Circuit board, rotating electrical machine, and pump

Abstract

To provide a circuit board which protects an electronic component, etc., without melting a current fuse even in a case where overcurrent flows through the circuit board due to short-circuiting, etc., of the electronic component, a rotary electric machine and a pump.SOLUTION: A circuit board 80 comprises a plurality of electronic components 81 and 82 and a wiring pattern provided in a circuit layer. The wiring pattern includes: a main pattern 83 electrically connecting the plurality of electronic components with a power source; and a sub pattern 84 branched from the main pattern 83 and connected with one electronic component. The sub pattern includes a plurality of fine line patterns 84a. The plurality of fine line patterns are connected in parallel with each other between the main pattern and the one electronic component. Cross-sectional areas of at least two fine line patterns among the plurality of fine line patterns are different from each other. A sum of cross-sectional areas of the plurality of fine line patterns is equal to or less than a cross-sectional area of the main pattern.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a circuit board, a rotating electrical machine, and a pump.

Background Art

[0002] Conventionally, in an electrical device used by being connected to a commercial power supply, when an overcurrent flows due to a short circuit or the like of an electrical element, a current fuse provided in the electrical circuit is blown to stop the current supply to the electrical circuit, thereby protecting electrical components and the like. For example, Patent Document 1 describes an electronic circuit device in which a fuse is attached to a printed wiring board.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the above-described electronic circuit device, when the current fuse blows, the current supply to the electronic circuit device stops. Therefore, in order to drive the electrical device again, it is necessary to replace the current fuse, and the maintenance is complicated.

[0005] One aspect of the present invention is to provide a circuit board, a rotating electrical machine, and a pump that can protect electronic components and the like without blowing a current fuse even when an overcurrent flows through the circuit board due to a short circuit or the like of the electronic components, in view of the above circumstances.

Means for Solving the Problems

[0006] One aspect of the circuit board of the present invention includes a plurality of electronic components and a wiring pattern provided on a circuit layer. The wiring pattern has a main pattern that electrically connects the plurality of electronic components and a power source, and a sub-pattern that branches off from the main pattern and is connected to one of the electronic components. The sub-pattern has a plurality of thin wire patterns. The plurality of thin wire patterns are connected in parallel to each other between the main pattern and one of the electronic components. Among the plurality of thin wire patterns, at least the cross-sectional areas of two thin wire patterns are different from each other. The sum of the cross-sectional areas of each of the plurality of thin wire patterns is equal to or less than the cross-sectional area of the main pattern.

[0007] One aspect of the rotating electrical machine of the present invention includes a rotor that can rotate about a central axis, a stator that faces the rotor with a gap therebetween, and the above-described circuit board. The above-described circuit board controls the current supplied to the stator.

[0008] One aspect of the pump of the present invention includes the above-described rotating electrical machine and a pump mechanism connected to the rotor.

Advantages of the Invention

[0009] According to one aspect of the present invention, in a circuit board, a rotating electrical machine, and a pump, even when an overcurrent flows through the circuit board due to a short circuit or the like of an electronic component, the electronic component and the like can be protected without blowing a current fuse.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

[0011] In the following description, the Z-axis is shown in the figures as appropriate. The Z-axis indicates the direction in which the central axis J of the rotor of the embodiment described below extends. The central axis J shown in each figure is a virtual axis. In the following description, the direction in which the central axis J extends, that is, the direction parallel to the Z-axis, is referred to as the "axial direction". The radial direction centered on the central axis J is simply referred to as the "radial direction". The circumferential direction centered on the central axis J is simply referred to as the "circumferential direction". The side (+Z side) in the axial direction toward which the arrow of the Z-axis points is referred to as the "one side in the axial direction". The side opposite to the side (+Z side) in the axial direction toward which the arrow of the Z-axis points (-Z side) is referred to as the "other side in the axial direction".

[0012] <First Embodiment> The pump 1 of the present embodiment shown in FIG. 1 is an electric pump attached to a device mounted on the vehicle 5. The device to which the pump 1 is attached may be an automatic transmission or a drive device that drives the axle of the vehicle 5. The pump 1 is, for example, an electric oil pump that supplies oil to a device mounted on the vehicle 5.

[0013] The pump 1 includes a rotating electric machine 2, a pump mechanism 60, and an oil seal 77. In the present embodiment, the rotating electric machine 2 is a motor. The rotating electric machine 2 of the present embodiment is an inner rotor type three-phase brushless DC motor. The rotating electric machine 2 may be a polyphase motor of four or more phases. The rotating electric machine 2 includes a housing 40, a motor unit 3, a first bearing 75, a second bearing 76, and a circuit board 80.

[0014] The housing 40 houses therein the motor unit 3, the first bearing 75, the second bearing 76, the oil seal 77, the pump mechanism 60, and the circuit board 80. The housing 40 has a main body cover 41 and a pump cover 42. The main body cover 41 and the pump cover 42 are separate members from each other. The pump cover 42 is fixed to the other axial side of the main body cover 41.

[0015] The main body cover 41 has a motor housing portion 41a, a pump housing portion 41b, a bearing holding portion 41e, and a circuit board holding portion 41f. In the present embodiment, the motor housing portion 41a, the pump housing portion 41b, the bearing holding portion 41e, and the circuit board holding portion 41f are parts of the same single member. The motor housing portion 41a houses therein the motor unit 3, the first bearing 75, the second bearing 76, the oil seal 77, and the circuit board 80. In the present embodiment, the motor housing portion 41a is cylindrical and extends in the axial direction about the central axis J. One axial end of the motor housing portion 41a is the one axial end of the main body cover 41. The other axial end of the motor housing portion 41a has a hole portion 41c that opens to the other axial side. The hole portion 41c is circular about the central axis J. The other axial end of the hole portion 41c is connected to the inside of the pump housing portion 41b.

[0016] The pump housing portion 41b is connected to the other axial side of the motor housing portion 41a. The pump housing portion 41b houses therein the pump mechanism 60. The pump housing portion 41b opens to the other axial side. The opening on the other axial side of the pump housing portion 41b is closed by the pump cover 42.

[0017] A bearing holding portion 41e is provided in a portion on the one axial side of the rotor 10 and the stator 71 inside the motor housing portion 41a. The bearing holding portion 41e is an annular plate shape about the central axis J. The plate surface of the bearing holding portion 41e faces the axial direction. The first bearing 75 is held on the inner peripheral surface of the bearing holding portion 41e.

[0018] The circuit board holding portion 41f is columnar and extends axially on one side from the bearing holding portion 41e. The circuit board holding portion 41f is disposed inside the motor housing portion 41a. A plurality of circuit board holding portions 41f are provided at intervals along the circumferential direction. In the present embodiment, three circuit board holding portions 41f are provided. Each circuit board holding portion 41f has a first portion 41g and a second portion 41h, respectively. Each first portion 41g is columnar and extends axially on one side from the bearing holding portion 41e. Each second portion 41h is columnar and extends axially on one side from the first portion 41g. The outer diameter of each second portion 41h is smaller than the outer diameter of each first portion 41g. The surfaces of each first portion 41g facing axially on one side support the circuit board 80, respectively. Thereby, the position of the circuit board 80 in the axial direction is determined. Each second portion 41h is fitted into a hole 80f provided in the circuit board 80, respectively. Thereby, the circuit board 80 is held by the circuit board holding portion 41f.

