JP6815872B2 - Motors and motor manufacturing methods - Google Patents

Description

The present invention relates to a motor and a method for manufacturing the motor.

For example, an inner rotor type stator structure that is common among brushless motors includes a stator in which windings are wound and a rotor that is rotatably provided inside the stator in the radial direction. The stator has a cylindrical core main body and a plurality of teeth radially inward from the inner peripheral surface of the core main body. A slot with an inside opening in the radial direction is formed between the teeth. A winding is wound around each tooth through this slot.

By the way, it is effective to improve the space factor of the winding in order to improve the efficiency and miniaturization of the motor. However, a slot shape in which the radially inner side of the stator is open, such as an inner rotor type brushless motor, is compared with a slot shape in which the radially outer side is open, such as the stator structure of an outer rotor type brushless motor. Therefore, the opening width of the slot is small, and it is difficult to improve the space factor of the winding. For this reason, the core body may be divided into each tooth in the circumferential direction to form a divided core.

When forming a split core type core body, for example, a winding is wound around each tooth of each split core, and then each split core is assembled to form an annular core body. With this configuration, the winding can be wound around each tooth without considering the opening width of the slot, so that the space factor of the winding can be improved.

Here, in order to reduce the size and weight of the brushless motor, a technique of insert molding a stator into a resin housing (motor case) has been proposed (see, for example, Patent Document 1). This resin housing is formed in a bottomed tubular shape, and one end in the axial direction of the rotor can be rotatably supported by the bottom of the resin housing. When molding such a resin housing into a resin, it is desirable to spread the resin evenly and evenly around the stator. Therefore, one resin injection port of the mold is set at the center of the bottom of the resin housing in the radial direction.

JP 2015-33211

By the way, as in Patent Document 1 described above, when one resin injection port is set at the center of the bottom of the resin housing in the radial direction, the resin flows in the axial direction at the core main body of the stator. Further, the resin flows into both the inner peripheral surface side and the outer peripheral surface side of the core body at the same time. Then, in some cases, resin pressure may be applied from the inner peripheral surface side to the outer peripheral surface side of the core body.

In such a molding method, when the core body of the stator is composed of split cores, the resin pressure applied from the inner peripheral surface side to the outer peripheral surface side of the core body causes the binding force of the binding site between the split cores to be increased. It could be slightly weaker. In this way, if the coupling force of the split cores becomes slightly weak, the roundness of the radial inside (slot opening side) of the core body decreases, or a gap is formed between the split cores. There was a possibility that the motor performance would deteriorate due to insert molding as it was.
Further, for example, when an attempt is made to integrally mold a connector portion to which an external connector can be connected to a resin housing, the fluidity of the resin may deteriorate. Further, there is a possibility that parts having different wall thicknesses are easily formed in the entire resin housing, and sink marks are likely to occur during resin molding. Therefore, there is a possibility that the resin housing cannot be formed accurately.

Therefore, the present invention has been made in view of the above circumstances, and even when the stator is insert-molded, the motor performance can be prevented from deteriorating and the resin housing can be molded with high accuracy. And a method of manufacturing a motor.

In order to solve the above problems, the motor according to the present invention has a tubular core body and a tooth that projects radially inward from the inner peripheral surface of the core body and winds a winding. The first resin housing includes a stator in which the core body can be divided in the circumferential direction for each tooth, and a first resin housing that covers the periphery of the stator so that at least the radial inner end of the teeth is exposed. to the outer peripheral surface of the radially outer rib portion extending in the axial direction is formed, on a straight line along the said rib portion, the injection marks formed after injection of the resin material is disposed, It is characterized in that a resin flow path portion extending in the axial direction is formed on the outer peripheral surface of the first resin housing and at a position different from the rib portion .

As described above, the first resin housing has injection marks formed after the injection of the resin material on the outer outer peripheral surface in the radial direction. That is, when the resin is injected from the radial outer side of the core body of the stator after setting the stator in the mold, injection marks are formed on the outer peripheral surface of the first resin housing on the radial outer side.
Here, since the resin is injected from the radial outer side of the core body, the resin pressure is applied to the core body from the outer peripheral surface side to the inner peripheral surface side. That is, the divided core main body (hereinafter referred to as the divided core) exerts a force in the direction of being in close contact with each other due to the resin pressure. Therefore, it is possible to prevent a gap from being formed between the divided cores due to the weakening of the binding force of the binding site between the divided cores. As a result, it is possible to prevent the roundness of the inside of the core body in the radial direction (slot opening side) from being increased and the motor performance from being deteriorated. Further, by molding the first resin housing so that the radial inner end of the tooth is exposed, there are no inclusions between the stator radial inner side and the rotor when the completed motor is energized, so that from the stator side. The passage of magnetic flux to the rotor side becomes good.
Further, even when the resin is injected from the radial outside of the core body, it is possible to easily wrap the resin around the axial end portion of the core body via the rib portion. Therefore, the first resin housing can be easily formed with higher accuracy.
Further, during resin molding, the resin easily wraps around the axial end of the motor through the resin flow path. Therefore, it is possible to easily form the first resin housing with higher accuracy.

The motor according to the present invention is characterized by including a second resin housing formed so as to cover the first resin housing and having an expansion component mounting portion to which an expansion component can be mounted.

By forming the two-layer structure of the first resin housing and the second resin housing in this way, the wall thickness of the resin housings (first resin housing, second resin housing) formed at one time can be reduced. Therefore, even if the expansion component mounting portion is formed, deterioration of the hot water flow can be suppressed. In addition, the wall thickness of each resin housing can be easily made uniform as a whole, and sink marks during resin molding can be prevented. Therefore, the entire resin housing can be formed with high accuracy.

The motor according to the present invention includes a tubular core body, a stator having a tooth that projects radially inward from the inner peripheral surface of the core body, and a tooth around which a winding is wound, and at least the radial inner end of the tooth. A first resin housing that covers the periphery of the stator so as to be exposed, and a second resin housing that is formed so as to cover the first resin housing and has an expansion component mounting portion to which an expansion component can be mounted . The first resin housing has rib portions extending in the axial direction on the outer outer peripheral surface in the radial direction, and injection marks formed after injection of the resin material are formed on a straight line along the rib portions. It is characterized in that a resin flow path portion extending in the axial direction is formed on the outer peripheral surface of the first resin housing and at a position different from the rib portion .

