KR101353625B1 - Motor - Google Patents

Abstract

A motor according to one embodiment of the present invention includes: a motor housing; a stator which is installed in the motor housing and includes a stator core and a coil wound around the stator coil; a rotor which is rotationally installed in the center of the stator; a plate module which includes a plurality of stacked plates, is combined with the upper sides of the rotor and the stator, and supplies power to the coil; and a terminal which is installed in the plate module and supplies power with different polarities to the plates.

Description

Motor {MOTOR}

The present invention relates to a brushless motor.

In general, a steering device assisted by a separate power is used as a device to ensure the stability of steering of the vehicle. Conventionally, such an auxiliary steering device is used as a device using hydraulic pressure, but recently, an electric power steering system (Electronic Power Steering System) having low power loss and high accuracy is used.

The electric steering device (EPS) as described above drives the motor in an electronic control unit (ECU) according to the driving conditions sensed by the vehicle speed sensor, torque angle sensor, torque sensor, etc. to ensure turning stability and provide fast resilience. This allows the driver to drive safely.

In this EPS system, the motor assists the driver to operate the steering wheel for steering, so that the steering operation can be performed with less force. The motor uses a BLDC motor.

In general, the BLDC motor is coupled to the housing and the cover member to form an exterior of the motor, and a stator is provided on an inner circumferential surface of the housing, and the center of the stator is rotatable according to electromagnetic interaction with the stator. A rotor to be installed is provided. The rotor is rotatably supported by a rotating shaft, and a steering shaft of the vehicle is connected to an upper portion of the rotating shaft to provide power to assist steering as described above. The stator of the EPS motor configured as described above is supplied with power to the coil wound through the bus bar.

The stator is composed of a core and coils wound around the core. In general, a motor used in a vehicle connects a plurality of coils in parallel to reduce losses caused by coil resistance. Therefore, in the case of parallel connection, a method in which the coil is extended to the input / output terminals and the terminals are collectively connected is used. Busbars are coupled to the upper side of the stator to collectively connect the coils arranged in parallel as described above. In order to couple the busbars, the coil terminals of the respective coils of coils are disposed on the upper side of the stator. A busbar is connected to the coil terminal.

A plurality of metal members electrically connected to the coil terminal are fixedly disposed while being insulated by an insulator. The busbar has a substantially donut shape to correspond to the top surface of the stator. Terminals for connecting to the coil terminal are arranged on the outer circumferential surface of the bus bar.

The shape of the busbar depends on the power source to which the busbar is connected. In general, the EPS motor is disposed through a three-phase circuit, and respective input / output terminals are sequentially disposed on the outer circumferential surface of the busbar.

However, when the coil is connected using the bus bar in this way, there is a difficulty in connecting the coil to the bus bar, and the height of the EPS motor is increased by the height of the bus bar, thus making it difficult to miniaturize the motor.

In addition, in order to manufacture a bus bar, a complicated process such as forming a bus terminal, molding a bus bar body with an insulator, and the like, requires a complicated process, which requires excessive processing time.

It is an object of the present invention to provide a brushless motor having an improved structure to improve motor miniaturization and assembly.

The motor according to an embodiment of the present invention includes a motor housing; A stator installed inside the motor housing and including a stator core and a coil wound around the stator core; A rotor rotatably installed at the center of the stator; A plurality of plates stacked on the plate module coupled to the stator and the upper side of the rotor to supply power to the coil; And a terminal installed inside the plate module to supply power having different polarities to the plurality of plates.

The plate module may include first to fourth plates having the same diameter as each other.

The terminal may include first to fourth terminal forming holes integrally formed in each of the first to fourth plates; And first to fourth terminals formed in the first to fourth terminal forming holes.

The first terminal may be connected to ground, and the second to fourth terminals may be connected to a power supply of U, V, and W three phases, respectively.

The first plate may include first through third coil through holes having a first diameter; And a first terminal through hole having a second diameter smaller than the first diameter. In this case, the number of the first terminal through holes may be equal to the sum of the numbers of the first to third coil through holes.

The second plate has a fourth coil through hole having a first diameter; And a second terminal through hole having a second diameter smaller than the first diameter.

