Circuit board, motor and electric steering device

Abstract

To ensure that the risk of safety accidents is significantly reduced when the vehicle is in motion.SOLUTION: This embodiment of the invention relates to a technique for ensuring the stability of vehicle driving, and a minimum number of Hall elements can be driven even when the power supply end or ground is damaged due to a circuit defect, by forming a number of separate power supply ends 130, 140 that supply power to a number of magnetic elements 110.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] An embodiment of the present invention relates to a technique for ensuring stability of vehicle driving. [Background technology]

[0002] Generally, a steering device that uses a separate power to assist the steering is used to ensure the stability of steering of a vehicle.

[0003] Previously, such auxiliary steering devices were hydraulically operated, but recently, electronic power steering systems with less power loss and excellent accuracy have been used. Such electric power steering systems (EPS) operate the motor with an electronic control unit (ECU) according to driving conditions detected by vehicle speed sensors, torque angle sensors, and torque sensors, ensuring cornering stability and providing quick restoring force, allowing the driver to drive safely.

[0004] In the case of such EPS motors, the magnetic element mounted on the printed circuit board provides rotor position information to the ECU, which controls the motor. The driving of the magnetic element, which senses magnetic signals, is a very essential element. However, if the power supply to this Hall element is interrupted due to a defect in the circuit or the ground is damaged, the magnetic element will lose its function, creating a problem that could lead to a safety accident while the vehicle is running. Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention has been devised to solve the above-mentioned problems, and in particular, provides a motor that can significantly reduce the risk of safety accidents while the vehicle is running by forming a plurality of separate power supply terminals that supply power to a plurality of Hall elements, thereby enabling a minimum number of Hall elements to be driven even when the power supply terminal or ground part is damaged due to a circuit defect. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems, an embodiment of the present invention provides a circuit board including a first magnetic element portion, a second magnetic element portion spaced apart from the first magnetic element portion, a first power supply terminal electrically connected to the first magnetic element portion, and a second power supply terminal spaced apart from the first power supply terminal and electrically connected to the second magnetic element portion, wherein the first magnetic element portion is located on a first arc having a first radius, and the second magnetic element portion is located on a second arc having a second radius larger than the first radius and concentric with the first arc.

[0007] The first magnetic element unit includes first to third magnetic elements spaced apart from each other, and the second magnetic element unit includes fourth and fifth magnetic elements spaced apart from each other.

[0008] The circuit board further includes: a first conductive line connected to the first power supply terminal, the first magnetic element, the second magnetic element, and the third magnetic element; and a second conductive line connected to the second power supply terminal, the fourth magnetic element, and the fifth magnetic element.

[0009] The first to fifth magnetic elements provide a circuit board which is a Hall element for sensing a magnetic force.

[0010] The circuit board further includes a first ground part electrically connected to the first magnetic element part; and a second ground part spaced apart from the first ground part and electrically connected to the second magnetic element part.

[0011] A central angle of the second arc is provided on the circuit board such that the central angle of the second arc overlaps with at least a portion of the central angle of the first arc.

[0012] Further, according to an embodiment of the present invention, there is provided a motor including a circuit board, a housing for accommodating the circuit board, a stator fixed to the housing, a rotor located inside the stator and rotating through electrical interaction with the stator, a rotating shaft rotating integrally with the rotor, and a sensing magnet arranged on the rotating shaft, wherein the circuit board includes a first magnetic element unit, a second magnetic element unit spaced apart from the first magnetic element unit, a first power supply terminal electrically connected to the first magnetic element unit, and a second power supply terminal spaced apart from the first power supply terminal and electrically connected to the second magnetic element unit, the first magnetic element unit being located on a first arc having a first radius, and the second magnetic element unit being located on a second arc having a second radius larger than the first radius and concentric with the first arc, and the first and second magnetic element units of the circuit board detect the sensing.

[0013] The motor further includes a sensing plate spaced above the rotor and coupled to the rotating shaft, and the sensing magnet is coupled to an upper surface of the sensing plate.

[0014] The motor further includes a first bearing supporting a lower portion of the rotating shaft, and a second bearing supporting an upper portion of the rotating shaft.

[0015] The housing further includes a support tube protruding from a center of a lower surface thereof, and the first bearing provides a motor mounted on the support tube.

[0016] According to still another embodiment of the present invention, there is provided a vehicle having a motor and an electronic control device that drives the motor according to a driving condition of the vehicle, the motor including a circuit board, a housing that accommodates the circuit board, a stator fixed to the housing, a rotor located inside the stator and rotating through electrical interaction with the stator, a rotating shaft that rotates integrally with the rotor, and a sensing magnet disposed on the rotating shaft, the circuit board including a first magnetic element unit, a second magnetic element unit spaced apart from the first magnetic element unit, a first power supply terminal electrically connected to the first magnetic element unit, and a second power supply terminal spaced apart from the first power supply terminal and electrically connected to the second magnetic element unit, the first magnetic element unit having a first radius (a first radius), the first magnetic element portion is positioned on a first arc having a first radius, and the second magnetic element portion is positioned on a second arc having a second radius larger than the first radius and concentric with the first arc, and the first and second magnetic element portions of the circuit board sense the sensing magnet.