By forming the two-layer structure of the first resin housing and the second resin housing in this way, the wall thickness of the resin housings (first resin housing, second resin housing) formed at one time can be reduced. Therefore, even if the expansion component mounting portion is formed, deterioration of the hot water flow can be suppressed. In addition, the wall thickness of each resin housing can be easily made uniform as a whole, and sink marks during resin molding can be prevented. Therefore, the entire resin housing can be formed with high accuracy. Further, by molding the first resin housing so that the radial inner end of the tooth is exposed, the radial inner end of the tooth can be used as a reference surface when molding the second resin housing. Further, when the completed motor is energized, there are no inclusions between the inside of the stator in the radial direction and the rotor, so that the magnetic flux from the stator side to the rotor side is well passed.
Further, the resin flow can be determined from the outer peripheral surface side to the inner peripheral surface side of the core body. Therefore, for example, the direction of the load applied to the winding can be limited to one direction by the resin pressure, and the position of the winding can be easily maintained. Therefore, it becomes easy to form the first resin housing, and the entire resin housing can be formed with high accuracy.
Further, even when the resin is injected from the radial outside of the core body, it is possible to easily wrap the resin around the axial end portion of the core body via the rib portion. Therefore, the first resin housing can be easily formed with higher accuracy.
Further, during resin molding, the resin easily wraps around the axial end portion of the motor through the resin flow path portion. Therefore, it is possible to easily form the first resin housing with higher accuracy.

In the motor according to the present invention, the winding has a crossover that is routed along the stator at the axial end of the stator and is wired so as to straddle between the teeth. An annular crossover restricting portion that presses the crossover from above to regulate displacement is provided at the axial end portion, and the first resin housing is formed so as to cover the stator and the crossover restricting portion. It is characterized by that.

Here, when the winding has a crossover, the crossover may be displaced by the resin pressure, and the crossover may not be insert-molded at a predetermined position. Therefore, by pressing the crossover wire from above by the crossover wire regulating portion, displacement of the crossover wire during resin molding can be prevented, and the crossover wire can be insert-molded at a predetermined position. Therefore, the entire resin housing can be formed with high accuracy.

The method for manufacturing a motor according to the present invention has a tubular core body and a tooth that protrudes inward in the radial direction from the inner peripheral surface of the core body and the winding is wound around the core body. This is a method of manufacturing a motor having a stator that can be divided in the circumferential direction for each, and after setting the stator in a mold, resin is injected from the radial outer side of the stator, and at least the radial inner end of the teeth is injected. It has a first housing forming step of forming a first resin housing covering the periphery of the stator so as to be exposed , and extends axially to the outer peripheral surface of the first resin housing in the first housing forming step. The rib portion is formed, and the resin injection port of the mold is arranged on a straight line along the position of the rib portion, and is the outer peripheral surface of the first resin housing and also with the rib portion. Is characterized in that resin flow path portions extending in the axial direction are formed at different positions .

Since the resin is injected from the radial outer side of the core body in this way, the resin pressure is applied to the core body from the outer peripheral surface side to the inner peripheral surface side. That is, the divided core main body (hereinafter referred to as the divided core) exerts a force in the direction of being in close contact with each other due to the resin pressure. Therefore, it is possible to prevent the divided cores from being separated and forming a gap between the divided cores. As a result, it is possible to prevent the motor performance from deteriorating. Further, by molding the first resin housing so that the radial inner end of the tooth is exposed, there are no inclusions between the stator radial inner side and the rotor when the completed motor is energized, so that from the stator side. The passage of magnetic flux to the rotor side becomes good.
Further, the resin flow can be determined from the outer peripheral surface side to the inner peripheral surface side of the core body. Therefore, for example, the direction of the load applied to the winding can be limited to one direction by the resin pressure, and the position of the winding can be easily maintained. Therefore, it becomes easy to form the first resin housing, and the entire resin housing can be formed with high accuracy.
Further, during resin molding, the resin easily wraps around the axial end of the motor through the resin flow path. Therefore, it is possible to easily form the first resin housing with higher accuracy.

The method for manufacturing a motor according to the present invention includes a second housing forming step of forming a second resin housing so as to cover the first resin housing after the first housing forming step, and the second resin housing has a second housing forming step. , It is characterized by having an expansion component mounting portion to which an expansion component can be mounted.

By adopting such a manufacturing method, the wall thickness of the resin housings (first resin housing, second resin housing) formed at one time can be increased by forming a two-layer structure of the first resin housing and the second resin housing. Can be thinned. Therefore, even if the expansion component mounting portion is formed, deterioration of the hot water flow can be suppressed. In addition, the wall thickness of each resin housing can be easily made uniform as a whole, and sink marks during resin molding can be prevented. Therefore, the entire resin housing can be formed with high accuracy.

The method for manufacturing a motor according to the present invention is a method for manufacturing a motor having a tubular core main body and a stator having teeth protruding inward in the radial direction from the inner peripheral surface of the core main body and winding a winding. A first housing forming step of forming a first resin housing that covers the periphery of the stator so that at least the radially inner end of the teeth is exposed after the stator is set in the mold, and the first housing. After the housing forming step, the second housing forming step of forming the second resin housing so as to cover the first resin housing is provided, and the second resin housing has an expansion component mounting portion to which the expansion component can be mounted. Then , in the first housing forming step, resin is injected from the radial outside of the stator to form a rib portion extending in the axial direction on the outer peripheral surface of the first resin housing, and the position of the rib portion becomes the rib portion. The resin injection port of the mold is arranged on a straight line along the above, and the resin flow extends in the axial direction on the outer peripheral surface of the first resin housing and at a position different from the rib portion. It is characterized in that a road portion is formed .

By forming the two-layer structure of the first resin housing and the second resin housing in this way, the wall thickness of the resin housings (first resin housing, second resin housing) formed at one time can be reduced. Therefore, even if the expansion component mounting portion is formed, deterioration of the hot water flow can be suppressed. In addition, the wall thickness of each resin housing can be easily made uniform as a whole, and sink marks during resin molding can be prevented. Therefore, the entire resin housing can be formed with high accuracy. Further, by molding the first resin housing so that the radial inner end of the tooth is exposed, the radial inner end of the tooth can be used as a reference surface when molding the second resin housing. Further, when the completed motor is energized, there are no inclusions between the inside of the stator in the radial direction and the rotor, so that the magnetic flux from the stator side to the rotor side is well passed.
Further, the resin flow can be determined from the outer peripheral surface side to the inner peripheral surface side of the core body. Therefore, for example, the direction of the load applied to the winding can be limited to one direction by the resin pressure, and the position of the winding can be easily maintained. Therefore, it becomes easy to form the first resin housing, and the entire resin housing can be formed with high accuracy.
Further, even when the resin is injected from the radial outside of the core body, it is possible to easily wrap the resin around the axial end portion of the core body via the rib portion. Therefore, the first resin housing can be easily formed with higher accuracy.
Further, during resin molding, the resin easily wraps around the axial end portion of the motor through the resin flow path portion. Therefore, it is possible to easily form the first resin housing with higher accuracy.

In the method of manufacturing a motor according to the present invention, the winding has a crossover that is routed along the stator at the axial end of the stator and is wired so as to straddle the teeth. An annular crossover restrictor that controls displacement by pressing the crossover from above is provided at the axial end of the stator so as to cover the stator and the crossover restrictor in the first housing forming step. It is characterized by forming the first resin housing.