The third plate may include a fifth coil through hole having a first diameter; And a third terminal through hole having a second diameter smaller than the first diameter.

The fourth plate has a sixth coil through hole having a first diameter; And a fourth terminal through hole having a second diameter smaller than the first diameter.

In this case, the second diameter may correspond to the diameter of the coil, and the first to fourth plates may include at least 4 oz (Oz.) Or more of copper.

The plate module may include an insulating layer disposed on an external exposed surface.

Instead of the busbar of the complicated structure used previously, a plurality of plate members can be stacked to connect each polarity and common terminal of the power supply, thereby providing a smaller motor by lowering the height of the motor.

1 is a partial cutaway cross-sectional view of a motor according to an embodiment of the present invention;
2 is a plan view of a plate module according to an embodiment of the present invention;
3 is a plan view of the first plate of FIG. 2, and
4 to 6 are plan views of the second to fourth plates of FIG. 2.

Hereinafter, a motor according to an embodiment of the present invention will be described with reference to the attached drawings.

1 is a partial cutaway cross-sectional view of a motor according to an embodiment of the present invention, FIG. 2 is a plan view of a plate module according to an embodiment of the present invention, FIG. 3 is a plan view of the first plate of FIG. 2, and FIGS. 4 to 4. FIG. 6 is a plan view of the second to fourth plates of FIG. 2.

As shown in FIG. 1, the EPS motor according to the present invention includes a motor housing 10, a stator 20, and a rotor 30, and supplies power to a coil 22 wound on the stator 20. The first to fourth plates 110 to 140 may include a stacked plate module 100.

The motor housing 10 is provided in a substantially cylindrical shape, forms an opening in the upper side, and the lower side is closed. Inside the motor housing 10, the stator 20, the rotor 30, and a rotation shaft 30a rotatably supporting the rotor 30 are installed.

The stator 20 includes a stator core 21, a coil 22, and a coil terminal 25 configured to peel off the end of the coil. The stator core 21 may be provided with a plurality of teeth so that the coil 22 may be wound around the teeth under an insulator. An end of the coil 22 may be peeled off to form the coil terminal 25. The coil terminal 25 is provided in a cylindrical shape having a predetermined diameter and length.

The rotor 30 is rotatably installed in the center of the stator 20, and a plurality of magnets are mounted on an outer circumferential surface of the rotor core. The rotating shaft 30a is installed coaxially with the rotor 30, and one end of the rotating shaft 30 is rotatably supported by a lower bearing installed on the bottom surface of the motor housing 10, and the other end thereof is installed on a cover member not shown. Supported by bearings.

The sensing unit 34 includes a plate 31, a sensing magnet 32, and a magnetic element 33. The plate 31 is provided in a substantially disk shape, and the sensing magnet 32 is fixed to the upper side using an adhesive or the like. The sensing magnet 32 may be provided in a shape having a through-hole in the center.

The magnetic element 33 detects a change in the magnetic field of the sensing magnet 32 and is installed to face the sensing magnet 32. The magnetic element 33 may be installed on the bottom surface of the plate module 100 disposed above the rotor 30.

2 to 6, the plate module 100, a plurality of first to fourth plates (110 to 140) having the same outer shape is laminated and bonded, the coating or resin coating on the exposed surface An insulating layer 160 may be formed. In this case, the first to fourth plates 110 to 140 have a disk shape, and a through hole is formed in the center, and the diameter of the through hole may be formed to correspond to at least the diameter of the rotation shaft 30a.

As shown in FIG. 3, the first plate 110 serves as a common terminal, and a plurality of through holes may be formed on the outer circumferential surface as shown. In this case, the through hole may include a first coil through hole 111 having a first diameter, a second coil through hole 112, a third coil through hole 113, and a second diameter having a second diameter smaller than the first diameter. One terminal through-hole 115 may be provided. In this case, the first to third coil through holes 111 to 113 and the first terminal through holes 115 may be alternately arranged as shown. That is, the first terminal through hole 115 is disposed after the first coil through hole 111, and the second coil through hole 112 is next to the first coil through hole 115, and the first terminal through hole 115 is next to the first coil through hole 111. The three coil through holes 113 may be arranged in the order of the first terminal through holes 115. The reason for such an arrangement configuration will be described later. In addition, a substantially rectangular first terminal forming hole 110a may be formed in the first plate 110, and a first terminal 151 may be formed in the first terminal forming hole 110a. Can be. The first terminal 151 may be connected to the ground such that the first plate 110 may be a neutral connection layer.

