KR20130017224A - Eps motor - Google Patents

Abstract

PURPOSE: An EPS(Electronic Power Steering System) motor is provided to offer a minimized EPS motor by lowering the height of a motor as much as the height of a bus bar by replacing the bus bar with a power layer of a printed circuit board. CONSTITUTION: A rotor is rotatably arranged on the center of a stator. A sensing magnet module is disposed on the upper side of the rotor and senses the position of the rotor. A magnetic cell(150) is disposed facing the sensing magnet module for detecting magnetic force of the sensing magnet module. A multilayer printed circuit board(200) comprises a sensor layer(210) on which the magnetic cell is mounted, and a power layer. The power layer comprises a first power layer(221), a second power layer(222), and a third power layer(223).

Description

EPS motor {EPS MOTOR}

The present invention relates to an EPS motor without a bus bar.

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.

SUMMARY OF THE INVENTION An object of the present invention is to provide an EPS motor having an improved structure to reduce the height of the motor by eliminating the bus bar so that the product can be miniaturized.

Still another object of the present invention is to provide an EPS motor having an improved structure to eliminate bus bars and improve the configuration of an existing printed circuit board, thereby reducing the number of parts and reducing material costs.

EPS motor according to the present invention, the motor housing; A stator installed inside the motor housing and including a stator core, a coil wound around the stator core, and a coil terminal coupled to an end of the coil; A rotor rotatably installed at the center of the stator; A sensing magnet module installed above the rotor to sense a position of the rotor; A magnetic element disposed to face the sensing magnet module to sense a magnetic force of the sensing magnet module; And a multilayer printed circuit board including a sensor layer on which the magnetic element is mounted and a plurality of power layers connected to powers of different polarities supplied to the coils, respectively.

When the plurality of power layers are connected to the three-phase power source, the plurality of power layers may be provided as first to third power layers.

To this end, the multilayer printed circuit board preferably covers the entire upper side of the motor housing.

The multilayer printed circuit board may include a terminal hole through which the coil terminal is coupled through, and the terminal hole may be electrically connected to one of the first to third power layers.

According to a preferred embodiment of the present invention, 18 terminal holes are formed through the circumferential surface of the multilayer printed circuit board, and are connected to other terminal holes and different power layers adjacent to each other, and are coupled to the terminal holes. It is preferable that the coil terminals receive power of different polarity from the coil terminals coupled to other terminal holes in the vicinity.

According to the present invention as described above, instead of the bus bar, since a plurality of bus layers are formed on a conventional printed circuit board installed for the rotor position, the height of the motor can be lowered by the height of the bus bar, miniaturized EPS It is possible to provide a motor.

In addition, since the bus bar is replaced by the power layer of the printed circuit board, it is possible to reduce the material cost by reducing the number of parts.

1 is a plan view of an EPS motor according to an embodiment of the present invention,
FIG. 2 is a side cross-sectional view of a portion of FIG. 1;
3 is an enlarged side cross-sectional view of a portion of the printed circuit board of FIG. 2.

Hereinafter, an EPS motor according to a preferred embodiment of the present invention will be described with reference to the drawings. 1 is a plan view of an EPS motor according to the present invention, FIG. 2 is a sectional view taken along line A-A of FIG. 1, and FIG. 3 is an enlarged view of portion A of FIG.

1 and 2, the EPS motor according to the present invention includes a motor housing 100, a stator 110, a rotor 120, a rotation shaft 130, a sensing magnet module 140, and a magnetic element 150. And a multilayer printed circuit board 200.

The motor housing 100 is provided in a substantially cylindrical shape, forms an opening in the upper side, and the lower side is closed. The stator 110, the rotor 120, and the rotation shafts 130 rotatably supporting the rotor 120 are installed in the motor housing 100.

The stator 110 includes a stator core 111, a coil 112, and a coil terminal 113. The stator core 111 is configured such that the coil 112 can be wound along a circumferential surface, and an end of the coil 112 is electrically connected to the coil terminal 113. In this case, the coil terminal 113 is provided in a cylindrical shape having a predetermined diameter and length, as shown in FIG.

The rotor 120 is rotatably installed in the center of the stator 110, and a plurality of magnets are mounted on the outer circumferential surface of the rotor core.

Rotating shaft 130 is installed coaxially with the rotor 120, one end is rotatably supported by a lower bearing 131 installed on the bottom surface of the housing 100, the other end of the cover member is not shown It is supported by the upper bearing installed.

The sensing magnet module 140 includes a plate 141 and a sensing magnet 142. The plate 141 is provided in a substantially disk shape, and the sensing magnet 142 is fixed to the upper side using an adhesive or the like. The sensing magnet 142 is preferably provided in a donut shape having a hole in the center.

