WO2021052947A1 - Système d'alimentation électrique de véhicules routiers - Google Patents

Système d'alimentation électrique de véhicules routiers Download PDF

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Publication number
WO2021052947A1
WO2021052947A1 PCT/EP2020/075741 EP2020075741W WO2021052947A1 WO 2021052947 A1 WO2021052947 A1 WO 2021052947A1 EP 2020075741 W EP2020075741 W EP 2020075741W WO 2021052947 A1 WO2021052947 A1 WO 2021052947A1
Authority
WO
WIPO (PCT)
Prior art keywords
contact
electric conductor
hardness
contact portion
electric
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.)
Ceased
Application number
PCT/EP2020/075741
Other languages
English (en)
Inventor
Gunnar Asplund
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.)
Elways AB
Original Assignee
Elways AB
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 Elways AB filed Critical Elways AB
Priority to EP20772277.8A priority Critical patent/EP4031399A1/fr
Publication of WO2021052947A1 publication Critical patent/WO2021052947A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L5/00—Current collectors for power supply lines of electrically-propelled vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L5/00—Current collectors for power supply lines of electrically-propelled vehicles
    • B60L5/38—Current collectors for power supply lines of electrically-propelled vehicles for collecting current from conductor rails
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L5/00—Current collectors for power supply lines of electrically-propelled vehicles
    • B60L5/40—Current collectors for power supply lines of electrically-propelled vehicles for collecting current from lines in slotted conduits
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
    • B60L50/53—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells in combination with an external power supply, e.g. from overhead contact lines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
    • B60M1/00—Power supply lines for contact with collector on vehicle
    • B60M1/30—Power rails
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L5/00—Current collectors for power supply lines of electrically-propelled vehicles
    • B60L5/04—Current collectors for power supply lines of electrically-propelled vehicles using rollers or sliding shoes in contact with trolley wire
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

