DE8104002U1 - ELECTRIC TWO-MOTOR DRIVE, ESPECIALLY TO DRIVE A WASHING MACHINE - Google Patents

Description

SIEMENS AKTIENGESELLSCHAFT Our mark

Berlin and Munich VPA 31 P 3 O H DE

Electric two-motor drive, especially for driving a washing machine

The invention relates to an electric two-motor drive, in particular for driving a washing machine, which is described in the preamble of claim 1 or of the claim 2 specified type. Such a Two-motor drive is known from DE-AS 27 44 472.

The well-known two-motor drive is characterized in, in particular for use in washing machines with high Spin final speeds, advantageously due to its compact design and large speed spread without the need the interposition of a reduction gear. The possibility given in the known case, to be able to largely freely choose favorable utilization ratios to avoid magnetic noises is made possible by A winding design has to be paid for, which leads to difficulties in production and in the anti-lock protection of the winding can lead. Since in the known case both a first uncrossed and a second crossed loop winding to be connected to the same lamellas of the commutator and this integrated rotor winding system both is used for induction motor operation as well as for universal motor operation, there are design repercussions between two-pole universal motor operation and multi-pole induction motor operation. At the same time, there are special constructions of the commutator and in particular the commutator hook as well as manufacturing equipment necessary to each to be able to safely contact two winding wires with just one commutator hook.

Bk 2 Bih / 02/11/1981

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DE-AS 25 30 294 is a two-motor drive with a connected to the slats of a commutator two-pole loop winding on the one hand and one of it galvanically completely separated and thus to the., hook of the commutator connectionless induction motor winding,. known, but the number of sliders provided there is || according to the usual, based on the number of poles, number of phases and | Number of slots per pole and strand according to the formula N2 = 2 p.mp· cu specified number of slots, so that magnetic noise problems in particular with higher-pole motors because of the limited possibility of freely selectable payload ratios are difficult to control.

The object of the present invention is therefore to provide an electric twin-motor drive of the type mentioned at the beginning Art to create, on the one hand, a simple manufacturability, in particular while avoiding by several Winding wires to be covered commutator hook, guaranteed and at the same time by largely free choice of Usage ratio provides a favorable prerequisite for low magnetic noise.

The solution to this problem is with an electric two-motor drive of the type mentioned at the beginning by the characterizing features of FatoRt ^ nspruchs 1 or des Opposition 2 possible. Although the number of sliders can thus be largely freely selected, due to the inventive Winding design the induction motor winding in the rotor as a separate winding without contact run to the commutator and at the same time achieved that when the two-pole stator winding is excited in the Universal motor operation supplement the induced voltages in each coil pair to zero and thus in universal motor operation no asynchronous torques arise, which can be seen as braking torques, especially at oversynchronous speed can have a disruptive effect.

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The two-motor electric drive according to the invention with its galvanic separation of the induction motor winding and the universal motor winding in the rotor at the same time largely free availability via the number of slots , allows an individual design of both windings with regard to good operating behavior especially in Induktiona tor washing operation on the one hand or in universal motor spin operation on the other hand with blocking protection that can be guaranteed in a simple manner at the same time. When choosing the usability ratio are only the known unfavorable number combinations between the number of stator and number of sliders to avoid. In order to guarantee reliable start-up behavior in every case, at least two Coil pairs can be provided with coils connected in series to form two short circuits.

Advantageous embodiments of the invention are characterized by the subjects of subclaims 3 to 17. According to the teaching of claims 4 and 5 or 7 and 8 designed twin-motor versions represent a compromise between minimal winding, in particular copper, on the one hand and adequate operating behavior on the other hand. The best operating behavior is achieved with a two-motor drive in which all grooves are similarly occupied with several coil sides per slot; in the case of a two-motor drive with eight-pole The induction motor winding and eighteen slots in the rotor are expediently two sides of the coil provided per groove.

