. 1, the clamping force acts in the vertical direction (parallel to the axis N of the resin-molded motor), that is, in the direction in which the fixture 60a is pressed by the first and second dies 70a and 70b. In this way, in the conventional technology, the clamping force is used to press the fixing device 60a with the first mold 70a and the second mold 70b, thereby eliminating gaps between the fixing device 60a and the first mold 70a, between the fixing device 60a and the second mold 70b, and between the fixing device 60a and the lead wire 30a, and preventing the resin injected into the internal space formed by the first mold 70a and the second mold 70b from leaking out to the outside.

[0006] In some cases, it may be preferable to draw the lead wires from a surface intersecting the axis of the resin molded motor, rather than drawing them from the side of the resin molded part, due to the space required to mount the resin molded motor. When drawing the lead wires from a surface intersecting the axis, it was necessary to sandwich a fixture or connector between two dies in a direction intersecting the axis of the resin molded part in order to prevent leakage of the resin injected into the mold. However, during resin molding, it is necessary to fix the stator of the resin molded motor to the mold. For example, in the case of a resin molded motor having a back casing, a part of the flange of the back casing must be sandwiched and fixed between two dies, and the central cylindrical part of the stator must be fitted into the back casing to fix the stator, so the clamping direction when clamping the mold cannot be a direction intersecting the axis of the resin molded motor. Therefore, when drawing out lead wires from a surface that intersects with the axis of a resin-molded motor, rather than sandwiching the fixture or connector between two dies, a hole is made in one die and the fixture or connector is inserted and secured in place through the hole.

[0007] For example, as shown in FIG. 2, assuming that the lead wire 30b is drawn out from a surface intersecting the axis N of the resin molded motor using the fixture 60b, a hole 79 is provided in the second mold 70d, and the fixture 60b is attached to the hole 79 of the second mold 70d before the mold is closed. At this time, the lead wire 30b is held by the fixture 60b. After that, when the second mold 70d is stroked several tens of centimeters during the mold closing, the lead wire 30b is drawn out to the outside of the second mold 70d in accordance with the stroke. Therefore, the lead wire 30b held by the fixture 60b before the mold closing needs to be elongated in accordance with the stroke amount of the second mold 70d. In other words, the lead wire 30b needs to have a length that is the actually required length plus the stroke amount of the second mold 70d, and therefore needs to have an extra length beyond what is actually used. In addition, since the lead wire 30b is pulled out from the fixture 60b to the outside of the second mold 70d in accordance with the stroke of the second mold 70d, a space is required to allow the pulled out excess lead wire 30b to escape, and further, a problem occurs as to whether the fixture 60b and the lead wire 30b can slide stably in accordance with the stroke of the second mold 70d. A method of fixing the fixture 60b to the stator instead of the second mold 70d and inserting the fixture 60b into the hole 79 of the second mold 70d when the mold is closed can be considered, but even in this case, the lead wire 30b needs to be pulled out to the outside from the hole 79 of the second mold 70d, and the lead wire 30b needs to have an extra length, and there is a problem as to whether the fixture 60b can be smoothly inserted into the hole 79. Even if the mold can be closed in this way, the fixture 60b is only inserted into the hole 79 of the second mold 70d, and the fixture 60b is not pressed by the first mold 70c and the second mold 70d. 2, the clamping force does not act as a force to press the fixture 60b through the first mold 70c and the second mold 70d. Therefore, the fixture 60b and the second mold 70d are not sufficiently adhered to each other, and the fixture 60b and the lead wire 30b are not sufficiently adhered to each other. As a result, when resin is injected into the internal space formed by the first mold 70c and the second mold 70d, the injected resin leaks out from between the fixture 60b and the second mold 70d and between the fixture 60b and the lead wire 30b.In this way, the lead wires need to be longer than necessary to match the stroke of the mold when it is closed. Furthermore, there is a problem associated with the stroke of the mold when it is closed, that is, whether the lead wires and fixing device can slide stably in accordance with the stroke of the mold. Furthermore, there is the problem of resin leakage during resin molding. For these reasons, resin molded motors having a structure in which the lead wires are pulled out from a plane that intersects with the axis of the resin molded motor have not been manufactured until now.

[0008] The present invention aims to provide a resin-molded motor in which lead wires can be directly exposed from a plane that intersects with the axis of the resin-molded motor without using fasteners, a stator unit in which the stator is resin-molded, and a method for manufacturing the stator unit. [Means for solving the problem]

[0009] A manufacturing method for a stator unit of a resin-molded motor according to a first aspect of the present invention includes a member arrangement process of arranging a stator core, an electromagnetic coil, a substrate, a lead wire having an end connected to the substrate, and a temporary fixing device for temporarily fixing the lead wire with a curved portion formed in a first mold; a mold clamping process of clamping the first mold and a second mold together; a molding process of injecting resin into an internal space formed by the clamped first mold, the second mold, and the end faces of the temporary fixing device and hardening the injected resin to form a resin molded portion; and a temporary fixing device removal process of opening the first mold and the second mold after molding the resin molded portion, and removing the temporary fixing device from the lead wire. The temporary fixing device includes a first temporary fixing device and a second temporary fixing device which are combined with each other, the lead wire is inserted between the first temporary fixing device and the second temporary fixing device, the first temporary fixing device is held by a portion extending in the clamping direction of the first mold (hereinafter, this portion is referred to as the "temporary fixing device holding portion"), the second temporary fixing device has a pressed surface which is pressed against the second mold, and a groove into which the lead wire is fitted is formed in the first temporary fixing device and / or the second temporary fixing device along the mating surfaces of the first temporary fixing device and the second temporary fixing device. During the mold clamping process and the molding process, the temporary fixture has an internal space side portion disposed between the temporary fixture holding portion of the first mold and the second mold in the radial direction of the stator unit on the internal space side, and an external space side portion disposed between the temporary fixture holding portion of the first mold and the second mold in the mold clamping direction on the external side of the first mold and the second mold, the pressed surface formed on the second temporary fixture has a first pressed surface formed on the internal space side and a second pressed surface formed on the external space side, the first pressed surface is inclined in a direction away from the temporary fixture holding portion toward the direction in which the second mold moves during mold clamping, and a surface of the second mold that presses the first pressed surface (hereinafter referred to as the "first pressing surface") is also inclined in a direction away from the temporary fixture holding portion toward the direction in which the second mold moves during mold clamping.In the mold clamping process, when the first mold and the second mold are clamped, the first pressing surface of the second mold is configured to press the first pressed surface of the second temporary fixing device toward the temporary fixing device holding portion of the first mold.