[0019] As shown in FIG. 1, the motor unit 3 has a rotor 10 and a stator 71. In the present embodiment, in the motor unit 3, the rotor 10 is rotationally driven about the central axis J by the current supplied from the circuit board 80, and the rotational drive torque is transmitted to the pump mechanism 60.

[0020] The rotor 10 is rotatable about the central axis J. The rotor 10 has a rotor body 11 and a shaft 20. The shaft 20 is fixed to the rotor body 11. The rotor 10 is rotatably supported about the central axis J by a first bearing 75 and a second bearing 76 that support the shaft 20. The rotor body 11 has a rotor core 12 and a magnet (not shown). The rotor core 12 is substantially cylindrical and extends axially about the central axis J. In the present embodiment, the rotor core 12 is made of a magnetic material. The magnet is fixed to the rotor core 12. In the present embodiment, the magnet is a permanent magnet.

[0021] The shaft 20 is cylindrical and extends axially about the central axis J. A portion of the shaft 20 on one axial side extends axially beyond the rotor core 12 on one axial side and is supported by the first bearing 75. A portion of the shaft 20 on the other axial side extends axially beyond the rotor core 12 on one axial side and protrudes into the inside of the pump housing portion 41b through the hole portion 41c from inside the motor housing portion 41a. A portion of the shaft 20 on the other axial side is supported by the second bearing 76. A portion of the shaft 20 on the other axial side is in contact with the oil seal 77. A portion of the shaft 20 on the other axial side is connected to the inner rotor 61.

[0022] As shown in FIG. 1, the stator 71 faces the rotor 10 with a gap therebetween. The stator 71 is located radially outside the rotor 10. The stator 71 includes a stator core 72, an insulator 73, and a plurality of coils 74. The stator 71 is fixed to the inner peripheral surface of the motor housing portion 41a.

[0023] The stator 71 generates a magnetic field when an electric current flows through it. The rotor 10 rotates due to the magnetic field of the stator 71. More specifically, an alternating current flows through the plurality of coils 74 of the stator 71. As a result, the magnetic poles of the magnetic field generated in the stator 71 are switched, and a rotational torque is generated in the rotor 10 by the magnetic force with the magnet. The plurality of coils 74 are each connected to the power module 87 of the circuit board 80 described later. Thereby, a three-phase alternating current is supplied to the plurality of coils 74. That is, a three-phase alternating current is supplied to the motor unit 3.

[0024] As shown in FIG. 1, an oil seal 77 is held in the hole portion 41c. Also, a second bearing 76 is held in the hole portion 41c on one axial side of the oil seal 77.

[0025] In this embodiment, the first bearing 75 and the second bearing 76 may be rolling bearings or ball bearings. The first bearing 75 rotatably supports a portion of the shaft 20 that is located on one axial side of the rotor body 11. The second bearing 76 rotatably supports a portion of the shaft 20 that is located on the other axial side of the rotor body 11.

[0026] In this embodiment, the oil seal 77 is a lip seal having a lip portion on the radially inner side. The oil seal 77 is disposed on the other axial side of the second bearing 76. The lip portion of the oil seal 77 is in contact with the outer peripheral surface of the shaft 20. Thereby, the oil seal 77 seals between the shaft 20 and the motor housing portion 41a.

[0027] As shown in FIG. 1, the pump mechanism 60 has an inner rotor 61 and an outer rotor 62. The inner rotor 61 is connected to a portion of the shaft 20 that protrudes inside the pump housing portion 41b. Thereby, the pump mechanism 60 is connected to the rotor 10. The inner rotor 61 is annular and surrounds the shaft 20. The outer rotor 62 is annular and surrounds the inner rotor 61. The inner rotor 61 and the outer rotor 62 mesh with each other. Therefore, when the inner rotor 61 rotates by the rotor 10, the outer rotor 62 also rotates.

[0028] As shown in FIG. 1, the circuit board 80 is housed inside the motor housing portion 41a. The circuit board 80 is disposed on one axial side of the shaft 20. As described above, the circuit board 80 is held by the circuit board holding portion 41f. The circuit board 80 is substantially disk-shaped with the central axis J as the center. The plate surface of the circuit board 80 faces the axial direction. As shown in FIG. 2, the circuit board 80 is electrically connected between the power supply 6 and the motor unit 3, which will be described later. The circuit board 80 converts the direct current supplied from the power supply 6 into an alternating current and supplies it to the stator 71 of the motor unit 3. The circuit board 80 controls the current supplied to the stator 71.

[0029] The power source 6 is one of a plurality of batteries mounted on the vehicle 5. The positive terminal of the power source 6 is electrically connected to the circuit board 80 via the current fuse 7 and the positive bus bar 8a. The negative terminal of the power source 6 is electrically connected to the circuit board 80 via the negative bus bar 8b. Thereby, a direct current is supplied to the circuit board 80. Note that the negative terminal of the power source 6 is grounded.

[0030] The current fuse 7 is one of the electronic components mounted on the vehicle 5. The current fuse 7 electrically connects the positive terminal of the power source 6 and the positive bus bar 8a. In the present embodiment, the current fuse 7 is composed of a glass tube (not shown) and lead wires (not shown) disposed inside the glass tube. The lead wires electrically connect the positive terminal of the power source 6 and the positive bus bar 8a. All the current supplied from the power source 6 to the circuit board 80 flows through the lead wires. The current fuse 7 is provided, for example, to protect other electronic components 81 provided on the circuit board 80 and the motor unit 3 from an overcurrent generated when a control circuit 90 (described later) on the circuit board 80 is short-circuited due to a failure of the electronic component 81 provided on the circuit board 80 or the like. As will be described later, when the control circuit 90 is short-circuited, the overcurrent Is flowing from the power source 6 to the control circuit 90 flows through the lead wires. At this time, a large amount of joule heat is generated in the lead wires. When the temperature of the lead wires reaches the melting point, the lead wires are melted and broken. Thereby, the electrical connection between the power source 6 and the circuit board 80 is interrupted. Therefore, the overcurrent flowing through the control circuit 90 is interrupted, and other electronic components 81 provided on the circuit board 80 and the motor unit 3 can be protected.

[0031] The positive bus bar 8a electrically connects the current fuse 7 and the positive-side connection terminal 80c of the circuit board 80. The negative bus bar 8b electrically connects the negative terminal of the power source 6 and the negative-side connection terminal 80d of the circuit board 80. A direct current is supplied from the power source 6 to the circuit board 80 via the positive bus bar 8a and the negative bus bar 8b.

[0032] As shown in FIG. 4, in the present embodiment, the circuit board 80 includes a wiring pattern 80a provided in the circuit layer 80b and a plurality of electronic components 81. The plurality of electronic components 81 include a capacitor 82 and a switching element 81e. The wiring pattern 80a and the plurality of electronic components 81 constitute a control circuit 90. The control circuit 90 converts the direct current supplied from the power source 6 into an alternating current and supplies it to the stator 71 of the motor unit 3. As shown in FIG. 2, in the present embodiment, the control circuit 90 has at least a power module 87 and a capacitor module 89.