In the manufacture of a two-motor drive designed according to the invention it can normally be assumed that first each coil group is connected in series with its Coils are wound individually and two free winding ends, namely the beginning of the winding and the

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Winding end "of a series connection; these free winding ends are then to be connected to one another in the correct manner in the sense of the short-circuited series connections according to the invention; the greater the number of coils or coil groups, this connection requires a more complex individual handling can now be simplified in a decisive way that all connection points between each winding start and one winding end of each series circuit are connected by an electrical short-circuiter A switching ring with at least one switching ring hook for receiving the switching ring arranged in front of one of the two winding heads concentrically to the shaft of the rotor is advantageous as a short-circuiter, especially in terms of winding technology The beginnings and ends of the windings to be connected to one another are provided; the entire induction motor rotor winding can now _r even when more than one group of coils, starting from a single winding start to leading up to be wound into a single winding end as a continuous uninterrupted loose winding wire by each guided at the end of a group of coils the winding end to the switching ring and continuously from this as The beginning of the winding is passed on to the next coil group.

To achieve one as simple as possible, in particular mechanically wound rotor with a flyer and a small imbalance of e.g. approx. 13,000 rpm Rotating rotor in the centrifugal operation is provided according to one embodiment of the invention that the switching ring is provided with several, distributed on its circumference arranged switching ring hooks, which in the sense of a flyer winding with uninterruptible winding wire from

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Winding starts and ends of the coil pairs wrapped around are, the number of switching ring hooks expediently at least as large as the number the coil pairs is. Unhindered mechanical winding of the rotor with the one connected to the commutator Universal motor winding on the one hand and the induction motor winding connected to the switching ring on the other hand, is further promoted by the fact that the switching ring is in front of that winding head of the induction motor winding is arranged facing away from the collector connected solely to the universal motor winding is.

The invention and further advantageous refinements are described below with the aid of schematically illustrated exemplary embodiments explained in more detail in the drawing demonstrate:

Fig. 1 shows the principle circuit for a washing machine drive with a three-strand, eight-pole induction motor part and a two-pole universal motor part in the stator, each arranged in the same laminated core, Fig. 2 shows the winding scheme of the twenty-four Grooves of the stator core housed twelve-pole, three-strand induction motor part, 3 shows the winding diagram of the field winding accommodated in the twenty-four slots of the stator core of the universal motor part, FIGS. 4 to 6, three embodiments of the in the eighteen The induction motor rotor winding designed according to the invention and accommodated in the slots of the laminated rotor core, 7 shows the winding diagram of the two-pole universal motor rotor winding accommodated in the eighteen slots of the laminated rotor core ,

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8 shows the one to nine winding and connection scheme Eight-pole connected switching ring hook of a switching ring, accommodated in eighteen grooves of the rotor core Induction motor rotor winding with a total of nine pairs of coils, each with a series connection of two Wash,

9, 10 each show a longitudinal section through two different versions of the front end winding of the Rotor, encapsulated in a divisible cassette,

11 shows a plan view of a switching ring according to FIGS. 9, 10,

11 to 16 each show different shapes of switching ring hooks in cross section.

Fig. 1 shows the integrated induction and universal motor of a two-motor automatic washing machine drive, bordered by a dash-dotted line, which is fed in _{each case from a single-phase network R 1 KL in both operating modes.} The three strands of the star-connected stator winding of the induction motor 1 are labeled U8, X8, V8, Y8, W8, Z8. The excitation winding of the series connection universal motor 2 fed from the single-phase alternating current network R »M_ has the reference symbol EF, the brushes of the associated rotor 21 are designated as usual with BA. Parallel to the inputs V8 and WS are the two contacts 31 and 32 of a reversing switch 3 provided for the washing operation, the input terminal of which is connected to the pole R of the feeding single-phase network R »W_. In parallel to the terminals 31, 32 is a capacitor C in a manner known per se. The second pole ML of the feeding single-phase network R, ^ is in series with one

