BE1027815A1 - Auxiliary motor and drive equipped with it - Google Patents

Abstract

Auxiliary motor with a rotor (2) and a stator (3), wherein: - the rotor (2) contains a plane of symmetry (12) through its axis of rotation (X-X') and a number of magnet pairs (6a, 6b) in a magnet holder ( 7) of non-magnetically conductive material, wherein the magnet pairs (6a, 6b) are divided into two series, respectively a first series of magnet pairs (6a) directed with their north pole (N) towards an axial end (5b) of the rotor ( 2) and a second series of magnet pairs (6b) directed with their north poles (N) towards the other axial end (5b) of the rotor (2), the stator (3) is composed of two U-shaped stator coils (14) which are on either side of the rotor (2) and spaced therefrom with their free ends (21) facing each other, each stator coil (14) being composed of a U-shaped magnetically conductive stator core (16) and formed a closed coil by an electrically conductive wire (18) wound around the stator core (16) along the length of the stator core (16) and which is shorted by connecting the ends together.

Description

Auxiliary motor and drive equipped with it. { The present invention relates to an auxiliary motor. 9 More specifically, the auxiliary engine of the invention is intended to | to cooperate with a main engine or other main 9 drive to form a compound engine or : sanddrift, where the auxiliary engine is powered by the main engine or | 10 drive is driven and as a result itself develops a drive power that added to the drive power of the main engine gorges FOR a combined power that is greater than the power of the hay engine without auxiliary engine. 35 This means that for a given load with a given power absorbed, the main rotor will have to develop less power in conjunction with the auxiliary motor than without the auxiliary motor,

Thanks to the auxiliary motor, the efficiency of the composite motor will improve considerably. To this end, the invention relates to an atypically constructed 254 auxiliary motor with a rotor and a stator, wherein: the rotor is intended to be driven in rotation by a motor or other drive, whereby the rotor includes a first and a second axial end face and includes a symmetry surface around its axis of rotation and a series of magnet pairs encased in a magnet holder of non-magnetically conductive material, each magnet pair having a north pole and a south pole with the | north pole at the Gen axial end of the rotor and the { south pole at the other axial end, and where the | magnetic pairs in the circumferential direction are distributed over the | > end faces in two series, respectively a first 9 series of one or more magnet pairs on one side of the | symmetry plane and a tweed series of one or more 9 magnetic pairs zaan the other side of the symmetry plane, | where the magnet pairs of the first series with their 9 north poles are directed to one axial end of the 9 rotor, while the magnet pairs of the Lweede series with their 9 north poles are directed towards the other axial end of 9 the rotor, - the stator is composed of at least two U-shaped stator coils, each on one side of the rotor and with their free ends opposite to and spaced from one or more magnetic pairs of the rotor, each stator coil being composed of a U-shaped magnetically conductive stator core and a sicted coil Formed by an electrically conductive wire wound around the core along the length of the core or a portion thereof and which is short-circuited by joining the ends together Le.

Characteristic of this atypical construction compared to a classic electric motor are:

- the fact that the auxiliary motor does not require an external electrical power source, unlike a cyclic electric motor that requires power to function:

- the fact that the stator coils are closed in themselves, in contrast to Lot's electrocoils

{ a classic electric motor with the ends on a | power source must be connected; the fact that at the huipmctor a large sky rush | between the stator and the rotor is preferred, this | 5 in contrast to a classic electric motor in which 9 the air gap must be as narrow as possible for a good 9 efficiency; | = the core of the stator parts of the auxiliary motor is made of a 9 strong magnetically conductive material, 9 LG has the smallest possible magnetic resistance, this in contrast to a kaasic slektromctor in which the 9 core is made up of plates from dynamobiik, this with the in order to maximize magnetic resistance on l'aucoult currents; - the magnet holder of the rotor is made of a magnetically non-conductive material, with the intention of making maximum use of the magnetic field of the magnets without magnetic losses as occurs in classical electric motors due to the transport of the field lines in the iron yoke or jacket of the rotor or stator.

