JP2010154730A - Rotor for motor and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve reliability on a mechanical junction and an electrical junction, and to achieve a cage-type rotor for a motor by a method having high workability in a method in which a plurality of cores forming a plurality of core shaft holes at the centers of thin electromagnetic steel sheets and a plurality of core slots formed in an approximately trapezoidal shape on the circumferences of circles are laminated in specified height, end rings formed in approximately the same shape as the cores are arranged at both ends in the axial directions, shafts are penetrated into the core shaft holes at the centers of the cores, conductor bars are penetrated astride the cores and core slots for the end rings, and the end rings and conductor bars are joined. <P>SOLUTION: The cage-type rotor for the motor arranges a rotating shaft, a plurality of conductor bars disposed in a ring shape around the rotating shaft, and annular end rings including a plurality of slots connected to a plurality of conductor bars. The cage-type rotor for the motor uses the end rings including parts not opening the outer peripheral surface and parts opening the outer peripheral surfaces. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rotor of an electric motor and a method for manufacturing the same.

  Various types of rotary electric motors are being promoted in various ways to improve performance. Among these, measures for the rotor include improvement in characteristics by changing the material of the electromagnetic steel sheet and conductor bar used as the core component, improvement in the space factor of the conductor bar, and change in the core shape.

  FIG. 16 shows a configuration example of a conventional electric motor rotor. A plurality of cores 1 each having a core shaft hole 12 formed in the center of a thin electromagnetic steel sheet and a plurality of core slots 11 each having a substantially trapezoidal shape on the circumference are laminated so as to have a predetermined height. After the end ring 2 having the substantially same shape is arranged, the shaft 3 is passed through the core shaft hole 12 in the center of the core 1, and the conductor bar 4 is passed through the core slot 11 so as to straddle the core slot 11 of the core 1 and the end ring 2. Then, the end ring 2 and the conductor bar 4 are joined by various methods such as brazing to achieve electrical conduction, thereby forming a squirrel-cage rotor of the motor.

  In this configuration, the end ring 2 and the conductor bar 4 are prepared as separate parts, and the method of joining them after assembling to the laminated core 1 has been described. However, in the die casting method, the core slot 11 of the laminated core 1 is a cavity. As a method, a molten metal is poured to form the end ring 2 and the conductor bar 4 at a time.

  However, in this die cast manufacturing method, there are many application examples in which aluminum or an aluminum alloy is used as a molten metal as a material used for the end ring 2 and the conductor bar 4, but the performance by reducing the resistance of the end ring 2 and the conductor bar 4 There are very few examples of using copper or a copper alloy as a molten metal in order to aim for improvement. This is because the melting temperature of the metal is very high at around 1083 ° C. for copper compared to around 660 ° C. for aluminum. As a result, in the copper die-casting process, the yield decreases, including insufficient filling due to a temperature drop during the flow, the residual heat of the member to solve it, and the performance of the die-cast machine for filling at high speed In addition to the price of copper materials, which are more expensive than aluminum, such as the use of high heat-resistant materials for parts that come in contact with high temperatures, the depreciation cost of the equipment is also high, resulting in a significant increase in the price per unit.

  Further, when brazing is adopted for joining the end ring 2 and the conductor bar 4, in order to obtain a good joining state, a brazing material is arranged on the substantially vertical upper side and a brazed part is arranged on the substantially vertical lower side, and heating is performed. A method of performing penetration by the own weight of the brazing material melted by the above method is performed. In the brazing joining of the rotor of an electric motor where brazing points exist at both ends of the rotating shaft, the brazing material that has penetrated is first brazed on the upper end when the rotating shaft is oriented approximately vertically first. Cool until solidified, then turn the top and bottom upside down to place the brazing material on the lower end side until the previous time. It was placed and brazed for the second time to complete the joining of both ends of the rotating shaft.

  Therefore, as described in the configuration of the first electric motor rotor, many studies have been made to devise a joining method while maintaining the performance of copper as a conductor. For example, in Patent Document 1, the end surface of the conductor bar and the whole are made hollow, and the hollow portion is expanded to fix it to the end ring. In Patent Document 2, the end surface of the conductor bar protrudes from the end ring, and There is a method of abutting a roller and plastically deforming the end portion of the conductor bar and caulking the end ring. Patent Document 3 proposes a method in which a tool having a convex portion is rotated from the outside of the end ring, and the end ring and the conductor bar are joined by material melting using friction stirring.

  Various studies have also been made on a joining method for efficiently performing the brazing twice that needs to be performed at both ends. For example, in Patent Document 4, a cage rotor and a heating coil are arranged in a sealed container, and after completion of brazing on the upper end side, the entire sealed container is turned upside down. A method has been proposed in which only the cage rotor in the container is turned upside down.

Japanese Utility Model Publication No. 58-105749 JP-A-8-340664 JP 2004-236456 A JP 2004-248462 A JP 2005-261005 A

  The problem to be solved by the present invention is to laminate a plurality of cores 1 having a core shaft hole 12 in the center of a thin electromagnetic steel sheet and a plurality of core slots 11 having a substantially trapezoidal shape on the circumference so as to have a predetermined height. Then, end rings 2 having substantially the same shape as the core 1 are arranged at both ends in the axial direction, the shaft 3 is passed through the core shaft hole 12 in the center of the core 1, and the core slot 11 of the core 1 and the end ring 2 is straddled. In the method of joining the end ring 2 and the conductor bar 4 after penetrating the conductor bar 4 as described above, the reliability of mechanical joining and electrical joining is improved, the workability is improved, and the motor is manufactured at a low cost. It is to realize a cage rotor.