[0033] As shown in FIG. 4, in the present embodiment, the circuit board 80 has a first circuit layer 80b1, a second circuit layer 80b2, a third circuit layer 80b3, and a fourth circuit layer 80b4. Each of the circuit layers 80b1, 80b2, 80b3, 80b4 is stacked in the axial direction. That is, the circuit board 80 has a plurality of stacked circuit layers 80b1, 80b2, 80b3, 80b4. Further, the circuit board 80 has a first insulating layer 88a, a second insulating layer 88b, and a third insulating layer 88c. The first circuit layer 80b1 is provided on the surface facing one side in the axial direction of the first insulating layer 88a. The second circuit layer 80b2 is provided on the surface facing the other side in the axial direction of the first insulating layer 88a. The second insulating layer 88b is provided on one side in the axial direction of the first circuit layer 80b1. The third circuit layer 80b3 is provided on the surface facing one side in the axial direction of the second insulating layer 88b. The third insulating layer 88c is provided on the other side in the axial direction of the second circuit layer 80b2. The fourth circuit layer 80b4 is provided on the surface facing the other side in the axial direction of the third insulating layer 88c.

[0034] Each of the circuit layers 80b1, 80b2, 80b3, 80b4 is provided with a wiring pattern 80a. In the present embodiment, the wiring pattern 80a is composed of a copper foil. The axial dimensions of the wiring pattern 80a provided in each of the circuit layers 80b1, 80b2, 80b3, 80b4, that is, the dimensions in the thickness direction are all 70 μm. That is, the dimensions of the wiring pattern 80a in the thickness direction are the same. Each of the circuit layers 80b1, 80b2, 80b3, 80b4 is electrically connected to each other via a plurality of through-holes (not shown) provided in the first insulating layer 88a, the second insulating layer 88b, the third insulating layer 88c, and a plurality of electronic components 81 electrically connected to the through-holes.

[0035] The first insulating layer 88a is a plate-shaped insulating layer obtained by impregnating a glass cloth base material with an epoxy resin. The melting point of the first insulating layer 88a is 550 °C. The first insulating layer 88a has the first circuit layer 80b1 on the surface facing one side in the axial direction and the second circuit layer 80b2 on the surface facing the other side in the axial direction. The wiring pattern 80a is formed by pasting dry films on both surfaces of the first insulating layer 88a provided with a copper foil layer, overlapping a mask on which a wiring pattern is printed on the dry film, exposing it to ultraviolet light, dissolving and removing the unnecessary dry film, and then removing the copper foil in the portions other than the wiring pattern by etching.

[0036] The second insulating layer 88b is adhesively fixed to the surface of the first insulating layer 88a facing one axial side. The second insulating layer 88b has a third circuit layer 80b3 on the surface facing one axial side. The third insulating layer 88c is adhesively fixed to the surface of the first insulating layer 88a facing the other axial side. The third insulating layer 88c has a fourth circuit layer 80b4 on the surface facing the other axial side. The second insulating layer 88b and the third insulating layer 88c are plate-shaped with insulation properties obtained by impregnating a glass cloth base material with an epoxy resin, similar to the first insulating layer 88a. The melting points of the second insulating layer 88b and the third insulating layer 88c are 550 °C. Note that the configurations of the first insulating layer 88a, the second insulating layer 88b, and the third insulating layer 88c are not limited to this embodiment, and for example, insulating materials such as fluororesin and ceramic can be used. The second insulating layer 88b and the third insulating layer 88c are each adhesively fixed to the first insulating layer 88a with a prepreg. The prepreg is, for example, a resin sheet in which a glass cloth is impregnated with a resin. In this embodiment, the prepreg constitutes a first adhesive layer 88d and a second adhesive layer 88e.

[0037] The third circuit layer 80b3 and the fourth circuit layer 80b4 are configured by the same procedure as the procedure for configuring the above-described first circuit layer 80b1. Insulating first protective layer 88f and second protective layer 88g are provided on the surfaces of the third circuit layer 80b3 and the fourth circuit layer 80b4, respectively. In this embodiment, the first protective layer 88f and the second protective layer 88g are each constituted by an epoxy resin. In this embodiment, the heat-resistant temperatures of the first protective layer 88f and the second protective layer 88g are 150 °C.

[0038] As shown in FIG. 2, the power module 87 converts the DC current supplied from the power supply 6 into a three-phase AC current and supplies it to the motor unit 3. The power module 87 has a plurality (six in this embodiment) of switching elements 81e. In this embodiment, the switching element 81e is one of the plurality of electronic components 81 provided on the circuit board 80. The switching element 81e of this embodiment is an insulated gate bipolar transistor (hereinafter, IGBT: Insulated Gate Bipolar Transistor). The switching element 81e may be a power semiconductor element other than the IGBT. For example, the switching element 81e may be a field effect transistor such as a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor).

[0039] The power module 87 is a three-phase inverter composed of six switching elements 81e. That is, the power module 87 has three phases corresponding to the U phase, V phase, and W phase, each phase having an arm composed of two switching elements. The midpoint of each arm is connected to the motor unit 3. In the circuit board 80 of this embodiment, one power module 87 is provided, and the power module 87 has six switching elements 81e. The configuration of the power module 87 is not limited to the configuration of this embodiment, and it may be composed of three power modules each having two switching elements 81e. As shown in FIG. 4, in this embodiment, the switching element 81e is attached to the surface facing the other side in the axial direction of the circuit board 80. Each switching element 81e may be attached to the surface facing one side in the axial direction of the circuit board 80.

[0040] As shown in FIG. 2, the positive-side terminals 87p of the three arms of the power module 87 are connected to the positive side of the capacitor module 89 via the main pattern 83 described later. The negative-side terminals 87n of the three arms of the power module 87 are connected to the negative side of the capacitor module 89 via the negative-side main pattern 86. In the present embodiment, three positive-side terminals 87p and three negative-side terminals 87n are provided respectively. Note that the power module 87 may be connected to a generator (not shown) instead of the motor unit 3. In this case, the circuit board 80 converts the power input from the generator into DC power and charges the power supply 6.

[0041] The capacitor module 89 smoothes the DC current supplied to the power module 87. The capacitor module 89 is connected in parallel with the power supply 6 and the power module 87. The capacitor module 89 is composed of a main pattern 83, a sub-pattern 84, a negative-side sub-pattern 85, a negative-side main pattern 86, and a capacitor 82. The main pattern 83, the sub-pattern 84, the negative-side sub-pattern 85, and the negative-side main pattern 86 are part of the wiring pattern 80a. In the present embodiment, the capacitor 82 is one of the plurality of electronic components 81. In the present embodiment, the capacitor 82 is a ceramic capacitor. The capacitor 82 is not limited to the present embodiment, and for example, a film capacitor can also be used.

[0042] In the present embodiment, the capacitor module 89 has five sub-patterns 84, five negative-side sub-patterns 85, and five capacitors 82 respectively. That is, the circuit board 80 includes a plurality of capacitors 82. Each capacitor 82 is connected in parallel with the power supply 6 and the power module 87 respectively. Each capacitor 82 is connected in parallel with each other. The positive-side terminal of each capacitor 82 is connected to the main pattern 83 via the sub-pattern 84. The negative-side terminal of each capacitor 82 is connected to the negative-side main pattern 86 via the negative-side sub-pattern 85. As shown in FIG. 4, the capacitor 82 is chamfered on the surface facing one axial side of the circuit board 80.

[0043] In addition, in this embodiment, even when the rotating electrical machine 2 and the pump 1 are driven with any one of the five capacitors 82 of the capacitor module 89 removed from the circuit board 80, the capacitor module 89 can smooth the direct current supplied to the power module 87. That is, in the circuit board 80 of this embodiment, even when one of the five capacitors 82 is in an open (disconnected) state, the rotating electrical machine 2 and the pump 1 can be stably driven. That is, in the circuit board 80 of this embodiment, even when one of the five sub-patterns 84 is in an open (disconnected) state, the rotating electrical machine 2 and the pump 1 can be stably driven. The capacitor module 89 has a plurality of capacitors 82 in order to ensure redundancy.

