DE1763585A1 - Induction motor - Google Patents

Description

The invention relates to an incidence with an elongated primary part, which has a ferror Core as well as a Kehrphasenwicklun ^ sordnung from one Has a large number of interconnected coils that are arranged around the pole teeth of the core and are so distributed in the longitudinal direction of the primary part that they geneiiisa ..; oei Inergation from a Hehrphasenstroraciuelle a in Liin.'sriohtuns v / generate changing magnetic field, as well as with an elongated conductive secondary part, which runs in the longitudinal direction of the primary part moveable is arranged *

Induction biomotors of this type are available in various versions Embodiments for different purposes got and can

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as a conventional short-circuit motor or as a so-called tow motor (this is an induction motor with eLrx-m pot or cup-shaped cores made of conductive, non-magnetic material) denotes v / ground, which is cut along an axial plane and rolled up to achieve an irrelevant flat structure has been, scJa; i a rectilinear or curvilinear motion of the "rotor" or "runner" can be generated.

In a known engine of this type ('J.S. Patent No. 2 335 3 ° o) j the stator or primary part has a wound ferromagnetic ^ grain and a ferromagnetic plate, the rr.it delimits an air gap in the core, in which the conductive and non-magnetic "rotor" or secondary part is movable. When operating the magnetic flux generated by the windings of the primary part crosses the secondary part and causes it to move compared to the primary part. The ferromagnetic plate serves to for the magnetic? lu3 to give a low reluctance return path. Another known engine (U.S. Patent No. 1,929,99o) has two identical primary parts, each of which is a ferromagnetic Having a core with an Ieiirpiiaaenwiclclungsanordnung, which delimit an air gap between them for the secondary part, v.'obci the core Jeiies prairie part the way back for the through the other primary part generated magnetic Flu3 form. Of course, the two prairie parts give a larger combined one magnetomotive force and, accordingly, a greater force on the secondary part as a single part in conjunction with

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SAD ORIGINAL

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a linear flow reversal plate.

These known induction motors both have the disadvantage that each coil of a winding overlaps one or more (depending on the number of phases) coils of the other winding or winding. This means for the case when the transverse grooves delimiting the wood teeth are to be completely or substantially completely filled by the coils (it is desirable with regard to the drive force that can be achieved on the secondary part) that the length of the primary part or the primary parts The stretching and turning bobbin loops, that is, the aajnen sections of the bobbins, are necessarily quite long and accordingly the resistance of the windings is great. This in turn means that the permissible ampere-turns and accordingly the achievable magnetomotive force is small. In addition, the overlapping of the coils makes effective cooling of the windings difficult. In view of the low ampere turns and the difficulty of cooling the windings, the known motors cannot generate such great forces and with such high inter- | mid-operating power can be operated as desired . "... ■ '■

The main object of the invention is to create an induction motor of the type described above, which is opposite the known motors is improved in particular with regard to the force acting on the secondary part and the intermittent operating performance. Accordingly, according to the invention

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the primary part for each phase of the winding arrangement has a separate part with the one phase of the winding arrangement belonging coils, the parts of the primary part essentially are identical and face each other with their pole teeth, so that they have an air gap between them for the Limiting the secondary part and being the pole teeth of a rope of the Primary part are offset in the longitudinal direction with respect to the pole tooth of the other part or the other parts of the Priraärteils.

Since the primary part is subdivided into a number of parts corresponding to the number of phases, the winding coils each need not enclose more than one pole tooth, in contrast to two or more in known motors, in which each part of the primary part comprises two or more windings. The longitudinal limbs of the winding coils can therefore follow the shortest possible path between one coil transverse limb and the other, even if the slots receiving the coil transverse limbs are completely or essentially completely W filled by these coil limbs. This leads to a reduced consumption of winding material and to a reduced winding resistance and, accordingly, to a reduced generation of heat. Since adjacent coils do not overlap and the longitudinal legs of the coil can therefore be designed essentially in a straight line, a better heat transfer between the winding coils and the cooling elements is obtained. The reduced heat generation and the improved cooling angle allow an enlargement

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tion de * · ampere turns. Finally, attaching the Simplified windings on the core.

