WO2022097338A1 - Moteur sans balai - Google Patents

Moteur sans balai Download PDF

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Publication number
WO2022097338A1
WO2022097338A1 PCT/JP2021/029566 JP2021029566W WO2022097338A1 WO 2022097338 A1 WO2022097338 A1 WO 2022097338A1 JP 2021029566 W JP2021029566 W JP 2021029566W WO 2022097338 A1 WO2022097338 A1 WO 2022097338A1
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WO
WIPO (PCT)
Prior art keywords
circuit board
brushless motor
dielectric
silicone gel
plate
Prior art date
Application number
PCT/JP2021/029566
Other languages
English (en)
Japanese (ja)
Inventor
隆紘 酒井
翔 中野
Original Assignee
株式会社デンソー
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社デンソー filed Critical 株式会社デンソー
Priority to CN202180075272.6A priority Critical patent/CN116420299A/zh
Publication of WO2022097338A1 publication Critical patent/WO2022097338A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/02—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for suppression of electromagnetic interference
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/30—Structural association with control circuits or drive circuits
    • H02K11/33—Drive circuits, e.g. power electronics
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode

Definitions

  • This disclosure relates to brushless motors.
  • the brushless motor is required to have less electromagnetic noise flowing out of the brushless motor. Therefore, a brushless motor having a structure for suppressing the outflow of electromagnetic noise to the outside of the brushless motor has been proposed.
  • the brushless motor described in Patent Document 1 passes through a rotor housing, a shaft, a bearing, a bearing holder portion, and a conductive portion in order to suppress electromagnetic noise generated from the stator from flowing out to the outside of the brushless motor. It has a first ground path and a second ground path through the rotor housing, shaft, bearings, and conductive parts.
  • a switching element that drives a stator is mounted on the circuit board of a brushless motor. It is known that this switching element generates electromagnetic noise during the switching operation. Therefore, in order to improve the EMC performance of the brushless motor, it is desired to suppress the electromagnetic noise generated from the switching element from flowing out to the outside of the brushless motor.
  • the present disclosure has been made in view of the above problems, and one aspect of the present invention is to provide a brushless motor capable of suppressing electromagnetic noise generated from a switching element from flowing out to the outside of the brushless motor.
  • the purpose is to provide a brushless motor capable of suppressing electromagnetic noise generated from a switching element from flowing out to the outside of the brushless motor.
  • the brushless motor is a brushless motor provided with a noise reduction structure for reducing electromagnetic noise
  • the noise reduction structure has a switching element and an electrolytic capacitor on the first surface. Is connected to the circuit board on which the circuit board is mounted, the conductive member facing the second surface opposite to the first surface of the circuit board, and the cathode terminal of the electrolytic capacitor which is a conductive pattern formed on the circuit board.
  • the conductive connection portion connecting the conductive pattern and the conductive member is interposed between the circuit board and the conductive member in a state of being in contact with the circuit board and the conductive member, and the switching element and the switching element. It has a dielectric arranged at a position where it is electrostatically coupled.
  • FIG. 3 is an arrow view of the circuit board shown in FIG. 1 as viewed from the side of arrow A2 in FIG. It is an arrow view which saw the plate-shaped part of the center piece shown in FIG. 1 from the side of arrow A2 of FIG.
  • FIG. 6 is an arrow view of the plate-shaped portion of the centerpiece in the modified example shown in FIG. 6 as viewed from the side of arrow A2 in FIG.
  • FIG. 1 is a vertical sectional view of a brushless motor 10 according to an embodiment of the present disclosure.
  • the brushless motor 10 according to the embodiment of the present disclosure includes a rotor 12, a stator 14, a shaft 16, a centerpiece 18, a circuit board 20, a board case 22, and a connector member. 24 and.
  • Arrow A1 indicates one side of the brushless motor 10 in the axial direction
  • arrow A2 indicates the other side of the brushless motor 10 in the axial direction.
  • the rotor 12 has a rotor housing 26 and a rotor magnet 28.
