KR20180049727A - Slip ring of alternator for vehicle and Alternator for vehicle containing the same - Google Patents

Abstract

The present invention relates to a slip ring of an alternating current generator for a vehicle and an alternating current generator for a vehicle including the same. According to the present invention, as a magnet is mounted on a slip ring of a rotor assembly, a separate process for assembling a target wheel is not additionally required as in a conventional configuration. According to one embodiment of the present invention, the slip ring of an alternating current generator for a vehicle is concentrically press-fit in a rotary shaft of the alternating current generator for a vehicle and comes into contact with a brush for supplying battery power to magnetize the rotor coil. The slip ring of an alternating current generator for a vehicle comprises: a cylindrical mold portion concentrically press-fitted in and fixated to one end of the rotary shaft and formed of a resin material, wherein a part of a lead wire on a power supply side and a part of a lead wire on a ground site that are electrically connected to the rotor coil are insert-molded; a first slip ring core installed on one side of the mold portion and electrically connected with the lead wire on the power supply side; a second slip ring core installed on the other side of the mold portion apart from the first slip ring core and electrically connected with the lead wire on the ground side; and the magnet disposed at an insulation section of the mold portion between the first slip ring core and the second slip ring core and having N poles and S poles alternately arranged at specific pitches.

Description

Technical Field [0001] The present invention relates to a slip ring of an automotive alternator and a vehicle alternator including the slip ring,

The present invention relates to a slip ring of an automotive alternator, and more particularly to a slip ring of a vehicle alternator, which is press-fitted into a rotary shaft of a vehicle AC generator and supplied with battery power for magnetizing a rotor coil from a brush, To a vehicle alternator.

BACKGROUND ART An automotive alternator is one of the electric components of an engine. The alternator is connected to an engine and a belt, converts alternating current generated through a stator assembly in an excited state of the rotor assembly into direct current through a rectifier, It charges the battery to the power supply and supplies the electric current necessary for operation with other electric parts.

1 is a cross-sectional view schematically showing an automotive alternator according to the prior art.

1, a conventional automotive alternator 100 includes a rotor assembly 120, a stator assembly 150, a regulator 110 and a rectifier assembly 140, A housing (not shown) for fixing and supporting these structures on the front and rear sides, and a pulley 130 receiving engine power.

The rotor assembly 120 includes a spool bobbin 122 mounted in the middle of a rotating shaft 121 that rotates, a field coil 124 wound around the spool bobbin 122, a spool bobbin 122 mounted on the rotating shaft 121, A pair of right and left rotor segments 126L and 126R surrounding the rotor 121 and a slip ring 128 mounted at one end of the rotation shaft 121 and electrically connected to the field coil 124 and the rotor segments 126L and 126R .

Here, the slip ring 128 is physically contacted with the brush 115 constituting the regulator 110, and the brush 115 supplies battery power to the slip ring 128. The battery power is supplied to the slip ring 128 via the brush 115 and applied to the field coil 124 so that the rotor segments 126L and 126R and the field coil 124 are electrically connected to the stator assembly 150 A magnetization state capable of acting becomes possible.

On the other hand, in the trend of universal application of ISG (Idle Stop & Go) function for fuel saving, it is necessary to construct an alternator in such a form that power generation as well as starter function can be demonstrated together to increase driving torque and reduce engine load There is a tendency to develop a generator. This is generally referred to as a belt-driven alternator starter (BAS).

Belt-driven alternator starter (BAS) is a structure in which the starter motor and alternator have a rotor and a stator structure, and the structure is very similar. The generator is operated depending on whether the power is applied or not. And it can be operated by a motor, which is advantageous in terms of space and cost.

In order to implement a general AC generator having the structure as shown in FIG. 1 as a belt-driven alternator star (BAS), it is necessary to sense the rotational position and the number of revolutions of the rotor assembly 120 described above. For this purpose, a rotor position detection means comprising a target wheel (magnetized magnet) and a Hall sensor (magnetic pole detection) is used.

2 is an exemplary view of a rotor assembly of a conventional alternator in which a rotor position detecting means including a target wheel (magnetized magnet) and a hall sensor (magnet magnetic pole detection) is additionally provided to add a starter function.

2, the rotor position detection means for applying the starter function includes a target wheel 160, which is a magnet magnetized on one side of a rotation shaft (rotor shaft) A Hall sensor 170 is disposed on an adjacent side of the target wheel 160 so that the Hall sensor 170 detects the magnetic force when the target wheel 160 rotates together with the rotation shaft 121.

