KR102675874B1 - Wound rotor driving motor - Google Patents

Abstract

The present invention relates to a rotor assembly for a field-wound type drive motor that can increase the torque, efficiency, durability and lifespan of the motor, comprising: a rotor core rotatably disposed inside a stator; a rotating shaft that passes through one end and the other end of the rotor core and is coupled to the rotor core; and a field coil mounted on the rotating shaft and receiving current from the outside to rotate the rotor core.

Description

Rotor assembly for field wound drive motor {WOUND ROTOR DRIVING MOTOR}

The present invention relates to a rotor assembly for a field-wound type drive motor, and more specifically, to a rotor assembly for a field-wound type drive motor that can increase the torque, efficiency, durability, and lifespan of the motor.

In general, hybrid vehicles or electric vehicles, also called eco-friendly vehicles, are driven by an electric motor (hereinafter referred to as a “drive motor”) that obtains rotational force from electrical energy.

Among these, hybrid vehicles drive in EV (Electric Vehicle) mode, a pure electric vehicle mode that uses only the power of the drive motor, or in HEV (Hybrid Electric Vehicle) mode, which uses the rotational power of both the engine and drive motor as power.

And, electric vehicles run using the rotational force of the drive motor as power.

As such, most drive motors used as power sources for eco-friendly vehicles use permanent magnet synchronous motors (PMSM).

These permanent magnet synchronous motors need to maximize the performance of the permanent magnets in order to achieve maximum performance under limited layout conditions.

Here, neodymium (Nd) in the permanent magnet improves the strength of the permanent magnet, and dysprosium (Dy) improves high temperature demagnetization resistance.

However, these rare earth metals (Nd, Dy) for permanent magnets are limited in some countries, such as China, and are very expensive and subject to significant price fluctuations.

To improve this, the application of induction motors has recently been considered, but there are excessive restrictions on the amount of increase in size, such as volume and weight, to achieve the same motor performance.

Meanwhile, in the industry, development of field wound type (WRSM) drive motors to replace permanent magnet synchronous motors (PMSM) as drive motors used as power sources for eco-friendly vehicles is progressing further.

In this type of field-wound drive motor, when electricity is applied by bringing the brush into surface contact with the slip ring, which is the rotor, the direction of the current flowing in the field coil flows in the opposite direction, forming a strong magnetic field, and the rotor moves in the magnetic field pole. It is an electric device that rotates at high speed.

In addition, the brushes of the field-wound type drive motor are always in surface contact with the slip ring rotating at high speed, and as the slip ring rotates, they are gradually worn and their function deteriorates. For this purpose, the housing of the field-wound type drive motor is used. Brush replacement work is required by disassembling and checking whether the brushes have been replaced.

However, in a field-wound drive motor, in order to check the wear condition of the brushes, the motor housing must first be disassembled and then the brushes must be replaced. However, the operator fails to check the wear condition of the brushes at an appropriate time, resulting in excessive wear of the brushes. If this happens, there is a problem that damage to the motor and equipment accidents, such as damage to the slip ring or disconnection of the field coil, occur.

In addition, the conventional field-wound drive motor generates noise, vibration, and wear due to mechanical contact friction between the rotating slip ring and the fixed brush, which reduces the torque, efficiency, durability, and lifespan of the motor. there was.

Registered Patent Publication 10-0326166 (2002. 02. 15.) Registered Patent Publication 10-0339467 (2022.05.22.)

The present invention aims to solve the above-described problems, and its purpose is to provide a rotor assembly for a field-wound type drive motor that can increase the torque, efficiency, durability, and lifespan of the motor.

A rotor assembly for a field-wound drive motor according to an embodiment of the present invention includes a rotor core rotatably disposed inside a stator; a rotating shaft that passes through one end and the other end of the rotor core and is coupled to the rotor core; and a field coil mounted on the rotating shaft and receiving current from the outside to rotate the rotor core.

