WO2018055701A1 - 誘導電動機の回転子及び誘導電動機 - Google Patents
誘導電動機の回転子及び誘導電動機 Download PDFInfo
- Publication number
- WO2018055701A1 WO2018055701A1 PCT/JP2016/077862 JP2016077862W WO2018055701A1 WO 2018055701 A1 WO2018055701 A1 WO 2018055701A1 JP 2016077862 W JP2016077862 W JP 2016077862W WO 2018055701 A1 WO2018055701 A1 WO 2018055701A1
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- WIPO (PCT)
- Prior art keywords
- rotor
- end ring
- reinforcing member
- induction motor
- peripheral portion
- Prior art date
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- 230000006698 induction Effects 0.000 title claims abstract description 41
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 137
- 238000003780 insertion Methods 0.000 claims abstract description 21
- 230000037431 insertion Effects 0.000 claims abstract description 21
- 230000002093 peripheral effect Effects 0.000 claims description 85
- 239000004020 conductor Substances 0.000 claims description 62
- 239000000463 material Substances 0.000 description 11
- 230000007423 decrease Effects 0.000 description 10
- 230000004048 modification Effects 0.000 description 8
- 238000012986 modification Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 4
- 238000004512 die casting Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000002787 reinforcement Effects 0.000 description 4
- 238000007689 inspection Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000005219 brazing Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000004918 carbon fiber reinforced polymer Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
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- 229910052742 iron Inorganic materials 0.000 description 1
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- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
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Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
- H02K1/30—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures using intermediate parts, e.g. spiders
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K17/00—Asynchronous induction motors; Asynchronous induction generators
- H02K17/02—Asynchronous induction motors
- H02K17/16—Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/26—Rotor cores with slots for windings
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K17/00—Asynchronous induction motors; Asynchronous induction generators
- H02K17/02—Asynchronous induction motors
- H02K17/16—Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors
- H02K17/165—Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors characterised by the squirrel-cage or other short-circuited windings
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K17/00—Asynchronous induction motors; Asynchronous induction generators
- H02K17/02—Asynchronous induction motors
- H02K17/16—Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors
- H02K17/168—Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors having single-cage rotors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/12—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors arranged in slots
Definitions
- the present invention relates to an induction motor rotor and an induction motor.
- a rotor of an induction motor disclosed in Patent Document 1 includes a rotor core that is a stratified core, a shaft that penetrates the rotor core, a conductor bar that is a cage bar that penetrates the rotor core, and a rotor core.
- An end ring that is an annular short-circuit ring provided at a position spaced apart from the end of the first ring, a first reinforcing member that is an annular support ring provided between the end ring and the shaft, and an outer peripheral portion of the end ring And a second reinforcing member that is an annular shrink-fitted ring.
- the present invention has been made in view of the above, and an object thereof is to obtain a rotor of an induction motor that can suppress a decrease in service life.
- the rotor of the induction motor includes a rotor core, a conductor bar passing through the rotor core in the axial direction of the center axis of the rotor core, An annular end ring provided at an end of the core and connected to a conductor bar protruding from the end of the rotor core, and an annular first ring provided between the rotor core and the end ring and in contact with the end ring A reinforcing member.
- the first reinforcing member is formed with an insertion hole into which a conductor bar protruding from the end of the rotor core is inserted.
- the rotor of the induction motor according to the present invention has an effect of suppressing a decrease in the life of the rotor.
- Sectional drawing of the induction motor which concerns on embodiment of this invention Sectional drawing of the rotor of the induction motor which concerns on embodiment of this invention III-III arrow sectional view shown in FIG. 2 is a perspective view of the end ring shown in FIG. The perspective view of the 2nd reinforcement member shown in FIG. The side view seen from the opposite side to the rotor core of the 1st reinforcement member shown in FIG. VII-VII arrow sectional view shown in FIG. Side view of a comparative example for the first reinforcing member shown in FIG. IX-IX arrow cross-sectional view shown in FIG.
- the figure for demonstrating the state of an end ring when the rotational speed changes in the rotor of the induction motor which concerns on embodiment of this invention.
- the figure for demonstrating the 2nd modification of the rotor of the induction motor which concerns on embodiment of this invention The figure for demonstrating the modification of the 1st reinforcement member with which the rotor of the induction motor which concerns on embodiment of this invention is provided.
- FIG. 1 is a cross-sectional view of an induction motor according to an embodiment of the present invention.
- FIG. 2 is a sectional view of the rotor of the induction motor according to the embodiment of the present invention.
- 3 is a cross-sectional view taken along arrow III-III shown in FIG.
- FIG. 4 is a perspective view of the end ring shown in FIG.
- FIG. 5 is a perspective view of the second reinforcing member shown in FIG. 6 is a side view of the first reinforcing member shown in FIG. 2 as viewed from the side opposite to the rotor core.
- 7 is a cross-sectional view taken along arrow VII-VII shown in FIG.
- the stator 1 includes a stator 200 and a rotor 100 provided inside the stator 200.
- the stator 200 includes a cylindrical housing 210 and a stator core 220 provided inside the housing 210.
- the stator core 220 is configured by laminating a plurality of thin plates punched in an annular shape from a magnetic steel sheet base material (not shown) in the axial direction D1 of the central axis AX of the rotor core 1.
