WO2021044853A1 - モータ - Google Patents

モータ Download PDF

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Publication number
WO2021044853A1
WO2021044853A1 PCT/JP2020/031402 JP2020031402W WO2021044853A1 WO 2021044853 A1 WO2021044853 A1 WO 2021044853A1 JP 2020031402 W JP2020031402 W JP 2020031402W WO 2021044853 A1 WO2021044853 A1 WO 2021044853A1
Authority
WO
WIPO (PCT)
Prior art keywords
outer frame
stator
winding
motor
motor according
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2020/031402
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
野田　伸一
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nidec Corp
Original Assignee
Nidec Corp
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 Nidec Corp filed Critical Nidec Corp
Priority to EP20861718.3A priority Critical patent/EP4027496A4/en
Priority to US17/639,389 priority patent/US20220337120A1/en
Priority to JP2020571873A priority patent/JPWO2021044853A1/ja
Priority to CN202080061770.0A priority patent/CN114365396A/zh
Publication of WO2021044853A1 publication Critical patent/WO2021044853A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/24—Casings; Enclosures; Supports specially adapted for suppression or reduction of noise or vibrations
    • 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
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/46—Fastening of windings on the stator or rotor structure
    • H02K3/50—Fastening of winding heads, equalising connectors, or connections thereto
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/22—Auxiliary parts of casings not covered by groups H02K5/06-H02K5/20, e.g. shaped to form connection boxes or terminal boxes
    • H02K5/225—Terminal boxes or connection arrangements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information