[0017] The electric steering system further includes a sensor for detecting the driving conditions of the vehicle.

[0018] The sensor may be a vehicle speed sensor, a torque angle sensor or a torque sensor. Effect of the Invention

[0019] According to an embodiment of the present invention, by forming a plurality of separate power supply terminals for supplying power to a plurality of magnetic elements, even if the power supply terminal or the ground part is damaged due to a defect in the circuit, a minimum number of Hall elements can be driven, thereby significantly reducing the risk of safety accidents while the vehicle is running. [Brief description of the drawings]

[0020] [Figure 1] 1 is a schematic cross-sectional view illustrating a motor according to an embodiment of the present invention; [Diagram 2] FIG. 1 is a conceptual diagram illustrating a circuit board according to a comparative example of the present invention. [Diagram 3] 1 is a conceptual diagram illustrating a circuit board according to an embodiment of the present invention; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] Hereinafter, the configuration and operation of 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 components are given the same reference numerals regardless of the drawing numerals, and the duplicated description thereof will be omitted. Terms such as first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The above terms are used only to distinguish one component from another.

[0022] FIG. 1 is a schematic cross-sectional view illustrating a motor according to an embodiment of the present invention. 1, a motor according to an embodiment of the present invention may include a housing 10, which is an exterior material. The housing 10 may include a case 12 having an internal space and an upper opening formed by a lower surface and a sidewall extending upward from the lower surface, and a bracket 11 covering the upper opening of the case 12 and having an opening formed in the center.

[0023] A stator 200 and a rotor 300 may be installed inside the housing 10. The rotor 300 may include a rotor core 320 coupled to a rotating shaft 400, and a magnet 310 coupled to an outer circumferential surface of the rotor core 320.

[0024] Meanwhile, the rotating shaft 400 may be located inside the housing 10, and the sensing magnet 50 may be located thereon. The sensing plate 190, which is located above the rotor 300 and spaced apart therefrom, may be coupled to the rotating shaft 400 and rotate together with the rotating shaft 400. The sensing magnet 50 may be coupled to an upper surface of the sensing plate 190. (Hereinafter, a structure including the sensing plate 190 and the sensing magnet 50 is referred to as a "magnet module.") And, the circuit board 100 may be installed on the bracket 11. More specifically, the circuit board 100 may be installed on the bracket 11 and accommodated inside the housing 10. The magnetic element 110 facing the sensing magnet 50 may be installed on the circuit board 100. The magnetic element 110 detects the degree to which the sensing magnet 50 has been rotated, and detects the degree to which the sensing plate 190 to which the sensing magnet 50 has been coupled and the rotating shaft 400 have been rotated.

[0025] In one embodiment of the present invention, a circuit board is provided that has a number of magnetic elements 110 arranged adjacent to a magnet module to sense the magnetic force of the magnet module, and the circuit board 110 is realized in a structure in which a number of power supply terminals to which power supplied to the magnetic elements is respectively connected are arranged separately.

[0026] Therefore, in the circuit board 100 according to an embodiment of the present invention, even if some power terminals or ground parts do not operate due to a circuit defect, the other power terminals and ground parts operate normally. As a result, the degree of rotation of the sensing magnet 50 can be sensed by the magnetic element that receives power from the normally operating power terminal.

[0027] FIG. 2 is a conceptual diagram illustrating a circuit board according to a comparative example of the present invention, and FIG. 3 is a conceptual diagram illustrating a circuit board according to an embodiment of the present invention.

[0028] As described above, the circuit board 100 according to the embodiment of the present invention is characterized in that the circuit arrangement structure of the power supply terminal that supplies power to a number of Hall elements is formed separately.

[0029] 2 is a comparative example compared to the embodiment of the present invention, and a power supply terminal (Vcc) 106 that supplies power to a number of magnetic elements 101, 102, 103, 104, and 105 mounted on the circuit board is connected via a circuit pattern, and the power supply terminal 106 is grounded via a single ground part (GND) 107. However, in the circuit board of the comparative example, if there is a short circuit in the circuit pattern or if the ground part is damaged, the power supply to all the magnetic elements is cut off. As a result, it causes a fatal problem that the operation of the steering device of the vehicle stops or malfunctions.

