CN219499159U - Electric excitation slip ring - Google Patents

Abstract

The utility model discloses an electric excitation slip ring, which comprises a rotor structure, a stator structure, a flange structure arranged between the rotor structure and the stator structure, a support fixedly arranged on the flange structure and a stop rod with one end fixedly connected with the support, wherein two ends of the stop rod are respectively provided with a joint bearing, one end of the stop rod is rotationally connected with the support through the joint bearing, the other end of the stop rod extends along the radial direction of the flange structure to form a free end, the free end can be connected with an external fixing device, a connecting mechanism is arranged on the support, and the stop rod is detachably connected with the support through the connecting mechanism. The electric excitation slip ring disclosed by the utility model converts sliding friction between the stop rod and the stop arm into rolling friction of the joint bearing, so that vibration and grinding are reduced.

Description

Electric excitation slip ring

Technical Field

The utility model relates to the technical field of variable-pitch electric slip rings of wind generating sets, in particular to an electric excitation slip ring.

Background

With the importance of renewable energy sources and the progress of scientific technology, wind power is receiving more and more attention, and the proportion of wind power in the whole power system is increasing. It is known that wind power is generated by pushing blades to rotate by wind power and driving a generator to rotate at the same time, wind energy is converted into mechanical energy so as to generate electric energy, however, wind speed is not constant, so that the rotating speed of the blades is unstable, fluctuation of voltage and frequency of the electric energy generated by the generator is caused, and therefore, how to make the wind power generator generate stable electric energy is a problem which puzzles people for many years. With the appearance and application of the doubly-fed generator, the situation of unstable wind power generation is improved to a great extent, and great contribution is made to grid-connected operation of the fan.

Doubly fed generators, also known as alternators, are typically constructed from three rotors, stators and air gaps. The stator core of the AC excitation generator is uniformly distributed with grooves of the same shape, and the grooves are mainly used for embedding stator windings, so that three-phase current passing through the stator can generate a rotating magnetic field. Typically, the stator is directly connected to the mains frequency grid, and the rotor is connected to the grid via a converter for ac excitation of the rotor.

Because there is inevitably some friction between the carbon brush on the stator and the slip ring on the rotor, the stator is liable to twist or twist when the rotor rotates. In order to prevent the stator from twisting, a stop arm (refer to fig. 1) in the form of a shifting fork is installed on the stator, a stop rod is fixedly installed on a flange, the stop rod is parallel to the axis of the flange, one end of the stop rod passes through an opening of the stop arm, and the stop arm is stopped by sliding friction between two metals, so that a great amount of grinding is generated at a contact position, and meanwhile, the slip ring is easy to vibrate greatly.

Disclosure of Invention

The utility model discloses an electrically excited slip ring, which aims to solve the problems that in the prior art, a stop arm in a shifting fork mode is adopted for stopping, so that contact point abrasion is aggravated, a large amount of abrasive dust is generated, and grinding vibration is caused.

In order to achieve the above object, the technical scheme of the present utility model is as follows: the utility model provides an electric excitation sliding ring, includes rotor structure, stator structure, sets up flange structure between rotor structure and stator structure, sets firmly in flange structure's support and one end and support fixed connection's stop lever, the both ends of stop lever are provided with joint bearing respectively, the one end of stop lever is rotated through joint bearing and support and is connected, the other end extends along flange structure's radial direction and forms the free end, and this free end can be connected with external fixing device, be provided with coupling mechanism on the support, stop lever and support pass through coupling mechanism and dismantle the connection.

Further, the connecting mechanism comprises a connecting bolt, a through hole is formed in the center of the bracket corresponding to the joint bearing, and the end part of the connecting bolt sequentially penetrates through the through hole and the joint bearing and is in threaded connection with a locking nut.

Further, the stator structure comprises a stator, a collecting ring sleeved outside the stator, a tinned copper plate and a plurality of electric brushes, wherein the electric brushes are equally divided into two groups, the two groups of electric brushes are respectively arranged at two ends of the tinned copper plate, insulating fixing frames are respectively fixedly arranged at edges of two ends of the tinned copper plate, and each electric brush is in contact with the collecting ring.

Further, the electric excitation slip ring comprises an encoder, wherein the encoder is used for recording the rotation position of the electric excitation slip ring.