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Thermal monitor A connected to the input terminal U8 of the induction motor, which drives the washing drum of a washing machine in washing mode with about 50 drum rpm, for example in an eight-pole version with the interposition of a corresponding belt transmission. Instead of the three strands shown here, the induction motor can also be designed with only two strands. The number of poles of the universal motor should, for example, be equal to two, but g should have a different size than the number of poles of the induction motor 1 J _1. J

$ Figure 2 shows the winding scheme of the stator winding shown in Fig. 1 in a 1 Block diagram showing an eight-pole, three-phase induction motor part which all slots N1 to N24 is of the stator core. Fig. 3 shows the winding scheme of the exciter shown in Fig. 1 f also in a ^{basic circuit:} ": Winding of the two-pole universal motor part arranged in the same stator core. While the winding:

of the induction motor is arranged evenly distributed in all the slots N1 to N24, the winding of the universal motor is - as shown in FIG 3 without further ersieht- \ lent -. only a portion of these grooves. Both of | the induction motor winding as well as the slots occupied by the universal f motor winding have a larger slot cross-section than the remaining slots occupied by the induction motor winding alone. This results in a preferably rectangular sheet metal stator section with an unequal groove size, the larger grooves preferably being arranged in the area of the diagonals of the rectangular sheet metal stator section.

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4 to 6 show three exemplary embodiments of an eight-pole induction motor rotor winding designed according to the invention. In this case, in deviation from the _{number of slots resulting from the formula N 2} = 2p «m ₂ * q ₂ , the rotor has eighteen slots in the exemplary embodiments according to FIGS. The coil width Wj corresponds, as precisely as possible due to this number of slots, to the simple pole pitch of an eight-pole induction motor winding. In the present case, the exact value of the pole pitch would be £ "= 45 ° geometrically; based on the selected number of slots, a practical value for the coil width of Wj = 40 ° geometrically results. 4 readily apparent, 180 ° geometrically.

In Fig. 4 of the eighteen grooves of the laminated rotor core are a total of sixteen grooves, each with a coil side the induction motor winding occupied. This is the maximum possible occupancy rate, if only in each slot one coil side is to be arranged and all coils should have the same copper volume. The in Fig. 4 The induction motor winding shown consists of four pairs of coils, each with two coils connected in series, which have a spatial distance of 180 ° from one another. The coils of each pair of coils are through one uninterrupted winding wire connected in series and by connecting their winding beginnings and winding ends in the connection points K1; K2; K3i K4 four at a time Short circuits interconnected.

It should be expressly pointed out here that the additional short-circuit connection between the connection points of the individual winding beginnings and winding ends has no influence on the principle function of the winding designed according to the invention and is also as such does not result easily. The possibility of a short

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Closing connection in the form of a short-circuiter K shown in FIGS. 4, 5 between the individual connection points K1 to K4 or K1 to K5 is therefore not immediately obvious. The same applies in principle to the winding according to FIG. 6; However, for the sake of clarity, the nine winding ends and the nine winding beginnings of the nine individual coil pairs are not each connected individually, but instead are individually led to the short ^{circuiter K shown as "short-circuit bar 11.} Fig. 6 thus already indicates the technical simplification by the additional short-circuiter K between the connection points of the winding ends and winding beginnings, which is explained in more detail in its practical embodiment in FIG. 8 with reference to the same winding.

During the manufacture of the winding, there is no knowledge of the advantageous embodiment according to the invention of the additional short-circuiter K assume that all coil pairs each with one free The beginning of the winding and a free end of the winding, and thus the entire induction motor winding, not with one continuous uninterrupted winding wire is windable; after winding the single coil pairs are then their tficklungsbegins and winding ends each separately and to connect properly with each other. This is what it is in practice, especially with a larger one Number of coil groups, necessary, the first free winding starts and winding ends of the individual coil groups to be held and marked by means of special aids, e.g. by means of grippers or clamps, and after Completion of the actual winding process to remove the wire insulation from the beginnings and ends of the windings and correctly solder the exposed ends together. These interconnected winding beginnings and winding ends must then be fixed on the shaft, e.g. by bandaging, and against the shaft

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to be isolated. With the. Number of winding starts and The degree of difficulty of such handling increases, especially with regard to careful winding ends Connection of the winding ends, avoidance of excessive imbalance and sufficient centrifugal strength.

