CN214255007U - Electric slip ring and wind generating set - Google Patents

Abstract

The utility model provides an electrical slip ring and wind generating set. The electrical slip ring includes a stator including an integral frame for mounting the brush holder, a rotor rotating relative to the stator, and a brush holder mounted on the stator. Through adopting the excellent integral type installation frame of stability, can improve the axiality of sliding ring, the plane degree of PCB board brush yoke and the holistic antidetonation effect of sliding ring.

Description

Electric slip ring and wind generating set

Technical Field

The utility model relates to a sliding ring technical field, more specifically relate to an electric sliding ring, especially are used for wind generating set's electric sliding ring.

Background

The electric slip ring is an electric component used for communicating the rotating body with another part and transmitting energy and signals, belongs to a conventional component on a wind turbine generator, is usually installed in a generator shaft system at the connecting position of an impeller and a cabin and is used for supplying power to the impeller and realizing signal acquisition and control on the impeller.

Conventional contact slip rings are generally used for transmitting power and low-speed communication messages (for example, 10MW and below), and even if the conventional contact slip rings are used in 100MW, the communication requirements are not high, so that the communication stability is not high, and occasionally intermittent communication loss occurs due to packet loss and error codes. However, if the hundred million communication links of the electrical slip ring need to be connected to the safety links of the unit, packet loss and error codes are not allowed to occur, and the unit is stopped when communication signals are intermittently interrupted, so that the traditional contact electrical slip ring cannot meet the communication requirements, and a brand new design is needed to meet the application requirements.

SUMMERY OF THE UTILITY MODEL

Therefore, the present invention is directed to an electrical slip ring with improved physical layer parameters, and in particular, to an electrical slip ring with improved physical layer parameters suitable for high speed communication.

According to an aspect of the present invention, there is provided an electrical slip ring, the electrical slip ring comprising a stator, a rotor rotating relative to the stator and a brush holder mounted on the stator, the stator comprising an integral frame for mounting the brush holder.

Preferably, the integrated frame may include a pair of ring-shaped end plates and a side plate disposed between the pair of ring-shaped end plates, and the brush holder may be mounted on the side plate.

Preferably, the stator may be fitted around the outer circumference of the rotor, the side plates may be a pair, the pair of side plates may extend along an axial direction of the electrical slip ring, one or more brush holders may be fixed to the pair of side plates along a direction perpendicular to the axial direction, the brush holders may be provided with brushes and PCB boards, and the brushes may contact with the slideway of the electrical slip ring through a gap between the pair of side plates.

Preferably, the single mesh wire of the electrical slip ring may include a first wire pair, a second wire pair, and a shield wire disposed between the first wire pair and the second wire pair, and the slideway may include a first slideway, a second slideway, and a shield slideway for contacting brushes of the first wire pair, the second wire pair, and the shield wire, respectively, and the shield slideway may be disposed between the first slideway and the second slideway.

Preferably, the network cable may include a communication cable, and one end of the shield cable may be grounded.

Preferably, the slide of the electrical slip ring may have a diameter of 35mm to 50 mm.

Preferably, the one-piece frame may be a cast aluminum frame.

Preferably, the brush of the electrical slip ring may be a silver alloy brush, and the slideway of the electrical slip ring may be a copper ring slideway.

Preferably, both ends of the brush holder may be supported by the respective side plates, respectively, and the side plates may include fastening holes for connection with the brush holder and weight-reducing holes.

According to another aspect of the present invention, there is provided a wind turbine generator system comprising an electrical slip ring as described above connected between components that rotate relative to each other.

The utility model provides an electric sliding ring's physical layer parameter can be improved.

Through adopting the excellent integral type installation frame of stability, can improve the axiality of sliding ring, the plane degree of PCB board brush yoke and the holistic antidetonation effect of sliding ring.

In addition, by mounting the brush holder in a direction perpendicular to the axial direction of the electrical slip ring, rather than in the axial direction, it is possible to avoid the brush holder or the PCB board from being too large in span, thereby ensuring stability of the brush holder or the PCB board.

In addition, a shielding slide way is added between the wire pairs in the single network wire, so that near-end crosstalk can be effectively reduced, and the anti-interference level is effectively increased.

In addition, return loss and near-end crosstalk can be improved by optimizing the size of the slideway of the electric slip ring, and the cost investment of equipment can be reduced by reducing the size of the slideway.

Drawings

Fig. 1 shows a partial view of an electrical slip ring according to an embodiment of the present invention;

fig. 2a, 2b and 2c show schematic views of a stator side outgoing line and a rotor side outgoing line of an electrical slip ring and a connector according to an embodiment of the invention;

fig. 3 and 4 show schematic diagrams of adding a shielding wire between wire pairs in a single network wire of an electrical slip ring and correspondingly adding a shielding slideway according to an embodiment of the present invention.

