JP2021114864A - Height measuring method of opening part and manufacturing method of rotor core - Google Patents

Abstract

To measure the heigh of an opening part with high accuracy.SOLUTION: A measuring method of the height of an opening part 36 measures the height of an opening part 36 from one side surface 20B in an axial direction of a rotor core 20 in the rotor core 20 comprising: a shaft hole 33 into which a shaft 23 is inserted; and a coolant passage 35 having the opening part 36 opened to an inner surface 33A of the shaft hole 33. The measuring method of the height of the opening part 36 comprises: a contact step of inserting a rod-like member 61 into the opening part 36 and bringing the rod-like member 61 into contact with an inner surface 35S in the coolant passage 35; a detection step of detecting a position where the rod-like member 61 is in contact with the inner surface 35S of the coolant passage 35; and a calculation step of calculating the height of the opening part 36 from one side surface 20B in the axial direction of the rotor core 20 on the basis of a position of the detected rod-like member 61.SELECTED DRAWING: Figure 6

Description

The present disclosure relates to a method for measuring the height of an opening and a method for manufacturing a rotor core.

Patent Document 1 discloses a method for inspecting a rotor in which a cooling flow path through which a refrigerant flows is formed. In this inspection method, a light projecting portion is arranged at a position (opposing position) in front of the opening of the radial flow path of the cooling flow path, and a light receiving portion is placed at the opening of the stacking direction flow path of the cooling flow path. The light is arranged and the light projected from the light projecting unit is received by the light receiving unit to inspect the penetration state of the cooling flow path.

Japanese Unexamined Patent Publication No. 2016-201892

By the way, if the position of the opening of the radial flow path is deviated from the shaft, the refrigerant may not be sufficiently circulated inside the rotor core. Therefore, there is a demand for a technique for accurately measuring the height of the opening of the radial flow path in the cooling flow path.

The opening of the radial flow path in the cooling flow path is open to the inner surface of the shaft hole, and it is difficult to accurately measure the height of the opening in the limited space inside the shaft hole. Further, the rotor core may have burrs on the opening edge of the opening, and it is difficult to accurately measure the height of the opening due to the influence of burrs.

An object of the present disclosure is to provide a method for measuring the height of an opening and a method for manufacturing a rotor core, which can accurately measure the height of the opening even in a limited space in a shaft hole.

The method of measuring the height of the opening of the present disclosure is a method of measuring the height of an opening in a rotor core having a shaft hole into which a shaft is inserted and a refrigerant flow path having an opening that opens on the inner surface of the shaft hole in the axial direction of the rotor core. A measuring method for measuring the height from one surface to the opening, which includes a contact step of inserting a rod-shaped member into the opening and bringing the rod-shaped member into contact with the inner surface of the refrigerant flow path, and the rod-shaped member. Based on the detection step of detecting the position where the member comes into contact with the inner surface of the refrigerant flow path and the detected position of the rod-shaped member, the height from the one side surface to the opening in the axial direction of the rotor core. It is provided with a calculation process for calculating.

The rotor core manufacturing method of the present disclosure is a manufacturing method for manufacturing a rotor core including a shaft hole into which a shaft is inserted and a refrigerant flow path having an opening that opens on the inner surface of the shaft hole, and is a manufacturing method for manufacturing a plurality of electromagnetic waves. A rotor core forming step of laminating steel plates to form the rotor core and a measuring step of measuring the height from one surface of the rotor core in the axial direction to the opening are provided, and the measuring step includes the measuring step. A contact step of inserting a rod-shaped member into the opening and bringing the rod-shaped member into contact with the inner surface of the refrigerant flow path, and a detection step of detecting a position where the rod-shaped member contacts the inner surface of the refrigerant flow path were detected. From the one side surface measured in the measurement step, including a calculation step of calculating the height from the one side surface to the opening in the axial direction of the rotor core based on the position of the rod-shaped member. The height to the opening is fed back to the rotor core forming step, and an adjusting step of adjusting the number of the electromagnetic steel sheets to be laminated is further provided.

According to the present disclosure, the height of the opening can be accurately measured even in a limited space in the shaft hole.

