JP6612713B2 - Assembly method of magnetized yoke - Google Patents

Description

  The present invention relates to a method for assembling a magnetized yoke.

  A plurality of permanent magnets are incorporated in the rotor (rotor) of the electric motor, but it is difficult to assemble a magnetized permanent magnet to the rotor core due to the repulsive force and attractive force of the permanent magnet accompanying the magnetic force. Therefore, the magnetic material before being magnetized is incorporated into the rotor core, and then the magnetic material is magnetized using the magnetizing yoke. Here, some magnetized yokes are formed by a laminated core in which a plurality of plate-like core members are laminated.

  Regarding a method of assembling a laminated core, Patent Document 1 discloses a rotor assembling method having a laminated core formed by laminating electromagnetic steel sheets and a permanent magnet. The rotor assembly method according to Patent Document 1 is configured to align the laminated cores using an adjusting mechanism.

JP 2005-057920 A

  When laminating the core member, it is required to align the laminated core so that the core member does not shift in the radial direction and the circumferential direction. In a method using an adjusting mechanism such as the method according to Patent Document 1, there is a possibility that a deviation occurs in the radial direction and the circumferential direction of the laminated core. Therefore, the core members cannot be stacked with high accuracy, and there is a possibility that the magnetism of the rotor core may deteriorate.

  The present invention provides a method for assembling a magnetized yoke capable of accurately laminating core members.

  The method for assembling a magnetized yoke according to the present invention includes a step of laminating a plurality of plate-like core members, and an upper end surface and a lower end surface of the laminated core formed by laminating the core members, respectively, in the laminating direction with pressing members. Inserting a first jig having a thermal expansion coefficient larger than that of the core member into an insertion hole for inserting the magnetized component provided in the laminated core, A second jig having a larger coefficient of thermal expansion than the core member is inserted into a plurality of slot portions provided around the insertion hole for inserting a coil, and the laminated core is formed using the pressing member. A step of temporarily tightening the laminated core in a state where the first jig and the second jig are inserted and temporarily tightened with the bolt, the laminated core, The temperature of the first jig and the second jig is previously set Tightening the bolt when the temperature is equal to or higher than the set first temperature, and the temperature of the laminated core, the first jig, and the second jig is equal to or lower than a predetermined second temperature. A step of removing the first jig and the second jig.

  ADVANTAGE OF THE INVENTION According to this invention, the assembly | attaching method of the magnetizing yoke which can laminate | stack a core member accurately can be provided.

3 is a flowchart showing a method of assembling a magnetized yoke according to the first embodiment. It is a figure which shows the core member concerning Embodiment 1. FIG. It is a figure which shows the lamination | stacking core concerning Embodiment 1, an upper side pressing member, and a lower side pressing member. It is a figure which shows the insertion hole jig | tool and slot part jig | tool concerning Embodiment 1. FIG. It is a figure which shows the state by which the insertion hole jig | tool and the slot part jig | tool were inserted in the lamination | stacking core, and the lamination | stacking core were temporarily tightened with the fixing bolt. It is a figure which shows a lamination | stacking core and insertion hole jig | tool when it will be in a high temperature state by heat processing. It is a figure which shows a slot part and slot part jig | tool when it becomes a high temperature state by heat processing. It is a figure which shows the state which carried out the final fastening of the laminated core with the fixing bolt. It is a figure which shows the lamination | stacking core from which the insertion hole jig | tool and the slot part jig | tool were extracted. It is a figure which shows the completed magnetization yoke.

(Embodiment 1)
Embodiments of the present invention will be described below with reference to the drawings. Note that, in each drawing, the same element is denoted by the same reference numeral, and redundant description is omitted as necessary.

  FIG. 1 is a flowchart illustrating a method of assembling a magnetized yoke according to the first embodiment. As will be described later, the magnetized yoke according to the first embodiment has a laminated core formed by laminating plate-like core members. As will be described later, the magnetizing yoke assembling method according to the present embodiment is configured such that the core members can be stacked with high accuracy.