[0010] According to the manufacturing method of the stator unit having such a configuration, since the resin is prevented from leaking out from between the temporary fixing tool and the first and second dies in the molding process, the lead wires can be pulled out from the surface of the resin molded part that intersects with the axis of the resin molded motor. Furthermore, since the temporary fixing tool is used as a jig and is removed after resin molding, the lead wires can be pulled out directly from the resin molded part without using a fixing tool as in the past.

[0011] In a manufacturing method of a stator unit according to a second aspect of the present invention, one side of the curved portion of the lead wire extends toward the substrate, and the other side of the curved portion of the lead wire extends toward the space outside the first mold and the second mold (hereinafter referred to as the "external space"). The mating surfaces of the first temporary fixing tool and the second temporary fixing tool include an external space side mating surface formed on the external space side of the temporary fixing tool and an internal space side mating surface formed on the internal space side of the temporary fixing tool. In the mold clamping process, when the first mold and the second mold are clamped, the internal space side mating surface of the first temporary fixing tool and the internal space side mating surface of the second temporary fixing tool are pressed against each other by the temporary fixing tool holding portion and the first pressing surface, and one side of the curved portion of the lead wire is in close contact with both the first temporary fixing tool and the second temporary fixing tool.

[0012] According to the manufacturing method of the stator unit having the above-mentioned configuration, it is possible to prevent the resin from leaking out from between the temporary fixing tool and the lead wire during the molding process.

[0013] In a manufacturing method of a stator unit according to a third aspect of the present invention, a recess is formed in a portion of the first temporary fixing tool facing the temporary fixing tool holding portion, and the temporary fixing tool holding portion is inserted into the recess in the mold clamping direction to hold the first temporary fixing tool so as not to move in the radial direction of the stator unit.

[0014] In a manufacturing method of a stator unit according to a fourth aspect of the present invention, in the component arrangement process, the stator core and the electromagnetic coil are arranged on the outer periphery of a cylindrical back casing whose end adjacent to the substrate is closed, and the stator core, the electromagnetic coil, the substrate, the temporary fixing device, the lead wires, and the back casing are arranged in the first mold.

[0015] In a stator unit, which is a resin-molded stator used in a resin-molded motor according to the fifth aspect of the present invention, a stator core, an electromagnetic coil, a substrate, and lead wires connected to the substrate are molded by a resin molded part, and the lead wires are directly extended to the outside from a surface of the resin molded part that intersects with the axis of the resin molded motor.

[0016] With a stator unit of this configuration, by extending the lead wires directly to the outside from the surface that intersects with the axis of the resin-molded motor, it is possible to easily accommodate resin-molded motors that have limited radial space relative to the axis.

[0017] A stator unit according to a sixth aspect of the present invention comprises a cylindrical back casing whose end adjacent to the substrate is closed, and the stator core and the electromagnetic coil are arranged on the outer periphery of the back casing.

[0018] According to a stator unit having such a configuration, the back casing ensures that the stator unit is watertight, and therefore the stator unit can be used as a motor portion of a canned motor pump.

[0019] A resin-molded motor having a resin-molded stator unit according to a seventh aspect of the present invention has a rotor, the stator unit arranged to surround the rotor, and a shaft to which the rotor is fixed, and the stator unit is a stator unit according to the fourth or fifth aspect.

[0020] In a resin-molded motor having such a configuration, the lead wires do not protrude from the stator unit in a direction perpendicular to the axis of the resin-molded motor, so that the radial space relative to the axis of the resin-molded motor can be reduced, making it possible to realize a slim resin-molded motor. Effect of the Invention

[0021] According to the present invention, it is possible to provide a resin-molded motor in which lead wires can be directly extended from a plane that intersects with the axis of the resin-molded motor without using fixing devices, a stator unit in which the stator is resin-molded, and a method for manufacturing the stator unit. [Brief description of the drawings]

[0022] [Figure 1] FIG. 1 is a cross-sectional view of a state in which a first mold and a second mold are clamped together using a fixing device according to the prior art. [Diagram 2] 1 is a cross-sectional view of a mold in a clamped state, assuming that a lead wire is drawn out using a fixture from a surface that intersects with the axis of a resin-molded motor. [Diagram 3] FIG. 2 is a cross-sectional view of a stator unit. [Figure 4] FIG. 1(a) is a perspective view from above of a temporary fixing device, FIG. 1(b) is a perspective view from below of the temporary fixing device, and FIG. 1(c) is a perspective view from above of a first temporary fixing device and a perspective view from below of a second temporary fixing device in a state in which the temporary fixing device is separated. [Diagram 5] FIG. 4 is a cross-sectional view showing a state in which a first temporary fixture, a second temporary fixture, and a stator are arranged in a first mold. [Figure 6] FIG. [Figure 7] FIG. 2 is a side view of the molds in a state in which the first mold and the second mold are clamped together. [Figure 8] FIG. 4 is a cross-sectional view showing a state in which a first temporary fixing device is placed in a first mold. [Figure 9] FIG. 2 is a cross-sectional view of the molds in a state where the first mold and the second mold are clamped together. [Figure 10] FIG. 4 is a cross-sectional view showing a state in which a first temporary fixture and a stator are arranged in a first mold. [Figure 11] 1 is a cross-sectional view of a state in which resin has been injected into a mold and the resin has hardened. [Figure 12] FIG. 2 is a side view of the stator unit. [Figure 13] FIG. 1 is a cross-sectional view of a canned motor pump using a resin molded motor. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] Hereinafter, a manufacturing method of the stator unit 1 of the resin molded motor 10 according to an embodiment of the present invention, the stator unit 1 of the resin molded motor 10, and the resin molded motor 10 will be described with reference to the drawings. First, the manufacturing method of the stator unit 1 of the resin molded motor 10 will be described. As shown in FIG. 3, the stator unit 1 of this embodiment has a stator 11, a substrate 2, lead wires 3, a back casing 4, and a resin molded portion 8 that covers the stator 11. The stator 11 has a stator core 12 and an electromagnetic coil 13.