  • the rotor housing 26 is formed in a celestial cylindrical shape, and a tubular bearing accommodating portion 30 (inner cylinder portion) is formed in the central portion of the top wall portion of the rotor housing 26.
  • the bearing accommodating portion 30 is located inside the outer cylinder portion of the rotor housing 26 in the radial direction.
  • a pair of bearings 32 are housed in the bearing accommodating portion 30, and the rotor 12 is rotatably supported by the shaft 16 via the pair of bearings 32.
  • the rotor magnet 28 is fixed to the inner peripheral surface of the outer cylinder portion of the rotor housing 26.
  • the rotor housing 26 is provided in an annular shape along the circumferential direction of the rotor 12, and has a configuration in which N poles and S poles are alternately provided in the circumferential direction of the rotor 12.
  • the brushless motor 10 is a so-called outer rotor type, and the rotor magnet 28 is arranged so as to face the stator 14 on the radial outer side of the stator 14, which will be described later.
  • the stator 14 is housed inside the rotor housing 26.
  • the stator 14 is formed in an annular shape as a whole, and is arranged coaxially with the shaft 16.
  • the bearing accommodating portion 30 and the shaft 16 described above are arranged inside the stator 14.
  • the stator 14 has a stator core 34, an insulator 36, and a plurality of windings 38.
  • a plurality of teeth 40 extending radially around the shaft 16 are formed on the stator core 34, and the plurality of windings 38 are wound around the plurality of teeth 40 via the insulator 36.
  • the centerpiece 18 is made of a metal such as iron or aluminum.
  • the centerpiece 18 has a plate-shaped portion 42.
  • the plate-shaped portion 42 is arranged on the other side in the axial direction of the rotor 12 and the stator 14, and faces the opening 44 of the rotor housing 26.
  • the stator 14 is fixed to the plate-shaped portion 42 by screwing or the like, whereby the stator 14 is held by the plate-shaped portion 42.
  • a shaft support portion 46 is formed in the central portion of the plate-shaped portion 42.
  • the shaft support portion 46 is formed in a concave shape that opens toward the stator 14.
  • the shaft 16 is fixed to the shaft support portion 46 in a state of being inserted, whereby the shaft 16 is supported by the shaft support portion 46.
  • the circuit board 20 has a control circuit 48 that drives the stator 14.
  • the control circuit 48 includes electric components such as a plurality of switching elements 50 and a plurality of electrolytic capacitors 52, which will be described later.
  • FIG. 1 shows a part of the plurality of switching elements 50. Further, FIG. 1 shows one of a plurality of electrolytic capacitors 52.
  • the circuit board 20 is arranged on the opposite side of the rotor 12 with respect to the plate-shaped portion 42 so as to face the plate-shaped portion 42.
  • the circuit board 20 is provided along the plate-shaped portion 42.
  • the circuit board 20 is fixed to the plate-shaped portion 42 by a screw 54 or the like.
  • the board case 22 is made of a metal such as iron or aluminum.
  • the board case 22 is fixed to the plate-shaped portion 42 from the side opposite to the rotor 12.
  • the circuit board 20 is housed inside the board case 22.
  • the connector member 24 has a connector case 56 and a connector terminal 58.
  • the connector case 56 is made of resin and is fixed to the plate-shaped portion 42 by screwing or the like.
  • the connector terminal 58 is provided inside the connector case 56.
  • the connector terminal 58 is electrically connected to the control circuit 48 formed on the circuit board 20.
  • the current flowing through the plurality of windings 38 is switched by the switching operation of the plurality of switching elements 50, and the stator 14 forms a rotating magnetic field.
  • the stator 14 forms a rotating magnetic field, an attractive force and a repulsive force are generated between the stator 14 and the rotor magnet 28, whereby the rotor 12 rotates.
  • the brushless motor 10 includes a noise reduction structure 60 that reduces electromagnetic noise.
  • FIG. 2 is a cross-sectional view schematically showing the noise reduction structure 60 of the brushless motor 10 shown in FIG.
