WO2022181167A1 - モータ及び電動工具 - Google Patents
モータ及び電動工具 Download PDFInfo
- Publication number
- WO2022181167A1 WO2022181167A1 PCT/JP2022/002912 JP2022002912W WO2022181167A1 WO 2022181167 A1 WO2022181167 A1 WO 2022181167A1 JP 2022002912 W JP2022002912 W JP 2022002912W WO 2022181167 A1 WO2022181167 A1 WO 2022181167A1
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- WIPO (PCT)
- Prior art keywords
- core
- teeth
- motor
- stator
- wiring
- Prior art date
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- 230000007704 transition Effects 0.000 claims description 36
- 241001122767 Theaceae Species 0.000 claims description 5
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- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 230000005483 Hooke's law Effects 0.000 description 1
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- 230000004907 flux Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
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- 229910001172 neodymium magnet Inorganic materials 0.000 description 1
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Images
Classifications
-
- 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
- H02K1/14—Stator cores with salient poles
- H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
- H02K1/148—Sectional cores
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/28—Layout of windings or of connections between windings
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
- H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
- H02K21/16—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures having annular armature cores with salient poles
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/18—Windings for salient poles
-
- 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
- H02K3/52—Fastening salient pole windings or connections thereto
- H02K3/521—Fastening salient pole windings or connections thereto applicable to stators only
- H02K3/522—Fastening salient pole windings or connections thereto applicable to stators only for generally annular cores with salient poles
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2203/00—Specific aspects not provided for in the other groups of this subclass relating to the windings
- H02K2203/06—Machines characterised by the wiring leads, i.e. conducting wires for connecting the winding terminations
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2203/00—Specific aspects not provided for in the other groups of this subclass relating to the windings
- H02K2203/12—Machines characterised by the bobbins for supporting the windings
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
- H02K7/145—Hand-held machine tool
Definitions
- the present disclosure relates to a motor and an electric power tool, and more particularly to a motor including a stator core and a rotor and an electric power tool including the motor.
- Patent Document 1 discloses a disk drive motor in which both edges of an annular yoke are crimped and fixed so that the entire circumference is sealed.
- An object of the present disclosure is to provide a motor and an electric tool in which stator wiring can be easily reduced and Joule loss can be easily reduced.
- a motor includes a stator having a stator core and stator wiring, and a rotor having magnets and rotating with respect to the stator core.
- the stator core has a tee core and a yoke core.
- the tooth core has a cylindrical inner cylindrical portion in which the rotor is arranged, and a plurality of teeth including a body portion projecting outward from the inner cylindrical portion in a radial direction of the inner cylindrical portion. .
- the yoke core is attached to the plurality of teeth and has a tubular shape surrounding the plurality of teeth.
- the stator wiring includes a coil wire wound around the trunk and transition wires electrically connecting the plurality of coil wires wound around the trunk. The transition wiring is positioned inside the body portion in the radial direction.
- a power tool according to one aspect of the present disclosure includes the motor.
- FIG. 1 is an exploded view of essential parts of a motor according to one embodiment.
- FIG. 2 is a schematic diagram of a power tool having the same motor.
- FIG. 3 is a sectional view of the same motor.
- FIG. 4 is an exploded view of the same motor (excluding the base).
- FIG. 5A is a front view seen from one end side of the tooth core of the motor;
- FIG. 5B is an enlarged view of a main part of FIG. 5A.
- FIG. 6 is a rear view of the second insulator of the motor as seen from the other end side.
- FIG. 7 is a rear view of the same motor (excluding the circuit board and base) viewed from the other end side.
- FIG. 1 is an exploded view of essential parts of a motor according to one embodiment.
- FIG. 2 is a schematic diagram of a power tool having the same motor.
- FIG. 3 is a sectional view of the same motor.
- FIG. 4 is an exploded view of the same motor (excluding the base
- FIG. 8 is a side view of the vicinity of the motor terminals of the motor as seen from a direction perpendicular to the central axis.
- FIG. 9 is a cross-sectional view of a plane perpendicular to the extending direction of the connecting wiring near the motor terminal of the same.
- a power tool according to an embodiment and a motor provided in this power tool will be described below with reference to the drawings.
- the embodiment described below is but one of the various embodiments of the present disclosure.
- the embodiments described below can be modified in various ways according to design and the like as long as the objects of the present disclosure can be achieved.
- Each drawing described in the following embodiments is a schematic drawing, and the ratio of the size and thickness of each component in the drawing does not necessarily reflect the actual dimensional ratio. .
- the power tool 10 includes a motor 1 . As shown in FIG. 2, the power tool 10 further includes a power source 101, a drive transmission section 102, an output section 103, a chuck 104, a tip tool 105, a trigger volume 106, and a control circuit 107. .
- the power tool 10 is a tool that drives a tip tool 105 with the driving force of the motor 1 .
- the motor 1 is a drive source that drives the tip tool 105 .
- Motor 1 is, for example, a brushless motor.
