KR20150064035A - Large electric drive - Google Patents

Abstract

The present invention relates to a rotor for a large electric drive. In order to simplify the assembly of the rotor according to the invention, the rotor comprises a shaft 1 and an adapter 3, a bearing element 4 and a support element 5, which are respectively arranged radially outwardly on the shaft 1, , Said shaft (1) having a shaft flange (2) projecting radially outwardly from the outer circumferential surface of said shaft at its axial end, said adapter (3) being connected to said shaft flange (2) 4 are connected at least to the adapter 3 and the support element 5 is connected to the bearing element 4 and the shaft 1. [

Description

[0001] LARGE ELECTRIC DRIVE [0002]

The present invention relates to a rotor for a large electric drive.

This type of device is used, for example, in a marine propulsion system in which the components of an electric motor are connected to the propeller of the ship through a propeller shaft. The propeller shaft may comprise two or more shafts connected to one another by a shaft flange and arranged axially in a row.

The components of the electric motor have been installed primarily between two shaft flanges located at both axial ends of the shaft on the shaft. To this end, the poles are mounted on the shaft using a shrink-fit hub structure or bolted to a propeller shaft, artificially enlarged, known as a ball shaft.

The object of the present invention is to simplify the assembling of the rotor.

The problem is solved by a rotor having a shaft, the shaft having a shaft flange projecting radially outwardly from the outer circumferential surface at one axial end thereof, the rotor further comprising an adapter arranged radially outwardly on the shaft, And a support element, wherein the adapter is connected to a shaft flange, the bearing element is connected to at least the adapter, and the support element is connected to the bearing element and the shaft.

The problem is also solved by a large electric drive with a rotor of this type.

By means of the rotor according to the invention, the costs for the assembly of the rotor and the cost of the logistics can be reduced, for example, if a relatively expensive forged part of an artificially enlarged ball shaft is omitted . In addition, expensive and complex magnet wheels implemented as shrink-fit hub structures that are currently in use can be replaced by simple, relatively inexpensive weld parts. In particular, compared to ball shafts, the surface processing of the bearing elements of the rotor according to the present invention is less complex, thus requiring a shorter processing time and additional cost savings.

The rotor according to the invention also permits inexpensive prefabrication of, for example, adapters and bearing elements or supporting elements, wherein the prefabrication is carried out in an efficient manner in electromechanical equipment, for example by means of a high degree of automation . Because the prefabricated components are relatively small compared to the finished large electrical drive, the overall logistics and transportation problems of large components are eliminated.

Pre-fabrication is usually carried out before assembly of the entire rotor, which is performed in the shipyard. In the shipyard, only a simple machine assembly operation is required to assemble the rotor according to the present invention.

It is also desirable that the shaft, which may be implemented as a propeller shaft in particular, need not be specially tailored for the rotor according to the invention. For example, a bolt that secures each adapter to a shaft flange may be extended by the entire width of the adapter.

Finally, the rotor according to the present invention may be used in the manufacture of the bearing element, the support element and / or the adapter, for example, during the pre-production of the rotor in electromechanical equipment, including bolting, Which allows relatively simple tools to be constructed and used for mechanical acceptance.

In one preferred embodiment of the invention, at least part of the bearing element is formed in a lattice form. Due to the lattice design of at least part of the bearing element, the bearing element is very stable and can bear the mechanical load. At the same time, there is less material for the bearing elements, which leads to cost savings and makes the rotor overall lighter.

In another preferred embodiment of the present invention, at least one active component is arranged radially outwardly in the bearing element. The active part may be implemented differently depending on the type of large electric drive, for example as an asynchronous motor as a laminated iron core which may additionally have a squirrel cage. Alternatively, the active component for a permanent magnet exciter or a tractive type asynchronous motor may be a permanent magnet type or an electric winding, which forms a magnetic pole during operation of the large electric drive and when excitation current is applied to the electric windings, Type stimulation.