It is especially surprising that by (short) circuiting the stator coils in itself, the effect is obtained as described here, namely an increase in the power of the composite motor. When the coils short-circuit in a classic electric motor, no power is developed at all, Preferably, the at least two stator coils lie in the same plane around the axis of rotation of the rotor and lie

‘ BE2019/5857

A : with their legs symmetrical with respect to a plane through the axis of rotation. { according to a practical implementation method, the magnet holder is | 5 of the rotor is wheel-shaped with an inner ring and 9 an outer ring connected by spokes defining areas 9 in which the magnet pairs are located. | Such a magnet holder is relatively easy to realize, for example in non-magnetically conductive plastic, it can be dimensioned so that it can absorb the strong repulsive and attractive forces between magnets on the | magnets in place. In this case it is preferable that the magnets are wedge-shaped and that each magnet pair fills the space between two spokes of the magnet holder.

Such magnets can be obtained, for example, by laser cutting. The magnets of the magnetic pairs are, for example, applied back to back against each other by means of a press or the like in the space between the spokes of the magic holder.

Preferably, the magnets are permanent magnets, although electromagnets are not excluded.

An advantage of permanent magnets is that they do not consume or require any power.

Necdymium magnets are preferred here. | The rotor can be filled in two diametrically opposite 9 spaces between the spokes with stabilization icon | 2 that allows the rotor to be balanced and that Levens { strengthens the rotor's roi as a flywheel. 9 The stabilization lead forms the separation between the first and 9 the Lweede series of magnetic racks, 9 10 | The magnets are preferably enclosed in the spaces between the spokes by two strong plastic covers that are not magnetically conductive, for example covers made of polycarbonate, which are attached to the magnet holder on both sides. For safety reasons, the rotor can be wrapped with a carbon fiber reinforced cloth. fixed through the middle. made of epoxy resin, in order to be able to stop any particles that may come loose from the rotor. The stator cores of the stator coils are preferably designed as a solid iron core, for example from hot-rolled steel such as steal S235JR.

This type of material has the property of having a very low magnetic resistance and thus a very high magnetic conductivity, which enhances the favorable operation of the auxiliary motor.

| BE2019/5857 ; 6 9 As far as the stator is concerned, it is preferable that the 9 windings of the stator pulley extend in the opposite direction | on the longitudinal direction of the stator core, so that the field lines 9 of the magnetic field through the core are oriented perpendicularly 9 Bb to the windings, whereby the currents induced in the 9 windings are maximal and the intended result of the invention is also maximal. Preferably, each stator core is provided on both free ends with a pole shield of magnetically conductive material with a capture face directed towards the rotor for capturing the magnetic field from the magnet pairs of the rotor.

These pole cleans are intended for maximum capture and alignment of the magnetic field lines in axial direction within this capture surface, forcing a maximum number of traps to pass through the stator core. The invention also relates to a motor or drive composed of an auxiliary motor according to the invention which is rotationally driven or can be driven by a drive motor or other drive.

In order to better suit the features of the invention, a preferred embodiment of an auxiliary motor according to the invention and of a drive equipped therewith is described below, by way of example without any limiting character, with reference to the appended | drawings, in which: figure 1 schematically and in perspective shows an auxiliary motor 9 according to the invention; 9 figure 2 shows a view of the rotor according to arrow F2 9 in figure 1, with an indication of the relative | position of the pole shoes: 9 figure 3 shows a view like that of figure 2, 9 id but the rotor twisted by an angle H: [ figure 4 shows a view according to arrow Fd in figure 9 1, but with the rotor twisted by 590" : figures 5 and 6 show a view like that of figure à, but in two possible no-load rest positions of the rotor; figure 7 shows a graph of the voltage in the stator coils as a function of time: figure 8 schematically represents an electrical circuit of a stator winding of the auxiliary motor of figure 1 : figure 9 shows an alternative embodiment of figure 2 . The auxiliary motor 1 shown in figure 1 according to the invention comprises a rotor 2 and a stator 3.

