Static elimination method and static elimination device

Abstract

To provide a static elimination method capable of removing static electricity from an armature.SOLUTION: The static elimination method for removing static electricity from an armature includes the steps of, performing at the same time: bringing a grounded first contact part 11 into contact with a core 3 of the armature; bringing a grounded second contact part 12 into contact with a metal part 21 of a power line 10 that is electrically connected to the metal part 21 or a coil 2 of a wire constituting the coil 2 of the armature; and bringing a grounded third contact part 13 into contact with a coating 20 of multiple wires constituting one coil end 7.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a static elimination method and device for eliminating static electricity from an armature (that is, a stator or rotor) that constitutes a rotating electrical machine. [Background technology]

[0002] Conventionally, in the manufacturing process of armatures for rotating electric machines, insulation tests are performed on the coating of the wires of each phase that make up the three-phase coil of the armature and on the resin molding the wires. The insulation test method described in Patent Document 1 performs insulation tests to determine whether there are any insulation defects, such as pinholes, in the coating of the wires that make up the coil end or in the resin molding the wires that make up the coil end. Specifically, for example, in an insulation test on the coating of the wires that make up the coil end, one probe of an insulation test device is connected to an electrode, and the other probe is connected to the metal part of the wires. A voltage is applied from the insulation test device to generate a potential difference between the electrode and the metal part of the wires, causing space discharge or creeping discharge, and the amount of change in the potential difference is measured. If the potential difference change is smaller than a predetermined threshold, the product is determined to be good, and if the potential difference change is greater than the predetermined threshold, the product is determined to be poorly insulated. Space discharge or creeping discharge occurs when there are any insulation defects, such as pinholes, in the coating of the wires that make up the coil end. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-70859 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when an insulation test is performed during the armature manufacturing process, the armature may become charged due to the voltage applied during the test. Therefore, if a worker directly touches the armature immediately after the insulation test, a discharge may occur between the armature and the worker, and the worker may receive an electric shock. If the armatures are left for a period of time after the insulation test to ensure the safety of the workers, there is a concern that this will reduce the productivity of the armature.

[0005] Although static elimination methods using ionizers are generally known, experiments conducted by the inventors have shown that ionizers cannot eliminate static electricity from armature, which is a complex combination of conductors such as metal wires and cores in a coil and insulators such as coatings in a coil.

[0006] SUMMARY OF THE INVENTION In view of the above, an object of the present invention is to provide a static elimination method and a static eliminator that can eliminate static electricity from an armature. [Means for solving the problem]

[0007] In order to achieve the above object, according to the invention of claim 1, a static elimination method for eliminating static from an armature constituting a rotating electric machine comprises: bringing a grounded first contact portion (11) into contact with a core (3) of the armature; bringing a grounded second contact portion (12) into contact with a metal portion (21) of a wire constituting a coil (2) of the armature or a metal portion of a power line (10) electrically connected to the coil; At the same time, the grounded third contact portion (13) is brought into contact with the coating (20) of the multiple wires that make up the coil end (7) that protrudes from the slot (4) of the core to one side in the axial direction of the core.

[0008] This static elimination method makes it possible to prevent dielectric polarization in the coating of the wire and to eliminate static electricity from the armature, thereby improving the productivity and safety of the armature. In this specification, simultaneous contact between the core and the first contact portion, contact between the metal portion of the wire or the metal portion of the power line and the second contact portion, and contact between the coatings of multiple wires and the third contact portion means that there is a period of time during which these three contacts are occurring simultaneously, and it is not necessary for the start and end times of each of the three contacts to coincide.

[0009] According to the invention of claim 2, a method for eliminating static electricity from an armature constituting a rotating electric machine includes: bringing a grounded first contact portion (11) into contact with a core (3) of the armature; bringing a grounded second contact portion (12) into contact with a metal portion (21) of a power line electrically connected to a coil (2) of the armature; bringing a grounded third contact portion (13) into contact with coatings (20) of a plurality of wires constituting a coil end (7) of the coil that protrudes from the slot (4) of the core toward one side in the axial direction of the core; This includes simultaneously contacting the grounded fourth contact portion (14) with a resin portion (5) that molds a plurality of wires that make up the coil end (8) of the coil that protrudes from the slot of the core to the other side in the axial direction of the core.

[0010] According to this static elimination method, dielectric polarization can be prevented in the resin portion that molds the wire and in the coating of the wire, and static electricity can be eliminated from the armature. In this specification, simultaneous contact between the core and the first contact portion, contact between the metal portion of the power line and the second contact portion, contact between the coating of multiple wires and the third contact portion, and contact between the resin portion and the fourth contact portion means that there is a period of time during which these four contacts are occurring simultaneously, and it is not necessary for the start and end times of each of the four contacts to coincide.

[0011] According to the invention of claim 5, a static eliminator for eliminating static electricity from an armature constituting a rotating electric machine comprises: a first contact portion (11) capable of contacting a core (3) of the armature and being grounded; a second contact portion (12) that is grounded and that is capable of contacting a metal portion (21) of a wire constituting a coil (2) of the armature or a metal portion of a power line (10) electrically connected to the coil; a third contact portion (13) capable of contacting coatings (20) of a plurality of wires constituting a coil end (7) of the coil that protrudes from the slot of the core to one side in the axial direction of the core, and that is grounded; and a drive device (15) that operates at least one of the first contact portion, the second contact portion, the third contact portion, and the armature so as to simultaneously bring the core into contact with the first contact portion, the metal portion of the wire or the metal portion of the power line into contact with the second contact portion, and the coatings of the multiple wires into contact with the third contact portion.