By pressing the crossover wire from above by the crossover wire regulating portion in this way, displacement of the crossover wire during resin molding can be prevented, and the crossover wire can be insert-molded at a predetermined position. Therefore, the entire resin housing can be formed with high accuracy.

According to the present invention, since the resin is injected from the radial outer side of the core body, the resin pressure can be applied to the core body from the outer peripheral surface side to the inner peripheral surface side. That is, the divided core main body (hereinafter referred to as the divided core) exerts a force in the direction of being in close contact with each other due to the resin pressure. Therefore, it is possible to prevent the stator from being insert-molded while a gap is formed between the divided cores in which the binding force of the binding site between the divided cores is weakened. As a result, it is possible to prevent the roundness of the inside of the core body in the radial direction (slot opening side) from being increased and the motor performance from being deteriorated.

Further, by forming the two-layer structure of the first resin housing and the second resin housing, the wall thickness of the resin housings (first resin housing, second resin housing) formed at one time can be reduced. Therefore, even if the expansion component mounting portion is formed, deterioration of the hot water flow can be suppressed. In addition, the wall thickness of each resin housing can be easily made uniform as a whole, and sink marks during resin molding can be prevented. Therefore, the entire resin housing can be formed with high accuracy.

It is a perspective view of the electric pump in 1st Embodiment of this invention. It is a perspective view of the motor case in 1st Embodiment of this invention. It is sectional drawing which follows the AA line of FIG. It is a perspective view of the stator according to 1st Embodiment of this invention. It is a perspective view of the split core in 1st Embodiment of this invention. It is a perspective view of the stator premolded by the 1st resin housing in 1st Embodiment of this invention. It is explanatory drawing about the manufacturing method of the motor case in 1st Embodiment of this invention. It is a perspective view of the stator in the 2nd Embodiment of this invention.

Next, an embodiment of the present invention will be described with reference to the drawings.

(First Embodiment)
(Electric pump)
FIG. 1 is a perspective view of the electric pump 1.
As shown in the figure, the electric pump 1 is for supplying oil to a mission (all not shown) mounted on an automobile, for example, in order to drive the mission. In the electric pump 1, the motor unit 2, the pump unit 3 connected to the motor unit 2 and arranged coaxially with the motor unit 2, and the control unit 4 that controls the drive of the motor unit 2 are integrated. ..
In the following description, the axial direction of the rotating shaft 81 of the motor unit 2 is simply referred to as the axial direction, the direction orthogonal to the axial direction and the radial direction of the rotating shaft 81 is simply referred to as the radial direction of the rotating shaft 81. The direction of rotation will be described simply as the circumferential direction.

The motor unit 2 includes a motor case 50 made of resin, a stator 40 (see FIG. 3) insert-molded in the motor case 50, and a rotor 80 rotatably supported by the motor case 50. There is. The motor unit 2 is a so-called brushless motor that supplies electric power from the control unit 4 to the stator 40 without using a brush. The details of the motor case 50 and the stator 40 will be described later.

The rotor 80 includes a rotating shaft 81 and a rotor core 82 that is externally fitted and fixed to the rotating shaft 81. A plurality of permanent magnets (not shown) are embedded in the outer peripheral surface of the rotor core 82 at equal intervals in the circumferential direction. A magnetic attractive force or repulsive force is generated between these permanent magnets and the stator 40, and the rotor 80 rotates. One end of the rotating shaft 81 of the rotor 80 is connected to the pump unit 3.

The pump unit 3 is arranged on the motor unit 2 and is for sucking and discharging oil. The pump unit 3 has, for example, a pump case 94 and a bracket 93, which are each formed by die-casting aluminum.
The pump case 94 is formed in a flat block shape, and is arranged so as to overlap the motor case 50 on one end surface in the axial direction of the motor case 50. A trochoidal pump (not shown) is housed in the pump case 94, for example. This pump is connected to the rotor 80 of the motor unit 2.

On the other hand, the bracket 93 is arranged on one surface of the pump case 94 on the opposite side of the motor case 50 so as to overlap the pump case 94. The bracket 93 is also formed in a flat block shape. One side of the bracket 93 opposite to the pump case 94 is attached to a mission (not shown). A bolt seat 113 for fixing the electric pump 1 to the transmission is formed on the outer peripheral portion of the bracket 93 so as to project along the surface direction of the bracket 93. A through hole 114 through which a bolt (not shown) can be inserted is formed in the bolt seat 113. Further, the bracket 93 is formed with an oil passage (not shown) communicating with the pump provided in the pump case 94. A pump (not shown) and an oil passage on the mission side are connected via this oil passage.

The control unit 4 includes a substrate (not shown) housed in the substrate storage unit 52 described later of the motor case 50. A plurality of switching elements such as FETs (Field Effect Transistors) that control the current supplied to the stator 40 are mounted on the substrate.

(Motor case)
FIG. 2 is a perspective view of the motor case 50 in which the stator 40 is insert-molded. FIG. 3 is a cross-sectional view taken along the line AA of FIG.
As shown in FIGS. 2 and 3, the motor case 50 is integrally molded with the substantially bottomed tubular case body 51 in which the stator 40 is embedded and the outer peripheral surface 51a of the case body 51 to form the control unit 4. It is composed of a board storage portion 52. The substrate accommodating portion 52 is formed so as to have a substantially rectangular shape in a plan view in the axial direction, and has a box shape having an opening 52a on the surface on the pump case 94 side.

Further, a connector housing 54 is integrally molded on one side of the substrate storage portion 52. A connector (not shown) extending from an external device is fitted into the connector housing 54. The external device supplies electric power to the stator 40 and outputs a control signal via a substrate (not shown).

One end 55a of the connector terminal 55 projects into the connector housing 54. The other end 55b of the connector terminal 55 projects from the bottom surface 52b of the board housing portion 52. The other end 55b of the connector terminal 55 is electrically connected to a substrate (not shown).
Further, one end 56a of a connection terminal 56 for electrically connecting the winding 5 of the stator 40 to the substrate (not shown) is projected from the bottom surface 52b of the substrate storage portion 52. The other end 56b (see FIG. 6) of the connection terminal 56 is embedded in the board accommodating portion 52 and connected to the winding 5.

On the other hand, the case body 51 is formed so that the opening 51b faces the same direction as the opening 52a of the substrate storage portion 52. Further, the case body 51 is formed so that the end surface 51c on the opening 51b side is substantially flush with the peripheral edge of the opening 52a of the substrate storage portion 52. Further, two bolt seats 57 are integrally molded on the outer peripheral surface 51a of the case body 51 on the opening 51b side.