As shown in FIG. 4, the second plate 120 may have a disk shape having the same outer circumferential surface and inner circumferential surface as the first plate 110 as described above. The second plate 120 has a fourth coil through hole 121 having a diameter corresponding to the first diameter and a second terminal through hole having a second diameter corresponding to the first terminal through hole 115 ( 122). In addition, a substantially rectangular second terminal hole 120a may be formed in the second plate 120, and a second terminal 152 may be formed in the second terminal hole 120a. Can be. The second terminal 152 may be connected to a W phase power source so that the second plate 120 may be a W phase layer.

As shown in FIG. 5, the third plate 130 may have a disk shape having the same outer circumferential surface and inner circumferential surface as the first plate 110 as described above. The third plate 130 has a fifth coil through hole 131 having a diameter corresponding to the first diameter and a third terminal through hole having a second diameter corresponding to the first terminal through hole 115 ( 132). In addition, the third terminal forming hole 130a having a substantially rectangular shape may be formed in the third plate 130, and the third terminal 153 may be formed in the third terminal forming hole 130a. Can be. The third terminal 153 may be connected to a V phase power so that the third plate 130 may be a V phase layer.

As illustrated in FIG. 6, the fourth plate 140 may have a disk shape having the same outer circumferential surface and inner circumferential surface as the first plate 110 as described above. The fourth plate 140 has a sixth coil through hole 141 having a diameter corresponding to the first diameter and a fourth terminal through hole having a second diameter corresponding to the first terminal through hole 115 ( 142). In addition, the fourth terminal forming hole 140a may be formed in the fourth plate 140, and the fourth terminal 154 may be formed in the fourth terminal forming hole 140a. Can be. The fourth terminal 154 may be connected to a U phase power so that the fourth plate 140 may be a U phase layer.

Meanwhile, the first to fourth terminal through holes 115, 122, 132, and 142 may be formed of a conductive material, and the second diameter may correspond to the diameter of the coil 22. . In this case, the inner peripheral surfaces of the first through fourth terminal through holes 115, 122, 132, and 142 are subjected to solder coating, and the like, when heat is applied using a tool such as a hot gun. The coils 22 passing through the first through fourth terminal through holes 115, 122, 132, and 142 may be electrically connected to each other.

In addition, the first to fourth plates 110, 120, 130, and 140 are commonly disposed so as to conduct electricity with the first through fourth terminal through holes 115, 122, 132, and 142. The conductive layer may be configured on the surface or the inside thereof. When the conductive layer is disposed on the upper side or the lower side, the conductive layer may be coated or coated with an insulating paint or the like to prevent an external short. When formed in, the member surrounding the conductive layer may be formed of an insulating member. On the other hand, the conductive layer is the weight of the conductive member used rather than the thickness or area is important, according to an embodiment of the present invention, the conductive member is a copper material and may be provided with a weight of at least 4 oz (oz.) Or more. . At this time, the diameter and thickness of the plate module 100 may be increased or decreased corresponding to the diameter of the motor. If the weight of the copper, which is the conductive member, can be maintained only 4 ounces or more, the thickness may be freely adjusted. The thickness of the plates 110 to 140 may be configured not to exceed 1 mm at maximum. In general, when the plate module 100 using 4 ounces of copper is formed in the shape of a disk, since the etching process required for general PCB formation is omitted, the manufacturing cost is low.

On the other hand, the plate module 100 is configured as described above is laminated coupled, it is necessary to laminate the respective through holes to a specific arrangement position. That is, the first plate 110 composed of a common terminal is disposed at the bottom. In addition, a second plate 120 connected to a power source having a first polarity may be stacked on the upper side of the first plate 110, and the second terminal through hole 122 of the second plate 120 may be stacked. The first coil through hole 111 may be disposed to correspond to the first coil through hole 111. In the same manner, the third terminal through hole 132 of the third plate 130 is disposed at a position corresponding to the second coil through hole 112 and the fourth terminal through hole 142 of the fourth plate 140. May be disposed at a position corresponding to the third coil through hole 113. On the other hand, the first to third polarity may be provided in the W, V, U phase, the arrangement order of these may be freely changed according to the design.

