WO2018180343A1 - Stator de moteur électrique et moteur électrique - Google Patents

Stator de moteur électrique et moteur électrique Download PDF

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Publication number
WO2018180343A1
WO2018180343A1 PCT/JP2018/009034 JP2018009034W WO2018180343A1 WO 2018180343 A1 WO2018180343 A1 WO 2018180343A1 JP 2018009034 W JP2018009034 W JP 2018009034W WO 2018180343 A1 WO2018180343 A1 WO 2018180343A1
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WO
WIPO (PCT)
Prior art keywords
annular core
laminated
stator
teeth
phase
Prior art date
Application number
PCT/JP2018/009034
Other languages
English (en)
Japanese (ja)
Inventor
俊輔 村上
英博 芳賀
智哉 上田
Original Assignee
日本電産株式会社
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 日本電産株式会社 filed Critical 日本電産株式会社
Priority to JP2019509137A priority Critical patent/JP7147745B2/ja
Priority to CN201880020831.1A priority patent/CN110462979A/zh
Publication of WO2018180343A1 publication Critical patent/WO2018180343A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/16—Stator cores with slots for windings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures

Definitions

  • the present disclosure relates to an electric motor stator and an electric motor.
  • a motor for an electric power steering apparatus is further required to reduce vibrations in order to improve steering feeling.
  • a technique is known that attempts to reduce the vibration of the motor by increasing the rigidity of the stator.
  • Patent Document 1 discloses an annular stator including a tooth iron core in which a plurality of iron core members are stacked, and an annular yoke iron core fitted to the outer periphery of the tooth iron core.
  • Each iron core member has a plurality of tooth portions and a bridging portion that connects the tips of two adjacent tooth portions of the plurality of tooth portions.
  • a stator manufacturing method a plurality of iron core members are formed by punching a steel plate.
  • a tooth core is obtained by rotating and laminating a plurality of iron core members by a certain angle for each sheet. After the winding is attached from the outer peripheral side of the tooth core, the stator is obtained by press-fitting the tooth core into the inner peripheral portion of the yoke core. According to the stator structure, magnetic flux leakage is reduced while the mechanical strength of the stator is improved by the bridge portion.
  • the embodiment of the present disclosure provides a stator capable of reducing motor vibration.
  • An exemplary stator for a motor of the present disclosure includes a laminated body in which a plurality of annular core sheets are laminated, a plurality of laminated teeth, and a plurality of windings attached to the plurality of laminated teeth.
  • Each of the core sheets is connected to an annular core back, a plurality of teeth arranged at equal intervals on the inner periphery of the core back, and protruding toward the center of the core back, and the tips of two adjacent teeth.
  • a connecting portion including a joint.
  • a stator capable of reducing motor vibration is provided.
  • FIG. 1 is a cross-sectional view along the central axis 500 showing an exemplary structure of the motor 100.
  • FIG. 2 is a perspective view of the laminate 210.
  • FIG. 3 is a plan view of the stator 200 in a state where the windings 220 are attached to the multilayer body 210 as viewed from the stacking direction of the multilayer body 210.
  • FIG. 4 is a plan view of the annular core sheet 230 constituting the stacked body 210 as viewed from the stacking direction of the stacked body 210.
  • FIG. 5A is a schematic diagram showing a pair of adjacent two laminated teeth 212 in an enlarged manner.
  • FIG. 5B is an enlarged schematic view showing one of a plurality of connecting portions 233 between a pair of adjacent two stacked teeth 212.
  • FIG. 6 is a development view of the laminated body 210 obtained by cutting the laminated core back 211 located between a pair of laminated teeth 212 in the y direction and developing the laminated body 210 in the x direction.
  • FIG. 7 is a flowchart showing a flow of a method for manufacturing the motor 100 and the stator 200.
  • FIG. 8A is a schematic view showing a state where a plurality of annular core sheets 230 are formed by punching the electromagnetic steel sheet 700 in an annular shape using a mold 800.
  • FIG. 8B is a schematic diagram showing a plurality of annular core sheets 230 formed by stamping.
  • FIG. 9 is a schematic diagram showing a state in which the connecting portion 233 is cut using the cutting blade 710.
  • FIG. 10 is a schematic view showing a state in which a plurality of annular core sheets 230 are stacked by rotating each of the annular core sheets 230 by a predetermined angle in the circumferential direction.
  • FIG. 11A is a schematic diagram showing how the laminated annular core 210 is divided into 12 divided cores 250.
  • FIG. 11B is a schematic diagram showing how the jig 900 is inserted into the slot 214 to divide the laminated annular core 210.
  • FIG. 11C is a plan view of the twelve divided cores 250 as seen from the stacking direction of the stacked annular cores 210.
  • FIG. 12A is a plan view of the split core 250 to which the winding 220 is attached.
  • FIG. 12B is a perspective view of the split core 250 in which the winding 220 is attached to the laminated tooth 212.
  • FIG. 13 is a schematic diagram showing a state in which the laminated annular core 210 divided into a plurality of divided cores 250 is returned to an annular shape using a jig.
  • FIG. 14 is a schematic diagram showing how the cut surfaces of the connecting portion 233 are brought into contact with each other during reassembly.
