KR102561350B1 - Circuit board, motor and electronic power steering system - Google Patents

Abstract

Embodiments of the present invention relate to a technology for securing the stability of vehicle driving, and by forming a plurality of power terminals for supplying power to a plurality of magnetic devices separately, even when a power terminal or grounding section is damaged due to a circuit defect. The minimum number of hall elements can be driven so that the risk of safety accidents can be remarkably reduced during vehicle driving.

Description

Circuit board, motor and electronic power steering system {Circuit board, motor and electronic power steering system}

Embodiments of the present invention relate to a technique for securing vehicle driving stability.

In general, as a device for ensuring the stability of steering of a vehicle, a steering device assisted by a separate power is used.

In the past, such an auxiliary steering device was used as a device using hydraulic pressure, but recently, an electronic power steering system with low loss of power and excellent accuracy is used. The electric power steering system (EPS) as described above guarantees turning stability and provides quick restoring force by driving a motor in an electronic control unit (ECU) according to driving conditions detected by a vehicle speed sensor, torque angle sensor, and torque sensor. This allows the driver to drive safely.

In the case of these EPS motors, the magnetic element mounted on the printed circuit board provides position information of the rotor (rotor) to the ECU, which plays a role in controlling the motor. However, if the supply of power to the Hall element is interrupted due to a defect in the circuit or the grounding part is damaged, the function of the magnetic element is lost, leading to a risk of safety accident while driving the vehicle.

(Patent Document 1) WO2006-109714 A1

The present invention has been devised to solve the above-mentioned problems, and in particular, by forming a plurality of power terminals for supplying power to a plurality of Hall elements separately, even when the power terminal or grounding part is damaged due to a defect in the circuit, the minimum Hall element is It is possible to provide a motor capable of significantly reducing the risk of a safety accident when driving a vehicle.

As a means for solving the above problems, in an embodiment of 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 magnet module installed above the rotor to sense the position of the rotor; a plurality of magnetic elements arranged adjacent to the magnet module to sense the magnetic force of the magnet module; and a printed circuit board including a plurality of power terminals on which the magnetic elements are mounted and to which power supplied to the magnetic elements is respectively connected, wherein at least two power terminals connected to the plurality of magnetic elements are provided. to provide a motor.

The circuit board according to the present embodiment includes a first magnetic element unit; a second magnetic element part spaced apart from the first magnetic element part; a first power terminal electrically connected to the first magnetic element unit; and a second power terminal spaced apart from the first power terminal and electrically connected to the second magnetic element unit, wherein the first magnetic element unit includes a plurality of magnetic elements and the second magnetic element unit includes a plurality of magnetic elements. wherein the plurality of magnetic elements of the first magnetic element part are disposed along a first circular arc having a first radius, and the plurality of magnetic elements of the second magnetic element part have a second radius greater than the first radius. The branches may be arranged along the second arc.

The first magnetic element part may include first to third magnetic elements spaced apart from each other, and the second magnetic element part may include fourth and fifth magnetic elements spaced apart from each other.

a first conductive line connected to the first power terminal, the first magnetic element, the second magnetic element, and the third magnetic element; and a second conductive line connected to the second power terminal, the fourth magnetic element, and the fifth magnetic element.

The first to fifth magnetic elements may be Hall elements that sense magnetic force.

a first grounding unit electrically connected to the first magnetic element unit; and a second grounding part electrically connected to the second magnetic element part and spaced apart from the first grounding part.

A central angle of the second circular arc may overlap at least a portion of a central angle of the first circular arc.

The motor according to this embodiment includes a circuit board; a housing accommodating the circuit board; a stator fixed to the housing; a rotor disposed inside the stator and rotating through electrical interaction with the stator; a rotating shaft integrally rotating with the rotor; and a sensing magnet disposed on the rotating shaft, wherein the circuit board includes a first magnetic element unit; a second magnetic element part spaced apart from the first magnetic element part; a first power terminal electrically connected to the first magnetic element unit; and a second power terminal spaced apart from the first power terminal and electrically connected to the second magnetic element unit, wherein the first and second magnetic element units of the circuit board detect the sensing magnet, and the first magnetic element unit detects the sensing magnet. The element portion includes a plurality of magnetic elements, the second magnetic element portion includes a plurality of magnetic elements, the plurality of magnetic elements of the first magnetic element portion are arranged along a first circular arc having a first radius, The plurality of magnetic elements of the second magnetic element unit may be disposed along a second arc having a second radius greater than the first radius.

A sensing plate spaced apart from the rotor upwardly and coupled to the rotating shaft may be included, and the sensing magnet may be coupled to an upper surface of the sensing plate.

