CN108288901B - Each phase separated motor - Google Patents
Each phase separated motor Download PDFInfo
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- CN108288901B CN108288901B CN201810164371.1A CN201810164371A CN108288901B CN 108288901 B CN108288901 B CN 108288901B CN 201810164371 A CN201810164371 A CN 201810164371A CN 108288901 B CN108288901 B CN 108288901B
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- 108700041286 delta Proteins 0.000 claims abstract description 21
- 238000004804 winding Methods 0.000 claims description 12
- 230000016507 interphase Effects 0.000 claims description 6
- 239000004020 conductor Substances 0.000 claims description 5
- 238000000819 phase cycle Methods 0.000 claims description 4
- 230000005611 electricity Effects 0.000 claims description 2
- 230000018199 S phase Effects 0.000 claims 1
- 230000010349 pulsation Effects 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000010923 batch production Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000012071 phase Substances 0.000 description 101
- 238000010586 diagram Methods 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000005457 optimization Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 101100134058 Caenorhabditis elegans nth-1 gene Proteins 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000008385 outer phase Substances 0.000 description 2
- 238000002553 single reaction monitoring Methods 0.000 description 2
- 238000013426 sirius red morphometry Methods 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000008384 inner phase Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910001172 neodymium magnet Inorganic materials 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/02—Details
-
- 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
- H02K3/18—Windings for salient poles
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
- Synchronous Machinery (AREA)
Abstract
The invention discloses a motor with separated phases, which comprises a plurality of phase sections which are arranged in parallel and have the phase number more than or equal to 2, wherein each phase section comprises a stator and a rotor which are coaxially arranged; a plurality of salient poles are uniformly arranged on the stator and the rotor; a fixed offset angle delta 1 is arranged between salient poles of each phase of stator, and an angular offset angle delta+delta 1 is arranged between salient poles of each phase of rotor; wherein, delta 1 is more than or equal to 0 and less than or equal to lambda/2; the number of convex poles on each phase section stator/rotor is p, and the interelectrode included angle lambda=360°/p; the phase number is m & gt2, and the angular offset angle delta=lambda/m. The invention can increase the phase number to more than tens of phases according to the requirement, and the phase number with torque reserve is increased along with the increase of the phase number, thereby reducing the pulsation torque and noise and increasing the fault tolerance of an electric control system; the stators and the rotors of each phase are in the same section, so that the stator and the rotor can be flexibly assembled and are beneficial to multi-specification batch production. And a motor with higher power is convenient to manufacture.
Description
Technical Field
The invention belongs to the technical field of motors, and particularly relates to a motor with separated phases.
Background
Switched reluctance motor Switched Reluctance Motor, SRM for short. The structure was proposed by Robert Davidson, scotland, as early as 1838, but was not actually used until power electronics and appropriate components were not present. The construction and control theory of SRM was reported in detail in the 70 s of the 20 th century, from which great developments were made, especially in the field of control technology.
Two basic features of SRM: 1. switch-the supply of the motor windings must operate in a continuous switching mode. Thus, the development of new power semiconductors and intelligent control devices has only made SRMs a basis for development. 2. Reluctance—torque is produced by magnetic attraction between salient poles with specific angular positions on the stator and rotor, manifesting as reluctance variation.
SRM is a double salient structure, the number of rotor and stator poles is unequal, and its essential feature is that the number of rotor poles is less than the number of stator poles. There may be a variety of different phase number configurations depending on the number of rotor and stator poles, such as 6 poles for motor stators and 4 poles for rotors, known as 6/4 pole SRMs. There are three, four, five phases, 6/4, 8/6, 10/8, 12/8, 16/12 pole SRM.
Both the doubly salient permanent magnet motor and the permanent magnet generator are based on SRM architecture, and developed after the advent of NdFeB.
The existing SRM comprises a rotor and a stator core which are formed by pressing silicon steel sheets with good magnetic conductivity, wherein the rotor core has no winding, and concentrated windings are arranged on protruding poles of the stator. The rotor has no winding or permanent magnet, and has high torque/inertia ratio and large starting torque, so the rotor is suitable for frequent starting occasions; as with a conventional motor, there is a very small air gap between the rotor and stator. The special geometry makes it more torque ripple and noise, which is the biggest drawback of SRM application limitation.