  • the noise reduction structure 60 has a conductive connection portion 62, a first silicone gel 64, and a second silicone gel 66 in addition to the circuit board 20 and the plate-shaped portion 42 described above.
  • the plate-shaped portion 42 is an example of a "conductive member”
  • the first silicone gel 64 is an example of a “dielectric” and a “first dielectric”
  • the second silicone gel 66 is a "second dielectric”. Is an example.
  • the circuit board 20 has a first surface 20A and a second surface 20B.
  • the first surface 20A is a surface on one side of the circuit board 20 in the plate thickness direction, and is a surface located on the opposite side to the plate-shaped portion 42.
  • the second surface 20B is a surface on the other side of the circuit board 20 in the plate thickness direction, and is a surface located on the side of the plate-shaped portion 42.
  • FIG. 2 shows one of the plurality of switching elements 50. Similarly, FIG. 2 shows one of a plurality of electrolytic capacitors 52.
  • the plurality of electrolytic capacitors 52 have an anode terminal 52A and a cathode terminal 52B, respectively.
  • a conductive pattern 68 connected to the cathode terminals 52B of a plurality of electrolytic capacitors 52 is formed on the first surface 20A of the circuit board 20.
  • the conductive pattern 68 is shown by an imaginary line (dashed-dotted line).
  • the plate-shaped portion 42 faces the second surface 20B of the circuit board 20.
  • the plate-shaped portion 42 is formed with a boss portion 70 projecting toward the circuit board 20.
  • the boss portion 70 has a screw hole 72.
  • the screw hole 72 is formed along the axial direction of the boss portion 70, and is open to the side of the circuit board 20.
  • the conductive connection portion 62 has the above-mentioned screw 54 and a through hole 74. Both the screw 54 and the through hole 74 are made of metal and have conductivity.
  • the through hole 74 is formed in the circuit board 20 and penetrates in the plate thickness direction of the circuit board 20.
  • the inner peripheral surface of the through hole 74 and the peripheral portions of the openings on both sides of the through hole 74 in the axial direction are formed by a plating layer and are electrically connected to each other.
  • the through hole 74 is located coaxially with the boss portion 70.
  • a screw 54 is inserted inside the through hole 74, and the tip of the screw 54 is screwed into the screw hole 72 of the boss portion 70.
  • the above-mentioned conductive pattern 68 and the plate-shaped portion 42 are electrically connected by the conductive connecting portion 62 having the through hole 74 and the screw 54. That is, the conductive pattern 68 is connected to the peripheral portion of the opening on one side in the axial direction of the through hole 74, and the peripheral portion of the opening on the other side in the axial direction of the through hole 74 is in contact with the top surface of the boss portion 70. Further, the head portion of the screw 54 is in contact with the peripheral portion of the opening on one side in the axial direction of the through hole 74, and the tip portion of the screw 54 is in contact with the inner peripheral surface of the screw hole 72.
  • a plurality of signal lines 76 are connected to the circuit board 20.
  • the plurality of signal lines 76 are connected to the conductive pattern 68 of the circuit board 20 via the connector terminal 58 (see FIG. 1) of the connector member 24 described above.
  • the first silicone gel 64 and the second silicone gel 66 are each formed of a silicone gel.
  • the first silicone gel 64 is interposed between the circuit board 20 and the plate-shaped portion 42 in a state of being in contact with the circuit board 20 and the plate-shaped portion 42.
  • the second silicone gel 66 is interposed between the circuit board 20 and the plate-shaped portion 42 in a state of being in contact with the circuit board 20 and the plate-shaped portion 42.
  • the first silicone gel 64 is arranged at a position corresponding to each of the plurality of switching elements 50, and the second silicone gel 66 is arranged at a position corresponding to each of the plurality of electrolytic capacitors 52. ing.
  • FIG. 3 is an arrow view of the circuit board 20 shown in FIG. 1 as viewed from the arrow A2 side of FIG. As shown in FIG. 3, a plurality of switching elements 50 and a plurality of electrolytic capacitors 52 are distributed and arranged on the first surface 20A of the circuit board 20.
