KR101963710B1 - Brush assembly of field winding type motor and field winding type motor having the same - Google Patents

Abstract

The present invention relates to a brush assembly of a field winding motor. The brush assembly of a field winding motor according to an embodiment of the present invention includes a brush and a slip ring electrically connected to the brush in contact therewith, and the brush and the slip ring are disposed inside the brush to cool the heat generated in the brush. A holder to be accommodated; And a brush guide portion disposed in the holder, one side of which is in contact with the brush, and the other side of which is exposed to the outside of the holder to cool or release heat generated from the brush to the outside of the holder.

Description

BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to a brush assembly for a field winding motor and a field winding motor including the same,

BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to a brush assembly of a field winding motor and a field winding motor including the brush assembly.

Hybrid vehicles or electric vehicles, which are referred to as environmentally friendly vehicles, are driven by electric motors that obtain rotational power by electrical energy.

More specifically, a general electric vehicle is driven by using the rotational power of an electric motor as a power source. The hybrid electric vehicle is driven in an EV (Electric Vehicle) mode using only the power of the electric motor, And travels in HEV (Hybrid Electric Vehicle) mode.

As such an electric motor used as a power source of an environmentally friendly automobile, development of a WRSM (Wound Rotor Synchronous Motor) motor is actively under way.

Conventional field winding motors can generate magnetic flux in the rotor by applying a current through a brush made of carbon and a slip ring to electrically connect the electric current to the coil wound on the rotor of the motor through the brush.

At this time, when electric current is applied to the brush, frictional heat is generated between the brush and the slip ring due to the brush resistance. Such a phenomenon occurs that the brush is fixed to the slip ring due to overheating of the brush. Becomes unstable, and other parts may be damaged.

In addition, it is difficult to attach a measuring device for directly measuring the temperature of the brush due to vibration, and the temperature of the brush can be estimated by measuring the temperature of the holder. However, the holder is a plastic material having low thermal conductivity, There was a problem that the response was slow.

A brush assembly of a field winding motor capable of cooling the heat generated from the brush and measuring the temperature of the brush in real time and preventing direct contact between the brush and the holder to prevent deformation of the holder, To provide a field-wound linear motor.

According to an aspect of the present invention, there is provided a brush holder comprising: a holder including a brush and a slip ring electrically connected to the brush, the brush and the slip ring being housed therein to cool the heat generated in the brush; And a brush guide portion disposed in the holder and having one side abutting the brush and the other side exposed to the outside of the holder to cool the heat generated in the brush or to discharge the heat to the outside of the holder, to provide.

Here, the brush guide unit may include a guide member that can be moved by inserting the brush therein, and a heat emitting member that is connected to the guide member at one side and the other side is exposed to the outside of the holder.

At this time, the guide member may be formed so as to correspond to the brush so that the brush can be moved in the inserted state.

In this case, a connection member connected to the other side of the heat releasing member, and a plate member connected to one side of the connection member and discharging heat generated from the brush may be included.

At this time, the connecting member and the plate member may be formed of a material having a high thermal conductivity.

At this time, at least two of the heat emitting member, the connecting member, and the plate member may be integrally formed.

At this time, a pin member may be formed on at least one surface of the plate member.

At this time, the plate member may be formed in a plate shape, and at least one discharge groove or a discharge hole may be formed in the plate member.

At this time, a temperature sensor capable of measuring the temperature of the brush may be provided at one side of the brush guide unit.

At this time, a support spring may be disposed between the brush and the holder to increase the contact force between the brush and the slip ring by pressing the brush.

According to another aspect of the present invention, there is provided a motor comprising: a motor housing; A rotating shaft formed at a center portion of the motor housing; A motor installed in the motor housing and rotatable around the rotation shaft, and a brush assembly of the motor described above, which is installed on the rotation shaft perpendicularly to the direction of extension of the rotation shaft, on one side of the motor housing, to provide.

The brush assembly of the field winding motor according to the embodiment of the present invention includes a brush guide portion to prevent direct contact between the brush and the holder to prevent the holder from being deformed due to heat generated in the brush, Can be prevented.

Further, the brush assembly of the field winding motor according to the embodiment of the present invention electrically connects the brush and the slip ring due to the elastic force of the support spring even when the brush is worn, thereby stably supplying the driving current to the coil of the motor .

The field winding type motor including the brush assembly of the field winding motor according to an embodiment of the present invention includes a brush assembly to cool the heat generated in the brush to prevent breakage of other components, A magnetic flux can be generated in the rotor by applying a current to the coil wound on the rotor of the motor through the brush.