The division of the primary part brings the possibility a simple control of the driving force on the secondary part with itself / in particular through longitudinal displacement of the parts of the Primary part with each other. The invention is illustrated below with reference to schematic drawings of two exemplary embodiments explained in more detail. Show it "

1 shows a two-phase induction motor designed according to the invention in rare view and partially

cut;

Fig. 2 is a sectional view to the left of the line II - II in Fig. 1 and

Fig. 3 is a schematic end view of one according to the invention finding trained three-phase induction motor.

The induction motor shown in Figs. 1 and 2 has a coiled elongated drive or primary part, generally designated 1, and an elongated driven one or abutment .2. The primary part is associated with a Longitudinally extending air gap 3 provided in deader Secondary part slidably held for straight longitudinal movement is, with the help of plain bearings 4 with longitudinal beads

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of the secondary part, which consists of a thin strip of non-magnetic but conductive material, e.g. copper or aluminum. Die'wulste 5 serve not only to guide the secondary part but also to increase its buckling resistance and to create _{a low-resistance or short-circuit path for the currents K induced in the flat central section of the secondary part during operation.} For better clarity, the air gap 5 is greatly enlarged in the drawing; in practice, however, the air gap should essentially not be thicker than the flat central section of the secondary part 2. Normally, the primary part 1 is stationary and the secondary part 2 is movable; however, it is also possible for the primary part to be movable while the secondary part is stationary.

Since the one in the Pig. 1 and 2 is a two-phase motor, the primary part 1 has two windings 6 A and 6 B, one for each phase; the words are connected to a common single-phase alternating current source 7, the connection via a changeover switch or changeover bracket 8 and a conventional phase gap arrangement takes place, which has a capacitance 9 which has the necessary phase shift supplies between the voltages of the two windings. Thus, the single-phase source 7 and form the phase gap arrangement a two-phase power source. Each winding has a plurality of coils IoA or Io B, which are connected to one another and are arranged distributed in the longitudinal direction of the primary part 1.

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So when energizing with alternating current through the phase gap arrangement a wandering one. Magnetic field is generated, the "" windings 6 A and 6 B according to FIG. l mutually offset in the longitudinal direction. The opposite direction of the magnetic field can go through the changeover switch 8 -be reversed ...

According to the invention, the primary part 1 of the two-phase induction motor just as shown in FIGS. 1 and 2 has two parallel and completely identical parts 11 A and 11 B, which each have the associated one of the two windings 6 A and 6 B, respectively. Each part 11 A and 11 B of the primary part .1 has a lamellar ferrc - magnetic core 12 λ, 12 3 with transverse slots that limit the pole teeth I ^ A, IjJ B between them. Each pole tooth I3A, I35 B is surrounded by a coil Io A, Io B of the two windings 6 Λ, 6 B. Each core 12 A, 12 B with its winding coils Io A, Io B is enclosed in a housing 14 A, 14 B made of a material with good thermal conductivity, for example aluminum. The space between the housing, the core and the coils is filled with an insulating compound. According to FIG As can be seen from Fig. 2, the housing 14 A, 14 B of each part 11 A, 11 B of the primary part 1 is provided with a longitudinally extending rib 15 A, 15 B which is separated from one another The ribs and grooves serve to secure the mutual lateral position of the parts 11 A, 11 B of the primary part.

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Since each part 11 A, 11 B of the primary part only carries one of the two windings β A, 6 B and accordingly the Winding coils Io A, Io B each do not have more than one pole tooth 15 A, 13 B must enclose, there is no overlap between adjacent winding coils, so that the coil legs extending in the longitudinal direction of the primary part - v / oak coil legs do not contribute anything to the flow of force causing the movement of the secondary part - one fe can have minimal length. This is in terms of the whole Winding resistance and, accordingly, on the generation of heat and the achievable ampere turns are an advantage. For the same reason, they can extend in the longitudinal direction Coil legs are essentially rectilinear and grounded, which means that there is good heat transfer from the windings to the heat dissipating housings I ^ A, 14 B can be obtained. These advantages make it possible to use the driving force generated by the engine compared to that of known motors of comparable size and the motor with higher intermittent

to operate the operating power than is possible with the known engines. Another advantage of the non-overlapping coils is that the application of the windings to the primary part is simplified so that the windings can be applied by a simple automatic winding machine. . "."