The rotor 2 is provided with a shaft 4 with which the rotor 2 is mounted freely rotatably about a geometric axis X-X' in fixed bearings (not shown). The stator 3 is mounted in a non-magnetically conductive fixed frame (not shown).

; & BE2019/5857 The rotor £ is provided with two axial end faces 5, respectively a first end face Sa on one side and a 9 Weede axial end face 5b on the other side, 3 > The rotor 2 contains a series of magnets 6 mounted # in a magnetic holder 7 from a non-magnetically conductive | plastic, | The magnetic holder 7 is in this case designed as a wheel 9 19 with an inner ring 8 fixed on the shaft 4 and an outer ring 53 connected to the inner ring & by means of radial spokes 10 defining spaces 11 in which the splined magnets 6 are included. The magnets & are pressed in pairs back to back as magnetic pairs 52 and 6b in the spaces 11, the magnetic pairs Ga and 6b having a north pole N and a south pole Z with which the magnetic pairs 6a and 6b are directed towards the end faces 5a and 5b.

The rotor 2 is divided by a plane of symmetry 12 passing through the geometric axis K-X' into two halves, respectively a first half containing a series of magnetic pairs ba directed with their north poci N towards the first end face Sa of the rotor 2 and with their south pole Z oriented towards the Liweede end face Sb, while the second half contains a second series of magnetic pairs &b whose polarities are reversed and which are thus directed with their north pole N towards the second end face 5b of the rotor 2 and with their south pole Z to the first end plane ba.

in the example shown in the figures there are { twenty-eight magnets, which are divided into fourteen { magnet pairs 5a and 6b, respectively seven magnet pairs | ba of the first series and seven macneeil pairs 6b of the | 5 second series. 9 The number of magnetic pairs 6a and #6 can vary from the | Preliminary number, starting from one magnet pair 6a and one 9 magnet pair 60 Lot of several magnet pairs of each type 6a and 9 In the example, the magnets 6 are strong permanent | magnets, in particular neodymium magnets, which fill the space 11 in pairs between two spokes 10 of the magnet holder 7. In the example, all spaces 11 are filled with magnets, with the exception, however, of two diametrically opposite spaces 11 which are formed by the symmetry plane 12 are cut in half and which are filled with stabilizing lead 13, which, as it were, forms a separation between the magnetic pairs Sa and 55. The spaces 11 are preferably covered with a cover (not shown) made of polycarbonate or the like on either side of the rotor and the magnet holder 7 are fixed to contain the magnets 6 and the stabilization loco 13. The stator 3 is composed of two S-shaped stator coils 1e located in a parallel plane through the

I BE2019/5857 : 10 geometrical axis of rotation X-X' of the rotor 2, these stator coils 14 being symmetrically located with respect to the median face 15 of the rotor 2. | 5 The stator coils 14 are constructed around U-shaped | stator cores 16 of a magnetically conductive material such as 2235JR hot-rolled steel or the like | with very good magnetic conductivity. : 10 The Stator cores 16 are located with their legs 17 in line with each other, parallel to the geometric axis X-X' 9 and with their free ends 18 facing each other and on a | distance of the rotor 2 from the magnets 6 in rotor 2. The legs 17 are at the same distance from the geometric axis NX. The stator coils 14 are closed spaces formed by an electrically conductive wire 18 that runs along the length of the stator core 16. is wound around the stator core in windings 19 and which is shorted by electrically connecting the ends together, either directly or indirectly through the other stator coil.

Both coils can be connected in series or in parallel without loss of auxiliary motor properties.

The windings 19 extend perpendicularly to the longitudinal direction 20 of the stator core 16 and are arranged over the full or near full length of the stator core 16 in closely adjoined windings, e.g. 3000 turns per stator coil 14; For example, the windings 13 around the stator core 16 are wound from insulated copper wire and additionally electrically insulated from the core material by means of ; transformer paper and high electrical tape; insulation resistance. ; 10 Each stator core 16 is on both free ends 2 | provided with a pipe shoe 22 of magnetically conductive material, for example of the same material as that of | the stator cores 16.