FIG. 1 is a plan view schematically showing the rotor core according to the first embodiment. FIG. 2 is a cross-sectional view taken along the line II-II of FIG. FIG. 3 is an explanatory diagram illustrating the operation of the inspection device in the measurement process. FIG. 4 is an explanatory view showing a state before the rod-shaped member comes into contact with the inner surface of the refrigerant flow path. FIG. 5 is an explanatory diagram showing a process in which the rod-shaped member comes into contact with the inner surface of the refrigerant flow path. FIG. 6 is an explanatory view showing a state after the rod-shaped member comes into contact with the inner surface of the refrigerant flow path. FIG. 7 is an explanatory view showing a state in which the first member and the second member are in contact with each other again.

<Embodiment 1>
In this embodiment, the present invention is applied to the manufacture of the rotor core 20 shown in FIG.

As shown in FIGS. 1 and 2, the rotor core 20 includes a rotor core main body 30 made of a laminated body in which a plurality of electromagnetic steel sheets 31 are laminated. End plates 21 and 21 are welded to both sides of the rotor core main body 30 in the stacking direction. The rotor core body 30 has a cylindrical shape as a whole. A plurality of blocks 32 are laminated on the rotor core main body 30, and are fixed to each other by means such as adhesion and welding. Each of the plurality of blocks 32 has a plurality of electrical steel sheets 31 laminated and assembled to each other. In FIG. 2, for convenience of explanation, the thickness and the number of the electromagnetic steel sheets 31 are changed and drawn schematically.

The rotor core main body 30 has a shaft hole 33 and a magnet hole 34. The shaft hole 33 is provided so as to penetrate the center of the rotor core main body 30. The shaft 23 is inserted into the shaft hole 33. As shown in FIG. 1, a plurality of magnet holes 34 are provided around the shaft holes 33. A magnet material 26 is sealed in each of the plurality of magnet holes 34. The magnet material 26 is made of a square columnar permanent magnet.

The shaft 23 has a cylindrical shape and constitutes a rotation center axis of the rotor core 20. Inside the shaft 23, a shaft-side refrigerant flow path 24 through which a refrigerant such as cooling oil flows is formed. A plurality of shaft-side openings 25 of the shaft-side refrigerant flow path 24 are formed on the outer peripheral surface of the shaft 23 at intervals in the circumferential direction (see FIG. 2). The shaft-side opening 25 is a supply port for supplying the cooling oil from the shaft-side refrigerant flow path 24 to the rotor core main body 30.

As shown in FIG. 2, a refrigerant flow path 35 through which the refrigerant flows is formed inside the rotor core 20. The refrigerant flow path 35 has an inner opening (opening) 36 that opens to the inner surface 33A of the shaft hole 33, and outer openings 37 and 37 that open to the upper surface 20A and the lower surface 20B of the rotor core 20, respectively. .. The inner opening 36 is provided in the vicinity of the central portion in the axial direction of the shaft hole 33. The inner opening 36 is an introduction port that communicates with the shaft side opening 25 of the shaft 23 to introduce the refrigerant into the rotor core 20. The outer openings 37, 37 are outlets that open toward the outside of the rotor core 20 and discharge the refrigerant from the inside of the rotor core 20. The refrigerant flow path 35 is formed by laminating electromagnetic steel sheets 31 having holes having different shapes when viewed in a plane.

The refrigerant flow path 35 has an inner flow path 35A, branch flow paths 35B and 35B, and an outer flow path 35C. The inner flow path 35A extends from the inner opening 36 toward the outer side in the radial direction of the shaft hole 33. The branch flow paths 35B and 35B branch up and down on the outside of the inner flow path 35A, and extend while bending toward the outer side in the radial direction of the shaft hole 33. The outer flow path 35C extends from the outside of the branch flow paths 35B and 35B to the outer opening 37 in the axial direction of the shaft hole 33. A plurality of refrigerant flow paths 35 are provided corresponding to each of the plurality of shaft-side openings 25. In the plurality of refrigerant flow paths 35, the outer flow path 35C is provided close to the pair of magnet materials 26 adjacent to each other (see FIG. 1). By providing the rotor core 20 with such a refrigerant flow path 35, it is possible to prevent the magnet material 26 from becoming hot as the rotor rotates.