  The squirrel-cage rotor for an electric motor according to the present invention includes an annular shaft having a rotating shaft, a plurality of conductor bar portions arranged annularly around an axis of the rotating shaft, and a plurality of slot portions connected to the plurality of conductor bar portions. A squirrel-cage rotor for an electric motor in which an end ring is arranged, and includes a plurality of mechanical and electrical connection portions formed by pressing at positions corresponding to the plurality of conductor bars on the outer surface of the end ring. It is characterized by.

  In addition, the method for manufacturing a squirrel-cage rotor for an electric motor according to the present invention includes a rotary shaft, a conductor bar portion arranged annularly around an axis of the rotary shaft, and an annular end having a slot portion connected to the conductor bar portion. A method of manufacturing a squirrel-cage rotor for an electric motor in which a ring is disposed, wherein means for pressing from an outer surface of the end ring is used to perform press molding at a position corresponding to a conductor bar on the outer surface of the end ring. A mechanical and electrical connection is formed.

  In addition, the squirrel-cage rotor for an electric motor according to the present invention includes a rotating shaft, a plurality of conductor bar portions arranged in an annular shape around the axis of the rotating shaft, and a plurality of slot portions connected to the plurality of conductor bar portions. A squirrel-cage rotor for an electric motor in which an annular end ring is disposed, and an end ring having a portion that does not open the outer peripheral surface and a portion that opens a part of the outer peripheral surface is used. It is characterized by comprising a conductor bar and a plurality of mechanical and electrical connections.

  In the squirrel-cage rotor of the electric motor to which the present invention is applied, the connection of the conductor bar and the end ring is pressed from the direction orthogonal to the axis of the rotor shaft, and the end ring is deformed, thereby making the mechanical connection reliable. Improves. In order to realize this, since it is not necessary to add a new shape to the part, it is possible to prevent an increase in price from the conventional part. In addition, by attaching brazing material (silver brazing, phosphoric copper brazing, etc.) to the deformed end ring and the end face of the conductor bar, or the gap formed by plastic deformation, the end ring is heated to a predetermined melting temperature. And the electrical continuity of the conductor bar is strengthened and stable performance is obtained.

  In addition, since the outer peripheral surface of part of the end ring is open, it is possible to ensure penetration of the brazing filler metal at the upper and lower ends without performing reversing operation during brazing, and work time can be reduced by simultaneous heating of the upper and lower ends. Become. In addition, since a part of the outer peripheral surface of the end ring is open, it is easy to check the brazing material penetration state at the end of processing.

It is explanatory drawing of the motor rotor manufacturing method of 1st Example. It is explanatory drawing of the motor rotor manufacturing method of 1st Example. It is an external view of the electric motor rotor of a 1st Example. It is explanatory drawing of the electric motor rotor manufacturing method of a 2nd Example, and the external view of an electric motor rotor. It is explanatory drawing of the motor rotor manufacturing method of 3rd Example. It is an external view of the electric motor rotor of a 3rd Example. It is explanatory drawing of the motor rotor manufacturing method of a 4th Example. It is an external view of the electric motor rotor of a 4th Example. It is explanatory drawing of the motor rotor manufacturing method of 5th Example. It is explanatory drawing of the motor rotor manufacturing method of a 6th Example. It is an external view of the electric motor rotor of a 6th Example. It is explanatory drawing of the motor rotor manufacturing method of a 7th Example. It is explanatory drawing of the motor rotor manufacturing method of an 8th Example. It is explanatory drawing of the motor rotor manufacturing method of a 9th Example. It is explanatory drawing of the electric motor rotor manufacturing method of a 10th Example. It is explanatory drawing of the conventional motor rotor. It is an external view of the electric motor rotor of an 11th Example. It is an external appearance and explanatory drawing of the electric motor rotor of an 11th Example. It is an external view of the electric motor rotor of an 11th Example. It is explanatory drawing of the electric motor rotor manufacturing method of 11th Example, and the external view of an electric motor rotor. It is explanatory drawing of the motor rotor manufacturing method of 11th Example. It is explanatory drawing of the motor rotor manufacturing method of 11th Example. It is an external view of the motor rotor of 12th Example. It is an external view of the motor rotor of 12th Example. It is explanatory drawing of the electric motor rotor of 12th Example. It is an external view of the motor rotor of 12th Example. It is explanatory drawing of the electric motor rotor of 13th Example.

The cage rotor of the electric motor to which the present invention is applied is a high-efficiency electric motor that requires the use of a copper material as a conductor, or an electric motor that requires the use of a conductor bar because the thickness of the laminated core portion is longer than the core outer diameter. It can be used for a cage rotor of various electric motors including the beginning.
The details of the present invention will be described below with reference to the drawings.

  FIG. 1 shows a first embodiment of a method for manufacturing an electric motor rotor according to the present invention. This is a view of the end faces of the end ring 2 and the conductor bar 4 from the axial direction of the shaft 3. FIG. 1A shows a state in which the pressing member 5 stands by at a distance that does not contact the outer periphery of the end ring 2 disposed at both ends of the stacked cores 1 in the axial direction.