Definitions

  • the present invention relates to a motor.
  • an electromagnetic force acts between the stator core and the rotor core, causing the frame to vibrate.
  • the electromagnetic force works to narrow the gap, and the stator core is pulled inward, causing the core to deform.
  • the mode order of the electromagnetic force is low, the frame is easily deformed, which causes vibration.
  • the frequency of the electromagnetic force matches or is close to the natural frequency of the frame depending on the operating conditions, large vibration and noise are generated.
  • a motor with a small number of poles generates a low-order electromagnetic force mode, so vibration and noise are likely to occur.
  • the part where the coil is firmly fixed inside the iron core slot and the part where the coil protrudes with a cantilever support structure. And exists.
  • the part of the cantilever support structure is the part of the crossover where the coil crosses between the iron core slots. Such a crossover may cause a short circuit or the like due to vibration.
  • Patent Document 1 proposes a technique in which an insulating ring is arranged on the outer peripheral side of a crossover and a holding plate is arranged on the inner peripheral side, and these are firmly integrated and fixed by bolts or binding strings.
  • an object of the present invention is to protect the crossover based on the vibration mode.
  • One aspect of the motor according to the present invention is an outer frame extending in a tubular shape, a stator fixed in the outer frame, each of which is integrally formed with the outer frame and has a wall shape from the outer surface of the outer frame.
  • a plurality of wall portions extending in the direction in which the outer frame extends, a connecting portion in which the plurality of wall portions are connected to each other to form an integrated projecting body, and the stator are distributed and wound around the stator to be fixed.
  • a winding is provided at the center of the protruding body with a crossover straddling the nearest portion.
  • another aspect of the motor according to the present invention is an outer frame having an inner peripheral surface extending in a cylindrical shape, an annular stator fitted in the outer frame, and a distributed winding around the stator. It is provided with a winding in which a crossing line straddles a section closest to the elliptical vibration node generated in the outer frame of the entire circumference of the stator.
  • the crossover can be protected based on the vibration mode.
  • FIG. 1 is a cross-sectional view schematically showing the configuration of the motor of the present embodiment.
  • FIG. 2 is a vertical cross-sectional view schematically showing the configuration of the motor of the present embodiment.
  • FIG. 3 is a diagram schematically showing the structure of the stator.
  • FIG. 4 is a diagram showing an 8-pole stator.
  • FIG. 5 is a perspective view showing the structure of the winding of the distributed winding.
  • FIG. 6 is a diagram showing an example of a crossover of each phase of UVW.
  • FIG. 7 is a diagram showing vibration generated in the motor.
  • FIG. 8 is a diagram showing a modified example provided with a storage box.
  • FIG. 9 is a diagram showing another modified example provided with a storage box.
  • FIG. 1 is a cross-sectional view schematically showing the configuration of the motor of the present embodiment.
  • FIG. 2 is a vertical cross-sectional view schematically showing the configuration of the motor of the present embodiment.
  • FIG. 3 is a diagram schematically
  • FIG. 10 is a diagram showing a modified example provided with a leg portion.
  • FIG. 11 is a diagram showing vibration of a motor in a modified example provided with legs.
  • FIG. 12 is a diagram showing another modified example including the legs.
  • FIG. 13 is a diagram showing a modified example including both the terminal block and the leg portion.
  • FIG. 1 and 2 are diagrams schematically showing the configuration of the motor of the present embodiment.
  • FIG. 1 is a cross-sectional view showing a cross section perpendicular to the rotation axis of the motor
  • FIG. 2 is a vertical cross-sectional view showing a cross section parallel to the rotation axis of the motor.
  • the motor 100 includes a rotor 110, which is also called a rotor, a stator 120, which is also called a stator, and an outer frame 130 that extends in a tubular shape.
  • the stator 120 is fixed in the outer frame 130.
  • the rotor 110 is inserted inside the stator 120 and rotates inside the stator 120 about the rotation shaft 112.
  • the stator 120 generates a rotating magnetic field
  • the rotor 110 includes a rotating shaft 112, which is also called a shaft, and a rotor core 111 fixed to the rotating shaft 112, and is incorporated in the rotor core 111. It may be equipped with omitted magnets and windings.
  • the rotor core 111 is also called a rotor core and is generally made of a magnetic material containing iron.
  • the rotor 110 receives stress from the rotating magnetic field and rotates about the rotation shaft 112.
  • the stator 120 is provided with a winding described later, and the generally cylindrical outer frame 130 has a terminal block 131 for pulling out and fixing the end portion 140 of the winding to the outside of the outer frame 130. It is provided in a part of.
  • an auxiliary winding used only at the start of driving of the motor 100 may be used, but the winding described below in the present specification is a main winding with respect to the auxiliary winding. It is a winding used when the motor 100 is normally driven, which is also called a wire.