List of reference numerals:

1-a stator; 2-a rotor; 10-a one-piece frame; 11-side plate; 12-an annular end plate; 15-lightening holes; 16-fastening holes; 18-a connector; 19-a connector; 20-a brush holder; 21-a PCB board; 22-a brush; 23-a connection terminal; 23-1-a first connection terminal; 23-2-a second connection terminal; 23-3-a third connection terminal; 23-4-a fourth connection terminal; 23-5-a fifth connection terminal; 23-6-sixth connection terminal; 31-a slide; 32-insulating spacers; 51-a first pair of wires; 52-a second wire pair; 53-shielded wire.

Detailed Description

In order to better understand the technical idea of the present invention for those skilled in the art, the following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings, in which like reference numerals refer to like parts throughout.

The electric slip ring belongs to conventional parts on the wind turbine generator system, is usually installed in a generator shaft system at the connecting position of an impeller and an engine room, is used for supplying power to the impeller and realizing signal acquisition and control on the impeller, and has a low communication speed, for example, a low-speed communication mode used conventionally: profibus dp, Can, Tcp, general communication rate does not exceed 10MW, rarely uses 100MW communication rate, and what the conventionality saw is that video communication and system upgrade are used, so the attention of the electric slip ring of 100MW communication rate on the market is not high, and besides the conventional traditional contact electric slip ring, the non-contact electric slip ring dealing with high-speed communication at present also starts to be popularized, with the abundance of capacitive coupling and optical joints, but under the large environment of the same price of wind and fire at present, the cost of the non-contact electric slip ring is too high, which limits its wide application in the wind power field.

When the traditional contact type electric slip ring transmits hundred million communications, IEC 61158-2-2014 puts definite requirements on the physical layer of a communication link of the electric slip ring, but most manufacturers of the electric slip ring at present do not notice the problem in design. Some specific devices (such as hydraulic variable pitch machines) employ electrical slip rings with two hundred million communication links: the Powerlink1 and the Powerlink2 (as shown in fig. 3) are mutually standby and are serially connected into the secure link, packet loss and error codes can cause unit shutdown, and the root cause of the packet loss and error codes of the slip ring communication link is that the electrical slip ring physical layer is unqualified. There are three important metrics affecting the physical layer of the link: when the margin of any one or more of the three parameters is insufficient, the physical layer test is not qualified, and finally intermittent packet loss and error codes of the slip ring can be caused. When two groups of Powerlinks have packet loss at the same time, the safety chain is interrupted, and the unit is stopped. Therefore, the utility model provides an improve the physical layer parameter of electric sliding ring, be used for high-speed communication to provide support for the sliding ring.

The electrical slip ring is improved from multiple aspects to improve physical layer parameters and improve parameter margin.

On the one hand, the slide of electrical slip ring is the weakest point of electrical slip ring communication with the position of brush (for example, brush-holder stud, brush bundle, carbon brush etc.) contact, for the contact stability of reinforcing electrical slip ring, the utility model discloses an integral type installation frame installs the brush yoke, compares with the frame of assembled, and it can be more stable to adopt the integral type frame to support and install the brush yoke, and the structure antidetonation effect is better.

As shown in fig. 1, fig. 1 shows a partial view of an inner portion of an electrical slip ring with a housing removed, the electrical slip ring includes a stator 1, a rotor 2 rotating relative to the stator 1, a brush holder 20 is mounted on the stator 1, the rotor 2 includes an insulating tube, and a metal slideway 31 and an insulating interval 32 disposed between adjacent metal slideways 31 are formed on the insulating tube (preferably, the thickness of the insulating interval 32 may be 2mm, and the diameter of the insulating interval 32 may be 6mm larger than that of the metal slideway 31). In use, the brushes 22 on the brush holder 20 of the electrical slip ring are in sliding contact with the slideway 31, thereby enabling rotational transmission. Here, the stator 1 of the electric slip ring includes an integrated frame 10 for mounting a brush holder 20, the brush holder 20 may include brushes 22, a PCB 21 and a connection terminal 23, the integrated frame 10 may include a pair of ring-shaped end plates 12 and a side plate 11 disposed between the pair of ring-shaped end plates 12, and the brush holder 20 may be mounted on the side plate 11 through a fastening hole 16 on the side plate 11. Integral type frame 10 is as the skeleton of electric sliding ring, can be the core construction that guarantees that electric sliding ring operation is stable, and this kind of integral type frame 10's stability is good to the outer plane of frame needs to satisfy reasonable plane degree requirement in order to ensure that brush yoke 20 installs smoothly and stably, can improve the axiality of sliding ring from this, the plane degree of PCB board brush yoke and the holistic antidetonation effect of sliding ring, this kind of integral type frame 10 plays crucial effect to the stability of sliding ring communication link. Preferably, the integral type frame can be cast aluminum frame, and the aluminum product belongs to low magnetic material, can promote anti-interference effect.