  The end faces of the conductor bars 4 are arranged so as to roughly match the end faces of the end rings 2 arranged at both ends in the axial direction of the laminated cores 1 and not in contact with the core 1. The width of the pressing member 5 is approximately equal to or greater than the width of the end ring 2, and the axial direction position of the shaft 3 of the pressing member 5 is a position that does not contact the end surface extension surface of the laminated core 1.

  From these positional relationships, the pressing member moving mechanism (not shown) moves the pressing member 5 toward the outer periphery of the end ring 2, as shown in FIG. By moving even after the contact, the thin-walled portion 22 that is thin due to the hole through which the conductor bar 4 passes is deformed near the outer peripheral surface of the end ring 2.

  Due to this deformation, the gap between the thin portion 22 of the end ring 2 and the conductor bar 4 is reduced, and the movement of the pressing member moving mechanism (not shown) continues even after the gap is eliminated, so that the thin portion 22 of the end ring 2 alone or the end Since the thin portion 22 of the ring 2 and the conductor bar 4 are plastically deformed with each other, the connection between the end ring 2 and the conductor bar 4 becomes strong and stable.

  2A shows a standby state, FIG. 2B shows a state in which a connection portion 23 is formed, and FIG. 2C shows a state in which a brazing material 24 is added. The end position of the movement of the pressing member moving mechanism in FIG. 2 (b) is detected by detecting the amount of movement and the generated force and ending with a set value. As shown in FIG. 2 (b), the end ring 2 and the conductor bar 4 are electrically connected in this state. As shown in FIG. 2 (c), a brazing material (silver brazing, phosphoric copper brazing, etc.) is adhered to the end faces of the end ring 2 and the conductor bar 4 and the gaps formed by plastic deformation. By heating to the material melting temperature, the electrical continuity between the end ring 2 and the conductor bar 4 is further strengthened and stable performance is obtained.

  FIG. 3 shows an external view of the motor rotor according to the first embodiment of the present invention. 3A is a front view, and FIG. 3B is a perspective view. A plurality of mechanical and electrical connection portions 23 are formed at positions corresponding to the plurality of conductor bars 4 of the end ring 2 by pressing.

  FIG. 4 shows a second embodiment of the motor rotor structure according to the present invention. In this configuration, the end ring 2 has a laminated structure in which a plurality of thin plates are laminated in the axial direction of the rotary shaft. Depending on the thickness of the end ring 2, a method of cutting from a raw material such as cutting or wire cutting is required, which causes an increase in the part price.

  Therefore, the laminated structure shown in FIG. 4A is obtained by reducing the thickness only while keeping the specifications other than the thickness of the end ring 2 in the required shape, and stacking it to the required thickness. . As a result, press working can be used, and the part price can be reduced. Since the thickness of the pressing member 5 is approximately equal to or greater than the thickness of the end ring 2, the ability to deform the thin portion 22 of the end ring 2 by the pressing member 5 even when the end ring 2 has a laminated structure. It will not interfere.

  As shown in FIG. 4B, the mechanical and electrical connection portions 23 are formed by pressing at a plurality of positions corresponding to the plurality of conductor bars 4 on the outer surface of the plurality of thin plates of the end ring 2. Is formed.

  FIG. 5 shows a third embodiment of the method for manufacturing an electric motor rotor according to the present invention. This is a position explanatory view of the end face of the conductor bar 4 from the end face of the end ring 2 as seen from the direction orthogonal to the axis of the shaft 3. In the first and second embodiments, the end faces of the conductor bars 4 are arranged so as to roughly match the end faces of the end rings 2 arranged at both ends in the axial direction of the laminated cores 1 and not in contact with the core 1. .

  However, when it is necessary to perform processing with the end of the conductor bar 4 being held, as shown in FIG. 5 (a), the conductor bar 4 end face is disposed with a protruding length L1 from the end ring 2 end face. It doesn't matter. By setting the protrusion length L1 at this time to be approximately ½ or less of the thickness of the end ring 2, it is possible to reduce the amount of cutting at the end face processing of the end ring 2.

  Further, when the brazing material is filled in the end faces of the end ring 2 and the conductor bar 4 or the gaps formed by plastic deformation, a receiving tray portion for filling a larger amount of brazing material or a molten brazing material reservoir portion. In order to stabilize the brazing material joining, the conductor bar 4 may be disposed with a subsidence length L2 from the end face of the end ring 2 as shown in FIG. 5B. . The sinking length L2 at this time is approximately half or less of the thickness of the end ring 2 so that the brazing material can be filled without reducing the fastening force between the end ring 2 and the conductor bar 4. It is possible to function as a portion or a pooled portion of molten brazing material.

  Other functions of the pressing member 5 are the same as those in the first and second embodiments. In addition, the positional relationship between the end surface of the end ring 2 and the end surface of the conductor bar 4 may be the same positional relationship disposed at both ends in the axial direction in one motor rotor, or may be combined with each other. I do not care.

  6 (a) and 6 (b) show an electric motor rotor arranged with a protruding length L1 from the end face of the end ring 2 at the end face of the conductor bar 4, and a settling length L2 from the end face of the end ring 2 at the end face of the conductor bar 4. The perspective view of the motor rotor which was made is shown. 6A and 6B show an example in which the end ring 2 has a laminated structure in which a plurality of thin plates are laminated in the axial direction of the rotating shaft. A single end ring 2 can also be used.

