WO2015029529A1 - かご型回転子およびかご型回転子の製造方法 - Google Patents
かご型回転子およびかご型回転子の製造方法 Download PDFInfo
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- WO2015029529A1 WO2015029529A1 PCT/JP2014/064431 JP2014064431W WO2015029529A1 WO 2015029529 A1 WO2015029529 A1 WO 2015029529A1 JP 2014064431 W JP2014064431 W JP 2014064431W WO 2015029529 A1 WO2015029529 A1 WO 2015029529A1
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- rotor
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- slots
- cage
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- 238000004519 manufacturing process Methods 0.000 title claims description 18
- 239000004020 conductor Substances 0.000 claims abstract description 7
- 230000002093 peripheral effect Effects 0.000 claims description 9
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- 230000003993 interaction Effects 0.000 abstract 1
- 230000006698 induction Effects 0.000 description 45
- 230000005284 excitation Effects 0.000 description 44
- 230000000694 effects Effects 0.000 description 18
- 238000000034 method Methods 0.000 description 13
- 230000004907 flux Effects 0.000 description 8
- 230000008859 change Effects 0.000 description 4
- 230000009467 reduction Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
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- 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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/0012—Manufacturing cage rotors
-
- 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
- H02K17/20—Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors having deep-bar rotors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
Definitions
- the present invention relates to an induction machine using a squirrel-cage rotor, and more particularly to a cage-type rotor excellent in silence that can reduce vibration of the induction machine and a method of manufacturing a squirrel-cage rotor.
- the rotor slots are densely arranged in the vicinity of the magnet central axis of the rotor, thereby reducing and adjusting the difference in starting torque caused by the input phase and rotor position.
- the motor efficiency is improved (see, for example, Patent Document 1).
- the prior art has the following problems. It is considered that the vibration in the induction machine is generated when the electromagnetic excitation force between the rotor and the stator of the induction machine resonates with the casing of the induction machine.
- the arrangement of the rotor slots is determined based on the position of the rotor magnet. In such a method, a specific resonance frequency of the electromagnetic excitation force of the induction machine is determined. Only the components can be reduced. As a result, there has been a problem that the effect of reducing the vibration of the induction machine is limited.
- the present invention has been made to solve the above-described problems, and has an object to obtain a cage-type rotor excellent in silence that can reduce vibration of an induction machine and a method of manufacturing a cage-type rotor. To do.
- the cage rotor according to the present invention has a plurality of rotor slots on the outer peripheral portion, and the secondary conductor housed in the rotor slot interacts with the rotating magnetic field formed by the stator, so that the interior of the stator And a plurality of rotor slots having the same shape and size, and one rotation of the rotor is equal to the number of poles p of the stator.
- the arrangement intervals with respect to the rotation direction of the rotor are unequal.
- the method for manufacturing a cage rotor according to the present invention includes a step of storing in advance in a storage unit unequal arrangement intervals of a plurality of rotor slots formed on an outer peripheral portion of a stator, and a plurality of rotations.
- the arrangement intervals of are unequal.
- FIG. 1 is a cross-sectional view illustrating an induction machine 1 using a rotor 3 according to Embodiment 1 of the present invention.
- the induction machine 1 shown in FIG. 1 includes a stator 2 and a rotor 3.
- the induction machine 1 is used, for example, as a drive motor for an electric vehicle, a hybrid vehicle, or the like.
- the stator 2 has a stator core 20 having a cylindrical shape.
- a plurality of Ns stator teeth 21 are formed on the inner peripheral portion of the stator core 20 intermittently at an equiangular pitch.
- the same number of stator slots 22 as the stator teeth 21 are formed between the adjacent stator teeth 21.
- a stator coil (not shown) is wound and accommodated in the stator slot 22 so as to include a predetermined number of stator teeth 21 therein.
- the rotor 3 is formed by laminating and integrating a predetermined number of magnetic steel plates, for example, and has a rotor core 30 whose outer peripheral surface forms a cylindrical surface.
- a plurality of Nr rotor slots 32 having the same shape and size are formed on the outer peripheral portion of the rotor core 30 so as to be arranged.