Based on the knowledge that the short-circuiter K additionally drawn in FIGS Connection points of the winding ends and winding beginnings of the individual coil pairs the basic function the winding designed according to the invention is not influenced, but for the interconnection of the coil series connections of the coil groups to short-circuit circuits is very advantageous, FIG. 8 represents one based on this consideration From a manufacturing point of view, very useful practical design of the short-circuiter in the form of an electrical one conductive switching ring S with switching ring hooks distributed around the circumference and contacted by the induction motor winding S1 to S9 in Fig. 8. Fig. 7 shows those arranged in the same grooves N1 to N18 of the rotor core Two-pole universal motor winding, of which only one winding is attached to the laminations C6, C7 of the Collector C connected, loop winding shown is.

By arranging the switching ring S on the underside of the In Fig. 8 shown induction motor winding on the one hand and the collector C on the top of the in Fig. illustrated universal motor winding should be indicated that in particular for machine production the two windings advantageously collector and switching ring on opposite end faces of the Rotor winding are to be arranged.

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The one in Pig. 8, the eight-pole induction motor winding according to the invention, which is advantageous for this winding, can be carried out mechanically as follows, e.g. with the help of a flyer, using the electrically conductive switching ring, which is advantageous for this winding: The beginning of the uninterrupted winding wire is, for example, on the switching ring Hook S3 contacted and pulled to slot N3, the coil N3, N1 is wound, the winding wire is pulled without contacting the switching ring S in the sense of a series connection to the next coil of the coil groups containing the coil N1, N3, namely to the slot N12, the coil N12 , N10 is wound, the coil wire is pulled to the next following switching ring hook Sk , placed around it and pulled to the slot N5, then with the winding of the first coil N5, N3 of the next following coil groups N5, N3; N14, N12 started. This winding process is continued until the end of the winding wire has reached the switching ring hook S3 again and the entire winding with nine coil pairs is connected according to the invention without interrupting the winding wire. By hot caulking, the electrical contact and the final mechanical fixing between the switching ring hook and the enclosed winding wire can then take place.

FIGS. 9 and 10 each show, in a longitudinal section, two different embodiments of the one on the left Front side of the rotor encapsulated in a divisible cassette 8 held switching ring S. In the grooves of the The laminated rotor core 9 arranged on the shaft 7 is initially the two-pole universal motor winding 10 radially on the inside and arranged radially on the outside an eight-pole induction motor winding, whose axially protruding beyond the laminated core The winding head bears the reference number 5. The windings are opposite the end face of the laminated rotor core 9 and opposite the shaft 7 by an insulating end plate

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isolated. The one in Pig. 11 shown in a plan view Switching ring S is made of electrolytic copper and has nine switching ring hooks S1 to S9 distributed around its circumference on. These switching ring hooks can corresponding to the various embodiments according to FIGS. 12 to 16 either radially (Fig. 12 to Fig. 14) or axially (Fig. 15, 16) on the switching ring S be formed. The vote the respective different switching ring hook designs can be determined by various parameters, such as the wire thickness, the operational mechanical stress on the winding, the wire tension direction during winding, the necessary contact area between connecting ring hook and wire etc. must be determined.

For an isolated and mechanically secure mounting, the switching ring S is e.g. on the one previously pushed onto the shaft 7 first cassette part 81 of the divisible cassette 8 attached and held in a press fit. Instead of this Press-fit mounting between the inner cassette part 81 and switching ring S could be more favorable in terms of production technology The switching ring can also be provided as a preferably open ring in the inner cassette part 81 to keep embedded. The inner cassette part 81 is preferably composed of one with a view to the hot caulking process temperature-resistant material. As such, the inner cassette part 81 could also have the insulating end disk 12 can be integrated in one piece, but in such a case the insulating end disk 12 would also be a require increased temperature resistance and thus a higher cost of materials.