[0030] 3, a first magnetic element unit 110 and a second magnetic element unit 120 spaced apart from the first magnetic element unit 110 may be disposed on a substrate. The first magnetic element unit 110 may include first, second and third magnetic elements 111, 112 and 113 spaced apart from each other. The first, second and third magnetic elements 111, 112 and 113 may be electrically connected to a first power supply terminal (VCC1) 130 spaced apart therefrom. The first, second and third magnetic elements 111, 112 and 113 may be electrically connected to the first power supply terminal 130 by a first conductive line 150.

[0031] The second magnetic element unit 120 may include fourth and fifth magnetic elements 121 and 122 spaced apart from each other. The fourth and fifth magnetic elements 121 and 122 may be electrically connected to a second power supply terminal (VCC2) 140 spaced apart from each other. The fourth and fifth magnetic elements 121 and 122 may be electrically connected to the second power supply terminal 140 by a second conductive line 160. That is, the power supply terminal that supplies power to the magnetic elements may be formed separately. As a result, even if an abnormality occurs in any one of the circuit patterns, all the magnetic elements do not stop functioning, and a part of the magnetic elements that are not abnormal can be driven. Of course, a first ground part (not shown) electrically connected to the first power supply terminal 122 and grounded, and a second ground part (not shown) electrically connected to the second power supply terminal 124 and grounded may also be formed separately. The first ground part and the second ground part may be spaced apart from each other. In this case, the risk of failure can be further reduced. Of course, in the embodiment of FIG. 2, five magnetic elements are given, but it is obvious to those skilled in the art that the present invention is not limited to this and that many other magnetic elements can be arranged, and therefore the description will be omitted. Furthermore, the power supply terminals connected to the many magnetic elements can also be formed in a large number. That is, the power supply terminals are formed as a first power supply terminal connected to n magnetic elements adjacent to each other and a second power supply terminal connected to m magnetic elements separated from the n magnetic elements, but it can also be realized with three or more power supply terminals (where n and m are natural numbers). Furthermore, the magnetic element of the present invention can be a Hall element.

[0032] Hereinafter, another configuration and operation of an EPS motor including a circuit board 100 according to an embodiment of the present invention will be described with reference to FIGS.

[0033] That is, the motor including the circuit board 100 according to the embodiment of the present invention may further include a support tube 20 protruding from the center of the bottom surface of the case 12. A first bearing 31 may be installed in the support tube 20, and a second bearing 32 may be installed in the bracket 11. A rotating shaft 400 (shaft) is supported in contact with the first bearing 31 and the second bearing 32, and an upper portion of the rotating shaft 400 may be supported by the second bearing 32, and a lower portion of the rotating shaft 400 may be supported by the first bearing 31.

[0034] The upper end of the rotating shaft 400 may extend upward through the bracket 11 and may be coupled to a mechanism 60 coupled to a steering shaft (not shown). A stator 200 and a rotor 300 may be installed inside the housing 10. The rotor 300 may include a rotor core 320 coupled to the rotating shaft 400 and a magnet 310 coupled to the outer circumferential surface of the rotor core 320. In the present embodiment, the structure in which the magnet 310 is coupled to the outer circumferential surface of the rotor core 320 has been described, but a structure in which the magnet 310 is inserted inside the rotor core 320 may also be used. The stator may be fixed to the housing 10, and may include a stator core 210 disposed between the magnet 310 and the housing 10, and a coil 220 wound around the stator core 210. The stator 200 and the rotor 300 may have electrical interaction. As a result, the rotor 300 may rotate. In this case, the rotating shaft 400 may rotate integrally with the rotor 300.

[0035] A circuit board 100 is installed on the bracket 12, and first and second magnetic element parts 110 and 120 are arranged on the circuit board 100. In this case, the magnetic elements 111, 112, 113, 121 and 122 sense the degree to which the sensing magnet 50 has rotated, and sense the degree to which the sensing plate 190 and the rotating shaft 400 to which the sensing magnet 50 is coupled have rotated.

[0036] 2, the first magnetic element unit 110 may be positioned on a first circular arc 170 having a first radius 171, and the second magnetic element unit 120 may be positioned on a second circular arc 181 having a second radius 181 greater than the first radius 171 and concentric with the first circular arc. As a result, the first and second magnetic element units 110 and 120 are positioned along the moving path of the sensing magnet 50 that forms a circular locus, thereby improving sensing capability.

[0037] Furthermore, the central angle of the second arc is included in the central angle of the first arc. That is, the central angle of the second arc can overlap at least a part of the central angle of the first arc. As a result, the measured values ​​of the first and second magnetic element portions can be easily compared and analyzed, and the accuracy of the measurements can be mutually guaranteed. To summarize the above, the circuit board 100 of the present embodiment has multiple separate power supply terminals that supply power to multiple magnetic elements, so that even if the power supply terminal or ground is damaged due to a circuit defect, a minimum number of Hall elements can be driven, significantly reducing the risk of safety accidents while the vehicle is running.

