Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K41/00—Propulsion systems in which a rigid body is moved along a path due to dynamo-electric interaction between the body and a magnetic field travelling along the path
  • H02K41/02—Linear motors; Sectional motors
  • H02K41/025—Asynchronous motors
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K3/00—Details of windings
  • H02K3/02—Windings characterised by the conductor material

Definitions

• ABSTRACT Induction-type reaction rail which can be easily shaped and welded and has a high electrical resistance, for use in conjunction with linear motors which power high speed trains, being made out of an alloy with the composition 0.7-3.5 Mn rest aluminium which has a purity of at least 99.5 in particular with an maximum impurity content of 0.1 Fe and 0.15 Si.
• the alloy is rapidly cooled from the melt by continuous casting then heated to a temperature of 300-500C prior to extrusion and then extruded to shape and the emerging section rapidly cooled.
• the invention concerns reaction rails of the aluminium-manganese type of alloys which because of their low electrical conductivity are used in conjunction with linear motor propulsion for high speed trains, and concerns also a process for the production of these rails.
• transition metals if added in such small quantities that they are in solid solution in the aluminium, lower the conductivity of the aluminium.
• manganese it has been a disadvantage that, because of various precipitation events, the conductivity can not be predicted with certainty.
• These alloys have been used for example for armatures or housings for motors and measurement discs for measuring electrical power consumption.
• the object of the invention is to produce inductiontype reaction rails with a specific electrical resistivity of more than 5 p0 cm out of medium strength aluminiummanganese alloys which can be easily shaped and easily welded.
• the reaction rail is made from an alloy with the composition 0.7-3.5 Mn, the rest being aluminium which has a purity of at least 99.5 and in particular with maximum impurities of 0.l Fe and 0.15 Si and that the alloy is quickly cooled from the melt by means of continuous casting, heated to a hot-forming temperature of 300-500C then shaped by extrusion and the emerging extruded section rapidly cooled. lf increased strength is required then Mg either by itself or together with Si may be added to the composition.
• AlMn alloys could be used as an alloy of high electrical resistance with reproducible properties only by the addition of a further transition metal, is disproved.
• the strength can be increased without a noticeable influence on the electrical conductivity.
• reaction rails In addition to the actual conductor rails, inductiontype reaction rails are also required in the construction of the high speed transportation systems which are presently undergoing extensive development and which are powered by means of linear motors.
• the material for the reaction rails should, moreover, be easy to shape, easy to weld and should have a good corrosion resistance.
• the medium strength range of aluminium alloys is adequate i.e. a tensile strength of about lO-25 kp/mm is usually sufficient for reaction rails.
• manganese has the largest solid solubility in aluminium at elevated temperatures and in the binary AlMn system it precipitates very slowly. Quenched from the melt, as for example in continuous casting, manganese can be strongly supersaturated in solid solution. lf one or more of the alloying components contains impurities of Fe and/or Si then these elements accelerate the precipitation of the Mn atoms. The formation of a manganese-rich second phase can occur not only during solidification but also in the solidified state.
• the electrical resistance is reduced i.e. the conductivity is increased.
• reaction rails are given their desired geometrical shape by extrusion at an elevated temperature.
• a too extreme heating of the cast billet is to be avoided, in no case may the temperature of 500C be exceeded, otherwise considerable quantities of undersired precipitates form very quickly.
• the metal should not exceed the following times and temperatures.
• the temperature of the emerging section is considerably higher then the billet temperature the section must be cooled quickly on leaving the extrusion press.
• the emerging section can be water-quenched immediately, which is particularly advantageous in the case of large cross-sections or higher temperatures.
• the resistance values were obtained by measuring before welding, after welding and across the weld seam. in this way it was found that the average values of these measurements always lay in the same range; in particular the weld seam had then the same electrical resistance as the rest of the metal before welding, namely 77.5 p! cm.
• reaction rail which can be easily shaped and welded and has a high electrical resistance, for use in conjuction with linear motors which power high speed trains, characterised in that the reaction rail is made out of an alloy with the composition 0.7-3.5 Mn, the rest being aluminium which has a purity of at least 99.5 in particular with a maximum impurity content of 0.1 Fe and 0.15 Si.
• Induction-type reaction rail in accordance with claim 1 characterised in that the alloy contains 0.7-2.5 Mn.
• Induction-type reaction rail which can be easily shaped and welded and has a high electrical resistance, for use in conjunction with linear motors which power high speed trains, characterised in that the reaction rail is made out of an alloy with the composition 0.73.5% Mn; 0.1-2% Mg; the rest being aluminum which has a purity of at least 99.5% in particular with a maximum impurity content of 0.1% Fe and 0.15% Si.
• Induction-type reaction rail which can be easily shaped and welded and has a high electrical resistance, for use in conjunction with linear motors which power high speed trains, characterised in that the reaction rail is made out of an alloy with the composition 0.7-3.5% Mn; 0.1-2% Mg, as much silicon as can be bound up with the magnesium as magnesium silicide; the rest being aluminum which has a purity of at least 99.5% in particular with a maximum impurity content of 0.l% Fe and 0.15% Si.
• Process in accordance with claim 5 characterised in that the cast billet, on heating for extrusion, is annealed at a maximum temperature of 500C for a maxition rails in accordance with claim 4, characterised in that the alloy is rapidly cooled from the melt by continuous casting then heated to a temperature of 300500C prior to extrusion and then extruded to shape and the emerging section rapidly cooled and artificially aged.

Landscapes

• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Physics & Mathematics (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Electromagnetism (AREA)
• Extrusion Of Metal (AREA)
• Conductive Materials (AREA)
• Heat Treatment Of Nonferrous Metals Or Alloys (AREA)
• Railway Tracks (AREA)
• Continuous Casting (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=4231122

Family Applications (1)

Country Status (8)

Cited By (3)

Families Citing this family (5)

Citations (7)

Family Cites Families (2)

• 1973
  • 1973-02-16 CH CH232373A patent/CH572268A5/xx not_active IP Right Cessation
• 1974
  • 1974-02-11 IT IT20425/74A patent/IT1006343B/it active
  • 1974-02-11 DE DE2406446A patent/DE2406446C2/de not_active Expired
  • 1974-02-12 US US441761A patent/US3891433A/en not_active Expired - Lifetime
  • 1974-02-14 GB GB679374A patent/GB1439563A/en not_active Expired
  • 1974-02-15 JP JP1772374A patent/JPS5732102B2/ja not_active Expired
  • 1974-02-15 CA CA192,624A patent/CA1008276A/en not_active Expired
  • 1974-02-15 FR FR7405235A patent/FR2218221B1/fr not_active Expired

Patent Citations (7)

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