[0024] First, the temporary fixture 6 and the mold 7 used in the manufacturing method of the stator unit 1 will be described. The temporary fixture 6 is used to temporarily fix the lead wire 3 in a state in which it has a curved portion in part. In the mold clamping process, the lead wire 3 temporarily fixed by the temporary fixture 6 has one side of the curved portion of the lead wire 3 extending toward the substrate 2, and the other side of the curved portion of the lead wire 3 extending toward the external space. The external space is the space outside the first mold 71 and the second mold 72 that are clamped. In the mold clamping process and the molding process, the temporary fixture 6 has an internal space side portion 6a that is disposed between the temporary fixture holding portion 71b of the first mold 71 and the second mold 72 in the radial direction of the stator unit 1 on the internal space side in a state in which the first temporary fixture 61 and the second temporary fixture 62 are combined. The internal space is the internal space formed by the end faces of the first mold 71, the second mold 72, and the temporary fixture 6 that are clamped. Furthermore, the temporary fixture 6 has an external space side portion 6b that is disposed between the temporary fixture holding portion 71b of the first mold 71 and the second mold 72 in the mold clamping direction on the outer side of the first mold 71 and the second mold 72 in the mold clamping process and the molding process. As shown in FIG. 4, the temporary fixture 6 is configured in two parts, the first temporary fixture 61 and the second temporary fixture 62. In this embodiment, the first temporary fixture 61 and the second temporary fixture 62 each have two mating surfaces that are bent at a right angle. The two mating surfaces are an internal space side mating surface formed on the internal space side portion 6a of the temporary fixture 6 and an external space side mating surface formed on the external space side portion 6b of the temporary fixture 6. The second temporary fixture 62 has a substantially L-shape. As shown in FIGS. 4(a) and 4(b), the temporary fixture 6 is formed by overlapping and combining the substantially L-shaped second temporary fixture 62 on the first temporary fixture 61. The lead wire 3 is inserted between a first temporary fixing tool 61 and a second temporary fixing tool 62 of the temporary fixing tool 6. As shown in Fig. 4(c), the first temporary fixing tool 61 has an internal space side mating surface 61-1 and an external space side mating surface 61-2. A plurality of grooves 63 (four in the embodiment shown in Fig. 4) for fitting the lead wire 3 are formed in parallel on the internal space side mating surface 61-1 and the external space side mating surface 61-2.

[0025] As shown in FIG. 4(c), the groove 63 has a first groove 63-1 formed on the inner space side mating surface 61-1 and a second groove 63-2 formed on the outer space side mating surface 61-2. In the mold clamping process, one end of the first groove 63-1 faces the inner space of the mold 7, and one end of the second groove 63-2 faces the outer space of the mold 7. The first groove 63-1 and the second groove 63-2 are formed so as to be perpendicular to each other. As shown in FIG. 5, the first groove 63-1 is formed so that the lead wire 3 extending from the substrate 2 in parallel with the axis N of the resin molded motor can be fitted in a straight line as it is. The first groove 63-1 has a semicylindrical cross section, and half of the cross section of the lead wire 3 is fitted in it. The second groove 63-2 has a cross section in which a semicylindrical part and a vertically elongated part extending upward from the semicylindrical part are connected, and the entire cross section of the lead wire 3 is fitted in it.

[0026] Further, the groove 63 has a third groove 63-3 that connects the other end of the first groove 63-1 and the other end of the second groove 63-2. The third groove 63-3 is provided to bend the lead wire 3 at a right angle while curving it. The third groove 63-3 extends from the other end of the first groove 63-1 toward the other end of the second groove 63-2. The third groove 63-3 has a semicylindrical cross-sectional shape at the connection point with the first groove 63-1, and has a cross-sectional shape where a semicylindrical part and a vertically elongated part are connected at the connection point with the second groove 63-2. The cross-sectional shape of the third groove 63-3 is a shape where a semicylindrical part and a vertically elongated part extending from the semicylindrical part to the internal space side mating surface 61-1 and the external space side mating surface 61-2 are connected. The cross-sectional shape of the third groove 63-3 has a height of the elongated portion that changes between the connection point with the first groove 63-1 and the connection point with the second groove 63-2. Half of the cross section of the lead wire 3 is fitted into the third groove 63-3 at the connection point with the first groove 63-1, and then the area of ​​the cross section of the lead wire 3 that is fitted into the third groove 63-3 while bending increases. Then, the entire cross section of the lead wire 3 is fitted into the middle of the third groove 63-3, and then the lead wire 3 is bent with the entire cross section of the lead wire 3 fitted into the third groove 63-3, and then it is fitted into the second groove 63-2.

[0027] As shown in FIG. 4(c), the second temporary fixing tool 62 has an internal space side mating surface 62-1 and an external space side mating surface 62-2. The internal space side mating surface 62-1 has a plurality of grooves 64 (four in the embodiment shown in FIG. 4) for fitting the lead wire 3. The grooves 64 are formed only on the internal space side mating surface 62-1 that abuts against the internal space side mating surface 61-1 on which the first groove 63-1 of the first temporary fixing tool 61 is formed. The external space side mating surface 62-2 has no groove and is a flat surface. The groove 64 has a semicylindrical cross section, and half of the cross section of the lead wire 3 is fitted into it. When the first temporary fixing tool 61 and the second temporary fixing tool 62 are combined, the groove 64 and the first groove 63-1 of the groove 63 form a circular hole into which the lead wire 3 fits without any gaps. One end of the groove 64 faces the internal space of the mold 7. The other end of the groove 64 is closed. The other end of groove 64 is formed at a position facing third groove 63-3 of groove 63, and a part of groove 64 is combined with third groove 63-3 to fit lead wire 3. Groove 64 is arranged so that half of the cross section of lead wire 3 extending from substrate 2 in parallel with axis N (mold clamping direction of mold 7) can be fitted in linearly as it is, as shown in Fig. 5. In this embodiment, the sizes of groove 63 and groove 64 are set so that when groove 63 and groove 64 are combined to form a hole through which lead wire 3 is inserted, the cross section of the hole is slightly smaller than the cross section of lead wire 3.