First, a plurality of core members are laminated to form a laminated core (step S100).
FIG. 2 is a diagram illustrating the core member 10 according to the first embodiment. The core member 10 is a plate-shaped (disk-shaped) electromagnetic steel plate (silicon steel or the like) having a thickness of about 0.25 mm to 0.5 mm. The core member 10 is formed by wire cutting or laser cutting.

  In the center of the core member 10, an insertion hole 12 into which a rotor of a motor that is a magnetized component is inserted is formed. The insertion hole 12 is a circular through hole. Around the insertion hole 12, a plurality of slot portions 14 into which coils for magnetizing the magnetic material incorporated in the rotor are inserted are formed. The slot portion 14 is a rectangular through hole. The number of slot portions 14 corresponds to the number of rotor stations. In the example shown in FIG. 2, eight slot portions 14 are provided. A plurality of bolt holes 16 into which fixing bolts for fastening the laminated core are inserted are formed near the outer edge of the core member 10.

Next, the upper end surface and the lower end surface of the laminated core are respectively sandwiched in the laminating direction by pressing members (step S102).
FIG. 3 is a diagram illustrating the laminated core 20, the upper pressing member 30, and the lower pressing member 40. As described above, the laminated core 20 is formed by laminating a plurality of core members 10. And when laminating | stacking the several core member 10, the position of the insertion hole 12, the slot part 14, and the bolt hole 16 is matched as much as possible. Thereby, the laminated core 20 is provided with an insertion hole 22 into which the rotor is inserted, a slot portion 24 into which the coil is inserted, and a bolt hole 26 into which the bolt is inserted. Here, the insertion hole 22 is a circular through hole corresponding to the shape of the insertion hole 12, the slot portion 24 is a rectangular through hole corresponding to the shape of the slot portion 14, and the bolt hole 26 is the shape of the bolt hole 16. It is a circular through hole corresponding to.

  The upper pressing member 30 is a member for pressing the upper end surface 20 a of the laminated core 20. The lower pressing member 40 is a member for pressing the lower end surface 20 b of the laminated core 20. The laminated core 20 is sandwiched between the upper pressing member 30 and the lower pressing member 40.

  The upper pressing member 30 has an insertion hole 32 into which the rotor is inserted, a slot portion 34 into which the coil is inserted, and a bolt at positions corresponding to the insertion hole 22, the slot portion 24, and the bolt hole 26 of the laminated core 20. Is provided with a bolt hole 36. Similarly, the lower pressing member 40 has an insertion hole 42 into which the rotor is inserted and a slot portion into which the coil is inserted at a position corresponding to each of the insertion hole 22, the slot portion 24 and the bolt hole 26 of the laminated core 20. 44 and a bolt hole 46 into which a bolt is inserted. The insertion hole 32 is a circular through hole corresponding to the shape of the insertion hole 22, and the slot portion 34 is a rectangular through hole corresponding to the shape of the slot portion 24. Similarly, the insertion hole 42 is a circular hole corresponding to the shape of the insertion hole 22, and the slot portion 44 is a rectangular hole corresponding to the shape of the slot portion 24. The insertion hole 42, the slot portion 44, and the bolt hole 46 do not have to be through holes. The bolt hole 46 is formed with a female screw.

  When the laminated core 20 is sandwiched between the upper holding member 30 and the lower holding member 40, the insertion hole 32, the slot portion 34, and the bolt hole 36 of the upper holding member 30 are inserted into the insertion hole 22, the slot portion of the laminated core 20, respectively. 24 and bolt hole 26 are aligned. Similarly, at this time, the insertion hole 42, the slot portion 44, and the bolt hole 46 of the lower pressing member 40 are aligned with the positions of the insertion hole 22, the slot portion 24, and the bolt hole 26 of the laminated core 20, respectively.