[0044] As shown in FIG. 4, in this embodiment, the main pattern 83, the sub-pattern 84, the negative-side sub-pattern 85, and the negative-side main pattern 86 are each provided in the third circuit layer 80b3. That is, the main pattern 83 and the sub-pattern 84 are provided in the third circuit layer 80b3 laminated on the outermost side. The dimensions in the thickness direction of the main pattern 83, the sub-pattern 84, the negative-side sub-pattern 85, and the negative-side main pattern 86 are all 70 μm.

[0045] As shown in FIG. 2, the main pattern 83 electrically connects the positive-side connection terminal 80c of the circuit board 80, the sub-pattern 84, and the positive-side terminal 87p. The main pattern 83 is electrically connected to the positive terminal of the power supply 6 via the positive-side connection terminal 80c, the positive bus bar 8a, and the current fuse 7. That is, the wiring pattern 80a has the main pattern 83 that electrically connects the plurality of electronic components 81 and the power supply 6. All the current supplied from the power supply 6 to the control circuit 90 flows through the main pattern 83. As shown in FIG. 3, in this embodiment, the dimension Wm in the width direction of the main pattern 83 is 1400 μm. The cross-sectional area Sm of the main pattern 83 is 98000 μm 2 is.

[0046] As shown in FIG. 2, the negative electrode side main pattern 86 electrically connects the negative electrode side connection terminal 80d of the circuit board 80, the negative electrode side sub-pattern 85, and the negative electrode side terminal 87n. The negative electrode side main pattern 86 is electrically connected to the negative electrode terminal of the power supply 6 via the negative electrode side connection terminal 80d and the negative bus bar 8b. The negative electrode side main pattern 86 is grounded. As shown in FIG. 3, in the present embodiment, the dimension Wm2 in the width direction of the negative electrode side main pattern 86 is 1400 μm. Therefore, the cross-sectional area Sm2 of the negative electrode side main pattern 86 is 98000 μm 2 is.

[0047] As shown in FIG. 2, the sub-pattern 84 electrically connects the main pattern 83 and the capacitor 82. As described above, in the present embodiment, five sub-patterns 84 are provided. That is, the circuit board 80 includes a plurality of sub-patterns 84. Each sub-pattern 84 is connected in parallel to each other between the main pattern 83 and the negative electrode side main pattern 86. One end of each sub-pattern 84 is connected to the main pattern 83. Each sub-pattern 84 branches from the main pattern 83. As shown in FIG. 4, the other end of each sub-pattern 84 is connected to the positive electrode side terminal 82p of the capacitor 82. As shown in FIG. 2, one sub-pattern 84 is connected to one capacitor 82. That is, each sub-pattern 84 is electrically connected to one capacitor 82. That is, the sub-pattern 84 is connected to one electronic component 81. In the present embodiment, the configuration of each sub-pattern 84 is the same except for the position connected to the main pattern 83. As shown in FIG. 3, in the present embodiment, each sub-pattern 84 has a first thin wire pattern 84a1 and a second thin wire pattern 84a2. That is, the sub-pattern 84 has a plurality of thin wire patterns 84a.

[0048] The first fine line pattern 84a1 and the second fine line pattern 84a2 are each connected to the main pattern 83 and the capacitor 82. That is, the plurality of fine line patterns 84a are connected in parallel to each other between the main pattern 83 and one electronic component 81. One end of each of the first fine line pattern 84a1 and the second fine line pattern 84a2 pattern is connected to the main pattern 83. The first fine line pattern 84a1 and the second fine line pattern 84a2 each branch from the main pattern 83. As shown in FIG. 4, the other ends of the first fine line pattern 84a1 and the second fine line pattern 84a2 are each connected to the positive terminal 82p of the capacitor 82. As shown in FIG. 3, in the present embodiment, each sub-pattern 84 has two first fine line patterns 84a1 and two second fine line patterns 84a2, respectively. That is, the sub-pattern 84 has a plurality of first fine line patterns 84a1. Also, the sub-pattern 84 has a plurality of second fine line patterns 84a2. In the present embodiment, the two first fine line patterns 84a1 are arranged sandwiched between the two second fine line patterns 84a2. Note that the two first fine line patterns 84a1 may be arranged sandwiching the two second fine line patterns 84a2. Also, the distance Ws between the center positions in the width direction of two adjacent fine line patterns 84a arranged adjacent to each other is all 600 μm. That is, the distance Ws between the center positions in the width direction of two adjacent fine line patterns 84a arranged adjacent to each other is all the same distance.

[0049] In the present embodiment, the dimension W1 in the width direction of the first fine line pattern 84a1 is 280 μm, and the dimension W2 in the width direction of the second fine line pattern 84a2 is 300 μm. As described above, in the present embodiment, the dimension in the thickness direction of the sub-pattern 84 is 70 μm. Therefore, the cross-sectional area S1 of one first fine line pattern 84a1 is 19600 μm 2 and the cross-sectional area S2 of one second fine line pattern 84a2 is 21000 μm 2That is, among the plurality of thin line patterns 84a, the cross-sectional areas S1 and S2 of at least two thin line patterns 84a1 and 84a2 are different from each other. In this embodiment, the dimensional lengths La in the length direction of the first thin line pattern 84a1 and the second thin line pattern 84a2 are all 500 μm.

[0050] Also, as described above, the dimensional length in the thickness direction of the main pattern 83 is 70 μm. Therefore, the dimensional lengths in the thickness direction of each of the plurality of thin line patterns 84a are the same as the dimensional length in the thickness direction of the main pattern 83. Also, as described above, the dimensional length Wm in the width direction of the main pattern 83 is 1400 μm. That is, the dimensional lengths W1 and W2 in the width direction of each of the plurality of thin line patterns 84a1 and 84a2 are different from the dimensional length Wm in the width direction of the main pattern 83. Also, as described above, the cross-sectional area Sm of the main pattern 83 is 98000 μm 2 is. The sum Sa of the cross-sectional areas of the two first thin line patterns 84a1 and the cross-sectional areas of the two second thin line patterns 84a2 is 81200 μm 2 is. That is, the sum Sa of the cross-sectional areas of the plurality of thin line patterns 84a is equal to or less than the cross-sectional area Sm of the main pattern 83.

[0051] As shown in FIG. 2, the negative electrode side sub-pattern 85 electrically connects the negative electrode side main pattern 86 and the capacitor 82. As described above, in this embodiment, five negative electrode side sub-patterns 85 are provided. Each negative electrode side sub-pattern 85 is connected in parallel with each other between the main pattern 83 and the negative electrode side main pattern 86. One end of each negative electrode side sub-pattern 85 is connected to the negative electrode side main pattern 86, respectively. Each negative electrode side sub-pattern 85 branches from the negative electrode side main pattern 86, respectively. As shown in FIG. 4, the other end of each negative electrode side sub-pattern 85 is connected to the negative electrode side terminal 82n of the capacitor 82, respectively. In this embodiment, the configuration of each negative electrode side sub-pattern 85 is the same except for the position connected to the negative electrode side main pattern 86. As shown in FIG. 3, in this embodiment, the dimensional length Wn in the width direction of the negative electrode side sub-pattern 85 is 2200 μm. The cross-sectional area Sn of the negative electrode side sub-pattern 85 is 154000 μm 2That is, in the present embodiment, the dimension Ln in the length direction of the negative electrode side sub-pattern 85 is 500 μm.