In the example of the drawings, the pole shoes 22 are formed from sheet material in which the shape of a ring segment has been cut out, for example by laser cutting. The pole shoes 22 are attached to the ends 21 and extend perpendicular to the legs 17 of the stator cores 16, with a brine face 23 which faces the rotor & and which is radially situated opposite the macerator 6. The surface of the brine face 23 is greater than the surface area of the cross-section of the stator core 16 at its free ends 21.

The stator 3 with its pole shoes 22 has a plane of symmetry 24 at right angles to the median plane 25 of the stator cores 15.

| 15 BE2019/5857 The pole shoes 22 extend circumferentially with | a width À that is at least equal to the width B of | the magnetic pair ba, 6b of the rotor 2 at the same radial distance, for example over a À width of approximately three | a pcol shoes 22, as shown in figure 2, and in the radial direction have a length © which is equal to or greater than the radial length D of the magnets €9. An air gap 26 is left between the pole shoes 22 and the rotor Z. with a width E of, for example, 30 mm, preferably of at least 50 mm and most preferably of at least 70 mm measured in axial direction X-X'. Such a large air gap 26 is advantageous to ensure that the magnetic field lines choose the path of least magnetic resistance through the pole cores and thus as few field lines as possible escape from the gap 26 by jumping along the circumference of the rotor between the magnets. of a single magnetic pair Sa, 6b.

The magnetic equilibrium with regard to the distance E between the rotor 2 and the stator capture surfaces 23 must be adjusted as a function of the power of the drive motor 28, the desired speed of the rotor Z and the total shaft power of the auxiliary motor 21 and of the drive motor. that one strives for.

In figures 1 and 2 the rotor is shown in a rest position, wherein the magnet pairs 6a are situated on one side of the plane of symmetry 24 and the magnet pairs 6b are situated symmetrically on the other side of this plane of symmetry 24 and the stabilization lead 13 is situated around this plane. symmetry plane 24 extends, | in fact there are two rest positions, namely a first | 5 rest position like that of figures 1 and 2 in which the 9 magnetic pairs Ga are located at the top and magnet pairs 6b at the bottom and a second rest position in which the rotor is over half a turn with respect to the first rest position | turned and in which the magnet pairs 6a are now located at the bottom 9 12 and the magnet pairs &b are located at the top.

9 At rest, the rotor will automatically return to one of the two rest positions under the influence of the magnetic forces between the magnets 6 and the pole shoes 22, which are then in equilibrium. A rotation of the rotor 3 is indicated in the remainder of the description by an angular rotation H of the rotor 3 with respect to the first state of rest in Figures 1 and 2, as shown in Figure 3. Figure 4 shows a state in which the rotor 2 has been rotated through an angle H of 90[deg.] and the stabilizing eye is located between the pole shoes 22.

Figure 5 shows the situation of the first rest state, where H is equal to 0°. In this condition the magnetic field lines 27 are highly concentrated in the stator cores 16 and in the air gaps where the field lines are aligned almost axially by the presence of the pole shoes. | use can be made of the magnetic field caused by the magnets 6.

9 5 As a result, in this position, a strong magnetic flux F is created in the stator cores 16, which in this case runs in a 9 clockwise direction. | Figure 6 shows the situation of the Lweede : 18 rest position, where H is equal to 180°, In this case the 9 magnetic flux has reversed direction and now pays off in # C counterclockwise, The auxiliary motor 1 is intended to be driven by a electric motor 28 or any other drive as shown in Figure 4, which together form a composite motor or drive 29 capable of driving a generator or other mechanical load 30, Experimental can be done in the following way to discover the surprising effect of the per se closed stator parts 14 are shown. When the stator coils 14 are electrically interrupted and the rotor 3 is driven without load by the drive motor 28. If a certain speed is reached and then the stator positions are suddenly (short)-circuited, it is surprisingly found that the motor 29 suddenly starts to accelerate strongly and at the same time the