[0028] In this embodiment, as shown in FIG. 5, the lead wire 3 is held in a state in which it is bent at a right angle to form a curved portion by the groove 63 and the groove 64, and temporarily fixed. When the temporary fixture 6 and the lead wire 3 are arranged in the mold 7, the lead wire 3 extending from the substrate 2 in parallel to the axis N of the resin molded motor enters the temporary fixture 6 as it is, is bent at a right angle, and then comes out of the temporary fixture 6 perpendicular to the axis N. The groove 63 and the groove 64 may be in any form that can hold the lead wire 3 in a state in which it has a curved portion on the way from the internal space to the outside, and temporarily fix it in the temporary fixture 6, and are not limited to this embodiment. Therefore, the angle at which the lead wire 3 is bent to form a curved portion is not limited to a right angle, and the angle between the first groove 63-1 and the second groove 63-2 is not limited to a right angle. Furthermore, the direction of the first groove 63-1 and groove 64 that receive the lead wires 3 extending from the substrate 2 is not limited to a direction completely parallel to the axis N, and may be slightly inclined with respect to the axis N. The number of grooves 63 and grooves 64 is also not limited, and can be changed according to the number of lead wires 3. The angle between the two mating surfaces of the first temporary fastener 61 and the second temporary fastener 62 is also not limited to a right angle.

[0029] The first temporary fixture 61 has a recess 65 formed in a portion facing the temporary fixture holding portion 71b of the first mold 71. The temporary fixture holding portion 71b of the first mold 71 is inserted into the recess 65, and the first temporary fixture 61 is held by the temporary fixture holding portion 71b. The second temporary fixture 62 has a first pressed surface 66 formed on the inner space side portion 6a and a second pressed surface 67 formed on the outer space side portion 6b as a pressed surface to be pressed by the second mold 72. In the mold clamping process, the second pressed surface 67 extends in the radial direction of the stator unit 1. In addition, the first pressed surface 66 is inclined in a direction away from the temporary fixture holding portion 71b toward the direction in which the second mold 72 moves during mold clamping in the mold clamping process. The first pressed surface 66 is connected to the second pressed surface 67 at 95°. The angle between the first pressed surface 66 and the second pressed surface 67 is not limited to 95°, but may be inclined with respect to the mold clamping direction. The first pressed surface 66 and the second pressed surface 67 are not limited to being directly connected, but may be connected via another surface or the like.

[0030] In this embodiment, as shown in Fig. 4, four grooves 63 and four grooves 64 are formed, and four lead wires 3 can be simultaneously held and temporarily fixed in a state in which the bent portions are formed, using one temporary fixture 6. If the die 7 holding the temporary fixture 6 becomes hot during resin molding, the temporary fixture 6 will be affected by the heat. For this reason, it is preferable that the temporary fixture 6 is made of a heat-resistant material, such as nylon or polyphenylene sulfide (PPS). The structure, shape, etc. of the temporary fixture 6 are not particularly limited, and other structures may be used.

[0031] As shown in Fig. 6, the mold 7 includes a first mold 71 and a second mold 72. As shown in Fig. 6 and Fig. 7, the first mold 71 includes a bottom 71a and a temporary fixing tool holding portion 71b. The temporary fixing tool holding portion 71b extends in the mold clamping direction of the first mold 71 and protrudes from the bottom 71a toward the second mold 72. As shown in Fig. 8, the temporary fixing tool holding portion 71b is inserted into the recess 65 of the first temporary fixing tool 61 in the mold clamping direction, thereby holding the first temporary fixing tool 61 so as not to move in the radial direction of the stator unit 1.

[0032] The second mold 72 is substantially cylindrical and has a space for accommodating the stator 11 and the like. As shown in FIG. 7, the side surface of the second mold 72 has a notch where the temporary fixing tool holding portion 71b of the first mold 71 is inserted. As shown in FIG. 9, the second mold 72 has a first pressing surface 74 and a second pressing surface 75 connected to the first pressing surface 74 as pressing surfaces for pressing the second temporary fixing tool 62. As shown in FIG. 9, in the mold clamping step, the first pressing surface 74 is an inclined surface that presses the first pressed surface 66 of the second temporary fixing tool 62, and the second pressing surface 75 presses the second pressed surface 67 of the second temporary fixing tool 62. The first pressing surface 74 is an inclined surface that is inclined from the connection point with the second pressing surface 75 in a direction away from the temporary fixing tool holding portion 71b toward the direction in which the second mold 72 moves when the mold 7 is clamped. The clamping direction of the mold 7 is the vertical direction indicated by the arrow A in FIG. 9, which is parallel to the axis N of the resin molded motor. The vertical direction is the direction in FIG. 9 of this embodiment, and the clamping direction is not limited to the vertical direction. The axis N of the resin molded motor coincides with the central axis of the cylindrical back casing 4. The first pressing surface 74 is connected to the second pressing surface 75 at an angle of 95°. The angle of the first pressing surface 74 with respect to the second pressing surface 75 is not limited to 95° and can be changed as appropriate. The second pressing surface 75 extends in the radial direction of the stator unit 1 from the connection point with the first pressing surface 74 toward the outside of the second mold 72. The direction in which the second pressing surface 75 extends is not limited to the radial direction of the stator unit 1, and may be inclined with respect to the radial direction of the stator unit 1.

[0033] As shown in FIG. 6, the temporary fixing tool holding portion 71b of the first mold 71 has an end surface 77 facing the second pressing surface 75 and an inner surface 78 facing the first pressing surface 74. The first pressing surface 74 and the second pressing surface 75 of the second mold 72, together with the temporary fixing tool holding portion 71b of the first mold 71, form a space separate from the internal space into which the resin of the mold 7 is injected, as shown in FIG. 6. The separate space is a space for holding the temporary fixing tool 6. As shown in FIG. 9, the mold clamping step sandwiches the external space side portion 6b of the temporary fixing tool 6 between the second pressing surface 75 of the second mold 72 and the end surface 77 of the temporary fixing tool holding portion 71b. At the same time, the internal space side portion 6a of the temporary fixing tool 6 is sandwiched between the first pressing surface 74 of the second mold 72 and the inner surface 78 of the temporary fixing tool holding portion 71b.

[0034] Next, there will be described each step of the manufacturing method of the stator unit 1. First, as a preparation step, the stator core 12 of the stator 11, the electromagnetic coil 13, the substrate 2, the lead wires 3, and the cylindrical back casing 4 are prepared.