Definitions

  • the invention relates to a system for electrical feeding of electrically propellable road vehicles using a rail element with electric conductors located in a road section on which the vehicle travels.
  • WO 2011/123049 proposes complementing the battery of the electric vehicle with electric feeding of the vehicle while driving.
  • a system is disclosed for electric propulsion of a vehicle along a road comprising rail elements/structures having grooves provided with electric conductors therein that may be put under voltage and located in longitudinal tracks or channels in the road.
  • the vehicle is equipped with a current collector which during contact with the electric conductors allows for transfer of electric power between the electric conductors and the vehicle to propel the vehicle and charge its battery or set of batteries.
  • the stretch of road carrying the rail elements is divided into electrically separated road sections oriented in series, whereby the rail elements are only put under voltage when a vehicle with its current collector passes the relevant road section.
  • An object of the invention is to provide a system for electrical feeding of road vehicles having improved durability.
  • a system for electrical feeding of electrically propellable road vehicles comprises a rail element having at least one electric conductor extending in a lengthwise direction thereof and a current collector adapted to co-act with the rail element.
  • Each of the at least one electric conductor is arranged in at least one groove in the rail element, for instance in a respective groove, and is adapted to be put under voltage for supplying electric power to the vehicle.
  • the rail element is adapted to be located in a road section on which the vehicle is travelling, wherein the current collector is connectable to the vehicle and is displaceable vertically and laterally and comprises at least one contact element.
  • Each contact element is adapted to connect mechanically and electrically with a corresponding contact portion of the at least one electric conductor.
  • the contact element and at least the contact portions of the electric conductors have a hardness being higher than that of quartz.
  • a system where the contact element, or at least portion(s) thereof is adapted to connect with contact portion(s) of the electric conductor(s), and the contact portion(s) of the electric conductors(s) (or the electric conductors as a whole) have a hardness being higher than that of quartz. Put differently, the hardness is more than 7 on the Mohs hardness scale, or equivalent hardness on another hardness scale.
  • the above-mentioned contact portion of the electric conductor may refer to a surface portion of the electric conductor, or to a coating on the electric conductor, or to a thicker wear layer on the electric conductor.
  • the contact portion is a portion of the electric conductor which extends in its longitudinal direction, i.e. a portion which the contact element makes contact with while the vehicle is driving along the road section.
  • the invention is based on the insight that a major cause of wear on the contact elements of the current collector and the contact portions of the electric conductors is sand, mostly consisting of quartz, which sticks to the inner surfaces of the groove(s) of the rail element when these surfaces are wet.
  • sand mostly consisting of quartz
  • the inventor has realized that such a mixture of sand and water adhering to the inner surfaces is difficult to remove using known cleansing devices in the grooves, and further that the contact element and the contact portions of the electric conductors therefore need to have a greater hardness than quartz.
  • the at least one contact element and the corresponding contact portion of the at least one electric conductor has the same hardness or is made from the same material.
  • the at least one contact element may have a greater hardness than the corresponding contact portion of the at least one electric conductor.
  • the contact elements of the current collector being in sliding contact with the contact portions of the rail element, should have a lower hardness than the rail element, such that the (easy to replace) contact elements are worn down rather than the rail element.
  • the contact element(s), or at least contact portions thereof being adapted to connect with contact portion(s) of the electric conductor(s), may advantageously be provided with rounded edges, for instance having a radius in the range of 1-5 mm, to avoid damaging the contact portion(s). This is particularly advantageous in embodiments where the contact element(s) have a greater hardness than the contact portion(s).
  • the at least one contact element, or at least contact portion(s) thereof is adapted to connect with contact portion(s) of the electric conductor(s), has a hardness of more than 7.5 on the Mohs hardness scale (or equivalent hardness on another hardness scale), for instance by being made from hardened stainless steel.
  • the at least one contact element may have an even higher hardness and consist of, or comprise, a material having a hardness higher than that of hardened stainless steel or having a hardness of more than 8 on the Mohs hardness scale (or equivalent hardness on another hardness scale), for example a material being or comprising tungsten carbide, silicon carbide, chromium carbide or boron nitride.
  • the contact element comprises particles of a hard material (for example tungsten carbide) embedded in a softer material (such as chromium).
  • the contact portions of the at least one electric conductor has a hardness of more than 7.5 on the Mohs hardness scale (or equivalent hardness on another hardness scale), for instance by being made from hardened stainless steel.
  • the contact portion comprises or consists of a coating of a material having a higher hardness than hardened stainless steel, or having a hardness of more than 8 or more than 9 on the Mohs hardness scale, or equivalent hardness.
  • the material may comprise tungsten carbide, silicon carbide, chromium carbide or boron nitride or particles thereof embedded in a softer material.
  • the current collector comprises at least one rotatable wheel, each comprising (or constituting) one of the at least one contact element, each rotatable wheel being configured to roll against the corresponding contact portion of the at least one electric conductor to make contact therewith.
  • a rotatable wheel wear is further reduced (compared to using a sliding contact) and/or a less expensive (less hard) material may be used to manufacture the contact element.
  • the wheel may be configured to rotate passively, i.e. by means of friction against the corresponding contact portion of the at least one electric conductor.
  • the current collector may comprise at least one electric motor configured to rotate the at least one rotatable wheel.
  • the rotatable wheel may furthermore be mechanically and electrically attached to a rotational axle, wherein a sliding contact element is arranged in sliding contact with the axle at an opposite end to the wheel, which sliding contact is configured to connect the wheel electrically to the vehicle.