The rotor core includes a hollow cylindrical core body portion; A first end portion whose other surface is in contact with one surface of the core body portion; and a second end portion disposed parallel to and spaced apart from the first end portion and having one surface in contact with the other surface of the core body portion.

The core body portion includes a plurality of first crowpoles spaced apart from each other along the circumference of the other surface of the first end portion and extending in the other direction; A plurality of second crowpoles are spaced apart from each other along the circumference of one surface of the second end portion, extend in one direction, and are inserted between the plurality of first crowpoles.

The field coils are made up of a pair and are disposed on one side of the first end portion and the other side of the second end portion, respectively.

The field coil includes a first coil disposed inside the core body portion; and a second coil formed as a pair and disposed on one surface of the first end portion and the other surface of the second end portion, respectively.

A through hole through which the rotation axis passes is formed in the first end portion and the second end portion, respectively, and an insertion groove in which a peripheral portion of the through hole is recessed from the outer surface to the inner surface is formed.

The field coils are composed of a pair, and each pair of field coils is inserted into the insertion groove.

A rotation prevention member is disposed between the pair of field coils and the rotation shaft.

In the rotor assembly for a field-wound drive motor according to the present invention, a rotation prevention member is disposed between the field coil and the rotation shaft, so that even when the rotation shaft rotates, the field coil is arranged in a stationary state by the rotation prevention member, It has the effect of allowing current to be applied stably.

In addition, the field coil is placed outside the core body and receives current from the outside without mechanical contact friction, thereby preventing noise, vibration, and wear, and increasing the torque efficiency, durability, and lifespan of the motor. .

In addition, by disposing the first coil inside the rotor body and disposing a pair of second coils on one side and the other side of the core body, it is possible to additionally generate field magnetic flux, which results in the back electromotive force and It has the effect of increasing the torque of the motor.

1 is a perspective view showing a rotor assembly for a field-wound type drive motor according to an embodiment of the present invention.
Figure 2 is an exploded perspective view showing the disassembled state of the rotor assembly for a field winding type drive motor according to an embodiment of the present invention.
Figure 3 is a cross-sectional view taken along line A-A' shown in Figure 1.
Figure 4 is a perspective view showing a core body portion according to another embodiment of the present invention.
Figure 5 is a cross-sectional view showing a cross-section of a rotor assembly for a field-wound type motor according to another embodiment of the present invention.

The advantages and features of the present invention and methods for achieving them will become clear by referring to the embodiments described in detail below along with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and will be implemented in various different forms. The present embodiments only serve to ensure that the disclosure of the present invention is complete and that common knowledge in the technical field to which the present invention pertains is not limited. It is provided to fully inform those who have the scope of the invention, and the invention is defined by the claims. Meanwhile, the terms used in this specification are for describing embodiments and are not intended to limit the present invention. As used herein, singular forms also include plural forms, unless specifically stated otherwise in the context. As used in the specification, “comprises” or “comprising” means the presence or presence of one or more other components, steps, operations and/or elements other than the mentioned elements, steps, operations and/or elements. Addition is not ruled out.

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

Figure 1 is a perspective view showing a rotor assembly for a field-wound type drive motor according to an embodiment of the present invention, and Figure 2 is an exploded state of the rotor assembly for a field-wound type drive motor according to an embodiment of the present invention. It is an exploded perspective view, and Figure 3 is a cross-sectional view showing a cross section cut along A-A' shown in Figure 1, Figure 4 is a perspective view showing the core body portion according to another embodiment of the present invention, and Figure 5 is a cross-sectional view showing the core body portion of the present invention. This is a cross-sectional view showing a cross-section of a rotor assembly for a field-wound motor according to another embodiment.

1 to 5, a rotor assembly for a field wound type motor according to an embodiment of the present invention includes a rotor core 100, a rotating shaft 200, and a field coil 300.

The rotor core 100 is spaced apart from the inner surface of the stator and is rotatably disposed. When a current is applied from the outside, it is electromagnetized and a driving torque is generated by the electromagnetic attraction and repulsion of the rotor core 100 and the stator core. do.