  • the plurality of electrolytic capacitors 52 have an anode terminal 52A and a cathode terminal 52B, respectively.
  • FIG. 4 is an arrow view of the plate-shaped portion 42 of the centerpiece 18 shown in FIG. 1 as viewed from the arrow A2 side of FIG.
  • FIG. 4 shows a state in which the first silicone gel 64 and the second silicone gel 66 are applied to the surface of the plate-shaped portion 42 on the circuit board 20 side.
  • circuit board 20 the plurality of switching elements 50, and the plurality of electrolytic capacitors 52 when the circuit board 20 is assembled to the plate-shaped portion 42 are shown by an imaginary line (dashed-dotted line).
  • the first silicone gel 64 and the second silicone gel 64 and the second silicone gel 66 are assembled.
  • the silicone gel 66 is interposed between the circuit board 20 and the plate-shaped portion 42 in a state of being in contact with the circuit board 20 and the plate-shaped portion 42.
  • the noise reduction structure 60 has a first silicone gel 64 arranged at three locations corresponding to the distribution of a plurality of switching elements 50.
  • first silicone gels 64 arranged at the three locations are distinguished, the first silicone gels 64 arranged at the three locations are referred to as the first silicone gels 64-1 to 3, respectively.
  • the first silicone gel 64-1 and the first silicone gel 64-2 are integrally formed with the second silicone gel 66.
  • the first silicone gel 64-1 is continuously formed with one end of the second silicone gel 66
  • the first silicone gel 64-2 is continuously formed with the other end of the second silicone gel 66. Has been done.
  • the first silicone gel 64-1, 2 and the second silicone gel 66 are all formed linearly.
  • the first silicone gel 64-3 is independent of the first silicone gels 64-1, 2 and the second silicone gel 66, and is formed linearly.
  • the first silicone gel 64-1 is arranged at a position where it is electrostatically coupled to each of the plurality of switching elements 50-1 and 2. Specifically, a part of the first silicone gel 64-1 is arranged at a position where it overlaps with each of the plurality of switching elements 50-1 and 2 in the plan view of the circuit board 20.
  • the plan view of the circuit board 20 corresponds to viewing the circuit board 20 from the arrow A2 side in FIG.
  • the first silicone gel 64-2 is arranged at a position where it is electrostatically coupled to each of the plurality of switching elements 50-3 to 5. Specifically, a part of the first silicone gel 64-2 is arranged at a position where it overlaps with each of the plurality of switching elements 50-3 to 5 in the plan view of the circuit board 20.
  • the first silicone gel 64-3 is arranged at a position where it is electrostatically coupled to a plurality of switching elements 50-6. Specifically, a part of the first silicone gel 64-3 is arranged at a position where it overlaps with a plurality of switching elements 50-6 in a plan view of the circuit board 20.
  • the first silicone gels 64-1 to 3 are arranged at positions overlapping with a part of each of the plurality of switching elements 50-1 to 6, respectively, whereas the first silicone gels 64-1 to 3 are arranged at positions overlapping each other.
  • Each of the plurality of switching elements 50-1 to 6 may be arranged at a position overlapping with all of them.
  • the second silicone gel 66 is arranged at a position where it is electrostatically coupled to each of the plurality of electrolytic capacitors 52. Specifically, a part of the second silicone gel 66 overlaps with each of the cathode terminals 52B of the plurality of electrolytic capacitors 52 in the plan view of the circuit board 20, and all of them are electrolyzed in the plan view of the circuit board 20. It is arranged at a position that does not overlap with the anode terminal 52A of the capacitor 52.
  • a plurality of electrolytic capacitors 52 are arranged in a row and arranged in the same direction with each other.
  • the cathode terminal 52B of the plurality of electrolytic capacitors 52 is located on the opposite side of the plurality of switching elements 50 with respect to the anode terminals 52A of the plurality of electrolytic capacitors 52.
  • the cathode terminals 52B of the plurality of electrolytic capacitors 52 are located on one side B1 of the virtual line L1.
