EP4338260A1 - Bobinage en fonction d'une typologie d'une machine électrique tournante synchrone à aimant pour dispositif mobile à autopropulsion - Google Patents
Bobinage en fonction d'une typologie d'une machine électrique tournante synchrone à aimant pour dispositif mobile à autopropulsionInfo
- Publication number
- EP4338260A1 EP4338260A1 EP22727921.3A EP22727921A EP4338260A1 EP 4338260 A1 EP4338260 A1 EP 4338260A1 EP 22727921 A EP22727921 A EP 22727921A EP 4338260 A1 EP4338260 A1 EP 4338260A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- machine
- phase
- turns
- winding
- conductors
- 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.)
- Pending
Links
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
- H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/0094—Structural association with other electrical or electronic devices
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/04—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for rectification
- H02K11/049—Rectifiers associated with stationary parts, e.g. stator cores
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/30—Structural association with control circuits or drive circuits
- H02K11/33—Drive circuits, e.g. power electronics
-
- 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
- H02K3/28—Layout of windings or of connections between windings
-
- 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 technical field of the invention is that of rotating electrical machines such as an alternator-starter or a reversible machine or an electric motor for a self-propelled mobile device.
- self-propelled mobile device we mean a vehicle for transporting goods or people, which move autonomously or an object which moves autonomously, such as a drone.
- the invention relates more particularly to the optimization of the winding according to a type of rotating electrical machine with synchronous magnet to be supplied by an on-board network having a nominal voltage of between 48 volts and 600 volts.
- a rotating electrical machine comprises a shaft integral with a rotor and a stator, for example arranged so as to surround the rotor.
- the rotor and the stator form an electric motor and cooperate through a magnetic field.
- the rotor is equipped with permanent magnets and the stator with an electric winding.
- the stator is usually the armature (seat of the power transformation).
- the stator consists of a three-phase winding generally coupled in star or delta, composed of several electrical phases. The windings are inserted into notches within the steel sheet yoke.
- the inductor is usually the rotor, which includes a winding or permanent magnets to create the magnetic field. Electric machines with magnet rotors are used here because these rotors have fewer losses, do not need windings or brushes, can be lighter and allow more flux to the rotor with a gain in size. .
- the market for new self-propelled mobile devices for example in the field of rolling vehicles, is very fluctuating and imposes different characteristics which make it more complex to define the standards in order to reduce the manufacturing cost.
- the different characteristics imposed can be the size, diameter/length, the mechanical power at different speeds (different torque ranges and rotational speeds) according to two operating modes as well as the nominal continuous voltage or current of the power supply of the electric machine imposed on it.
- the nominal supply voltage of the self-propelled mobile device can be between 48 volts and very high voltages such as 350 volts.
- the electrical machine therefore further comprises an inverter/rectifier to transform the direct current into alternating current of a multi-phase system. Current can be cut out for power control of the machine's electric motor.
- the electric winding is supplied with electric current via the inverter/rectifier, so as to generate a rotating magnetic field at the level of the electric winding, in order to drive the rotor rotating synchronously with this rotating field when the rotor is equipped with magnets or coils creating the excitation flux or asynchronously if the rotor is formed of squirrel cages.
- the rotor In the second mode of operation called generator mode, the rotor is driven in rotation via the drive means (thermal engine or/and wheel, propeller) of the self-propelled mobile device (for example in the event of braking recuperative) and the rotation of the rotor equipped with magnets or excitation coils generates a rotating magnetic field at the level of the electric winding of the stator which is transformed into direct current by the inverter/rectifier which comes to recharge the battery of the vehicle or to supply electric loads [0012] Depending on the use of the electric machine, it can be sized in motor mode, to start a heat engine and/or to provide a "boost", that is to say help the heat engine to acceleration or climbing a slope of the vehicle and/or to move the vehicle forward in 100% electric mode. [0013] In the case of a start (thermal engine or directly from the vehicle in 100% electric mode), the machine must be able to provide greater torque than in the event of a boost or an increase in speed in 100% mode. electric.
- a winding comprises a group of phases, each phase comprises at least one coil having turns inserted in the notches of the stator.
- a phase can have several coils connected in parallel or in series.
- Each phase group forms a multi-phase, often three-phase system.
- Electric machines are designed according to their type of delta or star coupling. Indeed, the winding will be designed according to the output voltage of the inverter/rectifier of the machine which will be applied differently between one end of a phase and a neutral point or between the two ends of a phase.
- star coupling involves connecting one end of a phase coil to one end of the inverter/rectifier then the other end of all the phase coils to a neutral point connecting the phases between they.