- a power supply 101 is a DC power supply that supplies a current for driving the motor 1 .
- Power source 101 includes, for example, one or more secondary batteries.
- the drive transmission unit 102 adjusts the output (driving force) of the motor 1 and outputs it to the output unit 103 .
- the output portion 103 is a portion that is driven (for example, rotated) by the driving force output from the drive transmission portion 102 .
- the chuck 104 is fixed to the output portion 103 and is a portion to which the tip tool 105 is detachably attached.
- the tip tool 105 (also referred to as a bit) is, for example, a driver, socket, drill, or the like. Among various types of tip tools 105, the tip tool 105 corresponding to the application is attached to the chuck 104 and used.
- the trigger volume 106 is an operation unit that receives an operation for controlling the rotation of the motor 1.
- the motor 1 By pulling the trigger volume 106, the motor 1 can be turned on and off. Further, the rotation speed of the output unit 103, that is, the rotation speed of the motor 1 can be adjusted by the operation amount of the operation to pull the trigger volume 106.
- FIG. The control circuit 107 rotates or stops the motor 1 and controls the rotation speed of the motor 1 according to the operation input to the trigger volume 106 .
- the tip tool 105 is attached to the chuck 104 . By controlling the rotation speed of the motor 1 by operating the trigger volume 106, the rotation speed of the tip tool 105 is controlled.
- the power tool 10 of the embodiment is equipped with the chuck 104 so that the tip tool 105 can be replaced depending on the application, but the tip tool 105 need not be replaceable.
- the power tool 10 may be a power tool that can use only a specific tip tool 105 .
- a motor 1 includes a stator 2 and a rotor 3 .
- the rotor 3 has an output shaft 32 .
- the stator 2 has a stator core 20 and stator wiring 21 .
- the rotor 3 rotates around the central axis 320 of the output shaft 32 with respect to the stator 2 . That is, magnetic flux generated from a plurality of (nine in FIG. 1) coil wires 22 wound around the stator core 20 generates an electromagnetic force that rotates the rotor 3 .
- the motor 1 transmits the rotational force (driving force) of the rotor 3 from the output shaft 32 to the drive transmission section 102 (see FIG. 2).
- the stator core 20 has a tee core 4 and a yoke core 5.
- a yoke core 5 is attached to the tee core 4 .
- the tooth core 4 has a cylindrical inner cylindrical portion 41 and a plurality of (nine in FIG. 1) teeth 42 .
- the rotor 3 is arranged inside the inner cylindrical portion 41 .
- Each of the multiple teeth 42 includes a trunk portion 421 and two tip pieces 422 .
- the trunk portion 421 protrudes outward from the inner tubular portion 41 in the radial direction of the inner tubular portion 41 .
- a plurality of (nine in FIG. 1) trunk portions 421 are formed in the inner cylindrical portion 41 at intervals in the circumferential direction.
- the two tip pieces 422 extend in a direction intersecting the projecting direction of the body portion 421 from the tip side portion of the body portion 421 .
- a coil wire 22 is wound around the trunk portion 421 via an insulator 6 (see FIG. 3), which will be described later.
- the two tip pieces 422 are provided as retainers that prevent the coil wire 22 from coming off the body 421 . That is, when the coil wire 22 is about to move to the tip side of the body portion 421, the coil wire 22 is caught by the two tip pieces 422, thereby preventing the coil wire 22 from coming off.
- the rotor 3 has a cylindrical rotor core 30 , a plurality of (six in FIG. 1) permanent magnets 31 , and an output shaft 32 .
- the output shaft 32 is held inside the rotor core 30 .
- the permanent magnets 31 are arranged in a polygonal shape (hexagonal shape).
- teeth core 4 of stator core 20 includes a plurality of steel plates 40 .
- Tee score 4 is formed by laminating a plurality of steel plates 40 in the thickness direction.
- Each steel plate 40 is made of a magnetic material.
- Each steel plate 40 is, for example, a silicon steel plate.
- the shape of the inner cylindrical portion 41 is cylindrical, and the central axis thereof coincides with the central axis 320 of the output shaft 32 (see FIGS. 3 and 4).
- the thickness direction of the plurality of steel plates 40 coincides with the central axis 320 direction.
- the inner cylindrical portion 41 is continuous in the circumferential direction. In other words, the inner cylindrical portion 41 is continuously connected in the circumferential direction.
- the shape of the body portions 421 of the plurality of teeth 42 is rectangular parallelepiped.
- the trunk portion 421 protrudes outward from the inner tubular portion 41 in the radial direction of the inner tubular portion 41 .
- the body portions 421 of the plurality of teeth 42 are provided at regular intervals in the circumferential direction of the inner cylindrical portion 41 .
- the two tip pieces 422 extend in a direction intersecting the projecting direction of the body portion 421 from the tip side portion of the body portion 421 . More specifically, the two tip pieces 422 are provided on both sides in the circumferential direction of the inner cylindrical portion 41 at the tip side portion of the body portion 421 . The two tip pieces 422 extend in the circumferential direction of the inner tubular portion 41 .