The brush assembly of the field winding motor according to the embodiment of the present invention can measure the temperature of the brush at any time by providing a temperature sensor on the brush guide portion so that the brush can respond quickly when the brush is overheated.

1 is a cross-sectional view of a field winding type motor provided with a brush assembly of a field winding motor according to an embodiment of the present invention.
2 is a cross-sectional view illustrating a brush assembly of a field winding motor according to an embodiment of the present invention.
FIG. 3 (a) is a perspective view showing a holder, a brush and a brush guide in a brush assembly of a field winding motor according to an embodiment of the present invention, and FIG. 3 (b) is a sectional view of FIG.
Fig. 4 (a) is a perspective view showing that a connecting member and a plate member are provided in the brush guide portion of Fig. 3 (a), and Fig. 4 (b) is a sectional view of Fig.
Fig. 5 (a) is a perspective view showing that a pin member is provided in the brush guide portion of Fig. 4 (a), and Fig. 5 (b) is a sectional view of Fig.
Fig. 6 (a) is a perspective view showing a plurality of brush guide portions of Fig. 5 (a), and Fig. 6 (b) is a sectional view of Fig.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

In this specification, the terms "comprises" or "having" and the like refer to 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, components, parts, or combinations thereof.

1 is a cross-sectional view of a field winding type motor provided with a brush assembly of a field winding motor according to an embodiment of the present invention. 2 is a cross-sectional view illustrating a brush assembly of a field winding motor according to an embodiment of the present invention.

1 and 2, a field winding motor 1 including a brush assembly 50 of a field winding motor according to an embodiment of the present invention includes a motor housing 10, a rotor 20, And a brush assembly (hereinafter referred to as " brush assembly ") 50 of a field winding motor.

1, the rotary shaft 30 side of the motor is defined forward in the brush 200 and the brush 200 side is defined rearward in the rotary shaft 30. The rotor 20 , The brush assembly 50 will be described upward and the brush assembly 50 will be described with the rotor 20 side downward.

Referring to FIG. 1, in an embodiment of the present invention, a rotor 20 may be installed inside a motor housing 10 so as to be rotatable about a rotary shaft 30. At this time, the brush assembly 50 may be installed on the upper side of the motor housing 10.

The field winding motor 1 is provided with the brush assembly 50 to cool the heat generated in the brush 200 to prevent breakage of other components and to electrically connect the brush and the slip ring 100 A magnetic flux can be generated in the rotor by applying a current to the coil wound around the rotor 20 of the motor through the brush.

2, a brush assembly 50 according to an embodiment of the present invention includes a holder 300, a brush 200, a support spring 400, a slip lining 100, and a brush guide portion 600).

Accordingly, the brush assembly 50 according to an embodiment of the present invention can cool the heat generated in the brush 200 and prevent direct contact between the brush and the holder 300, thereby preventing deformation of the holder, The temperature of the brush can be measured to quickly take action if the temperature of the brush is at a dangerous temperature.

Meanwhile, in an embodiment of the present invention, the holder 300 may be positioned on the top of the motor housing 10 and may be formed in a rectangular cross section, but the present invention is not limited thereto. A hollow portion (not shown) may be formed in the holder 300 so that the brush 200, the slip ring 100, the support spring 400, and the brush guide portion 600 are disposed. At this time, a heat emitting member 620 to be described later may be disposed outside the holder 300.

The slip ring 100 may be provided on the rotary shaft 30 of the motor in front of the holder 300 and may be provided on the rotor 20 in order to apply a current to a coil And may include a first slip ring 100 and a second slip ring 120, which are a pair of current transmission media.

2, the first slip ring 110 and the second slip ring 120 are installed so as to surround one end of the rotation shaft 30 of the motor, and more specifically, And can be press-fitted and fixed to the outer circumferential surface of the rotary shaft in a mutually spaced relationship.

The first slip ring 110 and the second slip ring 120 are connected to the (+) and (-) poles of the coil wound on the rotor 20 and the rotation of the rotating shaft 30 As shown in FIG.

Meanwhile, in an embodiment of the present invention, the brush 200 may be disposed between the slip ring 100 and the support spring 400 in the holder 300. At this time, the brush 200 is pressed by the support springs 400, thereby enhancing the contact force with which the brush 200 contacts the slip ring 100. Also, as shown in FIG. 2, in an embodiment of the present invention, the brush 200 may be formed in a bar shape as a rectangular cross section, but is not limited thereto.