Chinese patent publication No. CN107181382a published in 2017, 09 and 19 proposes a staggered-angle stator magnetism-isolated axial permanent-magnet auxiliary doubly salient motor. The scheme of adopting circumferential stagger angle installation of the rotors at two sides is provided, so that the step angle is reduced, and the torque smoothness is improved. There is still no significant improvement in the number of rotors being less than the number of stators, and the 3 phases being circumferentially alternating. As regards its permanent-magnet-assisted design, the negative effects of reducing the pulsating torque and of the electrical control measures are more questionable.
Chinese patent publication No. CN105356629a published 24 month 02 in 2016 proposes a high fault tolerance modular switched reluctance motor and its driving control system, which belongs to the class of segmented SRM, and besides segmenting the rotor and the stator, the number of the rotor is still less than that of the stator, and the 3 phases are alternately arranged along the circumference. There remains a drawback to reducing torque ripple and control flexibility.
The state of the art in this field is that scholars at home and abroad are conducting a great deal of research on SRM from the aspects of motor body design and control, in order to reduce the torque ripple of the motor and increase the efficiency and power density of the motor. In terms of design, the optimization method of the SRM can be divided into 2 types, namely 1, the optimization method mainly starts from the aspects of pole number selection, pole arc width optimization, winding turns optimization, soft magnetic material selection and the like of the motor; the torque distribution, the direct instantaneous torque control and the intelligent control are adopted in the control aspect to reduce the torque pulsation and the noise.
Disclosure of Invention
The invention aims to provide a motor with separated phases, which solves the problems that the existing switched reluctance motor still has larger torque pulsation and noise; the invention reduces pulsation torque and noise by optimizing topological structure of polar and phase layout.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
each phase separated motor comprises a plurality of phase sections which are arranged in parallel and have the phase number more than or equal to 2, and each phase section comprises a stator and a rotor which are coaxially arranged; a plurality of salient poles are uniformly arranged on the stator, and a plurality of salient poles are uniformly arranged on the rotor; in all phases, the salient poles of the stator and the salient poles of the rotor are equal in number; a fixed offset angle delta 1 is arranged between salient poles of each phase of stator, and an angular offset angle delta+delta 1 is arranged between salient poles of each phase of rotor; wherein, delta 1 is more than or equal to 0 and less than or equal to lambda/2; the number of convex poles on each phase section stator/rotor is p, and the interelectrode included angle lambda=360°/p; the phase number is m & gt2, and the angular offset angle delta=lambda/m.
Further, windings on adjacent salient poles in each phase of stator are wound in opposite directions to form a N, S inter-phase salient pole arrangement.
Further, a phase-to-phase isolating ring is arranged between adjacent stators, and the isolating ring is made of non-magnetic conductive materials.
Further, a phase-to-phase isolating ring is arranged between adjacent rotors, and the isolating ring is made of non-magnetic conductive materials.
Further, each phase of stator/rotor is arranged on the outer ring, and the rotor/stator is concentrically arranged on the inner ring.
Further, each phase section is sequentially arranged on the same axis; the salient pole angle difference value of the stator of the nth phase and the stator of the n-1 phase is delta 1, and the salient pole angle difference value of the rotor of the nth phase and the rotor of the n-1 phase is delta+delta 1; n is more than or equal to 2 and less than or equal to m.
Further, the phase sequence n is the power-on time sequence, and is irrelevant to the mechanical position of each phase section.
Further, the mechanical connection parts between the phase sections are isolated by adopting non-magnetic conductive materials.
Furthermore, inter-pole permanent magnets are arranged between salient poles of the stator to form the permanent magnet motor with each phase separated.
Further, the opposite faces of the permanent magnets between adjacent poles have the same magnetism.
Furthermore, inter-pole permanent magnets are arranged between salient poles of the stator, and the rotor is connected with a driving device to form a permanent magnet generator with each phase separately arranged; the rotor can rotate to generate electricity under the drive of the driving device.
Furthermore, inter-pole permanent magnets are arranged among salient poles of part of the stators, and the opposite surface polarities of adjacent inter-pole permanent magnets are the same; and no interelectrode permanent magnet is arranged between salient poles of part of the stators to form the hybrid type motor with each phase separated.
Compared with the prior art, the invention has the following beneficial effects:
the invention can increase the phase number to more than tens of phases as required, and the phase number with torque reserve is increased along with the increase of the phase number, thereby reducing the pulsation torque and noise and increasing the fault tolerance of an electric control system.