- the plurality of thin plates are fixed to each other by caulking, welding, or bonding.
- a plurality of coils 230 are arranged on the stator core 220.
- the coil end on one end side of the coil 230 in the axial direction D1 protrudes from the one end surface of the stator core 220 in the axial direction D1.
- the coil end on the other end side of the coil 230 in the axial direction D1 protrudes from the other end surface of the stator core 220 in the axial direction D1.
- the rotor 100 includes a cylindrical rotor core 1 and a shaft 2 that penetrates the through hole 1 a of the rotor core 1.
- the rotor core 1 is provided near the outer peripheral surface of the rotor core 1, and is disposed in each of the plurality of core slots 5 arranged in the direction D2 around the central axis AX of the rotor core 1 and the plurality of core slots 5.
- a conductor bar 6 penetrating the rotor core 1 in the axial direction D1.
- the rotor 100 includes an annular end ring 3-1 provided at one end 1b1, which is one end of the rotor core 1 in the axial direction D1, and between the rotor core 1 and the end ring 3-1.
- An annular first reinforcing member 4-1 provided in contact with the end ring 3-1 and an annular end ring 3 provided at the other end 1 b 2 which is the other end of the rotor core 1 in the axial direction D 1.
- -1 and an annular first reinforcing member 4-2 provided between the rotor core 1 and the end ring 3-2 and in contact with the end ring 3-2.
- One end 6a of a conductor bar 6 protruding from one end 1b1 of the rotor core 1 is connected to the end ring 3-1.
- the inner peripheral portion 3a of the end ring 3-1 is in contact with the first reinforcing member 4-1.
- an inclined surface 3e is formed on the inner peripheral portion 3a of the end ring 3-1 at a portion near the end portion 3d on the side opposite to the rotor core 1 of the end ring 3-1. Is done.
- the inclined surface 3e of the end ring 3-1 has a shape that widens from the rotor core 1 toward the end ring 3-1 in the axial direction D1.
- the other end 6b of the conductor bar 6 protruding from the other end 1b2 of the rotor core 1 is connected to the end ring 3-2.
- the inner peripheral portion 3a of the end ring 3-2 is in contact with the first reinforcing member 4-2.
- an inclined surface 3e is formed at a portion near the end portion 3d on the side opposite to the rotor core 1 of the end ring 3-2.
- the inclined surface 3e of the end ring 3-2 has a shape that widens from the rotor core 1 toward the end ring 3-2 in the axial direction D1.
- the end rings 3-1 and 3-2 have the inclined surface 3 e so that the inner diameter increases in the axial direction D 1 as the distance from the first reinforcing members 4-1 and 4-2 increases.
- the reason why the inclined surface 3e is formed on the end ring 3-1 and the end ring 3-2 will be described later.
- the first reinforcing member 4-1 is formed with an insertion hole 4 a for inserting the conductor bar 6 protruding from the one end 1 b 1 of the rotor core 1.
- the first reinforcing member 4-2 has the insertion hole 4 a of the rotor core 1.
- An insertion hole 4a for inserting the conductor bar 6 protruding from the other end 1b2 is formed.
- the inner diameter of the insertion hole 4 a formed in each of the first reinforcing member 4-1 and the first reinforcing member 4-2 is equal to the outer diameter of the conductor bar 6.
- a through hole 4b is formed at the center of each of the first reinforcing member 4-1 and the first reinforcing member 4-2.
- the shaft 2 passes through the through holes 4 b of the first reinforcing member 4-1 and the first reinforcing member 4-2 and the through holes 1 a of the rotor core 1.
- the rotor 100 includes a second reinforcing member 5-1 provided on the outer peripheral portion 3b of the end ring 3-1, and a second reinforcing member 5-2 provided on the outer peripheral portion 3b of the end ring 3-2.
- the inner peripheral portion 5a of the second reinforcing member 5-1 is in contact with the outer peripheral portion 3b of the end ring 3-1
- the inner peripheral portion 5a of the second reinforcing member 5-2 is an outer peripheral portion of the end ring 3-2. It is in contact with 3b.
- end rings 3-1 and the end ring 3-2 are simply referred to as end rings 3-1 and 3-2
- first reinforcing member 4-1 and the first reinforcing member 4-2 are simply referred to as the first ring.
- the second reinforcing member 5-1 and the second reinforcing member 5-2 may be simply referred to as the second reinforcing members 5-1 and 5-2.
- the outer diameters of the first reinforcing members 4-1, 4-2, the second reinforcing members 5-1, 5-2, and the rotor core 1 are equal in size.
- the width RDW1 between the outer periphery of the first reinforcing members 4-1 and 4-2 and the insertion hole 4a is from the outer periphery of the second reinforcing members 5-1 and 5-2. It is narrower than the width RDW2 to the inner periphery 5a.
- the width RDW1 of the first reinforcing members 4-1, 4-2 is increased, the cross-sectional areas of the one end 6a and the other end 6b of the conductor bar 6 in the radial direction D3 of the rotor core 1 are reduced.
- the end rings 3-1 and 3-2 are reinforced by the first reinforcing members 4-1 and 4-2.
- the effect is improved.