[0035] Next, in the component assembly process, the stator core 12, electromagnetic coil 13, substrate 2, and lead wire 3 are assembled, and electrically connected where necessary. A conductive portion 5 is provided on substrate 2, and the end of lead wire 3 for connection to a power source is connected to substrate 2. At this time, lead wire 3 is connected to substrate 2 so as to extend in a direction parallel to axis N of the resin molded motor (direction perpendicular to substrate 2). Lead wire 3 is used that is covered with insulating coating material 31. A material that has good adhesion to resin is used as the material for insulating coating material 31. As a material that has good adhesion to resin, for example, cross-linked polyethylene is preferably used. By using a material that has good adhesion to resin as insulating coating material 31, insulating coating material 31 and resin molded part 8 molded from resin are more closely adhered to each other.

[0036] Next, as a member arrangement step, as shown in FIG. 5, the stator core 12, the electromagnetic coil 13, the substrate 2 to which the lead wires 3 are connected, the back casing 4, and the temporary fixture 6 are arranged in the first die 71 of the die 7. The order in which the above-mentioned multiple members are arranged in the first die 71 is not particularly limited. In this embodiment, in order to hold the first temporary fixture 61 in the first die 71 first, the temporary fixture holding portion 71b is inserted into the recess 65 of the first temporary fixture 61 to engage the first temporary fixture 61 with the first die 71 (see FIG. 8). In addition, when the back casing 4 is arranged in the first die 71, and the stator core 12 and the electromagnetic coil 13 are arranged on the outer periphery of the back casing 4, and the substrate 2 is arranged above the back casing 4, the stator core 12, the electromagnetic coil 13, the substrate 2, the lead wires 3, the back casing 4, and the temporary fixture 6 are arranged in the first die 71 as shown in FIG. 10.

[0037] When the combination of the stator core 12 and the like is placed in the first die 71 of the die 7, the four lead wires 3 extending parallel to the axis N from the conductive portion 5 of the substrate 2 are fitted into the four grooves 63 of the first temporary fixture 61. As shown in FIG. 10, first, the lead wires 3 are fitted into the first groove 63-1 of the groove 63 without being bent. At this time, half of the cross section of the lead wire 3 is fitted into the first groove 63-1. Thereafter, the lead wire 3 is fitted into the third groove 63-3 while being curved along the third groove 63-3. At this time, the lead wire 3, which initially has only half of its cross section fitted into it, is curved and the range of the cross section fitted into the third groove 63-3 gradually increases, and from the middle of the third groove 63-3, the entire cross section of the lead wire 3 is fitted into the third groove 63-3. The lead wire 3 that has been fitted into the third groove 63-3 and curved at a right angle is then fitted into the second groove 63-2. At this time, the entire cross section of the lead wire 3 is fitted into the second groove 63-2. Finally, as shown in FIG. 10, the remaining portion of the lead wire 3 is pulled out to the outside of the first temporary fixing device 61.

[0038] After fitting the lead wire 3 into the first temporary fixing device 61, the second temporary fixing device 62 is placed on top of the first temporary fixing device 61 to assemble the temporary fixing device 6. When the second temporary fixing device 62 is placed on the first temporary fixing device 61, half of the cross section of the lead wire 3 exposed from the first groove 63-1 and the remaining part of the lead wire 3 exposed from the third groove 63-3 are fitted into the groove 64. At this time, the range of the lead wire 3 that is fitted into the first groove 63-1 and the groove 64 is in contact with the first temporary fixing device 61 and the second temporary fixing device 62. When the temporary fixing device 6 is assembled, the lead wire 3 is fitted into the grooves 63 and 64, and is held and temporarily fixed by the temporary fixing device 6 in a state in which a bent portion bent at a right angle is formed. The lead wires 3 exposed between the temporary fixing device 6 and the conductive portion 5 in the mold 7 extend parallel to the axis N, and the lead wires 3 extending from the temporary fixing device 6 to the outside leave the mold 7 perpendicular to the axis N. At this time, depending on the shape of the temporary fixing device 6, the lead wires 3 in the mold 7 do not have to be parallel to the axis N, and the lead wires 3 extending to the outside do not have to be perpendicular to the axis N.

[0039] In this embodiment, if the lead wire 3 is simply held in a bent state at a right angle by the temporary fixing device 6, the internal space side mating surface 61-1 of the first temporary fixing device 61 and the internal space side mating surface 62-1 of the second temporary fixing device 62 are not in close contact with each other, and a gap is generated between the internal space side mating surface 61-1 and the internal space side mating surface 62-1. This gap is generated because the cross section of the lead wire 3 is larger than the cross section of the hole formed by the first groove 63-1 and the groove 64, and because the lead wire 3 and the first groove 63-1 and the groove 64 are not in close contact with each other. When the clamping process is performed to clamp the first mold 71 and the second mold 72, the first pressing surface 74 of the second mold 72 presses the first pressed surface 66 of the second temporary fastener 62, eliminating the gap between the internal space side mating surface 61-1 and the internal space side mating surface 62-1, and the internal space side mating surface 61-1 and the internal space side mating surface 62-1 come into contact with each other and are tightly adhered to each other. When the internal space side mating surface 61-1 and the internal space side mating surface 62-1 come into contact with each other, the lead wire 3 is in a state of being sufficiently tightly adhered to the first groove 63-1 and the groove 64. For the lead wire 3 other than the portion fitted in the first groove 63-1 and the groove 64 of the groove 63, a gap is generated between the lead wire 3 and the temporary fastener 6. It should be noted that the procedure for assembling the temporary fixing device 6 in the component arrangement process is not limited to the procedure described above. For example, it is also possible to assemble the first temporary fixing device 61 and the second temporary fixing device 62 in a state in which the lead wire 3 is sandwiched between them, and then hold the temporary fixing device 6 in the first mold 71.

[0040] After the member arrangement step, as shown in FIG. 9, a mold clamping step is performed in which the first mold 71 and the second mold 72 of the mold 7 are clamped together. At this time, the mold clamping direction is parallel to the axis N of the resin mold motor (the direction indicated by the arrow A in FIG. 9). When the mold clamping step is performed, the internal space side portion 6a of the temporary fixture 6 is sandwiched between the temporary fixture holding portion 71b of the first mold 71 and the first pressing surface 74 of the second mold 72. Furthermore, the external space side portion 6b of the temporary fixture 6 is sandwiched between the temporary fixture holding portion 71b of the first mold 71 and the second pressing surface 75. In this way, the temporary fixture 6 is pressed by the first mold 71 and the second mold 72, and a force is applied to it.