  FIG. 7 shows a fourth embodiment of the motor rotor structure according to the present invention. This is a view showing the structure of the end ring 2. In the first embodiment, since the outer periphery of the end ring 2 has a uniform radius, the pressing member 5 is brought into contact with and pressed against the thin portion 22 of the end ring 2 by a pressing member moving mechanism (not shown). Thus, the thin portion 22 was deformed. As a result, the outer periphery of the end ring 2 has a non-circular shape having alternately a radius before deformation and a concave shape after deformation.

  When this non-circular shape affects the rotational performance and appearance of the motor, as shown in FIG. 7 (a), the depth at which the outer periphery of the end ring 2 becomes a concave shape due to the deformation of the thin wall portion in advance is set. The shape of the portion of the pressing member 5 that contacts the thin portion 22 of the end ring 2 is made the same as the outer peripheral radius of the end ring 2 so that the pressing member 5 is moved by the pressing member moving mechanism (not shown) to the end ring. Even when the two thin-walled portions 22 are brought into contact with and pressed, the outer diameter of the two thin-walled portions 22 can be a shape having substantially the same radius as the outer periphery of the end ring 2 as shown in FIG. In the case where the outer periphery of the initial shape of the end ring 2 is a non-circular shape, it is possible to slightly suppress an increase in the unit price of the parts by press working using a mold.

  FIG. 8 shows an external view of a motor rotor according to a fourth embodiment of the present invention. 8A is a front view, and FIG. 8B is a perspective view. A plurality of mechanical and electrical connection portions 23 are formed at positions corresponding to the plurality of conductor bars 4 of the end ring 2 by pressing, and the outer diameter thereof is a circle having the same radius as the outer periphery of the end ring 2. It is formed into a shape.

  FIG. 9 shows a fifth embodiment of the method for manufacturing an electric motor rotor according to the present invention. In the first embodiment, the shape of the portion in contact with the thin portion 22 of the end ring 2 at the tip of the pressing member 5 is obtained by dividing the outer diameter of the end ring 2 into the width of the pressing member 5 and from the center of the end ring 2. It was reversed. However, this shape is not limited to this.

  For example, as shown in FIG. 9 (a), an arc shape having a radius of approximately 1/2 of the width of the pressing member 5 or a flat portion at the center of the pressing member 5 as shown in FIG. There are two points where the both ends of the member 5 are in a rectangular shape with corners R with a radius smaller than ½ of the width of the pressing member 5 and where the thin ring portion 22 of the end ring 2 contacts as shown in FIG. A knurled shape in which there are three or more points that come into contact with the thin portion 22 of the end ring 2 as shown in FIG. In any case, any shape may be applied as long as the thin portion 22 of the end ring 2 is deformed and the connection between the end ring 2 and the conductor bar 4 is strong and stable.

  FIG. 10 shows a sixth embodiment of the method for manufacturing an electric motor rotor according to the present invention. In the embodiment described so far, the center of the pressing member 5 is disposed almost directly above the conductor bar 4 and the thin portion 22 of the end ring 2. However, the present invention is not limited to this position. As shown in FIG. 10, the conductor bar 4 and the portion directly above the thin portion 22 of the end ring 2 and the center of the pressing member 5 may be separated by a predetermined angle θ °. The predetermined angle θ ° at this time is approximately ½ of the center-to-center angle between the conductor bars 4, so that the balance on the circumference of the end ring 2 and the common use of the pressing member 5 are possible.

  In this case, the shape of the pressing member 5 needs to be deformed at the same time at the minimum two places, which are the combination of the conductor bar 4 and the thin portion 22 of the end ring 2, and therefore the two-crest shape shown in FIG. It is done. Also in this case, any shape may be applied as long as the thin portion 22 of the end ring 2 is deformed and the connection between the end ring 2 and the conductor bar 4 is strong and stable.

  FIG. 11 shows an external view of an electric motor rotor according to a sixth embodiment of the present invention. 11A is a front view, and FIG. 11B is a perspective view. A plurality of mechanical and electrical connection portions 23 are formed at positions corresponding to the conductor bars 4 of the end ring 2 by pressing.

  FIG. 12 shows a seventh embodiment of the motor rotor manufacturing method according to the present invention. FIG. 12 shows the shape of the pressing member 5 as viewed from the direction orthogonal to the axis of the shaft 3. As shown in FIG. 12 (a), a two-crest shape having two points in contact with the thin portion 22 of the end ring 2 or a portion in contact with the thin portion 22 of the end ring 2 as shown in FIG. 12 (b). Is a knurled shape with three or more points, a shape inclined with respect to the tip in the axial direction of the shaft 3 as shown in FIG. 12C, and FIG. 12C as shown in FIG. Conversely, a shape that is inclined opposite to the tip of the shaft 3 in the axial direction is conceivable. These shapes are for controlling the action point and tendency of the fastening force with respect to the axial direction of the shaft 3, and the degree of freedom in design is improved.

  Moreover, the shape which combined the shape of (a)-(d) of FIG. 9 and the shape of (a)-(d) of FIG. 12 may be sufficient. In any case, any shape may be applied to the shape of the pressing member 5 as long as the thin portion 22 of the end ring 2 is deformed and the connection between the end ring 2 and the conductor bar 4 is strong and stable.

  FIG. 13 shows an eighth embodiment of the motor rotor structure according to the present invention. This is a view showing the structure of the conductor bar 4. The shape of the conductor bar 4 in the examples so far was a bar shape having the same cross-sectional shape with respect to the axial direction of the conductor bar 4 as shown in FIG. However, in order to increase the fastening force in the axial direction between the conductor bar 4 and the end ring 2, a uniform recess 41 is formed in the vicinity of the end of the conductor bar 4 as shown in FIG. As shown in c), a corrugated recess 41 is formed in the vicinity of the end of the conductor bar 4. As a result, the conductor bar 4 and the end ring 2 act as a retaining in the axial direction, and the fastening force is increased.