  • FIG. 15 is a plan view illustrating an example of the stator 200 and the rotor 300 included in the motor 100.
  • FIG. 16 is a plan view showing an example of the stator 200.
  • FIG. 17 is a diagram illustrating a position where the connecting portion 233 in the stator 200 is disposed.
  • FIG. 18 is a diagram illustrating another example of a position where the connecting portion 233 in the stator 200 is disposed.
  • FIG. 19 is a diagram showing still another example of a position where the connecting portion 233 in the stator 200 is arranged.
  • FIG. 20 is a diagram illustrating still another example of the position where the coupling portion 233 in the stator 200 is disposed.
  • FIG. 21 is a diagram showing a simulation result of the operation of the motor 100 having the stator structure shown in FIGS.
  • FIG. 1 is a cross-sectional view along the central axis 500 showing an exemplary structure of the motor 100.
  • the motor 100 is a so-called inner rotor type motor.
  • the motor 100 is mounted on, for example, an automobile and is suitably used as a motor for an electric power steering device. In that case, the motor 100 generates the driving force of the electric power steering apparatus.
  • the motor 100 includes a stator 200, a rotor 300, a housing 400, a lid 420, a lower bearing 430, and an upper bearing 440.
  • the stator 200 is also referred to as an armature.
  • the housing 400 is a substantially cylindrical casing having a bottom, and houses the stator 200, the lower bearing 430, and the rotor 300 therein.
  • a recess 410 that holds the lower bearing 430 is in the center of the bottom of the housing 400.
  • the lid 420 is a plate-like member that closes the opening at the top of the housing 400.
  • a circular hole 421 that holds the upper bearing 440 is in the center of the lid portion 420.
  • the stator 200 is annular and has a laminated body (sometimes referred to as a “laminated annular core”) 210 and a winding (sometimes referred to as a “coil”) 220.
  • the stator 200 generates a magnetic flux according to the drive current.
  • the laminated body 210 is composed of a laminated steel plate in which a plurality of steel plates are laminated in a direction along the central axis 500 (y direction in FIG. 1), and includes an annular laminated core back 211 and a plurality of laminated teeth (teeth) 212.
  • the laminated core back 211 is fixed to the inner wall of the housing 400.
  • the structure of the stator 200 will be described in detail later.
  • the central axis 500 is a rotation axis of the rotor 300.
  • the winding 220 is constituted by a conductive wire (generally a copper wire), and is typically attached to each of the plurality of laminated teeth 212 of the laminated body 210.
  • the lower bearing 430 and the upper bearing 440 are mechanisms that rotatably support the shaft 340 of the rotor 300.
  • ball bearings that relatively rotate an outer ring and an inner ring via a sphere can be used.
  • FIG. 1 shows a ball bearing.
  • the outer ring 431 of the lower bearing 430 is fixed to the recess 410 of the housing 400.
  • the outer ring 441 of the upper bearing 440 is fixed to the edge of the circular hole 421 of the lid part 420.
  • the inner rings 432 and 442 of the lower bearing 430 and the upper bearing 440 are fixed to the shaft 340. For this reason, the shaft 340 is rotatably supported with respect to the housing 400 and the lid 420.
  • the rotor 300 includes rotor units 310 and 320, a shaft 340, and a cover 350.
  • the shaft 340 is a substantially cylindrical member that extends in the vertical direction along the central axis 500.
  • the shaft 340 is rotatably supported by the lower bearing 430 and the upper bearing 440 and can rotate about the central axis 500.
  • the shaft 340 has a head 341 at the tip on the lid 420 side.
  • the head 341 is connected to a power transmission mechanism such as a gear that transmits a driving force to an electric power steering device of an automobile, for example.
  • the rotor units 310 and 320 and the cover 350 rotate together with the shaft 340 in the internal space in the radial direction of the stator 200.
  • Each of the rotor units 310 and 320 includes a rotor core 331, a magnet holder 332, and a plurality of magnets 333.
  • the rotor units 310 and 320 are arranged along the central axis 500 in a state where the upper and lower sides are reversed.
  • the plurality of magnets 333 are arranged at substantially equal intervals along the circumferential direction of the rotor 300.
  • the cover 350 is a substantially cylindrical member that holds the rotor units 310 and 320.
  • the cover 350 covers the outer peripheral surfaces of the rotor units 310 and 320 and part of the upper and lower end surfaces. As a result, the rotor units 310 and 320 are held in a state of being close to or in contact with each other.
  • the motor 100 when a drive current is passed through the winding 220 of the stator 200, radial magnetic flux is generated in the plurality of laminated teeth 212 of the laminated body 210. Torque is generated in the circumferential direction by the action of magnetic flux between the plurality of laminated teeth 212 and the magnet 333, and the rotor 300 rotates about the central axis 500 with respect to the stator 200. When the rotor 300 rotates, for example, a driving force is generated in the electric power steering device.
  • stator 200 Next, the structure of the stator 200 according to the present embodiment will be described in detail with reference to FIGS.
  • the stator 200 according to the embodiment of the present disclosure may have M (M is an integer of 2 or more) teeth (in other words, M slots).
  • M is an integer of 2 or more teeth
  • M slots the structure of the stator 200 having 12 teeth (12 slots) will be described.