However, in the case of such a structure, a separate process of assembling the target wheel to the rotating shaft (rotor shaft) is further required when assembling the rotor assembly. Therefore, the existing rotor assembly production line has to be enlarged or remodeled. In order to place the sensor around the target wheel, the radial space must be ensured and the device must be large.

Korean Unexamined Patent Publication No. 2010-0021214 (Publication date 2010.2.24)

SUMMARY OF THE INVENTION It is an object of the present invention to provide a magnetic bearing device in which a magnet is provided in a slip ring of a rotor assembly and a separate process for assembling a target wheel is not additionally required, (Hall sensor) is disposed in the slip ring of the automotive alternator, and it is unnecessary to secure an additional space for mounting the Hall sensor, and a vehicle alternator including the slip ring.

According to an aspect of the present invention as a means for solving the problems,

A slip ring of an AC generator which is pressed into a rotating shaft of a vehicle AC generator in a concentric structure and contacts a brush for supplying battery power for magnetizing the rotor coil,

A cylindrical mold part having a power supply side lead wire electrically connected to the rotor coil and a part of the ground side lead wire insert molded into the cylindrical part of the resin material,

A first slip ring core installed at one side of the mold part and electrically connected to the power supply side lead wire;

A second slip ring core provided on the other side of the mold part spaced apart from the first slip ring core and electrically connected to the ground side lead wire; And

And a magnet provided on the insulation section of the mold part between the first slip ring core and the second slip ring core and having N poles and S poles alternately arranged at a specific pitch. .

Here, the gap between the magnet and the first slip ring core, and between the second slip ring and the magnet may be electrically insulated by an insulating protrusion integrally formed with the mold.

The magnet may be a cylindrical dipole magnet having N and S poles alternately arranged at a pitch of 180 degrees with respect to a rotation center C of a rotary shaft to which the mold is press-fitted and fixed.

As another example, the magnet may be a cylindrical quadrupole magnet having N poles and S poles alternately formed at a pitch of 90 degrees with respect to the rotation center C of the rotation shaft to which the molded part is press-fitted and fixed.

Alternatively, the magnet may be a cylindrical six-pole magnet having an N pole and an S pole alternately formed at a pitch of 60 degrees with respect to a rotation center C of a rotary shaft to which the molded part is press-fitted and fixed.

In addition, the magnet may be installed in the insulation section of the mold part of the resin material through insert molding.

According to another aspect of the present invention as a means for solving the problems,

An automotive alternator, comprising:

A rotor assembly including a rotating shaft and a slip ring provided on the rotating shaft;

A stator assembly for generating an induced electromotive force through interaction with the rotor assembly;

A rectifier assembly for rectifying the alternating current output from the stator assembly into a direct current and outputting the direct current to the outside; And

And a regulator for controlling a magnetic field strength of the rotor assembly in association with the rectifier assembly, the brush having a brush contacting the slip ring,

The regulator includes:

And a brush holder having a ring-shaped rotary shaft mounting portion surrounding a part of a rotary shaft provided with the brush, a housing portion in which a part of the brush is elastically accommodated, and a slip ring,

And a magnetic sensor for detecting the rotational position of the rotary shaft for performing rotational motion is provided in the rotary shaft mounting opening.

At this time, a magnetic sensor may be installed on the inner main surface of the rotary shaft mount so as to face the magnet of the slip ring rotating together with the rotary shaft.

Preferably, one or more of the magnetic sensors may be spaced at an arbitrary interval in the circumferential direction on the inner circumferential surface of the rotary shaft mount.

According to the present invention, since the magnet is installed in the slip ring of the rotor assembly, there is an additional advantage that a separate process for assembling the target wheel is not required as in the conventional structure.

Further, by disposing a magnetic sensor (hole sensor) in the rotary shaft mounting hole of the brush holder corresponding to the position of the slip ring, it is not necessary to secure additional space for mounting the magnetic sensor.

1 is a cross-sectional view schematically showing an automotive alternator according to a prior art;
Figure 2 is an exemplary illustration of a rotor assembly of a conventional alternator with a starter function;
3 is a perspective view of a slip ring for an alternator according to an aspect of the present invention.
Fig. 4 is a side view of the slip ring shown in Fig. 3; Fig.
5 is a cross-sectional view of the slip ring shown in Fig.
FIG. 6 is a vertical cross-sectional view of the slip ring of FIG. 4 taken along the line AA, showing various embodiments showing the cut-out of the insulation section of the mold provided with the magnet;
7 is a cross-sectional view of a rotor assembly coupled with a regulator;
8 is a front view of the regulator shown in Fig.
Figure 9 shows another preferred embodiment of a rotor assembly.

