AU2017264461A1 - Hydraulic power generator and methods for the production and operation thereof - Google Patents

Hydraulic power generator and methods for the production and operation thereof Download PDF

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Publication number
AU2017264461A1
AU2017264461A1 AU2017264461A AU2017264461A AU2017264461A1 AU 2017264461 A1 AU2017264461 A1 AU 2017264461A1 AU 2017264461 A AU2017264461 A AU 2017264461A AU 2017264461 A AU2017264461 A AU 2017264461A AU 2017264461 A1 AU2017264461 A1 AU 2017264461A1
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AU
Australia
Prior art keywords
hydro generator
steel rings
rotor
running
hydro
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
AU2017264461A
Other versions
AU2017264461B2 (en
Inventor
Walter Harb
Mario HIMMELREICH
Fritz Neumayer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Andritz Hydro GmbH Austria
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Andritz Hydro GmbH Austria
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Andritz Hydro GmbH Austria filed Critical Andritz Hydro GmbH Austria
Publication of AU2017264461A1 publication Critical patent/AU2017264461A1/en
Application granted granted Critical
Publication of AU2017264461B2 publication Critical patent/AU2017264461B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
    • H02K15/024—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies with slots
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C3/00—Shafts; Axles; Cranks; Eccentrics
    • F16C3/04—Crankshafts, eccentric-shafts; Cranks, eccentrics
    • F16C3/06—Crankshafts
    • F16C3/10—Crankshafts assembled of several parts, e.g. by welding by crimping
    • F16C3/12—Crankshafts assembled of several parts, e.g. by welding by crimping releasably connected
    • 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
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/16—Stator cores with slots for windings
    • H02K1/165—Shape, form or location of the slots
    • 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
    • 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
    • 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
    • H02K1/32—Rotating parts of the magnetic circuit with channels or ducts for flow of cooling medium
    • 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
    • H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
    • 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
    • H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
    • H02K15/024—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies with slots
    • H02K15/026—Wound cores
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K19/00—Synchronous motors or generators
    • H02K19/16—Synchronous generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/46—Fastening of windings on the stator or rotor structure
    • H02K3/48—Fastening of windings on the stator or rotor structure in slots
    • H02K3/487—Slot-closing devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/003—Couplings; Details of shafts
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/14—Arrangements for cooling or ventilating wherein gaseous cooling medium circulates between the machine casing and a surrounding mantle
    • H02K9/16—Arrangements for cooling or ventilating wherein gaseous cooling medium circulates between the machine casing and a surrounding mantle wherein the cooling medium circulates through ducts or tubes within the casing

Abstract

The invention relates to a hydraulic power generator (1) designed as a synchronous electric machine which has an air-cooled rotor (2) and a stator (3) and which comprises at least eight poles (19) formed by the rotor windings (7). The invention also relates to a method for manufacturing the disclosed hydraulic power generator (1) as well as a method for operating same.