  • FIG. 2 is a perspective view of the laminate 210.
  • FIG. 3 is a plan view of the stator 200 in a state where the windings 220 are attached to the multilayer body 210 as viewed from the stacking direction of the multilayer body 210.
  • FIG. 4 is a plan view of the annular core sheet 230 constituting the stacked body 210 as viewed from the stacking direction of the stacked body 210.
  • the stator 200 includes a laminate 210 and a winding 220.
  • the laminated body 210 has 12 laminated teeth 212 and a laminated core back 211.
  • the twelve laminated teeth 212 protrude toward the center of the annular laminated core back 211.
  • a winding 220 is attached to each laminated tooth 212.
  • the winding 220 may be attached to at least one of the twelve laminated teeth 212.
  • the winding may be attached to nine or six of the twelve laminated teeth 212.
  • the laminate 210 a plurality of annular core sheets 230 are laminated.
  • the laminate 210 according to the present embodiment includes 60 annular core sheets 230.
  • the number of stacked layers is not limited to this, and is appropriately determined according to, for example, necessary characteristics required for the motor.
  • the number of stacked layers may be the same as the number of slots or may be larger than the number of slots.
  • the number of stacked layers may be smaller than the number of slots.
  • the annular core sheet 230 has an annular core back 231 and twelve teeth 232 that are arranged at equal intervals on the inner periphery of the core back 231 and project toward the center of the core back 231.
  • the term “equal intervals” is not limited to being strictly equal intervals, and includes cases where the intervals are substantially equal.
  • the tips of the twelve teeth 232 are arranged in an annular shape and form the inner periphery of the annular core sheet 230.
  • the plurality of annular core sheets 230 are laminated in the laminate 210 so that the positions of the twelve teeth 232 are aligned between the plurality of annular core sheets 230. As shown in FIG.
  • the annular core sheet 230 has one connecting portion 233 that connects the tips of two adjacent teeth 232 and includes a joint.
  • each annular core sheet 230 may have a plurality of connecting portions 233.
  • one annular core sheet 230 has twelve connecting portions 233 as many as the number of teeth 232, and the other has two continuous annular core sheets 230 not having connecting portions 233 in the laminate 210. May be laminated.
  • at least one of the plurality of annular core sheets 230 may have at least one connecting portion 233.
  • the stacked body 210 only needs to have at least one connecting portion 233.
  • FIG. 5A shows a pair of adjacent two laminated teeth 212 in an enlarged manner.
  • FIG. 5B shows an enlarged view of one of the plurality of connecting portions 233 between a pair of adjacent two stacked teeth 212.
  • FIG. 6 is a development view of the laminated body 210 obtained by cutting the laminated core back 211 located between a pair of laminated teeth 212 in the y direction and developing the laminated body 210 in the x direction.
  • the plurality of connecting portions 233 exist between the tips of a pair of adjacent two laminated teeth 212.
  • the connecting portion 233 exists between the 60 annular core sheets 230 for every 12 annular core sheets 230.
  • Five connecting portions 233 exist between the tips of a pair of two adjacent laminated teeth 212. This is merely an example, and the connecting portions 233 can be arranged in various patterns. For example, there are five connecting portions 233 between the tips of a pair of adjacent two stacked teeth 212, and four connecting portions between the tips of another pair of adjacent stacked teeth 212. 233 may be present.
  • connecting portions 233 there are five or more connecting portions 233 between the tips of two adjacent adjacent laminated teeth 212, and the connecting portion 233 is provided between the tips of another pair of adjacent adjacent two stacked teeth 212. It does not have to exist. According to the present disclosure, it is sufficient that at least one connecting portion 233 is present in the stacked body 210. For example, the same number of connecting portions 233 as the teeth 232 exist in a certain annular core sheet 230, and the connecting portions 233 may not exist at all in a certain annular core sheet.
  • the connecting portion 233 has a joint 234.
  • the joint 234 appears to be connected apparently.
  • the joint 234 has two cut surfaces 235A and 235B that are mechanically cut. Specifically, the first cutting surface 235A on one side of the two adjacent teeth 212 of the connecting portion 233 and the second cutting surface 235B on the other side of the connecting portion 233 are in contact with each other at the joint 234. Yes.
  • An adhesive or the like may be interposed between the two cut surfaces 235A and 235B, or the two cut surfaces 235A and 235B may be coated with a nonmagnetic material.
  • connection part 233 by this indication is cut
  • the rigidity of the stator specifically, the strength of the inner peripheral portion of the laminate 210) can be increased by the connecting portion 233.
  • the magnetic flux leakage through the connection part 233 can be suppressed by the cut surface cut mechanically. Suppression of magnetic flux leakage leads to improvement of cogging torque, for example.
  • the laminated body 210 has a plurality of connecting portions 233 that are periodically arranged in the circumferential direction of the core back 231 (in other words, the ring formed by the tips of the plurality of teeth 232) between the plurality of annular core sheets 230. You may do it. As shown in FIG. 6, when attention is paid to 12 consecutive annular core sheets 230 out of 60 annular core sheets 230 in the laminate 210, the 12 connecting portions 233 are located between adjacent annular core sheets 230. Can be arranged to exist in two adjacent slots 214. In other words, the twelve connecting portions 233 may exist spirally in the circumferential direction between the plurality of annular core sheets 230. By adopting the spiral structure, the strength of the inner peripheral portion of the stacked body 210 can be ensured even if the number of connecting portions 233 is small.