Hereinafter, the terminology used in the specification is used only to describe a specific embodiment and is not intended to limit the present invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. It is to be understood that the terms "comprises", "having", and the like in the specification are intended to specify the presence of stated features, integers, steps, operations, elements, components, or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, parts, or combinations thereof.

Also, the terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

In addition, the terms " part, "" unit," " module, "and the like, which are described in the specification, refer to a unit for processing at least one function or operation, which may be implemented by hardware or software or a combination of hardware and software .

In the following description with reference to the accompanying drawings, the same reference numerals are given to the same constituent elements, and a duplicate description thereof will be omitted. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is a perspective view of a slip ring for an alternator according to an aspect of the present invention, and FIG. 4 is a side view of a slip ring shown in FIG. And Fig. 5 is a cross-sectional view of the slip ring shown in Fig.

3 to 5, a slip ring 30 according to an aspect of the present invention is inserted into a concentric structure on a rotary shaft (see FIG. 7) of an automotive alternator and is rotated in a direction from a brush (see FIG. 7) And a mold part 302 made of a plastic resin material which is press-fitted to the end of the rotating shaft and has insulation property.

The mold part 302 can be manufactured by injection molding or the like. Preferably, a hollow structure, for example, a cylindrical shape, which can be press-fitted in a concentric structure at one end of the rotary shaft, may be formed. The mold part 302 can be assembled by spline coupling to the outer diameter surface of one end of the rotating shaft so that the rotational force of the rotating shaft for rotational movement can be transmitted to the mold part 302 without loss.

A part of two lead wires for transferring battery power supplied through a brush to the rotor coil is inserted into the mold part 302. One is a power supply side lead wire 303a electrically connected to the power input shaft of the rotor coil (also referred to as a 'field coil'), and the other is a ground side lead wire 303b for drawing the power of the rotor coil to the outside )to be.

The two lead wires 303a and 303b may be insert-molded such that a part of each of the two lead wires 303a and 303b is in a different length inside the mold part 302 as shown in Fig. 5, The power supply side lead wire 303a is connected to the first slip ring core 304 to be described later and the ground side lead wire is connected to the second slip ring core 306. [

The first slip ring core 304 is installed on the outer surface of one side of the mold part 302. The first slip ring core 304 is an electrically conductive conductor and electrically connected to the power supply side lead wire 303a to electrically connect the power supply side brush (see FIG. 7) and the power supply side lead wire 303a It plays a role of electrically connecting.

The first slip ring core 304 may be provided in a coiled structure formed by winding a plurality of conductive coils on the outer surface of the mold part 302 or in the form of a hollow single conductor into which the mold part 302 can be inserted, The power supply side brushes are pressed against the outer surface of the first slip ring core 304 in an elastically pressurized manner to maintain an electrically close contact relationship.

Accordingly, even if the slip ring 30 rotates at a high speed with the rotation shaft, the battery power can be stably supplied to the first slip ring core 304 through the power supply side brush, The supplied battery power is applied to the rotor coil through the slip ring 30 to magnetize the rotor coil.

The second slip ring core 306 is electrically connected to the power supply side lead wire 303a and electrically connects the ground side brush (see FIG. 6) and the battery side lead wire 303b. This second slip ring core 306 may also be provided in the form of a single conductor of a coiled structure of the mold portion 302 or a hollow tube structure into which the mold portion 302 may be inserted.

The ground brush is elastically pressed against the outer surface of the second slip ring core 306 so that the electrical contact between the slip ring 30 and the slip ring 30 is maintained. The current of the rotor coil can be stably drawn out of the rotor assembly even if the rotor is rotated at a high speed.

A magnet 305 is installed in the insulation section S of the mold section 302 that electrically insulates the first slip ring core 304 and the second slip ring core 306 from each other. The magnet 305 is used to impart a starter function to the alternator. By configuring the rotor position detection means together with the magnetic sensor 505 as shown in Fig. 8, the rotation position and the rotation of the rotor assembly (see Fig. 7) And detects the number.

The magnet 305 can be formed into a cylindrical shape in which the N pole and the S pole are alternately formed at a specific pitch with respect to the circular arc direction. Since the magnet 305 is electrically conductive, it is absolutely required to have electrical insulation with the first slip ring core 304 and the second slip ring core 306. To this end, insulating protrusions 320a and 320b may be formed on the mold part 302 between the magnet 305 and the first slip ring core 304 and between the second slip ring core 306 and the magnet 305 .