Description

The invention relates to a hydraulic power generator (1) designed as a synchronous electric machine which has an air-cooled rotor (2) and a stator (3) and which comprises at least eight poles (19) formed by the rotor windings (7). The invention also relates to a method for manufacturing the disclosed hydraulic power generator (1) as well as a method for operating same.
(57) Zusammenfassung: Den Gegenstand dieser Erfmdung bildet ein Wasserkraftgenerator (1), der als elektrische Synchronmaschine mit einem luftgekuhlten Rotor (2) und einem Stator (3) ausgebildet ist, mit mindestens acht Pole (19), die durch die Rotorwicklungen (7) gebildet werden. Den Gegenstand dieser Erfmdung bildet auch ein Verfahren zum Herstellen und Betreiben des erfindungsgemaBen Wasserkraftgeneraiors (1).
[Fortsetzung auf der nachsten Seite]
WO 2017/194379 Al IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIM
Veroffentlicht:
— mit internationalem Recherchenbericht (Artikel 21 Absatz 3)
HA401220 WO
HYDRO GENERATOR AND METHOD FOR ITS MANUFACTURE AND
OPERATION
The subject of the present invention is a hydro generator that is designed as an electrical, synchronous machine with an air-cooled rotor and a stator, with at least eight poles on the rotor, which are formed by the pole winding.
A method for manufacturing and operating the hydro generator according to the invention is also the subject of the present invention.
Hydro generators must always be operated with sufficient margin to the critical speeds (critical bending speeds), preferably below the first critical speed.
In the region of the critical speed, the forces of the rotating unbalanced mass set a part of or the entire machine vibrating in resonance. This can destroy the generator. The critical speed is largely determined by the bearing assembly, the rigidity of the rotating parts, and by their mass. If the rotor mass is increased, this reduces the first critical speed.
Operation of very large, high-speed hydro generators then becomes problematic. Due to the very large rotor mass, the first critical speed is comparatively low. In order to avoid coming close to the operating speed, efforts are made to keep the mass of the rotor low. Smaller rotor mass at the same output requires very efficient cooling, so rotors of this kind are equipped with water cooling.
However, water cooling is more complex and more expensive than simple air cooling.
HA401220 WO
Thus, the invention is based on the task of providing a hydro generator that can be fitted with air cooling for the rotor, but is still suitable for high-speed, highperformance plants (e.g. in a range higher than 500 MVA).
This object is accomplished by means of a hydro generator according to Claim 1. According to the invention, the selfsupporting rotor body does not have a central shaft, but consists of several forged steel rings connected to one another, where each steel ring has grooves to hold the rotor winding.
As a result of this construction without a central shaft, the rotor mass is reduced on the one hand and thus, the first critical speed is increased. On the other hand, the rotor construction with forged steel rings can form a particularly rigid rotor body, with the result that the first critical bending speed is also increased. In this way, a hydro generator of this kind can be operated at relatively high speeds for hydro generators, for example in the region of 400 to 900 r.p.m., in spite of its high output, and the rotor can be cooled with air.
The individual steel rings are connected or clamped to one another by means of bolts running in axial direction (= parallel to the axis of rotation). The steel rings can also be centered or aligned to one another with the aid of centering seats.
It is favorable if the two generator shafts are each connected to the steel rings or the rotor body by means of a transition piece, where the transition pieces can extend in axial direction so that they yield in radial direction.
HA401220 WO
This compensates for expansion of the steel rings caused by the operating temperature and, above all, by the centrifugal forces. These transition pieces can be bellshaped, cylindrical, or conical.
The structure formed by the steel rings has the advantage that radial cooling channels for the cooling air are formed easily by the grooves or recesses in the contact surfaces between the rings .
The rotor body formed by the steel rings should preferably have cooling channels running in axial direction (parallel to the axis of rotation) at the base of the grooves. The cooling air is then fed preferably through an opening in the face end into the inside of the rotor body and directed from there through the radial cooling channels and on to the channels running at the base of the grooves. The cooling air can then leave the rotor through radial bore holes in the winding. This provides good cooling of the rotor winding.
The axial cooling channels can either run continuously over the entire length of the rotor body, or they can also be sub-divided in longitudinal direction, thus distribution of the cooling air can be set to an optimum.
The invention also relates to a method for operating a hydro generator according to one of claims 1 to 14, where the hydro generator is operated below the first critical bending speed.
In addition, the invention relates to a method for manufacturing a hydro generator according to one of claims 1 to 14, where the grooves are already worked into the
HA401220 WO individual steel rings before they are joined together to form the rotor body.
The finish-machined steel rings can then be shipped to the final operating location and joined together there. This makes transport much easier.
In the following, an embodiment of the invention is described on the basis of drawings. In these drawings:
Fig. 1 shows a schematic longitudinal section through a hydro generator according to the invention;
Fig. 2 shows a schematic cross-section through the rotor;
Fig. 3 shows a detailed cut-out of the rotor in Fig. 2;
Figs. 4, 5, and 6 show detailed cut-outs of the rotor in Fig. 1;
Fig. 7 shows a view of the rotor;
The same reference numerals in the individual figures refer to the same plant components in each case.
Fig. 1 shows a sectional view along the axis of rotation 20 through an embodiment of the hydro generator 1 according to the invention without respective bearings for the shaft 11.
The vertically arranged rotor 2 is inside the stator 3, which is resting on a foundation 25. The rotor body 4 is formed by a large number of steel rings 5, 5a, 5b, which are clamped together by threaded bolts 8 and nuts 21. The individual steel rings 5, 5a, 5b are centered in relation
HA401220 WO to one another by centering shoulders 9, which engage the recesses (clearances) 10 in an adjacent steel ring 5, 5a, 5b.
On the outside of the rotor body 4 there are grooves 6 in the steel rings 5, 5a, 5b for the rotor winding 7. The winding head is stabilized via the end winding support (rotor retaining rings) 18.
The rotor body 4 is screwed to the shaft 11 at each end via a transition piece 12 in each case.
The transition piece 12 has a section 12a running essentially in radial direction y, which is connected to the shaft 11. In addition, the transition piece 12 comprises a second section 12c running in radial direction y, which is clamped between the two outer steel rings 5 and 5b, thus forming the connection between the transition piece 12 and the steel rings 5, 5a, 5b.
Between the two radial sections 5a and 5c there is a section 5b of the transition piece 12 running in axial direction x. The cylindrical section 12b enables a certain degree of yield in radial direction y. This can thus compensate for the centrifugal and heat expansion of the rotor body 4 in operation. Expansion can quite easily be in the range of several millimeters.
Cooling air can be directed into the inside of the rotor 22 through a face-end opening 14 in the rotor body 4 (in the transition piece 12a). This cooling air passes through cooling channels 17 running in radial direction y into the channels 16 at the base of the grooves running in axial direction x and cools down the rotor winding 7 via radial cooling channels 23 (shown in Fig. 3) in the winding 7. Finally, the cooling air leaves the rotor 2 at the air gap.
HA401220 WO
Figure 2 shows a cross-section through the rotor 2 of an 18-pole hydro generator 1. The individual grooves 6 in the steel ring and the bore holes 25 for the bolts 8 are shown here clearly.
Figure 3 provides a detailed view of the grooves 5 with the winding 7 from Figure 2 inserted. The cooling channels 16 running in axial direction at the base of the groove are shown here clearly. The cooling air can escape into the air gap between rotor 2 and stator 3 through radial cooling channels 23 in the winding 7 and the groove wedges 15.
Figure 4 shows the centering seat of two steel rings 5 centered to one another. The annular centering shoulder 9 of the steel ring 5 engages the recess 10 of an adjacent steel ring 5.
Figure 5 shows how the transition piece 12 is connected to the steel rings 5 and 5b. The section 12c running in radial direction y is clamped between the outermost steel ring 5b and the steel ring 5 by the bolts 8. In this area, cooling air is fed through the ring slot 24 between the outer steel ring 5b and the section 12b of the transition piece 12 running in axial direction x to the radial cooling channels 17 and thus enters the axial cooling channels 16 at the base of the groove.
Figure 6 shows a radial cooling channel 17 between two steel rings 5 on the inside of the rotor 22. These cooling channels 17 can be formed by radial grooves in the contact surfaces of the steel rings 5.
HA401220 WO
The structure of the end winding, which is stabilized by the rotor retaining rings 18 (end winding support), is shown in Figure 7. Here, the rotor winding 7 forms eighteen poles 19.
As the construction according to the invention is specially intended for very large and heavy hydro generators, the grooves 6 are preferably formed before assembly of the steel rings 5, 5a, 5b because smaller machining equipment can be used for this purpose.
HA401220 WO