; BE2019/5857 28 absorbed electrical current and electrical power # sharply decrease, | This calculates that by short-circuiting the stator coils 14 the auxiliary motor 1 supports the drive motor 28 9 and supplies additional power 9 such that more power becomes available from the drive rotor 9 to drive a load 30, : 12 Due to the varying magnetic field in the stator coils 22 9 a scanning is induced in the windings of 1% of the stator parts 22. 9 Measurement of the voltage V in an open stator coil 14 in 15 function of time in milliseconds when actuated of the rotor 3 at 1500 revolutions per minute produces a graph as shown in figure 7. This graph gives an atypical result in the sense that with a pure inductive circuit one has a pure sinusoidal voltage variation with a period of 40 ms at 1500 cycles per minute. minute in which the maximum voltage is built up in a quarter of the period, being 10 ms, and cok is again reduced to zero in the same period of time.

in the case of the invention a periodic graph is obtained with the same period T of 40 ms as the pure sine form, but which deviates from the pure sine form in that in this case the maximum voltage is built up from zero in a much shorter time span, namely in the example of figure 7 in a time span ti and t3 of 2.5

- BE2019/5857 16 ms and then scaled back to zero over a much longer £2Z and td of 17.5 ma. The zeros correspond to the positions in which the stabilizing lead 13 passes past the pole shoes 22, namely at an angular displacement H of 20° and 270° of the 9 rest positions of the rotor 2. : The magnetic flux F through the stator cores 16 and the current | 10 through the closed stator coils in the same sense, | At 50” and 270°, the magnetic flux suddenly changes from | direction and builds cp in a very short span of time tl and t3. The stator coil 14 subject to the emerging flux itself produces a magnetic field in the opposite direction to the emerging flux caused: by the rotating rotor 2, this occurs in the time periods tZ and té. During this cycle, the stator coil 14 builds its own magnetic field around the stator coil 14 onp. The work of LENZ plays here, who states that an induction current has the direction in which it explains the cause of its creation.

The flux F through the stator coil 14 thereby causes a tReverse flux during the time periods t2 and td. When the magnetic field and the [lux change in short the time spans tl and t3, on the other hand, a co-flux is created

| 47 BE2019/5857 and the inductive resistance gives the stator coil 14 its built-up power (by its own magnetic field). | The windings 19 of the stator coils 14 are characterized | & by their winding resistance Bw and their winding capacitance | oh. 9 The windinos resistance RW is determined by the electrical 9 resistance of the windings 19, which is, for example, around 62 | 19 Ohm lies in front of an insulated copper wire at 30000 windings. The windings 19 that are placed next to each other provide the winding capacitance Cw, This means that between Lwee L5 windings 19 of a stator coil 14 a parasitic capacitance is built up as schematically represented in figure B. It is this capacitance built up in the time periods t2 and 14 for the operation of the auxiliary motor 1 that is important, and which functions as an internal electromagnetic source in the time periods t1 and Li.

During the rotation of the rotor 2 with its magnets 6, the stator coils 14 can be viewed as in the electrical diagram of {Figure 8. The sum of the stray capacitances between each winding 19 of the stator coil 14 is indicated in this diagram as a capacitance Cw which parallel with the windings 1% and their winding resistance Ew appear.

It can be deduced from this diagram that all properties are present to enable the short-circuited stator coils 14 to be regarded as an internal electrical circuit with source (winding capacitance CW) # and connected resistor RW. { 5 During the time spans t2 and te, the stator coil 14 9 builds up its magnetic field and stores the energy in its 9 magnetic field.