- the voltage across a phase is then reduced (divided by root of three times the voltage between two phases or voltage applied to the inverter/rectifier).
- the winding is designed so that all the coils of one phase are connected at its two ends to the inverter/rectifier and on the other hand at one end of a coil of another phase.
- the phases are then connected in series forming a triangle. This implies that each phase receives the voltage applied by the inverter/rectifier.
- a winding in delta coupling will be different from a winding in star connection.
- the invention offers a solution to the problems mentioned above, by allowing standardization of synchronous electrical machines by adapting the number of turns per phase.
- the invention aims to adapt the number of turns of a phase, in order to optimize the electrical machine by responding to a compromise between the limitation of the torque drop at high speed and at low speed.
- One aspect of the invention relates to a permanent magnet synchronous rotating electrical machine for a self-propelled mobile device comprising a magnet rotor having a number P of pairs of poles, a stator comprising slots and a winding comprising at least three phases, each phase comprises several turns, a turn is formed of a succession of electrical conductors housed in different notches and electrically connected to each other, each notch housing several electrical conductors, an inverter/rectifier adapted in motor mode to transform a voltage of continuous nominal input comprised between a voltage of 48 Volts and a voltage of 600 Volts in alternating supply voltages of a multi-phase system for each phase of the winding and adapted in alternator mode to provide a continuous output voltage comprised between a voltage of 48Volts and a voltage of 600 Volts.
- the winding is of the type in which the number of turns N in the stator per phase is equal to the number of conductors in a slot, multiplied by the number P of pairs of poles multiplied by the number of slots by pole and per phase, the whole divided by the number of electrical paths in parallel of the conductors for a phase in a slot or/and divided by the square root of three if the winding is connected in a triangle, characterized in that the number of turns N per phase in the stator is between 9 and 20.
- the electrical machine having a sizing imposed by the self-propelled mobile device as well as a maximum inverter/rectifier current imposed for cost and sizing reasons, the choice of a number of turns N per phase between 9 and 20 allows to optimize the machine to meet a compromise between the limitation of the torque drop at high speed and at low speed of a synchronous machine to be supplied between a nominal voltage between 48 volts and a very high voltage. This optimization also makes it possible to obtain maximum power from the electric machine. Indeed, the number of turns N per phase is directly linked to the numbers of phases, poles and conductors in a slot. The number of turns per phase is also a function of the coupling, of the nominal voltage of the inverter/rectifier.
- the synchronous electric machine has for example a power drop when the machine operates at high speeds, less than for an asynchronous machine. This makes it possible, for example, to ensure speed synchronization for the hybridization of a gearbox. Maintaining power at all speeds makes it possible to go from low speed to high speed in a short time.
- a low speed range corresponds to a speed between 0 and 4000 nominal rpm and a high speed corresponds to a speed greater than 4000 rpm and in particular between 4000 rpm and 20000 rpm.
- the number of turns per phase is related to the short-circuit current which is related to the mechanical power of the machine.
- the short-circuit current is the maximum current acceptable by the machine in an area of iso mechanical power. This current is stable for a number of revolutions of the rotor, for example 1000 rpm for a synchronous machine of 15 kW, 48 volts. If the number N of turns per phase is greater than 20, the mechanical power will therefore be insufficient at high speed and in particular for a 48 volt machine (nominal DC voltage at the terminals of the inverter/rectifier). If the number N is greater than 16 the mechanical power will be insufficient at high speed.
- the electromotive force EMF of the machine is therefore proportional to the number of turns per phase of the machine.
- This range of number of turns between 9 and 20 per phase therefore makes it possible to have a balanced synchronous machine: optimum torque and mechanical power for a given size and a minimum inverter/rectifier current.
- the number of electrical paths in parallel is in particular the number of groups of turns connected in parallel to each other. Each group can comprise a single turn or several turns connected in series.
- the electrical machine according to one aspect of the invention may have one or more additional characteristics among the following, considered individually or according to all technically possible combinations.
- the electrical conductors housed in a notch are branches of a pin, the pins being electrically connected by their free ends in pairs to form the winding. This makes it possible to increase the copper content in a notch and/or reduce the difficulty of winding compared to wired winding using a needle device guiding the winding of the same electric wire around each tooth. radial to form successive turns. Such a winding is said to be concentric winding or with stator turns distributed continuously in the slots.
- each notch houses between 2 and 25 electrical conductors.
- each notch accommodates between 2 and 4 electrical conductors.