  • the terminal block 131 has a box shape and has a vertical wall 132 extending parallel to the rotation axis of the motor and a horizontal wall 133 extending perpendicular to the rotation axis of the motor.
  • the terminal block 131 is integrated with the outer frame 130, and the portion of the outer frame 130 where the terminal block 131 is provided has higher rigidity than the other portions.
  • Each of the vertical walls 132 is formed integrally with the outer frame 130, projects like a wall from the outer surface of the outer frame 130, and extends in the direction in which the outer frame 130 extends, as an example of a plurality of wall portions according to the present invention. Equivalent to.
  • the side wall 133 corresponds to an example of the connecting portion according to the present invention, in which a plurality of wall portions are connected to each other to form an integral projecting body.
  • the lateral wall 133 projects in a wall shape from the outer surface of the outer frame 130 and extends in the direction of orbiting the outer frame 130.
  • the terminal block 131 corresponds to an example of the projecting body according to the present invention, and also forms an example of the drawing portion according to the present invention, in which the end portion of the winding is pulled out to the outside of the outer frame 130.
  • FIG. 3 is a diagram schematically showing the structure of the stator.
  • the stator 120 has a stator core 121 and a winding 122.
  • the stator core 121 is also referred to as a core and is generally made of a magnetic material containing iron.
  • the stator core 121 has an annular return portion 123, a tooth portion 124 protruding inward from the return portion 123 (that is, a direction toward the rotor 110), and a slot extending between the tooth portions 124. It has a groove portion 125 referred to as a groove portion 125.
  • FIG. 3 shows an example having, for example, 24 slots.
  • the tooth portions 124 and the groove portions 125 extend parallel to the rotation axis of the motor 100 (that is, in the direction perpendicular to the paper surface of FIG. 3).
  • the winding 122 passes through the groove 125 and extends in the direction perpendicular to the paper surface of FIG. 3 over the entire length of the groove 125.
  • the direction through which the winding 122 passes is indicated by a symbol in FIG.
  • FIG. 3 shows the direction of, for example, the U-phase winding 122 among the windings 122 of each UVW phase.
  • the winding 122 located in the vertical direction of the figure passes through the groove 125 toward the front side of the figure, and the winding 122 located in the left-right direction of the figure has a groove toward the back side of the figure. It passes through 125.
  • the windings 122 that have passed through the groove 125 in this way are connected to each other outside the groove 125.
  • the winding 122 located on the upper side of the figure is connected to the winding 122 located on the left side of the figure, and the winding 122 located on the lower side of the figure is connected to the winding 122 located on the right side of the figure.
  • the upper left and lower right of the figure are inner portions surrounded by the winding 122. Since the plurality of tooth portions 124 exist in the range surrounded by the winding 122, the winding 122 is a distributed winding.
  • a current flows through the connected windings 122, for example, in the same direction as the windings 122 pass through.
  • the magnetic field lines are directed toward the inside of the stator 120 at the upper left and lower right of the figure, so that the upper left and lower right of the figure are the north poles when viewed from the rotor 110.
  • the magnetic field lines are directed toward the outside of the stator 120 in the upper right and lower left of the figure, the upper right and lower left of the figure are S poles when viewed from the rotor 110. That is, in the example shown in FIG.
  • FIG. 4 is a diagram showing an 8-pole stator 120. Also in FIG. 4, the direction is shown for, for example, the U-phase winding 122 among the windings 122 of each UVW phase.
  • the winding 122 faces the front side of the figure at four places on the top, bottom, left and right of the figure, and moves to the back side of the figure at four places of the upper left, lower left, upper right and lower right of the figure. Head.
  • the winding 122 located on the upper left side of the figure is connected to the winding 122 located on the upper left side of the figure, and the winding 122 located on the left side of the figure is connected to the winding 122 located on the lower left side of the figure.
  • the other windings 122 are similarly connected, resulting in lines of magnetic force, for example as indicated by the dotted arrows in the figure.
  • FIG. 5 is a perspective view showing the structure of the distributed winding winding 122.
  • the winding 122 is passed through the groove 125 of the stator core 121, and the groove 125 and the winding 122 are insulated by the insulating paper 126.
  • the winding 122 extending from the groove 125 to the other groove 125 straddles the plurality of tooth portions 124, and the plurality of windings 122 are bundled to form a crossover line 150.
  • the crossover 150 shown in FIG. 5 is, for example, the crossover 150 in the U-phase winding 122 among the windings 122 of each UVW phase.