  • FIG. 7 shows an exemplary flow of a method for manufacturing the motor 100 and the stator 200.
  • the manufacturing method of the stator 200 includes a step of preparing a plurality of annular core sheets 230 (S600), a step of cutting the connecting portion 233 (S610), and a step of obtaining a laminated annular core (laminated body) 210 ( S620), a step of dividing the laminated annular core 210 into a plurality of divided cores 250 (S630), a step of attaching the windings 220 to the divided cores 250 (S640), and reassembling the plurality of divided cores 250 to form the stator 200. (S650).
  • the method for manufacturing the motor 100 further includes a step of housing the stator 200 and the rotor 300 in the housing 400 (S660).
  • a plurality of annular core sheets 230 shown in FIG. 4 are prepared.
  • twelve or more annular core sheets 230 having the same number as the teeth 232 are prepared.
  • the number of sheets to be prepared is not limited to this, and is appropriately determined according to, for example, necessary characteristics required for the motor 100.
  • 60 annular core sheets 230 are prepared.
  • Each annular core sheet 230 includes a core back 231, twelve teeth 232, and a connecting portion 233 that connects the tips of two adjacent teeth 232.
  • the connecting portion 233 does not yet have the joint 234.
  • at least one of the plurality of annular core sheets 230 only needs to include at least one connecting portion 233, and only a necessary number of the annular core sheets 230 may be prepared.
  • FIG. 8A schematically shows a state in which a plurality of core sheets 230 are formed by punching the electromagnetic steel sheet 700 into a ring shape using a mold 800.
  • FIG. 8B schematically shows a plurality of annular core sheets 230 formed by stamping.
  • a method for preparing a plurality of annular core sheets 230 a plurality of annular cores are formed by placing an electromagnetic steel sheet 700 on a die 810 and punching the electromagnetic steel sheet 700 into a ring shape using a mold (punch) 800 as shown in the figure.
  • the sheet 230 may be formed.
  • wire electric discharge machining or laser machining can also be used.
  • a plurality of annular core sheets 230 may be supplied as parts from a supplier.
  • the electromagnetic steel sheet 700 is punched in an annular shape using a mold 800 to form 60 annular core sheets 230.
  • step S610 the connecting portion 233 is cut.
  • FIG. 9 schematically shows how the connecting portion 233 is cut using the cutting blade 710.
  • the joint 234 is formed by mechanically cutting the approximate center of the connecting portion 233 using the cutting blade 710.
  • the first cut surface 235 ⁇ / b> A is formed on one side of the two adjacent teeth 232 of the connecting portion 233
  • the second cut surface 235 ⁇ / b> B is formed on the other side of the connecting portion 233.
  • the connecting portion 233 is mechanically cut for each annular core sheet 230 to form joints 234 in all the connecting portions 233 included in the plurality of annular core sheets 230.
  • step S620 a plurality of annular core sheets 230 are laminated to obtain a laminated annular core 210 having 12 laminated teeth 212.
  • the plurality of annular core sheets 230 are fixed by caulking, adhesion, or laser welding, for example.
  • a laminated annular core 210 having 12 laminated teeth 212 is obtained.
  • the laminated annular core 210 corresponds to the laminated body 210 described above.
  • FIG. 10 schematically shows a state in which a plurality of annular core sheets 230 are stacked by rotating in a circumferential direction by a predetermined angle for each sheet.
  • two of the 60 annular core sheets 230 are shown.
  • the plurality of annular core sheets 230 be laminated by rotating in a circumferential direction by a predetermined angle for each sheet.
  • Such a stack is generally referred to as “rolling”. Since the connecting portion 233 is spirally arranged by rolling, the strength of the inner peripheral portion of the laminated annular core 210 can be ensured.
  • the predetermined angle is N times (360 / M) (N is an integer of 1 or more).
  • M indicates the number of teeth (or slots).
  • the predetermined angle is an integral multiple of 30 °.
  • 60 annular core sheets are laminated by rotating each sheet clockwise by 30 °. Thereby, an arrangement pattern (that is, a spiral structure) of the connecting portions 233 as shown in FIG. 6 is obtained in the laminated annular core 210.
  • 10 is a direction parallel to the central axis of the laminated annular core 210.
  • the 60 annular core sheets 230 are laminated along the y direction so that 12 teeth 232 are aligned.
  • step S630 the laminated annular core 210 is divided into 12 or less divided cores 250.
  • FIG. 11A schematically shows a state in which the laminated annular core 210 is divided into 12 divided cores 250.
  • FIG. 11B schematically shows a state where the jig 900 is inserted into the slot 214 and the laminated annular core 210 is divided.
  • FIG. 11C is a plan view of the twelve divided cores 250 as seen from the stacking direction of the stacked annular cores 210.
  • FIG. 11B shows an enlarged part of the laminated annular core 210.
  • the jig 900 is inserted into the slot 214 in the direction of the arrow shown in FIG. 11A. Specifically, as shown in FIG.
  • each laminated annular core 210 has one laminated tooth. It is divided into 12 divided cores 250 having 212.
