WO2022162758A1 - 電動工具及びモータ - Google Patents
電動工具及びモータ Download PDFInfo
- Publication number
- WO2022162758A1 WO2022162758A1 PCT/JP2021/002728 JP2021002728W WO2022162758A1 WO 2022162758 A1 WO2022162758 A1 WO 2022162758A1 JP 2021002728 W JP2021002728 W JP 2021002728W WO 2022162758 A1 WO2022162758 A1 WO 2022162758A1
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- WO
- WIPO (PCT)
- Prior art keywords
- rotor
- core
- outer peripheral
- stator
- steel plate
- Prior art date
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 191
- 239000010959 steel Substances 0.000 claims abstract description 191
- 230000002093 peripheral effect Effects 0.000 claims description 134
- 230000000717 retained effect Effects 0.000 claims 1
- 230000004048 modification Effects 0.000 description 55
- 238000012986 modification Methods 0.000 description 55
- 230000005415 magnetization Effects 0.000 description 32
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 14
- 230000004907 flux Effects 0.000 description 13
- 238000004519 manufacturing process Methods 0.000 description 10
- 238000004804 winding Methods 0.000 description 10
- 238000000605 extraction Methods 0.000 description 8
- 238000003780 insertion Methods 0.000 description 7
- 230000037431 insertion Effects 0.000 description 7
- 229910052742 iron Inorganic materials 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 6
- 239000000696 magnetic material Substances 0.000 description 6
- 239000000853 adhesive Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000001070 adhesive effect Effects 0.000 description 4
- 238000010030 laminating Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 229910001224 Grain-oriented electrical steel Inorganic materials 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 229920002050 silicone resin Polymers 0.000 description 2
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- 229910000565 Non-oriented electrical steel Inorganic materials 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 229910001172 neodymium magnet Inorganic materials 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Images
Classifications
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/02—Details of the magnetic circuit characterised by the magnetic material
-
- 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
- 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
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
-
- 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
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
- H02K1/2766—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect
-
- 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
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
- H02K1/2766—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect
- H02K1/2773—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect consisting of tangentially magnetized radial magnets
-
- 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
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
Definitions
- the present disclosure relates generally to power tools and motors, and more particularly to motors having stators and rotors and power tools including the same.
- a brushless motor described in Patent Document 1 includes an electric motor rotor, a motor case, and a stator.
- the motor case rotatably supports the rotor for the electric motor.
- the stator is fixed in the motor case and wound with windings through which current is supplied.
- An object of the present disclosure is to provide an electric power tool and this motor that can increase the torque of the motor.
- a power tool includes a motor.
- the motor has a stator and a rotor.
- the rotor rotates with respect to the stator.
- At least one of the stator and the rotor includes a core including grain-oriented steel.
- a motor has a stator and a rotor.
- the rotor rotates with respect to the stator.
- At least one of the stator and the rotor includes a core including grain-oriented steel.
- FIG. 1 is a plan view of a motor according to one embodiment.
- FIG. 2 is a side sectional view of the same motor.
- FIG. 3 is a schematic diagram of a power tool having the same motor.
- FIG. 4 is a plan view of the same motor.
- 5A and 5B are diagrams showing a method of manufacturing the same motor.
- FIG. 6 is a diagram showing a method of manufacturing the same motor.
- 7A is a plan view of a motor according to Modification 1.
- FIG. FIG. 8 is a plan view of a main part of a motor according to Modification 2.
- FIG. 9 is a plan view of a main part of a motor according to Modification 3.
- FIG. 10A is a plan view of a main part of a motor according to Modification 4.
- FIG. 10B is a side cross-sectional view of a main part of the same motor.
- 11 is a plan view of a main part of a motor according to Modification 5.
- FIG. 12 is a plan view of a rotor of a motor according to Modification 6.
- FIG. 13 is a plan view of a rotor of a motor according to modification 7.
- FIG. 14 is a side view of a main part of a motor according to Modification 10.
- FIG. 10A is a plan view of a main part of a motor according to Modification 4.