  • a plurality of switching elements 50 are located on the other side B2 of the virtual line L1.
  • the circuit board 20 is fixed to the plate-shaped portion 42 by a plurality of screws 54.
  • the plurality of screws 54 are distinguished, the plurality of screws 54 are referred to as screws 54-1 to 3, respectively.
  • the screws 54-1 and 2 form the above-mentioned conductive connection portion 62, and the screws 54-1 and 2 have a conductive pattern (conducting pattern 68 shown in FIG. 2) (not shown). It is connected to the cathode terminals 52B of the plurality of electrolytic capacitors 52 by (corresponding to).
  • the conductive connection portions 62 corresponding to the screws 54-1 and 2 may be referred to as conductive connection portions 62-1 and 2.
  • the above-mentioned second silicone gel 66 is arranged between the first silicone gels 64-1 to 3 and the conductive connecting portions 62-1 and 2. That is, in the plan view of the circuit board 20, the conductive connection portions 62-1 and 2 are located on one side B1 of the second silicone gel 66 extending linearly, and the conductive connection portions 62-1 and 2 are located on the other side B2 of the second silicone gel 66. The first silicone gels 64-1 to 3 are located.
  • the noise reduction structure 60 includes a first noise propagation path 78 and a second noise propagation path 80 according to the above configuration.
  • the electromagnetic noise of the plurality of switching elements 50 is transmitted from the plurality of switching elements 50 via the first silicone gel 64, the plate-shaped portion 42, the conductive connection portion 62, and the conductive pattern 68, and a plurality of electrolytic capacitors. It is propagated to the cathode terminal 52B of 52.
  • the electromagnetic noise of the plurality of switching elements 50 passes from the plurality of switching elements 50 via the first silicone gel 64, the plate-shaped portion 42, and the second silicone gel 66, and the cathodes of the plurality of electrolytic capacitors 52. It is propagated to the terminal 52B.
  • FIG. 5 is an equivalent circuit diagram of the brushless motor 10 shown in FIG.
  • the inverter circuit 82 is formed by a plurality of switching elements 50 (see FIGS. 3 and 4).
  • the second silicone gel 66 overlaps with the cathode terminals 52B of the plurality of electrolytic capacitors 52 in the plan view of the circuit board 20, and the entire second silicone gel 66 is the plane of the circuit board 20.
  • the second silicone gel 66 and the plurality of electrolytic capacitors 52 are electrostatically coupled. That is, the second silicone gel 66, which is a dielectric, is connected between the conductive pattern 68 on the cathode side to which the cathode terminals 52B of the plurality of electrolytic capacitors 52 are connected and the plate-shaped portion 42.
  • At least a part of the second silicone gel 66 overlaps with the anode terminals 52A of the plurality of electrolytic capacitors 52 in the plan view of the circuit board 20, and all of the second silicone gel 66 overlaps with the plurality of electrolytic capacitors in the plan view of the circuit board 20.
  • the second silicone gel 66 and the plurality of electrolytic capacitors 52 are not electrostatically coupled as shown by an imaginary line (two-point chain line) in FIG. That is, in this case, the second silicone gel 66 is in a state of being connected between the conductive pattern 84 on the anode side to which the anode terminals 52A of the plurality of electrolytic capacitors 52 are connected and the plate-shaped portion 42.
  • the brushless motor 10 includes a noise reduction structure 60 that reduces electromagnetic noise.
  • the noise reduction structure 60 as shown in FIG. 2, the conductive pattern 68 formed on the circuit board 20 is connected to the cathode terminals 52B of the plurality of electrolytic capacitors 52, and the conductive pattern 68 and the plate-shaped portion are connected to each other. It is connected to 42 by a conductive connection portion 62.
  • the first silicone gel 64 is interposed between the circuit board 20 and the plate-shaped portion 42 in a state of being in contact with the circuit board 20 and the plate-shaped portion 42. The first silicone gel 64 is arranged at a position where it is electrostatically coupled to a plurality of switching elements 50.