[0041] In this embodiment, how the force for clamping the first mold 71 and the second mold 72 of the mold 7 in the mold clamping process acts on the temporary fixture 6 will be described. Before the mold clamping, a gap is generated between the internal space side mating surface 61-1 of the first temporary fixture 61 and the internal space side mating surface 62-1 of the second temporary fixture 62, and therefore a gap is also generated between the first mold 71 and the second mold 72. Therefore, when a mold clamping force is applied to the first mold 71 and the second mold 72 in a direction parallel to the axis N, the mold clamping force moves the second mold 72 in a direction parallel to the axis N (downward in FIG. 9). Due to the movement of the second mold 72, the first pressing surface 74 of the second mold 72 moves in a direction approaching the first mold 71 (downward in FIG. 9) while remaining inclined. Since the first pressing surface 74 and the first pressed surface 66 are inclined with respect to the mold clamping direction, when the first pressing surface 74 moves in the mold clamping direction, the first pressing surface 74 of the second mold 72 presses the first pressed surface 66 of the second temporary fixing device 62.

[0042] When the first pressed surface 66 is pressed, the second temporary fastener 62 moves relative to the first temporary fastener 61 in a direction that eliminates the gap between the internal space side mating surface 62-1 and the internal space side mating surface 61-1 of the first temporary fastener 61. Then, the internal space side mating surface 62-1 of the second temporary fastener 62 and the internal space side mating surface 61-1 of the first temporary fastener 61 come into close contact with each other and are pressed against each other. In other words, the force that clamps the first mold 71 and the second mold 72 also acts in a direction that causes the internal space side mating surface 61-1 of the first temporary fastener 61 and the internal space side mating surface 62-1 of the second temporary fastener 62 to approach each other. In this way, when the internal space side mating surface 61-1 and the internal space side mating surface 62-1 are brought into close contact with each other by the force of mold clamping, the lead wire 3 fitted into the first groove 63-1 of the first temporary fastener 61 and the groove 64 of the second temporary fastener 62 is pressed by the first temporary fastener 61 and the second temporary fastener 62. Then, the lead wire 3 is brought into sufficient close contact with the first groove 63-1 and the groove 64.

[0043] After the mold clamping step of clamping the first mold 71 and the second mold 72 of the mold 7 together is completed, a molding step is carried out in which resin is injected into the mold 7 from an injection port (not shown) and the resin injected into the mold 7 is hardened to form the resin molded part 8, as shown in Fig. 11. The resin injected into the mold 7 is a thermosetting resin, for example, an unsaturated polyester resin.

[0044] In the mold clamping process, the lead wire 3 is sufficiently in close contact with the temporary fixture 6 at the portion where the first groove 63-1 and the groove 64 are formed. As shown by the arrow B in Fig. 9, a force acts in the radial direction of the stator unit 1, and the first pressing surface 74 of the second mold 72 presses the first pressed surface 66 of the second temporary fixture 62, so that the first pressing surface 74 and the first pressed surface 66 are also in close contact with each other. Furthermore, the internal space side mating surface 62-1 of the second temporary fixture 62 and the internal space side mating surface 61-1 of the first temporary fixture 61 are pressed against each other, so that the first temporary fixture 61 and the inner surface 78 of the temporary fixture holding portion 71b of the first mold 71 are also in close contact with each other. As a result, during the molding process, the resin injected into the mold 7 penetrates between the lead wire 3 and the first groove 63-1, between the lead wire 3 and the groove 64, between the first temporary fixing device 61 and the first mold 71, and between the second temporary fixing device 62 and the second mold 72, and is prevented from leaking out of the mold 7.

[0045] In the present embodiment, a configuration has been described in which the cross section of the hole formed by combining the grooves 63 and 64 is smaller than the cross section of the lead wire 3, so that a gap is generated between the internal space side mating surface 61-1 of the first temporary fastener 61 and the internal space side mating surface 62-1 of the second temporary fastener 62, and therefore when the first mold 71 and the second mold 72 are clamped, the first pressing surface 74 of the second mold 72 presses the first pressed surface 66 of the second temporary fastener 62 toward the temporary fastener holding portion 71b of the first mold 71. However, it is also possible to use another method to configure the first pressing surface 74 of the second mold 72 to press the first pressed surface 66 of the second temporary fastener 62 toward the temporary fastener holding portion 71b of the first mold 71 in the mold clamping step. For example, when no gap is generated between the mating surface of the first temporary fixing tool on the inner space side and the mating surface of the second temporary fixing tool on the inner space side, the size of the inner space side of the temporary fixing tool can be made slightly larger than the distance between the temporary fixing tool holding part of the first mold and the first pressing surface of the second mold, and the temporary fixing tool can be made of an elastically deformable material. When such a temporary fixing tool is used, in the mold clamping step, the first pressing surface of the second mold presses the first pressed surface of the second temporary fixing tool toward the temporary fixing tool holding part of the first mold, compressing the inner space side of the temporary fixing tool. At this time, the first pressing surface of the second mold and the first pressed surface of the second temporary fixing tool come into close contact with each other, and the first temporary fixing tool and the inner surface of the temporary fixing tool holding part of the first mold also come into close contact with each other.

[0046] 11, when the injected resin hardens and the resin molded portion 8 is formed, the metal mold 7 is opened, and a temporary fixing device removing step is performed to remove the temporary fixing device 6 from the lead wires 3. In the temporary fixing device removing step, first the first metal mold 71 and the second metal mold 72 are opened. Then, only the second temporary fixing device 62 is removed from the first metal mold 71. Furthermore, the stator unit 1 covered with the resin molded portion 8 is taken out of the first metal mold 71, and the lead wires 3 are removed from the first temporary fixing device 61.

[0047] When the temporary fixing tool removing step is finished and the stator unit 1 is taken out, the stator unit 1 as shown in Fig. 3 is completed. In the stator unit 1, the lead wires 3 covered with the insulating coating material 31 are directly exposed from the surface 8a of the resin molded portion 8 that intersects with the axis N of the resin molded motor 10 without using any fixing tool. When the molding of the resin molded portion 8 is completed, the lead wires 3 are removed from the temporary fixing tool 6 in the temporary fixing tool removing step, so the temporary fixing tool 6 is not a member used as a part of the stator unit 1. In this embodiment, the temporary fixing tool 6 is only used as a jig for the mold 7.