- FIG. 10B is a side cross-sectional view of a main part of the same motor.
- 11 is a plan view of a main part of a motor according to Modification 5.
- FIG. 12 is a plan view of a rot
- An electric power tool 10 (see FIG. 3) of this embodiment includes a motor 1 as shown in FIGS.
- a motor 1 has a stator 2 and a rotor 5 .
- Rotor 5 rotates relative to stator 2 .
- At least one of the stator 2 and rotor 5 comprises a core comprising grain-oriented steel sheets.
- the stator 2 includes a stator core 20 containing grain-oriented steel plates
- the rotor 5 includes a rotor core 6 containing grain-oriented steel plates.
- the torque of the motor 1 can be increased as compared with the case where the cores (the stator core 20 and the rotor core 6) include only non-oriented steel plates.
- the power tool 10 includes a motor 1, a power source 101, a drive transmission section 102, an output shaft 103, a chuck 104, a tip tool 105, a trigger volume 106, A control unit 107 and a housing 108 are provided.
- the power tool 10 drives the tip tool 105 with the driving force of the motor 1 .
- the housing 108 accommodates the motor 1, the drive transmission section 102, the output shaft 103, and the control section 107.
- the motor 1 is a drive source that drives the tip tool 105 .
- a power supply 101 is a DC power supply that supplies a current for driving the motor 1 .
- Power supply 101 is, for example, a battery pack.
- a battery pack includes one or more secondary batteries.
- the rotor 5 has an output shaft 51 (rotating shaft), and the driving force of the motor 1 (torque of the rotor 5) is transmitted to the drive transmission section 102 via the output shaft 51.
- the drive transmission unit 102 adjusts the driving force of the motor 1 and outputs it to the output shaft 103 .
- the output shaft 103 is driven (for example, rotated) by the driving force output from the drive transmission section 102 .
- Chuck 104 is fixed to output shaft 103 .
- a tip tool 105 is detachably attached to the chuck 104 .
- the tip tool 105 (also referred to as a bit) is, for example, a driver, socket, drill, or the like.
- the tip tool 105 corresponding to the application is attached to the chuck 104 and used.
- the control unit 107 is a circuit that controls the current supplied from the power supply 101 to the multiple coils 23 (see FIG. 1) of the motor 1. Thereby, the control unit 107 controls the rotation speed of the rotor 5 of the motor 1 .
- the trigger volume 106 is an operation unit that receives an operation for controlling the rotation of the rotor 5 of the motor 1.
- the motor 1 By pulling the trigger volume 106, the motor 1 can be turned on and off. Further, by adjusting the amount of operation for pulling the trigger volume 106, the rotational speed of the rotor 5 can be adjusted. That is, by adjusting the amount of operation for pulling the trigger volume 106, the rotational speed of the output shaft 103 that rotates in conjunction with the rotation of the rotor 5 can be adjusted.
- the control unit 107 rotates or stops the rotor 5 and controls the rotational speed of the rotor 5 according to the operation input to the trigger volume 106 . In this power tool 10 , the tip tool 105 is attached to the chuck 104 . By controlling the rotational speed of the rotor 5 by operating the trigger volume 106, the rotational speeds of the output shaft 103 and the tip tool 105 are controlled.
- the power tool 10 of this embodiment includes 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 .
- the motor 1 of this embodiment is a brushless motor. As shown in FIGS. 1 and 2, the motor 1 has a rotor 5 and a stator 2 .
- the rotor 5 has a rotor core 6 , a plurality of (ten in FIG. 1 ) permanent magnets 7 , and an output shaft 51 .
- a plurality of permanent magnets 7 are held by the rotor core 6 .
- the stator 2 has a stator core 20 and a plurality of (12 in FIG. 1) coils 23 .
- Stator core 20 is arranged around rotor core 6 . That is, stator core 20 surrounds rotor core 6 .
- a plurality of coils 23 are wound around the stator core 20 .
- Rotor 5 rotates relative to stator 2 .
- the rotor 5 rotates when the magnetic flux generated from the plurality of coils 23 acts on the plurality of permanent magnets 7 .