In this case, it may be considered that the bearing element and the active component are integrally formed, and the active component simultaneously takes on the function of the support element.

In another preferred embodiment of the present invention, the diameter of the at least one active component is equal to or less than the diameter of the shaft flange. Here, the shaft flange need not necessarily be specifically designed for assembling the large electric drive portion. Rather, a conventional shaft flange that can be used without additional assembly of the rotor according to the present invention may also be used.

By virtue of the radial size of at least one active component arranged radially outwardly of the bearing element at least equal to the radial extent of the shaft flange, a particularly small rotor in the radial direction and a particularly large electric drive in the radial direction Can be implemented. In particular, compared with ball shafts having relatively larger diameters, on the one hand the radial installation space can be saved and on the other hand about 10 tons of additional weight can be saved in the large electric drive of the corresponding output have. This is particularly advantageous in the use of rotors or large electric drives in ship propulsion systems because in the case of ship propulsion systems the radial installation space is limited and in some cases a larger installation space in the axial direction is provided without problems It is because.

In particular, the active component can be implemented so that its radial dimension is equal to the radial dimension of the shaft flange. Thereby, on the one hand, the radial compact structure of the rotor and of the large electric drive is achieved, and consequently on the other hand, the lever arm for the formation of the diameter and torque of the rotor is relatively large, The driving unit can provide a relatively high torque.

In another preferred embodiment of the present invention, the adapter and the bearing element are integrally formed, the adapter partially circumscribes the shaft in the circumferential direction, the rotor comprises at least one additional adapter radially arranged on the shaft, At least one additional bearing element and at least one additional bearing element, each additional adapter and each further bearing element being integrally formed, the additional adapter partially circumscribing the shaft in the circumferential direction, each additional The adapter is connected to the shaft flange and the support element and each additional support element are each connected to at least two bearing elements.

Each adapter and each integrally connected bearing element may be embodied in particular as a magnet wheel cup segment, wherein at least two magnetic wheel cup segments circumferentially surrounding the shaft are provided.

For example, the magnetic wheel cup has two pipe halves, each of which is welded and axially separated, each of which is fixed to the shaft flange by screws, for example. For support and radial centering of the magnetic wheel cup segments, each support element is secured to the end of each magnetic wheel cup segment, which is opposed to each adapter. At this time, the adapter and the additional adapter may be formed as circumferentially divided rings, with the two ring halves opposite to each other, and each of the two ring halves is connected to two magnetic wheel cup segments, As shown in Fig. In addition, the inner bore of the support element embodied as a split ring can be mounted without any clearance on the shaft, in particular in form-fitting manner.

Thereby, the adapter and the bearing element form a magnetic wheel cup in which the magnetic wheel is in the form of, for example, a permanent magnet, a laminated iron core, a cage rotor and / or an excitation winding, Pole system can be installed. In this case, the rotor may have a diameter that may be greater than the diameter of the shaft flange, including active components arranged radially outwardly to the bearing element.

The magnetic wheel cup segments are particularly advantageous in that they are simple and inexpensive welded parts. For example, prior to rotor assembly in a shipyard, a magnetic pole may already be mounted on each magnetic wheel cup segment to be electrically wired. This is particularly advantageous in pre-production in electromechanical equipment because it allows for highly automated manufacturing, which is often highly automated compared to shipyards. For example, when assembling a rotor in a shipyard, only the magnetic wheel cup segments, for example, two pipe halves, need to be secured to the shaft flange. In addition, the electrical wiring of the magnetic wheel cup segments must be performed, which is much less complex than the electrical wiring of the magnetic wheel cup segments already carried out in the pre-production.

Through the assembly of the respective support elements, the desired mechanical properties can be achieved since the overall structure of the rotor is torsionally rigid and aligned in the axial direction. This pre-production eliminates the stringent requirements associated with the assembly of large components in general with regard to logistics and transportation. In addition, since the rotor according to the present invention can already be pre-fabricated substantially in electromechanical equipment, the assembly cost of the rotor in the shipyard is reduced to a minimum. Thus, the remaining work steps for assembling the rotor in the ship can also be performed by a shipyard that is not specialized in electric motor assembly.