- the reinforcing effect is an effect of suppressing the deformation of the end rings 3-1 and 3-2 due to centrifugal force and thermal expansion. Details of the reinforcing effect will be described later. Further, as the width RDW2 of the second reinforcing members 5-1 and 5-2 becomes wider, the diameters of the end rings 3-1 and 3-2 become smaller, and the contact between the end rings 3-1 and 3-2 and the conductor bar 6 becomes smaller. Since the area is reduced, the resistance value at the connection point between the end rings 3-1 and 3-2 and the conductor bar 6 is increased, but the rigidity of the second reinforcing members 5-1 and 5-2 is improved, so that the second value is increased.
- the width RDW1 of the first reinforcing members 4-1 and 4-2 and the width RDW2 of the second reinforcing members 5-1 and 5-2 are between the end rings 3-1 and 3-2 and the conductor bar 6. It is set in consideration of the resistance value and the reinforcing effect of the end rings 3-1 and 3-2.
- the outer shapes of the first reinforcing members 4-1, 4-2, the second reinforcing members 5-1 and 5-2, and the rotor core 1 are made to have the same dimensions. Different dimensions may be used. In that case, if the inner peripheral portion 5a of the second reinforcing member 5-1, 5-2 is positioned in the insertion hole 4a of the first reinforcing member 4-1, 4-2, the same as above. An effect is obtained. That is, the second reinforcing members 5-1 and 5-2 may be arranged so as to suppress the first reinforcing members 4-1 and 4-2.
- the rotor core 1 is configured by laminating a plurality of thin plates punched in an annular shape from a magnetic steel base material (not shown) in the axial direction D1.
- the plurality of thin plates are fixed to each other by caulking, welding, or bonding.
- Each of the plurality of core slots 5 extends in the axial direction D1 and penetrates from one end 1b1 of the rotor core 1 to the other end 1b2. Further, as shown in FIG. 3, each of the plurality of core slots 5 is skewed in the axial direction D2.
- Examples of the material of the end ring 3-1, the end ring 3-2 and the conductor bar 6 include conductor materials such as aluminum, aluminum alloy, copper or copper alloy.
- the end rings 3-1 and 3-2 and the conductor bar 6 are formed by die casting or brazing using a conductor material.
- the centrifugal force acting on the object depends not only on the object radius and angular velocity but also on the object mass.
- the first reinforcing members 4-1 and 4-2 and the second reinforcing members 5-1 and 5-2 are for suppressing deformation of the end rings 3-1 and 3-2 due to centrifugal force and thermal expansion. It is necessary to make it difficult to deform against centrifugal force. Therefore, the first reinforcing members 4-1, 4-2 and the second reinforcing members 5-1, 5-2 have higher tensile strength per unit mass than the materials of the end rings 3-1, 3-2. Material is used. Examples of the material of the first reinforcing members 4-1, 4-2 and the second reinforcing members 5-1, 5-2 include iron, titanium, or carbon fiber reinforced plastic.
- the first reinforcing member 4-1 includes a first annular portion 41 provided near the inner peripheral portion of the first reinforcing member 4-1 and the first reinforcing member 4. -1 and a second annular portion 42 provided so as to surround the first annular portion 41.
- the outer diameter OD2 of the second annular portion 42 is larger than the outer diameter OD1 of the first annular portion 41.
- the width of the first annular portion 41 in the axial direction D1 is larger than the width of the second annular portion 42 in the axial direction.
- the first reinforcing member 4-1 is formed with a step including the first annular portion 41 and the second annular portion 42.
- the second annular portion 42 is provided with an insertion hole 4 a as shown in FIGS. 6 and 7 near the outer peripheral portion of the second annular portion 42.
- the first reinforcing member 4-1 is formed by integrally molding the first annular portion 41 and the second annular portion 42, and the first reinforcing member 4-1 is manufactured separately. A combination of the first annular portion 41 and the second annular portion 42 may be used.
- the first reinforcing member 4-2 is configured in the same manner as the first reinforcing member 4-1.
- the first reinforcing member 4-1 is attached to one end 1b1 of the rotor core 1, and the first reinforcing member 4-2 is attached to the other end 1b2. Thereafter, the conductor bar 6 and the end rings 3-1 and 3-2 are integrally formed by die casting using the above-described conductor material.
- the inner peripheral portions 3a of the end rings 3-1 and 3-2 are in contact with the outer peripheral portion 41a of the first annular portion 41 shown in FIG. Further, end portions 3c of end rings 3-1 and 3-2 on the side of rotor core 1 are in contact with end portion 42a on the opposite side of rotor core 1 of second annular portion 42 shown in FIG. That is, the end rings 3-1 and 3-2 are arranged so as to be in contact with the steps of the first reinforcing members 4-1, 4-2.
- the outer peripheral portion 3b of each of the end rings 3-1 and 3-2 is cut, and the second reinforcing members 5-1 and 5-2 shown in FIG.
- the outer peripheral portions 3b of 1 and 3-2 are tightly fitted.
- the end ring 3-1 is shrink-fitted to the second reinforcing member 5-1
- the end ring 3-2 is shrink-fitted to the second reinforcing member 5-2.
- the through holes 4b of the first reinforcing members 4-1 and 4-2 and the through holes 1a of the rotor core 1 are finished to the same dimensions, and the shaft 2 is placed inside the through holes 4b and the through holes 1a. It is tightly fitted.