The bolt seat 57 is for fixing the motor case 50 to an external device (not shown). The two bolt seats 57 are arranged so as to face each other with the radial center of the case body 51 interposed therebetween. The bolt seat 57 is formed so as to project outward in the radial direction from the outer peripheral surface 51a of the case body 51. The bolt seat 57 is formed with a through hole through which a bolt (not shown) can be inserted along the axial direction, and the collar 58 is mounted therein. The collar 58 is made of, for example, carbon steel or the like.

Here, the pump case 94 also has a through hole (not shown) formed at a position corresponding to the bolt seat 57 of the case body 51, and further, the bracket 93 corresponds to the bolt seat 57 of the case body 51. A female screw part (not shown) is engraved at the position. Then, a bolt 59 (see FIG. 1) is inserted from the bolt seat 57 side of the case body 51, and this bolt is screwed into the female screw portion of the bracket 93 through the through hole of the pump case 94. As a result, the motor case 50, the pump body 92, and the bracket 93 are integrally fastened and fixed.

(Stator)
FIG. 4 is a perspective view of the stator 40.
As shown in the figure, the stator 40 is formed in a substantially cylindrical shape, and is embedded in the case main body 51 in a state where the axial direction of the stator 40 and the axial direction of the case main body 51 coincide with each other.
The core body 11 of the stator 40 has a substantially cylindrical back yoke 31. Further, the core main body 11 includes a plurality of teeth 32 formed so as to project radially inward from the back yoke 31, an insulating insulator 33 mounted so as to cover the periphery of the teeth 32, and the insulator 33. It includes a winding 5 wound around the teeth 32 from above. Then, by winding the winding 5 around each tooth 32, a plurality of coils 6 are formed.

The stator 40 of the present embodiment is provided with six teeth 32 and has a three-phase (U-phase, V-phase, W-phase) structure. The teeth 32 of each phase are arranged side by side in the circumferential direction in the order of U phase, V phase, and W phase. That is, the teeth 32 located on both sides of the two teeth 32 are the in-phase teeth 32.

(Split core)
Here, the back yoke 31 of the core main body 11 adopts a split core system that can be divided in the circumferential direction. That is, the back yoke 31 of the core main body 11 is configured by annularly connecting the divided cores 10 divided into a plurality of parts in the circumferential direction.

FIG. 5 is a perspective view of the split core 10.
As shown in the figure, the split core 10 is formed by stacking a plurality of metal plates, for example, and has a split back yoke 30 extending in the circumferential direction. The split back yoke 30 is a portion that forms an annular magnetic path of the back yoke 31 when the split cores 10 are connected in an annular shape. The split back yoke 30 is formed in a substantially arc shape in cross section.

Both ends of the split back yoke 30 in the circumferential direction are connecting portions 12a and 12b that are connected to the other split back yoke 30 by press fitting. One connecting portion 12a has a convex shape, and the other connecting portion 12b has a concave shape that can accept the connecting portion 12a.
As shown in FIG. 4, in a state where the divided cores 10 are connected via the connecting portions 12a and 12b (a state in which the back yoke 31 is formed), the connecting portions 12a, are formed on the outer peripheral surface 31a of the back yoke 31. A recess 31b along the axial direction is formed by the connecting portions 12a and 12b at the portion where the 12b is formed.

Further, on the inner peripheral surface of the split back yoke 30, the teeth 32 are formed so as to project from substantially the center in the circumferential direction toward the inside in the radial direction (the rotation center side of the rotor). That is, each divided core 10 includes one tooth 32.
The teeth 32 has a substantially T-shaped cross section orthogonal to the axial direction, and has a flange portion 14 extending along both sides in the circumferential direction at the inner end in the radial direction. Then, a winding 5 is wound from above the insulator 33 between the split back yoke 30 of the teeth 32 and the flange portion 14.

The insulator 33 includes a first insulator 16 and a second insulator 17. The first insulator 16 and the second insulator 17 are mounted so as to sandwich the teeth 32 from both ends 10a and 10b in the axial direction of the split core 10, respectively. Each of the insulators 16 and 17 has insulator bodies 16a and 17a that cover the teeth 32 while exposing the connecting portions 12a and 12b of the flange portion 14 and the split back yoke 30.

In the insulator main bodies 16a and 17a, an outer wall portion 18a and an inner wall portion 18b that are erected along the axial direction are integrally molded at locations corresponding to both end portions 10a and 10b of the split core 10.
The outer wall portion 18a is arranged at a position corresponding to the root portion of the teeth 32, and is formed in a cross-sectional arc shape so as to extend along the circumferential direction. Two slits 19a and 19b (first slit 19a and second slit 19b) are formed on the outer wall portion 18a at equal intervals in the circumferential direction. These slits 19a and 19b are for pulling out the winding wire 5 wound around the teeth 32 radially outward. Further, at substantially the center of the outer wall portion 18a in the circumferential direction, an engaging claw 33a that engages with the floating prevention ring 7 described later is formed so as to project outward in the radial direction.

On the other hand, the inner wall portion 18b is arranged at a portion corresponding to the radial inner end surface of the collar portion 14, and is formed in an arc-shaped cross section so as to extend along the circumferential direction. That is, the length of the outer wall portion 18a in the circumferential direction is set longer than the length of the inner wall portion 18b in the circumferential direction. A recess 20 is formed in most of the center of the inner wall portion 18b in the circumferential direction. The depth of the recess 20 is set to be shallower than the depth of the slits 19a and 19b of the outer wall portion 18a.

Under such a configuration, the winding 5 is continuously wound around each divided core 10. Therefore, the crossover line 62 (see FIG. 4) is formed by straddling the winding 5 between the divided cores 10 (each tooth 32). Then, as shown in FIG. 4, after that, the divided cores 10 are connected to form the stator 40. At this time, the crossover line 62 is wired along the outer peripheral surface of the outer wall portion 18a of the first insulator 16.

(Floating prevention ring)
A floating prevention ring 7 is provided on the first insulator 16 on the side where the crossover line 62 of the stator 40 is wired (upper in the axial direction in FIG. 4). The floating prevention ring 7 is for suppressing the fluttering of the crossover line 62 and preventing the crossover line 62 from floating from the first insulator 16. The float prevention ring 7 is made of resin.

The floating prevention ring 7 is formed in a ring shape so as to surround the outer wall portion 18a of the first insulator 16. The outer diameter of the floating prevention ring 7 is set to be substantially the same as the outer diameter of the back yoke 31. That is, the crossover line 62 wired on the first insulator 16 is covered with the floating prevention ring 7 from the upper side in the axial direction. As a result, the crossover line 62 is prevented from rising.