Referring to FIG. 2, the brush 200 may include a pair of first brushes 210 and a second brush 220. Referring to FIG. 2, the first brush 210 and the second brush 220 may be spaced apart from each other in the holder 300. The first brush 210 and the second brush 220 are disposed so that the ends of the first brush 210 and the second brush 220 contact the outer circumferential surfaces of the first slip ring 110 and the second slip ring 120, .

Meanwhile, in one embodiment of the present invention, the support spring 400 may be formed of a coil spring or a leaf spring, which is made of a non-conductive material. The support spring 400 may be disposed between the brush 200 and the holder 300 to increase the contact force between the brush and the slip ring 100 by pressing the rear end of the brush.

Accordingly, even if the brush 200 is worn, the brush assembly 50 according to an embodiment of the present invention can easily electrically connect the brush to the slip ring 100 due to the elastic force of the support spring 400.

The power source unit 500 may include a first power source terminal 510 and a second power source terminal 520 and may be connected to the rear side of the brush 200. [ In this case, the first power terminal 510 may be a positive terminal and the second power terminal 520 may be a negative terminal.

The first power terminal 510 and the second power terminal 520 may be connected to the brush 200 through the holder 300. Thus, a DC (DC) driving current for driving the field winding type motor 1 can be supplied to the windings of the motor.

That is, the brush 200 and the slip ring 100 are in contact with each other, so that the driving current supplied to the brush 200 can be supplied to the windings of the motor via the slip ring. At this time, the driving current is supplied to the winding wound around the rotor of the field winding motor 1, and the driving current is applied to the winding to generate the N pole and the S pole, whereby the electromotive force can be adjusted according to the magnitude of the current applied.

Meanwhile, in an embodiment of the present invention, the brush guide unit 600 may include a guide member 610 and a heat emitting member 620. The brush guide unit 600 may be formed such that one side thereof is in contact with the brush 200 and the other side thereof is exposed to the outside of the holder 300.

At this time, in one embodiment of the present invention, the brush guide part 600 may be made of metal or aluminum, but it is not limited to a material having a high heat conductivity and a material having a high heat resistant temperature.

Accordingly, the brush assembly 50 according to an embodiment of the present invention includes the brush guide unit 600 to receive the heat generated from the brush 200 and discharge the heat to the outside of the holder 300. Also, the brush guide unit 600 directly contacts the brush 200 to prevent the holder 300 from contacting the brush, thereby preventing the holder from being deformed due to heat generated in the brush.

Referring to FIG. 2, the guide member 610 may be inserted into a first insertion hole 310 formed on one side of the holder 300, for example, on both sides of the holder 300. At this time, the guide member 610 may be formed to correspond to the shape of the brush 200 so that the guide member 610 can move in a state where the brush 200 is inserted therein.

FIG. 3 (a) is a perspective view showing a holder, a brush and a brush guide in a brush assembly of a field winding motor according to an embodiment of the present invention, and FIG. 3 (b) is a sectional view of FIG.

Referring to FIG. 3, the guide member 610 may have a hollow portion (not shown) to allow the brush 200 to be inserted therein, and may be formed in a cylindrical shape having a rectangular or circular cross section. .

Accordingly, the brush assembly 50 according to an embodiment of the present invention is provided with the brushes 200, It is possible to prevent direct contact with the holder 300 and to prevent the holder 300 from being deformed due to heat generated in the brush.

Meanwhile, the guide member 610 may extend along the longitudinal direction of the brush 200. The guide members 610 may be formed in multiple numbers and the plurality of guide members 610 may be disposed on the inner surface of the holder 300 along the longitudinal direction of the holder.

Referring to FIG. 3, the guide member 610 may be connected to a heat emitting member 620 formed to be exposed to the outside of the holder 300 in an embodiment of the present invention. Accordingly, the brush assembly 50 according to an embodiment of the present invention discharges the heat generated from the brush 200 to the outside of the holder 300 The temperature of the brush can be lowered, thereby preventing breakage of other parts.

3, the heat-radiating member 620 may be installed on both sides of the holder 300, but may be installed on the upper side or the lower side of the holder 300, But it is not limited thereto as long as it can be discharged to the outside.

The heat releasing member 620 may have a plate shape or a bar shape and one end may be connected to the guide member 610 and the other end may be exposed to the outside of the holder 300. Specifically, May be inserted into the second insertion holes 320 formed on both sides of the holder 300 and exposed to the outside of the holder. At this time, the second insertion hole 320 may communicate with the first insertion hole 310.

Fig. 4 (a) is a perspective view showing that a connecting member and a plate member are provided in the brush guide portion of Fig. 3 (a), and Fig. 4 (b) is a sectional view of Fig.