Preferably, as shown in fig. 1, the side plates 11 are a pair of side plates 11 located at both sides of a metal slide 31 of the rotor 2 in a radial direction, the pair of side plates 11 extend along an axial direction of the electric slip ring, and one or more brush holders 20 are fixed to the pair of side plates 11 in a direction perpendicular to the axial direction, for example, such that relatively long sides of the brush holders 20 are perpendicular to the axial direction, and the brushes 22 on the brush holders 20 may contact the slide 31 of the electric slip ring through a gap between the pair of side plates 11. By mounting the brush holder 20 perpendicular to the axial direction of the electrical slip ring, rather than along the axial direction, it is possible to prevent the brush holder or the PCB from easily shaking due to a too large span, thereby causing a change in contact resistance (or even causing the electrical slip ring to fail), thereby ensuring stability of the brush holder or the PCB.

In addition, the side plates 11 may be provided with lightening holes 15 to reduce the weight as much as possible and reduce the material cost while ensuring the stability of the frame.

On the other hand, the large size of the slideway can cause large contact resistance, the contact resistance can have influence on two sets of parameters of Return Loss (RL) and near-end crosstalk (NEXT), and particularly has maximum influence on the Return Loss (RL), and the diameter of the slideway can be preferably reduced to be less than 45mm, so that the contact resistance is reduced, and the interference tolerance is improved. In addition, the space between the runners is taken into account for the cables to pass through, so the size cannot be too small, and the combined test inventor finds the most suitable runner diameter to be in the interval of 35mm to 50 mm.

On the other hand, high-speed communication requires the use of a dedicated communication connection interface, and especially in a hundred-million communication environment, the reliability of the connector position has a great influence on the communication stability. Fig. 2a, 2b and 2c show stator side outgoing lines and rotor side outgoing lines as well as connectors 18 (stator side outgoing line connectors) and 19 (rotor side outgoing line connectors), and the rotor side outgoing lines of the conventional electrical slip ring are PG outgoing lines, and with the connectors, the outgoing lines of the cable are bent, which finally causes fatigue accumulation of the cable at the PG position, and affects the performance. Here, preferably, an M12 type connector, which is easy to install and has high communication stability, may be used.

On the other hand, a network cable for communication is a finished cable twisted in pairs, and the twisted pairs need to be partially stripped when connecting terminals, however, it should be noted that the twisted pairs are important for suppressing near-end crosstalk (NEXT), and the twisted pairs cannot be too much stripped, and the near-end loss (NEXT) margin is reduced by destroying the twisted pairs, so that the twisted pairs should be destroyed as little as possible to ensure the near-end loss (NEXT) margin. In other words, the communication line connected to the PCB 21 should follow the principle of maintaining twisted pairs while satisfying the turning radius.

On the other hand, the utility model provides an increase shielding passageway between the interior line pair of single net twine to reduce near-end and crosstalk. As shown in fig. 3, as an example, the electrical slip ring provided by the present invention may include five groups of lines, from left to right in fig. 3, which may be a power supply (AC 230V/20A), a DP communication (DC 24V Profibus), an Ethernet communication (DC 24V/1A Ethernet) and two groups of Powerlink communication links (DC 24V/1A Powerlink1 and DC 24V/1A Powerlink 2), respectively, and since the Ethernet communication links and the Powerlink communication links (especially in the case of high-speed communication) are sensitive to interference, it is proposed to add shielding slideways in these three groups. Taking the PowerLink2 communication link in fig. 3 as an example in conjunction with fig. 1, 3 and 4, a single mesh wire includes a set of wire pairs (twisted pair), namely, a first wire pair 51 (e.g., the first wire pair 51 shown in fig. 4, the orange-white-orange wire pair shown in fig. 3, corresponding to the metal runners No. 20 and 21 shown in fig. 3) and a second wire pair 52 (e.g., the second wire pair 52 shown in fig. 4, the green-white-green wire pair shown in fig. 3, corresponding to the metal runners No. 23 and 24 shown in fig. 3), in order to reduce near-end crosstalk, a shielding wire 53 is added between the first wire pair 51 and the second wire pair 52, and a shielding runner is added between the first runner (e.g., the 20 th and 21 st runners) corresponding to the first wire pair 51 and the second runner (e.g., the 23 th and 24 th runners corresponding to the second wire pair 52), that is, as shown in fig. 3, a 22 nd runner is added as a shielding runner between the metal runners No. 21 and 23 st and 23 nd, the corresponding brushes of the shield wire 53 contact the shield runners, wherein the shield wire 53 is not responsible for transmitting signals, e.g., the shield wire 53 may be grounded, which may be an empty runner of the plurality of metal runners not used for transmitting signals, thereby reducing near-end crosstalk issues between the first wire pair 51 and the second wire pair 52.