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In Pig. 9, 10 is the position in dashed form of the Schalttririg hook S6 shown after hot caulking, in which the heat of the insulating coating of the winding wire 13 removed and the winding wire itself is clearly fixed mechanically in the switching ring hook. Advantageously, it is provided that the connections of the winding starts and ends with the Switching ring hook as a whole and thus in particular the outer surface of the switching ring hook free of one Stay insulating cover; this means, in particular, that the winding heads are subsequently impregnated with cast resin no cast resin mass reaches the switch ring hook. In this way, e.g. a winding tester from the outside to the switching ring and. connected to the winding.

Advantageously, it is also provided that the switching ring S with its switching ring hooks S1 to S9 such a test run can be encapsulated in an insulating and protected manner in that finally the second cassette part 82 in the form of an open to the winding head of the rotor winding, the switching ring in its end position to the outside protective cover bell is formed. Appropriately, this cover bell can also be used as a hub dome can be provided for a fan 11 connected separately or in one piece to the second cassette part. the The bell wall of the second cassette part 82 also has a pressure part directed axially onto the winding wire 13 on that the otherwise free winding wire 13 between the winding head 5 and the switching ring hook S6 fixed; for this purpose, as a counterpart to the pressure part of the second cassette part 82, there is a corresponding contact shoulder 811 molded onto the first cassette part 81. In the embodiment according to FIG. 9, the pressure part is the second cassette part 82 as an axially directed pressure lug 821, according to the exemplary embodiment according to FIG.

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additionally pulled up, the winding wire 13 over a larger area supporting pressure plates θ 22 provided with ventilation openings.

Finally, the essential process steps for producing the winding designed according to the invention are briefly mentioned presented once again in summary; from this illustration it can be seen how simple this winding is despite the largely free availability over different usage ratios in the runner in contrast to comparable known solutions is to be manufactured.

a) In the grooves of the laminated rotor core which is provided with an insulating end disk and groove linings and is pressed onto the shaft the universal motor winding is wrapped and contacted with the commutator hook.

b) On the face of the laminated rotor core facing away from the commutator the inner cassette part is plugged onto the shaft and a switching ring preferably with at least one of the coil pair number corresponding number of hooks held on the inner cassette part.

c) The induction motor winding is machined starting from a first switching ring hook with an uninterrupted Winding wire wrapped, with the series connection of the coils belonging to a coil group without contacting the switching ring hook by the spatial angular distance between two successive coils advanced along the circumference of the rotor and between the end of the winding of one coil group and the beginning of the winding of the next Coil group of continuous winding wire around one, preferably in the middle between the winding end and Winding start arranged, switching ring hook is wrapped.

d) By hot caulking, hooks are made in the area of the switching ring the insulation removed from the contacting winding wires and the winding wires in set this area between the switching ring and switching ring hook.

e) After further completion of the rotor, in particular after attaching the slot wedges, pre-balancing and resin isolating the end turns, the rotor is electrically checked; this can be advantageous Way an electrical winding tester to the freely accessible switching ring hook and thus connected winding ends are connected.

f) The outer cassette part is together with the fan wheel pushed on axially, encapsulates the switching ring in a protected and insulated manner and fixes the free ones Winding wires between switching ring and winding head, especially in terms of high centrifugal strength,

characters

Claims

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summary

Electric two-motor drive, especially for driving a washing machine *

The two-motor drive combines a two-pole core in the grooves of a single stator or rotor core Universal motor winding and a higher-pole induction motor winding. The induction motor winding of the rotor is connected to a commutator Universal motor winding of the rotor completely galvanically separated. The induction motor winding of the rotor is made of at least two coil groups, each with at least two, connected in series to form a short circuit Coils in such a way that the voltages induced in each pair of coils during universal motor operation become zero add. An electrically conductive switching ring with switching ring hooks distributed around the circumference is located on the front side of the rotor arranged, in the sense of an uninterrupted winding wire machine production of the coil groups the winding starts and ends of which are continuously wrapped.