Next, a method of manufacturing the rotor core 20 will be described. The rotor core 20 is manufactured on a production line including a press device, an inspection device 50, a control device, and the like. The pressing device presses the base material to be sent out in multiple stages to punch out the electromagnetic steel sheet 31 constituting the rotor core 20. Various devices such as the press device and the inspection device 50 are controlled by the control device. The control device includes a CPU that performs arithmetic processing according to a program, a ROM that stores various operation programs such as a manufacturing program, and a memory such as a RAM that has a work area.

As shown in FIG. 3, the inspection device 50 includes a mounting table 51, a base member 53, and a measuring unit 60 for measuring the height of the inner opening 36. The rotor core 20 is mounted on the upper surface of the mounting table 51. As shown in FIG. 4, the mounting table 51 is provided with a storage space 52 in which the measurement unit 60 is housed. The accommodation space 52 is provided in a form of communicating with the shaft hole 33 of the rotor core 20 mounted on the mounting table 51.

The base member 53 is installed above the mounting table 51. The base member 53 is configured to be movable between a standby position retracted above the upper surface 20A of the rotor core 20 mounted on the mounting table 51 and a descending position displaced downward from the standby position. The base member 53 applies a load by sandwiching the rotor core 20 between itself and the mounting table 51 at the lowered position. The base member 53 and the mounting table 51 form a pair of pressure members that apply a load along the stacking direction of the rotor core 20.

The measuring unit 60 is configured to be movable between a standby position accommodated in the accommodation space 52 of the mounting table 51 and an ascending position that has risen from the standby position and entered the shaft hole 33. At the ascending position of the measuring unit 60, the tip of the rod-shaped member 61 is located in front of the inner opening 36 in the radial direction of the shaft hole 33. The measuring unit 60 is configured to be movable between an ascending position where the tip of the rod-shaped member 61 is located in front of the inner opening 36 and a measuring position where the tip of the rod-shaped member 61 is located behind the inner opening 36. Has been done.

As shown in FIGS. 4 and 6, the measuring unit 60 includes a first member 62 having a rod-shaped member 61, a second member 63 in separably contacting the first member 62, and the first member 62 and the first member 62. It has a sensor 65 that detects contact and separation of the two members 63. The first member 62 is arranged relatively upward, and the second member 63 is arranged relatively downward. The first member 62 and the second member 63 are connected by a vertically extending shaft portion 64 (see FIG. 6), and are configured to be movable in directions toward and away from each other along the axial direction of the shaft portion 64. ing. On the other hand, the rotational displacement of the first member 62 with respect to the second member 63 is regulated. The first member 62 and the second member 63 are urged toward each other, and the contact state is maintained in a state where no external force is applied. In a state where no external force is applied, the first member 62 is driven by the movement of the second member 63. The sensor 65 is, for example, a proximity sensor, and detects contact and separation between the first member 62 and the second member 63.

As shown in FIGS. 4 and 5, the rod-shaped member 61 has a contact between the rod-shaped protrusion 61A protruding from the first member 62 in the radial direction (horizontal direction) of the shaft hole 33 and the tip of the protrusion 61A. It has a part 61B and. As the rod-shaped member 61, a member called a stylus used as a probe for three-dimensional measurement can be used. The protrusion 61A has a length dimension that allows the contact portion 61B inserted into the inner opening 36 to be held in the inner flow path 35A in the refrigerant flow path 35. The contact portion 61B has a spherical shape having a diameter larger than that of the protrusion 61A, and is provided with a clearance in the inner opening 36 so that it can be inserted. The surface of the contact portion 61B makes point contact with the inner surface 35S of the inner flow path 35A. The rod-shaped member 61 is configured to come into contact with the inner surface 35S of the inner flow path 35A at a position behind the opening edge of the inner opening 36.

The method for manufacturing the rotor core 20 includes a rotor core forming step for forming the rotor core 20, a measuring step for measuring the height of the inner opening 36, and an adjusting step for adjusting the number of laminated electromagnetic steel sheets 31. The rotor core forming step further includes a sealing step of sealing the magnet material 26 on a laminated body of a plurality of electromagnetic steel sheets 31, a welding step of welding end plates 21 and 21 to the laminated body on which the magnet material 26 is sealed, and the like. .. The measuring step is a step of performing a measuring method for measuring the height from the lower surface (one side surface in the axial direction) 20B of the rotor core 20 to the inner opening 36. One surface of the rotor core 20 in the axial direction is also referred to as a bottom surface of the rotor core 20.