- the use of 2 or 4 conductors per slot limits joule losses at high speeds.
- the same notch can accommodate electrical conductors belonging to the same phase or to several phases.
- the number of turns N in the stator per phase is between 9 and 18, and in particular between 9 and 16, and the inverter/rectifier has a nominal voltage of 48 volts.
- the number of turns per phase is between 11 and 12, the number of phases is 6, the number P of pairs of poles is between 5 and 6 and the section of the conductors is sized in particular so that the resistance between two phase outputs is less than 13 milli ohms.
- the total section of the conductors in a slot is between 18.2 mm 2 and 27.5 mm 2 .
- the dimensions of a conductor are included between 1.9 mm and 3.5 mm in length and between 1.9 mm and 5.3 mm in width.
- the conductors are made of copper and are pins.
- a nominal power of the machine is between 15 kW and 25 kW.
- the number of turns per phase is between 13 and 18, the number of phases is 3 or 6, the number of pairs of poles is between 5 and 6 and the section of the conductors is in particular sized so that the resistance between two phase outputs is less than 13 milli ohms.
- the total section of the conductors in a slot is between 19.8 mm 2 and 24.3 mm 2 .
- the dimension of a conductor is between 0.85 mm and 0.97 mm in diameter.
- the conductors are made of copper and are wound wire. Indeed, it has been noticed that for a wire winding of a 48 volt machine, the number of turns per phase is greater than in hairpin to optimize it because the copper rate in a notch is lower than that of the pins.
- the number of turns per phase is between 16 and 18, the number of phases is 3 and the number P of pole pairs is between 5 and 6.
- the number of turns per phase is between 16 and 20 and the inverter/rectifier has a nominal DC voltage of between 300 and 400 volts.
- the winding is star-coupled.
- the winding is delta-coupled.
- each phase comprises several electrical coils each comprising at least one turn, the coils being able to be connected in series or in parallel with each other.
- the rotor comprises a rotor body and a plurality of permanent magnets housed in said body.
- the inverter/rectifier has a continuous nominal voltage of 48 volts and the electrical machine has a performance ratio equal to the peak torque in Nm multiplied by the peak mechanical power in Watt divided by an equal value at the peak current in Amperes multiplied by the number of turns per phase N multiplied by the external diameter of the machine in millimeters multiplied by the length of the machine in millimeters and in that the performance ratio is greater than 0.02. It will be understood that the higher the ratio, the more the machine is optimized.
- the mechanical power is between 8 kW and 50 kW and the inverter/rectifier is suitable for a continuous nominal input voltage of 48 volts.
- the mechanical power is between 51 kW and 150 kW and the inverter/rectifier is suitable for a continuous nominal input voltage greater than 300 volts.
- FIG.1 shows an example table of an optimized electrical machine. The figure is presented for information only and in no way limiting the invention.
- the invention relates to a synchronous rotating electrical machine with permanent magnets for a self-propelled mobile device.
- Figure 1 shows a table of characteristics of different machines.
- the electrical machines 1, 2, 3, 4, 5, 6 each comprise a magnet rotor forming an inductor, the number of magnets of which forms a number P of pairs of poles. Machines 1, 3 and 4 each have 12 poles, while machine 2 has 10 poles and machines 5 and 6 each have 8 poles.
- the electric machines 1, 2, 3, 4, 5, 6 each comprise a stator forming an armature.
- the stator comprises a yoke forming a part of revolution around an axis passing through the center of the stator.
- the yoke has radial teeth, extending radially towards the center of the stator and around which the electrical winding is made. More particularly, the radial teeth delimit between them notches in which pass conductive elements participating in forming the winding of the stator.
- the stator of electrical machines 1, 2, 3, 4, 5, 6 include a number of notches S between 36 and 72 notches, in this case the machines 1 and 3 each have seventy-two notches, machines 2 and 5 have sixty notches, machine 4 has thirty-six notches and machine 6 has forty-eight notches.
- the stators of electrical machines 1, 2, 3, 4, 5, 6 each comprise a winding comprising at least three PH phases.
- Machines 4, 5 and 6 each have three phases, machines 1, 2, 3 have six.
- a conductor W in a slot can be formed by a branch of a pin, says Upin, or a portion of a wire.
- machines 1, 2, 5 and 6 each include a winding formed by Upin pins and machines 3 and 4 include a winding formed by wires.
- the pins are electrically connected by their free ends two by two to form the turns of a phase. This makes it possible to increase the copper content in a notch and/or reduce the difficulty of winding compared to a wired winding to form successive turns.