In another preferred embodiment of the present invention, the support element is embodied as a pole segment of a segmented gearless ring motor, wherein the rotor comprises at least one additional adapter arranged radially outwardly in each of the shafts, and at least one additional Bearing element and at least one further support element configured as a pole segment, each adapter being connected to a shaft flange, and each bearing element being connected to a respective adapter.

For example, the rotor has two pole segments of a gearless ring motor, the two pole segments are oppositely opposed and jointly enclose the shaft. In each support element formed as a pole segment, a respective bearing segment is fixed and these bearing segments are again connected to respective adapters. Each bearing segment and each adapter forms a partial cup, and the associated adapter is secured to the shaft flange. At this time, each pole segment may be welded to an associated partial cup.

Torque generated during operation of the rotor is transmitted to the shaft through each adapter. The pole segments have an inner bore in common as they circumferentially surround the shaft, wherein the pole segments are supported radially inwardly on the shaft, for example without clearance, in particular in the form of a shaped engagement. In this case, the rotor may have a diameter that can be formed larger than the diameter of the shaft flange.

Because the pole segments are simple welded parts that are manufactured inexpensively, expensive and complex structural elements can be saved, especially compared to shrink-fit hub structures or ball shafts. Since pole segments can be fully pre-fabricated in electromechanical equipment, a simple machine assembly operation is required at the shipyard. Since complicated electrical wiring work can already be performed in electromechanical equipment, for example, wiring work of the pole segments to be performed in the shipyard can be minimized.

As a result of the assembly of the respective pole segments and the fixing of the pole segments using the bearing element and the adapter, advantageous mechanical properties can be achieved by implementing an axially aligned rotor structure with torsional stiffness. As a result, dynamic imbalance and fluctuation of the rotor in particular can be prevented.

Pre-production of this type eliminates the expense associated with the assembly of large parts, usually associated with logistics and transportation problems. In addition, since the rotor according to the present invention can already be pre-fabricated substantially in electromechanical equipment, the cost for assembling the rotor in the shipyard is reduced to a minimum. Hence, therefore, the remaining work steps for assembling the rotor in the ship can also be performed by a shipyard that is not specialized in the assembly of electric motors.

In another preferred embodiment of the present invention, at least a portion of the bearing element is formed into a hollow cylindrical shape, the hollow cylindrical portion of the bearing element is coaxially arranged with respect to the shaft, and the inner diameter of the bearing element is larger than the outer diameter of the shaft flange .

For example, the adapter is embodied as a two-piece adapter ring having two adapter ring halves that are opposite to each other and opposite the shaft in the assembled state. The adapter ring is secured to the shaft flange by, for example, bolted joints. In the adapter ring, a bearing element, which may in particular comprise the active part of an asynchronous motor, for example a cage rotor of an asynchronous motor, is fixed. The bearing element is also connected to a support element, which is embodied as a two-part support ring, for example, with two support ring halves surrounding the shaft and opposite to each other in the assembled state. The inner bore of the support element formed as a two-piece support ring is mounted on the shaft without clearance, in particular in a shape-fitting manner.

With this arrangement, the bearing elements in the form of a cage rotor, in particular, are reliably retained, while the torque generated during operation is transmitted to the shaft. To this end, the bearing element is adapted to have a correspondingly torsional stiffness. Particularly after the support ring is assembled, the structure has torsional rigidity and is aligned in the axial direction, so that the dynamic imbalance and fluctuation of the rotor can be reliably prevented.