The invention also offers the possibility of dw control of the drive force, since the parts 11 A, 11 B of the primary part or.

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in other places the windings 6 A, β B- in the longitudinal direction shifted against each other; be able to ground. The greatest driving force is obtained when, as shown in Fig. 1, the pole teeth and winding

lungsspulen, a part of the primary part relative to the pole teeth and winding coils of the other part of the Priraärteils are offset by a 'distance that corresponds to half the pole tooth pitch or coil pitch. The mutual offset of the two parts of modified 'Wird- of the primary part of this value, starting progressively, so the driving force is reduced accordingly ä to zero when the Polsahne Wicklungsspuleη and aligned with those of one part of the other part. As can be seen from the PIg * Ί, the part 11 B of the primary part is fastened to a stationary base plate 16 with the aid of screws 17. The other part 11 A of the primary part is adjustable in the longitudinal direction with respect to part 1.1 B with the aid of a threaded spindle 17 'with head 18. _r The threaded spindle 17 provided by ein.mit corresponding threaded hole of a lug 19 is screwed through it, which is fixed to the casing I ^ A, and is rotatable but

axially immovable received by openings in lugs 2o, which at are attached to a stationary structural part.

The invention can of course also be implemented on a three-phase motor. A Ausftlhrungsform is shown in Fig. 3, "The parts 21 of the primary part, the FAI in this le ^T are three in number and the corresponding one of the three windings 22 carry the three-phase winding arrangement, sitting in a frame

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2j5 and are offset from one another by 120, while in contrast to this, in the case of the embodiment according to FIGS. 1 and 2, the angular offset amounts to 180. The secondary part 2k has three flat strips of conductive, but non-magnetic material, which consist of one. 5 ”and are each offset by 120 at an angle to one another. The secondary part could also be made from a ferromagnetic ™. Rod having circular or triangular cross-section around cost, which is enclosed by a correspondingly shaped sleeve made of a conductive, non-magnetic material cdoch _v. The ferromagnetic rod provides a low reluctance path for magnetic flux between the parts of the primary.

The invention has been applied above in a Induction motor for generating rectilinear movement of the secondary part explained; of course, however, is that The invention can also be used with induction motors for generating curved movement of the secondary part and with so-called axial air gap motors, in which the secondary part is a rotatably mounted annular disc.

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Claims (2)

Pa te η t a ns nr'ίο he ■ 1. Induction motor, ir. With an elongated primary part, the «inner ferromagnetic :! Core with one of a plurality reversed phase winding arrangement formed by interconnected coils arranged around pole teeth of the core which the coils are distributed in the longitudinal direction of the primary part and together when energized by a reversing phase sens current source . generate a longitudinally moving magnetic field, as well as with an elongated conductive secondary part extending in the longitudinal direction of the primary part "is movably arranged, characterized in that the" primary part (1) for each phase of the winding arrangement a separate part (Ii A, 11 3) with the to a phase of the winding arrangement (6A 6 B) belonging coils and the parts (1.1 A, 11 B) of the primary part essentially are identical and with their pole teeth (Ij5 A, Ij B) below Leaving an air gap (5) for the secondary part (2) each other are opposite, with the pole teeth of one part of the primary . · ■ "■■ ■■; ·. · ... ■■■, ■ - are partly offset in the longitudinal direction with respect to the pole teeth of the other part or the other parts. _ 2. Induction motor according to claim 1, characterized in that that the parts (IiA, 11 B) of the primary part in the longitudinal direction · against each other are movable. 0 0 9 8'b 9/0865 BAD Blank page