- the conductors of the pins or the wired conductors connected together form a coil or coils. Each coil can include several turns, in other words electrical path around the axis of rotation, which can be called turns.
- the coils of electric machines 2 and 6 each comprise four copper conductors per slot, electric machines 1 and 5 comprise two copper conductors per slot and machines 3 and 4 respectively comprise 4 and 5 stator turns with 6 or 5 wires in parallel. Either for machine 3, 24 turns per notch and for machine 4, 25 turns per notch.
- the number of conductors per slot is referenced E in table 1.
- phase windings of machines 5 and 6 are designed to form a star coupling C while the phase windings of machines 2, 3 and 4 are designed to form a delta coupling.
- the electrical machines 1, 2, 3, 4, 5, 6 each comprise an inverter/rectifier suitable in motor mode for converting a nominal DC voltage as input into supply voltages of a multi-phase system for each phase. of the stator winding.
- the inverter/rectifier of each electric machine 1, 2, 3, 4 is suitable for transforming a nominal voltage of 48 Volts into an alternating voltage of a multi-phase system, in this case for machines 1, 2 , 3 into six voltages, each for one phase of a three-phase system while the inverter/rectifier of machine 4 transforms the 48 volts into 3 alternating voltages for the eight phases.
- the inverter/rectifier of each electrical machine 5 and 6 is adapted to transform a nominal voltage of 350 volts and 300 volts respectively into a voltage of a multi-phase system, in this case three voltages of a system three-phase for each of the phases.
- the inverter/rectifier can angularly cut each of the phase voltages to adapt the mechanical power according to a command received from a control unit.
- the stator supplied by the inverter/rectifier producing a current from a multi-phase voltage system produces a rotating field in the air gap.
- This magnetic field rotates at the speed of f/P revolutions per second with f supply frequency of the stator windings, and P the number of pairs of poles.
- the rotor composed of p permanent magnets will then align with the rotating field.
- the rotor thus rotates at the same speed as the rotating field.
- the short-circuit current is a function of 1/N or is inversely proportional to the number N of turns.
- the electrical machines 1, 2, 3, 4, 5, 6 each have a winding comprising a number of turns N in the stator per phase which is equal to the number E of conductors in a slot, multiplied by the number P of pairs of poles multiplied by the number A of notches per pole and per phase, all divided by the number B of electrical paths in parallel of the conductors in a notch or/and divided by the square root of three if the winding has a C coupling in a triangle.
- the number N is an integer if the winding is star-connected.
- the number A is equal to the number S divided by the number PH divided by the number P.
- electrical machines having an inverter/rectifier suitable for a nominal input voltage of 48 volts include a number of turns N between 9 and 18.
- electrical machines having an inverter/rectifier suitable for a nominal input voltage between 300 and 350 volts include a number of turns N between 16 and 20.
- the winding of each machine therefore has several turns in series per phase, in order to increase the electromotive force generated.
- the total electromotive force produced is then equal to the sum of the electromotive forces developed in each of the turns of the coil.
- the machines shown in this table are electric machines which have been optimized for starting torque and mechanical power at high speed. As can be seen, for these machines, the number of turns N per phase in the stator per phase is between 9 and 20. Beyond of this ratio either the electrical machine has an insufficient starting torque for a number N of turns per phase less than 9 or a mechanical power at high speed that is too low for a number N of turns per phase greater than 20.
- the air gap is more or less identical for each machine, it follows that the machines whose inverter/rectifier is adapted to a nominal voltage of 48 volts have a performance ratio Ra making it possible to obtain a maximum torque and power for a small footprint and reduced current in the inverter.
- the ratio Ra is equal to the peak torque T multiplied by the peak mechanical power Pui, all divided by a value equal to the peak current Imax multiplied by the number of turns N per phase multiplied by the external diameter D of the machine multiplied by the length L of the machine.
- Machines 1, 2, 3, 4 have a performance ratio greater than 0.02.
- the width of the conductor may be taken in a substantially radial direction, the length then being taken in a substantially ortho-radial direction, or alternatively the length of the conductor may be taken in a direction substantially radial, the width then being taken in a substantially ortho-radial direction.
- the machine 1 may have conductors of rectangular section, each having a dimension De of 5 mm in length and 2 mm in width.
- the machine 1 can have a section Se of conductor in a notch of 20mm 2 (5 * 2 * 2 conductors per notch).
- the machine 2 may have conductors of rectangular section, each having a dimension De of 3.15 mm in length and 2 mm in width.