Further, on the inner peripheral surface of the floating prevention ring 7, a crossover wire retainer 73 is integrally molded at a position corresponding between the adjacent divided cores 10. The crossover presser 73 is for regulating the lift (displacement) of the crossover 62 located between the adjacent split cores 10.
The crossover wire retainer 73 is formed so as to project inward in the radial direction from the floating prevention ring 7. Further, the crossover wire retainer 73 is formed in a triangular shape so as to taper toward the end of the stator 40 in the axial direction. Then, the crossover line 62 is pressed by one side 73a that is inclined with respect to the axial direction. Therefore, the displacement of the crossover line 62 is regulated by the crossover wire retainer 73 while being pressed on the inner side in the radial direction and on the side opposite to the floating prevention ring 7 in the axial direction (lower side in the axial direction in FIG. 4).

Further, the floating prevention ring 7 is formed with an engaging recess 7a at a position corresponding to the engaging claw 33a protruding from the outer wall portion 18a of the first insulator 16. The engaging recess 7a can be engaged with the engaging claw 33a. As a result, the floating prevention ring 7 is snap-fit-fixed on the first insulator 16.

Further, a substantially rectangular parallelepiped connection base portion 75 is integrally molded on one side of the floating prevention ring 7. A connection terminal 56 is embedded in the connection base portion 75 so as to correspond to three phases. The connection terminal 56 is formed in a substantially L-shaped cross section, and is arranged so that one end 56a side is along the axial direction and the other end 56b side is along the radial direction. Then, one end 56a of the connection terminal 56 protrudes from the bottom surface 52b (see FIG. 2) of the substrate storage portion 52.

Here, as shown in FIG. 3, the stator 40 is premolded and then insert-molded into the case body 51 of the motor case 50. That is, the motor case 50 is composed of a first resin housing (premolded body) 121 formed by premolding the stator 40 described later, and a second resin housing 122 formed so as to cover the first resin housing 121. Has been done. In other words, the case body 51 of the motor case 50 has a two-layer structure of a first resin housing 121 and a second resin housing 122 that covers the first resin housing 122. Then, the substrate storage portion 52 as the second resin housing 122 is integrally molded with the second resin housing 122 of the case body 51. Hereinafter, the first resin housing 121 will be described in detail.

(1st resin housing)
FIG. 6 is a perspective view of the stator 40 premolded by the first resin housing 121.
As shown in FIGS. 3 and 6, the first resin housing 121 includes a housing main body 123 that covers the inner and outer circumferences of each divided core 10, a first end housing 124 that covers the first insulator 16 and the floating prevention ring 7. The second end housing 125 that covers the second insulator 17 is integrally molded.
The housing body 123 covers the recess 31b (see FIG. 4) formed on the outer peripheral surface of the stator 40, and resin between the divided cores 10 so as to expose the inner peripheral surface of the flange portion 14 of the teeth 32. Is filled and formed.

The first end housing 124 is formed by integrally molding the first end main body 127 that covers the first insulator 16 and the floating prevention ring 7, and the base covering portion 128 that covers the connection base portion 75. The first end main body 127 is also filled in the gap between the windings 5 housed in the first insulator 16. Further, the inner diameter of the inner peripheral surface 127a of the first end main body 127 is set to be the same as the inner diameter of the inner peripheral surface 123a of the housing main body 123. As a result, the inner peripheral surface 123a of the housing main body 123 and the inner peripheral surface 127a of the first end main body 127 become flush with each other.

On the other hand, the outer peripheral surface 127b of the first end main body 127 is formed to have a larger diameter than the back yoke 31 of the stator 40. Further, the first end body 127 covers the first insulator 16 side (upper side in FIGS. 3 and 6) of the outer peripheral surface 31a of the back yoke 31 so as to have the same height as the base covering portion 128 in the axial direction. It is formed like this. Further, the outer peripheral surface 127b of the first end main body 127 is inclined so as to taper toward the outer side in the axial direction (upper side in FIGS. 3 and 6).

The base covering portion 128 is formed so as to expose one end 56a of the connection terminal 56. Further, the base covering portion 128 is formed with three groove portions 126 on one surface 128a on the side opposite to the side on which one end 56a of the connection terminal 56 is projected. Each groove portion 126 is arranged at a position corresponding to the other end 56b of each connection terminal 56, and the other end 56b of each connection terminal 56 is exposed from the base covering portion 128 via these groove portions 126. Further, one surface 128a of the base covering portion 128 and the end portion 127c of the first end portion main body 127 on the one surface 128a side are flush with each other.

On the other hand, the second end housing 125 is formed so as to cover the second insulator 17 while filling the gap between the windings 5 housed in the second insulator 17 with resin. Further, the inner diameter of the inner peripheral surface 125a of the second end housing 125 is set to be the same as the inner diameter of the inner peripheral surface 123a of the housing main body 123. As a result, the inner peripheral surface 125a of the second end housing 125 and the inner peripheral surface 123a of the housing body 123 become flush with each other. Further, the outer diameter of the outer peripheral surface 125b of the second end housing 125 is set to be the same as the outer diameter of the outer peripheral surface 123b of the housing main body 123. As a result, the outer peripheral surface 125b of the second end housing 125 and the outer peripheral surface 123b of the housing body 123 become flush with each other.

Further, in the first resin housing 121, rib portions 129 are formed at two positions at an angle of approximately 120 degrees so as to straddle between the first end housing 124 and the second end housing 125. More specifically, each rib portion 129 is slightly more than the axially outer end of the outer peripheral surface 125b of the second end housing 125 from the end 127c of the first end body 127 constituting the first end housing 124. It is formed up to the front. The rib portion 129 is inclined so that the side surface 129a on the outer side in the radial direction is tapered from the first end housing 124 toward the tip on the second end housing 125 side. Further, each rib portion 129 is formed so as to extend along the axial direction, and is arranged at a position facing one of a plurality of recesses 31b (see FIG. 4) formed on the outer peripheral surface of the stator 40 in the radial direction. ing.

Further, the first resin housing 121 is equivalent to the rib portion 129 so as to straddle between the first end housing 124 and the second end housing 125 and at an angle of approximately 120 degrees from each rib portion 129. A resin flow path portion 131 having a shape is formed.
Although the details will be described later, in the resin flow path portion 131, the molten resin injected from the two resin injection ports 119 at the time of resin molding of the first resin housing 121 is in the mold 120 on the resin flow path portion 131 side. Improve the fluidity of the molten resin so that it is evenly distributed. That is, the resin flow path portion 131 also functions as a resin flow path for reducing resin filling unevenness. That is, the temperature of the molten resin decreases from the resin injection port 119 to the resin flow path portion 131 side, and the fluidity decreases. Therefore, the resin flow path portion 131 causes the fluidity of the resin in the vicinity thereof. Is secured. The molten resin injected from the two resin injection ports 119 merges near the resin flow path 131 via the end 127c of the first end body 127, and passes through the resin dew 131 on the second end housing 125 side. It spreads to.