With this type of configuration, a magnetic wheel in the form of an expensive and complex, in particular shrink-fit hub structure, which has been required in the past, can be replaced by simple and inexpensive combustion parts and rotating parts. In this case, efficient pre-fabrication can be carried out, for example, because bearing elements in the form of active parts of, for example, asynchronous motors can be manufactured entirely in electromechanical installations. This type of construction of the asynchronous machine is particularly robust, making it ideal for ship propulsion systems where very strict and demanding operational requirements are given. In the shipyard, only a simple machine assembly operation is required to assemble the complete rotor, for example "threading" the shaft to the hollow cylindrical portion of the bearing element for assembly of the bearing element. On the other hand, since complex electrical wiring has already been carried out in electrical machinery, this work step is no longer necessary to be carried out in the shipyard.

Since the inner diameter of the bearing element is larger than the outer diameter of the shaft flange, it is possible to construct an electric motor with a particularly large torque, since the torque depends on the length of the lever arm.

In another preferred embodiment of the present invention, the bearing element is connected to a laminated iron core of a synchronous machine or an asynchronous machine. Therefore, the bearing element supports the laminated iron core of the rotor, and a space-saving structure is particularly possible.

According to the present invention, it is possible to manufacture a large electric drive unit in the form of a synchronous motor, an asynchronous motor, a gearless ring motor, or a salient pole motor in accordance with an embodiment of the present invention.

In the following, the present invention will be described in more detail with reference to the embodiments shown in the drawings.

1 is a schematic side view of a rotor according to the present invention.
Figure 2 is a schematic side view of a first embodiment of a rotor according to the present invention;
Figure 3 shows a bearing element formed integrally with an adapter according to the first embodiment.
Figure 4 shows a support element and an additional support element according to the first embodiment.
Figure 5 is a schematic side view of a second embodiment of the rotor.
Figure 6 is a schematic side view of a third embodiment of the rotor.

1 is a schematic side view of a rotor according to the present invention. The rotor has a shaft (1), which has a shaft flange (2) at its axial end. Here, the outer diameter of the shaft flange 2 is larger than the remaining diameter of the shaft 1. An adapter 3 arranged radially outwardly to the shaft 1 is fixed to the shaft flange 2. The adapter 3 is again secured with a bearing element 4 to which the support element 5 is finally fixed. The support element 5 is likewise connected to the shaft 1.

Depending on the preferred large electric drive, the bearing element 4 may have an inner diameter larger than the outer diameter of the shaft flange 2. [ Alternatively, the outer diameter of the bearing element 4, the adapter 3 and / or the support element 5 may be formed to be equal to or less than the outer diameter of the shaft flange 2.

In addition, the bearing element 4 may be formed at least partly in a lattice form and / or at least partially in a hollow cylindrical form.

It is further contemplated that the active component 6 may be fixed radially outwardly to the bearing element 4, wherein the active component 6 is embodied as a bearing element 4. Reference numerals not shown in Fig. 1 refer to other drawings.

Figure 2 is a schematic side view of a first embodiment of a rotor. The rotor includes a shaft (1), and an axially extending portion of the shaft (1) is provided with an additional shaft (11) coaxial with respect to the shaft (1). The shaft 1 and the shaft 11 each have a shaft flange 2 or an additional shaft flange 12 at their axial ends and the two shaft flanges 2 and 12 are in axial contact. For the connection of the two shafts 1 and 11, there is provided a bolted joint 7 connecting the two shaft flanges 2 and 12 to each other.

The shaft 1 has a bearing element 4 and an adapter 3 integrally formed with the bearing element 4. [ The bearing element 4 is formed as a magnetic wheel cup segment, in which the rotor has at least two magnetic wheel cup segments circumferentially surrounding the shaft 1. A magnetic wheel cup is formed which is coaxially arranged with respect to the shaft (1) through at least two magnetic wheel cup segments and is rotatably connected with the shaft (1). A bearing element 4 formed as a magnetic wheel cup segment is arranged radially outwardly to the shaft 1 and an adapter 3 is fixed to the shaft 1 by means of bolts Is connected to the shaft flange (2) of the shaft (1) by means of the joint (7).