[0012] According to this, the static eliminator can prevent dielectric polarization in the coating of the wire and can eliminate static electricity from the armature.

[0013] According to the invention of claim 7, a static eliminator for eliminating static electricity from an armature constituting a rotating electric machine comprises: a first contact portion (11) capable of contacting a core (3) of the armature and being grounded; a second contact portion (12) that is capable of contacting a metal portion of a power line (10) electrically connected to a coil (2) of the armature and is grounded; a third contact portion (13) capable of contacting coatings (20) of a plurality of wires constituting a coil end (7) of the coil that protrudes from the slot (4) of the core to one side in the axial direction of the core and that is grounded; a fourth contact portion (14) that is capable of coming into contact with a resin portion (5) that molds a plurality of wires that constitute a coil end (8) of the coil that protrudes from the slot of the core to the other side in the axial direction of the core, and that is grounded; and a drive device (15) that operates at least one of the first contact portion, the second contact portion, the third contact portion, the fourth contact portion, and the armature so as to simultaneously bring the core into contact with the first contact portion, the metal portion of the power line into contact with the second contact portion, the coatings of the multiple wires into contact with the third contact portion, and the resin portion into contact with the fourth contact portion.

[0014] According to this, the static eliminator can prevent dielectric polarization in the resin portion that molds the wire and in the coating of the wire, and can neutralize the armature.

[0015] The reference symbols in parentheses attached to each component indicate an example of the correspondence between the component and the specific components described in the embodiments described below. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 2 is a side view of the static eliminator and the armature according to the first embodiment. [Figure 2] 2 is a cross-sectional view taken along a line parallel to the axis of the stator in part II of FIG. 1. FIG. [Figure 3] FIG. 3 is a diagram for explaining the installation position of a sensor used in a confirmation test of static elimination by the static eliminator according to the first embodiment. [Figure 4] 4 is a graph showing the results of a confirmation test of static elimination by the static eliminator according to the first embodiment. [Figure 5] 4 is a graph showing the results of a confirmation test of static elimination by the static eliminator according to the first embodiment. [Figure 6] 10 is a graph showing the results of a confirmation test of static elimination using an ionizer as a comparative example. [Figure 7] 10 is a graph showing the results of a confirmation test of static elimination using an ionizer as a comparative example. [Figure 8] 10 is a graph showing the results of a confirmation test of static elimination using an ionizer as a comparative example. [Figure 9] 10 is a graph showing the results of a confirmation test of static elimination using an ionizer as a comparative example. [Figure 10] 3 is a cross-sectional view of a portion of the static eliminator and armature according to the second embodiment, which corresponds to FIG. 2. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0017] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, identical or equivalent parts are designated by the same reference numerals, and description thereof will be omitted.

[0018] (First embodiment) A first embodiment will be described with reference to the drawings. As shown in Fig. 1, the static elimination method and static elimination device of the first embodiment eliminates static electricity charged on a stator 1, which is an example of an armature that constitutes a rotating electric machine. The rotating electric machine is used, for example, as a motor generator mounted on an electric vehicle.

[0019] 1 and 2, the stator 1 includes an annular core 3 (i.e., a stator core), a coil 2 inserted into a slot 4 provided in the core 3, and an insulating sheet 6 provided between the inner wall of the slot 4 of the core 3 and the coil 2. The coil 2 is a three-phase coil that constitutes part of a three-phase AC circuit.

[0020] The U-, V-, and W-phase wires constituting the coil 2 are segment coils in which a coating 20 made of an insulating material such as enamel is applied to the outside of a metal portion 21. In the manufacturing process of the stator 1, these wires are bent into a substantially U-shape and inserted from one side to the other in the axial direction of the core 3. Therefore, of the multiple wires constituting the coil 2, all of the portions protruding to one side in the axial direction of the core 3 (hereinafter referred to as "coil ends 7 on one side") are covered with the coating 20. The axial direction of the core 3 is the direction in which the axial center CL of the core 3 extends.

[0021] Among the multiple wires constituting the coil 2, the ends of the portions protruding to the other side in the axial direction of the core 3 (hereinafter referred to as "other side coil end 8") are joined together by welding. In the following description, the portion where the ends exposed from the coating 20 of the multiple wires constituting the coil 2 are joined together by welding is referred to as welded portion 9. Three power lines 10 electrically connected to the wires of the U-phase, V-phase, and W-phase that make up the coil 2 protrude radially outward from the other coil end 8 of the core 3 .

[0022] In the manufacturing process of the stator 1, an insulation test is performed to check the insulation of the coating 20 of the multiple wires constituting the coil end 7 of the coil 2 that protrudes from the slots 4 of the core 3 to one side in the axial direction of the core 3 and the resin portion 5 that molds the multiple wires constituting the coil end 8 of the coil 2 that protrudes from the slots 4 of the core 3 to the other side in the axial direction of the core 3. In the insulation test, a voltage is applied so as to generate a potential difference between the electrode and the metal portion 21 of the wires constituting the coil 2 of the stator 1 or the metal portion 21 of the power line 10, causing space discharge or surface discharge, and the amount of change in the potential difference is measured. Note that the space discharge or surface discharge refers to discharge that occurs at an insulation defect location accompanied by exposed conductor, such as a pinhole, in the coating 20 of the multiple wires constituting the coil end 7 of the coil 2 that protrudes from the slots 4 of the core 3 to one side in the axial direction of the core 3 or in the resin portion 5 that molds the multiple wires constituting the coil end 8 of the coil 2 that protrudes from the slots 4 of the core 3 to the other side in the axial direction of the core 3. In the insulation test, if the amount of change in potential difference is smaller than a predetermined threshold, the stator 1 is determined to be a good product. On the other hand, if the amount of change in potential difference is larger than the predetermined threshold, the coating 20 of the multiple wires constituting the coil end 7 of the coil 2 of the stator 1 that protrudes from the slot 4 of the core 3 to one side in the axial direction of the core 3, and the resin part 5 that molds the multiple wires constituting the coil end 8 of the coil 2 that protrudes from the slot 4 of the core 3 to the other side in the axial direction of the core 3, are determined to have poor insulation.