Meanwhile, as shown in FIG. 2, when the first to fourth plates 110 to 140 are stacked, the first to fourth terminals 151 to 154 may be disposed not to overlap each other. According to such a configuration, the first to fourth terminals 151 to 154 may be connected without being shorted to powers having different polarities. Meanwhile, in the above embodiment, the shape of the first to fourth terminals 151 to 154 is illustrated by way of a ring shape, but the present invention is not limited thereto, and the product may be configured with various types of terminals as necessary. Do.

According to the present invention as described above, by removing the existing bus bar, and performs the same function as the bus bar by combining the plate module 100 of the first to fourth plates (110 to 140) having the same external shape as a disk shape. It is possible to improve the assembly and productivity.

On the other hand, the embodiment of the present invention described as a case where the three-phase power is applied as an example, when the polarity of the applied power is more or less, the number of plates constituting the plate module 100 is It may increase or decrease.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. Accordingly, the true scope of the present invention should be determined by the following claims.

10; Motor housing 20; The stator
21; Stator core 22; coil
30; Rotor 31; Rotating shaft
100; Plate module 110; First plate
111-113; First to third coil through holes
115; A first terminal through hole 120; Second plate
121; Fourth coil through hole 122; 2nd terminal through hole
130; Third plate 131; 5th coil through hole
132; Third terminal through hole 140; Fourth plate
141; Sixth coil through hole 142; 4th terminal through hole

Claims (12)

Motor housing;
A stator installed inside the motor housing and including a stator core and a coil wound around the stator core;
A rotor rotatably installed at the center of the stator;
A plate module including a plurality of plates stacked on the stator and the rotor, the plate modules including first to fourth plates having the same diameter to supply power to the coil; And
A terminal installed inside the plate module to supply power of different polarities to the plurality of plates;
The first plate,
First to third coil through holes disposed in a position proximate to an outer circumferential surface of the coil to penetrate the coil, and having a first diameter larger than a diameter of the coil; And
A second diameter smaller than the first diameter, disposed between the first and second coil through holes, between the second and third coil through holes, and between the third and first through holes, and formed of an electrically conductive material. And a first terminal through hole electrically connected to the coil passing through the internal space. delete The method of claim 1, wherein the terminal,
First to fourth terminal forming holes integrally formed in each of the first to fourth plates; And
And first to fourth terminals formed in the first to fourth terminal forming holes. The method of claim 3, wherein
The first terminal is grounded,
The second to fourth terminals are connected to a power source of U, V, W three phases, respectively. delete The method of claim 1,
And the number of the first terminal through holes is equal to the sum of the number of the first to third coil through holes. The method of claim 1, wherein the second plate,
A fourth coil through hole having the first diameter and through which the coil passes; And
The second diameter has a second diameter, a total of three are arranged alternately between the same number of the fourth coil through-holes so as not to face the first terminal through-holes, it is formed of a conductive material capable of energizing the coil passing through the inside And a second terminal through-hole connected to each other. The method of claim 7, wherein the third plate,
A fifth coil through hole having a first diameter and through which the coil passes; And
The coil having the second diameter and a total of three coils alternately disposed between the same number of the fifth coil through-holes so as not to face the first and second terminal through-holes, and formed of a conductive material And a third terminal through hole electrically connected to the third terminal. The method of claim 8, wherein the fourth plate,
A sixth coil through hole through which the coil having a first diameter passes; And
The coils having the second diameter and are alternately disposed between the same number of the sixth coil through-holes so that a total of three do not face the first to third terminal through-holes, and are formed of a conductive material and pass through the inside. And a fourth terminal through hole electrically connected to the fourth terminal. The method according to any one of claims 3, 4 and 6 to 9,
The second diameter is formed to be equal to the size of the diameter of the coil. The method of claim 1,
Wherein the first to fourth plates comprise at least 4 ounces (Oz.) Or more of copper. The method of claim 1, wherein the plate module,
A motor comprising an insulating layer disposed on an external exposed surface.

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