- the shaft 2 is shrink-fitted inside the through hole 4b and the through hole 1a.
- X-rays are emitted from the outer peripheral portion 3b side of the end rings 3-1 and 3-2.
- a flaw detection inspection is performed by irradiation. The flaw detection inspection is performed at this timing because the specific gravity of the materials constituting the second reinforcing members 5-1 and 5-2 and the end rings 3-1 and 3-2 is different.
- 3-2 and the second reinforcing members 5-1 and 5-2 are X-rays of energy suitable for the inspection of the end rings 3-1 and 3-2. This is because it is difficult to transmit -1,5-2.
- the end rings 3-1 and 3- 2 can be accurately inspected.
- the end rings 3-1 and 3-2 are subjected to a force spreading outward in the radial direction D3 due to centrifugal force during rotation.
- one end 6a of the conductor bar 6 protruding from one end 1b1 of the rotor core 1 is inserted into the insertion hole 4a of the first reinforcing member 4-1, and the other end of the rotor core 1 is inserted.
- the other end portion 6b of the conductor bar 6 protruding from the portion 1b2 is inserted into the insertion hole 4a of the first reinforcing member 4-2.
- both ends of the conductor bar 6 protruding from the rotor core 1 are inserted into the insertion holes 4a of the first reinforcing members 4-1 and 4-2. Touch.
- deformation of both ends of the conductor bar 6 is suppressed, and deformation of the end rings 3-1 and 3-2 is also suppressed. Therefore, the stress amplitude generated in the end rings 3-1 and 3-2 each time the rotor 100 is repeatedly started and stopped is reduced, or the end rings 3-1 and 3 are changed each time the rotation speed of the rotor 100 changes. -2 is reduced, the fatigue life of the end rings 3-1 and 3-2 can be improved.
- the reinforcing effect of the end rings 3-1 and 3-2 by the first reinforcing members 4-1 and 4-2 will be specifically described.
- FIG. 8 is a side view of a comparative example for the first reinforcing member shown in FIG. 9 is a cross-sectional view taken along arrow IX-IX shown in FIG.
- Differences between the first reinforcing members 4-1 and 4-2 shown in FIGS. 6 and 7 and the first reinforcing members 4-1A and 4-2A shown in FIGS. 8 and 9 are as follows. .
- the first reinforcing members 4-1A and 4-2A include a second annular portion 42A instead of the second annular portion 42 shown in FIG. (2)
- the second annular portion 42A is not provided with the insertion hole 4a shown in FIG. 7, and the outer diameter OD3 of the second annular portion 42A is outside the second annular portion 42 shown in FIG. It is smaller than the diameter OD2 and larger than the outer diameter OD1 of the first annular portion 41.
- FIG. 10 is a view showing a state in which the end ring is deformed when the rotor of the induction motor using the first reinforcing member according to the comparative example shown in FIGS. 8 and 9 is rotated.
- a rotor 100A of the induction motor shown in FIG. 10 includes a rotor core 1, a conductor bar 6, an end ring 3-1, and a second reinforcing member 5-1, and a first reinforcing member shown in FIGS.
- a member 4-1A is provided.
- the outer peripheral portion of the second annular portion 42 ⁇ / b> A is in contact with the conductor bar 6. That is, the plurality of conductor bars 6 are provided in contact with the outer circumferences of the first reinforcing members 4-1A and 4-2A.
- the outer shapes of the conductor bar 6, the end ring 3-1 and the second reinforcing member 5-1 when the rotor 100A is stopped are indicated by solid lines, and the rotor 100A of the induction motor rotates at high speed.
- the outer shapes of the conductor bar 6, the end ring 3-1 and the second reinforcing member 5-1 which are deformed during the operation are indicated by dotted lines.
- the inner peripheral portion 3a of the end ring 3-1 is in contact with the outer peripheral portion 41a of the first annular portion 41 when the rotor 100A is stopped. Since the second reinforcing member 5-1 is shrink-fitted to the end ring 3-1, the compressive force from the second reinforcing member 5-1 is applied to the end ring 3-1. Therefore, a frictional force is generated between the outer peripheral portion 41a of the first annular portion 41 and the inner peripheral portion 3a of the end ring 3-1. This frictional force serves to suppress the deformation of the end ring 3-1 when the rotor 100A is rotated and when it is thermally expanded.
- a force that spreads outward in the radial direction D3 by centrifugal force acts on the end ring 3-1 when the rotor 100A rotates. Since this force increases as the rotational speed of the rotor 100A increases, the end ring 3-1 is deformed with the connection point with the conductor bar 6 as a fulcrum. At this time, the end ring 3-1 has a radial direction as shown in FIG. 10 against the friction force generated between the inner peripheral portion 3a of the end ring 3-1 and the outer peripheral portion 41a of the first annular portion 41.
- the amount of positional deformation increases.
- the inner and outer diameters of the end ring 3-1 are repeatedly expanded and contracted. The metal fatigue in the progress.
- the one end 6a of the conductor bar 6 connected to the end ring 3-1 is deformed outward in the radial direction D3 with the one end 1b1 of the rotor core 1 as a fulcrum.
- the metal at the one end portion 6a of the conductor bar 6 is increased. Fatigue goes on.
- the rotor 100A may need to be replaced in a period shorter than the design life.