[0023] When an insulation test is performed in the manufacturing process of the stator 1, the voltage applied during the test may cause the stator 1 to become charged. Therefore, the static elimination device and static elimination method of the first embodiment are intended to eliminate static electricity from the stator 1 that has been charged during the insulation test.

[0024] The static eliminator of the first embodiment includes a first contact portion 11, a second contact portion 12, a third contact portion 13, a drive device 15, and the like.

[0025] The first contact portion 11, the second contact portion 12, and the third contact portion 13 are all formed of a conductor, and are all grounded by an earth wire or the like (not shown).

[0026] The first contact portion 11 is capable of coming into contact with the core 3 of the stator 1. The core 3 is formed of a metal such as a laminated steel plate. The first contact portion 11 is capable of removing static electricity charged on the core 3.

[0027] The second contact portion 12 is capable of coming into contact with the metal portion 21 of the power line 10 of the stator 1. The second contact portion 12 is capable of removing static electricity from the metal portions 21 of all the wires that make up the coil 2 of the stator 1. Although not shown, the second contact portion 12 may be configured to come into contact with a welded portion 9 where ends of multiple wires that make up the coil 2 are joined by welding. In other words, the second contact portion 12 may be configured to be capable of electrically coming into contact with the metal portions 21 of the wires that make up the coil 2 of the stator 1 or the metal portions 21 of the power line 10.

[0028] The third contact portion 13 is capable of contacting the coatings 20 of the wires constituting one coil end 7. Specifically, the third contact portion 13 has a plate portion 16 formed in an annular or disc shape. The plate portion 16 is formed of a conductor. When viewed from the axial direction of the core 3, the area S1 of the plate portion 16 of the third contact portion 13 is equal to or larger than the area S2 of the region where the coatings 20 of the wires constituting one coil end 7 are arranged. When viewed from the axial direction of the core 3, the entire region where the coatings 20 of the wires constituting one coil end 7 are arranged overlaps the plate portion 16 of the third contact portion. Therefore, the plate portion 16 of the third contact portion 13 is capable of contacting the coatings 20 of almost all of the wires constituting one coil end 7. As a result, the third contact portion 13 can prevent the dielectric polarization of static electricity that has accumulated on the coating 20 of the wire that constitutes one of the coil ends 7, and can eliminate the static electricity. Note that, although it is preferable for the third contact portion 13 to come into contact with the coating 20 of all of the wire, this is not limiting, and it is also possible that the third contact portion 13 does not come into contact with the coating 20 of some of the wire due to manufacturing tolerances, etc.

[0029] The driving device 15 is a device that moves at least one of the first contact portion 11, the second contact portion 12, the third contact portion 13, and the stator 1, and brings the first contact portion 11, the second contact portion 12, and the third contact portion 13 into contact with predetermined positions on the stator 1. The driving device 15 operates at least one of the first contact portion 11, the second contact portion 12, the third contact portion 13, and the stator 1 so as to simultaneously bring the core 3 into contact with the first contact portion 11, the metal portion 21 of the power line 10 or the metal portion 21 of the wire into contact with the second contact portion 12, and the coatings 20 of the multiple wires into contact with the third contact portion 13.

[0030] 1 and 2, the driving device 15 is configured to operate the first contact portion 11 and the second contact portion 12. When the stator 1 is placed on the plate portion 16 of the third contact portion 13, the coating 20 of the multiple wires constituting one coil end 7 comes into contact with the plate portion 16 of the third contact portion 13. In this state, the driving device 15 moves the first contact portion 11 and the second contact portion 12, respectively, to bring the first contact portion 11 into contact with the core 3 and the second contact portion 12 into contact with the metal portion 21 of the power line 10 or the metal portion 21 of the wire. As a result, the core 3 comes into contact with the first contact portion 11, the metal portion 21 of the power line 10 or the metal portion 21 of the wire comes into contact with the second contact portion 12, and the coating 20 of the multiple wires comes into contact with the third contact portion 13, and these contact times overlap. Therefore, static electricity charged to each part of the stator 1 is neutralized without escaping to another part within the stator 1.

[0031] (Confirmation test) Here, a confirmation test of static elimination using the static eliminator of the first embodiment will be described with reference to FIGS.

[0032] As shown in Figure 3, the confirmation test was performed by attaching three sensors 31, 32, and 33 for measuring charged voltage to various locations on the stator 1. Specifically, the first sensor 31 was installed on the coating 20 at the location where the multiple wires constituting the other coil end 8 intersected. The second sensor 32 was installed at the welded portion 9 where the ends of the multiple wires constituting the other coil end 8 were joined. The third sensor 33 was installed on the coating 20 of the multiple wires constituting the one coil end 7. Then, a voltage was applied to the stator 1 in the same manner as in the insulation test to charge the stator 1, and then the static eliminator was used to remove the static charge.