In the method for manufacturing the rotor core 20, the measurement step may be performed after the rotor core forming step, or may be performed during the rotor core forming step. As an example of performing the measurement step in the middle of the rotor core forming step, when the measurement step is performed before the welding step of welding the end plates 21 and 21, the rod-shaped member 61 is in contact with the inner surface 35S of the refrigerant flow path 35. The position of the rod-shaped member 61 with respect to the lower surface of the rotor core main body 30 may be detected, and the position of the rod-shaped member 61 with respect to the lower surface 20B of the rotor core 20 may be indirectly detected by adding the thickness of the end plate 21. In the following description, a case where the measurement step is performed after the rotor core forming step will be specifically described.

In the rotor core forming step, a plurality of electromagnetic steel sheets 31 are punched out from the base material by using a press device to form a block 32 in which the plurality of electromagnetic steel sheets 31 are laminated. Each of the plurality of electrical steel sheets 31 constituting the block 32 of 1 is provided with a joint portion (not shown) which is a form of projecting in one direction in the stacking direction by so-called dowel processing. The electromagnetic steel sheets 31 adjacent to each other are bonded to each other by being crimped due to the unevenness of the bonded portions. Further, an electromagnetic steel sheet 31 having no joint portion is arranged at one end of the block 32 in the stacking direction. Therefore, the electrical steel sheet 31 on one end side of the block 32 is not coupled to the electrical steel sheet 31 adjacent to one end side of the block 32. The press device forms blocks 32 laminated to a predetermined height by controlling the control device to punch out the electromagnetic steel sheets 31 having no joints for each predetermined number of electromagnetic steel sheets 31.

In the rotor core forming step, a plurality of blocks 32 are laminated to form a block laminated body. When stacking a plurality of blocks 32, in order to improve the dimensional accuracy of the stacking height of the rotor core 20, the blocks 32 may be rotated by a predetermined angle and laminated, so-called transloading may be performed. The block laminate is formed on the rotor core main body 30 through a sealing step and the like. The rotor core main body 30 is formed on the rotor core 20 through a welding process and the like.

The measurement step (method of measuring the height of the inner opening 36) includes a contact step of inserting the rod-shaped member 61 into the inner opening 36 and bringing the rod-shaped member 61 into contact with the inner surface 35S of the inner flow path 35A, and the rod-shaped member 61. A detection step of detecting the position of contact with the inner surface 35S of the inner flow path 35A, and a calculation step of calculating the height from the lower surface 20B of the rotor core 20 to the inner opening 36 based on the detected position of the rod-shaped member 61. , Equipped with. The measuring step further includes a pressurizing step of applying a load along the axial direction of the rotor core 20 before the contacting step. The measurement step is performed using the inspection device 50. Before the pressurizing step is performed, the base member 53 and the measuring unit 60 are located in the standby position in the inspection device 50. When the rotor core 20 is mounted on the mounting table 51, the pressurizing process is started.

In the pressurizing step, as shown in FIGS. 3A and 3B, the base member 53 moves from the standby position to the descending position, and is laminated on the rotor core 20 between the mounting table 51 and the base member 53. A load is applied along the line. In the state where the load is applied to the rotor core 20 along the laminating direction, the slight bending of the electromagnetic steel sheet 31 and the slight gap between the laminated electromagnetic steel sheets 31 are eliminated, as compared with the state in which the load is not applied. Therefore, the height of the inner opening 36 can be measured accurately. In the pressurizing step, at the same time as measuring the height of the inner opening 36, the stacking height of the rotor core 20 may be measured with a load applied to the rotor core 20.