- one end portion 6a of the conductor bar 6 is inserted into the insertion hole 4a of the first reinforcing member 4-1, so that one end portion of the rotor core 1 is rotated during rotation.
- the deformation of the conductor bar 6 protruding from 1b1 outward in the radial direction D3 is suppressed by the first reinforcing member 4-1. Accordingly, the deformation of the one end portion 6a of the conductor bar 6 is suppressed as compared with the rotor 100A shown in FIG. 10, and the reinforcing effect of the end ring 3-1 connected to the conductor bar 6 is enhanced.
- the stress amplitude generated in the end ring 3-1 is reduced, and the fatigue life of the end ring 3-1 can be improved. As a result, a decrease in the life of the rotor 100 is suppressed.
- the outer peripheral portion 41a of the first annular portion 41 in the inner peripheral portions 3a of the end rings 3-1 and 3-2 of the rotor 100 according to the present embodiment is used.
- the reason why the width ADW3 in the axial direction D1 of the contact portion is narrower than the width ADW5 in the axial direction D1 of the outer peripheral portion 3b of the end rings 3-1 and 3-2 will be described.
- FIG. 11 is a diagram for explaining the state of the end ring when the rotation speed changes in the rotor of the induction motor according to the first modification.
- FIG. 12 is a view for explaining the state of the end ring when the rotation speed changes in the rotor of the induction motor according to the embodiment of the present invention.
- FIG. 12 illustrates a rotor 100 according to the embodiment of the present invention
- FIG. 11 illustrates a rotor 100B that is a first modification of the rotor 100 according to the present embodiment.
- FIG. 11 and FIG. 12 show, in order from the top, the rotor in the stop state, in the high-speed rotation state, and in the return from the high-speed rotation state to the stop state.
- a rotor 100B shown in FIG. 11 includes an end ring 3-1A instead of the end ring 3-1 shown in FIG. 12, and a first reinforcing member 4-1 shown in FIG. A reinforcing member 4-1B is provided.
- the first reinforcing member 4-1B includes a first annular portion 41A instead of the first annular portion 41 shown in FIG. (3)
- the rotor 100 shown in FIG. 12 has an effect of suppressing a decrease in the life of the rotor as compared with the rotor 100B shown in FIG. 11 against deformation of the conductor bar 6 due to thermal expansion.
- the entire inner peripheral portion 3a of the end ring 3-1A is in contact with the outer peripheral portion 41a of the first annular portion 41A, and the axial direction D1 of the inner peripheral portion 3a of the end ring 3-1A Is equal to the width in the axial direction D1 of the outer peripheral portion 3b of the end ring 3-1A.
- the width ADW2 in the axial direction D1 of the outer peripheral portion 41a of the first annular portion 41A is equal to the width ADW1 of the inner peripheral portion 3a of the end ring 3-1A.
- the width ADW3 in the axial direction D1 of the portion of the inner peripheral portion 3a of the end ring 3-1 that is in contact with the outer peripheral portion 41a of the first annular portion 41 is the end ring.
- 3-1 is narrower than the width ADW5 in the axial direction D1 of the outer peripheral portion 3b.
- the width ADW4 in the axial direction D1 of the outer peripheral portion 41a of the first annular portion 41 is narrower than the width ADW5 of the outer peripheral portion 3b of the end ring 3-1, and the inner diameter of the end ring 3-1. It is equal to the width ADW3 of the peripheral portion 3a.
- the width ADW3 of the inner peripheral portion 3a of the end ring 3-1 shown in FIG. 12 is narrower than the width ADW1 of the inner peripheral portion 3a of the end ring 3-1A shown in FIG. 11, and the first annular shape shown in FIG.
- the width ADW4 of the outer peripheral portion 41a of the portion 41 is narrower than the width ADW2 of the outer peripheral portion 41a of the first annular portion 41A shown in FIG.
- the end ring 3-1A is in contact with the end 42a of the second annular portion 42.
- the conductor bar 6 thermally expands in the axial direction D1
- the end ring 3-1A has the first ring as shown in FIG. It moves in the axial direction D1 against the frictional force between the outer peripheral portion 41a of the annular portion 41A and the inner peripheral portion 3a of the end ring 3-1A. Since the end ring 3-1A moves away from the second annular portion 42, a gap G1 is generated between the end portion 42a of the second annular portion 42 and the end ring 3-1A.
- the contact area between the two objects is actually non-linear between the load and the frictional force.
- the friction force tends to be smaller as the width becomes narrower. Since the width ADW3 of the inner peripheral portion 3a of the end ring 3-1 in FIG. 12 is narrower than the width ADW5 of the outer peripheral portion 3b of the end ring 3-1, the first annular portion 41 and the end ring 3-1 in FIG.
- the contact area is smaller than the contact area of the first annular portion 41A and the end ring 3-1A in FIG.
- the frictional force between the outer peripheral portion 41a of the first annular portion 41 and the inner peripheral portion 3a of the end ring 3-1 is such that the outer peripheral portion 41a of the first annular portion 41A shown in FIG. It becomes smaller than the frictional force between the inner peripheral portion 3a of 1A.