[0033] Fig. 4 shows the stator 1 in a charged state, after which it was neutralized by a neutralization device. More specifically, the coating 20 of the multiple wires constituting one coil end 7 was positively charged, after which it was neutralized by a neutralization device. In this confirmation test, charging and neutralization were repeated multiple times.

[0034] The horizontal axis of Fig. 4 represents the number of times, and the vertical axis represents the charge voltage. In Fig. 4, the charge voltage detected by the first sensor 31 is indicated by a dashed line A, the charge voltage detected by the second sensor 32 is indicated by a dashed line B, and the charge voltage detected by the third sensor 33 is indicated by a solid line C. Note that these are the same as in Figs. 5 to 9, which will be referred to in the following explanation, except for the horizontal axis. 4, T_2, T_4, T_6, and T_8 indicate the state after the stator 1 has been charged. Meanwhile, T_3, T_5, T_7, and T_9 indicate the state after the stator 1 has been neutralized. In the stator 1 neutralized by the neutralization device of the first embodiment, the charge voltages detected by the first to third sensors 33 are all in a range in which a person would not normally feel an electric shock (for example, a range of 1 kV to -1 kV).

[0035] 5 also shows the stator 1 in a charged state, after which the static electricity was removed by a static eliminator. More specifically, in FIG. 5, the coating 20 of the multiple wires constituting one coil end 7 was negatively charged, after which the static electricity was removed by a static eliminator. In this confirmation test as well, charging and static elimination were repeated multiple times. 5, T_12, T_14, T_16, and T_18 show the state after the stator 1 has been charged. Meanwhile, T_13, T_15, T_17, and T_19 show the state after the stator 1 has been neutralized. In the stator 1 neutralized by the neutralization device of the first embodiment, the charge voltages detected by the first to third sensors 33 are all in a range in which a person would not normally feel an electric shock (for example, a range of 1 kV to -1 kV).

[0036] (Comparative Example) Next, for comparison with the static eliminator of the first embodiment described above, a confirmation test of static elimination using an ionizer as a comparative example will be described with reference to FIGS. 6 to 9. FIG.

[0037] Figure 6 also shows the case where static electricity was removed by an ionizer from a charged state of the stator 1. In detail, Figure 6 shows the case where negative ions were irradiated from the ionizer onto the coil end 7 on one side, after the coating 20 of the multiple wires that make up the coil end 7 on one side was charged to a voltage greater than +1 kV.

[0038] The horizontal axis in Fig. 6 represents time, and this also applies to Figs. 7 to 9, which will be referred to in the following explanation. T_20 in Fig. 6 shows the state after the stator 1 has been charged. Meanwhile, T_21 to T22 show the state after the stator 1 has been neutralized. As indicated by dashed line A, in the stator 1 that has been neutralized by the ionizer, the charged voltage detected by the first sensor 31 (i.e., the charged voltage of the coating 20 of the coil end 8 on the other side) becomes larger in absolute value than -1 kV over time, reaching a voltage that would cause a person to feel an electric shock.

[0039] FIG. 7 shows a state in which the coating 20 of the multiple wires constituting one coil end 7 is charged to an absolute value greater than −1 kV, and then positive and negative ions are irradiated from an ionizer onto both the one coil end 7 and the other coil end 8. T_30 in Fig. 7 shows the state after the stator 1 has been charged. Meanwhile, T_31 to T32 show the state after the stator 1 has been neutralized. As shown by the solid line C, the stator 1 that has been neutralized by the ionizer has a charging voltage detected by the third sensor 33 (i.e., the charging voltage of the coating 20 on one coil end 7) that increases by +1 kV over time, reaching a voltage that is strong enough to cause a person to feel an electric shock.

[0040] FIG. 8 shows a state in which the coating 20 of the multiple wires constituting one coil end 7 is charged to an absolute value greater than −1 kV, and then positive ions are irradiated from an ionizer onto one coil end 7, and positive and negative ions are irradiated from the ionizer onto the other coil end 8. T_40 in Fig. 8 shows the state after the stator 1 has been charged. Meanwhile, T_41 to T42 show the state after the stator 1 has been neutralized. As shown by the solid line C, the stator 1 that has been neutralized by the ionizer has a charging voltage detected by the third sensor 33 (i.e., the charging voltage of the coating 20 on one coil end 7) that exceeds +1 kV over time, reaching a voltage that is strong enough to cause a person to feel an electric shock.

[0041] FIG. 9 shows a state in which the coating 20 of the multiple wires constituting one coil end 7 is charged to a value close to -1 kV, and then positive ions are irradiated from an ionizer onto one coil end 7, and negative ions are irradiated onto the other coil end 8. T_50 in FIG. 9 shows the state after the stator 1 has been charged. Meanwhile, T_51 to T_52 show the state after the stator 1 has been neutralized. As indicated by dashed line A, in the stator 1 neutralized by the ionizer, the charged voltage detected by the first sensor 31 (i.e., the charged voltage of the coating 20 of the coil end 8 on the other side) becomes larger in absolute value than −1 kV over time, reaching a voltage high enough to cause a person to feel an electric shock. Also, as indicated by solid line C, the charged voltage detected by the third sensor 33 (i.e., the charged voltage of the coating 20 of the coil end 7 on one side) becomes larger in absolute value than +1 kV over time, reaching a voltage high enough to cause a person to feel an electric shock.

[0042] In this way, it was confirmed that the ionizer serving as the comparative example was unable to neutralize the static electricity from the stator 1.