Claims (17)

  1. Patent claims
    1. Hydro generator (1) designed as an electrical, synchronous machine with a stator (3) and an air-cooled rotor (2), where a pole winding on the rotor forms at least eight poles (19) characterized in that the self-supporting rotor body (3) does not have a central shaft, but consists of several forged steel rings (5, 5a, 5b) connected to one another, where each steel ring (5, 5a, 5b) has grooves into which the rotor winding (7) is placed.
  2. 2. Hydro generator (1) according to Claim 1, characterized in that the individual steel rings (5, 5a,
    5b) are connected to one another by means of bolts (8) running in axial direction (x).
  3. 3. Hydro generator (1) according to Claim 1 or 2, characterized in that the steel rings (5, 5a, 5b) have centering shoulders (9), each of which engage recesses (10) in an adjacent steel ring (5, 5a, 5b).
  4. 4. Hydro generator (1) according to one of Claims 1 to 3, characterized in that the steel rings (5a) that form the middle section of the rotor body (4) have a different inner diameter to the steel rings (5b) in the peripheral sections of the rotor, the inner diameter of the steel rings (5a) in the middle section preferably being larger than the inner diameter of the steel rings (5b) in the peripheral sections .
  5. 5. Hydro generator (1) according to one of Claims 1 to 4, characterized in that the steel rings (5b) in the peripheral sections are each connected to a shaft (11) via
    HA401220 WO a transition piece (12), where the transition pieces (12) extend in axial direction (x) so that they yield in radial direction (y).
  6. 6. Hydro generator (1) according to Claim 5, characterized in that the transition pieces (12) are bellshaped .
  7. 7. Hydro generator (1) according to Claim 5, characterized in that one section (12b) of the transition pieces (12) has a cylindrical or conical shape.
  8. 8. Hydro generator (1) according to one of Claims 5 to 7, characterized in that the transition pieces (12) are each secured between two steel rings (5, 5b).
  9. 9. Hydro generator (1) according to one of Claims 1 to 8, characterized in that the rotor body (4) formed by the steel rings (5, 5a, 5b) has cooling channels (17) running in radial direction (y).
  10. 10. Hydro generator (1) according to Claim 9, characterized in that the rotor body (4) formed by the steel rings (5, 5a, 5b) has cooling channels (16) running in axial direction (z) at the base of the grooves when the rotor winding (7) is installed, where the cooling channels (17) running in radial direction open into the cooling channels (16) running in axial direction.
  11. 11. Hydro generator (1) according to Claim 10, characterized in that the cooling channels (16) running in axial direction extend largely over the entire length of the grooves.
    HA401220 WO
  12. 12. Hydro generator (1) according to one of Claims 9 to
    11, characterized in that the rotor body (4) preferably has at least one opening (14) on the face end for supplying cooling air to the inside of the rotor (22).
  13. 13. Hydro generator (1) according to one of Claims 1 to
    12, characterized in that the stator is also air-cooled.
  14. 14. Hydro generator (1) according to one of Claims 1 to 12, characterized in that the stator is water-cooled.
  15. 15. Method for operating a hydro generator (1) according to one of Claims 1 to 14, characterized in that the hydro generator (1) is operated below its first critical bending speed.
  16. 16. Method for manufacturing a hydro generator (1) according to one of Claims 1 to 14, characterized in that the grooves (6) are worked into the individual steel rings (5, 5a, 5b) before the steel rings (5, 5a, 5b) are joined together to form the rotor body (4).
  17. 17. Method for assembly of a hydro generator (1) according to one of Claims 1 to 14, characterized in that the individual steel rings (5, 5a, 5b) are assembled at the hydro generator's (1) ultimate operating location.
    WO 2017/194379
    PCT/EP2017/060616
    1/4
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    WO 2017/194379
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    WO 2017/194379
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    Fig. 7
AU2017264461A 2016-05-09 2017-05-04 Hydraulic power generator and methods for the production and operation thereof Active AU2017264461B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ATA50421/2016A AT518592B1 (en) 2016-05-09 2016-05-09 HYDROPOWER GENERATOR AND METHOD FOR THE PRODUCTION AND OPERATION THEREOF
ATA50421/2016 2016-05-09
PCT/EP2017/060616 WO2017194379A1 (en) 2016-05-09 2017-05-04 Hydraulic power generator and methods for the production and operation thereof