- Machine 2 may have a section Se of conductor in a notch of 25.2 mm 2 (3.15 * 2 * 4 conductors per notch).
- the machine 3 may have conductors of round section, each having a dimension De of 0.92 mm in diameter. Machine 3 can present a conductor section Se in a slot of 22.08 mm 2 (0.92 * 24 conductors per slot).
- the machine 4 may have conductors of round section, each having a dimension De of 1.28 mm in diameter.
- the machine 4 can have a conductor section Se in a 32 mm 2 notch (1.28 * 25 conductors per notch).
- the machine 5 may have conductors of rectangular section, each having a dimension De of 3.55 mm in length and 2.5 mm in width.
- Machine 5 may have a section Se of conductor in a notch of 17.75 mm 2 (3.55 * 2.5 * 2 conductors per notch).
- the machine 6 may have conductors of rectangular section, each having a dimension De of 5 mm in length and 3.55 mm in width.
- the machine 6 may have a section Se of conductor in a notch of 71 mm 2 (3.55 * 5 * 4 conductors per notch).
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Windings For Motors And Generators (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2104915A FR3122788B1 (fr) | 2021-05-10 | 2021-05-10 | Bobinage en fonction d’une typologie d’une machine électrique tournante synchrone à aimant pour dispositif mobile à autopropulsion |
| PCT/EP2022/062309 WO2022238256A1 (fr) | 2021-05-10 | 2022-05-06 | Bobinage en fonction d'une typologie d'une machine électrique tournante synchrone à aimant pour dispositif mobile à autopropulsion |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4338260A1 true EP4338260A1 (fr) | 2024-03-20 |
Family
ID=76807777
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP22727921.3A Pending EP4338260A1 (fr) | 2021-05-10 | 2022-05-06 | Bobinage en fonction d'une typologie d'une machine électrique tournante synchrone à aimant pour dispositif mobile à autopropulsion |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US20240250592A1 (fr) |
| EP (1) | EP4338260A1 (fr) |
| CN (1) | CN117413450A (fr) |
| BR (1) | BR112023022723A2 (fr) |
| DE (1) | DE202022003067U1 (fr) |
| FR (1) | FR3122788B1 (fr) |
| WO (1) | WO2022238256A1 (fr) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102014223202A1 (de) * | 2014-11-13 | 2016-05-19 | Volkswagen Aktiengesellschaft | Wellenwicklung, Stator und elektrische Maschine |
| CN105186817A (zh) * | 2015-08-18 | 2015-12-23 | 重庆大学 | 一种针对于永磁同步电机绕组切换装置的绕组设计 |
| CA3000362C (fr) * | 2017-04-11 | 2025-09-02 | Bendix Commercial Vehicle Systems Llc | Gestion thermique de vehicule commercial hybride a l'aide d'un generateur de chaleur dynamique |
| US10622875B2 (en) * | 2017-06-07 | 2020-04-14 | GM Global Technology Operations LLC | Interior permanent magnet electric machine |
| US10707713B2 (en) * | 2018-01-15 | 2020-07-07 | Ford Global Technologies, Llc | Balanced hairpin winding electric machine |
| US10998788B2 (en) * | 2019-01-25 | 2021-05-04 | Borgwarner, Inc. | Electric machine with distributed winding having double cross end loops |
| CN112332565A (zh) * | 2020-11-10 | 2021-02-05 | 天津市松正电动汽车技术股份有限公司 | 一种电机定子及电机 |
-
2021
- 2021-05-10 FR FR2104915A patent/FR3122788B1/fr active Active
-
2022
- 2022-05-06 WO PCT/EP2022/062309 patent/WO2022238256A1/fr not_active Ceased
- 2022-05-06 EP EP22727921.3A patent/EP4338260A1/fr active Pending
- 2022-05-06 BR BR112023022723A patent/BR112023022723A2/pt unknown
- 2022-05-06 CN CN202280039403.XA patent/CN117413450A/zh active Pending
- 2022-05-06 US US18/559,414 patent/US20240250592A1/en active Pending
- 2022-05-06 DE DE202022003067.3U patent/DE202022003067U1/de active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN117413450A (zh) | 2024-01-16 |
| DE202022003067U1 (de) | 2024-08-21 |
| US20240250592A1 (en) | 2024-07-25 |
| FR3122788B1 (fr) | 2024-08-16 |
| WO2022238256A1 (fr) | 2022-11-17 |
| FR3122788A1 (fr) | 2022-11-11 |
| BR112023022723A2 (pt) | 2024-01-02 |
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Legal Events
| Date | Code | Title | Description |
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