The magnetic element 150 detects a change in the magnetic field of the sensing magnet 142 and is installed to face the sensing magnet 142.

The multilayer printed circuit board 200 is disposed above the rotor 120 and the sensing magnet module 140, and preferably closes the entire upper opening of the motor housing 100 as shown in FIG. 1. In order to be able to do so, it is preferable to provide a large disk shape.

The multilayer printed circuit board 200 may include a plurality of power layers 220 to which a sensor layer 210 on which the magnetic element 150 is mounted, and different polarities of power supplied to the coil 112 are connected. It includes.

According to a preferred embodiment of the present invention, as shown in Figure 2, the plurality of power supply layer 220, when connected to a three-phase power supply, is provided with first to third power supply layers (221 ~ 223) It is preferable.

In addition, the multilayer printed circuit board 200 may include a terminal hole 201 through which the coil terminal is coupled through, and the terminal hole 201 may include a coil terminal that is electrically connected to the coil 112. 113 is through-coupled. The terminal hole 201 which is electrically connected to the coil terminal 113 may be electrically connected to one of the first to third power layers 221 to 223. According to an exemplary embodiment of the present invention, the terminal hole 201 may be formed through 18 along the circumferential surface of the multilayer printed circuit board 200, but the present invention is not limited thereto. And can be increased or decreased depending on the dose.

For example, suppose that the U phase power is applied to the first power supply layer 221, the V phase power is applied to the second power supply layer 222, and the W phase power is applied to the third power supply layer 223. When the first terminal hole 201a on the multilayer printed circuit board 200 is electrically connected to the first power source layer 221, the first terminal hole 201a is connected to the second and third power source layers 222. 223 is insulated from. In addition, the second terminal hole 201b adjacent to the first terminal hole 201a is insulated from the first and third power source layers 221 and 223, and is capable of energizing the second power source layer 222. The third terminal hole 201c is insulated from the first and second power supply layers 221 and 222, and is electrically connected to the third power supply layer 223. Therefore, according to the position of the inserted terminal hole 201, the coil terminal 113 penetratingly coupled to the terminal hole 201 may apply power having different polarities to the coil 112.

In addition, a power terminal 202 is provided on the outermost surface of the multilayer printed circuit board 200 so as to be electrically connected to the first to third power layers 221 to 223, respectively. 202 is connected to a power terminal 205 to which an external power source is connected.

According to the present invention as described above, the first to third power supply layers (221 to 223) of the multilayer printed circuit board 200, the base is composed of an insulator such as a resin material, only the portion that needs to be energized The pattern is formed of the same conductive material. Therefore, when the power supply pattern is formed at the position of the terminal hole 201 requiring power supply for each polarity in each of the first to third power supply layers 221 to 223 without performing a molding molding process for forming an insulator. Therefore, it is possible to supply power having different polarities to the coil 112 cheaply and simply compared to the conventional busbar manufacturing. In addition, since the power layer 220 may be stacked together with the sensor layer 210 to form a single multilayer printed circuit board 200, it is possible to manufacture an EPS motor with a relatively thin thickness.

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.

100; Motor housing 110; The stator
111; Stator core 112; coil
120; Rotor 130; Rotating shaft
131; Bearing 140; Sensing Magnet Module
141; Plate 142; Sensing magnet
150; Magnetic element 200; Multi Layer Printed Circuit Board
210; Sensor layer 220; Power floor
221; First power layer 222; Second power layer
223; Third power layer

Claims (7)

Motor housing;
A stator installed inside the motor housing and including a stator core, a coil wound around the stator core, and a coil terminal coupled to an end of the coil;
A rotor rotatably installed at the center of the stator;
A sensing magnet module installed above the rotor to sense a position of the rotor;
A magnetic element disposed to face the sensing magnet module to sense a magnetic force of the sensing magnet module; And
And a multilayer printed circuit board including a sensor layer on which the magnetic element is mounted and a plurality of power layers respectively connected to different polarity power supplied to the coil.
The method of claim 1, wherein the plurality of power layers,
EPS motor, when connected to a three-phase power source, consisting of first to third power layers.
The method of claim 1, wherein the multilayer printed circuit board,
EPS motor covering the entire upper side of the motor housing.
The method of claim 3, wherein the multilayer printed circuit board,
EPS motor including a terminal hole through which the coil terminal is coupled.
The method of claim 4, wherein the terminal hole,
EPS motor is electrically connected to one of the first to third power layer.
The method of claim 4, wherein the terminal hole,
EPS motor is formed through the 18 through the circumferential surface of the multilayer printed circuit board.
The method of claim 6, wherein the terminal hole,
An EPS motor connected to another adjacent terminal hole and a different power supply layer, and the coil terminals coupled to the terminal hole receive power having different polarities from the coil terminals coupled to another terminal hole nearby.

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