  • the at least one electric conductor, or at least contact portion(s) thereof is disposed on a respective vertical side wall portion of groove(s) in the rail element, and the current collector is configured to press the at least one contact element against a corresponding contact portion of the electric conductor(s). This further reduces wear compared to having the electric conductor(s) at a bottom of a corresponding groove.
  • fig. 1 shows a schematic cross section view of an embodiment of a system according to the invention
  • fig. 2a shows a schematic cross section view of parts of another embodiment of a system according to the invention
  • fig. 2b shows a top view of the embodiment in fig. 2a
  • fig. 3 shows parts of another embodiment of a system according to the invention.
  • Fig. 1 shows a schematic cross section view of an embodiment of a system 1 according to the invention.
  • the figure shows an electrically propellable vehicle 2 which however is not part of the system according to the invention.
  • the system comprises a current collector 3 and a rail element 4 comprising two electric conductors 4a, 4b, each arranged in a corresponding groove 4’, 4” in the rail element.
  • the rail element is greatly exaggerated in size for clarity reasons.
  • the electric conductors are put under voltage for supplying electric power to the vehicle. From the cross section shown in fig. 1 , it is understood that the conductors 4a-b extend in the longitudinal direction of the rail element.
  • the current collector 3 is connectable to the vehicle 2 and is provided with contact elements 3a, 3b each arranged at a lower end of a corresponding collector arm extending into the grooves 4’, 4”.
  • the contact elements 3a, 3b are configured to be brought in electrical and mechanical contact with a corresponding conductor 4a, 4b.
  • the contact elements 3a, 3b make sliding contact with a vertical wall portion of the corresponding conductor 4a, 4b, which in this embodiment are provided as U-shaped beams or profiles at the bottom of the grooves 4’, 4”.
  • the conductors 4a, 4b may be plate- or rod-shaped or the like and be disposed on or in vertical side wall portions of the grooves 4’, 4”, while the contact elements make contact in the same manner as shown in fig. 1.
  • the contact elements 3a, 3b and the electric conductors 4a, 4b all have a hardness being higher than that of quartz (i.e. more than 7 on the Mohs hardness scale).
  • the contact elements 3a, 3b are made from a material comprising tungsten carbide (which has a hardness of about 9 on the Mohs scale), while the electric conductors are made from hardened stainless steel (i.e. having a hardness of about 7.5-8 on the Mohs scale). The contact elements thus have greater hardness than the electric conductors.
  • Fig. 1 further shows that the rail element 4 is provided with electrically conducting ground conductors 4c, 4d connected to ground potential.
  • the ground conductors are provided as a single U-shaped unit made from electrically conducting metal arranged at a top centre portion of the rail element between the grooves 4’, 4” with its shanks extending downwards into the respective groove.
  • ground contact elements 3d are configured to be brought in electrical and mechanical contact with a corresponding ground conductor 4c, 4d.
  • the at least one ground contact element is electrically connected to a chassis and/or body portion 2’ of the vehicle.
  • the ground contact elements make contact with vertical wall portions of the ground conductors 4c, 4d.
  • the ground contact elements 4a, 4b are made from a softer material than the contact elements 3a, 3b, for example graphite , and the ground conductors are also made from a softer material than the electric conductors, for example copper
  • the use of softer materials is possible since the ground contact elements in this embodiment are only brought in contact with the ground conductors at low speeds, such as below 20 km/h, thereby causing much less wear.
  • the ground contact elements and the ground conductors are made from corresponding materials as the contact elements and the electric conductors.
  • the system is advantageously furthermore provided with one or more cleansing means comprising a front portion inclined at an acute angle with respect to the bottom part of the cleansing device to clean the groove(s) from particles and loose objects.
  • cleansing means is described in further detail in applicants’ patent EP2994337B1.
  • Fig. 2a shows a schematic cross section view of parts of another embodiment of a system according to the invention
  • fig. 2b shows a top view of the embodiment in fig. 2a
  • the current collector 13 comprises contact elements 13a, 13b in the form of rotatable wheels being rotatable around a substantially vertical axis of rotation coinciding with collector arms or shafts 16a, 16b.
  • the rail element 14 is provided with grooves 14’, 14” in which electric conductors 14a, 14b are arranged.
  • the contact portions of the electric conductors are provided in the form of a wear layers 14a’, 14b’, which may also be referred to as coating, provided at opposite vertical wall portions of the electric conductors 14a, 14b.
  • the wheels 13a, 13b rotate passively, i.e. by means of friction between the wheels and the conductors caused by relative longitudinal movement between the vehicle and the conductors.
  • the system may comprise one or motors which rotates the wheels to have the same peripheral speed as the vehicle speed.
  • the peripheral surface of wheels 13a, 13b are made from a material or steel comprising tungsten carbide particles, while the contact portions 14a’, 14b’ of the electric conductors are made from hardened stainless steel (i.e. having a hardness of about 7.5-8 on the Mohs scale).
  • the contact portions may also comprise harder materials such as tungsten or chromium carbides to further improve durability.
  • fig. 2 only shows contact elements, it is understood that this embodiment may also comprise ground contact elements corresponding to the ground contact elements 3c, 3d in fig. 1, although being contact elements of the same type as wheels 13a, 13b.
  • Fig. 3 shows parts of another embodiment of a system according to the invention.
  • the embodiment corresponds to the embodiment in fig. 2, with the difference being in the mechanical design of the current collector, where fig. 3 illustrates a contact element in the form of a rotatable wheel 23a (corresponding to wheel 13a in fig. 2).
  • the wheel is attached mechanically and electrically at a lower end of a rotational axle 26a arranged rotatably inside a tube 27a adapted to be fixedly attached to the vehicle.
  • a radially directed sliding contact element 28a is arranged in sliding contact with an upper end of the axle 26a.
  • the sliding contact element 28a is electrically connectable to the vehicle to connect the wheel 23a electrically to the vehicle.
  • the materials of wheel 23a and its corresponding electric conductor correspond to those in fig. 2.
  • the rail element may comprise one or more further electric conductor(s), for instance three conductors to provide a three-phase alternating current feed.
  • the electric conductor(s) and ground conductor(s) may have a different cross section than shown in figs. 1-2.
  • different combinations of materials of the contact elements and conductors are foreseeable within the scope of the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Current-Collector Devices For Electrically Propelled Vehicles (AREA)