[0052] Next, when the inside of one capacitor 82a included in the circuit board 80 is short-circuited, the current flowing through the control circuit 90 and the fusing of the sub-pattern 84 will be described. As shown in FIG. 5, when the inside of the capacitor 82a is short-circuited, the positive electrode terminal and the negative electrode terminal of the power source 6 are directly electrically connected. Therefore, an overcurrent Is flows through the current fuse 7, the positive bus bar 8a, a part of the main pattern 83, a part of the negative electrode side main pattern 86, the negative bus bar 8b, the sub-pattern 84 connected to the capacitor 82a, and the negative electrode side sub-pattern 85. As described above, when the overcurrent Is flows through the lead wire (not shown) of the current fuse 7, a large amount of Joule heat is generated in the lead wire, so there is a risk that the lead wire will be fused. When the lead wire of the current fuse 7 is fused, in order to drive the rotating electric machine 2 and the pump 1 again, it is necessary to replace the current fuse 7 attached to the vehicle 5, and the replacement work becomes complicated.

[0053] According to this embodiment, the wiring pattern 80a has a main pattern that electrically connects a plurality of electronic components 81 and a power supply 6, and a sub-pattern 84 that branches from the main pattern 83 and is connected to one electronic component 81. The sub-pattern 84 has a plurality of thin wire patterns 84a, and the plurality of thin wire patterns 84a are connected in parallel to each other between the main pattern 83 and one of the electronic components. Among the plurality of thin wire patterns 84a, at least the cross-sectional areas S1 and S2 of two thin wire patterns 84a1 and 84a2 are different from each other, and the sum Sa of the cross-sectional areas of each of the plurality of thin wire patterns 84a is equal to or less than the cross-sectional area Sm of the main pattern 83. As described above, when one electronic component 81 is short-circuited, an overcurrent Is flows through the plurality of thin wire patterns 84a of the sub-pattern 84, so that a large amount of Joule heat is generated in each of the thin wire patterns 84a. The temperature of each thin wire pattern 84a when the overcurrent Is flows is determined first by the amount of Joule heat generated in each thin wire pattern 84a and second by the heat dissipation amount of each thin wire pattern 84a that dissipates heat to the outside of each thin wire pattern 84a. First, the amount of Joule heat generated in each thin wire pattern 84a is proportional to the resistance value of each thin wire pattern 84a. That is, the amount of Joule heat generated in each thin wire pattern 84a is inversely proportional to the cross-sectional area of each thin wire pattern 84a. Therefore, among the thin wire patterns 84a, the amount of Joule heat of the thin wire pattern with a smaller cross-sectional area is larger than the amount of Joule heat of the thin wire pattern with a larger cross-sectional area. Second, the heat dissipation of each thin wire pattern 84a is mainly the heat transfer from each thin wire pattern 84a to the main pattern 83. Therefore, the heat dissipation amount of each thin wire pattern 84a is larger as the cross-sectional area of each thin wire pattern 84a is larger. Therefore, among the thin wire patterns 84a, the heat dissipation amount of the thin wire pattern with a smaller cross-sectional area is smaller than the heat dissipation amount of the thin wire pattern with a larger cross-sectional area. From the above, when the overcurrent Is flows through the sub-pattern 84, the temperature rise of the thin wire pattern with the smallest cross-sectional area is the largest, so the thin wire pattern with the smallest cross-sectional area is the first to be blown. When the thin wire pattern with the smallest cross-sectional area is blown, the current flowing through the other thin wire patterns increases, so the thin wire pattern with the second smallest cross-sectional area is quickly blown.After that, when the thin wire patterns with small cross-sectional areas are sequentially and rapidly severed, and finally the thin wire pattern with the largest cross-sectional area is severed, the sub-pattern 84 is severed. As a result, the state where the positive terminal and the negative terminal of the power supply 6 are directly electrically connected is eliminated, so the overcurrent Is flowing through the control circuit 90 is eliminated. In the present embodiment, since the cross-sectional area of each thin wire pattern 84a is provided to be small, the Joule heat generated in each thin wire pattern 84a can be suitably increased by the overcurrent Is. Therefore, each thin wire pattern 84a is rapidly severed, and as a result, the sub-pattern 84 can be rapidly severed. Therefore, the sub-pattern 84 can be severed before the lead wire of the current fuse 7 is severed. That is, in the present embodiment, it is possible to suppress the lead wire of the current fuse 7 from being severed. In addition, since the sub-pattern 84 is rapidly severed and the overcurrent Is flowing through the control circuit 90 can be rapidly eliminated, other electronic components 81 provided on the circuit board 80 and the motor unit 3 can be protected. Therefore, the electronic components 81 and the like can be protected without severing the current fuse 7.

[0054] Also, in the present embodiment, the sum Sa of the cross-sectional areas of the plurality of thin wire patterns 84a is equal to or less than the cross-sectional area Sm of the main pattern 83. That is, the cross-sectional area Sa of the sub-pattern 84 is equal to or less than the cross-sectional area Sm of the main pattern 83. Therefore, the amount of Joule heat generated in the sub-pattern 84 is larger than the amount of Joule heat generated in the main pattern 83. Also, the heat dissipation amount of the sub-pattern 84 is smaller than the heat dissipation amount of the main pattern 83. Therefore, when the electronic component 81 is short-circuited and the overcurrent Is flows through the control circuit 90, the temperature of the sub-pattern 84 becomes higher than the temperature of the main pattern 83, so the sub-pattern 84 is severed. That is, it is possible to suppress the main pattern 83 from being severed. Therefore, even after one sub-pattern 84 connected to the short-circuited electronic component 81 is severed, the main pattern 83 can supply current to other electronic components 81.

[0055] According to this embodiment, the sub-pattern 84 has a first thin wire pattern 84a1 and a second thin wire pattern 84a2. The cross-sectional area S1 of the first thin wire pattern 84a1 is different from the cross-sectional area S2 of the second thin wire pattern 84a2, and the sub-pattern 84 has a plurality of first thin wire patterns 84a1. Therefore, the cross-sectional area S1 of each first thin wire pattern 84a1 can be more easily made smaller than the cross-sectional area S2 of the second thin wire pattern 84a2. Thus, the amount of Joule heat generated in each first thin wire pattern 84a1 can be made larger than the amount of Joule heat generated in the second thin wire pattern 84a2. Second, the heat dissipation amount of each first thin wire pattern 84a1 can be made smaller than the heat dissipation amount of the second thin wire pattern 84a2. Therefore, when the electronic component 81 is short-circuited and an overcurrent Is flows through the control circuit 90, each first thin wire pattern 84a1 can be blown more quickly. When each first thin wire pattern 84a1 is blown, the current flowing through the second thin wire pattern 84a2 increases, so the second thin wire pattern 84a2 can be blown quickly. Therefore, in this embodiment, the sub-pattern 84 can be blown more quickly, so that the lead wire of the current fuse 7 can be more preferably suppressed from being blown. Therefore, the electronic component 81 and the like can be protected without blowing the current fuse 7.