[0048] In the manufacturing method of the stator unit 1 of this embodiment, the stator unit 1 has a cylindrical back casing 4. The inside of the stator unit 1 is formed with a space by the back casing 4. Therefore, the resin molded part 8 does not exist in the back casing 4. However, the stator unit may be configured without using the back casing 4. In the case of a stator unit without using the back casing 4, the first mold is configured so that the mold is present in the part corresponding to the back casing 4 and the internal space of the back casing 4. The internal space of the stator unit can also be molded by the first mold. The form of the stator unit is not limited to this embodiment, and can be appropriately changed according to the application of the resin molded motor.

[0049] The stator unit 1 manufactured by the manufacturing method of this embodiment will be described in detail with reference to FIG. 3 and FIG. 12. As shown in FIG. 3, the stator unit 1 has a stator 11 resin-molded by a resin molded part 8. More specifically, the stator unit 1 has a stator core 12 of the stator 11, an electromagnetic coil 13, a substrate 2, lead wires 3, a back casing 4, and a resin molded part 8 that covers the stator 11. In the stator unit 1 of this embodiment, the back casing 4 is resin-molded together with the stator core 12, the electromagnetic coil 13, and the like. The back casing 4 is molded from synthetic resin or metal, and a first bearing part 41 that supports a shaft 93 (described later) is provided at the center of the top. The stator unit 1 of this embodiment has a back casing 4 to make the inside of the stator unit 1 watertight.

[0050] In this embodiment, the canned motor pump 100 is manufactured by incorporating a rotor 90 into the stator unit 1. The back casing 4 of the stator unit 1 forms the can of the canned motor pump 100. Therefore, when manufacturing a stator unit for a motor pump that is not a canned motor pump, it is sufficient to manufacture one that does not have a back casing 4. In the case of a stator unit that does not have a back casing 4, the first bearing portion 41 that was provided in the back casing 4 is separately provided, but the form of the first bearing portion 41 is not particularly limited. For example, a conventional bearing as disclosed in Patent Documents 1 and 2 can be used for the back casing 4 as appropriate.

[0051] As shown in FIG. 3, the stator unit 1 of this embodiment does not include a conventional fixing device, and the lead wire 3 is directly extended from the surface 8a of the resin molded part 8 that intersects with the axis N of the resin molded motor 10. The stator unit 1 does not include a connector, a fixing device, or the like on the side surface of the resin molded part 8 that surrounds the axis N of the resin molded motor 10. Therefore, no internal or external lead wires are present on the side surface of the resin molded part 8 of the stator unit 1 of this embodiment. By using the stator unit 1 in which the lead wire 3 is directly extended from the surface 8a that intersects with the axis N of the resin molded motor 10, the resin molded motor 10 can be made slim, and it is possible to accommodate a resin molded motor in which the radial space with respect to the axis N of the resin molded motor 10 is limited. In this embodiment, the surface 8a is perpendicular to the axis N of the resin molded motor 10, but the angle at which the surface 8a intersects with the axis N is not particularly limited and can be changed as appropriate. Moreover, the surface 8a is not limited to a flat surface.

[0052] The stator unit 1 has a structure that connects to a power source via the lead wires 3, and does not use a conventional embedded type fixing device. There is no risk of water intrusion due to a defect in the interface between the fixing device and the resin molded part in a water-exposed environment. When a resin-molded motor 10 having a stator unit 1 in which the lead wires 3 are directly exposed from the surface 8a of the resin molded part 8 is used in a water-exposed environment, water tries to intrude into the inside of the stator unit 1 along the interface between the resin molded part 8 and the lead wires 3. By covering the lead wires 3 with an insulating coating material 31 formed of a material that has good adhesion to the resin of the resin molded part 8, the insulating coating material 31 on the surface of the lead wires 3 and the resin molded part 8 are in close contact with each other. As a result, it becomes more difficult for water to intrude into the inside of the stator unit 1 from the interface between the lead wires 3 and the resin molded part 8 even in a water-exposed environment.

[0053] Next, a resin-molded motor 10 having a stator unit 1 will be described with reference to Fig. 13. In this embodiment, as shown in Fig. 13, a resin-molded motor 10 used in a canned motor pump 100 will be described. The resin-molded motor 10 of this embodiment is used as a motor section of the canned motor pump 100. The resin-molded motor 10 has a rotor 90, a stator unit 1 arranged on the outer periphery so as to surround the rotor 90, and a shaft 93 to which the rotor 90 is fixed.

[0054] The rotor 90 has a bracket 92 and a magnet 91 held by the bracket 92. The bracket 92 is rotatably attached to a shaft 93 by a sliding bearing 94. In the resin molded motor 10, when a driving current is supplied to the stator unit 1 through the lead wires 3 and the substrate 2, the rotor 90 rotates around the shaft 93 by the magnetic force generated by the stator unit 1. One end of the shaft 93 is fitted into and supported by the first bearing 41 of the back casing 4. The other end of the shaft 93 is supported by the second bearing 105.

[0055] Since the resin molded motor 10 of this embodiment is in the form of a motor used in a canned motor pump 100, the components of the pump section of the canned motor pump 100 will be briefly described with reference to Figure 13. The pump section of the canned motor pump 100 has a pump casing 101 and an impeller 102. The impeller 102 is housed in the pump casing 101. The impeller 102 is molded integrally with an end of a bracket 92 of the rotor 90 of the resin molded motor 10. This allows the rotor 90 and the impeller 102 to rotate integrally. The impeller 102 is not limited to a structure integral with the bracket 92, and can also be configured as a separate member.

[0056] The pump casing 101 is provided with an inlet 103 through which liquid flows into the canned motor pump 100 from outside the canned motor pump 100. The pump casing 101 is provided with a discharge port 104 through which the liquid that has flowed into the canned motor pump 100 flows through the space inside the back casing 4. The pump casing 101 is fixed to the stator unit 1 using bolts or the like. When the impeller 102 is rotated by the resin molded motor 10, the liquid flows into the canned motor pump 100 from the inlet 103, and then flows out from the discharge port 104 to the outside.