- Each rotor slot 32 accommodates a secondary conductor 33, and both ends in the axial direction of the secondary conductor 33 are short-circuited by a short-circuit ring (not shown) to constitute a cage-type conductor. is doing.
- the rotor 3 is provided with a shaft hole 34, and is arranged with a rotation gap 4 therebetween so that the outer peripheral surface of the rotor 3 can rotate rotatably facing the inner peripheral surface of the stator 2. ing.
- the number Ns of the stator slots 22 is 48
- the number Nr of the rotor slots 32 is 36
- the number of magnetic poles p formed by the stator 2 is 8.
- Ns, Nr, and the number of poles p are not limited to these values.
- FIG. 2 is an example of a schematic cross-sectional view of the structure of the rotor 3 according to the first embodiment of the present invention.
- FIG. 3 is a cross-sectional view of a conventional rotor 3. In the conventional rotor 3 shown in FIG. 3, the arrangement intervals of the rotor slots 32 are equal, whereas in the rotor 3 shown in FIG. 2, the arrangement intervals of the rotor slots 32 are unequal. It is characterized by.
- ⁇ 2 7.0 °
- ⁇ 3 9.5 °
- ⁇ 4 11.5 °
- ⁇ 5 12.5 °
- radial excitation force radial force that does not contribute to torque
- the radial excitation force has periodicity with respect to the rotation direction of the rotor 3.
- ⁇ is defined as the spatial order of the radial excitation force.
- the vibration caused by the radial excitation force and the casing (motor frame; not shown) of the induction machine 1 resonate at a resonance frequency of the spatial order ⁇ through the stator core 20. It is thought that this occurs.
- the spatial order ⁇ s and the spatial order ⁇ r are the number Ns of the stator slots 22 and the rotation.
- Nr the number of child slots 32 and the number p of poles.
- ⁇ s
- ⁇ r
- As and Ar are both arbitrary integers.
- the frequency response of the casing of the induction machine 1 that causes noise of the induction machine 1 tends to increase as the spatial order ⁇ of the radial excitation force decreases. Therefore, reducing the component of the minimum value ⁇ min of the spatial order ⁇ corresponding to the smallest natural number among the spatial orders ⁇ of the radial excitation force expressed by the above equation (4) is a quieter of the induction machine 1. It is effective for improving the performance.
- ⁇ min which is the minimum value of the spatial order ⁇
- the minimum value ⁇ min 2, which is certainly a divisor of the number of poles 6. The same applies to other combinations of (Ns, Nr, p).
- the slot permeance has a periodicity of about a number of times in the circumferential direction of the rotor 3, thereby generating a diameter generated in the induction machine 1. It is considered that the direction excitation force can be reduced.
- the slot permeance component generated by the rotor slot arrangement is classified into the following two cases. That is, there are a case where a spatial order component other than an integer multiple of the number of rotor slots is present and a case where the spatial order component is an integral multiple of the number of rotor slots and other than a times. In the former case, a magnetic flux having a spatial order component other than ⁇ r shown in (Expression 3) is generated in the rotor. Therefore, even if the noise and vibration due to the resonance between the electromagnetic excitation force and the casing, which have become prominent at the beginning, can be reduced, the excitation force having other spatial orders can be generated.
- An electromagnetic excitation force having a spatial order other than ⁇ expressed is generated, and there is a concern that a new noise / vibration problem may occur in a rotational speed region different from the original.
- the effect of reducing components other than the electromagnetic excitation force that causes significant vibration and noise can be obtained, the effect of reducing the component of the electromagnetic excitation force itself that causes significant vibration and noise is small. It can be said.
- noise and vibration generated in an induction machine are generated by a relatively low-order spatial order such as first to fourth order.
- the rotor slot arrangement has an effect of reducing the electromagnetic excitation force of higher-order spatial order components, Of the electromagnetic excitation force, noise and vibration are conspicuous in low-order spatial order components. Even if the high-order spatial order components are reduced, the effect on low noise and low vibration is small. Therefore, it can be said that a remarkable effect can be obtained by giving the rotor slot arrangement a periodicity. Assuming that the electromagnetic excitation force having a lower-order spatial order component is reduced, the same effect can be observed in a rotor slot arrangement having ⁇ -periodicity.