  FIG. 14 shows a ninth embodiment of the motor rotor structure according to the present invention. This is a view showing the shapes of the conductor bar 4 and the core slot 11 of the end ring 2. In the embodiments so far, the shape of the conductor bar 4 and the core slot 11 of the end ring 2 that are substantially wedge-shaped is substantially the same as the angle between the wedge shapes sandwiched by radial surfaces as shown in FIG. Met.

  However, although the shapes of the conductor bar 4 and the core slot 11 of the end ring 2 that are substantially wedge-shaped vary depending on the variations in processing accuracy, the end portions of the end ring 2 and the conductor bar 4 and gap portions formed by plastic deformation. It is possible to use it for weight balance control when filling a brazing filler metal.

  Here, an angle between the radial surfaces in the wedge shape of the core slot 11 of the end ring 2 is α, and an angle between the radial surfaces in the wedge shape of the conductor bar 4 is β. did. When more brazing material is filled on the side closer to the axis of the rotor shaft, α <β is selected as shown in FIG. 14A, and more brazing material is placed on the side farther from the axis of the rotor shaft. In the case of filling, it is possible to fill the brazing material at a desired position by selecting α> β as shown in FIG.

  At this time, the shape is selected so that the difference between the narrow angle of the conductor bar, which is an approximate wedge shape, and the narrow angle of the slot of the end ring, which is an approximate wedge shape, is between + 2 ° and -2 °, or the processing accuracy varies By suppressing, it can be used for weight balance control while keeping the state of filling of the brazing material good.

  FIG. 15 shows a tenth embodiment of the motor rotor structure according to the present invention. This is a view showing the positional relationship between the conductor bar 4 and the axis of the rotor shaft of the core slot 11 of the end ring 2. With respect to a method in which a brazing filler metal is filled and bonded between a conductor bar and an end ring, a standard interval that provides an appropriate joint strength is known depending on the type of base material and the type of brazing filler metal. When the base material is copper, it is 0.05 to 0.38 mm for silver brazing and 0.05 to 0.25 mm for phosphor copper brazing.

  The conductor bar 4 and the core slot 11 of the end ring 2 that are generally wedge-shaped in the embodiments so far have substantially the same angle between the wedge-shaped radial surfaces as shown in FIG. Therefore, the thin bar 22 of the end ring 2 is deformed by the pressing member 5 to bring the conductor bar 4 close to the axis of the rotor shaft. When the distance between the bottom of the conductor bar 4 near the rotor shaft after this approach and the bottom of the core slot 11 of the end ring 2 near the rotor shaft is d, 0.0 to 0.4 mm, The brazing material is attached to the end surfaces of the end ring 2 and the conductor bar 4 and the gap formed by plastic deformation, and heated to a predetermined brazing material melting temperature, so that the brazing material is wrapped around the entire circumference of the conductor bar 4. Thus, the thickness of the filled brazing material can be made smaller than a predetermined thickness of 0.4 mm, and the electrical continuity between the end ring 2 and the conductor bar 4 is further strengthened and stable performance is obtained.

  FIG. 17 shows an eleventh embodiment of the electric motor rotor according to the present invention. This is a view seen from a direction orthogonal to the axis of the shaft 3. A plurality of end rings 2 are arranged at both axial ends of a plurality of stacked cores 1 with respect to the shaft 3, and penetrate through a core slot 11 (not shown) of the core 1 and an end ring slot 21 (not shown) of the end ring 2. In this state, the conductor bar 4 is assembled. An open portion 26 is formed on a part of the outer peripheral surface of at least one end ring 2 close to the core 1 in the plurality of end rings 2.

  The end ring 2 has a laminated structure in which a plurality of thin plates are laminated in the axial direction of the shaft 3. When the thickness of the end ring 2 is large, a method of cutting from a raw material such as cutting or wire cutting is required, which causes an increase in the part price. Therefore, the laminated structure shown in FIG. 17 is obtained by reducing the thickness only while keeping the specifications other than the thickness of the end ring 2 in the required shape, and stacking it to the required thickness. As a result, press working can be used, and the part price can be reduced.

  FIG. 18A shows a perspective view of FIG. 17, and FIG. 18B shows an explanatory diagram in which some parts of FIG. 17 are not displayed. Here, only one end side of the plurality of end rings 2 arranged at both ends in the axial direction of the shaft 3 of the plurality of stacked cores 1 is shown, and the opposite side is omitted.

  In FIG. 18A, the open portion 26 is formed on a part of the outer peripheral surface of at least one end ring 2 close to the core 1 in the plurality of end rings 2. It can be seen that the outer peripheral surface is exposed. 18B, from the state of FIG. 18A, an opening 26 is formed on a part of the outer peripheral surface of at least one end ring 2 adjacent to the core 1 in the plurality of end rings 2. The end ring 2 having no open portion on the outer peripheral surface and the conductor bar 4 are not displayed. In this figure, it can be seen that the end ring 2 has substantially the same shape as the core 1 and an open portion 26 is formed on the outer peripheral surface.

  19 (a) is a view as seen from the axial direction of the shaft 3, and FIG. 19 (b) is a view as seen from a direction perpendicular to the axial line of the shaft 3, with respect to the state of FIG. 18 (b). is there.