- the outer surface in the radial direction of the inner cylindrical portion 41 includes the curved surface 44 .
- the shape of the curved surface 44 is arcuate along a circle concentric with the inner tubular portion 41 .
- Each tip piece 422 has a curved portion 45 at a portion connected to the trunk portion 421 .
- the curved portion 45 curves away from the trunk portion 421 in the circumferential direction of the inner tubular portion 41 toward the outer side in the radial direction of the inner tubular portion 41 . That is, the curved portion 45, which is the portion on the proximal side of each tip piece 422, is chamfered into an R shape.
- the inner cylindrical portion 41 has a plurality of (nine in this embodiment) connecting portions 410 that connect adjacent body portions 421 .
- the connecting portion 410 is formed in an arc shape when viewed from the central axis 320 direction.
- An elastic deformation portion 43 is formed in a part of the inner cylinder portion 41 .
- the elastically deforming portion 43 will be described in detail in the section (3) Characteristic Configuration of the Motor, which will be described later.
- the stator wiring 21 includes a coil wire 22 wound around the trunk portion 421 and transition wires 23 that electrically connect the coil wires 22 wound around a plurality of trunk portions 421 . have.
- each coil wire 22 and transition wiring 23 are enameled wires, for example.
- This winding has a linear conductor and an insulating coating covering the conductor.
- the stator wiring 21 is composed of a single electric wire.
- the stator core 20 further includes insulators 6 covering the teeth cores 4 .
- the insulator 6 is made of synthetic resin, for example.
- the insulator 6 has electrical insulation.
- the insulator 6 covers at least part of the multiple teeth 42 .
- the insulator 6 is composed of two members, a first insulator 61 and a second insulator 62 .
- the first insulator 61 and the second insulator 62 are arranged in the central axis 320 direction.
- the 1st insulator 61 and the 2nd insulator 62 are formed in the shape which can fit several teeth 42 from the central axis 320 direction. That is, the first insulator 61 is attached to the tooth core 4 and covers the plurality of teeth 42 from one end side (the left side in FIG.
- the first insulator 61 and the second insulator 62 include a cylindrical body 63 that overlaps the inner cylindrical portion 41 when viewed from the direction of the central axis 320, and a plurality of (nine in FIG. 6) tooth covering portions 64 that cover the plurality of teeth 42. have.
- the cylindrical body 63 is formed in a cylindrical shape that is concentric with the inner cylindrical portion 41 , and has a center axis aligned with the center axis 320 of the output shaft 32 .
- Each tooth covering portion 64 protrudes outward from the cylindrical body 63 in the radial direction of the cylindrical body 63 .
- the second insulator 62 has a plate portion 66 inside the cylindrical body 63 .
- a hole 660 is formed in the center of the plate portion 66 in which an outer ring of a second bearing 34 (see FIG. 3), which will be described later, is fitted.
- a guide support portion 26 is formed on the surface 60 of the plate portion 66 . Note that the guide support portion 26 will be described in detail in the section (3) Characteristic Configuration of the Motor, which will be described later.
- the coil wire 22 is connected to the first insulator 61 and the second insulator 62 . It is wound around the trunk portion 421 via the insulator 6 constituted by the 2 insulators 62 .
- the coil wire 22 is wound around the trunk portion 421 so as to pass through slots (cavities) between the trunk portion 421 and two adjacent trunk portions 421 .
- the tooth covering portion 64 of the first insulator 61 extends rightward from the left portion of the tubular body 63 of the first insulator 61 . Also, the tooth covering portion 64 of the second insulator 62 extends leftward from the right portion of the tubular body 63 of the second insulator 62 , but does not reach the tooth covering portion 64 of the first insulator 61 . That is, the tooth covering portion 64 of the first insulator 61 and the tooth covering portion 64 of the second insulator 62 are not in contact with each other, and a gap 65 is formed between them, in which the teeth 42 are exposed.
- the coil wire 22 is wound so as to extend in the opposing direction of the tooth covering portion 64 of the first insulator 61 and the tooth covering portion 64 of the second insulator 62 and straddles the gap 65 , the coil wire 22 does not reach the teeth 42 . no contact.
- the thickness of the tee score 4 changes.
- the distance between the first insulator 61 and the second insulator 62 changes. It goes without saying that the tooth covering portion 64 of the first insulator 61 and the tooth covering portion 64 of the second insulator 62 may be in contact with each other so that no gap is formed therebetween.
- the yoke core 5 includes a plurality of steel plates 50.
- the yoke core 5 is formed by laminating a plurality of steel plates 50 in the thickness direction.
- Each steel plate 50 is made of a magnetic material.
- Each steel plate 50 is, for example, a silicon steel plate.
- the yoke core 5 has a cylindrical shape, and its central axis coincides with the central axis 320 of the output shaft 32 .