  • the cuts 237 are formed in advance in the core back 231 of each annular core sheet 230, so that the laminated annular core 210 can be easily divided.
  • the jig 900 may be inserted and divided one by one, or the jig 900 may be simultaneously inserted and divided at a plurality of positions.
  • the laminated annular core 210 is divided so that each divided core 250 has one laminated tooth 212.
  • step S640 the winding 220 is attached to at least one of the twelve divided cores 250.
  • FIG. 12A is a plan view of the split core 250 to which the winding 220 is attached.
  • FIG. 12B is a perspective view of the split core 250 in which the winding 220 is attached to the laminated tooth 212.
  • the insulating member 260 is attached to each of the laminated teeth 212 of the twelve divided cores 250, and the winding 220 is attached thereon (so-called concentrated winding).
  • spindle winding and nozzle winding can be used as a method of winding the conducting wire around the split core 250. It is not necessary to attach the windings 220 to all the split cores 250 (laminated teeth 212), and the windings 220 may be attached to the required number of split cores 250 according to the design specifications. In other words, the winding 220 may be attached to at least one laminated tooth 212 of the twelve divided cores 250. For example, the winding 220 may be attached to the nine laminated teeth 212 of the twelve divided cores 250.
  • step S650 the plurality of split cores 250 each having the winding 220 attached thereto are reassembled to obtain the annular stator 200.
  • FIG. 13 schematically shows a state in which the laminated annular core 210 divided into a plurality of divided cores 250 is returned to an annular shape using a jig (not shown).
  • FIG. 14 schematically shows how the cut surfaces of the connecting portion 233 are brought into contact with each other during reassembly.
  • “Reassembly” means that the plurality of split cores 250 are fixed to each other and returned to the shape before splitting (that is, annular). More specifically, after the winding 220 is attached, the 12 divided cores 250 are reassembled to generate the annular stator 200. Each cut surface of the split core 250 has an uneven shape.
  • the cut surfaces of two adjacent divided cores 250 are brought into contact with each other, the shapes of the two cut surfaces are matched, and the divided cores 250 can be returned to the positional relationship before cutting.
  • the cut surfaces of the connecting portion 233 cut in step S610 are brought into contact with each other.
  • the cut surfaces of the connecting portion 233 can also be matched.
  • 12 divided cores 250 are reassembled using a jig. At that time, as shown in FIG. 14, the respective cut surfaces (first and second cut surfaces 235 ⁇ / b> A, 235 ⁇ / b> B) of the 60 connecting portions 233 mechanically cut are brought into contact with each other.
  • the plurality of divided cores 250 are fixed by, for example, adhesion or laser welding. This fixing is performed in consideration of (1) circumferential variation and (2) axial height variation of the laminated annular core 210 among the plurality of laminated teeth 212.
  • disconnecting the connection part 233 before making a cut surface contact, you may coat each cut surface with a nonmagnetic material. Further, the cut surfaces may be brought into contact with each other through an adhesive.
  • a tooth iron core (corresponding to the ring core sheet 230 excluding the core back 231) and a yoke iron core (corresponding to the core back 231) are prepared as independent members as in Patent Document 1.
  • a punching variation (error) due to a mold may occur between the plurality of teeth 232, and therefore, at the time of assembly (particularly after the tooth core is press-fitted into the yoke core), Misalignment occurs and it is difficult to bring the tips of two adjacent teeth into contact with each other.
  • the annular core sheet 230 including the core back 231 and the coupling part 233 is punched in an annular shape, and then the coupling part 233 is cut.
  • the cut surfaces can be kept in contact with each other even after the connecting portion 233 is cut.
  • the cut surfaces can be kept in contact with each other until the laminated annular core 210 is divided (until just before the division).
  • the positional deviation of the tip of the tooth 232 that occurs during press-fitting does not occur. Therefore, when the split cores 250 are reassembled, the cut surfaces of the cut connecting portions 233 can be brought into contact with each other.
  • stator 200 and the rotor 300 are housed in the housing 400 in step S660.
  • the rotor core 331 and the magnet holder 332 are integrated by insert molding. More specifically, resin is injected around the rotor core 331 inserted into the mold to integrate the rotor core 331 and the resin. When the resin is cooled and solidified, the magnet holder 332 is formed. Next, the magnet 333 is inserted into the integrated rotor core 331 and magnet holder 332. Thereby, the magnet 333 is fixed to the side surface of the rotor core 331 while being supported by the magnet holder 332.
  • a lower bearing 430 (for example, a ball bearing) is disposed in the recess 410 of the housing 400.
  • the shaft 340 is inserted into the lower bearing 430, and the rotor 300 integrated with the shaft 340 is disposed in the internal space of the stator 200.
  • an upper bearing 440 (for example, a ball bearing) is disposed in the circular hole 421 of the lid portion 420, and the opening at the top of the housing 400 is closed by the lid portion 420.
  • the laminated annular core 210 is divided by forming the joint 234 in the coupling portion 233, so that the plurality of laminated teeth are not affected by the coupling portion 233.
  • the winding 220 can be easily attached to 212, and the press-fitting work into the laminated core back 211 as in Patent Document 1, for example, becomes unnecessary.