- Torque (driving force) of the rotor 5 is transmitted from the output shaft 51 to the drive transmission portion 102 (see FIG. 3).
- Each of the stator core 20 and rotor core 6 includes a plurality of steel plates.
- Each of stator core 20 and rotor core 6 is formed by laminating a plurality of steel plates in the thickness direction. That is, each of stator core 20 and rotor core 6 is a so-called laminated core.
- the plurality of steel plates are bonded, for example, with steel plates that are adjacent to each other in the thickness direction.
- the stacking direction of the plurality of steel plates is along the axial direction of the output shaft 51 of the rotor 5 (the length direction of the output shaft 51).
- Each steel plate is more specifically an electromagnetic steel plate.
- Each steel plate is made of a magnetic material.
- Each steel plate is, for example, a silicon steel plate.
- the stator core 20 of the stator 2 has a central core 21 and an outer peripheral portion 22 .
- the central core 21 has a cylindrical inner cylindrical portion 3 and a plurality of teeth 4 (12 in FIG. 1).
- a rotor core 6 is arranged inside the inner cylindrical portion 3 .
- Each of the multiple teeth 4 includes a trunk portion 41 and a convex portion 42 .
- the trunk portion 41 protrudes outward from the inner tubular portion 3 in the radial direction of the inner tubular portion 3 .
- the body portions 41 of the plurality of teeth 4 are provided at regular intervals in the circumferential direction of the inner cylindrical portion 3 (rotational direction of the rotor 5).
- the convex portion 42 protrudes from the tip of the trunk portion 41 . When viewed from the axial direction of the output shaft 51 of the rotor 5 , the convex portion 42 has a trapezoidal shape whose width increases with increasing distance from the body portion 41 .
- the stator 2 has a coil winding frame 8 (see FIG. 2). 1, illustration of the coil winding frame 8 is omitted.
- the coil winding frame 8 is made of synthetic resin, for example.
- the coil winding frame 8 has electrical insulation.
- the coil winding frame 8 covers a region of the plurality of teeth 4 including the trunk portion 41 .
- a coil 23 is wound around each body portion 41 from above the coil winding frame 8 . That is, the plurality (12 pieces) of coils 23 correspond to the plurality (12 pieces) of teeth 4 on a one-to-one basis, and each coil 23 is wound around the corresponding tooth 4 from above the coil winding frame 8 .
- the shape of the outer peripheral portion 22 is cylindrical.
- the shape of the outer peripheral portion 22 of this embodiment is a rectangular tube. More specifically, when viewed from the axial direction of the outer peripheral portion 22, the outer peripheral shape of the outer peripheral portion 22 is a regular dodecagon.
- side of the outer peripheral part 22 is called the outer peripheral piece 220.
- the outer peripheral portion 22 includes a plurality of (twelve) outer peripheral pieces 220 . When viewed from the axial direction of the output shaft 51, the outer peripheral piece 220 has a rectangular shape.
- the outer peripheral portion 22 is attached to a plurality of teeth 4 of the central core 21 so as to surround the central core 21 .
- the outer peripheral portion 22 surrounds the rotor core 6 arranged inside the central core 21 .
- the plurality of teeth 4 of the central core 21 are provided so as to protrude from the outer peripheral portion 22 toward the rotor core 6 .
- the outer peripheral portion 22 has a plurality of (twelve) recesses 221 . That is, the outer peripheral portion 22 has the same number of recesses 221 as the teeth 4 .
- Each of the plurality of recesses 221 is a depression provided on the inner peripheral surface of the outer peripheral portion 22 .
- Each of the plurality of recesses 221 is provided on each of the plurality of outer peripheral pieces 220 .
- the plurality of recesses 221 are provided at regular intervals in the circumferential direction of the outer peripheral portion 22 .
- the concave portion 221 When viewed from the axial direction of the output shaft 51 of the rotor 5, the concave portion 221 has a trapezoidal shape with a width that increases toward the outside.
- the multiple recesses 221 correspond to the multiple teeth 4 on a one-to-one basis.