In the contact step, as shown in FIGS. 3 (B) and 3 (C), the second member 63 is raised, and the measuring unit 60 is displaced from the standby position to the raised position. Next, as shown in FIG. 3C, the second member 63 moves in the radial direction of the shaft hole 33, and the measuring unit 60 is displaced from the ascending position to the measuring position shown in FIG. In this process, the rod-shaped member 61 is inserted into the inner opening 36, and the contact portion 61B is held in the inner flow path 35A. When the second member 63 descends from this state, as shown in FIG. 5, the first member 62 descends in accordance with the second member 63, and the contact portion 61B of the rod-shaped member 61 is on the inner surface 35S of the inner flow path 35A. Contact the lower part. The lower portion of the inner surface 35S of the inner flow path 35A is composed of the plate surface of one electrical steel sheet 31, and is a region where burrs do not occur when the electrical steel sheet 31 is punched out. On the other hand, the opening edge of the inner opening 36 is formed by combining the end faces of a plurality of electrical steel sheets 31, and is a region where burrs may occur when the electrical steel sheets 31 are punched out. In FIG. 5, a substantially triangular burr is schematically drawn on the opening edge of the inner opening 36. The rod-shaped member 61 is configured so that the protruding portion 61A does not contact the opening edge of the inner opening 36 when the contact portion 61B is in contact with the inner surface 35S of the inner flow path 35A. That is, the rod-shaped member 61 contacts only the position behind the opening edge of the inner opening 36 on the inner surface 35S of the inner flow path 35A. Even after the contact portion 61B comes into contact with the inner surface 35S of the inner flow path 35A, the second member 63 is lowered and the detection process is started.

In the detection step, as shown in FIG. 6, the rod-shaped member 61 is restricted from coming into contact with the inner surface 35S of the inner flow path 35A and the first member 62 is restricted from moving downward (one side in the axial direction), and the movement is restricted. It is detected that the second member 63 is separated from the first member 62, and the position where the rod-shaped member 61 is in contact with the inner surface 35S of the inner flow path 35A is detected. Specifically, in a state where the contact portion 61B is in contact with the inner surface 35S of the inner flow path 35A, the inner flow path 35A serves as a stopper for the first member 62, and the first member 62 is restricted from further descending. At this time, since the rotational displacement of the first member 62 with respect to the second member 63 is restricted, the first member 62 does not rotate about the contact portion 61B. Therefore, when the contact portion 61B comes into contact with the inner surface 35S of the inner flow path 35A, the position of the first member 62 is naturally determined. When the second member 63 is further lowered from this state, the second member 63 is separated from the first member 62, and the sensor 65 detects the separation of the first member 62 and the second member 63. The position where the sensor 65 detects the separation of the first member 62 and the second member 63 is detected as the position where the rod-shaped member 61 comes into contact with the inner surface 35S of the inner flow path 35A.

After the sensor 65 detects the separation of the first member 62 and the second member 63, the second member 63 starts ascending. As shown in FIG. 7, when the second member 63 rises and comes into contact with the first member 62, the sensor 65 detects the contact between the first member 62 and the second member 63. After the contact between the first member 62 and the second member 63 is detected, the measuring unit 60 retracts from the measuring position to the ascending position (see FIG. 3E). The retracted measurement unit 60 descends from the ascending position to the standby position and is accommodated in the accommodating space 52 (see FIG. 3F). As described above, a series of contact steps and detection steps are completed.

In the calculation step, from the lower surface 20B in the axial direction of the rotor core 20 to the inner opening 36 based on the position where the rod-shaped member 61 contacts the inner surface 35S of the inner flow path 35A and the position of the upper surface of the mounting table 51 recorded in advance. Calculate the height of. The calculation process can be performed by a calculation unit provided in the control device. The calculation unit acquires the position where the rod-shaped member 61 contacts the inner surface 35S of the inner flow path 35A as the position of the lower edge portion at the opening edge of the inner opening 36 in the vertical direction. Further, the calculation unit acquires the position of the upper surface of the mounting table 51 as the position of the lower surface 20B of the rotor core 20. Then, the difference value between the position where the rod-shaped member 61 contacts the inner surface 35S of the inner flow path 35A and the position of the upper surface of the mounting table 51 is calculated, and the difference value from the lower surface 20B of the rotor core 20 to the lower edge portion of the inner opening 36 is calculated. Find the height. When it is desired to obtain the height to the center of the inner opening 36 as the height of the inner opening 36, the height from the lower surface 20B of the rotor core 20 calculated as described above to the lower edge of the inner opening 36. In addition, the height from the lower edge of the inner opening 36 to the inner opening 36 can be added to obtain the height.