  As shown in FIG. 20A, the thickness of the pressing member 5 is such that the opening 26 is formed on a part of the outer peripheral surface of at least one end ring 2 close to the core 1 in the plurality of end rings 2. Therefore, even if the end ring 2 has a laminated structure, even if the end ring 2 has a laminated structure, the thin end ring 2 by the pressing member 5 is formed. It does not interfere with the ability to deform the portion 22.

  As shown in FIG. 20B, the mechanical and electrical connection portions 23 are formed by pressing at a plurality of positions corresponding to the plurality of conductor bars 4 on the outer surface of the plurality of thin plates of the end ring 2. Is formed.

  FIG. 21 is an explanatory diagram of the process of melting the brazing material, and shows an arrangement state before the melting of the brazing material. The state in which the brazing material 24 (silver brazing, phosphoric copper brazing, etc.) is adhered to the end faces of the end ring 2 and the conductor bar 4 in FIG. It is the figure seen from the orthogonal direction. At this time, the brazing material 24 is applied to the end ring 2 on the end ring 2 side that is positioned vertically upward (upward in the drawing), in which the open portion 26 is not formed on a part of the outer peripheral surface that is not close to the core 1. 2 and the end face of the conductor bar 4. Further, on the side of the end ring 2 that is positioned vertically downward (downward in the drawing), the open portion 26 of the end ring 2 that is close to the core 1 and has an open portion 26 formed on a part of the outer peripheral surface, and the side surface of the conductor bar 4 And Further, a heating coil 6 used for melting the brazing material is positioned vertically above and vertically below the end ring 2 and core 1 assembly to which the brazing material 24 is applied. Two sets are arranged at intervals corresponding to the end ring 2 side.

  FIG. 22 is an explanatory diagram of the process of melting the brazing material, and shows the arrangement state at the start of the melting of the brazing material. The assembly of the end ring 2 and the core 1 to which the brazing material 24 is applied is moved from the arrangement before melting the brazing material in FIG. 21 by a vertical slide mechanism (not shown), and the heating coil 6 used for melting the brazing material is moved vertically upward. The two portions arranged at intervals corresponding to the end ring 2 side located at the end and the end ring 2 side located vertically below are stopped at an optimum position for melting the brazing filler metal. Here, for example, two sets of heating coils 6 are simultaneously applied with, for example, a high-frequency current and heated to a predetermined brazing material melting temperature, so that the process time can be reduced without turning the assembly of the end ring 2 and the core 1 upside down. The electrical conduction between the end ring 2 and the conductor bar 4 is further strengthened, and a stable performance can be obtained.

  Here, the effect of the application position of the brazing material 24 described in FIG. 21 will be described. The application position of the brazing material 24 on the end ring 2 side located vertically above (the upper side in the drawing) is the end ring 2 and the conductor in which the open portion 26 is not formed on a part of the outer peripheral surface not close to the core 1. By using the end surface of the bar 4, the molten brazing material 24 is transmitted along the side surface of the conductor bar 4 and the inner surface of the end ring slot 21, and the open portion 26 is not formed on a part of the outer peripheral surface that is not close to the core 1. Through the plurality of end rings 2, it reaches the open portion 26 of the end ring 2 that is close to the core 1 and has an open portion 26 formed on a part of the outer peripheral surface.

  As a result, if it can be confirmed that the brazing material 24 has reached the side surface of the conductor bar 4 visible from the open portion 26, the open portion 26 is formed on a part of the outer peripheral surface not close to the core 1 located on the upper side. It can be determined that even the end ring 2 that is not formed is securely joined.

  At the same time, if it can be confirmed that the brazing material 24 has reached the side surface of the conductor bar 4 arranged on the circumference of the shaft 3 to the same extent, it is opened to a part of the outer peripheral surface not close to the core 1. The uniformity of the brazing material 24 applied to the end rings 2 and the end surfaces of the conductor bars 4 where the portions 26 are not formed can be confirmed. If a non-uniform state can be confirmed in the brazing material 24 on the side surface of the conductor bar 4 arranged on the circumference of the shaft 3, the cause of non-uniform coating amount and the non-uniform heating state can be estimated. Countermeasures are possible.

  Also, the application position of the brazing filler metal 24 on the side of the end ring 2 that is located vertically downward (downward in the drawing) is the opening of the end ring 2 that is close to the core 1 and has an open portion 26 formed on a part of the outer peripheral surface. By forming the portion 26 and the side surface of the conductor bar 4, the molten brazing material 24 travels along the side surface of the conductor bar 4 and the inner surface of the end ring slot 21, and the open portion 26 is formed on a part of the outer peripheral surface not close to the core 1. It reaches the end face of the end ring 2 that is positioned vertically downward (downward in the drawing) via a plurality of end rings 2 that are not formed.

  As a result, if it can be confirmed that the brazing filler metal 24 has reached the vicinity of the end face of the conductor bar 4 that can be seen from the end face of the end ring 2, the open portion 26 is close to the core 1 located on the upper side and part of the outer peripheral face. It can be determined that even the end ring 2 that is not formed is securely joined.

  At the same time, if it can be confirmed that the brazing material 24 has reached the vicinity of the end face of the conductor bar 4 arranged on the circumference of the shaft 3 to the same extent, it is close to the core 1 and opened to a part of the outer peripheral face. The uniformity of the brazing material 24 applied to the side surfaces of the end ring 2 and the conductor bar 4 where the portions 26 are formed can be confirmed.