  • the electromagnetic noise of the plurality of switching elements 50 is transmitted from the plurality of switching elements 50 via the first silicone gel 64, the plate-shaped portion 42, the conductive connection portion 62, and the conductive pattern 68.
  • the first noise propagation path 78 propagated to the cathode terminal 52B of the electrolytic capacitor 52 is formed.
  • the electromagnetic noise of the plurality of switching elements 50 can be absorbed by the plurality of electrolytic capacitors 52, so that the electromagnetic noise generated from the plurality of switching elements 50 flows out to the outside of the brushless motor 10 through, for example, the plurality of signal lines 76. Can be suppressed.
  • the second silicone gel 66 is interposed between the circuit board 20 and the plate-shaped portion 42 in a state where the circuit board 20 and the plate-shaped portion 42 are in contact with each other.
  • the second silicone gel 66 is arranged at a position where it is electrostatically coupled to a plurality of electrolytic capacitors 52.
  • the electromagnetic noise of the plurality of switching elements 50 causes the first silicone gel 64, the plate-shaped portion 42, and the second silicone gel 66 from the plurality of switching elements 50.
  • a second noise propagation path 80 propagated to the cathode terminals 52B of the plurality of electrolytic capacitors 52 via the plurality of electrolytic capacitors 52 is formed.
  • electromagnetic noise can be propagated to the plurality of electrolytic capacitors 52 not only by the first noise propagation path 78 but also by the second noise propagation path 80. Therefore, for example, only the first noise propagation path 78 can be transmitted to the plurality of electrolytic capacitors 52.
  • the absorption efficiency of electromagnetic noise in the plurality of electrolytic capacitors 52 can be improved.
  • first silicone gel 64 is arranged at a position where it overlaps with a plurality of switching elements 50 in a plan view of the circuit board 20.
  • first silicone gel 64 can be appropriately electrostatically coupled to the plurality of switching elements 50.
  • the second silicone gel 66 overlaps with the cathode terminals 52B of the plurality of electrolytic capacitors 52 in the plan view of the circuit board 20, and all of them overlap with the anode terminals of the plurality of electrolytic capacitors 52 in the plan view of the circuit board 20. It is arranged at a position that does not overlap with 52A. As a result, the second silicone gel 66 can be appropriately electrostatically coupled to the plurality of electrolytic capacitors 52.
  • the second silicone gel 66 is arranged between the first silicone gel 64 and the conductive connection portion 62. Therefore, the path length of the second noise propagation path 80 is shorter than the path length of the first noise propagation path 78. Therefore, for example, when the path length of the second noise propagation path 80 is equal to or longer than the path length of the first noise propagation path 78. Compared with a certain case, it is possible to improve the absorption efficiency of electromagnetic noise in a plurality of electrolytic capacitors 52.
  • the first silicone gel 64-1 is formed linearly and overlaps with a plurality of switching elements 50-1, 2 in a plan view of the circuit board 20, and the first silicone gel 64-1 is formed.
  • Reference numeral 2 is formed in a linear shape and overlaps with a plurality of switching elements 50-3 to 5 in a plan view of the circuit board 20. Therefore, for example, the coating process of the first silicone gel 64 can be simplified as compared with the case where the first silicone gel 64 is arranged for each of the plurality of switching elements 50.
  • the second silicone gel 66 is formed linearly and overlaps with the cathode terminals 52B of the plurality of electrolytic capacitors 52 in a plan view of the circuit board 20. Therefore, for example, the coating process of the second silicone gel 66 can be simplified as compared with the case where the second silicone gel 66 is arranged for each of the plurality of electrolytic capacitors 52.
  • the noise reduction structure 60 uses the plate-shaped portion 42 of the center piece 18 as a conductive member for propagating electromagnetic noise. Therefore, for example, the configuration of the noise reduction structure 60 can be simplified as compared with the case of using a dedicated conductive member for propagating electromagnetic noise.
  • FIG. 6 is a diagram showing a modified example of the noise reduction structure 60 shown in FIG. 2, and FIG. 7 shows a plate-shaped portion 42 of the centerpiece 18 in the modified example shown in FIG. 6 from the arrow A2 side of FIG. It is an arrow view that I saw.