The motor includes a first bearing supporting a lower portion of the rotating shaft; and a second bearing supporting an upper portion of the rotating shaft.

A support tube protrudes from a central portion of a lower surface of the housing, and the first bearing may be installed in the support tube.

An electric power steering device according to this embodiment includes a motor; and an electronic control device for driving a motor according to driving conditions of a vehicle, wherein the motor includes a circuit board; a housing accommodating the circuit board; a stator fixed to the housing; a rotor disposed inside the stator and rotating through electrical interaction with the stator; a rotating shaft integrally rotating with the rotor; and a sensing magnet disposed on the rotating shaft, wherein the circuit board includes a first magnetic element unit; a second magnetic element part spaced apart from the first magnetic element part; a first power terminal electrically connected to the first magnetic element unit; and a second power terminal spaced apart from the first power terminal and electrically connected to the second magnetic element unit, wherein the first and second magnetic element units of the circuit board detect the sensing magnet, and the first magnetic element unit detects the sensing magnet. The element portion includes a plurality of magnetic elements, the second magnetic element portion includes a plurality of magnetic elements, the plurality of magnetic elements of the first magnetic element portion are arranged along a first circular arc having a first radius, The plurality of magnetic elements of the second magnetic element unit may be disposed along a second arc having a second radius greater than the first radius.

The electric power steering device may include a sensor for detecting driving conditions of the vehicle.

The sensor may be a vehicle speed sensor, a torque angle sensor, or a torque sensor.

According to an embodiment of the present invention, by separately forming a plurality of power terminals for supplying power to a plurality of magnetic elements, even when a power terminal or a grounding part is damaged due to a defect in a circuit, the minimum hall element can be driven so that the vehicle is driven. has the effect of significantly reducing the risk of safety accidents.

1 is a cross-sectional conceptual view showing a motor according to an embodiment of the present invention.
2 is a conceptual diagram illustrating a circuit board according to an embodiment of the present invention.
3 is a conceptual diagram illustrating a circuit board according to a comparative example of the present invention.

Hereinafter, the configuration and operation according to the present invention will be described in detail with reference to the accompanying drawings. In the description with reference to the accompanying drawings, the same reference is given to the same components regardless of reference numerals, and redundant description thereof will be omitted. Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. These terms are only used for the purpose of distinguishing one component from another.

1 is a cross-sectional conceptual view showing a motor according to an embodiment of the present invention.

Referring to FIG. 1, this is an example of a motor applied to an electric steering device, and a housing H and a bracket 30 coupled to the housing H are provided. The upper surface of the housing H is open, and the support pipe 11 protrudes from the center of the lower surface. Also, the bracket 30 is coupled to the upper portion of the housing H to form an inner space.

A stator 200 and a rotor 300 are installed inside the housing H. The rotor 300 includes a rotor core 320 coupled to the rotating shaft 400 and a magnet 310 coupled to an outer circumferential surface of the rotor core 320 .

Meanwhile, a sensing plate 40 is coupled to the rotating shaft 400 to rotate together with the rotating shaft 400, and a sensing magnet 50 is installed on the sensing plate 40 (hereinafter, the sensing plate and the sensing magnet A structure containing is called a 'magnet module'). Also, a printed circuit board 100 may be installed on the bracket 30 , and a magnetic element 110 facing the sensing magnet 50 may be installed on the printed circuit board 100 . The magnetic element 110 detects the degree of rotation of the sensing magnet 50 and the degree of rotation of the sensing plate 40 and the rotating shaft 400 to which the sensing magnet 50 is coupled.

In an embodiment of the present invention, a printed circuit board having a plurality of magnetic elements 110 disposed adjacent to the magnet module to sense the magnetic force of the magnet module is provided, and in particular, power supplied to the magnetic elements is respectively Provides a structure of the printed circuit board 100 implemented in a structure in which a plurality of connected power terminals are separated and arranged. Through this, even if the power terminal or the grounding part is damaged due to a defect in the circuit, the minimum hall element can be driven, thereby preventing the risk of safety accident while driving the vehicle.

The arrangement structure of the printed circuit board 100 will be described with reference to FIGS. 2 and 3 .

As described above, the printed circuit board according to the embodiment of the present invention is characterized in that the circuit arrangement structure of the power supply stage for supplying power to a plurality of hall elements is formed separately.

That is, the structure of FIG. 3 is a comparative example compared to the embodiment of the present invention, and power supplied to each of the plurality of magnetic elements 101, 102, 103, 104, and 105 mounted on the printed circuit board 100 A power supply terminal (Vcc; 120) for applying is connected through a circuit pattern, and the power supply terminal 120 can be implemented in a structure grounded through one ground (GND; 130). However, this structure provides a fatal problem in that when there is a short circuit in the circuit pattern or damage to the ground terminal, the power supply to the entire magnetic element is stopped and the operation of the vehicle steering device stops or malfunctions.