This rotor core 100 includes a core body portion 130, a first end portion 110, and a second end portion 120.

The core body portion 130 may preferably be made of a first crowpole (131: CLAW POLE) and a second crowpole (132).
The first crowpole 131 is one in which the N pole is magnetized. A plurality of the first crowpole 131 are spaced apart from each other along the circumference of the other side of the first end portion 110 and extend in the other direction, and the second crowpole 132 is S The poles are magnetized, and a plurality of them are spaced apart from each other along the circumference of one surface of the second end portion 120 and extend in one direction.
And, the second crowpole 132 is shaped to be inserted between the first crowpoles 131 that are spaced apart from each other.

In addition, the first end portion 110 has its other surface in contact with one surface of the core body portion 130, and the second end portion 120 is arranged in parallel and spaced apart from the first end portion 110 and has one surface of the core body portion 130. It touches the other side of (130).

Because of this, the rotor core 100 can seal the interior of the core body portion 130.

And, a through hole 111 through which the rotation shaft 200 passes is formed in the first end portion 110 and the second end portion 120.

That is, the rotation shaft 200 penetrates the through hole 111 of the first end portion 110 and the through hole 111 of the second end portion 120, and the rotation shaft 200 is rotatably coupled.

Additionally, an insertion groove 112 is formed around the through hole 111.

The insertion groove 112 is formed around the through hole 111 of the first end 110 and the second end 120, and is formed in the outer surface direction of the first end 110 and the second end 120. It is formed by collapsing inward from the inside.

A field coil 300, which will be described later, is inserted into this insertion groove 112.

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The rotating shaft 200 is coupled to the rotor core 100 by passing through one end and the other end of the rotor core 100, and more specifically, the through hole 111 of the first end portion 110 and the second end portion. It passes through the through hole 111 of the unit 120 and is rotatably coupled to the rotor core 100.

One end and the other end of this rotating shaft 200 protrude from one side and the other side of the rotor core 100.

As described above, the field coil 300 is mounted on one end and the other end of the rotating shaft 200, the one end and the other end of which protrude from one and other surfaces of the rotor core 100.

The field coil 300 is mounted on the rotating shaft 200 and receives current from the outside to rotate the rotor core 100. It consists of a pair and is mounted on one end and the other end of the rotating shaft 200, respectively.

More specifically, when the field coil 300 receives a current from the outside as described above, the magnetic field generated from the field coil 300 connects the first crowpole 131 with the N pole magnetized and the first crowpole 131 with the S pole magnetized. 2 Rotational force is generated in the rotor core 100 by interaction with the grow pole 132.
Here, the current applied to the field coil 300 is the field current (FIELD CURRENT).
These field coils 300 are made up of a pair and are disposed on one side of the first end portion 110 and the other side of the second end portion 120, respectively, and an insertion groove 112 formed on one side of the first end portion 110. ) and the insertion groove 112 formed on the other side of the second end portion 120, respectively.

That is, unlike the conventional field coil 300 of the present invention, which is disposed inside the rotor core 100, the field coil 300 of the present invention is located outside the rotor core 100, that is, on one side and the other side of the rotor core 100, as described above. are placed respectively.

Additionally, a rotation prevention member 210 is disposed between the field coil 300 and the rotation shaft 200.

The rotation prevention member 210 prevents the field coil 300 from rotating along the rotation shaft 200 when the rotation shaft 200 rotates, and includes a bearing made of a non-magnetic material that is not affected by the operation of the drive motor, and It is desirable that it has the same structure.

For this reason, the field coil 300 is disposed in a stationary state on the rotation shaft 200 by the rotation prevention member 210 even if the rotation shaft 200 rotates, so that current can be stably applied from the outside.

Therefore, the field coil 300 is disposed on the outside of the core body 130, so that a free space is formed inside the core body 130, and the field coil 300 can be connected to the rotor core by changing the shape of the rotor core. (100) It is possible to move or insert from the outer side to the inner side.