Next, an insertion hole jig (first jig) is inserted into the insertion hole 22, a slot part jig (second jig) is inserted into the slot part 24, and the laminated core 20 is temporarily tightened with bolts. (Step S104).
FIG. 4 is a diagram illustrating the insertion hole jig 50 and the slot part jig 60 according to the first embodiment. The insertion hole jig 50 is formed in a columnar (cylindrical) shape corresponding to the shape of the insertion hole 22. The slot part jig 60 is formed in a prismatic shape corresponding to the shape of the slot part 24. Here, the insertion hole jig 50 and the slot part jig 60 are formed of a material having a higher thermal expansion coefficient than the core member 10 (laminated core 20), such as aluminum. Further, since the dimension of the insertion hole jig 50 is slightly smaller than the dimension of the insertion hole 22, the insertion hole jig 50 can be inserted into the insertion hole 22. Similarly, since the dimension of the slot part jig 60 is slightly smaller than the dimension of the slot part 24, the slot part jig 60 can be inserted into the slot part 24.

  FIG. 5 is a view showing a state in which the insertion hole jig 50 and the slot part jig 60 are inserted into the laminated core 20 and the laminated core 20 is temporarily fastened with the fixing bolts 70. The insertion hole jig 50 is inserted into the insertion hole 22 by inserting the insertion hole jig 50 into the insertion hole 32 in a state where the laminated core 20 is sandwiched between the upper pressing member 30 and the lower pressing member 40. Similarly, the slot part jig 60 is inserted into the slot part 24 by inserting the slot part jig 60 into the slot part 34 in a state where the laminated core 20 is sandwiched between the upper side pressing member 30 and the lower side pressing member 40. Is done. 4 and 5, every other slot part jig 60 is inserted into four of the eight slot parts 24.

  The fixing bolt 70 is inserted into the bolt hole 36 from the upper pressing member 30 side and is screwed into the bolt hole 36 and the bolt hole 46. At this stage, the fixing bolt 70 is only temporarily tightened. The order of insertion hole jig 50 and slot part jig 60 and temporary fastening with fixing bolt 70 is arbitrary. That is, the insertion hole jig 50 and the slot part jig 60 may be inserted before the temporary fastening with the fixing bolt 70 or after the temporary fastening.

  Next, the insertion hole jig 50 is inserted into the insertion hole 22, the slot part jig 60 is inserted into the slot part 24, and the laminated core 20 temporarily tightened with the fixing bolts 70 is put into a furnace and subjected to heat treatment. (Step S106). When the temperature of the laminated core 20 rises to a target temperature (for example, 150 ° C.) (YES in step S108), the laminated core 20 is removed from the furnace (step S110).

  FIG. 6 is a view showing the laminated core 20 and the insertion hole jig 50 when the high temperature state is obtained by the heat treatment. As shown in (a), there is a slight gap between the insertion hole 22 of the laminated core 20 and the insertion hole jig 50 before reaching a high temperature state. Since the insertion hole jig 50 has a higher coefficient of thermal expansion than the laminated core 20, the insertion hole jig 50 is positioned with respect to the insertion hole 22 of the laminated core 20 as indicated by an arrow A when it reaches a high temperature state. It expands in the radial direction (radial direction). Thereby, as shown in (b), the side wall 52 of the insertion hole jig 50 comes into contact with the inner wall 22 a of the insertion hole 22.

  FIG. 7 is a view showing the slot portion 24 and the slot portion jig 60 when they are brought to a high temperature state by the heat treatment. In FIG. 7, the horizontal direction corresponds to the circumferential direction (circumferential direction) of the laminated core 20 (core member 10), and the vertical direction corresponds to the radial direction of the laminated core 20 (core member 10). As shown in (a), there is a slight gap between the slot portion 24 and the slot portion jig 60 before the high temperature state is reached. Since the slot part jig 60 has a higher coefficient of thermal expansion than the laminated core 20, the slot part jig 60 expands with respect to the slot part 24 of the laminated core 20 when it reaches a high temperature state. Here, the slot jig 60 is dimensioned so that the gap with the circumferential direction of the slot part 24 is small and the gap with the radial direction is large. When the slot part jig 60 reaches a high temperature state, the slot part jig 60 expands in the circumferential direction and the radial direction with respect to the slot part 24 as indicated by arrows B and C. As a result, as shown in FIG. 5B, the circumferential side wall 62 of the slot part jig 60 contacts the circumferential inner wall 24 a of the slot part 24. On the other hand, the slot part jig 60 does not contact the radial inner wall 24 b of the slot part 24.