[0056] According to this embodiment, the sub-pattern 84 has a plurality of second thin wire patterns 84a2. Therefore, the cross-sectional area S2 of each second thin wire pattern 84a2 can be easily made smaller. In this embodiment, the cross-sectional area S1 of one first thin wire pattern 84a1 is smaller than the cross-sectional area S2 of one second thin wire pattern 84a2. Thus, after each first thin wire pattern 84a1 is blown, each second thin wire pattern 84a2 can be blown more quickly. That is, the sub-pattern 84 can be blown more quickly. Therefore, the electronic component 81 and the like can be protected without blowing the current fuse 7.

[0057] According to this embodiment, the thickness-direction dimension of each of the plurality of fine line patterns 84a is the same as the thickness-direction dimension of the main pattern 83, and the width-direction dimensions W1 and W2 of each of the plurality of fine line patterns 84a are different from the width-direction dimension Wm of the main pattern 83. In order to make the cross-sectional area of the main pattern 83 and the cross-sectional area of each of the plurality of fine line patterns 84a different cross-sectional areas, it is necessary to make at least one of the thickness-direction dimension or the width-direction dimension of each pattern a different dimension. However, the thickness-direction dimension of the copper foil provided on each insulating layer surface of the circuit board 80 is a uniform dimension within each insulating layer surface. Therefore, in order to make the thickness-direction dimensions of the main pattern 83 and the plurality of fine line patterns 84a different dimensions, it is necessary to arrange the main pattern 83 and the plurality of fine line patterns 84a in different circuit layers. In this case, the path of the wiring pattern 80a becomes complicated, and there is a possibility that it is necessary to provide separate circuit layers with different copper foil thicknesses. Therefore, the manufacturing cost of the circuit board 80 increases. In this embodiment, since the thickness-direction dimensions of the main pattern 83 and the plurality of fine line patterns 84a are all the same dimension, the main pattern 83 and the plurality of fine line patterns 84a can be arranged in the same third circuit layer 80b3. Therefore, the path of the wiring pattern 80a can be simplified, and there is no need to provide a separate circuit layer. On the other hand, the width-direction dimension Wm of the main pattern 83 and the width-direction dimensions W1 and W2 of the plurality of fine line patterns 84a can be easily made different dimensions depending on the shape of the wiring pattern printed on the mask. Therefore, the cross-sectional area of the main pattern 83 and the cross-sectional areas of the plurality of fine line patterns 84a can be easily made different cross-sectional areas. Therefore, an increase in the manufacturing cost of the circuit board 80 can be suppressed.

[0058] According to the present embodiment, the intervals Ws between the center positions in the width direction of two fine wire patterns 84a arranged adjacent to each other are all the same. When designing the shape of the wiring pattern 80a, after determining the center positions in the width direction of a plurality of fine wire patterns 84a and the like, the dimensions in the width direction of the plurality of fine wire patterns 84a and the like are determined. As described above, the dimensions in the width direction of the fine wire patterns 84a and the like can be easily changed by the wiring pattern printed on the mask. Therefore, since the intervals Ws between the center positions in the width direction of two adjacent fine wire patterns 84a are the same, the design of the wiring pattern 80a becomes easy. Thus, it is possible to suppress an increase in the design man-hours of the circuit board 80.

[0059] According to the present embodiment, one electronic component is the capacitor 82. Therefore, even if the capacitor 82 is short-circuited due to a failure and an overcurrent Is flows through the control circuit 90, the sub-pattern 84 can be quickly blown. Thus, it is possible to protect the electronic component 81 and the like without blowing the current fuse 7.

[0060] Also, in the present embodiment, only one capacitor 82 is provided between one sub-pattern 84 and one negative electrode side sub-pattern 85. For example, when two or more capacitors 82 are directly connected and provided between one sub-pattern 84 and one negative electrode side sub-pattern 85, even if one electronic component capacitor 82 is short-circuited due to a failure, the remaining capacitors 82 can suppress an overcurrent Is from flowing through the control circuit 90. However, in such a circuit board 80, since the capacitor 82 requires a large installation area, the circuit board 80 becomes large. Also, the manufacturing man-hours and manufacturing costs of the circuit board 80, the rotating electric machine 2, and the pump 1 increase. As described above, in the present embodiment, even if the capacitor 82 is short-circuited due to a failure and an overcurrent Is flows through the control circuit 90, the sub-pattern 84 can be quickly blown, so that it is possible to suppress an increase in the size of the circuit board 80 and an increase in the manufacturing man-hours and manufacturing costs of the circuit board 80, the rotating electric machine 2, and the pump 1.

[0061] According to this embodiment, a plurality of capacitors 82 and a plurality of sub-patterns 84 are provided, and each of the plurality of sub-patterns 84 is electrically connected to one capacitor 82. Therefore, when one capacitor 82 is short-circuited and an overcurrent Is flows through the control circuit 90, the sub-pattern 84 electrically connected to the short-circuited capacitor 82 can be quickly blown. Therefore, the electronic components 81 and the like can be protected without blowing the current fuse 7.

[0062] Also, in this embodiment, as described above, even if one of the five sub-patterns 84 is opened due to being blown or the like, the pump 1 can be stably driven. Also, as described above, even if one capacitor 82 is short-circuited and an overcurrent Is flows through the control circuit 90, the sub-pattern 84 electrically connected to the short-circuited capacitor 82 can be quickly blown, so that the short circuit between the positive terminal of the power supply 6 and the ground can be eliminated without blowing the current fuse 7. Also, as described above, since the cross-sectional area Sa of the sub-pattern 84 is less than or equal to the cross-sectional area Sm of the main pattern 83, the melting of the main pattern 83 can be suppressed even when an overcurrent Is flows through the control circuit 90. Also, as described above, the cross-sectional area Sm2 of the negative-side main pattern 86 is 98000 μm 2 That is, the cross-sectional area Sa of the sub-pattern 84 is less than or equal to the cross-sectional area Sm2 of the negative-side main pattern 86. Therefore, the melting of the negative-side main pattern 86 can be suppressed even when an overcurrent Is flows through the control circuit 90. Thus, even after one sub-pattern 84 connected to the short-circuited capacitor 82 is blown, the control circuit 90 can supply current to other electronic components 81. Therefore, even if one capacitor 82 is short-circuited, the rotating electric machine 2 and the pump 1 can be continuously driven without replacing the circuit board 80 and the current fuse 7. Therefore, the maintainability of the rotating electric machine 2 and the pump 1 can be improved.

[0063] According to the present embodiment, in the circuit board 80 having a plurality of stacked circuit layers 80b, the main pattern 83 and the sub-pattern 84 are provided in the outermost stacked circuit layer. In the present embodiment, the main pattern 83 and the sub-pattern 84 are provided in the third circuit layer 80b3 stacked on one side in the axial direction. Also, as described above, the heat-resistant temperature of the first protective layer 88f located on one side in the axial direction of the third circuit layer 80b3 is lower than the melting temperature of the second insulating layer 88b disposed on the other side in the axial direction of the third circuit layer 80b3. Therefore, when the capacitor 82 is short-circuited and the temperature of the sub-pattern 84 rises due to the overcurrent Is, the portion of the first protective layer 88f in contact with the sub-pattern 84 melts, so that the sub-pattern 84 is exposed to the outside of the circuit board 80. Thus, the melted sub-pattern 84 leaks out to the surface on one side in the axial direction of the circuit board 80, so that it is possible to prevent the melted sub-pattern 84 from coming into contact with other wiring patterns disposed in the third circuit layer 80b3 and the wiring patterns of other circuit layers. Therefore, it is possible to suppress failures such as short circuits of other wiring patterns disposed in the third circuit layer 80b3 and the wiring patterns 80a of other circuit layers. Therefore, even if one capacitor 82 is short-circuited, the rotating electric machine 2 and the pump 1 can be continuously driven without replacing the circuit board 80 and the current fuse 7. Therefore, the maintainability of the rotating electric machine 2 and the pump 1 can be improved.