Further, the electric excitation slip ring comprises a Hall sensor, wherein the Hall sensor is used for recording the rotating speed of the electric excitation slip ring.

Further, the thickness of the tin-plated copper plate is 2mm.

The electric excitation slip ring disclosed by the utility model has the beneficial effects that:

according to the sliding friction type grinding device, the joint bearings are arranged at the two ends of the stop rod, friction between the stop rod and the support is reduced through lubrication of the joint bearings, sliding friction between the stop rod and the stop arm is converted into rolling friction of the joint bearings, and vibration and grinding are reduced.

Through setting up the radial direction with the detent lever along the sliding ring, during the locking, connect the free end of detent lever on the outside fan fixed knot of sliding ring constructs, stop the sliding ring from radial direction for the sliding ring is difficult for producing extra radial force, thereby makes stator and sliding ring coaxial, guarantees the stability of sliding ring operation.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions of the prior art, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it will be obvious that the drawings in the following description are some embodiments of the present utility model, and that other drawings can be obtained according to these drawings without inventive effort to a person skilled in the art.

FIG. 1 is a schematic view of the overall construction of a prior art suspension arm;

FIG. 2 is a schematic diagram of the overall structure of the electrically excited slip ring disclosed by the utility model;

fig. 3 is an enlarged view of a portion a in fig. 1;

FIG. 4 is a schematic structural view showing the inside of a stator structure in an electrically excited slip ring according to the present disclosure;

fig. 5 is a top view of the tin-plated copper plate of the present disclosure;

fig. 6 is a front view of the tin-plated copper plate of the present disclosure.

In the figure: 1. a flange structure; 2. a stator structure; 21. a collecting ring; 22. tin-plated copper plate; 23. a brush; 24. a housing; 3. a stop lever; 4. a bracket; 5. a knuckle bearing; 6. a connecting mechanism; 61. a connecting bolt; 62. a lock nut; 7. an insulating fixing frame; 8. an encoder; 9. hall sensor.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more clear, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to fig. 1 to 6 in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 2, an electrically excited slip ring comprises a rotor structure, a flange structure 1, a stator structure 2 and a stop rod 3, wherein the stator structure 2 is fixed and is used for being connected with a cabin; the rotor structure can rotate along with the hub bin, the electric excitation slip ring is connected with the hub main shaft through the flange structure 1, and the slip ring is stopped in the radial direction through the stop rod 3.

In combination with fig. 2 and 3, a bracket 4 is fixedly arranged on the outer side of the stator structure 2, the bracket 4 is in an L-shaped arrangement, and the horizontal part of the bracket 4 is attached to the outer wall surface of the stator structure 2 and is fixedly connected with the outer wall surface of the stator structure through bolts. The two ends of the stop rod 3 are respectively provided with a joint bearing 5, one end of the stop rod 3 is rotationally connected with the bracket 4 through the joint bearing 5, the other end extends along the radial direction to form a free end, and the free end can be connected with an external fixing device. During stopping, the free end of the stop rod 3 is connected to a fan fixing structure outside the slip ring, the slip ring is stopped in the radial direction, so that the slip ring is not easy to generate extra radial force, meanwhile, the friction between the stop rod 3 and the support 4 is reduced through the self lubrication action of the joint bearing 5, the sliding friction between the stop rod 3 and the stop arm is converted into the rolling friction of the joint bearing 5, and vibration and grinding are reduced.

The stator structure 2 and the stop lever 3 are detachably connected by a connecting mechanism 6. The connecting mechanism 6 comprises a connecting bolt 61, a through hole is formed in the center of the bracket 4 corresponding to the knuckle bearing 5, the end part of the connecting bolt 61 sequentially penetrates through the through hole and the knuckle bearing 5 and is in threaded connection with a lock nut 62, limiting of the knuckle bearing 5 is achieved under the limitation of the lock nut 62 and the vertical part of the bracket 4, the stop rod 3 is stopped in the axial direction, and then the slip ring is stopped in the axial direction.

Referring to fig. 4 and 5, the stator structure 2 includes a stator, a slip ring 21 sleeved outside the stator, a circuit board, a brush 23, and a housing 24, and the stator, the slip ring 21, the tin-plated copper plate 22, and the brush 23 are all disposed inside the housing 24. Since the circuit board in the prior art generally adopts a PCB, copper with a thickness of 0.1mm needs to be placed on the PCB, and the electrical signal on the brush 23 is transmitted to the external cable through the conductive property of the copper. The application replaces the PCB board with a 2mm thick tin-plated copper plate 22, increasing the conductive cross section and thus increasing the current density.