- the yoke core 5 is attached to a plurality of teeth 42 and surrounds the plurality of teeth 42 .
- the yoke core 5 has multiple (nine) fitting portions 51 . That is, the yoke core 5 has the same number of fitting portions 51 as the teeth 42 .
- Each of the plurality of fitting portions 51 is a recess provided on the inner peripheral surface of the yoke core 5 .
- the plurality of fitting portions 51 correspond to the plurality of teeth 42 on a one-to-one basis.
- Each of the plurality of fitting portions 51 and the tooth 42 corresponding to this fitting portion 51 among the plurality of teeth 42 are fitted together by moving in the radial direction of the inner cylindrical portion 41 .
- the yoke core 5 is thereby attached to the plurality of teeth 42 .
- each fitting portion 51 in the circumferential direction of the yoke core 5 is equal to the projecting tip of one tip piece 422 of the two tip pieces 422 protruding from the trunk portion 421 and the projecting tip of the other tip piece 422. equal to the length between Note that the term “equal” as used herein is not limited to cases in which a plurality of values completely match each other, but also includes cases in which the values differ within a permissible range of error. For example, it includes cases where there is an error within 3%, within 5%, or within 10%.
- the yoke core 5 is attached to the plurality of teeth 42 by shrink fitting, for example. That is, the tee core 4 is arranged inside the yoke core 5 while the yoke core 5 is heated and expanded in the radial direction. As a result, the inner surface of the yoke core 5 faces the distal ends of the plurality of teeth 42 in the radial direction of the inner cylindrical portion 41 with a slight gap between them and the plurality of teeth 42 . After that, when the temperature of the yoke core 5 decreases and the yoke core 5 contracts, the inner surface of the yoke core 5 comes into contact with the tips of the plurality of teeth 42 .
- the plurality of fitting portions 51 move inward in the radial direction of the yoke core 5 as the yoke core 5 contracts, so that the plurality of fitting portions 51 and the plurality of teeth 42 are fitted to each other.
- the yoke core 5 applies radially inward contact pressure of the yoke core 5 to the plurality of teeth 42 .
- the stator 2 has a circuit board 7. As shown in FIGS. The circuit board 7 supplies current to the stator wiring 21 .
- the circuit board 7 has an electric component to be mounted, and a motor terminal 71 electrically connected to the electric component and to which the transition wiring 23 is electrically connected.
- the motor terminal 71 is provided on a portion of the surface 200 of the stator core 20 on which the connecting wire 23 is arranged so as to protrude from its peripheral portion.
- the motor terminal 71 is provided so as to protrude from the surface 60 of the second insulator 62 .
- Three motor terminals 71 are provided, and each motor terminal 71 corresponds to a U-phase, a V-phase and a W-phase of a three-phase alternating current.
- the motor terminal 71 has two clamping pieces 711 forming a pair.
- the transition wiring 23 is positioned between the two clamping pieces 711 and joined to the clamping pieces 711 .
- a substrate 72 different from the circuit board 7 is provided along the surface of the second insulator 62 opposite to the surface 60 .
- rotor core 30 of rotor 3 includes a plurality of steel plates 301 .
- the rotor core 30 is formed by laminating a plurality of steel plates 301 in the thickness direction.
- Each steel plate 301 is made of a magnetic material.
- Each steel plate 301 is, for example, a silicon steel plate.
- the rotor core 30 is formed in a cylindrical shape concentric with the inner tubular portion 41 of the stator core 20 , and its central axis coincides with the central axis 320 of the output shaft 32 .
- the positions of both ends of rotor core 30 are substantially aligned with the positions of both ends of stator core 20 in the direction of central axis 320 .
- the positions of both ends of the rotor core 30 and the positions of both ends of the stator core 20 do not have to overlap each other, and may be shifted within an allowable error range. For example, the deviation may be within 3%, 5%, or 10% of the thickness of the rotor core 30 .
- the rotor core 30 includes a plurality of (six in FIG. 1) magnet housing portions 302 .
- the plurality of magnet accommodation portions 302 accommodate the plurality of permanent magnets 31 .
- Each of the plurality of magnet housing portions 302 is a through hole penetrating through the rotor core 30 in the direction of the center axis 320 .
- Each of the plurality of permanent magnets 31 is held in the magnet housing portion 302 by being inserted into the magnet housing portion 302 while being adhered with an adhesive. It should be noted that each of the plurality of permanent magnets 31 may be held in the magnet accommodating portion 302 by magnetic attraction force with the rotor core 30 without using an adhesive.
- a plurality of magnet housing portions 302 are provided at regular intervals in the circumferential direction of the rotor core 30 .
- the plurality of permanent magnets 31 are arranged at regular intervals in the circumferential direction of the rotor core 30 .
- the longitudinal direction of each of the plurality of permanent magnets 31 extends along the circumferential direction of the rotor core 30 .
- Each permanent magnet 31 is, for example, a neodymium magnet.
- the motor 1 further comprises a base 35, a first bearing 33 and a second bearing 34.