The stators and the rotors of each phase are in the same section, so that the stator and the rotor can be flexibly assembled and are beneficial to multi-specification batch production.
The magnetic force lines are closed between the adjacent magnetic poles, so that the path is reduced; the interphase has no bypass flux linkage. Therefore, the iron loss is reduced and the efficiency is improved.
The number of poles can be increased or decreased according to the requirement, and the number of phases and the number of poles can be independently selected without being limited by the proportional relation of the prior art; the requirement on an electric control system is reduced.
The number of poles of the rotor is equal to that of the stator, so that the utilization rate of the rotor is improved.
And a motor with higher power is convenient to manufacture.
Drawings
FIG. 1 is a 3D schematic diagram of an outer stator multiphase application of embodiment 1 of a motor of the present invention with separate phases;
FIG. 2 is a 3D schematic diagram of an A-phase salient pole stator and salient pole rotor of an inner rotor of a motor with separated phases;
FIG. 3 is a schematic diagram of the pole polarity generated by the A-phase stator winding applied to the 8 poles of the inner rotor of the motor of each phase of the present invention;
FIG. 4-1 is a schematic diagram of a rotor bias tiling for each phase of the motor of example 2 of the present invention with corresponding rotor 8 poles 5;
fig. 4-2 is a schematic illustration of stator offset tiling for each phase separated motor embodiment 3 of the present invention with corresponding rotor 8 poles 5;
fig. 5 is a schematic diagram of the polarity of the magnetic poles generated by the a-phase stator coil for the outer rotor 8-pole multiphase application of the motor example 4 of each phase of the present invention.
FIG. 6 is a 3D schematic diagram of a motor embodiment 5 of the invention with separated phases, including inter-pole permanent magnets, 8-pole multiphase application A-phase salient pole stator, salient pole rotor;
fig. 7 is a front view of fig. 6, with pole-to-pole permanent magnet polarity labels schematically.
Fig. 8 is a 3D schematic of an embodiment 6 of the motor of the present invention with each phase separated, and an application of the phase 6 with an inter-pole permanent magnet and 8 poles.
Fig. 9 fig. 8 is a schematic tiling view.
In the figure: 1: outer stator, 11: inter-pole permanent magnet, 12: outer phase isolating ring, 2: inner rotor, 22: an inner inter-phase spacer ring. N, S represents the pole polarity of the windings provided on the stator poles when driven, or the pole polarity of the inter-pole permanent magnets. A. B, C, D, E, F, G, H are the numbers of the phases driven in time series.
Detailed Description
Referring to fig. 1, the motor of the present invention includes a plurality of phases, each phase section including a stator and a rotor concentrically arranged; a plurality of salient poles are uniformly arranged on the stator, and a plurality of salient poles are uniformly arranged on the rotor; in all phases, the salient poles of the stator and the salient poles of the rotor are equal in number; a fixed offset angle delta 1 is arranged between salient poles of each phase of stator, and an angular offset angle delta+delta 1 is arranged between salient poles of each phase of rotor; wherein, delta 1 is more than or equal to 0 and less than or equal to lambda/2;
the invention relates to a motor with separated phases, which can set the phase numbers according to the needs, and the rotor and the stator are arranged in sections according to the phase numbers, wherein each phase is respectively positioned in one section.
The following description will be given with the stator as the outer stator 1 and the rotor as the inner rotor 2. Of course, the invention can also be that the stator is fixed on the inner ring and the rotor is fixed on the outer ring.
An outer phase isolating ring 12 is arranged between the outer stators 1 of adjacent phases; an inner phase spacer ring 22 is provided between the inner rotors 2 of the adjacent phases.
Referring to fig. 4-1, in the inner rotor 2, "angular offset angle δ" is sequentially set between the outer salient poles of each phase, and the inner salient poles of the outer stator 1 of each phase have no offset angle (δ1=0). Alternatively, as shown in fig. 4-2, in the outer stator 1, an "angular offset angle δ" is provided in order between the inner salient poles of the respective phases. If the number of poles is p and the number of phases is m, the inter-pole angle is λ=360°/p. As in the examples of fig. 4-1 or 4-2, p=8, m=5. The inter-pole angle is λ=360°/8=45°, the angular offset angle δ=λ/m=45°/5=9°.