(Method of forming the motor case)
Next, a method of manufacturing the motor case 50 will be described with reference to FIG. 7.
FIG. 7 is an explanatory diagram of a method of manufacturing the motor case 50.
As shown in the figure, in forming the motor case 50, first, the stator 40 is premolded to form the first resin housing 121. At this time, the split core 10 in which the winding 5 is wound in advance is connected in an annular shape to form the stator 40. Further, the floating prevention ring 7 is snap-fit-fixed on the first insulator 16 of the stator 40.

Then, such a stator 40 is set in the mold 120. Here, the outer peripheral surface of the stator 40 has a shape in which the surface excluding the recess 31b is exposed, and the inner peripheral surface of the flange portion 14 is also exposed. Therefore, the stator 40 can be positioned with respect to the mold 120 by utilizing the outer peripheral surface and the inner peripheral surface of the exposed stator 40. That is, by bringing the exposed outer peripheral surface and inner peripheral surface of the stator 40 into contact with the mold 120, the stator 40 can be positioned with respect to the mold 120 with high accuracy.

Further, the mold 120 has a resin injection port 119 at a position corresponding to the rib portion 129 of the first resin housing 121 on the outer peripheral surface (outer peripheral surface 31a of the back yoke 31) of the stator 40 in the radial direction. It is provided. Further, the resin injection port 119 is arranged on a straight line near the end portion 127c of the outer peripheral surface 127b of the first end portion main body 127 and along the position of the rib portion 129. The molten resin is injected into the mold 120 through such a resin injection port 119 to form the first resin housing 121 (first housing forming step).

Here, the resin injection port 119 is arranged on a straight line along the position of the rib portion 129. Therefore, the resin that has flowed in from the resin injection port 119 flows into the second insulator 17 from the outside in the radial direction through the flow path that becomes the rib portion 129 (see arrow Y1 in FIG. 7). Further, the resin flows into the first insulator 16 from the outside in the radial direction (see arrow Y2 in FIG. 7).
Further, a recess 31b is formed on the outer peripheral surface of the stator 40 at a position where the rib portion 129 is formed. Therefore, since the recess 31b is formed, a large flow path of the resin flowing to the insulators 16 and 17 is secured, and the flow of the hot water of the resin is improved.

The resin that has flowed into the insulators 16 and 17 flows further into the interior (see arrow Y3 in FIG. 7) and is filled between the adjacent teeth 32 in the circumferential direction. Then, the molten resin merges on the resin flow path portion 131 side to form the base covering portion 126, and after the resin is completely filled in the mold 120, cooling is performed. As a result, the first resin housing 121 that covers the periphery of the stator 40 is formed.

Here, since the first resin housing 121 is injection-molded using the mold 120, the first resin housing 121 removed from the mold 120 is at a position corresponding to the resin injection port 119, that is, the outer circumference on the outer side in the radial direction. Two resin injection marks 130 are formed on the surface (the outer peripheral surface 127b of the first end housing 124).
Further, as described above, in forming the first resin housing 121, the flow direction of the molten resin is the outer peripheral surface of the stator 40, that is, the direction from the radial outer side to the radial inner direction. Therefore, resin pressure is applied to each of the divided cores 10 from the outer peripheral surface 30b side of the divided back yoke 30 toward the inner side in the radial direction. That is, a force acts on each of the divided cores 10 in the direction of being in close contact with each other due to the resin pressure.

Subsequently, secondary molding is performed using the stator 40 premolded by the first resin housing 121 to form the second resin housing 122 (second housing forming step). At this time, the connection terminal 56 and the connector terminal 55 are set in the mold (not shown) used in the second housing forming step. Then, the second resin housing 122 is formed, and the production of the motor case 50 is completed.

(Operation of electric pump)
Next, the operation of the electric pump 1 will be described.
The current supplied to the substrate (not shown) via the connector terminal 55 of the connector housing 54 is selectively supplied to the coil 6 wound around the stator 40. As a result, a desired magnetic flux is formed in the stator 40. This magnetic flux and the permanent magnet (not shown) of the rotor 80 generate a magnetic attraction or repulsion, and the rotor 80 rotates. When the rotor 80 rotates, the pump unit 3 is driven accordingly. As a result, oil is supplied to, for example, a mission mounted on an automobile.

As described above, in the above-mentioned first embodiment, the first resin housing 121 is first formed when the stator 40 is insert-molded. The first resin housing 121 is formed with two resin injection marks 130 on the outer peripheral surface in the radial direction, that is, the outer peripheral surface 127b of the first end housing 124. That is, in forming the first resin housing 121, the flow direction of the molten resin is from the radial outer side of the stator 40 to the radial inner direction. Therefore, resin pressure is applied to each of the divided cores 10 from the outer peripheral surface 30b side of the divided back yoke 30 toward the inner side in the radial direction. That is, a force acts on each of the divided cores 10 in a direction in which they are in close contact with each other due to the resin pressure. Therefore, it is possible to prevent the stator 40 from being insert-molded while a gap is formed between the divided cores 10 due to the weakening of the binding force of the binding site between the divided cores 10. As a result, it is possible to prevent the roundness of the inner side (slot opening side) of the core body 11 in the radial direction from being increased and the motor performance from being deteriorated.

Further, the flow of the resin when forming the first resin housing 121 can be limited to one direction from the outer side in the radial direction to the inner side in the radial direction. Therefore, for example, when the winding 5 wound around the stator 40 is unwound under the resin pressure, the unwinding direction can be limited to one direction. Therefore, the first resin housing 121 can be easily formed, and the first resin housing 121 can be formed with high accuracy.

Further, the resin injection marks 130 of the first resin housing 121 are arranged on a straight line along the rib portion 129. That is, the resin flowing in from the resin injection port 119 of the mold 120 passes through the flow path that becomes the rib portion 129, so that the hot water flow is good, and the teeth 32 that are adjacent to each other in the insulators 16 and 17 and in the circumferential direction. It is possible to easily fill the resin between them. Therefore, the first resin housing 121 can be easily formed with higher accuracy.
Further, a recess 31b is formed on the outer peripheral surface of the stator 40 at a position where the rib portion 129 is formed. Therefore, since the recess 31b is formed, a large flow path of the resin flowing to the insulators 16 and 17 is secured, and the flow of the hot water of the resin can be further improved.

Further, the motor case 50 has a two-layer structure of a first resin housing 121 formed by premolding the stator 40 and a second resin housing 122 formed so as to cover the first resin housing 121. Then, a substrate storage portion 52, which is an expansion component mounting portion, is integrally molded in the second resin housing 122. Therefore, the wall thickness of each resin molded body (first resin housing 121, second resin housing 122) can be reduced as compared with the case where the motor case 50 is formed at one time. Therefore, even when the substrate accommodating portion 52 is integrally provided in the motor case 50, deterioration of the flow of the resin to the substrate accommodating portion 52 can be suppressed. In addition, the wall thickness of the first resin housing 121 and the second resin housing 122 can be easily made uniform as a whole, and sink marks during resin molding can be prevented. Therefore, the entire motor case 50 can be formed with high accuracy.