[0043] (Operation and effect of the first embodiment) Compared with the ionizer described above as a comparative example, the static elimination method and static eliminator of the first embodiment have the following configuration and the resulting effects.

[0044] (1) The static elimination method of the first embodiment includes the following: bringing a grounded first contact portion 11 into contact with the core 3 of the stator 1; bringing a grounded second contact portion 12 into contact with a metal portion 21 of the wire material constituting the coil 2 or a metal portion 21 of the power line 10; and bringing a grounded third contact portion 13 into contact with the coating 20 of the plurality of wire materials constituting one coil end 7. Then, the contact between the core 3 and the first contact portion 11, the contact between the metal portion 21 of the wire material or the metal portion 21 of the power line 10 and the second contact portion 12, and the contact between the coating 20 of the plurality of wire materials and the third contact portion 13 are simultaneously carried out. This static elimination method can prevent dielectric polarization in the coating 20 of the wire and eliminate static electricity from the stator 1. Therefore, the productivity and safety of the stator 1 can be improved.

[0045] (2) The static eliminator of the first embodiment includes a first contact portion 11, a second contact portion 12, a third contact portion 13, and a drive unit 15. The first contact portion 11, the second contact portion 12, and the third contact portion 13 are all grounded. The first contact portion 11 is capable of contacting the core 3 of the stator 1. The second contact portion 12 is capable of contacting a metal portion 21 of a wire constituting the coil 2 or a metal portion 21 of the power line 10. The third contact portion 13 is capable of contacting a coating 20 of a plurality of wires constituting one coil end 7. The drive unit 15 operates at least one of the first contact portion 11, the second contact portion 12, the third contact portion 13, and the stator 1 so as to simultaneously bring the core 3 into contact with the first contact portion 11, the metal portion 21 of the wire or the metal portion 21 of the power line 10 into contact with the second contact portion 12, and the coating 20 of the plurality of wires into contact with the third contact portion 13. This allows the static eliminator to prevent dielectric polarization in the coating 20 of the wire and to eliminate static electricity from the stator 1.

[0046] (3) However, if, as viewed from the axial direction of the core 3, part of the area where the coatings 20 of the multiple wires constituting one coil end 7 are arranged does not overlap the plate portion 16 of the third contact portion 13, the following problem occurs. That is, in that case, even if the coatings 20 of the multiple wires constituting one coil end 7 are brought into contact with the plate portion 16 of the third contact portion 13, electric charge will escape to the portion of the coatings 20 of the multiple wires that is not in contact with the plate portion 16 of the third contact portion 13, causing dielectric polarization. In contrast, in the static eliminator of the first embodiment, when viewed from the axial direction of the core 3, the entire area where the coatings 20 of the multiple wires constituting one coil end 7 are arranged overlaps the plate portion 16 of the third contact portion 13. This prevents dielectric polarization from occurring in the coatings 20 of the multiple wires when the coatings 20 of the multiple wires constituting one coil end 7 are brought into contact with the plate portion 16 of the third contact portion 13, thereby ensuring static elimination of the stator 1.

[0047] (Second embodiment) The second embodiment will be described. In the second embodiment, a part of the stator 1 and a part of the static eliminator are changed from the first embodiment, and the rest is the same as the first embodiment, so only the parts that are different from the first embodiment will be described.

[0048] 10, in the stator 1 that is the target of static elimination by the static eliminator of the second embodiment, welded portions 9, where the ends of the wires that make up the other coil end 8 are joined together, are molded with a resin portion 5. Note that a resin portion 5 may be provided for each of the multiple welded portions 9, or the multiple welded portions 9 may be resin-molded together.

[0049] The static eliminator of the second embodiment includes a first contact portion 11, a second contact portion 12, a third contact portion 13, a fourth contact portion 14, a drive unit 15, and the like.

[0050] The first contact portion 11, the second contact portion 12, and the third contact portion 13 are substantially the same as those described in the first embodiment, and therefore, description thereof will be omitted.

[0051] Like the first contact portion 11, the second contact portion 12, and the third contact portion 13, the fourth contact portion 14 is also formed of a conductor and is grounded by a ground wire (not shown) or the like. The fourth contact portion 14 is capable of contacting the resin portion 5 that molds the wires that make up the other coil end 8. Specifically, the fourth contact portion 14 has an upper plate portion 17 that is formed in an annular or disk shape. The upper plate portion 17 is also formed of a conductor. When viewed from the axial direction of the core 3, the area S3 of the upper plate portion 17 of the fourth contact portion 14 is equal to or larger than the area S4 of the region where the resin portion 5 that molds the wires that make up the other coil end 8 is arranged. When viewed from the axial direction of the core 3, the entire region where the resin portion 5 that molds the wires that make up the other coil end 8 is arranged overlaps the upper plate portion 17 of the fourth contact portion 14. Therefore, the upper plate portion 17 of the fourth contact portion 14 can come into contact with almost the entire resin portion 5 that molds the multiple wires that make up the other coil end 8. This allows the fourth contact portion 14 to prevent dielectric polarization of static electricity that has accumulated in the resin portion 5 that molds the multiple wires that make up the other coil end 8, and to neutralize the static electricity. Note that while it is preferable for the fourth contact portion 14 to come into contact with all of the resin portion 5, this is not a limitation, and it is also possible that the fourth contact portion 14 does not come into contact with some of the resin portions 5 due to manufacturing tolerances, etc.