- the base 35 is attached to the rotor core 30 and rotates integrally with the rotor core 30 , the output shaft 32 and the inner ring of the first bearing 33 .
- the first bearing 33 is arranged on the left side of the rotor core 30 and its inner ring is attached to the left portion of the output shaft 32 .
- a second bearing 34 is arranged on the right side of the rotor core 30 .
- the inner ring of the second bearing 34 is attached to the right portion of the output shaft 32 and rotates integrally with the output shaft 32 , and the outer ring of the second bearing 34 is attached to the second insulator 62 .
- the teeth 42 of the teeth core 4 are attached to the body portions 421 via the insulators 6 .
- a coil wire 22 is wound.
- the yoke core 5 is attached to the teeth 42 .
- the coil wire 22 is wound around the teeth 42 using, for example, an instrument arranged on the tip side of each tooth 42 . Since the plurality of teeth 42 protrude radially outward from the inner cylindrical portion 41, the space on the tip side of each tooth 42 is widened compared to the case where the plurality of teeth 42 protrude inward. be able to. Therefore, the coil wire 22 can be easily wound around each tooth 42, and in some cases, the space factor of the coil wire 22 can be increased.
- each tooth 42 includes two end pieces 422 that prevent the coil wire 22 from coming off the body 421, the coil wire 22 can be more easily wound around each tooth 42. Furthermore, since the stress applied to each tooth 42 can be distributed to the two tip pieces 422, the possibility of deformation of the teeth 42 can be reduced. Further, tip piece 422 includes curved surface 44 , and curved surface 44 contacts yoke core 5 . Therefore, when the yoke core 5 is attached to a plurality of teeth 42, the stress applied from the yoke core 5 to each tooth 42 is distributed along the curved surface 44, compared to the case where the surface of the tip piece 422 is formed flat. easy to be
- a gap is formed between the two clamping pieces 711 (see FIG. 9) so as to be separated from the surface 60 of the second insulator 62.
- the transition wiring 23 is inserted through this gap.
- the connecting wire 23 With the connecting wire 23 inserted between the two clamping pieces 711 , the clamping pieces 711 are crimped to close the gap, and the connecting wire 23 is electrically connected to the motor terminal 71 .
- the elastically deformable portion 43 has less rigidity than other portions of the inner cylindrical portion 41 and is easily elastically deformed.
- the yoke core 5 has the teeth core 4 fitted inside by shrink fitting or the like. Applying contact pressure. Also, each tooth 42 receives tension from the transition wiring 23 . Due to these factors, the inner cylindrical portion 41 of the tea core 4 receives circumferential force, and is particularly susceptible to circumferential compressive force.
- an elastically deformable portion 43 is provided in a part of the inner cylindrical portion 41 of the tea core 4 .
- the elastically deformable portion 43 has a smaller elastic modulus (elastic modulus) in the circumferential direction of the inner tubular portion 41 than the portion of the inner tubular portion 41 other than the elastically deformable portion 43 .
- the modulus of elasticity follows the so-called Hooke's law.
- the elastically deforming portion 43 is formed in the connecting portion 410 .
- the connecting portion 410 has a smaller elastic modulus in the circumferential direction than the portion where the teeth 42 are provided. Therefore, by forming the elastically deformable portion 43 in the connecting portion 410 , it becomes easier to form the elastically deformable portion 43 in the inner cylindrical portion 41 .
- the elastically deforming portion 43 is formed only at one portion of the inner cylindrical portion 41 .
- the elastically deformable portions 43 may be formed at two or more locations on the inner cylinder portion 41 . In the case where the elastically deformable portions 43 are formed at two or more locations of the inner cylindrical portion 41, when the inner cylindrical portion 41 receives a force in the circumferential direction, it is not determined which elastically deformable portion 43 deforms the most. It becomes more difficult to control the deformation at 41 than when the elastically deformable portion 43 is formed at one location of the inner cylindrical portion 41 .
- the elastically deformable portion 43 may be formed at one or two or more locations of the inner tubular portion 41 , it is desirable that the elastically deformable portion 43 is formed at one location of the inner tubular portion 41 . Therefore, in the present embodiment, by forming the elastically deformable portion 43 only at one portion of the inner cylindrical portion 41, the deformation of the inner cylindrical portion 41 when the inner cylindrical portion 41 receives a force in the circumferential direction is further controlled. easier.
- the elastic deformation portion 43 has a groove 431 extending along the axial direction of the inner cylinder portion 41 (the direction of the central axis 320).
- the groove 431 can become a margin for shrinkage of the inner cylinder portion 41 in the circumferential direction, so the deformation (shrinkage in the circumferential direction) of the inner cylinder portion 41 can be further controlled. easier to do.
- the groove wall portion 432 forming the groove 431 is curved. As a result, when the inner cylindrical portion 41 receives a tensile force in the circumferential direction, the groove wall portion 432 can become an elongation margin of the inner cylindrical portion 41 in the circumferential direction. easier to control.