- the first terms (As ⁇ Ns) and (Ar ⁇ Nr) in the above equations (2) and (3) indicating the magnetic flux spatial orders of the stator 2 and the rotor 3 are slots in the rotation direction of the rotor 3.
- a spatial order component that is characteristic (larger than other components) is represented. Therefore, as shown in FIG. 2, by making the arrangement intervals of the rotor slots 32 in the rotational direction of the rotor 3 unequal, the characteristic spatial order component of the radial excitation force is dispersed and a specific It is thought that the noise component can be reduced.
- FIG. 4 is a comparison result of the radial excitation force generated during the load operation of the rotor 3 according to the first embodiment of the present invention with the conventional case.
- FIG. 4 shows the magnitude of the radial excitation force generated in the rotor 3 when the load operation is performed under the same rotational speed and the same torque conditions.
- FIG. 4 the magnitude of the radial excitation force when the rotor 3 of the first embodiment is used on the left side and the conventional rotor 3 is used on the right side is shown.
- the rotor slots 32 increase approximately equally.
- the intervals between the rotor slots 32 are uniform as shown in FIG.
- Other conditions such as the shape and size of the rotor slot 32 are the same in FIGS. From FIG. 4, it can be confirmed that the radial excitation force is reduced by about 50% in the rotor 3 of the first embodiment as compared with the conventional rotor 3.
- the rotor is within the slot unequal arrangement period (360 / a) ° obtained by equally dividing one rotation period of the rotor by the divisor a of the pole number p of the stator.
- the arrangement intervals of the rotor slots with respect to the rotation direction of are unequal.
- the rotor slots 32 are arranged in mirror symmetry with the slot arrangement center line 10 that is the angular center of the slot unequal arrangement period as the symmetry axis, but need not necessarily be mirror symmetry. Further, although the arrangement interval of the rotor slots 32 is monotonously decreased with the angle from the slot arrangement center line 10, it may be monotonously increased.
- Embodiment 2 As an example of a method of making the arrangement intervals of the rotor slots 32 unequal, a method of changing the arrangement intervals of the rotor slots 32 with respect to the rotation direction of the rotor 3 approximately equally is shown. It was. However, as described above, in order to reduce the vibration of the induction machine 1, it is not always necessary to change the difference in an equal manner, and the arrangement interval of the rotor slots 32 becomes unequal within the slot unequal arrangement period. It only has to be. In the second embodiment, as another example of a method of making the arrangement intervals of the rotor slots 32 unequal, the arrangement intervals of the rotor slots 32 can be changed approximately in proportion. As in the first embodiment, it is shown that a cage rotor with excellent quietness that can reduce the vibration of the induction machine 1 can be obtained.
- the first embodiment it is effective to disperse the spatial higher-order component of the slot permeance in order to reduce the specific spatial order component of the radial excitation force.
- the method of dispersing the spatial higher-order components of the slot permeance by changing the arrangement interval of the rotor slots 32 equally is shown.
- the arrangement interval of the rotor slots 32 is For example, the same effect can be obtained by changing the ratio in an equivalent manner.
- Other configurations are the same as those of the first embodiment.
- FIG. 5 is a comparison result of the radial excitation force generated during the load operation of the rotor 3 according to the second embodiment of the present invention with the conventional case.
- the magnitude of the radial excitation force when the rotor 3 of the second embodiment is used on the left side and the conventional rotor 3 is used on the right side is shown. From FIG. 5, it can be confirmed that the radial excitation force is reduced by about 30% in the rotor 3 of the second embodiment as compared with the conventional rotor 3.
- the arrangement interval of the rotor slots is changed in an equal ratio.
- Embodiment 3 FIG.
- the rotor slot 32 when the divisor of the number of poles p is a, the rotor slot 32 with respect to the rotation direction of the rotor 3 within the slot unequal arrangement period (360 / a) °.
- the specific component of the radial excitation force can be reduced. This effect is not affected by the number Ns of stator slots 22 and the number Nr of rotor slots 32.