  • the crossover line 150 protrudes from the stator core 121. Further, since the crossover line 150 itself constitutes a part of the winding 122, a rotating magnetic field is generated. As a result, the crossover line 150 may vibrate with respect to the stator core 121 due to the stress caused by the rotating magnetic field. In order to suppress such vibration, the crossover lines 150 are tightly bundled. Further, the stator 120 has a crossover 150 for the winding 122 of each phase of UVW, and those windings are also bundled.
  • FIG. 6 is a diagram showing an example of a crossover line 150 for each phase of UVW. In FIG. 6, the crossover 150 of each UVW phase is shown with different hatching for each phase.
  • the crossover line 150 overlaps each other in each UVW phase in the entire circumference of the stator core 121, and a portion where the crossover line 150 in any phase does not straddle the tooth portion 124.
  • the crossover lines 150 that overlap each other are bundled by a fixture or the like and fixed to each other to suppress vibration. In the example shown in FIG. 6, the crossover 150 is grouped into four bundles.
  • FIG. 7 is a diagram showing vibration generated in the motor 100.
  • stator 120 and the rotor 110 are not shown.
  • the illustration of the outer frame 130 and the crossover line 150 represents a tubular structure in which the stator 120 and the outer frame 130 are combined.
  • the vibration mode with a high load on the crossover 150 is the elliptical vibration mode.
  • the elliptical vibration mode is shown by a dotted line.
  • the X-axis and Y-axis are also shown for convenience of explaining the position.
  • the intersection (that is, the origin) of the X-axis and the Y-axis is the center of rotation of the motor.
  • a terminal block 131 is formed at a portion of the outer frame 130 that intersects the Y axis, and the X axis extends in parallel with the terminal block 131.
  • the structure in which the stator 120 and the outer frame 130 are combined has a tubular shape, but since the terminal block 131 is present in a part of the outer frame 130, only a part of the structure has high rigidity, and the section of the elliptical vibration mode has a high rigidity.
  • the position is fixed near the center of the highly rigid terminal block 131. That is, the terminal block 131 corresponds to an example of a rigidity increasing portion for fixing the elliptical vibration mode node generated in the outer frame 130 by being provided on a part of the outer frame 130 and increasing the rigidity of the part.
  • the elliptical vibration mode vibrates significantly in the intermediate direction between the X-axis and the Y-axis, and a node of the elliptical vibration mode is generated on the axes of the X-axis and the Y-axis.
  • the terminal block 131 is used as a means for increasing the rigidity of the outer frame 130, it is not necessary to separately provide a reinforcing material or the like. As a result, the cost of the motor is reduced and the size of the motor is also reduced. Further, the number of parts of the motor is suppressed, which contributes to the improvement of the assembleability of the motor.
  • the terminal block 131 is integrated with the outer frame 130.
  • “Integration” means that it is formed as a seamless integral body by casting or the like, or is firmly integrated by welding or the like, and does not include screwing or the like.
  • the terminal block 131 may extend over 80 degrees in the direction of orbiting the outer frame 130 when viewed from the rotation center which is the origin of the XY coordinates. It is desirable, and more preferably over 90 degrees.
  • the rigidity of the terminal block 131 increases as compared with the case where the vertical wall 132 protrudes in different directions, and the elliptical vibration mode node Is properly fixed.
  • the terminal block 131 has a length equal to or longer than the stator core 121 (that is, the vertical wall 132 is fixed). It is desirable to have a child core 121 or more in length). By having such a length in the terminal block 131, the nodes of the elliptical vibration mode are more appropriately fixed.
  • the highest point of the outer frame 130 in that direction (that is, the outer surface of the outer frame 130 protrudes most in the direction within the range of the terminal block 131). It is desirable that the thickness d of the outer frame 130 is at least twice as high as the thickness d of the outer frame 130.
  • the vertical wall 132 has such a height T, sufficient rigidity is generated in the terminal block 131, and the nodes of the elliptical vibration mode are more appropriately fixed.
  • the terminal block 131 has a box shape having a vertical wall 132 extending parallel to the rotation axis of the motor and a horizontal wall 133 extending perpendicularly to the rotation axis of the motor. , The terminal block 131 effectively improves the rigidity of the outer frame 130. As a result, the terminal block 131 properly fixes the elliptical vibration mode nodes.
  • the crossover 150 is fixed in the direction in which the central part is located at the node in the elliptical vibration mode. That is, the stator 120 is fixed to the outer frame 130 so that the crossover line 150 is in such a position.
  • the winding 122 (see FIG. 3 etc.) wound around the stator 120 in a distributed manner crosses the most recent portion of the entire circumference of the stator core 121 to the center of the terminal block 131 corresponding to the projecting body.
  • Line 150 straddles. It can be said that the crossover line 150 straddles the section closest to the node of the elliptical vibration mode.