An advantageous application results in particular in washing machine drives with high final spin speeds. (Fig. 8)

Claims (17)

gip30H claims 1.Electric two-motor drive, in particular for driving a washing machine, each motor of which can be connected separately to an alternating current network serving as the single supply source, with a stator winding arranged in grooves in a common stator core of a universal motor with the number of pole pairs p _y = 1 on the one hand and an induction motor with the number of pole pairs P ₁ = k «jk ₂ with k ^ 3,5,7 ... and kp = 1,2,3 · *« on the other hand and with a common rotor, whose winding, arranged in slots, consists of at least two groups of coils, each with a short circuit in Series-connected coils with the same coil width and number of coil turns formed with a number of poles corresponding to the number of poles of the exciting induction motor stator field as well as circuits connected to the lamellae of a commutator with a number of poles corresponding to the number of poles of the exciting universal motor stator field and whose total useful number differs from the number of poles and the number of phases U.N d number of slots per pole and strand for a full-hole winding according to the formula N ₂ = 2p-m ₂ -q _{2 is a} determinable number of slots, characterized by the features: P ₁ a) The number of slots is N ₂ = k, g = ·, where k, s2 and integer as well as N ₂ = 2pjist, b) the coil width Wj corresponds to one coil of each coil group, as precisely as possible due to the slot pitch, the simple pole pitch of the induction motor winding, c) the number n ₂ of coils per coil group is n ₂ = g = ·, d) the spatial angular distance between two consecutive coils of a coil group isoC = 2fl P ₁ ^ e) The beginning and end of the winding of the coils connected in series are in the sense of a completely galvanic Separation between universal motor winding and induction motor winding without contact with the commutator connected with each other. > f · im - 17 - VPA 81 P 3 O H DE 2. Electric two-motor drive, in particular for driving a washing machine, each motor of which can be connected separately to an alternating current network serving as a single supply source, with a stator winding arranged in grooves in a common stator core of a universal motor with the number of pole pairs Py «1 on the one hand and an induction motor with the even number of pole pairs p , .r 4 on the other hand and with a common rotor, whose winding arranged in grooves consists of at least two groups of coils, each with at least two coils connected in series to form a short-circuit circuit of the same coil width and number of coil turns, with a number of poles corresponding to that of the exciting induction motor stator field and with the lamellae of one Commutator connected circuits with a number of poles corresponding to that of the exciting universal motor stator field and its total number of uses differs from that due to the number of poles, number of phases and keying ahl per pole and strand for a full-hole winding according to the formula N ₂ = 2p-m ₂ * q _{2 is a} determinable number of slots, characterized by the following features: a) The number of slides is N ₂ = 2k ^, where k ^ pj. and is an integer, b) the coil width Wj corresponds to one coil of each coil group, as precisely as possible due to the slot pitch, the simple pole pitch of the induction motor winding of the runner, c) the number of coils per coil group is n ₂ = 2, d) the spatial angular distance between two consecutive coils of a coil group is /? « ¹ C" · Pj, e) The beginning and end of the winding of the coils connected in series are in the sense of a completely galvanic Separation between universal motor winding and induction motor winding without contact with the commutator connected with each other. - 18 - VPA 81 ρ 3 O H DE 3. Electric two-motor drive according to claim 2, characterized by the following features: c1) The number np of coils per coil group is n ^ 2 or n _D = p _T , if the amount —— a whole and even- C. J. Pj numeric number results; d1) the spatial angular distance is / 3 ³ Pf ⁷ Cl or / 3 = 2'T, if the amount ■ - results in an integer. 'P ₁ P ₁ 4. Electric two-motor drive according to one of claims 1 to 3 »characterized in that that in each slot of a slot occupied by a coil of the induction motor winding only a single coil side the induction motor winding is arranged (Fig. 4). 