[0057] By using a resin-molded stator unit 1, the resin-molded motor 10 of this embodiment can have the lead wires 3 directly exposed from the surface 8a of the resin-molded portion 8 that intersects with the axis N of the resin-molded motor 10. Therefore, in the resin-molded motor 10 of this embodiment, there are no connectors, fasteners, etc. on the side surface of the resin-molded portion 8 that surrounds the axis N, and there are no internal or external lead wires either. This makes it possible to make the resin-molded motor 10 slim, and it can also be used with resin-molded motors that have limited radial space with respect to the axis N. [Industrial Applicability]

[0058] The present invention is applicable, for example, to resin-molded motors in which the size in the radial direction relative to the axis is limited, and to stator units of resin-molded motors. [Explanation of symbols]

[0059] 1 Stator unit 10 Resin molded motor 11 Stator 12 Stator core 13 Electromagnetic Coil 2. Board 3 Lead Wire 31 Insulating coating materials 4 Back casing 41 1st bearing part 5 Conductive part 6 Temporary Fixtures 6a Inner space side 6b Exterior space side 61 First temporary fixture 61-1 Internal space side mating surface 61-2 Exterior space side mating surface 62 Second temporary fixing device 62-1 Internal space side mating surface 62-2 Exterior space side mating surface 63 Groove 63-1 First groove 63-2 2nd groove 63-3 3rd groove 64 Groove 65 Recess 66 First pressed surface 67 Second pressed surface 7. Mold 71 First Mold 71a bottom 71b Temporary Fixture Holding Part 72 2nd Mold 74 First pressing surface 75 Second pressing surface 77 End face 78 Inner surface 8 Resin molded part 90 Rotor 91 Magnet 92 Bracket 93 Shaft 94 Plain bearings 100 Canned motor pump 101 Pump casing 102 Impeller 103 Inlet 104 Discharge port 105 2nd bearing part N axis

Claims

1. In a manufacturing method of a stator unit of a resin molded motor, a member arrangement process of arranging, in a first mold, a stator core, an electromagnetic coil, a substrate, lead wires having ends connected to the substrate, and a temporary fixing device for temporarily fixing the lead wires in a state in which a bent portion is formed in a part of the lead wire; a mold clamping step of clamping the first mold and the second mold; a molding process of injecting a resin into an internal space formed by end surfaces of the first mold and the second mold and the temporary fixing tool that are clamped, and hardening the injected resin to form a resin molded part; a temporary fixing tool removing step of opening the first mold and the second mold after molding the resin molded portion, and removing the temporary fixing tool from the lead wire; Including, the temporary fixing device includes a first temporary fixing device and a second temporary fixing device that are combined with each other, and the lead wire is inserted between the first temporary fixing device and the second temporary fixing device, The first temporary fixture is held by a portion of the first mold extending in a mold clamping direction (hereinafter, this portion is referred to as a "temporary fixture holding portion"). the second temporary fixture has a pressed surface to be pressed against the second mold, a groove into which the lead wire is fitted is formed in the first temporary fixing tool and / or the second temporary fixing tool along a mating surface between the first temporary fixing tool and the second temporary fixing tool; the temporary fixture has an internal space side portion disposed between the temporary fixture holding portion of the first mold and the second mold in the radial direction of the stator unit on the internal space side during the mold clamping step and the molding step, and an external space side portion disposed between the temporary fixture holding portion of the first mold and the second mold in the mold clamping direction on the exterior side of the first mold and the second mold, the pressed surface formed on the second temporary fixing tool has a first pressed surface formed on the inner space side and a second pressed surface formed on the outer space side, the first pressed surface being inclined in a direction away from the temporary fixing tool holding part toward a direction in which the second mold moves during mold clamping, a surface of the second mold that presses the first pressed surface (hereinafter referred to as a "first pressing surface") is also inclined in a direction away from the temporary fixing tool holding portion toward a direction in which the second mold moves during mold clamping, in the mold clamping step, when the first mold and the second mold are clamped, the first pressing surface of the second mold presses the first pressed surface of the second temporary fixture toward the temporary fixture holding portion of the first mold. A method for manufacturing a stator unit comprising the steps of:

2. one side of the bent portion of the lead wire extends toward the substrate, and the other side of the bent portion of the lead wire extends toward a space outside the first mold and the second mold (hereinafter referred to as the "external space"); the mating surfaces of the first temporary fixing tool and the second temporary fixing tool include an exterior space side mating surface formed on a portion of the temporary fixing tool that faces the exterior space, and an interior space side mating surface formed on a portion of the temporary fixing tool that faces the interior space, In the mold clamping step, when the first mold and the second mold are clamped, an internal space side mating surface of the first temporary fixing tool and an internal space side mating surface of the second temporary fixing tool are pressed against each other by the temporary fixing tool holding portion and the first pressing surface, and one side of the bent portion of the lead wire is in close contact with both the first temporary fixing tool and the second temporary fixing tool. The method for manufacturing a stator unit according to claim 1 .

3. a recess is formed in a portion of the first temporary fixing tool facing the temporary fixing tool holding part, the temporary fixing device holding portion is inserted into the recess in a mold clamping direction to hold the first temporary fixing device so as not to move in a radial direction of the stator unit.

3. The method for manufacturing a stator unit according to claim 1 or 2.

4. In the member arrangement step, the stator core and the electromagnetic coil are arranged on an outer periphery of a cylindrical back casing having a closed end adjacent to the substrate; placing the stator core, the electromagnetic coil, the substrate, the temporary fixture, the lead wires, and the back casing in the first mold; 3. The method for manufacturing a stator unit according to claim 1 or 2.

5. In a stator unit which is a resin-molded stator used in a resin-molded motor, The stator core, the electromagnetic coil, the substrate, and the lead wires connected to the substrate are molded in a resin molded portion, the lead wire is directly extended from a surface of the resin molded portion that intersects with an axis of the resin molded motor to the outside; A stator unit characterized by:

6. a cylindrical back casing having a closed end adjacent to the substrate; The stator core and the electromagnetic coil are disposed on the outer periphery of the back casing.

6. The stator unit according to claim 5.

7. In a resin molded motor having a resin molded stator unit, a rotor, the stator unit arranged to surround the rotor, and a shaft to which the rotor is fixed, 7. A resin molded motor, wherein the stator unit is the stator unit according to claim 5 or 6.

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