If the salient poles of the stators of each phase are provided with fixed deflection angles delta 1, the salient poles of the rotors of each phase are provided with angular deflection angles delta+delta 1, delta 1 is more than or equal to 0 and less than or equal to lambda/2, and the interelectrode included angle lambda=360 DEG/p; p is the salient pole number on each phase section stator/rotor; the number of phases is m, the angular offset angle delta=λ/m.
Each phase section is coaxially arranged in turn according to the angle difference value, and the offset angle and the angular offset angle between adjacent phase sections are fixed; the salient pole angle difference between the nth phase section and the nth-1 phase section stator is delta 1, and the salient pole angle difference between the nth phase section and the nth-1 phase section rotor is delta+delta 1; n is more than or equal to 2 and less than or equal to m.
The phase sequence n is the power-on time sequence and is irrelevant to the mechanical position of each phase section.
And judging the angular position between the rotor salient pole and the stator salient pole according to the required rotation direction, defining a phase sequence according to the principle of minimum magnetic resistance, and controlling the stator armature in the corresponding phase section to sequentially circularly electrify and work, so that the motor can be driven to rotate continuously.
Taking phase A as an example, the A+ windings and the A-windings are arranged at intervals to form a N, S interphase salient pole arrangement, and the iron loss is reduced.
The interphase isolating ring is used for axially yielding the armature winding.
4-1, the driving motor rotates anticlockwise, at the moment, the outer stator salient pole of the phase A is aligned with the inner rotor salient pole of the phase A, the phase A is powered off in advance, meanwhile, the phase B is powered on, the phase C is used as a main driving phase, the phase A is used as a secondary driving phase at the previous moment, the phase B is used as a secondary driving phase, and the phase C is used as a torque reserve phase; with this circulation, the drive motor remains rotated counterclockwise.
As shown in fig. 6 to 9, since the inter-pole permanent magnet 11 is interposed, the a-phase outer stator salient poles are aligned with the a-phase inner rotor salient poles at this moment, the a-phase power supply is turned off in advance, meanwhile, the B-phase power supply is used as the main driving phase, and the C-phase power supply is used as the auxiliary driving phase, and the electromagnetic polarity generated by the power supply on each salient pole is the same as the polarity of the inter-pole permanent magnet, so that the attraction force of the salient poles to the corresponding rotor is enhanced; the E phase and the F phase generate negative torque due to the magnetic force of the permanent magnets, and the power supply makes the polarity of the electromagnetic generated by the electromagnetic action on each salient pole opposite to the polarity of the interelectrode permanent magnet, so that the attraction of the interelectrode permanent magnet to the salient pole of the corresponding rotor is weakened. With this circulation, the drive motor remains rotated counterclockwise.
As shown in fig. 6 to 9, when the external power drives the rotor to rotate, the 6-phase 8-pole mechanism can form a permanent magnet generator.
Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described specific embodiments. Those skilled in the art, having the benefit of this disclosure, may effect numerous forms of the invention without departing from the scope of the invention as claimed.
Claims (10)
1. Each phase separated motor is characterized by comprising a plurality of phase sections which are arranged in parallel and have the phase number more than or equal to 2, wherein each phase section comprises a stator and a rotor which are coaxially arranged;
a plurality of salient poles are uniformly arranged on the stator, and a plurality of salient poles are uniformly arranged on the rotor; in all phases, the salient poles of the stator and the salient poles of the rotor are equal in number;
a fixed offset angle delta 1 is arranged between salient poles of each phase of stator, and an angular offset angle delta+delta 1 is arranged between salient poles of each phase of rotor; wherein, delta 1 is more than or equal to 0 and less than or equal to lambda/2;
the number of convex poles on each phase section stator/rotor is p, and the interelectrode included angle lambda=360°/p; the phase number is m & gt2, and the angular offset angle delta=lambda/m.
2. A phase-separated machine as claimed in claim 1, wherein windings on adjacent poles in the stator of each phase are wound in opposite directions to form a N, S phase salient pole arrangement.
3. The motor of claim 1, wherein phase-separated rings are provided between adjacent stators and between adjacent rotors; the interphase isolating ring is made of non-magnetic conductive materials.
4. The motor of claim 1, wherein the stator/rotor of each phase is disposed on an outer ring and the rotor/stator is disposed concentrically on an inner ring.
5. A motor as claimed in claim 1, wherein the phase sections are arranged in sequence on the same axis; the salient pole angle difference value of the stator of the nth phase and the stator of the n-1 phase is delta 1, and the salient pole angle difference value of the rotor of the nth phase and the rotor of the n-1 phase is delta+delta 1; n is more than or equal to 2 and less than or equal to m.