In the adjusting step, the height from the lower surface 20B to the inner opening 36 measured in the measuring step is fed back to the rotor core forming step to adjust the number of electrical steel sheets 31 to be laminated. For example, when the height from the lower surface 20B of the rotor core 20 to the inner opening 36 is smaller than a predetermined height, the control device is the number of electrical steel sheets 31 laminated from the lower surface 20B of the rotor core 20 to the inner opening 36. Is controlled so as to increase according to the thickness of the electromagnetic steel sheet 31. When the height from the lower surface 20B of the rotor core 20 to the inner opening 36 is larger than a predetermined height, the control device determines the number of electrical steel sheets 31 laminated from the lower surface 20B of the rotor core 20 to the inner opening 36. Control is performed so as to decrease according to the thickness of the electromagnetic steel sheet 31. With the above, the production of the rotor core 20 is completed.

Subsequently, the action and effect of this embodiment will be described. According to the method for measuring the height of the inner opening 36 in the present embodiment, the rod-shaped member 61 is brought into contact with the inner surface 35S of the inner flow path 35A, which is less affected by burrs at the opening edge of the inner opening 36, to form the rod-shaped member 61. The height of the inner opening 36 can be calculated based on the position. Therefore, the height of the inner opening 36 can be accurately measured even in the limited space in the shaft hole 33.

The reason why the height of the inner opening 36 can be accurately measured even in the limited space in the shaft hole 33 will be described more specifically. As a method for detecting the position of the opening, for example, a non-contact type detection method such as a photoelectric sensor, a laser sensor, or an image discrimination sensor can be considered. However, when a photoelectric sensor, a laser sensor, or the like is adopted, when a burr is generated on the opening edge of the inner opening 36 in the rotor core 20, the burr shields light or a laser to accurately determine the height of the inner opening 36. It may not be possible to measure. On the other hand, in the present embodiment, even if a burr is generated on the opening edge, the position where the rod-shaped member 61 comes into contact with the inner surface 35S of the inner flow path 35A is detected, so that the influence of the burr is small. Further, when the image discrimination sensor is adopted, it is difficult to secure a sufficient focal length between the lens and the inner opening 36 in the limited space in the shaft hole 33, and it is difficult to acquire a clear image. On the other hand, in the present embodiment, it is sufficient that the rod-shaped member 61 can be inserted into the inner opening 36, and there are few spatial restrictions such as the focal length between the lens and the inner opening 36.

Further, according to the present embodiment, the height of the inner opening 36 of the rotor core 20 can be measured quickly and accurately. Therefore, for example, it is possible to measure the height of the inner opening 36 for the entire number of rotor cores 20. As a result, it is possible to reliably remove the product whose inner opening 36 has a poor height as compared with the case where only a part of the rotor core 20 is sampled and inspected, and the accuracy of the height of the inner opening 36 of the rotor core 20 is improved. Be secured. Then, the shaft-side refrigerant flow path 24 and the refrigerant flow path 35 of the rotor core 20 can communicate with each other through the inner opening 36, so that the refrigerant can be reliably circulated inside the rotor core 20.

In the detection step of the present embodiment, the rod-shaped member 61 is restricted from coming into contact with the inner surface 35S of the inner flow path 35A and the first member 62 is restricted from moving downward, and the movement is restricted from the first member 62 to the second member. It is detected that the 63 is separated, and the position where the rod-shaped member 61 is in contact with the inner surface 35S of the inner flow path 35A is detected. Therefore, the position of the rod-shaped member 61 with respect to the lower surface 20B of the rotor core 20 can be detected quickly and accurately.

In the method for manufacturing the rotor core 20 in the present embodiment, the height from the lower surface 20B to the inner opening 36 measured in the measurement step is fed back to the rotor core forming step, and an adjustment step of adjusting the number of laminated electromagnetic steel sheets 31 is further performed. Be prepared. By providing such an adjustment step, it is possible to reduce the number of rotor cores 20 that are discarded because the height of the inner opening 36 is defective, and to efficiently manufacture the rotor core 20 with high dimensional accuracy.