- the crossover wiring 23 is positioned in the radially inner portion 46 of the body portion 421 .
- the tooth core 4 has a plurality of teeth 42 projecting outward from the inner tubular portion 41 in the radial direction of the inner tubular portion 41 .
- a single stator wire 21 is wound around a body portion 421 of one tooth 42 to form a coil wire 22, and then stretched toward an adjacent tooth 42 to form a connecting wire 23, which is the body portion of the adjacent tooth 42. 421 to form the coil wire 22, which is repeated until all the teeth 42 are wound.
- Such work is easy to perform because the tooth core 4 has a plurality of teeth 42 protruding radially outward from the inner tubular portion 41 .
- the teeth 42 project radially outward from the inner cylindrical portion 41 , so that the distal end side of the teeth is open and a wide space is easily formed, and the stator wiring 21 is formed on the teeth 42 . It becomes easier to perform the work of winding.
- transition wiring 23 is positioned in the radially inner portion 46 of the body portion 421 , compared to the case where the transition wiring 23 is positioned in the radially outer portion 47 of the body portion 421 , The length of the transition wiring 23 (the length of the stator wiring 21) is shortened, the wires are reduced, and the joule loss is reduced.
- the transition wire 23 is located between the yoke core 5 and the tooth core 4 compared to the case where the transition wire 23 is positioned on the radially outer portion 47 of the body portion 421. It is difficult to be caught between
- the second insulator 62 has a holding portion 24 that holds the position of the transition wiring 23 .
- the holding portion 24 protrudes from the plate portion 66 along the cylindrical body 63 at a portion of the cylindrical body 63 in the circumferential direction.
- the connecting wire 23 is held by the outer peripheral surface of the holding portion 24, and movement of the connecting wire 23 inward in the radial direction is restricted. As a result, the position of the transition wiring 23 is held, and tension is generated in the transition wiring 23 due to movement of the transition wiring 23, and loss of roundness of the inner cylindrical portion 41 is suppressed. .
- the side peripheral surface 25 of the plate portion 66 of the second insulator 62 can also function as a holding portion that holds the position of the transition wiring 23 .
- the crossover wiring 23 is held between the two holding pieces 711 of the motor terminal 71 .
- the transition wiring 23 When the transition wiring 23 is led out from the motor terminal 71, it extends toward the side peripheral surface 25 (see FIG. 3) of the second insulator 62. At this time, as shown in FIGS. may contact the edge of the bottom plate 712 of the motor terminal 71 and damage the transition wiring 23 . Therefore, in this embodiment, the guide support portion 26 is provided.
- the guide support portion 26 supports the connecting wire 23 electrically connected to the motor terminal 71 in a direction to separate it from the surface 200 of the stator core 20 . As a result, the transition wiring 23 is less likely to come into contact with the edge of the bottom plate 712 of the motor terminal 71, and the transition wiring 23 is less likely to be damaged.
- the guide support portions 26 are formed on both sides of the motor terminal 71 in the peripheral portion of the surface 200 of the stator core 20 .
- the transition wiring 23 is less likely to come into contact with both edges of the bottom plate 712 of the motor terminal 71, and the transition wiring 23 is less likely to be damaged.
- the guide support portion 26 may be provided on one of the two sides sandwiching the motor terminal 71 in the peripheral portion of the surface 200 of the stator core 20 .
- the guide support portion 26 is formed on the surface 60 of the insulator 6 . Accordingly, since the guide support portion 26 is formed on the surface 60 of the insulator 6 that can be formed of synthetic resin, the guide support portion 26 is easily formed.
- the configuration of the rotor 3 can be arbitrarily changed.
- the plurality of permanent magnets 31 are not limited to being arranged in a polygonal shape, and may be arranged in a spoke shape.
- the number of permanent magnets 31 is not limited to six, and may be two or more.
- the rotor 3 may have electromagnets instead of the permanent magnets 31 .
- the shape of the rotor core 30 when viewed from the direction of the central axis 320 of the rotor core 30 is not limited to a perfect circle, and may be, for example, a circular or elliptical shape with projections and recesses on the circumference. good too.
- the motor 1 is not limited to being provided in the power tool 10.
- the motor 1 may be provided in, for example, an electric bicycle or an electrically assisted bicycle.
- the motor 1 may further have an adjuster attached to the rotor 3 .
- the shape of the adjustment part is, for example, a cylindrical weight, and the adjustment part is attached to the output shaft 32 of the rotor 3 .
- the weight balance of the rotor 3 can be adjusted by removing a part of the adjusting portion and changing the weight and the center of gravity of the adjusting portion. Alternatively, the weight balance of the rotor 3 may be adjusted by cutting a portion of the rotor core 30 . Alternatively, the weight balance of the rotor 3 may be adjusted by adjusting the position and amount of the adhesive applied to the rotor 3 .