Abstract

L'invention concerne un système d'alimentation électrique de véhicules routiers à propulsion électrique. Le système comprend un élément rail comportant au moins un conducteur électrique s'étendant dans une direction longitudinale de celui-ci et un collecteur de courant conçu pour coopérer avec l'élément rail. Le ou les conducteurs électriques sont agencés dans au moins une rainure dans l'élément rail et sont conçus pour être mis sous tension. L'élément rail est conçu pour être situé dans une section de route sur laquelle le véhicule se déplace, le collecteur de courant pouvant être connecté au véhicule et pouvant être déplacé verticalement et latéralement et comprenant au moins un élément de contact. Chaque élément de contact est conçu pour être relié mécaniquement et électriquement à une partie de contact correspondante du ou des conducteurs électriques. L'élément de contact et au moins les parties de contact des conducteurs électriques ont une dureté supérieure à celle du quartz.
PCT/EP2020/075741 2019-09-16 2020-09-15 Système d'alimentation électrique de véhicules routiers Ceased WO2021052947A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20772277.8A EP4031399A1 (fr) 2019-09-16 2020-09-15 Système d'alimentation électrique de véhicules routiers

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE1951045A SE543630C2 (en) 2019-09-16 2019-09-16 System for electrical feeding of road vehicles
SE1951045-2 2019-09-16

Publications (1)

Publication Number Publication Date
WO2021052947A1 true WO2021052947A1 (fr) 2021-03-25

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2020/075741 Ceased WO2021052947A1 (fr) 2019-09-16 2020-09-15 Système d'alimentation électrique de véhicules routiers

Country Status (3)

Country Link
EP (1) EP4031399A1 (fr)
SE (1) SE543630C2 (fr)
WO (1) WO2021052947A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0522955A1 (fr) * 1991-07-09 1993-01-13 Delachaux S.A. Dispositif d'alimentation en électricité par contact avec un frotteur et procédé de réalisation d'un tel dispositif
JPH09149503A (ja) * 1995-11-20 1997-06-06 Kyocera Corp 集電用すり部材
WO2011123049A1 (fr) 2010-04-01 2011-10-06 Elways Ab Système conçu pour ou un plusieurs véhicules propulsables électriquement (structure de rail)
WO2016174030A1 (fr) * 2015-04-27 2016-11-03 Elways Ab Système et procédé permettant l'alimentation électrique d'un véhicule
EP2994337B1 (fr) 2013-05-07 2019-07-10 Elways AB Piste et contact insensibles aux intemperies pour une alimentation electrique de vehicules de route
WO2020088806A1 (fr) * 2018-10-31 2020-05-07 Conductix-Wampfler Gmbh Récepteur de courant, ligne de contact et système de ligne de contact

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4310666A1 (de) * 1993-04-01 1994-10-06 Woehr Otto Gmbh Parkanlage für Kraftfahrzeuge

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0522955A1 (fr) * 1991-07-09 1993-01-13 Delachaux S.A. Dispositif d'alimentation en électricité par contact avec un frotteur et procédé de réalisation d'un tel dispositif
JPH09149503A (ja) * 1995-11-20 1997-06-06 Kyocera Corp 集電用すり部材
WO2011123049A1 (fr) 2010-04-01 2011-10-06 Elways Ab Système conçu pour ou un plusieurs véhicules propulsables électriquement (structure de rail)
EP2994337B1 (fr) 2013-05-07 2019-07-10 Elways AB Piste et contact insensibles aux intemperies pour une alimentation electrique de vehicules de route
WO2016174030A1 (fr) * 2015-04-27 2016-11-03 Elways Ab Système et procédé permettant l'alimentation électrique d'un véhicule
WO2020088806A1 (fr) * 2018-10-31 2020-05-07 Conductix-Wampfler Gmbh Récepteur de courant, ligne de contact et système de ligne de contact

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
E WILFRED TAYLOR ET AL: "Correlation of the Mohs's scale of hardness with the Vickers' s hardness numbers", JOURN. INST. METALS NATURE, 1 January 1949 (1949-01-01), pages 323, XP055761960, Retrieved from the Internet <URL:https://rruff.info/doclib/MinMag/Volume_28/28-206-718.pdf> *

Also Published As

Publication number Publication date
EP4031399A1 (fr) 2022-07-27
SE543630C2 (en) 2021-04-27
SE1951045A1 (en) 2021-03-17

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