5. Electric two-motor drive according to one of claims 1 to 3, characterized in that that all the slots are occupied by the coil sides of the induction motor winding, in a part of the slots each only one coil side and two coil sides are arranged in the other part of the slots per slot, all of them Copper volume per slot corresponds to the copper volume of a slot occupied by only one coil side (Fig. 5). 6, electric two-motor drive according to one of claims 1 to 3, characterized in, that all grooves are occupied in the same way with several coil sides per groove (Fig. 6). 7. Electric two-motor drive according to claim 4, characterized in that in a rotor with a total of N _o = 18 slots and a number of poles 2_ = 8 Pt four coil pairs provided and sixteen slots each occupied by one coil side of these coil pairs and two spatially on the circumference of the bore opposite grooves are free of the induction motor winding (Fig. 4). - 19 - VPA 81 P30 H DE 8. Electric two-motor drive according to claim 5, characterized in that at one Slider with a total of Np = 18 slots and a number of poles 2_ = 8 A total of five pairs of coils are provided and six very grooves, each with one side of the coil and two spatially on the circumference of the bore opposing grooves each with two sides of the coil Induction motor winding are occupied (Fig. 5). 9. Electric twin-motor drive according to claim 6, d a through characterized in that a rotor with a total of Np = Ie slots and a number of poles 2_ = 8 all slots with two coil sides of the induction motor winding each are occupied (Fig. 6). 10. Electric two-motor drive according to one of claims 1 to 9, characterized in that that all connection points between each winding start and each winding end of each Series circuit connected by an electrical short circuiter. 11. Electric twin-motor drive according to claim 10, characterized in that geken η ζ e i c h η e t that as a short-circuiter a switching ring arranged in front of one of the two winding heads concentrically to the shaft of the rotor (S) with at least one switching ring = hook for receiving the Short-circuited winding starts and ends are provided is. 12. Electric two-motor drive according to claim 11, in particular for a machine with at least one Flyer wound runner, characterized in that the switching ring (S) with on his Circumferentially arranged switching ring hooks (S1, S2, S3 ...) is provided, which in the sense of a flyer winding with uninterrupted winding wire from the beginning of the winding and winding ends of the coil pairs are wrapped. • ItI Il > • I (t Il • I I I I I t I I · - 20 - VPA 81 P 3 0 H DE 13. Electric two-motor drive according to claim 12, characterized in that the Number of switching ring hooks (S1, S2, S3 ...) at least is equal to the number of coil pairs. 5 14. Electric two-motor drive according to one of the ; Claims 11 to 13, characterized in that a switching ring hook (S1, S2, S3 ...) is contacted by a continuous winding wire, which on the one hand is the winding end of a coil group and on the other hand forms the beginning of the winding of the next coil group. 15. Electric two-motor drive according to one of claims 11 to 14, characterized that the switching ring (S) is arranged in front of that winding head (5) of the induction motor winding which faces away from the collector (C) connected solely to the universal motor winding (6). 20th 16. Electric two-motor drive according to one of claims 11 to 15, characterized in that g e k e η η - 'shows that the connections of the winding \ Begin and end the winding with the switching ring hook in the 25 senses a free of an insulative coating from the outside connectable electrical Wick- ■ averaging PrUfgerätes, j 17. Electric two-motor drive according to one of claims 11 to 16, characterized ! 30 shows that the switching ring in a two-! part insulating cassette (8) can be encapsulated, whose first cassette part (81), which can initially be pushed axially over the shaft (7), serves as a carrier for the concentrically surrounding Switching ring (S) and its second cassette part (82) that can finally be pushed over the shaft (7) of the rotor is designed in the form of a cover bell which is open to the winding head and protects the switching ring (S) from the outside.