KR20000016740U - Rotor bobbin of alternator for car - Google Patents

Abstract

The present invention relates to a rotor bobbin of an automotive alternator, the purpose of which is to facilitate the alignment winding work by improving the outer peripheral surface of the bobbin in which the winding of the field coil starts.

The rotor bobbin 34 of the automotive alternator according to the present invention is installed by being fitted inside a pair of field cores 31 forming the rotor 30 by winding the field coil 33 receiving the field current several times. A spiral tab 343 is formed over the entire surface in the screw direction to guide the winding operation to the outer circumferential surface of the body 341 of the bobbin 34 where the winding of the coil 33 starts.

Therefore, the initial winding of the field coil 33 is performed along the valley 344 of the spiral tab 343, so that the winding of the field coil 33 is easily performed, and the winding height of the field coil 33 is increased. As it is lowered, the short phenomenon with the field core (31) is prevented there is an advantage that the overall product reliability is improved.

Description

Rotor bobbin of alternator for car

The present invention relates to an automotive alternator, and more particularly, to a bobbin of a rotor in which a field coil is wound and fitted inside a field core.

In general, a vehicle alternator induces a voltage while rotating by the power of an engine, the structure of which is as shown in FIG.

As shown in the related art, a conventional automotive alternator is composed of a pair of field cores (4a) inside a pair of front and rear brackets (1, 2) having an exhaust body configured as a front and rear, and having an exhaust body through which air is sucked and exhausted. The electron 4 is embedded, and the stator 3 is provided to surround the rotor 4.

The stator 3 is installed in the inner circumference of the front and rear brackets 1 and 2 so as to maintain a constant distance from the rotor 4, in which coils are formed to interact with each other to generate electromotive force when the rotor 4 rotates. It is wound.

The rotor 4 is fitted with the bobbin 4e wound around the field coil 4b inside the field core 4a, and the rotary shaft 4c is press-fitted to penetrate the center of the field core 4a in the axial direction. . One end of the rotating shaft 4c extending through the center of the front bracket 1 to the outside is equipped with a pulley 4d connected via an engine (not shown) and a belt (not shown). On the center of 1) and the rear bracket 2, bearings 6a and 6b rotatably supporting both ends of the rotating shaft 4c are provided.

The other end of the rotating shaft 4c is maintained in contact with the tip of the brush 7a of the brush device 7 to supply current to the field coil 4b. To this end, the other end of the rotating shaft (4c) is provided with a slip ring fixing member (5c) is provided on the outer circumferential surface of the F-polar slip ring (5a) and L polar slip ring (5b) spaced at regular intervals, F polar slip ring (5a) ) And the L-polar slip ring 5b are connected to each end of the field coil 4b through the lead wire 5d.

The two brushes 7a are elastically supported by the springs 7c in the brush holder 7b so that the front end portions are always in contact with the slip rings 5a and 5b, whereby the brushes 7a and slip rings ( The voltage regulating device 8 and the field coil 4b form a closed circuit through the 5a and 5b and the lead wire 5d. Further, around the other end of the rotating shaft 4c, electrical components such as a voltage regulator 8 for controlling the field current flowing through the field coil 4b and the output of the generator, and a rectifier 9 for converting alternating current into direct current are installed. It is.

In the alternator configured as described above, the pulley 4d is rotated together with the engine driving so that the rotation shaft 4c and the rotor 4 interlock with each other. At this time, the F-polar slip ring 5a and the L-polar slip ring 5b are rotated while rubbing the tip of the brush 7a, so that the field current is supplied through the brush 7a and the lead wire 5d. Magnetic force is generated in the field coil 4b of the rotor 4. Accordingly, in the coil of the stator 3, the induced electromotive force, that is, the output current, is generated by interacting with the magnetomotive force. The output current is then supplied to each part of the vehicle via the rectifier 9.

However, the field coil 4b for forming magnetic force by receiving the field current of the conventional alternator is installed inside the pair of field cores 4a while being wound on the bobbin 4e, and has a flat bobbin 4e. By winding in the), there is a problem that the alignment winding work is difficult and its productivity is lowered.