[0064] Also, in the present embodiment, the main pattern 83 and the sub-pattern 84 are provided in the third circuit layer 80b3. Thus, the configuration of the wiring pattern 80a can be simplified. Therefore, an increase in the manufacturing man-hours of the circuit board 80 can be suppressed. Therefore, an increase in the manufacturing man-hours of the rotating electric machine 2 and the pump 1 can be suppressed.

[0065] <Second Embodiment> As shown in FIG. 6, in the circuit board 280 of the present embodiment, each of the plurality of fine wire patterns 284a included in the sub-pattern 284 has a portion where the dimension in the width direction is different in the length direction. In the present embodiment, the length direction of the pattern is the direction in which current flows in each pattern. In FIG. 6, the length direction of the main pattern 83 and the main negative electrode pattern 86 is the horizontal direction. The length direction of the sub-pattern 284, each fine wire pattern 284a, and the sub-negative electrode pattern 85 is the vertical direction. In the present embodiment, the sub-pattern 284 has two first fine wire patterns 284a1 and two second fine wire patterns 284a2.

[0066] The first fine wire pattern 284a1 and the second fine wire pattern 284a2 are each connected to the main pattern 83 and the capacitor 82. The plurality of fine wire patterns 284a are connected in parallel to each other between the main pattern 83 and the capacitor 82. In the present embodiment, the two first fine wire patterns 284a1 are arranged sandwiched between the two second fine wire patterns 284a2. Also, the interval Ws between the center positions in the width direction of two adjacent fine wire patterns 284a arranged adjacent to each other is all 600 μm. That is, the interval Ws between the center positions in the width direction of two adjacent fine wire patterns 284a arranged adjacent to each other is the same interval.

[0067] In the present embodiment, the first fine wire pattern 284a1 has different dimensions in the width direction in the length direction. The first fine wire pattern 284a1 has a first portion 284a11, a second portion 284a12, and a third portion 284a13. One end of the first portion 284a11 is connected to the main pattern 83. The dimension W11 in the width direction of the first portion 284a11 is 280 μm. The cross-sectional area S11 of the first portion 284a11 is 19600 μm 2 is. One end of the second portion 284a12 is connected to the other end of the first portion 284a11. The dimension W1min in the width direction of the second portion 284a12 is 200 μm. The cross-sectional area S1min of the second portion 284a12 is 14000 μm 2It is so. One end of the third portion 284a13 is connected to the other end of the second portion 284a12. The other end of the third portion 284a13 is connected to the positive terminal 82p of the capacitor 82. The dimension W13 in the width direction of the third portion 284a13 is 280 μm. The cross-sectional area S13 of the third portion 284a13 is 19600 μm 2 It is so. That is, the first fine line pattern 284a1 has a second portion 284a12 whose dimension in the width direction and cross-sectional area are smaller than those of other portions. The minimum dimension W1min in the width direction of the first fine line pattern 284a1 is 200 μm. The minimum cross-sectional area S1min of the first fine line pattern 284a1 is 14000 μm 2 It is so.

[0068] In the present embodiment, the second fine line pattern 284a2 has different dimensions in the width direction in the length direction. The second fine line pattern 284a2 has a fourth portion 284a21, a fifth portion 284a22, and a sixth portion 284a23. One end of the fourth portion 284a21 is connected to the main pattern 83. The dimension W21 in the width direction of the fourth portion 284a21 is 300 μm. The cross-sectional area S21 of the fourth portion 284a21 is 21000 μm 2 It is so. One end of the fifth portion 284a22 is connected to the other end of the fourth portion 284a21. The minimum dimension W2min in the width direction of the fifth portion 284a22 is 220 μm. The cross-sectional area S2min of the fifth portion 284a22 is 15400 μm 2 It is so. One end of the sixth portion 284a23 is connected to the other end of the fifth portion 284a22. The other end of the sixth portion 284a23 is connected to the positive terminal 82p of the capacitor 82. The dimension W23 in the width direction of the sixth portion 284a23 is 280 μm. The cross-sectional area S23 of the sixth portion 284a23 is 21000 μm 2 It is so. That is, the second fine line pattern 284a2 has a fifth portion 284a22 whose dimension in the width direction and cross-sectional area are smaller than those of other portions. The minimum dimension W2min in the width direction of the second fine line pattern 284a2 is 220 μm. The minimum cross-sectional area S2min of the second fine line pattern 284a2 is 15400 μm 2 It is so. That is, among the plurality of fine line patterns 284a, at least the minimum cross-sectional areas S1min and S2min of the two fine line patterns 284a1 and 284a2 are different from each other.

[0069] In this embodiment, the dimension in the width direction of the main pattern 83 is 1400 μm throughout the length direction. That is, the minimum dimension Wmmin in the width direction of the main pattern 83 is 1400 μm, and the minimum cross-sectional area Smmin is 98000 μm 2 ². Also, the sum Samin of the minimum cross-sectional area S1min of the two first fine line patterns 84a1 and the minimum cross-sectional area S2min of the two second fine line patterns 84a2 is 58800 μm 2 ². That is, the sum Samin of the minimum cross-sectional areas of each of the plurality of fine line patterns 284a is less than or equal to the minimum cross-sectional area Smmin of the main pattern 83. That is, the minimum cross-sectional area Samin of the sub-pattern 284 is less than or equal to the minimum cross-sectional area Smmin of the main pattern 83.

[0070] Also, in this embodiment, the dimension in the width direction of the negative electrode side main pattern 86 is 1400 μm throughout the length direction. That is, the minimum dimension Wm2min in the width direction of the negative electrode side main pattern 86 is 1400 μm, and the minimum cross-sectional area Sm2min is 98000 μm 2 ². That is, the sum Samin of the minimum cross-sectional areas of each of the plurality of fine line patterns 284a is less than or equal to the minimum cross-sectional area Sm2min of the negative electrode side main pattern 86.

[0071] In this embodiment, the dimension Wn in the width direction of the negative electrode side sub-pattern 85 is 2200 μm throughout the length direction. That is, the minimum dimension Wnmin in the width direction of the negative electrode side main pattern 86 is 2200 μm, and the minimum cross-sectional area Snmin is 154000 μm 2 ². That is, the sum Samin of the minimum cross-sectional areas of each of the plurality of fine line patterns 284a is less than or equal to the minimum cross-sectional area Snmin of the negative electrode side sub-pattern 85. Other configurations of the circuit board 280 of this embodiment are the same as those of the circuit board 80 of the first embodiment.