At the transition to the time intervals ti and $ t3, this accumulated energy is suddenly returned to 9 its external source, being the rotor 2, by magnetizing the iron stator core 16 as a result of the aforementioned co-flux, whereby a Lorentz force is created. in the core material of the stator core 16 which is oriented in the direction of rotation of the rotating field of the rotor 2, resulting in an acceleration of the rotor 2. 15 It is clear that the number and shape and dimensions of the magnets 6 and magnetic pairs Ga and 6b can be different, as well as those of the magnet holder 7, 20 Also the shape and dimensions of the nool shoes can be optimized and can overlap in width with a different number of magnets 6, with a width A that is greater or less than the width B of a moon & or of several adjacent magnets 6 together. 25 The pole shoes 22 can be omitted if necessary, whereby the ends 21 of the legs 17 of the stator core itself act as a capping surface 23 with a sufficiently large surface and with a sufficient overlap with one or more magnets 6 of the rotor 2,

9 Figure 3 shows an example of a rotor 2 { where there are only two pairs of magnets, namely one | magnet pair Ga and one magnet set pair 66 which is almost a | complete haive circle sector. | In this case it is preferable that the poles 22 9 are also wider, for example with a width A 9 which also covers almost a semicircular sector. 9 12 It is not excluded that for the same rotor 2, two or more stators 3 are used. t appropriately, for example two stators 9 3 which are rotated through an angle of 90° to each other 9, It is by no means impossible that the two stator parts 14 do not extend in the same plane through the rotation axis XX" of the rotor 2, but that for example the stator coils extend in one plane or in two planes perpendicular to the axis of rotation In this case the 2 pcol shoes 22 can for instance be provided laterally against the legs 17 of the stator core 16 .

It goes without saying that the drive motor 28 need not necessarily be an electric motor, but any other type of motor or drive.

The present invention is by no means limited to the embodiment described by way of example and shown in the figures, but an auxiliary motor according to the invention and drive equipped therewith can be provided in all kinds of forms.

: 20 : and dimensions are realized without departing from the scope of the invention.

Claims (1)

