USRE12700E - Electric traction apparatus - Google Patents

Electric traction apparatus Download PDF

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Publication number
USRE12700E
USRE12700E US RE12700 E USRE12700 E US RE12700E
Authority
US
United States
Prior art keywords
armature
rail
magnet
magnetic
poles
Prior art date
Application number
Other languages
English (en)
Inventor
Alfred Zeiiden
Original Assignee
J
Filing date
Publication date

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  • My invention relates to the fact that instead of at iotary field such as is common in polyphaseapparatus for translating electrical into mechanical energy and vice versa, a traveling field 1'. e., a field moving on a line other than a circular line would result if, as one might imagine, a rotary field motor-were opened out and were made infinitely large, and in accordance therewith any prejudicial one-sided attraction that otherwise might occur between the inducing and the induced parts is obviated or the attraction is turned to account; by an appropriate arrangement of the said parts, which avoids their too close juxtaposition so that actual mechanical contact is avoided and starting is.
  • a traveling field 1' e., a field moving on a line other than a circular line
  • FIG. 1 of the accompanying drawings is a diagram illustrating a simple apparatus in whichis exemplified the fundamental idea underlying the invention.
  • .Fig. 2 illustrates a modification.
  • Fig. 3 is a view taken at right angles to Fig. 2.
  • Fig. 4 shows a further modification.
  • Fig. 5 is an elevation of the induced part shown in Fig. 4.
  • Fig. 6 is a sectional view showing the inducing and induced parts shown in Fig. 4.
  • Figs. 7, 8 and 9 show third, fourth and filth modifications.
  • Fig. .10 is a side elevation of a traveling field magnet, together with its rail-like armature.
  • Fig. 11 is a front or end view of such magnet and armature.
  • Fig. 12 and 13 show a )artially wound rail respectively from the side and top.
  • Fig. 14 shows the rail, the magnet, the magnet-l alanciug device and the rail between them; and
  • Fig. 15 is a diagram of the electrical connections.
  • Fig. lti illustrates the application of the invention to an elevator.
  • a section of the same might comprise a. laminated body of iron with triphase windings thereon and an armature of any desired length located thereunder.
  • Suchja device is illustrated in Fig. 1, in which the laminated magnet body e with the triphas'e winding a, b, c, is located at a certain distance (indicated by lines and arrows at (1) above the armature, which, to form an equivalent to the copper'windings and iron core of a short circuit armature, may comprise a brass strip g and an iron strip f.
  • the triphase windings when excited produce three magnetic effects that combine to produce one resultant field whose maximum and zero values in the magnetic mass alternate at a rate corresponding to the periodicity of the current supplied, so that a traveling field is produced whose rate of progress is the product of the pole length and the periodicity of the current.
  • a traveling field is produced whose rate of progress is the product of the pole length and the periodicity of the current.
  • such a magnet e (having its winding connected in parallel in series, or in groups), be suspended under any vehicle, as for instance a railway carriage, and for use over a continuous fined armature, then such a vehicle possesses in".”contradistinction to other power-operated vehicle the advantage that a certain part of the weight sometimes added to produce adhesion or stability may be dispensed with as there exists between the magnet and the armature a strong force of attraction, which is equal to a stopping or overloading of the vehicle.
  • non-magnetic armaturerail When a non-magnetic armaturerail is used there is adapted to move along one'side thereof a magnet, and along the other side a mass OfJaminatediron which is rigidly connected to the magnet and provides magnetic conduction for the lines of force from the magnet.
  • the non-magnetic rail g (Figs. 2 and 3) is thus located in the middle and between the laminated poles e of the magnet and the laminated iron mass f, both of which, by means of insulating stays h, may be fixed beneath scriptions, as in polyphase current dynamo machines;-
  • the arma-' motor would operate at a proportionate disadvantagefor the whole of the exposed (not wound) portion of the stretch.
  • the windings 11,. as shown in 7 these figures, are located in vertically arranged grooves 10 is shown a traveling'field magnct,'gu ided in this in the armature f, so that when uncovered this appears provided w'ith ribs u.
  • the cross section of the winding wire, and also the method of winding, whether the individual coils are short-circuited or switched'in partly in series, is regulated in any-special case by the necessary electrical resistance.
  • the magnet may according to this invention be suspended in such a way that movement of the magnet at right angles to the direction of the rails can take place; this may be effected, for instance, by rods m carrying the magnet and supported by an axis 0 contained in a guide frame 1) so as to have some play 'for lateral movement (Fig.
  • Themagnet pole e which is laterallyshiftable owing to the hanger m by which it is carried, supports by means of a forked hanger q a roller s, rotating upon its axis r, a short distance removed from the armature f; Upon sidewise swinging of the car, these rollers prevent contact of the rail with the poles, in the same manner as the small wheels I in Fig. 4. For convenience, at the right-hand side of Fig. l]. the roller s,
  • This invention is particularly applicable to the propulsion of railway vehicles on the mono-rail system, because the track can be constructed in such a way that the carrying rail also forms the armature for the travelingfield motor. The cost of an extra armature rail is thus saved.
  • thcrearc usually provided guides to prevent too great lateral motion of the vehicle so that the means hcreinbcfore described for maintaining a sufficient distance between v, the magnet poles and the railway in some cases may be dispensed with.
  • pole and rail 21 strong attractive magnetic power, which operates injuriously, and which-is overcome through the arrangement of two poles, at the same distance, at both sides of the rail.
  • Fig. 14 shows two methods by which this may be accomplished,-eithcr that the rail, on the curve, is not laid exactly between both poles, butis laida short distance nearer the outer pole, or that the outer side of the rail is thickened by a piece 10.
  • the carrying rail f (Fig.
  • the one sided magnetic-stress can also be obviated by using a magnet or magnets having poles facing in' opposite directions towards two armature rails, as shown diagrammatically in Fig. 8 in the case .of alift, so: that each of the two magnets 6 will act in- .ductively upon one of the rails f.
  • the magnets neednot be attached to the lie cage directly but might be attached to'the cables thereof and could in this case conveniently be 'made'oi such a' size that they would serve as counterweights to the cage; or, since movement of the lift depends upon relative movement between the magnets and the armature oi the motor, the armature rail could be fixed .to the lift cage or s'erveas a counterweight or counter-weights thereof and the mag nctsor magnet be stationary.
  • the invention provides for preventionof onesided magnetic attraction by using two opposed mag netic forces but in some instances, as when using magnetic attraction to increase adhesion or stability, the effect is rendered useful rather than prejudicial.
  • Another manner of utilizing such unbalanced magnetism is the reverse of that just referred to and provides that the magnetic effect counteracts instead of assists gravity and hence reduces the effective weight of the load to be carried.
  • This device can be used for instance on railways of the so-called suspension type,
  • the magnets e are current is conducted to the car by means of the conducting-wires y", 31 y"; it is in principle the same,
  • duction may be carried out by a cable Z.
  • a cable Z In the circuit, according to Fig. 15, are arranged a threepole high- .tension' safetyduse A and-a three pole high-tension Within the car the con- I cut-out switch B.
  • the poles are secured to the cable Z by, means of clamps 1)., b b so'that the poles have no movable parts.
  • Their winding in Fig. 15 is 'according to the scheme of Fig. 4, ,as this serves for series winding.
  • the induction starter D may be used, at the same time, in the well-known manner, as a transformer and the pole e correspondingly serve for low tension.

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