[0052] Driving device 15 is a device that moves at least one of first contact portion 11, second contact portion 12, third contact portion 13, fourth contact portion 14, and stator 1, and brings first contact portion 11, second contact portion 12, third contact portion 13, and fourth contact portion 14 into contact with predetermined positions on stator 1. Driving device 15 operates at least one of first contact portion 11, second contact portion 12, third contact portion 13, fourth contact portion 14, and stator 1 so as to simultaneously bring core 3 into contact with first contact portion 11, metal portion 21 of power line 10 into contact with second contact portion 12, coatings 20 of the multiple wires into contact with third contact portion 13, and resin portion 5 into contact with fourth contact portion 14.

[0053] 10, the driving device 15 is configured to operate the first contact portion 11, the second contact portion 12, and the fourth contact portion 14. When the stator 1 is placed on the plate portion 16 of the third contact portion 13, the coating 20 of the multiple wires constituting one coil end 7 comes into contact with the plate portion 16 of the third contact portion 13. In this state, the driving device 15 moves the first contact portion 11, the second contact portion 12, and the fourth contact portion 14, respectively, to bring the first contact portion 11 into contact with the core 3, bring the second contact portion 12 into contact with the metal portion 21 of the power line 10 or the metal portion 21 of the wire, and bring the fourth contact portion 14 into contact with the resin portion 5. As a result, the core 3 comes into contact with the first contact portion 11, the metal portion 21 of the power line 10 comes into contact with the second contact portion 12, the coatings 20 of the wires come into contact with the third contact portion 13, and the resin portion 5 comes into contact with the fourth contact portion 14, and these contact times overlap. Therefore, static electricity charged to each portion of the stator 1 is neutralized without escaping to another portion within the stator 1.

[0054] Furthermore, in the second embodiment, the coatings 20 of the plurality of wires come into contact with the third contact portion 13, and the resin portion 5 comes into contact with the fourth contact portion 14, so that it is possible to measure the size of the stator 1 in the axial direction as well as to eliminate static electricity from the stator 1. In other words, the static eliminator can be used not only as a device for eliminating static electricity from the stator 1, but also as a device for measuring the size of the stator 1 in the axial direction.

[0055] The static eliminator and static eliminator method of the second embodiment described above have the following configuration and provide the following effects.

[0056] (1) The static elimination method of the second embodiment includes the following: bringing a grounded first contact portion 11 into contact with the core 3 of the stator 1; bringing a grounded second contact portion 12 into contact with a metal portion 21 of the power line 10; bringing a grounded third contact portion 13 into contact with the coating 20 of the multiple wires that make up the coil end 7 on one side; and bringing a grounded fourth contact portion 14 into contact with a resin portion 5 that molds the coil end 8 on the other side. Then, the contact between the core 3 and the first contact portion 11, the contact between the metal portion 21 of the power line 10 and the second contact portion 12, the contact between the coating 20 of the multiple wires and the third contact portion 13, and the contact between the resin portion 5 and the fourth contact portion 14 are simultaneously performed. This static elimination method can prevent dielectric polarization in the resin portion 5 that molds the wire and in the coating 20 of the wire, and can eliminate static electricity from the stator 1. Therefore, the productivity and safety of the stator 1 can be improved.

[0057] (2) The static elimination method of the second embodiment includes the following: By bringing the third contact portion 13 into contact with the coating 20 of the multiple wires that make up the coil end 7 on one side, and bringing the fourth contact portion 14 into contact with the resin portion 5 that molds the coil end 8 on the other side, static elimination of the stator 1 and measurement of the axial size of the stator 1 are performed. According to this, by simultaneously performing the static elimination of the stator 1 and the measurement of the size of the stator 1 in the axial direction, the manufacturing process can be simplified, the working time can be shortened, and productivity can be improved.

[0058] (3) The static eliminator of the second embodiment includes a first contact portion 11, a second contact portion 12, a third contact portion 13, a fourth contact portion 14, and a drive unit 15. The first contact portion 11, the second contact portion 12, the third contact portion 13, and the fourth contact portion 14 are all grounded. The first contact portion 11 is capable of contacting the core 3 of the stator 1. The second contact portion 12 is capable of contacting the metal portion 21 of the power line 10. The third contact portion 13 is capable of contacting the coating 20 of the multiple wires that make up one coil end 7. The fourth contact portion 14 is capable of contacting the resin portion 5 that molds the other coil end 8. Then, the drive device 15 operates at least one of the first contact portion 11, the second contact portion 12, the third contact portion 13, the fourth contact portion 14 and the stator 1 so as to simultaneously bring the core 3 into contact with the first contact portion 11, the metal portion 21 of the power line 10 into contact with the second contact portion 12, the coating 20 of the multiple wires into contact with the third contact portion 13, and the resin portion 5 into contact with the fourth contact portion 14. This allows the static eliminator to prevent dielectric polarization in the resin portion 5 that molds the wire and in the coating 20 of the wire, and to eliminate static electricity from the stator 1.

[0059] (4) However, if, as viewed from the axial direction of the core 3, part of the area in which the resin part 5 that molds the multiple wires that make up the other coil end 8 is arranged does not overlap the upper plate part 17 of the fourth contact part 14, the following problem occurs. That is, in that case, even if the resin part 5 that molds the multiple wires that make up the other coil end 8 is brought into contact with the upper plate part 17 of the fourth contact part 14, electric charge will escape to the part of the resin part 5 that is not in contact with the upper plate part 17 of the fourth contact part 14, causing dielectric polarization. In contrast, in the static eliminator of the second embodiment, when viewed from the axial direction of the core 3, the entire area where the resin portion 5 that molds the multiple wires that make up the other coil end 8 is arranged overlaps with the upper plate portion 17 of the fourth contact portion 14. This prevents dielectric polarization from occurring in the resin portion 5 when the resin portion 5 that molds the multiple wires that make up the other coil end 8 is brought into contact with the upper plate portion 17 of the fourth contact portion 14, and static electricity can be eliminated from the stator 1.