That is, since the outer circumferential surface of the center of the bobbin 4e at which the winding of the field coil 4b starts is flat as shown in FIG. 2, the winding start part is slippery, and thus the field coil 4b is not correctly aligned initially. The spacing between neighboring field coils 4b becomes uneven. In some cases, a portion in which the winding height of the field coil 4b is increased after the winding is completed is formed, which causes a short with the field core 4a, resulting in a breakdown voltage.

The present invention is to solve this problem, the object of the present invention is to install a bobbin wound around the field coil to be supplied with a field current is inserted into the inside of a pair of field cores, the winding on the outer peripheral surface of the bobbin field coil winding starts It is to provide a rotor bobbin of an automotive alternator to facilitate the alignment winding of the field coil by forming a spiral tab in the screw direction to guide the alignment winding during operation.

1 is a cross-sectional view showing the overall structure of a conventional alternator.

Figure 2 is a cross-sectional view showing the main portion of the conventional winding structure of the field coil wound on the bobbin.

3 is a cross-sectional view showing the overall structure of the vehicle AC generator according to the present invention.

4 is a perspective view of a bobbin according to the present invention.

Figure 5 is a cross-sectional view of the main part showing the structure of the field coil wound on the bobbin according to the present invention.

* Description of the symbols for the main parts of the drawings *

30. Rotor 31. Field magnet

33. Field coil 34. Bobbin

341 Body 342 Guide part

343. Helix tab 344 Goal

The present invention for achieving the above object is a vehicle having a bobbin in which a field coil is wound several times so as to be installed inside a pair of field cores in which an axis of rotation is press-fitted in the axial direction, and field magnetized by receiving a field current. In the rotor of the alternator,

On the outer circumferential surface of the bobbin is characterized in that the spiral tab formed in the screw thread direction is provided on the outer circumferential surface to guide the field coil end is aligned winding along the valley at the start of winding the field coil.

Hereinafter, one preferred embodiment according to the present invention will be described in detail with reference to the accompanying drawings. 3 is a cross-sectional view showing the overall structure of the vehicle alternator according to the present invention, Figures 4 and 5 are a cross-sectional view of the bobbin and the field coil wound bobbin according to the present invention.

The alternator for a vehicle to which the present invention is applied, as shown in these, forms the outer body and has a stator 20 and a rotor 30 installed inside the front bracket 10 and the rear bracket 11 in which exhaust ports are formed. Electrical components are attached to the outside of the bracket 11. The front bracket 10 and the rear bracket 11 are bound to face each other through bolts to surround the stator 20 and the rotor 30 and are directly fastened to the engine room of the vehicle.

The stator 20 is firmly fixed to the inner circumferences of the front and rear brackets 10 and 11 so as to maintain a constant distance from the rotor 30, and generates an induced electromotive force by interacting with the magnetic force generated from the rotor 30. The coil to make is wound.

The rotor 30 is largely divided into a pair of field cores 31 in which the field coils 33 are wound, and a rotating shaft 32 that is press-fitted in the axial direction thereof.

Both ends of the rotating shaft 32 are supported at the center of the front and rear brackets 10 and 11 so that the rotational movement is smooth. For this, the front bearing 35 is provided at the center of the front bracket 10 and the rear bracket 11 is provided. The rear bearing 36 is comprised in the center part. Pulleys (PULLY, 37) are coupled to the front end of the rotating shaft 32 extending outside the front bracket 10, and is connected to the engine driving shaft (not shown) via a belt (not shown). In addition, the other end of the rotating shaft 32 extending to the outside of the rear bracket 11 has a slip ring 40 connected to the field coil 33 of the rotor 30 through the lead wire 41. Around the other end of the rotary shaft 33, a brush device 50 having a built-in brush 51 to maintain contact with the rectifier 70 and the slip ring 40, which converts alternating current, which is an electrical functional component of the generator, into direct current. ), A voltage adjusting device 60 for controlling the field current supplied to the field coil 33 and the output voltage of the generator through the brush 51 is installed, and they are wrapped through the end cover 12 to protect from the outside. do.