- FIG. 6 is a cross-sectional view of the rotor 3 according to Embodiment 3 of the present invention.
- the number Ns of stator slots 22 and the number Nr of rotor slots 32 are different from those of the first and second embodiments.
- Other conditions such as the shape and size of the rotor slot 32 are the same in FIGS.
- the arrangement interval of the rotor slots 32 is monotonously increased counterclockwise, but may be monotonously decreased.
- FIG. 8 shows a comparison result of the radial excitation force generated during the load operation of the rotor 3 according to the third embodiment of the present invention with the conventional case.
- FIG. 8 confirms that the radial excitation force is reduced in the rotor 3 of the third embodiment as compared with the conventional rotor 3.
- Embodiment 4 FIG.
- the fourth embodiment even if the number of poles p, the number Ns of stator slots 22 and the number Nr of rotor slots 32 are different from those of the first to third embodiments, It shows that the same effects as those of Embodiments 1 to 3 can be obtained.
- FIG. 9 is a cross-sectional view of the induction machine 1 using the rotor 3 according to Embodiment 4 of the present invention.
- the induction machine 1 shown in FIG. 9 is characterized in that the number of poles p of the stator 2 is six. Further, it is assumed that the number Ns of the stator slots 22 is 36 and the number Nr of the rotor slots 32 is 38. Other configurations are the same as those in the first embodiment.
- the spatial order ⁇ of the radial excitation force expressed by the above equation (4) the spatial order ⁇ min corresponding to the smallest natural number is 2. Therefore, the spatial order of the radial excitation force characteristic of the induction machine 1 according to the fourth embodiment is 2.
- the spatial order ⁇ min corresponding to the minimum natural number is obtained from the number p of poles, the number Ns of the stator slots 22 and the number Nr of the rotor slots 32 using the above equation (4). It can be determined by specifying a.
- FIG. 10 is a comparison result of the radial excitation force generated during the load operation of the rotor 3 according to the fourth embodiment of the present invention with the conventional case. From FIG. 10, it can be confirmed that in the rotor 3 of the fourth embodiment, the radial excitation force is reduced by about 70% as compared with the conventional rotor 3.
- the same effect can be obtained even when the number of poles p, the number of stator slots Ns, and the number of rotor slots Nr are different from those of the first to third embodiments. be able to.
- Embodiment 5 FIG.
- description will be made on the point that the same effects as those of the first to fourth embodiments can be obtained even when various shapes are used as the rotor slot 32.
- the case where the rotor slot 32 has a substantially rectangular shape has been exemplified. Therefore, in the fifth embodiment, the case where the shape of the rotor slot 32 is different from the substantially rectangular shape is also examined, and the influence of the shape of the rotor slot 32 will be described.
- FIG. 11 is an enlarged cross-sectional view of the first rotor slot 32 of the rotor 3 according to the fifth embodiment of the present invention.
- FIG. 12 is an enlarged cross-sectional view of the second rotor slot 32 of the rotor 3 according to the fifth embodiment of the present invention.
- the rotor slot 32 shown in FIG. 11 is characterized in that the inner diameter side has an arc shape. Further, the rotor slot 32 shown in FIG. 12 has a substantially trapezoidal shape.
- the radial excitation force having the spatial order as described in the first embodiment is generated, but the higher-order component of the slot permeance is generated. Is substantially determined by the arrangement of the rotor slots 32 and is not greatly affected by the slot shape. For this reason, even when the shape of the rotor slot 32 is different from the substantially rectangular shape, the radial excitation force can be reduced by the principle described in the first embodiment.
- the rotor slot 32 can be made to have a minimum width of the rotor teeth 35 by making the inner diameter side into an arc shape or a substantially trapezoidal shape. .
- the magnetic flux easily passes through the rotor 3 and the magnetic saturation can be relaxed, so that the noise reduction of the induction machine 1 can be realized without impairing the torque characteristics.
- the fifth embodiment even when the shape of the rotor slot is different from the substantially rectangular shape, the same effect as in the first to fourth embodiments can be obtained, and the torque characteristics are impaired. Therefore, it is possible to appropriately select a slot shape that can realize the noise reduction of the induction machine.