- the frictional force between the outer peripheral part 41a of the first annular part 41 and the inner peripheral part 3a of the end ring 3-1 is simply referred to as a first frictional force
- the frictional force between the outer peripheral part 41a and the inner peripheral part 3a of the end ring 3-1A is simply referred to as a second frictional force.
- the end ring 3-1 is in contact with the end 42a of the second annular portion 42.
- the end ring 3-1 is caused by the thermal expansion of the conductor bar 6 so that the end ring 3-1 has an outer peripheral portion of the first annular portion 41 as shown second from the top in FIG. It moves in the axial direction D1 against the frictional force between 41a and the inner periphery 3a of the end ring 3-1. Since the end ring 3-1 moves away from the second annular portion 42, a gap G3 is generated between the end portion 42a of the second annular portion 42 and the end ring 3-1, and one end portion 6a of the conductor bar 6 is formed. Is stretched and elastically deformed.
- the end ring 3-1 moves in the axial direction D1 as shown in the third position from the top in FIG.
- the first frictional force in the rotor 100 is smaller than the second frictional force in the rotor 100B shown in FIG. 11, in the rotor 100, the end portion 42a of the second annular portion 42 and the end ring.
- the gap generated between 3-1 can be narrower than the gap G ⁇ b> 2 shown in FIG. 11 or can be eliminated.
- the reinforcing effect of suppressing the deformation of the end ring 3-1 outward in the radial direction D3 due to the centrifugal force during rotation can be enhanced as compared with the rotor 100B shown in FIG.
- the width ADW3 of the inner peripheral portion 3a of the end ring 3-1 shown in FIG. 12 is equal to the width ADW5 of the outer peripheral portion 3b of the end ring 3-1
- the width ADW4 of the outer peripheral portion 41a of the first annular portion 41 is shown. Is made narrower than the width ADW5 of the outer peripheral portion 3b of the end ring 3-1, the first frictional force in the rotor 100 becomes smaller than the second frictional force in the rotor 100B shown in FIG.
- the inner peripheral portion of the end ring 3-1 can be obtained by providing the aforementioned inclined surfaces 3e on the end rings 3-1 and 3-2. It is desirable to make the width ADW3 of 3a narrower than the width ADW5 of the outer peripheral portion 3b of the end ring 3-1. This will be described below.
- FIG. 13 is a view for explaining a second modification of the rotor of the induction motor according to the embodiment of the present invention.
- FIG. 13 shows a partially enlarged view of a rotor 100C according to a modification. Differences between the rotor 100C and the rotor 100 shown in FIG. 2 are as follows. (1)
- the rotor 100C includes an end ring 3-1B instead of the end ring 3-1 shown in FIG. (2)
- the inclined surface 3e shown in FIG. 2 is omitted, the inner peripheral portion 3a of the end ring 3-1B has a flat surface shape, and the axis of the inner peripheral portion 3a of the end ring 3-1B.
- the width in the direction D1 is equal to the width in the axial direction D1 of the outer peripheral portion 3b of the end ring 3-1B.
- the width in the axial direction D1 of the outer peripheral portion 41a of the first annular portion 41 is narrower than the width in the axial direction D1 of the outer peripheral portion 3b of the end ring 3-1B.
- the outer shapes of the conductor bar 6, the end ring 3-1B, and the second reinforcing member 5-1 when the rotor 100C is stopped are indicated by solid lines, and the rotor 100C is rotating at high speed.
- the outer shapes of the conductor bar 6, the end ring 3-1B, and the second reinforcing member 5-1 that are sometimes deformed are indicated by dotted lines.
- the end ring 3-1B Since the end ring 3-1B is connected to one end portion 6a of the conductor bar 6 provided near the outer peripheral surface of the rotor core 1, the end ring 3-1B when the rotor 100C is rotating is The conductor bar 6 is deformed with the connection point with the one end 6a as a fulcrum. For this reason, the largest stress amplitude is generated in the corner portion 3f between the inner peripheral portion 3a and the end portion 3d of the end ring 3-1B than the stress amplitude generated in the portion other than the corner portion 3f.
- the stress amplitude generated in the portion near the inner peripheral portion 3a of the end ring 3-1B is larger than the stress amplitude generated in the portion near the outer peripheral portion 3b of the end ring 3-1B.
- the stress amplitude generated in the end ring 3-1B near the end 3d on the side opposite to the rotor core 1 is the stress amplitude generated in the end ring 3-1B near the end 3c on the rotor core 1 side. Bigger than. Accordingly, the largest stress amplitude in the entire end ring 3-1B is generated in the corner 3f between the inner peripheral portion 3a and the end 3d of the end ring 3-1B that is farthest from the fulcrum during rotation. Therefore, the corner portion 3f is deteriorated the fastest in the end ring 3-1B as a whole, and the deterioration of the end ring 3-1B proceeds from the corner portion 3f as a starting point.
- an inclined surface 3e is formed between the inner peripheral portion 3a and the end portion 3d of the end ring 3-1.
- the portion of the end ring 3-1 that deteriorates the fastest is removed, so that the rotor 100 shown in FIG. 2 has the rotor 100C shown in FIG.
- the inclined surfaces 3e of the end rings 3-1 and 3-2 shown in FIG. 2 are not limited to a flat surface shape, and may be a curved shape.