In addition, the bearing element 4 is connected to the support element 5, which is again connected to the shaft 1. At this time, the support element 5 is embodied as a multi-part support ring, and the parts of the support ring are arranged coaxially with respect to the shaft 1 to surround the shaft 1. The connection between the support element 5 and the bearing element 4 can again be embodied as a bolted joint 7, in which an alternative connection, for example a weld connection, can also be provided.

The rotor also comprises an active component 6 which is arranged radially outwardly to the bearing element 4 and is fixed to the bearing element 4 by means of for example another bolted joint 7 . The active part may have, for example, a permanent magnet, a laminated iron core, a cage rotor and / or an exciter winding, in particular a pole system in the form of a pole of a synchronizer.

3 shows a bearing element 4 formed integrally with the adapter 3 according to the first embodiment. The bearing element 4 thus constructed is the aforementioned magnetic wheel cup segment. The magnetic wheel cup segment has, at the rear axial end of the bearing element shown in Fig. 3, an area with perforations and a larger outer diameter, with the corresponding area of another magnetic wheel cup segment, at the shaft flange 2 A segmented adapter flange that can be fixed is formed.

Fig. 4 shows a support element 5 according to the first embodiment. The support element 5 is embodied as a multi-part support ring and has a left support ring half 15 arranged on the left side of FIG. 4 and a right support ring half 16 arranged on the right side. When the rotor has two magnetic wheel cup segments, the shaft 1 is enclosed by the left support ring half 15 and the right support ring half 15 in a cavity. At this time, in each half of the left support ring half 15 and the right support ring half 16, for example, in Fig. 4, each upper half is axially positioned and connected to one of the magnetic wheel cup segments. Thus, the other half of each of the left support ring half 15 and the right support ring half 16 rests on and connects to another magnetic wheel cup segment in the axial direction. The left support ring half 15 and the right support ring half 16 are combined to form a split support ring and the inner bore of the support ring is mounted on the shaft 1, .

Figure 5 shows a schematic side view of a second embodiment of the rotor. The rotor has a shaft (1), which has a shaft flange (2) at its axial end. In the axial extension of the shaft 1, another shaft 11 likewise having a shaft flange 12 is arranged, the two shaft flanges 2, 12 being axially in contact, The connection of the additional shaft 11 is formed by, for example, a bolt joint.

In the shaft flange 2, an adapter 3 arranged radially outward to the shaft 1 is fixed. The adapter 3 is again secured with the bearing element 4 and the bearing element is fixed to the bearing element 5 and the bearing element is embodied as a pole segment of the segmented gearless ring motor in the scope of the present embodiment. The pole segments have active components 6 arranged radially outward.

The rotor has at least a total of two pole segments of this type, these pole segments circumferentially surrounding the shaft 1 and arranged concentrically with respect to the shaft. The pole segments all have one inner bore, the pole segments being supported radially inwardly on the shaft 1, for example without clearance, in particular in the form of a shaped connection.

Additionally and additionally depending on the number of pole segments, the rotor has at least one additional adapter and at least one additional bearing element, and at least one further adapter is connected to the shaft flange 2 as well as to each additional bearing element . At least one additional bearing element is again associated with each additional pole segment.

In this case, since each adapter 3 and each bearing element 4 can be integrally formed, they form a partial cup. In this case, each pole segment may be welded to the corresponding part cup.

Figure 6 shows a schematic side view of a third embodiment of the rotor. The rotor has a shaft (1), which has a shaft flange (2) at its axial end. The axially extending portion is provided with another shaft 11 which also has a shaft flange 12 which is in contact with the shaft flange 2 of the shaft 1 so that both shafts 1, May be connected to rotate together.