- Embodiment 6 FIG.
- the example in which the rotor slots 32 are arranged radially from the central axis of the rotor 3 in the radial direction has been described.
- the sixth embodiment even when the position on the inner diameter side of the rotor slot 32 is changed in the rotation direction of the rotor 3, the same effect as in the first to fifth embodiments is obtained.
- FIG. 13 is an example of a schematic cross-sectional view of the structure of the rotor 3 according to the sixth embodiment of the present invention.
- the rotor slot 32 shown in FIG. 13 changes the position on the inner diameter side in the rotational direction of the rotor 3 without changing the position of the rotor slot open 31 on the outer shape side as compared with the first embodiment. Thus, an angle with respect to the radial direction is given.
- Other shapes and configurations are the same as those of the first embodiment.
- the rotor 3 As described in the first embodiment, the rotor 3 generates a radial excitation force having a spatial order component. At this time, the high-order component of the slot permeance is generated in the rotor slot 32. It is almost determined by the arrangement, and the influence of the arrangement becomes smaller as it approaches the central axis of the rotor 3. Therefore, the rotor slots 32 are arranged at an angle with respect to the radial direction while keeping the outer slots on the outer diameter side of the rotor slots 32 unequal. Even when equalized compared to the radial side, the radial excitation force can be reduced.
- the minimum width of the rotor teeth 35 can be increased by equalizing the arrangement interval on the inner diameter side of the rotor 3 as compared with the outer diameter side, the magnetic flux can easily pass through the rotor 3, and magnetic Saturation can be relaxed and torque can be improved. Therefore, noise reduction of the induction machine 1 can be realized without impairing torque characteristics.
- the torque of the induction machine can be improved by equalizing the arrangement interval on the rotor slot inner diameter side compared to the outer diameter side.
- Embodiment 7 FIG. In the seventh embodiment, a method for manufacturing the rotor 3 of the first to fifth embodiments will be described.
- FIG. 14 is a flowchart when the rotor 3 according to the seventh embodiment of the present invention is created by a notching method.
- a method of creating the rotor slot 32 in the rotor 3 having the same shape and size and unequal arrangement intervals as described in the first to fifth embodiments will be described with reference to FIG. Will be described.
- step S1 the rotation angle controller stores the unequal arrangement intervals of the plurality of rotor slots 32 formed on the outer peripheral portion of the stator 2 in the storage unit in advance.
- the unequal arrangement intervals of the rotor slots 32 may be calculated according to a preset calculation formula in, for example, step S4, instead of being stored in advance.
- step S2 the rotor core which is the rotor 3 in a state before the plurality of rotor slots 32 are formed is arranged at an initial position with respect to the mold.
- step S3 one rotor slot 32 is formed in the rotor core using a mold.
- step S4 the rotation angle controller, based on the unequal arrangement interval stored in the storage unit, an angle corresponding to the arrangement interval between the rotor slot 32 formed first and the rotor slot 32 formed next. To the mold. As a result, the rotor core is rotated by an angle indicated by the rotation angle controller.
- step S5 it is checked whether the rotor core has made one revolution. Then, the processing from step S3 to step S4 is repeated until the rotor core makes one rotation. If the rotor core makes one revolution, the process is terminated.
- the conventional method for manufacturing the rotor 3 in which the rotor slots 32 are evenly spaced corresponds to the case where the rotation angle of the rotor core is constant in step S4. Therefore, even when manufacturing the rotor 3 in which the arrangement intervals of the rotor slots 32 are unequal, a rotation angle controller is provided to change the rotation angle of the rotor core in step S4. It can be easily realized at a low cost without any significant changes to the production line.
- the method for manufacturing a rotor according to the first to fifth embodiments can be easily obtained at a reduced cost.
- the manufacturing method of the rotor 3 it is not limited to the method by the notching shown above, You may manufacture with an integral metal mold
- the rotor slot 32 may be arranged so as to equalize the arrangement interval on the inner diameter side of the rotor 3 as described in the sixth embodiment. Can be easily accommodated.