- FIG. 14 is a view for explaining a modification of the first reinforcing member provided in the rotor of the induction motor according to the embodiment of the present invention. Differences between the first reinforcing members 4-1 and 4-2 shown in FIG. 6 and the first reinforcing members 4-1C and 4-2C shown in FIG. 14 are as follows. (1) The first reinforcing members 4-1C and 4-2C include a first annular portion 41B instead of the first annular portion 41 shown in FIG. (2) A plurality of screw holes 41c arranged in the axial direction D2 are formed at the end 41b of the first annular portion 41B opposite to the rotor core 1.
- the weight of the rotor 100 may be unbalanced depending on the position and size of the insertion holes 4a.
- the unbalance is that the interval between the insertion holes 4a adjacent to each other in the axial direction D2 is not uniform, and the distance from the center of each of the plurality of insertion holes 4a arranged in the axial direction D2 to the central axis AX is uniform. Say not. This unbalance generates vibration when the rotor 100 rotates.
- screws (not shown) are provided in some of the screw holes 41c among the plurality of screw holes 41c formed in the first annular portion 41B.
- weight imbalance is improved.
- a method for improving the weight imbalance in addition to providing the screw hole 41c, a method for improving the weight imbalance by notching a part of the first reinforcing members 4-1C and 4-2C;
- a method of improving the weight imbalance by applying a ballast material typified by an epoxy resin to the first reinforcing members 4-1C and 4-2C can be exemplified.
- the weight unbalance can be improved simply by fastening a screw (not shown) to the screw hole 41c, so that the work for correcting the weight unbalance is easy.
- the manufacturing time of the rotor 100 can be shortened.
- the rotor 100 including the second reinforcing members 5-1 and 5-2 has been described.
- the second reinforcing members 5-1 and 5-2 may be omitted.
- the rotor 100 is provided with the first reinforcing members 4-1 and 4-2. Can suppress the deformation of the end rings 3-1 and 3-2.
- the deformation of the end rings 3-1 and 3-2 can be suppressed even in a speed range higher than a constant rotational speed.
- the example in which the conductor bar 6 is formed by die casting on the first reinforcing members 4-1, 4-2 manufactured in advance has been described.
- the first reinforcing members 4-1, 4-2 are described. May be formed by shrink fitting after forming the conductor bar 6 by brazing.
- the first reinforcing members 4-1 and 4-2 are shrink-fitted into the conductor bar 6, some of the conductor bars 6 out of the plurality of conductor bars 6 are attached to the first reinforcing members 4-1 and 4-2.
- the first reinforcing members 4-1 and 4-2 in the middle of fitting may stay at unintended positions due to expansion due to contact.
- the configuration described in the above embodiment shows an example of the contents of the present invention, and can be combined with another known technique, and can be combined with other configurations without departing from the gist of the present invention. It is also possible to omit or change the part.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Induction Machinery (AREA)
Abstract
Description
図1は本発明の実施の形態に係る誘導電動機の断面図である。図2は本発明の実施の形態に係る誘導電動機の回転子の断面図である。図3は図2に示すIII-III矢視断面図である。図4は図2に示すエンドリングの斜視図である。図5は図2に示す第2の補強部材の斜視図である。図6は図2に示す第1の補強部材の回転子鉄心とは反対側から見た側面図である。図7は図6に示すVII-VII矢視断面図である。
(1)第1の補強部材4-1A,4-2Aは、図7に示す第2の環状部42の代わりに第2の環状部42Aを備える。
(2)第2の環状部42Aには図7に示す挿入孔4aが設けられておらず、第2の環状部42Aの外径寸法OD3は、図7に示す第2の環状部42の外径OD2よりも小さく、かつ、第1の環状部41の外径OD1よりも大きい。
(1)図11に示す回転子100Bは、図12に示すエンドリング3-1の代わりにエンドリング3-1Aを備え、図12に示す第1の補強部材4-1の代わりに第1の補強部材4-1Bを備える。
(2)第1の補強部材4-1Bは、図12に示す第1の環状部41の代わりに第1の環状部41Aを備える。
(3)図12で示す回転子100は、熱膨張による導体バー6の変形に対して図11に示す回転子100Bに比べて回転子の寿命の低下を抑制する効果が得られる。