Further, in the flange portion 14 of the teeth 32, a resin is filled between the divided cores 10 so as to expose the inner peripheral surface, and the first resin housing 121 is formed. Therefore, the inner peripheral surface of the flange portion 14 of the teeth 32 can be used as the reference surface when molding the second resin housing 122. Further, when the completed motor portion 2 is energized, there are no inclusions between the inside of the stator 40 in the radial direction and the rotor 80, so that the magnetic flux from the stator 40 side to the rotor 80 side is well passed.
Further, a floating prevention ring 7 for preventing the crossover wire 62 from rising is provided on the first insulator 16 on the side where the crossover wire 62 of the stator 40 is wired. Then, when the first resin housing 121 is formed (when the stator 40 is premolded), the first resin housing 121 is configured to cover the floating prevention ring 7.

Here, when the first resin housing 121 is formed, the crossover wire 62 may be displaced due to the resin pressure, and the crossover wire 62 may not be insert-molded at a predetermined position. Therefore, by pressing the crossover 62 from above with the float prevention ring 7, the crossover 62 can be prevented from being displaced during resin molding, and the crossover 62 can be insert-molded at a predetermined position. As a result, the entire first resin housing 121 can be formed with high accuracy.
Further, by insert-molding the floating prevention ring 7 into the first resin housing 121, it is possible to reduce complicated resin flow paths when forming the second resin housing 122. Therefore, the second resin housing 122 can be formed easily and with high accuracy.

Further, the first resin housing 121 is equivalent to the rib portion 129 so as to straddle between the first end housing 124 and the second end housing 125 and at an angle of approximately 120 degrees from each rib portion 129. A resin flow path portion 131 having a shape is formed. Therefore, at the time of resin molding of the first resin housing 121, the fluidity of the molten resin so that the molten resin injected from the two resin injection ports 119 is evenly distributed on the resin flow path portion 131 side in the mold 120. Can be improved. Therefore, the first resin housing 121 can be molded with high accuracy.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS. 6 and 7 with reference to FIG.
FIG. 8 is a perspective view of the stator 240 according to the second embodiment, and corresponds to FIG. 4 described above. In the same embodiment as in the first embodiment, the same reference numerals are given and the description thereof will be omitted.
As shown in the figure, the stator 240 in the second embodiment is not configured to be divisible in the circumferential direction. This point is different from the stator 40 of the first embodiment described above.

That is, the core main body 211 of the stator 240 has a substantially cylindrical back yoke 231. Further, the core main body 211 includes a plurality of teeth 32 formed so as to project radially inward from the back yoke 231, an insulating insulator 33 mounted so as to cover the periphery of the teeth 32, and the insulator 33. It includes a winding 5 wound around the teeth 32 from above. Then, by winding the winding 5 around each tooth 32, a plurality of coils 6 are formed.

Under such a configuration, when the stator 240 is insert-molded into the motor case 50, the method of forming the motor case 50 is the same as that of the first embodiment described above. That is, when the stator 240 is insert-molded into the motor case 50, the stator 240 is first premolded to form the first resin housing 121 (first housing forming step). At this time, in the mold 120 (see FIG. 7), the outer peripheral surface of the stator 240 in the radial direction (outer peripheral surface 31a of the back yoke 231) corresponds to the rib portion 129 (see FIG. 6) of the first resin housing 121. Inject the resin from the position where it is to be used. Therefore, in the resin-molded first resin housing 121, a resin injection mark 130 (see FIG. 6) is formed on the outer peripheral surface (outer peripheral surface 127b of the first end housing 124) on the outer side in the radial direction.

Subsequently, secondary molding is performed using the stator 240 premolded by the first resin housing 121 to form the second resin housing 122 (second housing forming step). At this time, the connection terminal 56 and the connector terminal 55 are set in the mold (not shown) used in the second housing forming step. Then, the second resin housing 122 is formed, and the production of the motor case 50 is completed.

Therefore, according to the second embodiment described above, the wall thickness of each resin molded body (first resin housing 121, second resin housing 122) can be reduced as compared with the case where the motor case 50 is formed at one time. Therefore, even when the substrate accommodating portion 52 is integrally provided in the motor case 50, deterioration of the flow of the resin to the substrate accommodating portion 52 can be suppressed. In addition, the wall thickness of the first resin housing 121 and the second resin housing 122 can be easily made uniform as a whole, and sink marks during resin molding can be prevented. Therefore, the entire motor case 50 can be formed with high accuracy.

Further, since the flow of the resin when forming the first resin housing 121 can be limited to one direction from the outer side in the radial direction to the inner side in the radial direction, for example, the winding wound around the stator 240 under the resin pressure. When 5 is unwound, the unwinding direction can be limited to one direction. Therefore, the first resin housing 121 can be easily formed, and the first resin housing 121 can be formed with high accuracy.

Further, the resin injection marks 130 of the first resin housing 121 are arranged on a straight line along the rib portion 129. That is, the resin flowing in from the resin injection port 119 of the mold 120 passes through the flow path that becomes the rib portion 129, so that the hot water flow is good, and the teeth 32 that are adjacent to each other in the insulators 16 and 17 and in the circumferential direction. It is possible to easily fill the resin between them. Therefore, the first resin housing 121 can be easily formed with higher accuracy.
Further, a recess 31b is formed on the outer peripheral surface of the stator 40 at a position where the rib portion 129 is formed. Therefore, since the recess 31b is formed, a large flow path of the resin flowing to the insulators 16 and 17 is secured, and the flow of the hot water of the resin can be further improved.

Further, a floating prevention ring 7 for preventing the crossover wire 62 from rising is provided on the first insulator 16 on the side where the crossover wire 62 of the stator 240 is wired. By pressing the crossover 62 from above with the floating prevention ring 7 in this way, the displacement of the crossover 62 during resin molding can be prevented, and the crossover 62 can be insert-molded at a predetermined position. As a result, the entire first resin housing 121 can be formed with high accuracy.
Further, by insert-molding the floating prevention ring 7 into the first resin housing 121, it is possible to reduce the complicated flow path of the resin when forming the second resin housing 122. Therefore, the second resin housing 122 can be formed easily and with high accuracy.

The present invention is not limited to the above-described embodiment, and includes various modifications of the above-described embodiment without departing from the spirit of the present invention.
For example, in the above-described embodiment, the case where the electric pump 1 is for supplying oil to a mission mounted on an automobile (neither of which is shown) is described. However, the electric pump 1 is not limited to this, and the electric pump 1 can be used for various purposes.