In some cases, a bobbin (not shown) having an insulating ring formed at the front end and the rear end thereof is inserted into the cylindrical magnet 305, and the magnet 305 unit into which the bobbin is inserted is inserted into the first slip ring core 304 and the second The magnet 305 is electrically and electrically connected to the first slip ring core 304 and the second slip ring core 306 through the insulation ring of the bobbin by fitting the insulation sleeve S between the slip ring core 306 .

The magnet 305 may be integrally provided in the mold 302 by a method such as insert molding so that the surface (magnetic detection surface) is exposed to the outside. Of course, various methods can be considered. For example, there is a method of dividing a unit magnet cell into a plurality of unit magnet cells in the direction of a circular arc, and attaching the divided unit magnet cells to the outer surface portion of the insulation section S of the mold section 302 so as to be connected to each other.

FIG. 6 is a vertical cross-sectional view of the slip ring of FIG. 4 taken along the line A-A of FIG. 4, illustrating various embodiments showing the cut-out of the insulation section of the mold provided with the magnet.

6, a magnet 305 is a cylindrical two-pole magnet having an N pole and an S pole alternately formed at a pitch of 180 degrees with reference to a rotation center C of a rotation axis, (Fig. 6 (a)). 6 (b)) in which an N pole and an S pole are alternately formed at a pitch of 90 degrees with respect to a rotation center C, or a quadrupole magnet in which N pole and S pole are alternately formed at a pitch of 60 degrees (Fig. 6 (c)).

Of course, the present invention is not limited to the two poles, the four poles and the six poles, and the number of poles of the magnet 305 may be an even number (2n, where n is the number of poles).

The automotive alternator with the starter function including the slip ring having the above-described configuration will be described below.

The automotive alternator according to another aspect of the present invention is the same as the conventional automotive alternator illustrated in Fig. 1 (some of the stator assemblies and the rectifier assemblies). Therefore, a description of a part of the same structure as that of the conventional art, that is, a description of a known structure will be omitted, and only the technical features of the present invention, which are different from the conventional art, will be described below.

FIG. 7 is a cross-sectional view of a main part of the present invention showing a regulator coupled to a rotor assembly including a slip ring according to one aspect of the present invention, and FIG. 8 is a front view of the regulator shown in FIG.

7 and 8, the rotor assembly 3 includes a spool bobbin 32 mounted in the middle of a rotary shaft 31 that performs rotational motion, a rotor coil 34 wound around the spool bobbin 32, A pair of rotor segments 36L and 36R which are mounted on the rotary shaft 31 and surround the spool bobbin 32 wound with the rotor coil 34 and arranged symmetrically with respect to the center of the spool bobbin 32 ).

1) is connected to the crankshaft of the engine and a belt is connected to one end of the rotary shaft 31 of the rotor assembly 3 and an external battery (not shown) is connected to the other end thereof through the brushes 55a, 55b of the regulator 5, The above-described slip ring 30 is mounted to receive the power from the rotor coil 34 or to transfer the current from the rotor coil 34 to the outside.

The slip ring 30 receives power from the battery through the power supply side brush 55a of the regulator 5 and applies the power to the rotor segments 36L and 36R and the rotor coil 34 through the lead wire 303a . As a result, the rotor segments 36L and 36R and the rotor coil 34 are magnetized and rotated in this state, whereby an induced electromotive force is generated by interaction with the stator assembly (see FIG. 1).

The regulator 5 adjusts the output voltage by adjusting the magnetic field strength of the rotor assembly 3 in conjunction with the rectifier assembly (see FIG. 1). The regulator 5 is connected to the rectifier assembly (Not shown) in which an adjustment circuit is formed and a housing 50 for accommodating the same, and includes a brush 55a for supplying a regulated voltage to the slip ring 30.

The brushes 55a and 55b are resiliently mounted to the brush holder 52 on the side of the housing 50 so as to be urged in a direction in which the brushes 55a and 55b are tightly contacted to the slip ring 30 through a spring, The electric connection state between the slip ring 30 and the brush 55 can be stably maintained even if self-vibration or external impact is applied.

More specifically, the brush holder 52 includes a housing portion 53 in which a part of the brush 55 is elastically accommodated, a ring-shaped rotary shaft mounting portion 53 configured to surround a part of the rotary shaft 31 provided with the slip ring 30, And a magnetic sensor (not shown) for detecting the magnetic force of the magnet 305 attached to the slip ring 30 and detecting the rotational position of the rotor assembly 3, 505 are installed.