[0072] According to this embodiment, among a plurality of fine wire patterns 284a, at least the minimum cross-sectional areas S1min and S2min of two fine wire patterns 284a1 and 284a2 are different from each other, and the sum Samin of the minimum cross-sectional areas of each of the plurality of fine wire patterns 284a is equal to or less than the minimum cross-sectional area Smmin of the main pattern 83. In each of the plurality of fine wire patterns 284a and the main pattern 83, when there is a portion where the cross-sectional area is different in the length direction, the resistance of the portion having the minimum cross-sectional area in the length direction becomes the largest. Therefore, when one capacitor 82 is short-circuited and an overcurrent Is flows through the control circuit 290, in each of the plurality of fine wire patterns 284a and the main pattern 83, the temperature rise of the portion having the minimum cross-sectional area becomes the largest. In this embodiment, in the first fine wire pattern 284a1, since the temperature of the second portion 284a12 having a smaller cross-sectional area than other portions becomes higher than that of other portions, the second portion 284a12 melts. Also, in the second fine wire pattern 284a2, since the temperature of the fifth portion 284a22 becomes higher than that of other portions, the fifth portion 284a22 melts. In this embodiment, the cross-sectional area S1min of the second portion 284a12 is smaller than the cross-sectional area S2min of the fifth portion 284a22. Therefore, when an overcurrent Is flows through the control circuit 290, after the second portion 284a12 melts first, the fifth portion 284a22 melts. Further, in this embodiment, since the cross-sectional area S1min of the second portion 284a12 and the cross-sectional area S2min of the fifth portion 284a22 are made small, when an overcurrent Is flows through the control circuit 290, the second portion 284a12 and the fifth portion 284a22 can be melted more quickly. That is, the sub-pattern 84 can be melted more quickly. Therefore, it is possible to protect the electronic component 81 and the like without melting the current fuse 7.

[0073] In addition, in the present embodiment, the sum Samin of the minimum cross-sectional areas of the plurality of fine line patterns 284a is equal to or less than the minimum cross-sectional area Smmin of the main pattern 83. That is, the minimum cross-sectional area Samin of the sub-pattern 284 is equal to or less than the minimum cross-sectional area Smmin of the main pattern 83. Further, the minimum cross-sectional area Samin of the sub-pattern 284 is equal to or less than the minimum cross-sectional area Sm2min of the negative electrode side main pattern 86. Therefore, when an overcurrent Is flows through the control circuit 90, the sub-pattern 84 is blown, so that the blowing of the main pattern 83 and the negative electrode side main pattern 86 can be suppressed. Thus, even if one capacitor 82 is short-circuited, the rotating electric machine 202 and the pump 201 can be continuously driven without replacing the circuit board 280 and the current fuse 7. Therefore, the maintainability of the rotating electric machine 202 and the pump 201 can be improved.

[0074] Note that in the present embodiment, the shape of each fine line pattern 284a is not limited to the present embodiment as long as the sum Samin of the minimum cross-sectional areas of the respective fine line patterns 284a is equal to or less than the minimum cross-sectional area Smmin of the main pattern 83. For example, in the first fine line pattern 284a1, the dimension in the width direction of the third portion 284a13 may be provided to be larger than the dimension in the width direction of the first portion 284a11, or the dimension in the width direction of the first portion 284a11 or the dimension in the width direction of the third portion 284a13 may be provided to be smaller than the dimension in the direction of the second portion 284a12. Also, in the second fine line pattern 284a2, the dimension in the width direction of the sixth portion 284a23 may be provided to be larger than the dimension in the width direction of the fourth portion 284a21, or the dimension in the width direction of the fourth portion 284a21 or the dimension in the width direction of the sixth portion 284a23 may be provided to be smaller than the dimension in the direction of the fifth portion 284a22.

[0075] The present invention is not limited to the above-described embodiment, and other configurations and other methods can also be adopted within the scope of the technical idea of the present invention. For example, the number of circuit layers included in the circuit board may not be four, and may have three or less or five or more circuit layers. Also, the main pattern 83 and the sub-pattern may be provided, for example, in the fourth circuit layer.

[0076] If the DC current supplied by the capacitor module to the power module can be smoothed, the number of capacitors provided on the circuit board is not limited to five, and for example, it may be any number from two or more to four or less. Also, the circuit board may be provided with six or more capacitors.

[0077] When an electronic component is short-circuited, if the sub-pattern can be quickly blown to quickly eliminate the overcurrent flowing through the control circuit and protect other electronic components provided on the circuit board and the motor part, the current fuse may not be provided.

[0078] The application of the circuit board to which the present invention is applied is not particularly limited. The circuit board may be mounted on a device other than a rotating electrical machine. Also, the application of the rotating electrical machine provided with the circuit board to which the present invention is applied is not particularly limited. The rotating electrical machine may be mounted on a device other than a pump. The rotating electrical machine is not limited to a motor and may be a generator. The application of the pump provided with the rotating electrical machine is not particularly limited. The type of fluid pumped by the pump is not particularly limited and may be water or the like. The rotating electrical machine and the pump may be mounted on a device other than a vehicle. In addition, each configuration and each method described in this specification can be appropriately combined within a range that does not conflict with each other.

Explanation of Reference Numerals

[0079] 1,201… Pump, 2,202… Rotating electrical machine, 6… Power supply, 10… Rotor, 60… Pump mechanism, 80a… Wiring pattern, 80b… Circuit layer, 81… Electronic component, 82… Capacitor, 83… Main pattern, 84,284… Sub-pattern, 84a,84a1,84a2,284a,284a1, 284a2… Thin line pattern, J… Central axis

Claims

1. A plurality of electronic components, A wiring pattern provided on a circuit layer, And comprising, The wiring pattern is, A main pattern that electrically connects a plurality of the electronic components and a power source, A sub-pattern that branches from the main pattern and is connected to one of the electronic components, and has, The sub-pattern has a plurality of thin wire patterns, The plurality of thin wire patterns are each connected in parallel to each other between the main pattern and one of the electronic components, Among the plurality of thin wire patterns, at least the cross-sectional areas of two thin wire patterns are different from each other, A circuit board in which the sum of the cross-sectional areas of each of the plurality of thin wire patterns is equal to or less than the cross-sectional area of the main pattern.

2. The sub-pattern has a first thin wire pattern and a second thin wire pattern, The cross-sectional area of the first thin wire pattern is different from the cross-sectional area of the second thin wire pattern, The circuit board according to claim 1, wherein the sub-pattern has a plurality of the first thin wire patterns.

3. The circuit board according to claim 2, wherein the sub-pattern has a plurality of the second thin wire patterns.

4. Among the plurality of thin wire patterns, at least the minimum cross-sectional areas of two thin wire patterns are different from each other, The circuit board according to any one of claims 1 to 3, wherein the sum of the minimum cross-sectional areas of each of the plurality of thin wire patterns is equal to or less than the minimum cross-sectional area of the main pattern.

5. The dimension in the thickness direction of each of the plurality of thin wire patterns is the same as the dimension in the thickness direction of the main pattern, The circuit board according to any one of claims 1 to 4, wherein the dimension in the width direction of each of the plurality of thin wire patterns is different from the dimension in the width direction of the main pattern.

6. The circuit board according to any one of claims 1 to 5, wherein the intervals between the center positions in the width direction of two thin wire patterns arranged adjacent to each other are all the same.

7. The circuit board according to any one of claims 1 to 6, wherein one of the electronic components is a capacitor.

8. Comprising a plurality of capacitors and a plurality of the sub-patterns, The circuit board according to claim 7, wherein the plurality of sub-patterns are each electrically connected to one of the capacitors.

9. A circuit board having a plurality of stacked circuit layers, The circuit board according to any one of claims 1 to 8, wherein the main pattern and the sub-pattern are provided on the outermost stacked circuit layer.

10. A rotor rotatable about a central axis, A stator facing the rotor with a gap therebetween, The circuit board according to any one of claims 1 to 9, Comprising, The circuit board is a rotating electrical machine that controls the current supplied to the stator.

11. The rotating electrical machine according to claim 10, A pump mechanism connected to the rotor, A pump comprising.

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