Therefore, in the embodiment of the present invention, as in the structure shown in FIG. It is possible to implement by modifying the circuit design so that the magnetic elements are bundled into several groups and the power terminals supplied are separated and arranged. That is, as in the structure shown in FIG. 2, the three magnetic elements 111, 112, and 113 are formed as a group on the right side, and a first power terminal (VCC1; 122) for supplying power is disposed, , the second power terminal (VCC2; 124) for supplying power to the two magnetic elements (114, 115) is disposed on the left side. That is, the power terminals supplied to the magnetic elements are formed separately so that even if an error occurs in any one circuit pattern, all magnetic elements do not stop functioning, and the magnetic elements of the remaining defect-free parts can be driven. Of course, the first ground electrode terminal grounded to the first power terminal 122 and the second ground electrode terminal grounded to the second power terminal 124 may be separately formed to further reduce the risk of defects.

Of course, in the embodiment of FIG. 2, five magnetic elements are exemplified, but the present invention is not limited thereto, and it will be apparent to those skilled in the art that a plurality of magnetic elements may be disposed in addition to this, and thus descriptions thereof will be omitted. However, a plurality of power terminals connected to a plurality of magnetic elements may also be formed. That is, the power terminals are formed as a first power terminal connected to n magnetic elements adjacent to each other and a second power terminal connected to m magnetic elements separated from the n magnetic elements, but three or more power terminals can also be used. Implementation is possible (however, n and m are natural numbers). In addition, a Hall element can be applied to the magnetic element of the present invention.

Hereinafter, with reference to FIGS. 1 to 3, other configurations and actions of the EPS motor having a printed circuit board according to an embodiment of the present invention will be described.

That is, as described above in FIG. 1, the motor having a printed circuit board according to an embodiment of the present invention is provided with a housing (H) and a bracket 30 coupled to the housing (H). The upper surface of the housing H is open, and the support pipe 11 protrudes from the center of the lower surface. Also, the bracket 30 is coupled to the upper portion of the housing H to form an inner space. A first bearing 31 is installed in the support pipe 11, and a second bearing 32 is installed in the bracket 30. A rotating shaft 400 (shaft) is supported in contact with the first bearing 31 and the second bearing 32, and the upper portion of the rotating shaft 400 is supported by the second bearing 32 and the rotating shaft 400 The lower part of is supported by the first bearing 31.

The upper end of the rotating shaft 400 protrudes upward through the bracket 30, and the stator 200 and the rotor are inside the housing H coupled to the mechanism 60 connected to the steering shaft (not shown). 300 is installed. The rotor 300 includes a rotor core 320 coupled to the rotating shaft 400 and a magnet 310 coupled to an outer circumferential surface of the rotor core 320 . In this embodiment, a structure in which the magnet 310 is coupled to the outer circumferential surface of the rotor core 320 has been taken as an example, but, unlike this, a structure implemented in a structure in which the magnet 310 is inserted into the rotor core 320 may be applied. there is. The stator 200 includes a stator core 220 disposed between the magnet 310 and the housing H, and a coil 210 wound around the stator core 220.

As shown in FIG. 2 , the first magnetic element unit 110-1 may include a plurality of magnetic elements and the second magnetic element unit 110-2 may include a plurality of magnetic elements. More specifically, the first magnetic element unit 110-1 includes first to third magnetic elements 111, 112, and 113 spaced apart from each other, and the second magnetic element unit 110-2 includes fourth and third magnetic elements spaced apart from each other. A fifth magnetic element 114, 115 may be included. The plurality of magnetic elements of the first magnetic element part 110-1 are arranged along the first circular arc 170 having the first radius 171, and the plurality of magnetic elements of the second magnetic element part 110-2 are arranged along the first circular arc 170. It may be disposed along the second arc 180 having a second radius 181 greater than the first radius 171 .

As shown in FIG. 2, in this embodiment, the first conductive line 150 is connected to the first power terminal 122, the first magnetic element 111, the second magnetic element 112, and the third magnetic element 113. can be connected with Also, the second conductive line 160 may be connected to the second power terminal 124 , the fourth magnetic element 114 and the fifth magnetic element 115 .

In addition, the printed circuit board 100 may be installed on the bracket 30, and a plurality of magnetic elements 110 may be installed on the printed circuit board 100. In this case, the magnetic elements 110 may be The degree of rotation of the sensing magnet 50 is detected to detect the degree of rotation of the sensing plate 40 and the rotating shaft 400 to which the sensing magnet 50 is coupled. In particular, in this case, by separating and forming a plurality of power terminals that supply power to a plurality of magnetic elements, even if the power terminal or grounding part is damaged due to a defect in the circuit, it is possible to drive the minimum hall element, thereby preventing safety accidents while driving the vehicle. risk can be significantly reduced.