In an embodiment of the present invention, the connecting member 622 and the plate member 624 may be connected to the heat discharging member 620 in the brush guide unit 600. At this time, the plate member 624 may be formed in a plate shape to widen the heat emitting area as shown in Figs. 4 (a) and 4 (b), but is not limited thereto.

The connection member 622 extends outwardly from the heat emitting member 620 and has one end connected to the heat emitting member 620 and the other end connected to the plate member 624, The heat of the heat-emitting member 620 may be transmitted to the plate member 624.

In this case, the connecting member 622 may be formed of a material having a high thermal conductivity, so that the heat generated in the brush 200 may be discharged to the outside of the holder 300 through the connecting member. The connecting member 622 may be formed integrally with the plate member 624 in the form of a plate or a bar.

Fig. 5 (a) is a perspective view showing that a pin member is provided in the brush guide portion of Fig. 4 (a), and Fig. 5 (b) is a sectional view of Fig. Fig. 6 (a) is a perspective view showing a plurality of brush guide portions of Fig. 5 (a), and Fig. 6 (b) is a sectional view of Fig.

5 (a) and 5 (b), the brush guide portion 600b may be formed with a pin member 626 on one side of the plate member 624 in an embodiment of the present invention. Accordingly, the brush assembly 50 according to an embodiment of the present invention can effectively discharge the heat generated from the brush 200 to the outside of the holder 300.

In an embodiment of the present invention, a discharge hole (not shown) or a discharge groove (not shown) may be formed in the plate member 624. The heat dissipating area of the heat discharging member 620 is increased to efficiently discharge the heat generated in the brush 200 to the outside of the holder 300.

A temperature sensor (not shown) for measuring the temperature of the brush 200 in real time may be provided on one side of the connecting member 622 or on one side of the heat emitting member 620. Accordingly, when the brush 200 is overheated to a temperature higher than a proper temperature by further movement or vibration, measures can be taken so that the temperature of the brush is no longer increased.

In this case, the operation of the field winding motor 1 according to the embodiment of the present invention may be temporarily stopped or the brush guide unit 600 may be cooled to positively lower the temperature of the brush 200. However, Anything that can lower the temperature may be possible.

6 (a) and 6 (b), a plurality of plate members 624 and a pin member 626 may be formed in the brush guide portion 600b in an embodiment of the present invention. Accordingly, the brush assembly 50 according to an embodiment of the present invention can more efficiently discharge the heat generated from the brush 200 to the outside of the holder 300.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, 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.

1: Field winding motor 10: Motor housing
20: Rotor 30: Rotation axis of the motor
50: brush assembly of field winding motor
100: slip ring 110: first slip ring
120: second slip ring 200: brush
210: first brush 220: second brush
300: holder 310: first insertion hole
320: second insertion hole 400: support spring
500: Power supply unit 510: First power supply terminal
520: second power terminal 600: brush guide part
610: guide member 620: heat releasing member
622: connecting member 624: plate member
626: pin member

Claims (11)

A brush assembly for a field winding motor, comprising a brush and a slip ring in electrical contact with the brush to cool the heat generated by the brush
A holder in which the brush and the slip ring are received,
And a brush guide portion disposed in the holder and having one side abutting the brush and the other side exposed to the outside of the holder to cool or release heat generated from the brush to the outside of the holder,
The brush guide portion
A guide member which can be moved by inserting the brush into the guide member and
And a heat releasing member having one side connected to the guide member and the other side exposed to the outside of the holder. delete The method according to claim 1,
Wherein the guide member is formed so as to correspond to the brush so that the brush can be moved while being inserted into the brush. The method according to claim 1,
A connecting member connected to the other side of the heat emitting member,
And a plate member connected to one side of the connecting member to discharge heat generated from the brush. delete 5. The method of claim 4,
Wherein at least two of the heat releasing member, the connecting member, and the plate member are integrally formed. 5. The method of claim 4,
And a pin member is formed on at least one surface of the plate member. 5. The method of claim 4,
Wherein the plate member is formed in a plate shape and at least one discharge groove or discharge hole is formed in the plate member. The method according to claim 1,
And a temperature sensor capable of measuring the temperature of the brush at one side of the brush guide part. The method according to claim 1,
And a support spring located between the brush and the holder to increase a contact force between the brush and the slip ring by pressing the brush. Motor housing;
A rotating shaft formed at a center portion of the motor housing;
A rotor rotatably installed in the motor housing around the rotation shaft, and
The motor of the field winding motor according to any one of claims 1, 3, 4, 6 to 10, which is installed on one side of the motor housing on the rotation axis perpendicular to the direction of extension of the rotation shaft Field winding motor comprising an assembly.

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