(1)回転子100Cは、図2に示すエンドリング3-1の代わりにエンドリング3-1Bを備える。
(2)エンドリング3-1Bでは図2に示す傾斜面3eが省かれ、エンドリング3-1Bの内周部3aは平坦な面形状であり、エンドリング3-1Bの内周部3aの軸線方向D1における幅は、エンドリング3-1Bの外周部3bの軸線方向D1における幅と等しい。なお第1の環状部41の外周部41aの軸線方向D1における幅は、エンドリング3-1Bの外周部3bの軸線方向D1における幅よりも狭い。
(1)第1の補強部材4-1C,4-2Cは、図6に示す第1の環状部41の代わりに第1の環状部41Bを備える。
(2)第1の環状部41Bの回転子鉄心1とは反対側の端部41bには、軸線周り方向D2に配列された複数のねじ穴41cが形成される。
Claims (7)
- 回転子鉄心と、
前記回転子鉄心の中心軸の軸線方向に前記回転子鉄心を貫通する導体バーと、
前記回転子鉄心の端部に設けられ、前記端部から突き出る前記導体バーに接続された環状のエンドリングと、
前記回転子鉄心及び前記エンドリングの間に設けられ、前記エンドリングに接する環状の第1の補強部材と
を備え、
前記第1の補強部材には、前記端部から突き出る前記導体バーが挿入される挿入孔が形成されていることを特徴とする誘導電動機の回転子。 - 前記エンドリングの外周部に設けられ、内周部が前記エンドリングの外周部に接する第2の補強部材を備えることを特徴とする請求項1に記載の誘導電動機の回転子。
- 前記第1の補強部材は、
第1の環状部と、
前記第1の環状部の外周に設けられ、前記第1の環状部よりも前記軸線方向の幅が小さい第2の環状部と
を備え、
前記挿入孔は、前記第2の環状部に形成されていることを特徴とする請求項1又は請求項2に記載の誘導電動機の回転子。 - 前記エンドリングは、前記軸線方向における前記第1の環状部の外周部に接する部分の幅が、前記軸線方向における前記エンドリングの外周部の幅よりも狭いことを特徴とする請求項3に記載の誘導電動機の回転子。
- 前記エンドリングは、前記軸線方向において前記第1の補強部材と接する部分から離れるにつれて内径が広がることを特徴とする請求項1から請求項4の何れか一項に記載の誘導電動機の回転子。
- 前記第1の補強部材には、前記回転子鉄心の中心軸の軸線周り方向に配列された複数のねじ穴が形成されていることを特徴とする請求項1から請求項5の何れか一項に記載の誘導電動機の回転子。
- 請求項1から請求項6の何れか一項に記載の誘導電動機の回転子を備えたことを特徴とする誘導電動機。
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2017525429A JP6189001B1 (ja) | 2016-09-21 | 2016-09-21 | 誘導電動機の回転子及び誘導電動機 |
CN201680017615.2A CN108141119A (zh) | 2016-09-21 | 2016-09-21 | 感应电动机的转子及感应电动机 |
DE112016001455.4T DE112016001455T5 (de) | 2016-09-21 | 2016-09-21 | Läufer für einen Asynchronmotor und Asynchronmotor |
PCT/JP2016/077862 WO2018055701A1 (ja) | 2016-09-21 | 2016-09-21 | 誘導電動機の回転子及び誘導電動機 |
KR1020177025943A KR101958133B1 (ko) | 2016-09-21 | 2016-09-21 | 유도 전동기의 회전자 및 유도 전동기 |
US15/549,765 US20180278106A1 (en) | 2016-09-21 | 2016-09-21 | Rotor for induction motor and induction motor |
TW106127765A TWI650920B (zh) | 2016-09-21 | 2017-08-16 | 感應電動機之轉子及感應電動機 |
Applications Claiming Priority (1)
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PCT/JP2016/077862 WO2018055701A1 (ja) | 2016-09-21 | 2016-09-21 | 誘導電動機の回転子及び誘導電動機 |
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US (1) | US20180278106A1 (ja) |
JP (1) | JP6189001B1 (ja) |
KR (1) | KR101958133B1 (ja) |
CN (1) | CN108141119A (ja) |
DE (1) | DE112016001455T5 (ja) |
TW (1) | TWI650920B (ja) |
WO (1) | WO2018055701A1 (ja) |
Cited By (1)
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WO2022180784A1 (ja) * | 2021-02-26 | 2022-09-01 | 株式会社日立インダストリアルプロダクツ | 回転電機 |
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KR101878677B1 (ko) * | 2017-06-29 | 2018-07-16 | 엘지전자 주식회사 | 전동기의 로터 |
EP3540923A1 (de) * | 2018-03-12 | 2019-09-18 | Siemens Aktiengesellschaft | Verfahren zur herstellung eines käfigläufers |
CN114309543B (zh) * | 2021-12-07 | 2023-12-05 | 卧龙电气驱动集团股份有限公司 | 一种感应电机铸铝转子的生产工艺 |
KR20230133511A (ko) | 2022-03-11 | 2023-09-19 | 이권식 | 비닐장갑과 파지 자동 취출장치 |
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-
2016
- 2016-09-21 US US15/549,765 patent/US20180278106A1/en not_active Abandoned
- 2016-09-21 JP JP2017525429A patent/JP6189001B1/ja not_active Expired - Fee Related
- 2016-09-21 WO PCT/JP2016/077862 patent/WO2018055701A1/ja active Application Filing
- 2016-09-21 DE DE112016001455.4T patent/DE112016001455T5/de not_active Withdrawn
- 2016-09-21 KR KR1020177025943A patent/KR101958133B1/ko active IP Right Grant
- 2016-09-21 CN CN201680017615.2A patent/CN108141119A/zh active Pending
-
2017
- 2017-08-16 TW TW106127765A patent/TWI650920B/zh not_active IP Right Cessation
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Also Published As
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KR101958133B1 (ko) | 2019-03-13 |
TW201815023A (zh) | 2018-04-16 |
JPWO2018055701A1 (ja) | 2018-09-27 |
TWI650920B (zh) | 2019-02-11 |
DE112016001455T5 (de) | 2018-06-07 |
CN108141119A (zh) | 2018-06-08 |
US20180278106A1 (en) | 2018-09-27 |
JP6189001B1 (ja) | 2017-08-30 |
KR20180044838A (ko) | 2018-05-03 |
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