6. The motor of claim 5, wherein the phase sequence n is an energization sequence independent of a mechanical position of each phase segment.
7. The motor of claim 1, wherein inter-pole permanent magnets are arranged between salient poles of the stator, and opposite faces of adjacent inter-pole permanent magnets have the same polarity; forming the permanent magnet motor with each phase separated.
8. A motor according to any one of claims 1 to 6, wherein inter-pole permanent magnets are provided between salient poles of the stator, and opposite faces of adjacent inter-pole permanent magnets have the same polarity; the rotor is connected with the driving device to form a permanent magnet generator with each phase separately; the rotor can rotate to generate electricity under the drive of the driving device.
9. A motor according to any one of claims 1 to 6, wherein inter-pole permanent magnets are provided between salient poles of part of the stator, and the polarities of the faces of adjacent inter-pole permanent magnets are the same; forming a hybrid type motor with each phase separated.
10. A motor as claimed in claim 1, wherein the mechanical connection between the phase sections is isolated by a non-magnetically conductive material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810164371.1A CN108288901B (en) | 2018-02-27 | 2018-02-27 | Each phase separated motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810164371.1A CN108288901B (en) | 2018-02-27 | 2018-02-27 | Each phase separated motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108288901A CN108288901A (en) | 2018-07-17 |
| CN108288901B true CN108288901B (en) | 2024-04-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810164371.1A Active CN108288901B (en) | 2018-02-27 | 2018-02-27 | Each phase separated motor |
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| Country | Link |
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| CN (1) | CN108288901B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08103043A (en) * | 1994-10-03 | 1996-04-16 | Hitachi Ltd | Armature core |
| WO2015074571A1 (en) * | 2013-11-20 | 2015-05-28 | 戴珊珊 | Ac permanent-magnet switched reluctance electric motor |
| CN105932793A (en) * | 2016-06-08 | 2016-09-07 | 华中科技大学 | Doubly salient permanent magnet synchronous motor with unequally spaced stator poles |
| CN106532999A (en) * | 2015-09-10 | 2017-03-22 | 德昌电机(深圳)有限公司 | Single-phase permanent magnet motor |
| CN106740248A (en) * | 2017-01-24 | 2017-05-31 | 株洲中车时代电气股份有限公司 | A kind of tractive power supply system of high-speed magnetic levitation traffic system and its train |
| CN106849421A (en) * | 2017-03-20 | 2017-06-13 | 山东理工大学 | The wheel hub electric motor of electric vehicle of central excitation |
| CN107425688A (en) * | 2017-06-28 | 2017-12-01 | 华中科技大学 | A kind of permanent magnet is between stator poles and the double salient-pole electric machine of rotor interpolar |
| CN208337374U (en) * | 2018-02-27 | 2019-01-04 | 马小安 | A kind of each mutually separation formula motor |
-
2018
- 2018-02-27 CN CN201810164371.1A patent/CN108288901B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08103043A (en) * | 1994-10-03 | 1996-04-16 | Hitachi Ltd | Armature core |
| WO2015074571A1 (en) * | 2013-11-20 | 2015-05-28 | 戴珊珊 | Ac permanent-magnet switched reluctance electric motor |
| CN106532999A (en) * | 2015-09-10 | 2017-03-22 | 德昌电机(深圳)有限公司 | Single-phase permanent magnet motor |
| CN105932793A (en) * | 2016-06-08 | 2016-09-07 | 华中科技大学 | Doubly salient permanent magnet synchronous motor with unequally spaced stator poles |
| CN106740248A (en) * | 2017-01-24 | 2017-05-31 | 株洲中车时代电气股份有限公司 | A kind of tractive power supply system of high-speed magnetic levitation traffic system and its train |
| CN106849421A (en) * | 2017-03-20 | 2017-06-13 | 山东理工大学 | The wheel hub electric motor of electric vehicle of central excitation |
| CN107425688A (en) * | 2017-06-28 | 2017-12-01 | 华中科技大学 | A kind of permanent magnet is between stator poles and the double salient-pole electric machine of rotor interpolar |
| CN208337374U (en) * | 2018-02-27 | 2019-01-04 | 马小安 | A kind of each mutually separation formula motor |
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| CN108288901A (en) | 2018-07-17 |
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