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Abstract
Description
誘導機における振動は、誘導機の回転子と固定子との間の電磁加振力が誘導機の筐体と共振することで発生すると考えられる。特許文献1および特許文献2の誘導機では、回転子の磁石の位置を基準に、回転子スロットの配置を定めているが、このような方法では誘導機の電磁加振力の特定の共振周波数成分を低減できるに過ぎない。この結果、誘導機の振動を低減する効果については限定されてしまうという課題があった。
まず、本実施の形態1の誘導機1の構造について説明する。図1は、本発明の実施の形態1に係る回転子3を用いた誘導機1の断面例示図である。図1に示す誘導機1は、固定子2、および回転子3を備えて構成される。誘導機1は、例えば、電気自動車、ハイブリッド車などの駆動用モータとして使用される。
β=|βs±βr| (1)
βs=|As・Ns±p/2| (2)
βr=|Ar・Nr±p/2| (3)
ここで、As、Arは、どちらも任意の整数である。
β=|As・Ns+Ar・Nr+k・p|(k=-1、0、1) (4)
先の実施の形態1では、回転子スロット32の配置間隔を不等とする方法の一例として、回転子3の回転方向に対する回転子スロット32の配置間隔を凡そ等差的に変化させる方法を示した。しかしながら、前述のように、誘導機1の振動を低減させるためには、必ずしも、等差的に変化させる必要はなく、スロット不等配置周期内において回転子スロット32の配置間隔が不等となっていればよい。本実施の形態2では、回転子スロット32の配置間隔を不等とする方法の更なる別の実施例として、回転子スロット32の配置間隔を凡そ等比的に変化させることによっても、先の実施の形態1と同様に、誘導機1の振動を低減できる静粛性に優れたかご型回転子を得ることができることを示す。
先の実施の形態1、2では、極数p=8の場合の一例として、約数aが4、すなわちスロット不等配置周期=90°である場合について説明した。これに対して、本実施の形態3では、極数p=8の場合の約数aが4以外の場合、あるいは、固定子スロット22の個数Nsおよび回転子スロット32の個数Nrが異なる場合、あるいは、スロット不等配置周期内での回転子スロット32の対称性が異なる場合でも、先の実施の形態1、2と同様の効果が得られることを示す。
先の実施の形態1~3では、極数p=8の誘導機1の場合について説明した。これに対して、本実施の形態4では、極数p、固定子スロット22の個数Nsおよび回転子スロット32の個数Nrが先の実施の形態1~3とは異なる場合でも、先の実施の形態1~3と同様の効果が得られることを示す。
本実施の形態5では、回転子スロット32として種々の形状を用いた場合にも、先の実施の形態1~4と同様の効果が得られる点について説明する。先の実施の形態1~4では、回転子スロット32の形状が略長方形状の場合を例示していた。そこで、本実施の形態5では、回転子スロット32の形状が略長方形状と異なる場合についても検討し、回転子スロット32の形状の影響について説明する。
先の実施の形態1~5では、回転子スロット32が回転子3中心軸から径方向に向かって放射状に配置されている例を示した。これに対して、本実施の形態6では、回転子スロット32の内径側の位置を、回転子3の回転方向に変化させた場合でも、先の実施の形態1~5と同様の効果が得られることを示す。
本実施の形態7では、先の実施の形態1~5の回転子3の製造方法について説明する。
Claims (7)
- 複数の回転子スロットを外周部に有し、前記回転子スロットに収納された二次導体が、固定子の形成する回転磁場と相互作用することにより前記固定子内部で回転自在に回転する回転子を備えたかご型回転子であって、
前記複数の回転子スロットは、
同一の形状および大きさを有し、
前記回転子の回転1周期を前記固定子の極数pの約数aで等分したスロット不等配置周期(360/a)°内において、前記回転子の回転方向に対する配置間隔を不等としている
かご型回転子。 - 請求項1に記載のかご型回転子において、
前記約数aは、前記回転子の回転子スロット数をNr、前記固定子の固定子スロット数をNs、前記固定子の極数をp、AsおよびArを任意の整数、k=-1、0、1としたときに、下式で表現される空間次数β
β=|As・Ns-Ar・Nr+k・p|
のうちの、最小となる自然数である
かご型回転子。 - 請求項1または2に記載のかご型回転子において、
前記複数の回転子スロットは、前記スロット不等配置周期内において、前記スロット不等配置周期の角度中心であるスロット配置中心線を対称軸として鏡面対称となるように配置されている
かご型回転子。 - 請求項3に記載のかご型回転子において、
前記回転子スロットの配置間隔は、前記スロット不等配置周期内において、前記スロット配置中心線からの角度とともに単調減少または単調増加している
かご型回転子。 - 請求項1または2に記載のかご型回転子において、