  • the press-fitting work into the laminated core back 211 as in Patent Document 1 becomes unnecessary.
  • the connecting portion 233 since there is no state in which only the connecting portion 233 is connected in the assembling process, deformation of the connecting portion 233 can be prevented.
  • the rigidity of the stator 200 can be increased by the connecting portion 233 and the vibration of the motor 100 can be reduced. Moreover, since the connection part 233 has the cut surface cut
  • the motor 100 including the connecting portion 233 a structure for more effectively reducing the vibration of the motor 100 will be described.
  • the stator 200 includes twelve laminated teeth 212 and the rotor includes eight magnets 333
  • the arrangement of the connecting portions 233 that more effectively reduce vibration will be described.
  • FIG. 15 is a plan view showing an example of the stator 200 and the rotor 300 included in the motor 100.
  • FIG. 16 is a plan view showing an example of the stator 200.
  • the winding 220 is not shown in FIGS. 15 and 16.
  • the stator 200 includes twelve laminated teeth 212.
  • the rotor 300 includes eight magnets 333. A structure including such a number of laminated teeth 212 and magnets 333 may be referred to as 12S8P (12 slots 10 poles).
  • the motor 100 is a three-phase motor having three-phase (U-phase, V-phase, W-phase) windings.
  • the twelve laminated teeth 212 include U, V, W, U, V, W, U, V, W, U, V, W in the order of U phase, V phase, W phase. Is assigned.
  • Each of the plurality of annular core sheets 230 included in the stator 200 includes 12 teeth 232.
  • the U-phase, V-phase, and W-phase are assigned to the 12 teeth 232 of the annular core sheet 230 in the order shown in FIG.
  • FIG. 17 is a view showing a position where the connecting portion 233 in the stator 200 is arranged. Twelve laminated teeth 212 to which a U phase, a V phase, and a W phase are assigned are arranged along the horizontal direction of FIG. Numerical values of 0, 30, 60,..., 330 arranged in the horizontal direction indicate angles along the circumferential direction of the stator 200. Since the number of the laminated teeth 212 is 12, the laminated teeth 212 are arranged on the stator 200 at intervals of 30 degrees.
  • the stator 200 includes 12 annular core sheets 230. The numbers 1, 2, 3,..., 12 arranged in the vertical direction in FIG. 17 indicate the 12 annular core sheets 230 stacked.
  • the laminated body 210 of the stator 200 has a structure in which twelve annular core sheets 230 are laminated by rotating in the circumferential direction by 30 degrees for each sheet. That is, the transversion angle is 30 degrees.
  • the number of the annular core sheets 230 is twelve, but this number is an example, and the number is appropriately determined according to necessary characteristics required for the motor. For example, as described above, 60 annular core sheets 230 may be stacked.
  • each of the 12 annular core sheets 230 includes two connecting portions 233.
  • a black square portion in FIG. 17 represents the connecting portion 233.
  • the two connecting portions 233 included in each of the 12 annular core sheets 230 connect the teeth to which the two phases of the three phases of the U phase, the V phase, and the W phase are assigned.
  • the two connecting portions 233 included in the annular core sheet 230 located at the top include the teeth 232 to which the W phase is assigned and the teeth 232 to which the U phase is assigned. It is connected.
  • the two connecting portions 233 are 180 degrees apart.
  • the two connecting portions 233 included in the fourth, seventh, and tenth annular core sheets 230 from the top connect the tooth 232 to which the W phase is assigned and the tooth 232 to which the U phase is assigned. is doing.
  • the two connecting portions 233 included in the annular core sheet 230 positioned second from the top are teeth 232 to which the U phase is assigned and teeth 232 to which the V phase is assigned. Are connected.
  • the two connecting portions 233 are 180 degrees apart.
  • the two connecting portions 233 included in the fifth, eighth, and eleventh annular core sheets 230 from the top connect the teeth 232 to which the U phase is assigned and the teeth 232 to which the V phase is assigned. is doing.
  • the two connecting portions 233 included in the third annular core sheet 230 from the top are teeth 232 to which the V phase is assigned and teeth 232 to which the W phase is assigned. Are connected.
  • the two connecting portions 233 are 180 degrees apart.
  • the two connecting portions 233 included in the sixth, ninth, and twelfth annular core sheets 230 from the top connect the tooth 232 to which the V phase is assigned and the tooth 232 to which the W phase is assigned. is doing.
  • the inventor of the present application performed a simulation on the operation of the motor 100 having the stator structure shown in FIG. 17 and examined the result. Details of the operation of the motor 100 will be described later with reference to FIG.
  • FIG. 18 is a diagram illustrating another example of a position where the connecting portion 233 in the stator 200 is disposed. Twelve laminated teeth 212 to which a U phase, a V phase, and a W phase are assigned are arranged along the horizontal direction of FIG. The numbers 0, 30, 60,..., 330 arranged in the horizontal direction in FIG. 18 and the numbers 1, 2, 3,..., 12 arranged in the vertical direction are the same as those in FIG. is there.
  • the laminated body 210 of the stator 200 has a structure in which twelve annular core sheets 230 are laminated by rotating in the circumferential direction by 30 degrees for each sheet.
  • each of the 12 annular core sheets 230 includes four connecting portions 233.