More specifically, as shown in fig. 1, a first wire pair 51 and a second wire pair 52 of a network wire for a PowerLink2 communication link may be coupled to a first connection terminal 23-1, a second connection terminal 23-2, a fourth connection terminal 23-4, and a fifth connection terminal 23-5 on a brush holder 20, respectively, a shield wire 53 between the wire pairs may be coupled to the third connection terminal 23-3, and a ground wire of the network wire may be coupled to the sixth connection terminal 23-6.

Similarly, a shielding slideway may be added to other communication links, as shown in fig. 3, and No. 10 and No. 16 slideways are used as shielding slideways in the communication lines of Ethernet and PowerLink1, respectively.

The shielding slide ways are added between the wire pairs of a single network wire, but the shielding slide ways can also be added between the network wire and a power wire, between the network wire and the network wire or other communication wires.

The reasonable addition of the shielding slide way can reduce the problem of near-end crosstalk (NEXT) and effectively increase the anti-interference level.

On the other hand, the reasonable selection of the materials of the electric brush and the slideway can also improve the parameter margin of the physical layer, for example, the electric brush 22 of the electric slip ring can be a silver alloy electric brush, a silver-copper alloy or a gold-copper alloy electric brush, the slideway 31 of the electric slip ring can be a copper ring slideway, the copper ring can be polished, and the surface can also be plated with a gold layer.

The improvement of each aspect is to meet the qualification of physical parameters of the electrical slip ring, and preferably, the reserve margin of insertion loss, Return Loss (RL) and near-end loss (NEXT) of three important indexes affecting a physical layer is more than or equal to 2db so as to ensure the stable operation in the unit.

While the present invention has been particularly shown and described with reference to particular embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims (e.g., various features of the invention may be combined to obtain new embodiments). Such combinations, modifications and improvements are intended to be within the scope of the invention.

Claims (10)

1. Electrical slip ring comprising a stator (1), a rotor (2) rotating relative to the stator (1) and a brush holder (20) mounted on the stator (1), characterized in that the stator (1) comprises an integrated frame (10) for mounting the brush holder (20).

2. Electrical slip ring according to claim 1, characterized in that the integrated frame (10) comprises a pair of ring-shaped end plates (12) and a side plate (11) arranged between the pair of ring-shaped end plates (12), the brush holder (20) being mounted on the side plate (11).

3. Electrical slip ring according to claim 2, characterized in that the stator (1) is fitted around the outer circumference of the rotor (2), the side plates (11) are a pair, the pair of side plates (11) extends along the axial direction of the electrical slip ring, one or more brush holders (20) are fixed to the pair of side plates (11) along a direction perpendicular to the axial direction, the brush holders (20) are provided with brushes (22) and PCB boards (21), and the brushes (22) are in contact with the slideway (31) of the electrical slip ring through a gap between the pair of side plates (11).

4. Electrical slip ring according to claim 3, characterized in that the single mesh wire of the electrical slip ring comprises a first wire pair (51), a second wire pair (52) and a shield wire (53) arranged between the first wire pair (51) and the second wire pair (52), the slideway (31) comprising a first slideway, a second slideway and a shield slideway for contacting brushes of the first wire pair (51), the second wire pair (52) and the shield wire (53), respectively, the shield slideway being arranged between the first slideway and the second slideway.

5. Electrical slip ring according to claim 4, characterized in that the network line comprises a communication line, one end of the shielding line (53) being connected to ground.

6. Electrical slip ring according to claim 1, characterized in that the diameter of the slideway (31) of the electrical slip ring is 35 to 50 mm.

7. Electrical slip ring according to claim 1, characterized in that the one-piece frame (10) is a cast aluminium frame.

8. Electrical slip ring according to claim 3, characterized in that the brushes (22) of the electrical slip ring are silver alloy brushes and the runners (31) of the electrical slip ring are copper ring runners.

9. Electrical slip ring according to claim 3, characterized in that the brush holder (20) is supported at both ends by the respective side plate (11), the side plate (11) comprising fastening holes (16) for connection with the brush holder (20) and lightening holes (15).

10. Wind park according to any of claims 1-9, wherein the wind park comprises an electrical slip ring according to any of claims 1-9, which is connected between components rotating relative to each other.

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