前記回転子スロットの配置間隔は、前記スロット不等配置周期内において、前記回転子の回転方向の角度とともに単調減少または単調増加している
かご型回転子。 - 請求項4または5に記載のかご型回転子において、
前記回転子スロットの配置間隔は、前記スロット不等配置周期内において、前記スロット配置中心線からの角度とともに、または、前記回転子の回転方向の角度とともに、等差的または等比的に、単調減少または単調増加している
かご型回転子。 - 請求項1に記載のかご型回転子の製造方法であって、
前記固定子の外周部に形成される前記複数の回転子スロットの不等配置間隔を、記憶部に予め記憶しておくステップと、
前記複数の回転子スロットが形成される前の状態の回転子コアを、金型に対する初期位置に配置するステップと、
前記金型を用いて、前記回転子コアに前記回転子スロットを1つ形成する1スロット形成ステップと、
前記記憶部に記憶された前記不等配置間隔に基づいて、前記1スロット形成ステップにおいて形成した前記回転子スロットと次に形成する前記回転子スロットとの間の配置間隔に相当する角度だけ前記回転子コアを回転させる回転子コア回転ステップと、
前記回転子コアが1回転するまで前記1スロット形成ステップと前記回転子コア回転ステップとを繰り返すステップと
を有するかご型回転子の製造方法。
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US14/912,355 US10003244B2 (en) | 2013-09-02 | 2014-05-30 | Squirrel-cage rotor and method for manufacturing squirrel-cage rotor |
DE112014003995.0T DE112014003995T5 (de) | 2013-09-02 | 2014-05-30 | Käfigrotor und Verfahren zum Herstellen eines Käfigrotors |
CN201480048126.4A CN105493387B (zh) | 2013-09-02 | 2014-05-30 | 鼠笼式转子和鼠笼式转子的制造方法 |
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CN113057584B (zh) * | 2021-03-12 | 2023-01-20 | 中国科学院电工研究所 | 一种用于小动物在体检测的磁声耦合支具 |
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JPH07274457A (ja) * | 1994-03-30 | 1995-10-20 | Kusatsu Denki Kk | かご形回転子 |
JP2001037127A (ja) * | 1999-07-26 | 2001-02-09 | Toshiba Corp | 永久磁石形モータ |
JP2011166865A (ja) * | 2010-02-05 | 2011-08-25 | Mitsubishi Electric Corp | 単相誘導電動機及び密閉型圧縮機 |
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JP2003259579A (ja) | 2002-02-28 | 2003-09-12 | Tma Electric Corp | 永久磁石同期回転電機の回転子およびその製造方法 |
JP4528825B2 (ja) | 2007-12-21 | 2010-08-25 | 日立アプライアンス株式会社 | 自己始動型永久磁石同期電動機及びこれを用いた圧縮機 |
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JPH07274457A (ja) * | 1994-03-30 | 1995-10-20 | Kusatsu Denki Kk | かご形回転子 |
JP2001037127A (ja) * | 1999-07-26 | 2001-02-09 | Toshiba Corp | 永久磁石形モータ |
JP2011166865A (ja) * | 2010-02-05 | 2011-08-25 | Mitsubishi Electric Corp | 単相誘導電動機及び密閉型圧縮機 |
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US11101723B2 (en) | 2015-10-01 | 2021-08-24 | Mitsubishi Electric Corporation | Three-phase induction motor |
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DE112014003995T5 (de) | 2016-05-19 |
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