In addition, the field coil 33 is installed inside the pair of field cores 31 in a state of being pre-wound in the bobbin 34, and the structure thereof will be described in more detail as follows.

First, the bobbin 34 is injection-molded with an insulating resin and has a hollow cylindrical body 341 and outwardly flanged portions at both side ends thereof so that the center of the field core 31 is fitted and coupled to the field coil 33. It is composed of a guide portion 342 to prevent the departure from the outside as well as to prevent the short phenomenon with the field core (31).

The outer circumferential surface of the bobbin 34 body 341 is a portion in which the actual field coil 33 is wound. Here, the spiral tab 343 is formed in the sawtooth shape, that is, in the thread direction. The distance D1 between the valley 344 and the valley 344 of the spiral tab 343 is preferably 0.9 mm, and the depth D2 of the valley 344 is 0.5 mm, which is along the valley 344. In the process of winding the field coil 33, a portion of the field coil 33 is exposed to the outside so that the next winding part is easily seated between neighboring field coils 33.

Therefore, when the winding of the field coil 33 starts, the field coil 33 is wound on the outer circumferential surface of the bobbin 34 body 341 along the spiral tab 343, and the field coil 33 is wound along the valley 344 and wound. Work does not slip and alignment winding is easy.

That is, the winding is correctly made by guiding the valley 344 of the spiral tap 343 to be wound on the winding of the field coil 33. In addition, as the field coil 33 is wound up in alignment, a short phenomenon between the field coil 33 and the field core 31 is prevented, thereby preventing a pressure withstand defect. In addition, it is possible to reduce the overall space for winding the field coil 33, and to improve the output performance by applying to the free space to improve the magnetic circuit (increased magnetic saturation).

Next will be described the operation and effect of the vehicle alternator according to the present invention configured as described above.

First, when the vehicle engine is started, the rotating shaft 32 and the rotor 30 are rotated at high speed together with the pulley 37 connected through a belt (not shown), and at the same time, the brush (at the other end of the rotating shaft 32) 51) the front end portion continuously rubs against the outer circumferential surface of the slip ring 40. Accordingly, the field coil 33 is supplied with the field current from the voltage adjusting device 60 through the brush 51 and the slip ring 40, and the magnetic force is generated, and the induced electromotive force is generated in the coil wound around the stator 20. do. This output current is converted into a direct current through the rectifier 70 and supplied to each electric device of the vehicle.

The field coil 33 of the alternator having such a function is wound around the spiral tab 343 of the bobbin 34 according to the present invention, so that the winding height is lowered and uniformly formed, and the short phenomenon with the field core 31 is achieved. As described above, if the free space generated by the reduction of the winding height is used as a space for improving the magnetic circuit, the output performance of the AC generator can be improved.

As described in detail above, the rotor bobbin of the automotive alternator according to the present invention is installed by inserting a field coil supplied with a field current several times inside a pair of field cores forming a rotor, and the winding of the field coil starts. Spiral tabs are formed over the entire surface in the screw direction to guide the winding operation on the outer peripheral surface of the central bobbin.

Therefore, the initial winding work of the field coil is carried out along the valley of the spiral tap, and the winding of the field coil is made easy, and the winding height of the field coil is reduced, and the short phenomenon with the field core is prevented as the winding height of the field coil is lowered. There is an advantage that the reliability is improved.

Claims (1)

A bobbin in which a field coil 33 is wound several times so that a rotating shaft 32 is inserted into the field core 31 in the axial direction and fitted inside the field core 31 and receives a field current to form a magnetic force. In the rotor of the automotive alternator provided with (34), On the outer circumferential surface of the bobbin 34 is formed a spiral tab 343 connected in a threaded direction on the outer circumferential surface so that the end of the field coil 33 is guided in alignment winding along the valley 344 at the start of winding the field coil 33. Rotor bobbin of the automotive alternator characterized in that it is.