In addition, the present invention eliminates conventional slip rings and brushes that reduce the torque efficiency of the motor by generating noise, vibration, and wear due to mutual mechanical contact friction, thereby increasing the torque efficiency, durability, and lifespan of the motor.

Meanwhile, the field coil 300 according to another embodiment of the present invention may be composed of a first coil 310 and a second coil 320, as shown in FIG. 5.

The first coil 310 is disposed inside the core body portion 130.

In addition, the second coil 320 is made up of a pair and is disposed on one side of the first end portion 110 and the other side of the second end portion 120, respectively, and an insertion groove formed on one side of the first end portion 110. It is inserted into the insertion groove 112 formed on the other surface of 112 and the second end portion 120, respectively.

For this reason, if the field coil 300 according to another embodiment of the present invention cannot increase the number of turns of the field coil 300 or the diameter of the field coil 300 according to the specifications of the rotor core 100, the core Like the structure of the conventional rotor core 100 in which the field coil 300 is disposed inside the body 130, the first coil 310 is disposed inside the core body 130 of the present invention, and the core By arranging a pair of second coils 320 on one side and the other side of the body portion 130, additional field magnetic flux can be generated, thereby increasing the back electromotive force of the driving motor and the torque of the motor.

As described above, the rotor assembly for a field-wound drive motor according to the present invention has a rotation prevention member 210 disposed between the field coil 300 and the rotation shaft 200, so that it rotates even when the rotation shaft 200 rotates. Since the field coil 300 is placed in a stopped state by the prevention member 210, current can be stably applied from the outside.

In addition, the field coil 300 is disposed on the outside of the core body 130 to receive current from the outside without mechanical contact friction, thereby preventing noise, vibration, and wear, and improving the torque efficiency, durability, and lifespan of the motor. It can be raised.

In addition, by arranging the first coil 310 inside the rotor body and a pair of second coils 320 on one side and the other side of the core body 130, it is possible to generate additional field magnetic flux. This can increase the back electromotive force of the drive motor and the torque of the motor.

The present invention is not limited to the above-described embodiments, and can be implemented with various modifications within the scope permitted by the technical idea of the present invention.

100: rotor core 110: first end portion
111: Through hole 112: Insertion groove
120: second end portion 130: core body portion
131: 1st crowpole 132: 2nd crowpole
200: Rotation shaft 210: Rotation prevention member
300: field coil 310: first coil
320: second coil

Claims (8)

a rotor core rotatably disposed inside the stator;
a rotating shaft that passes through one end and the other end of the rotor core and is coupled to the rotor core; and
It includes a field coil mounted on the rotating shaft and receiving current from the outside to rotate the rotor core,
The rotor core is,
core body;
A first end portion whose other surface is in contact with one surface of the core body portion; and
It includes a second end portion disposed parallel to and spaced apart from the first end portion and having one surface in contact with the other surface of the core body portion,
The core body part,
A plurality of first crowpoles are spaced apart from each other along the circumference of the other surface of the first end portion and extend in the other direction;
A plurality of second crowpoles are spaced apart from each other along the circumference of one surface of the second end portion and extend in one direction, and are inserted between the plurality of first crowpoles,
The field coil is,
It consists of a pair and is disposed on one side of the first end portion and the other side of the second end portion, respectively.
Rotor assembly for field wound drive motor.
delete delete delete The method of claim 1, wherein the field coil is:
A first coil disposed inside the core body portion; and
A second coil made up of a pair and disposed on one side of the first end portion and the other side of the second end portion, respectively.
Rotor assembly for field wound drive motor.
The method of claim 1, wherein the first end portion and the second end portion,
Through holes through which the rotation axis passes are formed, and insertion grooves are formed in the peripheral portions of the through holes recessed from the outer surface to the inner surface.
Rotor assembly for field wound drive motor.
According to clause 6,
The field coil consists of a pair,
In the insertion groove, a pair of the field coils are each inserted.
Rotor assembly for field wound drive motor.
The method of claim 7, wherein a rotation prevention member is disposed between the pair of field coils and the rotation axis.
Rotor assembly for field wound drive motor.

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