  Here, in the state shown in FIG. 6 and FIG. 7, the fixing bolt 70 is in a temporarily tightened state, and thus the plurality of core members 10 in the laminated core 20 are not “completely” fixed. Therefore, as the insertion hole jig 50 expands, the plurality of core members 10 in the laminated core 20 are aligned in the radial direction. Similarly, as the slot jig 60 expands, the plurality of core members 10 in the laminated core 20 are aligned in the circumferential direction.

Next, when the laminated core 20, the insertion hole jig 50 and the slot jig 60 are in a high temperature state (for example, 100 ° C. or higher), the laminated core 20 is finally tightened with the fixing bolt 70 (step S112).
FIG. 8 is a view showing a state in which the laminated core 20 is finally tightened with the fixing bolt 70. Here, as described above, the laminated core 20 is aligned in the radial direction and the circumferential direction by the expansion of the insertion hole jig 50 and the slot part jig 60. By tightening the fixing bolt 70 in this state, the laminated core 20 can be fixed by the upper holding member 30 and the lower holding member 40 in a state where the laminated core 20 is aligned in the radial direction and the circumferential direction. it can.

  Next, when the temperature of the laminated core 20, the insertion hole jig 50, and the slot jig 60 is reduced to room temperature (for example, 20 ° C.) (YES in step S114), as shown in FIG. 50 and the slot part jig | tool 60 are extracted (process S116). Then, as shown in FIG. 10, the coil is assembled in the slot portion 24 of the laminated core 20, the molding process, the attachment of the lid 100, the tightening of the lid fixing bolt 80, and the wiring process are performed. A base 90 is attached. In this way, the magnetized yoke 1 is completed (step S118).

  When assembling a magnetized yoke composed of the laminated core 20, when the core member 10 is laminated, for example, if accuracy is manually set by a simple bar jig, the core member 10 cannot be laminated accurately. There is a fear. Specifically, the inner diameter (insertion hole 12) and the outer diameter (outer periphery) of the plurality of core members 10 are displaced from each other, and the cylindricity and coaxiality of the laminated core 20 may be deteriorated. Further, the slot portions 14 of the plurality of core members 10 are displaced from each other in the circumferential direction, and the straightness of the slot portions 24 of the laminated core 20 may be deteriorated.

  As described above, if the core members 10 cannot be laminated with high accuracy, it is necessary to allow a clearance between the magnetized yoke and the rotor and a clearance between the magnetized yoke and the water jacket. However, if the clearance between the magnetized yoke and the rotor is increased, the magnetizing efficiency is deteriorated. Further, when the clearance between the magnetized yoke and the water jacket is increased, the cooling efficiency is deteriorated.

  Similarly, a coil to be inserted into the slot portion 24 needs to have a sufficient insertion space, and the size of the slot portion 24 with respect to the coil needs to be increased. Therefore, the space factor of the coil with respect to the slot portion 24 is deteriorated, and the accuracy of the coil arrangement in the slot portion 24 is deteriorated. Thereby, since the accuracy of alignment of the magnetic member and the coil when the rotor is inserted into the insertion hole 22 is deteriorated, the magnetization efficiency is deteriorated.

  Moreover, about the shift | offset | difference of the internal diameter and outer diameter of the lamination | stacking core 20, after the lamination | stacking of the core member 10, the precision of cylindricity and a coaxial degree can be improved by grinding an internal diameter and an outer diameter additionally. However, such additional processing leads to an increase in man-hours for manufacturing the magnetized yoke, and increases the manufacturing cost of the magnetized yoke. Further, it is extremely difficult to additionally grind the slot portion 24.

  On the other hand, in the present embodiment, as described above, the fixing bolt 70 is finally tightened in a state where the insertion hole jig 50 and the slot part jig 60 are aligned in the radial direction and the circumferential direction. Therefore, it is possible to improve the cylindricity and coaxiality of the laminated core 20 and the straightness of the slot portion 24. Therefore, the core member 10 can be accurately laminated by using the magnetizing yoke assembling method according to the present embodiment.