The magnetic sensor 505 may be installed on the inner circumferential surface of the rotary shaft mount 54 so as to face the magnet 305 of the slip ring 30 rotating together with the rotary shaft 31. Preferably, one or two or more spacers may be provided at an arbitrary interval in the circumferential direction on the inner main surface of the rotary shaft mount 54, so that it is not necessary to additionally provide a space for installing a separate magnetic sensor 505.

On the other hand, the magnet 305 is a magnetic body. The magnetic flux of the magnet 305 may adversely affect the rotor segments 36L and 36R and the rotor coils 34 magnetized by external power supply. 9, a shield plate 38 for a magnetic shield may be installed on the rotary shaft 31 between the slip ring 30 and the rotor segments 36L and 36R, have.

As described above, according to the present invention, since the magnet is installed in the slip ring of the rotor assembly, a separate process for assembling the target wheel can be omitted as in the conventional structure, By disposing the magnetic sensor in the mounting hole, it is unnecessary to secure a space for mounting the magnetic sensor, and the starter function can be added without increasing the size.

In the foregoing detailed description of the present invention, only specific embodiments thereof have been described. It is to be understood, however, that the invention is not to be limited to the specific forms thereof, which are to be considered as being limited to the specific embodiments, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims. .

3: Rotor assembly 5: Regulator
30: Slip ring 31:
32: spool bobbin 34: rotor coil
36L, 36R: rotor segment 38: shield plate
50: housing 52: brush holder
53: storage portion 54: rotating shaft mounting portion
55: brush 302:
303a: Power supply side lead wire
303b: ground side lead wire
304: first slip ring core 305: magnet
306: second slip ring core 505: magnetic sensor
320a, 320b: insulation protrusion S: insulation section

Claims (9)

A slip ring of an AC generator which is pressed into a rotating shaft of a vehicle AC generator in a concentric structure and contacts a brush for supplying battery power for magnetizing the rotor coil,
A cylindrical mold part having a power supply side lead wire electrically connected to the rotor coil and a part of the ground side lead wire insert molded into the cylindrical part of the resin material,
A first slip ring core installed at one side of the mold part and electrically connected to the power supply side lead wire;
A second slip ring core provided on the other side of the mold part spaced apart from the first slip ring core and electrically connected to the ground side lead wire; And
And a magnet provided on the insulation section of the mold part between the first slip ring core and the second slip ring core and having N poles and S poles alternately arranged at a specific pitch. .
The method according to claim 1,
Wherein the gap between the magnet and the first slip ring core and the gap between the second slip ring and the magnet are electrically insulated by an insulation protrusion integrally formed with the mold.
The method according to claim 1,
Wherein the magnet is a cylindrical dipole magnet having N-poles and S-poles alternately arranged at a pitch of 180 占 on the basis of a rotation center (C) of a rotary shaft to which the molded part is press-fitted and fixed.
The method according to claim 1,
Wherein the magnet is a cylindrical quadrupole magnet having N poles and S poles alternately arranged at an angle of 90 degrees with respect to a rotation center (C) of a rotary shaft to which the molded part is press-fitted and fixed.
The method according to claim 1,
Wherein the magnet is a cylindrical six-pole magnet having N poles and S poles alternately arranged at a pitch of 60 degrees with respect to a rotation center (C) of a rotation shaft to which the molded part is press-fitted and fixed.
The method according to claim 1,
Wherein the magnet is installed in an insulation section of the mold section by insert molding.
An automotive alternator, comprising:
A rotor assembly comprising: a rotary shaft; and a slip ring according to any one of claims 1 to 6 provided on the rotary shaft;
A stator assembly interacting with the rotor assembly to generate an induced electromotive force;
A rectifier assembly for rectifying the alternating current output from the stator assembly into a direct current and outputting the direct current to the outside; And
And a regulator for controlling a magnetic field strength of the rotor assembly in association with the rectifier assembly, the brush having a brush contacting the slip ring,
The regulator includes:
And a brush holder having a ring-shaped rotary shaft mounting portion surrounding a part of a rotary shaft provided with the brush, a housing portion in which a part of the brush is elastically accommodated, and a slip ring,
Wherein a magnetic sensor for detecting the rotational position of said rotary shaft for performing rotational motion is provided in said rotary shaft mounting opening.
8. The method of claim 7,
And a magnetic sensor is installed on an inner main surface of the rotary shaft mount so as to face the magnet of the slip ring rotating together with the rotary shaft.
9. The method of claim 8,
Wherein one or more of the magnetic sensors are spaced apart from each other at an arbitrary interval in a circumferential direction on an inner main surface of the rotary shaft mount.

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