Conclusions. | ll.” Hull motor with a rotor (2) and a stator (3), therefore | 5 characterized in that: 9 - the rotor (2) is intended to be driven in rotation by a drive motor (28) or other drive, 9 the rotor {2} having a first and second axial | end plane (Ba,5b) and a plane of symmetry (12) through it: +9 its rotation axis {X-X'} and contains a number of magnet pairs (6a, 6b} | which are contained in a magnet holder (7) of non-magnetically conductive material, each pair of magnets having a 9 north pole (N} and a south pole (2) with the north pole # at one axial end (5) of the rotor {2} and the south pole 9 at the other axial end (5), and wherein the 9 magnet pairs (ba,6b} are circumferentially distributed over the end faces (5) in two series, respectively a first series of gene or more magnetcaren ita, 6b) on one side of the plane of symmetry (125 and a second series of sen or more magnsel pairs (6a,6b} on the other side of the plane of symmetry {12}, where the magnetic pairs (6a} of the first series have their north pole (IN) directed to one axial end (ha) of the rotor {2} , while the magnet pairs (6b} of the second resks are directed with their north pole (N) towards the other axial end {5b} of the rotor { 2}, - the stator (3) is composed of at least two U-shaped stator coils {14}, each on one side of the rotor (2) and with their free ends {21} opposite one or more magnet pairs (64, 6D} from the rotor {2} and at a distance from it, each stator coil (14) being composed of a | 29 BE2019/5857 | U-shaped magnetically conductive stator core (16) and sen | closed coil {(l4a) formed by an electrically conductive | wire (18} wound along the length of the stator core (16) or a portion thereof around the stator core (16) and shorted by connecting the ends together.9 2.7 Auxiliary motor according to claim 1, characterized by that | the at least two stator coils (14) are located in a same plane 9 through the rotation axis {(XX"} of the rotor {2} and 9 19 symmetrical with respect to a plane through the rotation axis 9 (X-X'}. Auxiliary motor according to claim 1 or 2, characterized in that the magnet holder {7} of the rotor {7} is wheel-shaped with an inner ring (8) and an outer ring (9) connected by spokes (10) defining spaces in which the magnet pairs (Ga, 6D) are caught. Auxiliary motor according to claim 3, characterized in that the magnets (63) are wedge-shaped and each magnet pair (63, 6D} fills the space {13} between the pointed spokes (10) of the magnet holder (7). according to claim 3 or 4, characterized in that the magnets (6) of the magnetic pairs (6a,6b} are arranged back to back in the space ({ilj between the spokes {10} of the magnet holder (7), An auxiliary motor according to any one of the preceding claims, characterized in that the magnetic holder {7} is made of plastic. Axis BE2019/5857 ASH 7. Rotary motor according to any one of the preceding claims, characterized in that the magnets (6) are permanent magnets. | 3 B. Hulomotor according to one of the preceding claims, characterized in that the magnets (6) are necdymium magnets | to be. | Auxiliary motor according to one of Claims 3 to 8, characterized in that the magnetic pairs (6a, 6b} each fill a space {il} between the spokes (10}, 19. Auxiliary motor according to one of claims 3 to 3, characterized in that the magnets {6} in the spaces {11} between the spokes (10) are enclosed by two plastic covers which are fixed on both sides. . il. Auxiliary motor according to claim 10, characterized in that the covers are made of polycarbonate. Auxiliary motor according to any one of the preceding claims, characterized in that the rotor {2} is encased in a carbon fiber reinforced cloth fixed by means of epoxy resin. Auxiliary motor according to any one of the preceding claims, characterized in that the stator core (16 ) of the stator coils {14} is full of iron core, . BE2019/5857 24 14,- Auxiliary engine according to one of the preceding conclusions, | thereby marked that the statorkxerr {16} Of the stator coils {14} is made of hot-rolled steel, | preferably made of steel S235JE, F15. Auxiliary motor according to one of the preceding claims, characterized in that the windings {13} of the stator coil {14} extend icod right to the longitudinal direction {20} of the stator core (16). 9 10 16. Auxiliary motor according to claim 15, characterized in that the windings (13) of the stator coil (14) are arranged over the full or almost complete length of the stator core {16}. Auxiliary motor according to any one of the preceding claims, characterized in that the windings (13) around the stator core (16) are electrically insulated by means of transformer paper and of high insulating resistance tape. Rotary motor according to one of the preceding claims, characterized in that each stator core (16) is provided on its two free ends {21} 18 with a pcol shoe (22) made of magnetically conductive material with a brine surface {2) directed towards the rotor {2). 23) for capturing the magnetic field from the magnetic pairs (6a,6b} of the rotor {2}, intended for maximum capturing and aligning the magnetic field lines {27} in axial direction (X}2'), perpendicular 32 of BE2019/5857 i.e. Auxiliary motor according to claim 18, characterized in that the ool shoes (22) are formed from sheet material which is perpendicular to the direction of the legs {17} of the stator core ( 16}, at the surface of |5 the brine surface (23) is larger than the surface area of the cross-section of the stator core (16) at its free ends {21}, : 20. Auxiliary motor according to claim 19, dardcor marked 9 10 that the pole shoes (22) have the shape of e and ring segment # extending in width (A), viewed in circumferential direction, 9 over at least the width (BR) of one magnet pair | {ba,65b} of the rotor {2}. 21. Auxiliary motor according to claim 20, characterized in that the pole shoes {22} have the form of a ring segment which extends in width (A) over the combined width of two to three magnet pairs (6a, Sb) of the rotor ( 2). Auxiliary motor according to claim 20 or 21, characterized in that the pulley shoes (22) have a radial length ({C!) which is equal to or greater than the radial length (D) of the magnet pairs {approx. 66}, 23.7 Hull motor according to one of Claims 16 to 22, characterized in that the pole shoes {22} are made of the same material as that of the stator cores {16}, ; BE2019/5857 26 9 24. Auxiliary engine according to any one of claims 18 to 23, | characterized in that between the pole shoes (22) and | the rotor is left with an air gap (26) with a width 9 {E) of, for example, 30 mm, preferably of at least 50 mm | 5 and preferably at least 70mm in axial direction {X-X'} 9. 9 25,- Motor or drive, characterized in that it is | composite auxiliary motor {1} according to any one of the preceding claims which is driven or may be driven 9 by a drive motor (28) or other drive.