- Each of the plurality of steel plates 40 and the plurality of steel plates 301 is preferably one member in which each part is connected. As a result, the number of parts of the motor 1 can be reduced compared to the case where each steel plate 40 (or 600) is made up of a plurality of members.
- the stator wiring 21 may be composed of a plurality of electric wires instead of a single electric wire.
- the motor (1) of the first aspect includes a stator (2) having a stator core (20) and stator wiring (21), a rotor (3) having magnets and rotating with respect to the stator core (20).
- a stator core (20) has a tee core (4) and a yoke core (5).
- the tooth core (4) has a tubular inner tubular portion (41) in which the rotor (3) is arranged, and protrudes outward from the inner tubular portion (41) in the radial direction of the inner tubular portion (41). and a plurality of teeth (42) including a body (421).
- a yoke core (5) is attached to a plurality of teeth (42) and has a tubular shape surrounding the plurality of teeth (42).
- the stator wiring (21) consists of a coil wire (22) wound around a trunk (421) and transition wires (23) that electrically connect the coil wires (22) wound around a plurality of trunks (421). , have The crossover wiring (23) is positioned radially inside the body (421).
- the length of the transition wiring (23) is shorter than when the transition wiring (23) is positioned in the radially outer portion (47) of the body (421), Joule loss is reduced as well as wires are reduced.
- stator core (20) further comprises insulators (6) covering the teeth cores (4).
- the insulator (6) has a holding portion (24) that holds the position of the transition wiring (23).
- the position of the transition wiring (23) is held, and the transition wiring (23) moves to generate tension in the transition wiring (23), or to prevent the inner cylindrical portion (41) from being perfectly circular. It is suppressed that the degree is spoiled.
- Configurations other than the first aspect are not essential to the motor (1) and can be omitted as appropriate.
- the third aspect can be realized by combining with the first or second aspect.
- a power tool (10) of the third aspect comprises the motor (1) of the first or second aspect.
- the length of the transition wiring (23) of the motor (1) included in the electric power tool (10) is shortened, which facilitates the reduction of wires and facilitates the reduction of Joule loss.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Insulation, Fastening Of Motor, Generator Windings (AREA)
Abstract
Description
図1、図2に示すように、電動工具10は、モータ1を備えている。図2に示すように、電動工具10は、電源101と、駆動伝達部102と、出力部103と、チャック104と、先端工具105と、トリガボリューム106と、制御回路107とを更に備えている。電動工具10は、先端工具105をモータ1の駆動力で駆動する工具である。
次に、図1等を参照して、モータ1の構成を説明する。モータ1は、ステータ2と、ロータ3とを備えている。ロータ3は、出力軸32を有している。ステータ2は、ステータコア20と、ステータ配線21と、を有している。ロータ3は、ステータ2に対して、出力軸32の中心軸線320回りに回転する。すなわち、ステータコア20に巻かれた複数(図1では9つ)のコイル線22から発生する磁束により、ロータ3を回転させる電磁気力が発生する。モータ1は、ロータ3の回転力(駆動力)を出力軸32から駆動伝達部102(図2参照)へ伝達する。
(3.1)弾性変形部
図5Bに示すように、弾性変形部43は、ティースコア4の内筒部41の一部に形成されている。弾性変形部43は、内筒部41の他の部分よりも剛性が小さく、弾性変形しやすい。上述したように、モータ1の製造工程において、ヨークコア5は、焼嵌め等によりティースコア4が内側に嵌め込まれており、ヨークコア5は、複数のティース42に対してヨークコア5の径方向内向きの接圧を加えている。また、各ティース42は、渡り配線23より張力を受けている。これらの要因により、ティースコア4の内筒部41は、周方向の力を受けており、特に、周方向の圧縮力を受けやすい。