  If a non-uniform state can be confirmed in the brazing filler metal 24 near the end face of the conductor bar 4 arranged on the circumference of the shaft 3, the cause of non-uniform coating amount and the non-uniform heating state can be estimated immediately. Measures can be taken.

  In the process description shown in FIGS. 21 to 22, the heating coil 6 is disposed vertically upward, but the heating coil 6 may be disposed vertically downward. Further, the position setting in the vertical direction has been described for the assembly of the heating coil 6, the end ring 2 and the core 1 coated with the brazing material 24, but the melting of the brazing material 24 is uniform on the circumference of the end ring 2. In order to achieve this, the assembly of the end ring 2 and the core 1 may be rotated about the axial direction center of the shaft 3. Also, for example, two sets of high-frequency currents are simultaneously applied to the heating coils 6 positioned above and below to heat to a predetermined brazing material melting temperature, but current is sequentially applied to the two sets of heating coils 6. Therefore, the power supply capacity may be reduced by half and the equipment price may be reduced.

  FIG. 23 shows a twelfth embodiment of the electric motor rotor according to the present invention. This is a view seen from a direction orthogonal to the axis of the shaft 3. End rings 2 are arranged at both axial ends of a plurality of stacked cores 1 with respect to the shaft 3 so as to pass through a core slot 11 (not shown) of the core 1 and an end ring slot 21 (not shown) of the end ring 2. The conductor bar 4 is assembled. An open portion 26 is formed on a part of the outer peripheral surface of the end ring 2 near the core 1 of the end ring 2.

  When the thickness of the end ring 2 is large, a method of cutting from a material such as cutting or wire cutting is required. However, since there is no dividing surface in the axial direction of the shaft 3 with respect to the method of laminating, it is possible to prevent material intrusion based on the dividing surface, and this structure becomes necessary when priority is given to this function.

  FIG. 24 is a perspective view of FIG. Here, only one end side of the end ring 2 arranged at both ends in the axial direction of the shaft 3 of the stacked cores 1 is shown, and the opposite side is omitted. In FIG. 24, the conductor bar 4 is exposed to the outer peripheral surface by forming the open portion 26 in a part of the outer peripheral surface of the end ring 2 near the core 1 of the end ring 2. Recognize.

  FIG. 25 is an explanatory diagram of the end ring 2 of FIG. FIG. 25A is a view seen from the axial direction of the shaft 3 (not shown), and FIG. 25B is a view seen from the direction orthogonal to the axial line of the shaft 3 not shown.

  In FIG. 26, the external view of the motor rotor of the 12th Example of this invention is shown. FIG. 26A is a front view and FIG. 26B is a perspective view. A plurality of mechanical and electrical connection portions 23 are formed at positions corresponding to the plurality of conductor bars 4 of the end ring 2 by pressing.

  As shown in (b) of FIG. 26, the mechanical and electrical connection portion 23 is formed by pressing at a plurality of positions corresponding to the plurality of conductor bars 4 on the outer surface of the end ring 2.

  FIG. 27 shows a thirteenth embodiment of the motor rotor according to the present invention. This is an explanatory view of the shape of the open portion 26 formed on a part of the outer peripheral surface of the end ring 2. As shown in FIGS. 18 and 3 in the first embodiment and FIG. 25 in the second embodiment, the shape of the opening 26 is formed so that the outer diameter decreases from the outer peripheral surface of the end ring 2 toward the center. It was.

  The shape of the opening 26 formed on a part of the outer peripheral surface of the end ring 2 is not limited to the above. As shown in FIG. 27A, as a path connected from the slot 21 of the end ring 2 to the outer peripheral surface of the end ring 2, the width on the slot 21 side and the width on the outer peripheral surface side of the end ring 2 may be substantially the same. As shown in FIG. 27 (b), the width on the slot 21 side may be smaller than the width on the outer peripheral surface side of the end ring 2 as a path leading from the slot 21 of the end ring 2 to the outer peripheral surface of the end ring 2. As shown in FIG. 27C, the width on the slot 21 side may be larger than the width on the outer peripheral surface side of the end ring 2 as a path connecting from the slot 21 of the end ring 2 to the outer peripheral surface of the end ring 2.

  Regardless of the shape, the object of the present invention is to create a path that leads to the conductor bar 4 from the open portion 26 formed on a part of the outer peripheral surface of the end ring 2, so that the quality confirmation and the upside down mechanism at the time of melting the brazing material can be achieved. It is to perform the brazing material joining of the upper and lower ends efficiently without the need.

  Also, in Examples 12 and 13, when the end rings 2 are arranged at both axial ends of a plurality of laminated cores 1 with respect to the shaft 3, the same structure is used. The end ring 2 on the vertically upper side may be combined with a part in which the open part 26 is not formed on a part of the outer peripheral surface, or may be combined with the structure of the first and second embodiments. In Examples 12 and 13, although press molding is used for fixing the end ring 2 and the conductor bar 4, there is no particular limitation.