Further, in the above-described embodiment, the case where the stator 40 of the pump unit 3 is insert-molded into the motor case 50 constituting the electric pump 1 has been described. However, the present invention is not limited to this, and a configuration in which the stator 40 is insert-molded may be adopted as the motor unit 2 alone.
Further, in the above-described embodiment, the case where the stators 40 and 240 are provided with six teeth 32 and have a three-phase (U-phase, V-phase, W-phase) structure has been described. However, the number is not limited to this, and the number of teeth 32 and the number of permanent magnets (not shown) of the rotor 80 can be arbitrarily set.

Further, in the above-described embodiment, the resin injection port 119 of the mold 120 is the outer peripheral surface (outer peripheral surface 31a of the back yoke 31) of the stator 40 in the radial direction, and is the rib portion 129 of the first resin housing 121. The case where it is arranged on a straight line along the position has been described. However, the present invention is not limited to this, and the resin injection port 119 may be provided at a position different from that of the rib portion 129. Further, the resin injection port 119 may be provided at a position where the resin can be injected from the outer peripheral surface of the stator 40 in the radial direction. However, in this case, in order to secure the resin flow path on the outer peripheral surface 31a side of the back yoke 31, depending on the position of the resin injection port 119, a resin flow path may be formed on the outer peripheral surface 31a of the back yoke 31 or the back yoke 31 may be formed. It is necessary to cover the entire outer peripheral surface 31a of the above with the first resin housing 121 to secure a resin flow path.

Further, in the above-described embodiment, the case where the substrate accommodating portion 52 constituting the control unit 4 as the expansion component mounting portion is integrally molded with the second resin housing 122 has been described. However, the present invention is not limited to this, and various types of expansion component mounting portions can be integrally molded in the second resin housing 122. For example, only the connector housing 54 may be integrally molded instead of the substrate storage portion 52.

Further, in the above-described embodiment, the case where the rib portions 129 are formed at two positions in the first resin housing 121 has been described. However, the number of rib portions 129 is not limited to this, and the number of rib portions 129 can be set arbitrarily. However, when the resin injection port 119 is arranged on a straight line along the rib portion 129, the resin pressure when forming the first resin housing 121 acts from the radial outer side to the radial inner side of the stator 40. It is desirable to provide at least two rib portions 129. In other words, it is desirable that at least two resin injection marks 130 are formed in the first resin housing 121.

Further, in the above-described embodiment, the case where one resin flow path portion 131 is formed in the first housing 121 has been described. However, the number is not limited to this, and the number of resin flow path portions 131 can be arbitrarily set.

2 ... Motor part, 5 ... Winding, 7 ... Floating prevention ring (crossover regulation part), 11,211 ... Core body, 32 ... Teeth, 40, 240 ... stator, 52 ... Board housing part (extension part mounting part) , 62 ... Crossing wire, 119 ... Resin inlet, 120 ... Mold, 121 ... First resin housing, 122 ... Second resin housing, 123 ... Housing body, 124 ... First end housing, 125 ... Second end Housing, 129 ... rib part, 130 ... resin injection mark (injection mark), 131 ... resin flow path part

Claims (8)

A stator having a tubular core body and teeth that protrude inward in the radial direction from the inner peripheral surface of the core body and around which windings are wound, and the core body can be divided into each tooth in the circumferential direction. ,
A first resin housing that covers the periphery of the stator so that at least the radial inner edge of the tooth is exposed.
With
Wherein the first resin housing, the outer peripheral surface of the radially outer, and the rib portion extending in the axial direction are formed, on a straight line along the said rib portion, the injection marks formed after the injection of the resin material Have been placed and
A motor characterized in that a resin flow path portion extending in the axial direction is formed on the outer peripheral surface of the first resin housing and at a position different from the rib portion . The motor according to claim 1, further comprising a second resin housing formed so as to cover the first resin housing and having an expansion component mounting portion to which an expansion component can be mounted. A tubular core body, and a stator having a tooth that projects radially inward from the inner peripheral surface of the core body and winds a winding.
A first resin housing that covers the periphery of the stator so that at least the radial inner edge of the tooth is exposed.
A second resin housing formed so as to cover the first resin housing and having an expansion component mounting portion to which the expansion component can be mounted.
Equipped with a,
The first resin housing has rib portions extending in the axial direction on the outer peripheral surface in the radial direction, and injection marks formed after injection of the resin material are formed on a straight line along the rib portions. Have been placed and
A motor characterized in that a resin flow path portion extending in the axial direction is formed on the outer peripheral surface of the first resin housing and at a position different from the rib portion . The winding has a crossover that is routed along the stator at the axial end of the stator and is routed across the teeth.
An annular crossover restricting portion is provided at the axial end of the stator by pressing the crossover from above to regulate displacement.
The motor according to any one of claims 1 to 3 , wherein the first resin housing is formed so as to cover the stator and the crossover regulation portion. A stator having a tubular core body and teeth that protrude inward in the radial direction from the inner peripheral surface of the core body and around which windings are wound, and the core body can be divided into each tooth in the circumferential direction. It is a manufacturing method of the motor to have
After setting the stator in the mold, resin is injected from the radial outer side of the stator to form a first resin housing that covers the periphery of the stator so that at least the radial inner end of the teeth is exposed. has a first housing forming step,
In the first housing forming step, a rib portion extending in the axial direction is formed on the outer peripheral surface of the first resin housing, and the resin injection port of the mold is formed on a straight line along the position of the rib portion. Along with being arranged, a resin flow path portion extending in the axial direction is formed on the outer peripheral surface of the first resin housing and at a position different from the rib portion. How to make a motor. After the first housing forming step, there is a second housing forming step of forming the second resin housing so as to cover the first resin housing.
The method for manufacturing a motor according to claim 5 , wherein the second resin housing has an expansion component mounting portion to which an expansion component can be mounted. A method for manufacturing a motor having a tubular core body and a stator having teeth protruding inward in the radial direction from the inner peripheral surface of the core body and winding a winding.
After setting the stator in the mold, a first housing forming step of forming a first resin housing that covers the periphery of the stator so that at least the radial inner end of the tooth is exposed.
After the first housing forming step, there is a second housing forming step of forming the second resin housing so as to cover the first resin housing.
The second resin housing has an expansion component mounting portion to which the expansion component can be mounted .
In the first housing forming step, resin is injected from the radial outside of the stator to form a rib portion extending in the axial direction on the outer peripheral surface of the first resin housing, and along the position of the rib portion. The resin injection port of the mold is arranged on a straight line, and the resin flow path portion extends in the axial direction on the outer peripheral surface of the first resin housing and at a position different from the rib portion. A method of manufacturing a motor, characterized in that. The winding has a crossover that is routed along the stator at the axial end of the stator and is routed across the teeth.
An annular crossover restricting portion is provided at the axial end of the stator by pressing the crossover from above to regulate displacement.
The motor according to any one of claims 5 to 7 , wherein in the first housing forming step, the first resin housing is formed so as to cover the stator and the crossover regulation portion. Production method.

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