図7に示すように、渡り配線23は、胴部421の径方向の内側の部分46に位置している。上述したように、ティースコア4は、内筒部41から内筒部41の径方向において外向きに突出した複数のティース42を有している。一本のステータ配線21は、一のティース42の胴部421に巻かれてコイル線22となり、次に、隣接するティース42に向けて這わせて渡り配線23となり、隣接するティース42の胴部421に巻いてコイル線22となり、これが全てのティース42に巻かれるまで繰り返される。このような作業は、ティースコア4が、内筒部41から径方向における外向きに突出した複数のティース42を有する構成であるため、行いやすい。すなわち、ティースが、ヨークコア5の径方向における内向きに突出するように構成されていると、ティースの先端側に広いスペースが形成されにくく、ティースにステータ配線を巻く作業が行いにくい。そこで、本実施形態では、ティース42が、内筒部41から径方向における外向きに突出する構成としたことにより、ティースの先端側が開放されて広いスペースが形成されやすく、ティース42にステータ配線21を巻く作業が行いやすくなる。
図6、図8に示すように、ステータコア20の表面200(第2インシュレータ62の表面60)のモータ端子71の周辺部に、ガイド支持部26が突設されている。
次に、実施形態の変形例を列挙する。以下の変形例は、適宜組み合わせて実現されてもよい。
以上、述べた本実施形態およびその変形例から明らかなように、第1の態様のモータ(1)は、ステータコア(20)及びステータ配線(21)を有するステータ(2)と、磁石を有しステータコア(20)に対して回転するロータ(3)と、を備える。ステータコア(20)は、ティースコア(4)と、ヨークコア(5)と、を有する。ティースコア(4)は、内側にロータ(3)が配置される筒状の内筒部(41)と、内筒部(41)から内筒部(41)の径方向において外向きに突出した胴部(421)を含む複数のティース(42)と、を有する。ヨークコア(5)は、複数のティース(42)に取り付けられ複数のティース(42)を囲む筒状をなす。ステータ配線(21)は、胴部(421)に巻かれるコイル線(22)と、複数の胴部(421)に巻かれるコイル線(22)同士を電気的に接続する渡り配線(23)と、を有する。渡り配線(23)は、胴部(421)の径方向の内側の部分に位置している。
10 電動工具
2 ステータ
20 ステータコア
21 ステータ配線
22 コイル線
23 渡り配線
24 保持部
25 側周面
3 ロータ
31 永久磁石
4 ティースコア
41 内筒部
42 ティース
421 胴部
5 ヨークコア
6 インシュレータ
Claims (3)
- ステータコア及びステータ配線を有するステータと、
磁石を有し前記ステータコアに対して回転するロータと、を備え、
前記ステータコアは、
内側に前記ロータが配置される筒状の内筒部と、前記内筒部から前記内筒部の径方向において外向きに突出した胴部を含む複数のティースと、を有するティースコアと、
前記複数のティースに取り付けられ前記複数のティースを囲む筒状のヨークコアと、を有し、
前記ステータ配線は、
前記胴部に巻かれるコイル線と、
複数の前記胴部に巻かれる複数の前記コイル線同士を電気的に接続する渡り配線と、を有し、
前記渡り配線は、前記胴部の前記径方向の内側の部分に位置している、
モータ。 - 前記ステータコアは、前記ティースコアを覆うインシュレータを更に備え、
前記インシュレータは、前記渡り配線の位置を保持する保持部を有する、
請求項1記載のモータ。 - 請求項1又は2に記載のモータを備える、
電動工具。
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EP22759209.4A EP4300776A4 (en) | 2021-02-26 | 2022-01-26 | ENGINE AND ELECTRIC TOOL |
CN202280011464.5A CN116746035A (zh) | 2021-02-26 | 2022-01-26 | 马达和电动工具 |
US18/546,737 US20240235306A1 (en) | 2021-02-26 | 2022-01-26 | Motor and electric tool |
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JP2021030831A JP2022131729A (ja) | 2021-02-26 | 2021-02-26 | モータ及び電動工具 |
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JP (1) | JP2022131729A (ja) |
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Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH1132463A (ja) | 1997-07-09 | 1999-02-02 | Sankyo Seiki Mfg Co Ltd | ディスク駆動モータ及びそのロータの製造方法 |
JP2010142075A (ja) * | 2008-12-15 | 2010-06-24 | Toyota Motor Corp | 固定子構造及び固定子製造方法 |
JP2010166643A (ja) * | 2009-01-13 | 2010-07-29 | Mitsubishi Electric Corp | 密閉型圧縮機及び冷凍サイクル装置 |
JP2013162726A (ja) * | 2012-02-08 | 2013-08-19 | Asmo Co Ltd | ステータ及びブラシレスモータ |
WO2014108942A1 (ja) * | 2013-01-10 | 2014-07-17 | パナソニック株式会社 | 整流子モータおよびその巻線の結線方法 |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE112012006257T5 (de) * | 2012-04-18 | 2015-03-05 | Mitsubishi Electric Corporation | Stator, Motor, Gebläse und Stator-Herstellungsverfahren |
-
2021
- 2021-02-26 JP JP2021030831A patent/JP2022131729A/ja active Pending
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2022
- 2022-01-26 WO PCT/JP2022/002912 patent/WO2022181167A1/ja active Application Filing
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Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH1132463A (ja) | 1997-07-09 | 1999-02-02 | Sankyo Seiki Mfg Co Ltd | ディスク駆動モータ及びそのロータの製造方法 |
JP2010142075A (ja) * | 2008-12-15 | 2010-06-24 | Toyota Motor Corp | 固定子構造及び固定子製造方法 |
JP2010166643A (ja) * | 2009-01-13 | 2010-07-29 | Mitsubishi Electric Corp | 密閉型圧縮機及び冷凍サイクル装置 |
JP2013162726A (ja) * | 2012-02-08 | 2013-08-19 | Asmo Co Ltd | ステータ及びブラシレスモータ |
WO2014108942A1 (ja) * | 2013-01-10 | 2014-07-17 | パナソニック株式会社 | 整流子モータおよびその巻線の結線方法 |
Non-Patent Citations (1)
Title |
---|
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CN116746035A (zh) | 2023-09-12 |
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