  • the first silicone gel 64 and the second silicone gel 66 are used as preferable examples. However, for example, if the first silicone gel 64 is sufficient, the second silicone gel 66 (see FIGS. 2 and 4) may be omitted, as shown in FIGS. 6 and 7.
  • the cathode terminals 52B of the plurality of electrolytic capacitors 52 are located on the opposite sides of the plurality of switching elements 50 with respect to the anode terminals 52A of the plurality of electrolytic capacitors 52, but the cathodes of the plurality of electrolytic capacitors 52.
  • the terminal 52B may be located on the side of the plurality of switching elements 50 with respect to the anode terminals 52A of the plurality of electrolytic capacitors 52.
  • the noise reduction structure 60 is configured to include the plate-shaped portion 42 of the center piece 18, but may be configured to include the substrate case 22 instead of the plate-shaped portion 42.
  • the substrate case 22 corresponds to an example of the “conductive member”.
  • first silicone gel 64 and the second silicone gel 66 which are silicone gels
  • first dielectric and the second dielectric are used as examples of the "first dielectric” and the "second dielectric", but other than the silicone gel.
  • a first dielectric and a second dielectric may be used.
  • the first dielectric and the second dielectric which are dielectric greases, may be used.
  • the arrangement of the plurality of switching elements 50 and the plurality of electrolytic capacitors 52 is an example, and may be other than the above.
  • the arrangement and shape of the first silicone gel 64 and the second silicone gel 66 are examples, and may be other than the above.
  • a part of the first silicone gel 64 is arranged at a position where it overlaps with each of the plurality of switching elements 50 in the plan view of the circuit board 20, but for example, the plurality of first silicone gels. 64 is used, and all of each of the plurality of first silicone gels 64 may overlap with each of the plurality of switching elements 50 in a plan view of the circuit board 20.
  • a part of the second silicone gel 66 is arranged at a position where it overlaps with each of the plurality of electrolytic capacitors 52 in the plan view of the circuit board 20, but for example, a plurality of second silicone gels. 66 is used, and all of each of the plurality of second silicone gels 66 may overlap each of the plurality of electrolytic capacitors 52 in a plan view of the circuit board 20.
  • the first silicone gel 64 is provided corresponding to all the switching elements 50 mounted on the circuit board 20, but all the switching elements mounted on the circuit board 20.
  • the first silicone gel 64 may be provided corresponding to only a part of 50.
  • the second silicone gel 66 is provided corresponding to all the electrolytic capacitors 52 mounted on the circuit board 20, but all the electrolytic capacitors mounted on the circuit board 20 are provided.
  • the second silicone gel 66 may be provided corresponding to only a part of 52.
  • the screw 54 and the through hole 74 are used as an example of the "conductive connection portion", but a configuration other than the screw 54 and the through hole 74 may be used.
  • the noise reduction structure is A circuit board on which a switching element and an electrolytic capacitor are mounted on the first surface, A conductive member facing the second surface opposite to the first surface of the circuit board, A conductive pattern formed on the circuit board, which is connected to the cathode terminal of the electrolytic capacitor, and a conductive connection portion connecting the conductive member.
  • the brushless motor according to Appendix 1 At least a part of the dielectric is arranged at a position where it overlaps with the switching element in a plan view of the circuit board.
  • the brushless motor according to Appendix 1. (Appendix 3)
  • the noise reduction structure is The first dielectric as the dielectric and A second dielectric, which is interposed between the circuit board and the conductive member in a state of being in contact with the circuit board and the conductive member, and is arranged at a position where it is electrostatically coupled to the electrolytic capacitor.
  • At least a part of the second dielectric is arranged at a position where it overlaps with the cathode terminal of the electrolytic capacitor in the plan view of the circuit board, and the whole thereof does not overlap with the anode terminal of the electrolytic capacitor in the plan view of the circuit board.
  • the brushless motor according to Appendix 3. (Appendix 5)
  • the second dielectric is arranged between the first dielectric and the conductive connection.