DESCRIPTION OF SYMBOLS 1 Core 2 End ring 3 Shaft 4 Conductor bar 5 Press member 6 Heating coil 11 Core slot 12 Core shaft hole 21 End ring slot 22 Thin part 23 Connection part 24 Brazing material 26 Opening part 41 Recessed part

Claims (18)

  A squirrel-cage rotor for an electric motor having a rotating shaft, a plurality of conductor bar portions arranged annularly around the axis of the rotating shaft, and an annular end ring having a plurality of slot portions connected to the plurality of conductor bar portions A cage for an electric motor comprising a plurality of mechanical and electrical connection portions formed by pressing at positions corresponding to the plurality of conductor bars on the outer surface of the end ring. Rotor. The squirrel-cage rotor for an electric motor according to claim 1,
Filling the conductive bar portions of the plurality of mechanical and electrical connection portions with a plurality of slots between the plurality of slot portions of the end ring to further increase the electrical continuity of the plurality of mechanical and electrical connection portions. A squirrel-cage rotor for electric motors characterized by strengthening. The squirrel-cage rotor for an electric motor according to claim 1,
The end ring has a structure in which a plurality of thin plates are laminated in the axial direction of the rotating shaft, and the mechanical and electrical connection portions are located at positions corresponding to the plurality of conductor bars on the outer surface of the plurality of thin plates. 2. A squirrel-cage rotor for an electric motor according to claim 1, wherein the squirrel-cage rotor is formed by pressing. The squirrel-cage rotor for an electric motor according to claim 1,
Arranged between a state in which the end face position of the conductor bar portion protrudes from the end face position of the end ring within a half of the end ring thickness to a state where the end face sinks within a half of the end ring thickness. A squirrel-cage rotor for an electric motor characterized by the above. The squirrel-cage rotor for an electric motor according to claim 1,
The squirrel-cage rotor for an electric motor, wherein the end ring has a substantially uniform radius after press molding. The squirrel-cage rotor for an electric motor according to claim 1,
A squirrel-cage rotor for an electric motor characterized in that a difference between a narrow angle of a conductor bar portion having a substantially wedge shape and a narrow angle of a slot of an end ring having a substantially wedge shape is between + 2 ° and -2 °. In the cage rotor for electric motors according to claim 2,
A squirrel-cage rotor for an electric motor, characterized in that a thickness of a brazing material filled between a bottom of a conductor bar portion having a substantially wedge shape and a bottom of a slot of an end ring having a substantially wedge shape is smaller than a predetermined thickness.   In the method of manufacturing a squirrel-cage rotor for an electric motor comprising a rotating shaft, a conductor bar portion arranged annularly around an axis of the rotating shaft, and an annular end ring having a slot portion connected to the conductor bar portion, A car for an electric motor, characterized in that a mechanical and electrical connection portion is formed by press molding at a position corresponding to the conductor bar on the outer surface of the end ring using means for pressing from the outer surface of the end ring. Method for manufacturing a shaped rotor. In the manufacturing method of the cage rotor for electric motors according to claim 8,
A method for manufacturing a squirrel-cage rotor for an electric motor, wherein press molding is performed using a pressing member in which a tip of the pressing member has two or more contact start points with an end ring outer periphery in a circumferential direction. In the manufacturing method of the cage rotor for electric motors according to claim 8,
The cage for an electric motor, wherein the angle formed between the center of the pressing member and the center of the conductor bar portion with respect to the radial direction is approximately half of the angle between the centers of the conductor bar portions. Method for manufacturing a shaped rotor. In the manufacturing method of the cage rotor for electric motors according to claim 8,
A method of manufacturing a squirrel-cage rotor for an electric motor, wherein press molding is performed by using a pressing member whose tip of the pressing member has two or more contact start points with the outer periphery of the end ring in the axial direction of the shaft. In the manufacturing method of the cage rotor for electric motors according to claim 8,
A concave shape is provided in the vicinity of the end portion of the conductor bar portion, and a mechanical and electrical connection portion is formed by applying pressure molding to a corresponding position of the concave shape of the conductor bar on the outer surface of the end ring. A method of manufacturing a squirrel-cage rotor for an electric motor, characterized by comprising:   A squirrel-cage rotor for an electric motor having a rotating shaft, a plurality of conductor bar portions arranged annularly around the axis of the rotating shaft, and an annular end ring having a plurality of slot portions connected to the plurality of conductor bar portions A squirrel-cage rotor for an electric motor using an end ring having a portion where the outer peripheral surface of the end ring is not opened and a portion where a part of the outer peripheral surface is opened. The squirrel cage rotor for an electric motor according to claim 13,
A squirrel-cage rotor for an electric motor, wherein a plurality of end rings are formed and used in combination with an end ring that has a portion that does not open the outer peripheral surface and a portion that opens a part of the outer peripheral surface. The squirrel cage rotor for an electric motor according to claim 13,
A cage shape for an electric motor using an end ring having an open width on the outer peripheral surface side substantially equal to an open width on the side connected to the conductor bar in a part of the outer peripheral surface of the end ring opened. Rotor. The squirrel cage rotor for an electric motor according to claim 13,
A squirrel-cage rotor for an electric motor using an end ring having an open width on an outer peripheral surface side larger than an open width on a side connected to a conductor bar at a part of the outer peripheral surface of the end ring opened. The squirrel cage rotor for an electric motor according to claim 13,
A squirrel-cage rotor for an electric motor using an end ring having an open width on the outer peripheral surface side smaller than an open width on the side connected to the conductor bar in a portion where a part of the outer peripheral surface of the end ring is opened. The squirrel cage rotor for an electric motor according to claim 13,
A squirrel-cage rotor for an electric motor comprising a plurality of mechanical and electrical connection portions formed by pressing at positions corresponding to the plurality of conductor bars on the outer surface of the end ring.

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