Publications (2)

Publication Number Publication Date
AU2017264461A1 true AU2017264461A1 (en) 2018-11-01
AU2017264461B2 AU2017264461B2 (en) 2019-09-19

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ID=58701610

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Application Number Title Priority Date Filing Date
AU2017264461A Active AU2017264461B2 (en) 2016-05-09 2017-05-04 Hydraulic power generator and methods for the production and operation thereof

Country Status (8)

Country Link
EP (1) EP3455930B1 (en)
JP (1) JP6860592B2 (en)
CN (1) CN109155576B (en)
AT (1) AT518592B1 (en)
AU (1) AU2017264461B2 (en)
CL (1) CL2018003186A1 (en)
PE (1) PE20190299A1 (en)
WO (1) WO2017194379A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3726081B1 (en) * 2019-04-16 2023-10-25 GE Energy Power Conversion Technology Ltd Mechanical system and associated motorcompressor
CN111769674B (en) * 2020-05-18 2023-06-02 华为数字能源技术有限公司 Rotor, motor, power assembly and vehicle
CN112531959B (en) * 2020-12-04 2022-07-29 湖北梨威机械设备有限公司 Water-cooling type permanent magnet motor
CN116164969B (en) * 2023-04-25 2023-07-21 东方电气集团东方电机有限公司 Critical rotation speed detection method, device and storage medium

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Publication number Priority date Publication date Assignee Title
US3089049A (en) * 1959-05-12 1963-05-07 Gen Electric Canada Salient pole rotor construction
FR1307426A (en) * 1961-11-27 1962-10-26 Hydroelectric group
CH635711A5 (en) * 1978-09-19 1983-04-15 Evgeny Nikolaevich Vinogradov Rotor of a vertical hydroelectric power generator
SE428076B (en) * 1981-10-15 1983-05-30 Asea Ab ROTOR FOR A TURBOG GENERATOR
JPH067734B2 (en) * 1986-03-27 1994-01-26 株式会社日立製作所 Rotating machine rotor
JP2776905B2 (en) * 1989-08-16 1998-07-16 株式会社日立製作所 Variable speed generator
DE19513457A1 (en) * 1995-04-08 1996-10-10 Abb Management Ag Rotor of an electrical machine
US7546674B2 (en) * 2005-10-31 2009-06-16 Gm Global Technology Operations, Inc. Method of rotor assembly without the hub

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Publication number Publication date
CL2018003186A1 (en) 2019-01-11
JP2019515630A (en) 2019-06-06
CN109155576A (en) 2019-01-04
AT518592A1 (en) 2017-11-15
EP3455930A1 (en) 2019-03-20
EP3455930B1 (en) 2020-11-18
JP6860592B2 (en) 2021-04-14
PE20190299A1 (en) 2019-02-28
AU2017264461B2 (en) 2019-09-19
AT518592B1 (en) 2018-02-15
CN109155576B (en) 2022-06-07
WO2017194379A1 (en) 2017-11-16

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