  • a black square portion in FIG. 18 represents the connecting portion 233.
  • the four connecting portions 233 included in each of the twelve annular core sheets 230 connect the teeth to which the two phases of the three phases of the U phase, the V phase, and the W phase are assigned.
  • the four connecting portions 233 provided in the uppermost annular core sheet 230 include teeth 232 to which the W phase is assigned and teeth 232 to which the U phase is assigned. It is connected.
  • the four connecting portions 233 are arranged with an interval of 90 degrees.
  • the four connecting portions 233 included in the fourth, seventh, and tenth annular core sheets 230 from the top connect the tooth 232 to which the W phase is assigned and the tooth 232 to which the U phase is assigned. is doing.
  • the four connecting portions 233 included in the annular core sheet 230 positioned second from the top include teeth 232 to which the U phase is assigned and teeth 232 to which the V phase is assigned. Are connected.
  • the four connecting portions 233 are arranged with an interval of 90 degrees.
  • the four connecting portions 233 included in the fifth, eighth, and eleventh annular core sheets 230 from the top connect the teeth 232 to which the U phase is assigned and the teeth 232 to which the V phase is assigned. is doing.
  • the four connecting portions 233 provided in the third annular core sheet 230 from the top are teeth 232 to which the V phase is assigned and teeth 232 to which the W phase is assigned. Are connected.
  • the four connecting portions 233 are arranged with an interval of 90 degrees.
  • the four connecting portions 233 included in the sixth, ninth, and twelfth annular core sheets 230 from the top connect the teeth 232 to which the V phase is allocated and the teeth 232 to which the W phase is allocated. is doing.
  • the inventor of the present application performed a simulation on the operation of the motor 100 having the stator structure shown in FIG. 18 and examined the result. Details of the operation of the motor 100 will be described later with reference to FIG.
  • FIG. 19 is a diagram showing still another example of the position where the connecting portion 233 in the stator 200 is arranged. Twelve laminated teeth 212 to which a U phase, a V phase, and a W phase are assigned are arranged along the horizontal direction of FIG. 19, the numbers 0, 30, 60,..., 330 arranged in the horizontal direction and the numbers 1, 2, 3,..., 12 arranged in the vertical direction have the same meaning as in FIG. is there.
  • the laminated body 210 of the stator 200 has a structure in which twelve annular core sheets 230 are laminated by rotating in the circumferential direction by 30 degrees for each sheet.
  • each of the twelve annular core sheets 230 includes one connecting portion 233.
  • a black square portion represents the connecting portion 233.
  • One connecting portion 233 included in each of the 12 annular core sheets 230 connects the teeth to which the two phases of the three phases of the U phase, the V phase, and the W phase are assigned.
  • one connecting portion 233 provided in the uppermost annular core sheet 230 includes teeth 232 to which the W phase is assigned and teeth 232 to which the U phase is assigned. It is connected.
  • one connecting portion 233 provided in each of the fourth, seventh, and tenth annular core sheets 230 from the top connects the tooth 232 to which the W phase is assigned and the tooth 232 to which the U phase is assigned. is doing.
  • one connecting portion 233 provided in the second annular core sheet 230 from the top includes teeth 232 to which the U phase is assigned and teeth 232 to which the V phase is assigned. Are connected.
  • one connecting portion 233 included in each of the fifth, eighth, and eleventh annular core sheets 230 from the top connects the teeth 232 to which the U phase is allocated and the teeth 232 to which the V phase is allocated. is doing.
  • one connecting portion 233 provided in the third annular core sheet 230 from the top includes teeth 232 to which the V phase is assigned and teeth 232 to which the W phase is assigned. Are connected.
  • one connecting portion 233 included in each of the sixth, ninth, and twelfth annular core sheets 230 from the top connects the tooth 232 to which the V phase is assigned and the tooth 232 to which the W phase is assigned. is doing.
  • the inventor of the present application performed a simulation on the operation of the motor 100 having the stator structure shown in FIG. 19 and examined the result. Details of the operation of the motor 100 will be described later with reference to FIG.
  • FIG. 20 is a diagram showing still another example of a position where the connecting portion 233 in the stator 200 is arranged. Twelve laminated teeth 212 to which a U phase, a V phase, and a W phase are assigned are arranged along the horizontal direction of FIG. The numbers 0, 30, 60,..., 330 arranged in the horizontal direction in FIG. 20 and the numbers 1, 2, 3,..., 12 arranged in the vertical direction are the same as those in FIG. is there.
  • the laminated body 210 of the stator 200 has a structure in which twelve annular core sheets 230 are laminated by rotating in the circumferential direction by 30 degrees for each sheet.
  • each of the 12 annular core sheets 230 includes three connecting portions 233.
  • a black square portion in FIG. 20 represents the connecting portion 233.
  • one of the three connecting portions 233 provided in the uppermost annular core sheet 230 is assigned the teeth 232 to which the W phase is assigned and the U phase.
  • the teeth 232 are connected.
  • Another one of the three connecting portions 233 connects the tooth 232 to which the U phase is assigned and the tooth 232 to which the V phase is assigned.
  • Yet another one of the three connecting portions 233 connects the tooth 232 to which the V phase is assigned and the tooth 232 to which the W phase is assigned.