With reference to fig. 4 and 6, the transverse cross sections of the tin-plated copper plate 22 and the collector ring 21 are parallel, the edges of the two ends of the tin-plated copper plate 22 are respectively fixedly provided with an insulating fixing frame 7, under the action of the insulating fixing frame 7, a space is formed between the tin-plated copper plate 22 and the outer wall of the collector ring 21, interference between the tin-plated copper plate 22 and the collector ring 21 is avoided, the use stability is improved, and power and signals are effectively transmitted to the collector ring 21.

The electric brushes 23 are a plurality of, a plurality of electric brushes 23 divide equally into two groups, two groups of electric brushes 23 are respectively arranged at two ends of the tinned copper plate 22, a cable interface used for being connected with an external cable is arranged at the center of the tinned copper plate 22, an external cable is inserted into the cable interface, electric signals can be generated due to the fact that the lower end of each electric brush 23 is in contact with the collector ring 21, the tinned copper plate 22 has conductivity, the electric brushes 23 transmit the electric signals to the tinned copper plate 22, and current transmission is achieved.

Because the existing slip ring has no rotation speed recording and position recording functions, an encoder 8 and a Hall sensor 9 are arranged at the end part of the stator structure 2, so that the slip ring can record the rotation speed and the rotation position of the slip ring. The working principle of the slip ring is that the transmission direction of current is changed through the contact friction between the stator and the rotor, so that the functions of power transmission, excitation, signal transmission and data transmission are realized.

The implementation principle of the application is as follows: the stop rod 3 is connected with the support 4, the limit of the joint bearing 5 at one end of the stop rod 3 is realized under the limit of the vertical part of the lock nut 62 and the support 4, the stop rod 3 is stopped in the axial direction, during stopping, the free end of the stop rod 3 is connected to a fan fixing structure outside the slip ring, the slip ring is stopped in the radial direction, and the positions of the stop rod 3 are respectively limited in the axial direction and the radial direction, so that the axial and the radial of the slip ring are limited, the stop of the slip ring is realized, in the stopping process, the friction of the stop rod 3 is reduced due to the lubrication of the joint bearing 5, and the vibration and the grinding are reduced.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

Claims (6)

1. The utility model provides an electric excitation slip ring, includes rotor structure, stator structure (2), sets up flange structure (1) between rotor structure and stator structure (2), sets firmly in support (4) and one end and support (4) fixed connection's stop lever (3) of flange structure (1), a serial communication port, the both ends of stop lever (3) are provided with joint bearing (5) respectively, the one end of stop lever (3) is passed through joint bearing (5) and support (4) and is rotated and be connected, the other end extends along the radial direction of flange structure (1) and forms the free end, and this free end can be connected with external fixing device, be provided with coupling mechanism (6) on support (4), stop lever (3) and support (4) can dismantle through coupling mechanism (6) and be connected.

2. The electrically excited slip ring according to claim 1, wherein the connecting mechanism (6) comprises a connecting bolt (61), a through hole is formed in the center of the bracket (4) corresponding to the knuckle bearing (5), and the end portion of the connecting bolt (61) sequentially penetrates through the through hole and the knuckle bearing (5) and is in threaded connection with a lock nut (62).

3. The electrically excited slip ring according to claim 1, wherein the stator structure (2) comprises a stator, a collector ring (21) sleeved outside the stator, a tin-plated copper plate (22) and a plurality of brushes (23), the plurality of brushes (23) are equally divided into two groups, the two groups of brushes (23) are respectively arranged at two ends of the tin-plated copper plate (22), insulating fixing frames (7) are respectively fixed at edges of two ends of the tin-plated copper plate (22), and each brush (23) is contacted with the collector ring (21).

4. The electrically excited slip ring according to claim 1, further comprising an encoder (8), the encoder (8) being adapted to record the rotational position of the electrically excited slip ring.

5. The electrically excited slip ring according to claim 1, further comprising a hall sensor (9), the hall sensor (9) being adapted to record the rotational speed of the electrically excited slip ring.

6. An electrically excited slip ring as claimed in claim 3, characterized in that the tin-plated copper plate (22) has a thickness of 2mm.