[0038] In the above detailed description of the present invention, specific embodiments have been described. However, various modifications are possible without departing from the scope of the present invention. The technical idea of ​​the present invention should not be limited to the described embodiments of the present invention, but should be defined by the claims and equivalents thereto. [Explanation of symbols]

[0039] 100...circuit board, 106, 130, 140...power end, 107...Grounding part, 110, 120...magnetic element portion, 101, 102, 103, 104, 105, 111, 112, 113, 121, 122 Magnetic elements, 150, 160...conductive lines.

Claims

1. A substrate including a first surface; a magnetic element portion disposed on the first surface of the substrate; A power supply terminal disposed on the substrate and electrically connected to the magnetic element portion; and a ground portion disposed on the substrate and electrically connected to the magnetic element portion; the magnetic element unit includes a first magnetic element unit and a second magnetic element unit spaced apart from each other on the first surface of the substrate, The power supply terminal is a first power supply terminal electrically connected to the first magnetic element portion; and a second power supply terminal electrically connected to the second magnetic element portion; The circuit board, wherein the first power supply terminal is electrically isolated from the second power supply terminal.

2. the first magnetic element portion includes a first magnetic element, a second magnetic element, and a third magnetic element, The circuit board according to claim 1 , wherein the second magnetic element portion includes a fourth magnetic element and a fifth magnetic element.

3. a first conductive line connected to the first power supply terminal, the first magnetic element, the second magnetic element, and the third magnetic element; and The circuit board of claim 2 , further comprising a second conductive line connected to the second power terminal, the fourth magnetic element, and the fifth magnetic element.

4. 4. The circuit board according to claim 2, wherein the first to fifth magnetic elements are Hall elements for sensing a magnetic force.

5. The circuit board according to claim 1 , wherein the first power supply terminal is disposed on the first surface of the board and spaced apart from the first magnetic element portion.

6. a first ground portion electrically connected to the first magnetic element portion; and The circuit board according to claim 1 , further comprising a second ground part electrically connected to the second magnetic element part.

7. The circuit board according to claim 6 , wherein the first ground portion is electrically isolated from the second ground portion.

8. the first magnetic element portion includes a plurality of magnetic elements; a plurality of magnetic elements of the second magnetic element portion; the plurality of magnetic elements of the first magnetic element portion are positioned on a first arc having a first radius; The circuit board according to claim 1 , wherein the plurality of magnetic elements of the second magnetic element portion are positioned on a second arc having a second radius larger than the first radius.

9. The circuit board according to claim 8 , wherein the first arc and the second arc are concentric.

10. 10. The circuit board according to claim 8, wherein a central angle of the second arc overlaps at least a portion of a central angle of the first arc.

11. Circuit board; a housing for accommodating the circuit board; a stator fixed to the housing; a rotor located inside the stator and rotating through electrical interaction with the stator; A rotating shaft that rotates together with the rotor; and A sensing magnet is disposed on the rotating shaft, The circuit board includes: A substrate including a first surface; a magnetic element portion disposed on the first surface of the substrate; A power supply terminal disposed on the substrate and electrically connected to the magnetic element portion; and a ground portion disposed on the substrate and electrically connected to the magnetic element portion; the magnetic element unit includes a first magnetic element unit and a second magnetic element unit spaced apart from each other on the first surface of the substrate, The power supply terminal is a first power supply terminal electrically connected to the first magnetic element portion; and a second power supply terminal electrically connected to the second magnetic element portion; The motor, wherein the first power supply terminal is electrically isolated from the second power supply terminal.

12. The circuit board includes: a first ground portion electrically connected to the first magnetic element portion; and a second ground part electrically connected to the second magnetic element part, The motor of claim 11, wherein the first ground portion is electrically isolated from the second ground portion.

13. Motor; and An electronic control device that drives a motor according to the operating conditions of the vehicle; The motor is Circuit board; a housing for accommodating the circuit board; a stator fixed to the housing; a rotor located inside the stator and rotating through electrical interaction with the stator; A rotating shaft that rotates together with the rotor; and A sensing magnet is disposed on the rotating shaft, The circuit board includes: A substrate including a first surface; a magnetic element portion disposed on the first surface of the substrate; A power supply terminal disposed on the substrate and electrically connected to the magnetic element portion; and a ground portion disposed on the substrate and electrically connected to the magnetic element portion; the magnetic element unit includes a first magnetic element unit and a second magnetic element unit spaced apart from each other on the first surface of the substrate, The power supply terminal is a first power supply terminal electrically connected to the first magnetic element portion; and a second power supply terminal electrically connected to the second magnetic element portion; The electric steering apparatus according to claim 1, wherein the first power supply terminal is electrically isolated from the second power supply terminal.

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