<Other Embodiments>
The present invention is not limited to the embodiments described in the above description and drawings, and for example, the following embodiments are also included in the technical scope of the present invention.
(1) In the above embodiment, the height from the lower surface to the inner opening of the rotor core is measured, but the height from the upper surface to the inner opening of the rotor core may be measured, and the inner opening is measured from both the lower surface and the upper surface. The height to the part may be measured. Further, in the measurement step, the rotor core may be arranged so that the axial direction is different from the vertical direction.
(2) In the above embodiment, the height to the inner opening of the rotor core is measured with the load applied to the rotor core, but in the natural state where the load is not applied to the rotor core, the height to the inner opening of the rotor core is measured. You may measure.
(3) In addition to the above embodiment, the means for detecting the position where the rod-shaped member comes into contact with the inner surface of the refrigerant flow path can be appropriately changed.
(4) The adjustment step may not be provided, and only the step of determining a product in which the height of the inner opening of the rotor core is defective may be provided.
(5) The configuration of the rotor core can be changed as appropriate. The shape, number, and size of the refrigerant flow paths can be changed as appropriate.
(6) The configuration of the inspection device can be appropriately changed according to the configuration of the rotor core. The shape and size of the rod-shaped member can also be appropriately changed according to the configuration of the refrigerant flow path. For example, the inspection device may have a configuration in which only the rod-shaped member is allowed to enter the shaft hole, and a portion of the first member other than the rod-shaped member is arranged outside the shaft hole.

The above examples are for illustration purposes only and are not to be construed as limiting the invention. Although the present invention has been described with reference to typical embodiments, the language used in the description and illustration of the invention is understood to be descriptive and exemplary rather than restrictive. As described in detail here, modifications can be made within the scope of the appended claims without departing from the scope or nature of the invention in that form. Although specific structures, materials and embodiments have been referred to herein in detail of the invention, it is not intended to limit the invention to the disclosures herein, but rather the invention is claimed in the accompanying claims. It shall cover all functionally equivalent structures, methods and uses within the scope.

20 ... Rotor core 20B ... Bottom surface (one side surface in the axial direction)
23 ... Shaft 24 ... Shaft-side refrigerant flow path 31 ... Electromagnetic steel sheet 33 ... Shaft hole 33A ... Inner surface 35 ... Refrigerant flow path 35S ... Inner surface 36 ... Inner opening (opening)
61 ... Rod-shaped member 62 ... First member 63 ... Second member

Claims (3)

In a rotor core provided with a shaft hole into which a shaft is inserted and a refrigerant flow path having an opening that opens on the inner surface of the shaft hole, the height from one surface of the rotor core in the axial direction to the opening is determined. It is a measurement method to measure
A contact step of inserting a rod-shaped member into the opening and bringing the rod-shaped member into contact with the inner surface of the refrigerant flow path.
A detection step for detecting the position where the rod-shaped member comes into contact with the inner surface of the refrigerant flow path, and
A method for measuring the height of an opening, comprising a calculation step of calculating the height from the one side surface of the rotor core in the axial direction to the opening based on the detected position of the rod-shaped member. The rod-shaped member is provided on the first member, and the first member is in separably contacted with a second member moving along the axial direction of the rotor core.
In the detection step, the rod-shaped member is restricted from coming into contact with the inner surface of the refrigerant flow path and the first member is restricted from moving to one side in the axial direction, and the movement is restricted from the first member to the second member. The method for measuring the height of an opening according to claim 1, wherein the rod-shaped member detects the separation of the members and detects the position where the rod-shaped member comes into contact with the inner surface of the refrigerant flow path. A manufacturing method for manufacturing a rotor core including a shaft hole into which a shaft is inserted and a refrigerant flow path having an opening that opens on the inner surface of the shaft hole.
A rotor core forming step of laminating a plurality of electrical steel sheets to form the rotor core, and
A measuring step of measuring the height from one surface of the rotor core in the axial direction to the opening is provided.
The measurement step is
A contact step of inserting a rod-shaped member into the opening and bringing the rod-shaped member into contact with the inner surface of the refrigerant flow path.
A detection step for detecting the position where the rod-shaped member comes into contact with the inner surface of the refrigerant flow path, and
A calculation step of calculating the height from the one side surface of the rotor core in the axial direction to the opening based on the detected position of the rod-shaped member is included.
A method for manufacturing a rotor core, further comprising an adjusting step of feeding back the height from one side surface to the opening measured in the measuring step to the rotor core forming step to adjust the number of the electromagnetic steel sheets to be laminated.

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