In the detailed description of the present invention as described above, specific embodiments have been described. However, various modifications are possible without departing from the scope of the present invention. The technical spirit of the present invention should not be limited to the described embodiments of the present invention and should not be defined by the claims as well as those equivalent to these claims.

100: printed circuit board
110, 111, 112, 113, 114, 115: magnetic element

Claims (20)

a first power stage;
a second power terminal spaced apart from the first power terminal;
a first ground electrode terminal;
a second ground electrode terminal spaced apart from the first ground electrode terminal;
a first magnetic element unit including a plurality of magnetic elements; and
A second magnetic element unit including a plurality of magnetic elements;
forming a first circular arc having a first radius connecting a plurality of magnetic elements of the first magnetic element part;
forming a second circular arc having a second radius greater than the first radius connecting a plurality of magnetic elements of the second magnetic element unit;
The first arc and the second arc have the same center,
An angle of at least a portion of the first circular arc with respect to the center does not overlap with an angle of the second circular arc with respect to the center. According to claim 1,
The first power terminal is electrically connected to one magnetic element among the first magnetic element parts,
The second power terminal is electrically connected to one magnetic element of the second magnetic element unit. According to claim 1,
The first power terminal and the second power terminal are electrically separated from the circuit board. According to claim 1,
The first magnetic element unit includes first to third magnetic elements,
The second magnetic element unit includes fourth and fifth magnetic elements. According to claim 4,
a first conductive line connecting the first power terminal, the first magnetic element, the second magnetic element, and the third magnetic element; and
A circuit board comprising a second conductive line connecting the second power terminal, the fourth magnetic element, and the fifth magnetic element. According to claim 4,
The first to fifth magnetic elements are Hall elements. According to claim 4,
The first to third magnetic elements are disposed along the first arc, and the fourth and fifth magnetic elements are disposed along the second arc. According to claim 2,
The first power terminal is disposed in a region closer to an outer edge of the board than the first circular arc. According to claim 1,
The first ground electrode terminal is electrically connected to one magnetic element among the first magnetic element parts,
The second ground electrode terminal is electrically connected to one magnetic element among the second magnetic element parts. According to claim 9,
The first ground electrode terminal and the second ground electrode terminal are electrically separated from the circuit board. According to claim 1
The first magnetic element unit includes a plurality of first magnetic elements,
The second magnetic element unit includes a plurality of second magnetic elements,
Some of the plurality of first magnetic elements are disposed along the first arc,
Some of the plurality of second magnetic elements are disposed along the second arc. According to claim 1,
The first arc and the second arc are concentric circuit board. According to claim 1,
A substrate comprising a first region and a second region spaced apart from each other;
The first magnetic element unit includes at least two first magnetic elements disposed in the first region;
The second magnetic element unit includes at least two second magnetic elements disposed in the second region. a rotatable sensing plate;
a sensing magnet disposed on the sensing plate; and
Including the circuit board of claim 1,
The sensing module of claim 1 , wherein the first magnetic element part or the second magnetic element part of the circuit board faces the sensing magnet. a substrate including a first surface;
a magnetic element unit disposed on the first surface of the substrate;
a power terminal disposed on the substrate and electrically connected to the magnetic element unit; and
A ground electrode terminal disposed on the substrate and electrically connected to the magnetic element unit,
The first surface of the substrate,
An inner edge formed as a curve, an outer edge formed as a curve, and a first region and a second region disposed between the inner edge and the outer edge,
the length of the outer edge is greater than the length of the inner edge;
The magnetic element part,
a first magnetic element part disposed in the first region and a second magnetic element part disposed in the second region;
The circuit board of claim 1 , wherein an angle of at least a portion of the first area does not overlap with that of the second area. According to claim 15,
The power stage,
a first power terminal electrically connected to one of the first magnetic element units; and
A circuit board comprising a second power terminal electrically connected to one of the second magnetic element units. According to claim 16,
The first power terminal and the second power terminal are electrically separated from the circuit board. According to claim 16,
The ground electrode terminal,
a first ground electrode terminal electrically connected to one of the first magnetic element parts; and
A circuit board including a second ground electrode terminal electrically connected to one of the second magnetic element parts. According to claim 18,
The first ground electrode terminal and the second ground electrode terminal are electrically separated from the circuit board. According to claim 16,
the inner edge has a first radius;
The outer edge has a second radius greater than the first radius.