  • a plurality of the switching elements are mounted on the first surface of the circuit board.
  • the first dielectric is formed in a linear shape and overlaps with a plurality of the switching elements in a plan view of the circuit board.
  • the brushless motor according to any one of Supplementary note 3 to Supplementary note 5. (Appendix 7) A plurality of the electrolytic capacitors are mounted on the first surface of the circuit board. The second dielectric is formed in a linear shape and overlaps with the cathode terminals of the plurality of electrolytic capacitors in a plan view of the circuit board.
  • the brushless motor according to any one of Supplementary note 3 to Supplementary note 6. (Appendix 8) The first dielectric and the second dielectric are integrally formed.
  • the brushless motor according to any one of Supplementary note 3 to Supplementary note 7. (Appendix 9) The first dielectric and the second dielectric are silicone gels.
  • the cathode terminal of the electrolytic capacitor is located on the opposite side of the switching element with respect to the anode terminal of the electrolytic capacitor.
  • the brushless motor according to any one of Supplementary note 1 to Supplementary note 9. (Appendix 11)
  • the cathode terminal of the electrolytic capacitor is located on the side of the switching element with respect to the anode terminal of the electrolytic capacitor.
  • the brushless motor is With a rotor having a topped cylinder-shaped rotor housing, The stator housed inside the rotor housing and A centerpiece having a plate-like portion facing the opening of the rotor housing and holding the stator, Equipped with The circuit board is arranged on the opposite side of the plate-shaped portion from the rotor so as to face the plate-shaped portion.
  • the conductive member is the plate-shaped portion.
  • the brushless motor is With a rotor having a topped cylinder-shaped rotor housing, The stator housed inside the rotor housing and A centerpiece having a plate-like portion facing the opening of the rotor housing and holding the stator, Equipped with The circuit board is arranged on the opposite side of the plate-shaped portion from the rotor so as to face the plate-shaped portion.
  • the conductive member is a substrate case for accommodating the circuit board.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Inverter Devices (AREA)

Abstract

La présente invention concerne une structure de réduction de bruit d'un moteur sans balai qui comprend : une carte de circuit imprimé montée avec un élément de commutation et un condensateur électrolytique sur une première surface ; un élément conducteur faisant face à une seconde surface sur le côté en regard de la première surface de la carte de circuit imprimé ; une portion de connexion conductrice pour connecter un tracé conducteur et l'élément conducteur l'un à l'autre, ledit tracé conducteur étant formé sur la carte de circuit imprimé et connecté à la borne de cathode du condensateur électrolytique ; et un corps diélectrique interposé entre la carte de circuit imprimé et l'élément conducteur dans un état de contact avec la carte de circuit imprimé et l'élément conducteur et disposé dans une position dans laquelle le corps diélectrique est connecté électrostatiquement à l'élément de commutation.
PCT/JP2021/029566 2020-11-09 2021-08-10 Moteur sans balai WO2022097338A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202180075272.6A CN116420299A (zh) 2020-11-09 2021-08-10 无刷电动机

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JP2020-186784 2020-11-09
JP2020186784A JP7484670B2 (ja) 2020-11-09 2020-11-09 ブラシレスモータ

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WO2022097338A1 true WO2022097338A1 (fr) 2022-05-12

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JP (1) JP7484670B2 (fr)
CN (1) CN116420299A (fr)
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012135213A (ja) * 2012-04-13 2012-07-12 Mitsubishi Electric Corp ブラシレスｄｃモーター、及び機器
JP2020072500A (ja) * 2018-10-29 2020-05-07 株式会社デンソー 回転電機

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012135213A (ja) * 2012-04-13 2012-07-12 Mitsubishi Electric Corp ブラシレスｄｃモーター、及び機器
JP2020072500A (ja) * 2018-10-29 2020-05-07 株式会社デンソー 回転電機

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CN116420299A (zh) 2023-07-11
JP2022076387A (ja) 2022-05-19
JP7484670B2 (ja) 2024-05-16

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