  • the three connecting portions 233 are arranged with an interval of 120 degrees.
  • the three connecting portions 233 included in the second to twelfth annular core sheets 230 counted from the top are also arranged with an interval of 120 degrees.
  • the teeth are connected to each other.
  • Twelve annular core sheets 230 are laminated by rotating 30 degrees in the circumferential direction for each sheet. For this reason, in the annular core sheets 230 adjacent to each other, the position of the connecting portion 233 is shifted by 30 degrees.
  • FIG. 21 is a diagram showing simulation results of the operation of the motor 100 having the stator structure shown in FIGS.
  • the vertical axis in FIG. 21 represents acceleration, and the horizontal axis represents angle.
  • a solid line 301 indicates the acceleration of the rotor 300 of the motor 100 having the stator structure shown in FIG.
  • each of the twelve annular core sheets 230 includes one connecting portion 233.
  • a solid line 302 indicates the acceleration of the rotor 300 of the motor 100 having the stator structure shown in FIG.
  • each of the 12 annular core sheets 230 includes two connecting portions 233.
  • a solid line 303 indicates the acceleration of the rotor 300 of the motor 100 having the stator structure shown in FIG.
  • each of the twelve annular core sheets 230 includes three connecting portions 233.
  • a solid line 304 indicates the acceleration of the rotor 300 of the motor 100 having the stator structure shown in FIG.
  • each of the 12 annular core sheets 230 includes four connecting portions 233.
  • a solid line 30N indicates the acceleration of the rotor 300 of the motor 100 that does not include the connecting portion 233.
  • the vibration of the motor 100 can be reduced more effectively.
  • the embodiments of the present disclosure can be widely used in various motors used in vacuum cleaners, dryers, ceiling fans, washing machines, refrigerators, electric power steering devices, and the like.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

Ce stator (200) destiné à un moteur électrique (100) comprend : un corps stratifié (210) ayant une pluralité de feuilles de noyau annulaires (230) stratifiées en son sein et une pluralité de dents stratifiées (212) ; et une pluralité d'enroulements (220) fixés à la pluralité de dents stratifiées (212). Chaque feuille de la pluralité de feuilles de noyau annulaires (230) comprend : un dos de noyau annulaire (231) ; une pluralité de dents (232) agencées à des intervalles réguliers sur la circonférence interne du dos de noyau (231) et faisant saillie vers le centre du dos de noyau (231) ; et une section de couplage (233) qui couple les pointes de deux dents adjacentes (232) et comprend une articulation (234).
PCT/JP2018/009034 2017-03-31 2018-03-08 Stator de moteur électrique et moteur électrique WO2018180343A1 (fr)

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JP2019509137A JP7147745B2 (ja) 2017-03-31 2018-03-08 電動モータ用ステータおよび電動モータ
CN201880020831.1A CN110462979A (zh) 2017-03-31 2018-03-08 电动马达用定子和电动马达

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JP7435154B2 (ja) * 2020-03-27 2024-02-21 ニデック株式会社 板積層体、積層鉄心及びモータ

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05344665A (ja) * 1992-06-05 1993-12-24 Fujitsu General Ltd 電動機の固定子
JP2004180383A (ja) * 2002-11-26 2004-06-24 Aichi Electric Co Ltd 固定子及びその製造方法
JP2005080474A (ja) * 2003-09-03 2005-03-24 Asmo Co Ltd ブラシレスモータ
JP2007151232A (ja) * 2005-11-24 2007-06-14 Toshiba Corp 永久磁石型モータ及びそれを使用した電動パワーステアリング装置
JP2010284025A (ja) * 2009-06-05 2010-12-16 Fuji Electric Systems Co Ltd 永久磁石型回転機
JP2011035947A (ja) * 2009-07-29 2011-02-17 Mitsubishi Electric Corp 電動機の固定子及び電動機及び空気調和機及びポンプ

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Publication number Priority date Publication date Assignee Title
KR20080089477A (ko) * 2006-01-24 2008-10-06 가부시키가이샤 야스카와덴키 모터 고정자용의 분할 코어, 그 모터 고정자, 영구자석형 동기 모터, 및 분할 코어 펀칭 금형에 의한 펀칭 방법
CN108886304B (zh) * 2016-03-31 2021-02-05 日本电产株式会社 电动马达用定子及其制造方法、电动马达及其制造方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05344665A (ja) * 1992-06-05 1993-12-24 Fujitsu General Ltd 電動機の固定子
JP2004180383A (ja) * 2002-11-26 2004-06-24 Aichi Electric Co Ltd 固定子及びその製造方法
JP2005080474A (ja) * 2003-09-03 2005-03-24 Asmo Co Ltd ブラシレスモータ
JP2007151232A (ja) * 2005-11-24 2007-06-14 Toshiba Corp 永久磁石型モータ及びそれを使用した電動パワーステアリング装置
JP2010284025A (ja) * 2009-06-05 2010-12-16 Fuji Electric Systems Co Ltd 永久磁石型回転機
JP2011035947A (ja) * 2009-07-29 2011-02-17 Mitsubishi Electric Corp 電動機の固定子及び電動機及び空気調和機及びポンプ

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CN110462979A (zh) 2019-11-15

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