  As a result, there is no need to allow a clearance between the magnetized yoke and the rotor and between the magnetized yoke and the water jacket. Therefore, it is possible to improve the magnetization efficiency and the cooling efficiency. Further, since it is not necessary to provide a margin for the size of the slot portion 24 with respect to the coil, the space factor of the coil with respect to the slot portion 24 is improved, and therefore the accuracy of the arrangement of the coil in the slot portion 24 is improved. Thereby, it is possible to improve the magnetization efficiency. Furthermore, in order to improve the accuracy of the cylindricity and the coaxiality, it is not necessary to additionally grind the inner diameter and the outer diameter after the core member 10 is laminated. Therefore, it is possible to suppress the man-hours for manufacturing the magnetizing yoke and the increase in the manufacturing cost of the magnetizing yoke.

(Modification)
Note that the present invention is not limited to the above-described embodiment, and can be changed as appropriate without departing from the spirit of the present invention. For example, in the embodiment described above, the slot part jig 60 is inserted into the four slot parts 24. However, the present invention is not limited to such a configuration. The slot part jig 60 may be inserted into all the slot parts 24. Further, the slot part jig 60 may be inserted into the two opposing slot parts 24. The slot part jigs 60 are inserted into the slot parts 24 in the number and the position so that the circumferential accuracy of the laminated core 20 can be improved.

  In the above-described embodiment, the high temperature state is 100 ° C. or higher, but the configuration is not limited thereto. The “high temperature state” is a state in which the insertion hole jig 50 and the slot part jig 60 expand to reach a temperature (first temperature) or higher at which the insertion hole jig 50 and the slot part jig 60 are in contact with the laminated core 20. In the above-described embodiment, the normal temperature is 20 ° C., but is not limited to such a configuration. The normal temperature is a temperature at which the insertion hole jig 50 and the slot part jig 60 are sufficiently cooled and the thermal expansion is stopped, and the insertion hole jig 50 and the slot part jig 60 can be easily removed. (Second temperature) Further, the “target temperature” may be any temperature as long as the temperature is equal to or higher than the temperature defining the high temperature state.

  In the above-described embodiment, the fixing bolt 70 is finally tightened after the laminated core 20 is taken out of the furnace. However, the present invention is not limited to such a configuration. If the fixing bolt 70 can be finally tightened in the furnace, the fixing bolt 70 may be permanently tightened before the laminated core 20 is taken out of the furnace.

DESCRIPTION OF SYMBOLS 1 ... Magnetized yoke, 10 ... Core member, 12 ... Insertion hole, 14 ... Slot part, 16 ... Bolt hole, 20 ... Laminated core, 20a ... Upper end surface, 20b ... lower end surface, 22 ... insertion hole, 24 ... slot part, 26 ... bolt hole, 30 ... upper pressing member, 40 ... lower pressing member, 50 ... insertion Hole jig, 60 ... Slot jig, 70 ... Fixing bolt, 80 ... Cover fixing bolt, 90 ... Base, 100 ... Cover

Claims (1)

A method of assembling a magnetized yoke,
Laminating a plurality of plate-shaped core members;
Steps of sandwiching the upper end surface and the lower end surface of the laminated core formed by laminating the core members with the pressing members, respectively,
A first jig having a coefficient of thermal expansion larger than that of the core member is inserted into an insertion hole provided in the laminated core for inserting a magnetized component, and around the insertion hole of the laminated core. A second jig having a larger coefficient of thermal expansion than that of the core member is inserted into a plurality of slot portions for inserting the coil, and the laminated core is temporarily tightened with bolts using the pressing member. And a process of
Heat-treating the laminated core in a state where the first jig and the second jig are inserted and temporarily tightened with the bolt;
Tightening the bolt when the temperature of the laminated core, the first jig, and the second jig is equal to or higher than a predetermined first temperature;
When the temperature of the laminated core, the first jig, and the second jig is equal to or lower than a predetermined second temperature, the first jig and the second jig are removed. A method for assembling a magnetized yoke comprising the steps of:

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