In the shaft flange 2, an adapter 3 arranged radially outwardly to the shaft 1 is fixed. The bearing element 4 is again fixed to the adapter 3 and the bearing element 5 is fixed to this bearing element. In the context of the present embodiment, the bearing element 4 is formed in a hollow cylinder and is arranged concentrically with respect to the shaft 1, in which case the bearing element 4 may be formed at least partly in the form of a lattice. In this case, since the inner diameter of the bearing element 4 is larger than the outer diameter of the shaft flange 2, the shaft 1 must be "sandwiched" into the hollow cylindrical bearing element 4 for the assembly of the rotor.

The active component 6 can be fixed to the bearing element 4 or the bearing element 4 can be embodied as the active component 6 at the same time. In this case, the active part 6 can be implemented as a cage rotor of, for example, an asynchronous motor.

The adapter 3 can be embodied as a two-part adapter ring, for example, with two adapter ring halves arranged in opposite directions to each other surrounding the shaft 1 in the assembled state. Correspondingly, the support element 5 can also be embodied as a two-piece support ring, with the two support ring halves similarly arranged on opposite sides of the shaft 1 in the assembled state. The inner bore of the support element 5, embodied as a two-part support ring, can be attached without any clearance on the shaft 1, in particular in the form of a shaped connection.

In summary, the present invention relates to a rotor for a large electric drive. In the present invention, in order to simplify the assembly of the rotor, the rotor includes a shaft having at its axial end a shaft flange protruding radially outward from the outer circumferential surface of the shaft, and an adapter arranged radially outwardly of the shaft, Element, and a support element, wherein the adapter connects with the shaft flange, the bearing element connects at least with the adapter, and the support element connects with the bearing element and the shaft.

Claims (9)

A shaft (1) having a shaft flange (2) projecting radially outward from the outer peripheral surface of the shaft (1) at its axial end,
A rotor for a large electric drive, comprising an adapter (3), a bearing element (4), and a support element (5) arranged on the shaft (1)
The adapter 3 is connected to the shaft flange 2,
The bearing element 4 is connected at least to the adapter 3,
The supporting element (5) is connected to the bearing element (4) and the shaft (1). 2. A rotor as claimed in claim 1, wherein at least part of the bearing element (4) is formed in a lattice form. 3. The rotor according to claim 1 or 2, wherein at least one active component (6) is arranged radially outwardly on the bearing element (4). 4. The rotor of claim 3, wherein the diameter of the at least one active component (6) is equal to or less than the diameter of the shaft flange (2). 5. A bearing according to any one of claims 1 to 4, characterized in that the adapter (3) and the bearing element (4) are integrally formed, the adapter (3) partially circumscribes the shaft (1)
The rotor has at least one additional adapter arranged radially outwardly on the shaft 1, at least one further bearing element, and at least one additional support element 15,
Each additional adapter and each additional bearing being integrally formed, the additional adapter surrounding the shaft 1,
Each additional adapter 3 is connected to a shaft flange 2,
The supporting element (5) and each additional supporting element (15) are connected with at least two bearing elements (4), respectively. 5. Device according to any one of claims 1 to 4, characterized in that the support element (5) is embodied as a pole segment (25) of a segmented gearless ring motor,
The rotor has at least one additional adapter arranged radially outwardly in each of the shafts 1, at least one further bearing element and at least one additional support element 15 embodied as a pole segment,
Each adapter 3 is connected to a shaft flange 2,
Each bearing element (4) being connected to a respective adapter (3). 4. A bearing element according to any one of claims 1 to 3, wherein at least a part of the bearing element (4) is formed in a hollow cylindrical shape,
The hollow cylindrical portion of the bearing element 4 is arranged coaxially with respect to the shaft 1,
The inner diameter of the bearing element (4) is larger than the outer diameter of the shaft flange (2). 8. The rotor of claim 1, 2 or 7, wherein the bearing element (4) is connected to a laminated iron core of a synchronous machine or an asynchronous machine. A large electric drive having a stator and a rotor according to any one of claims 1 to 8.

Images