[0060] (Other embodiments) (1) In the above embodiments, the armature to be neutralized is described as the stator 1. However, the armature to be neutralized may be a rotor having a coil 2.

[0061] (2) In the above embodiment, the coil 2 of the stator 1 to be neutralized is described as being Y-connected, but this is not limited to this and may be a Δ-connection, a ΔY-connection, a YΔ-connection, a ΔΔ-connection, a YY-connection, etc.

[0062] The present invention is not limited to the above-described embodiments and can be modified as appropriate within the scope of the claims. Furthermore, the above-described embodiments are not unrelated to each other and can be combined as appropriate unless the combination is clearly impossible. It goes without saying that the elements constituting the embodiments are not necessarily essential unless specifically stated as essential or clearly considered essential in principle. Furthermore, when the numbers, values, amounts, ranges, etc. of the components of the embodiments are mentioned in the above-described embodiments, they are not limited to the specific numbers unless specifically stated as essential or clearly limited to a specific number in principle. Furthermore, when the shapes, positional relationships, etc. of the components are mentioned in the above-described embodiments, they are not limited to the shapes, positional relationships, etc., unless specifically stated or clearly limited to a specific shape, positional relationship, etc. in principle.

[0063] The features of the present invention are as follows. [Claim 1] A static elimination method for eliminating static electricity from an armature that constitutes a rotating electric machine, comprising: bringing a grounded first contact portion (11) into contact with a core (3) of the armature; bringing a grounded second contact portion (12) into contact with a metal portion (21) of a wire constituting a coil (2) of the armature or a metal portion of a power line (10) electrically connected to the coil; The static elimination method includes simultaneously contacting a grounded third contact portion (13) with the coatings (20) of the wires constituting the coil ends (7) of the coil that protrude from the slots (4) of the core toward one side in the axial direction of the core. [Claim 2] A static elimination method for eliminating static electricity from an armature that constitutes a rotating electric machine, comprising: bringing a grounded first contact portion (11) into contact with a core (3) of the armature; bringing a grounded second contact portion (12) into contact with a metal portion (21) of a power line electrically connected to a coil (2) of the armature; bringing a grounded third contact portion into contact with coatings (20) of the plurality of wire rods constituting coil ends (7) of the coil that protrude from the slots (4) of the core toward one side in the axial direction of the core; The static elimination method includes simultaneously contacting a grounded fourth contact portion (14) with a resin portion (5) that molds the plurality of wires that make up the coil end (8) of the coil that protrudes from the slot of the core to the other side in the axial direction of the core. [Claim 3] 3. The static elimination method according to claim 2, further comprising: bringing the third contact portion into contact with the coatings of the wire rods that constitute a coil end that protrudes on one side in the axial direction of the core; and bringing the fourth contact portion into contact with the resin portion that molds the wire rods that constitute a coil end that protrudes on the other side in the axial direction of the core, thereby eliminating static from the armature and measuring the size of the armature in the axial direction. [Claim 4] 4. The static elimination method according to claim 1, wherein the armature is a stator or a rotor that constitutes the rotating electric machine. [Claim 5] A static eliminator for eliminating static electricity from an armature of a rotating electric machine, a first contact portion (11) capable of contacting a core (3) of the armature and being grounded; a second contact portion (12) that is grounded and that is capable of contacting a metal portion (21) of a wire that constitutes a coil (2) of the armature or a metal portion of a power line (10) that is electrically connected to the coil; a third contact portion that is capable of contacting coatings (20) of the plurality of wires that constitute coil ends (7) of the coil that protrude from the slots of the core toward one side in the axial direction of the core and is grounded; and a drive device (15) that operates at least one of the first contact portion, the second contact portion, the third contact portion, and the armature so as to simultaneously bring the core into contact with the first contact portion, the metal portion of the wire or the metal portion of the power line into contact with the second contact portion, and the coatings of the multiple wires into contact with the third contact portion. [Claim 6] 6. The static eliminator according to claim 5, wherein, when viewed from the axial direction of the core, all of the areas where the coating is arranged on the multiple wires that make up the coil ends that protrude to one side in the axial direction of the core overlap with the plate portion (16) of the third contact portion. [Claim 7] A static eliminator for eliminating static electricity from an armature of a rotating electric machine, a first contact portion (11) capable of contacting a core (3) of the armature and being grounded; a second contact portion (12) that is grounded and that is capable of contacting a metal portion of a power line (10) electrically connected to the coil (2) of the armature; a third contact portion (13) capable of contacting coatings (20) of a plurality of wires constituting a coil end (7) of the coil that protrudes from the slot (4) of the core toward one side in the axial direction of the core and that is grounded; a fourth contact portion (14) that is capable of coming into contact with a resin portion (5) that molds the plurality of wires that constitute a coil end (8) of the coil that protrudes from the slot of the core toward the other side in the axial direction of the core, and that is grounded; and a drive device (15) that operates at least one of the first contact portion, the second contact portion, the third contact portion, the fourth contact portion, and the armature so as to simultaneously bring the core into contact with the first contact portion, the metal portion of the power line into contact with the second contact portion, the coatings of the multiple wires into contact with the third contact portion, and the resin portion into contact with the fourth contact portion. [Claim 8] 8. The static eliminator according to claim 7, wherein, when viewed from the axial direction of the core, all of the areas where the coating is arranged on the multiple wires that make up the coil ends that protrude to one side in the axial direction of the core overlap with the plate portion (16) of the third contact portion. [Claim 9] 9. The static eliminator according to claim 7, wherein, when viewed from the axial direction of the core, the entire area in which the resin portion that molds the plurality of wires that constitute the coil end that protrudes to the other side in the axial direction of the core is arranged overlaps with an upper plate portion (17) of the fourth contact portion. [Claim 10] 10. The static eliminator according to claim 5, wherein the armature is a stator or a rotor that constitutes the rotating electric machine. [Explanation of symbols]