  • the vibration-resistant end portion of the crossover line 150 is located at the abdomen where the vibration in the elliptical vibration mode is small and the vibration in the elliptical vibration mode is large. Therefore, the crossover 150 is efficiently protected from the vibration of the motor 100, and damage to the crossover 150 is suppressed.
  • the crossover line 150 shown in FIG. 7 is a bundle of crossover wires of each UVW phase, but for each winding of each UVW phase, a portion closest to the center of the terminal block 131 is crossed. Line 150 straddles. With this structure, each crossover 150 is protected more efficiently and damage to the crossover 150 is suppressed. (Modification example)
  • FIG. 8 is a diagram showing a modified example provided with a storage box.
  • a housing box 136 of the inverter 135 that supplies a current to the motor is provided on the outer frame 130 as an example of the projecting body according to the present invention, instead of the terminal block 131.
  • the inverter 135 is mounted in the housing box 136, and the housing box 136 corresponds to an example of the inverter mounting portion according to the present invention.
  • the storage box 136 shown in FIG. 8 also has a box shape, and the outer frame 130 and the storage box 136 are integrated.
  • the outer frame 130 is partially stiffened by the accommodating box 136, and the position of the node in the elliptical vibration mode is fixed near the center of the accommodating box 136.
  • FIG. 9 is a diagram showing another modified example provided with a storage box.
  • FIG. 10 is a diagram showing a modified example provided with a leg portion.
  • the leg portion 137 that supports the outer frame 130 of the motor 100 is provided integrally with the outer frame 130.
  • the leg portion 137 has two projecting plate portions 138 protruding vertically downward from the outer peripheral surface of the outer frame 130, and a horizontal plate portion 139 that connects the projecting plate portions 138 to each other and extends in the horizontal direction.
  • the protruding plate portion 138 extends in a direction along the rotation axis of the motor 100.
  • the horizontal plate portion 139 is welded to the outer surface of the outer frame 130 between the two protruding plate portions 138 to firmly integrate the leg portion 137 and the outer frame 130.
  • Each of the projecting plate portions 138 is integrally formed with the outer frame 130, projects like a wall from the outer surface of the outer frame 130, and extends in the direction in which the outer frame 130 extends, which is an example of a plurality of wall portions according to the present invention.
  • the horizontal plate portion 139 corresponds to an example of the connecting portion referred to in the present invention in which a plurality of wall portions are connected to each other to form an integral protruding body.
  • the leg portion 137 corresponds to an example of the projecting body according to the present invention. In the example shown here, the horizontal plate portion 139 extends toward the outer surface of the outer frame 130 and is integrally connected to the outer frame 130 at the central portion of the projecting body according to the present invention.
  • FIG. 11 is a diagram showing vibration of the motor 100 in a modified example provided with legs.
  • the elliptical vibration mode vibrates greatly in the intermediate direction between the X-axis and the Y-axis, and X Elliptical vibration mode nodes occur on the axes of the axis and the Y axis.
  • the two projecting plate portions 138 project in the same direction from each other, so that the rigidity of the leg portion 137 is efficiently improved and the node of the elliptical vibration mode is appropriately fixed.
  • FIG. 12 is a diagram showing another modified example including the legs.
  • FIG. 13 is a diagram showing a modified example including both the terminal block and the leg portion.
  • the terminal block 131 is formed with respect to the outer frame 130, and the leg portion 137 is formed on the side opposite to the terminal block 131 with the outer frame 130 interposed therebetween.
  • the first projecting body forming the leg portion 137 and the second projecting body located on the opposite side of the outer frame 130 with respect to the first projecting body.
  • the terminal block 131 corresponds to an example of the second projecting body.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Motor Or Generator Frames (AREA)
PCT/JP2020/031402 2019-09-03 2020-08-20 モータ Ceased WO2021044853A1 (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP20861718.3A EP4027496A4 (en) 2019-09-03 2020-08-20 ENGINE
US17/639,389 US20220337120A1 (en) 2019-09-03 2020-08-20 Motor
JP2020571873A JPWO2021044853A1 (https=) 2019-09-03 2020-08-20
CN202080061770.0A CN114365396A (zh) 2019-09-03 2020-08-20 马达

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019160618 2019-09-03
JP2019-160618 2019-09-03

Publications (1)

Publication Number Publication Date
WO2021044853A1 true WO2021044853A1 (ja) 2021-03-11

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2020/031402 Ceased WO2021044853A1 (ja) 2019-09-03 2020-08-20 モータ

Country Status (5)

Country Link
US (1) US20220337120A1 (https=)
EP (1) EP4027496A4 (https=)
JP (1) JPWO2021044853A1 (https=)
CN (1) CN114365396A (https=)
WO (1) WO2021044853A1 (https=)

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KR102931647B1 (ko) 2025-10-29 2026-02-26 효성전기주식회사 다중권선형 조향 모터 시스템의 제어 방법

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EP4027496A4 (en) 2024-02-14

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