[0064] 1 Stator (armature) 2 coils 3 cores 7, 8 coil ends 10 Power line 11 1st contact part 12 Second contact part 13 Third contact part 20. Membrane 21 Metal part

Claims

1. A static elimination method for eliminating static electricity from an armature that constitutes a rotating electric machine, comprising: bringing a grounded first contact portion (11) into contact with a core (3) of the armature; bringing a grounded second contact portion (12) into contact with a metal portion (21) of a wire constituting a coil (2) of the armature or a metal portion of a power line (10) electrically connected to the coil; The static elimination method includes simultaneously contacting a grounded third contact portion (13) with the coatings (20) of the plurality of wires constituting the coil ends (7) of the coil that protrude from the slots (4) of the core toward one side in the axial direction of the core.

2. A static elimination method for eliminating static electricity from an armature that constitutes a rotating electric machine, comprising: bringing a grounded first contact portion (11) into contact with a core (3) of the armature; bringing a grounded second contact portion (12) into contact with a metal portion (21) of a power line electrically connected to a coil (2) of the armature; contacting a grounded third contact portion with coatings (20) of the plurality of wire rods constituting a coil end (7) of the coil that protrudes from the slot (4) of the core toward one side in the axial direction of the core; The static elimination method includes simultaneously contacting a grounded fourth contact portion (14) with a resin portion (5) that molds the plurality of wires that constitute the coil end (8) of the coil that protrudes from the slot of the core to the other side in the axial direction of the core.

3. 3. The static elimination method according to claim 2, further comprising: bringing the third contact portion into contact with the coating of the plurality of wire rods that constitute a coil end that protrudes on one side in the axial direction of the core; and bringing the fourth contact portion into contact with the resin portion that molds the plurality of wire rods that constitute a coil end that protrudes on the other side in the axial direction of the core, thereby eliminating static from the armature and measuring the size of the armature in the axial direction.

4. 4. The static elimination method according to claim 1, wherein the armature is a stator or a rotor that constitutes the rotating electrical machine.

5. A static eliminator for eliminating static electricity from an armature of a rotating electric machine, a first contact portion (11) capable of contacting a core (3) of the armature and grounded; a second contact portion (12) that is capable of contacting a metal portion (21) of a wire constituting a coil (2) of the armature or a metal portion of a power line (10) electrically connected to the coil and that is grounded; a third contact portion that is capable of contacting coatings (20) of the plurality of wires that constitute a coil end (7) of the coil that protrudes from the slot of the core toward one side in the axial direction of the core and is grounded; a drive device (15) that operates at least one of the first contact portion, the second contact portion, the third contact portion, and the armature so as to simultaneously bring the core into contact with the first contact portion, the metal portion of the wire or the metal portion of the power line into contact with the second contact portion, and the coatings of multiple wires into contact with the third contact portion.

6. 6. The static elimination device according to claim 5, wherein, when viewed from the axial direction of the core, all of the areas in which the coating is arranged on the plurality of wires constituting the coil ends protruding to one side in the axial direction of the core overlap with the plate portion (16) of the third contact portion.

7. A static eliminator for eliminating static electricity from an armature of a rotating electric machine, a first contact portion (11) capable of contacting a core (3) of the armature and grounded; a second contact portion (12) that is capable of contacting a metal portion of a power line (10) electrically connected to the coil (2) of the armature and is grounded; a third contact portion (13) capable of contacting coatings (20) of a plurality of wires constituting a coil end (7) of the coil that protrudes from the slot (4) of the core toward one side in the axial direction of the core and that is grounded; a fourth contact portion (14) that is capable of coming into contact with a resin portion (5) that molds the plurality of wire rods that constitute a coil end (8) of the coil that protrudes from the slot of the core toward the other side in the axial direction of the core, and that is grounded; a drive device (15) that operates at least one of the first contact portion, the second contact portion, the third contact portion, the fourth contact portion, and the armature so as to simultaneously bring the core into contact with the first contact portion, the metal portion of the power line into contact with the second contact portion, the coatings of the multiple wires into contact with the third contact portion, and the resin portion into contact with the fourth contact portion.

8. 8. The static elimination device according to claim 7, wherein, when viewed from the axial direction of the core, all of the areas in which the coating is arranged on the plurality of wires constituting the coil ends protruding to one side in the axial direction of the core overlap with the plate portion (16) of the third contact portion.

9. 9. The static eliminator according to claim 7, wherein, when viewed from the axial direction of the core, all of the areas in which the resin portion that molds the plurality of wires that constitute the coil end that protrudes to the other side of the axial direction of the core is arranged overlap with an upper plate portion (17) of the fourth contact portion.

10. 8. The static eliminator according to claim 5, wherein the armature is a stator or a rotor that constitutes the rotating electric machine.

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