- Each of the plurality of recesses 221 is fitted with the protrusion 42 of the tooth 4 corresponding to this recess 221 among the plurality of teeth 4 .
- the outer peripheral portion 22 is attached to the plurality of teeth 4 .
- the stator core 20 (core) is split into a plurality of split cores.
- each of the central core 21 and the outer peripheral portion 22 is a split core. That is, the stator core 20 includes a plurality of split cores that are split when viewed from the axial direction of the rotating shaft (output shaft 51) of the rotor 5. As shown in FIG. A plurality of split cores are connected to each other. The plurality of split cores of stator core 20 are connected by being fitted together. That is, the central core 21 and the outer peripheral portion 22 are connected by fitting the convex portion 42 of the central core 21 and the concave portion 221 of the outer peripheral portion 22 to each other.
- Rotor The rotor core 6 of the rotor 5 is formed in a cylindrical shape concentric with the inner cylindrical portion 3 of the stator core 20 .
- the thickness of the rotor core 6 and the thickness of the stator core 20 are equal.
- the term “equal” is not limited to being exactly the same, but also includes being different within a permissible range of error.
- An output shaft 51 is held inside the rotor core 6 .
- the rotor core 6 and the output shaft 51 rotate together.
- the rotor core 6 has a shaft holding portion 61 having a shaft hole 611 through which the output shaft 51 is passed, and a rotor body 62 surrounding the shaft holding portion 61 .
- the shape of the shaft holding portion 61 is cylindrical.
- a cylindrical space inside the shaft holding portion 61 is a shaft hole 611 .
- the outer shape of the shaft holding portion 61 is a regular decagon.
- the shaft holding portion 61 has a plurality of (10 in FIG. 1) recesses 612 .
- Each of the plurality of recesses 612 is a depression provided on the outer peripheral surface of shaft holding portion 61 .
- the plurality of recesses 612 are provided at regular intervals in the circumferential direction of the shaft holding portion 61 .
- the concave portion 612 When viewed from the axial direction of the output shaft 51 of the rotor 5, the concave portion 612 has a trapezoidal shape with a larger width toward the shaft hole 611 side.
- the shaft holding portion 61 in this embodiment is made of a magnetic material, the shaft holding portion 61 may be made of a non-magnetic material.
- the shape of the rotor body 62 is a cylindrical shape concentric with the shaft holding portion 61 .
- the rotor body 62 includes a plurality of fan-shaped portions 621 (10 in FIG. 1). When viewed from the axial direction of the output shaft 51 , each of the plurality of fan-shaped portions 621 has a fan-like shape that widens toward the outer side in the radial direction of the output shaft 51 (the radial direction of the rotor core 6 ). Further, the rotor body 62 has convex portions 622 protruding from each of the plurality of fan-shaped portions 621 . That is, the rotor body 62 has a plurality of (10 in FIG. 1) convex portions 622 .
- Each of the plurality of convex portions 622 protrudes from the end of the fan-shaped portion 621 on the output shaft 51 side.
- the plurality of protrusions 622 are fitted into the recesses 612 of the shaft holding portion 61 .
- each of the plurality of fan-shaped portions 621 is connected to the shaft holding portion 61 .
- a rotor body 62 is formed by arranging a plurality of fan-shaped portions 621 in an annular shape around the shaft holding portion 61 .
- the plurality of fan-shaped portions 621 are provided at regular intervals in the rotation direction of the rotor core 6 (the circumferential direction of the rotor core 6).
- the rotor core 6 is split into a plurality of split cores.
- each of the shaft holding portion 61 and the rotor body 62 is a split core. That is, the rotor core 6 includes a plurality of divided cores divided when viewed from the axial direction of the rotating shaft (output shaft 51) of the rotor 5. As shown in FIG. A plurality of split cores are connected to each other. A plurality of split cores of the rotor core 6 are connected by being fitted to each other. That is, the shaft holding portion 61 and the rotor body 62 are connected by fitting the concave portion 612 of the shaft holding portion 61 and the convex portion 622 of the rotor body 62 to each other.
- a plurality of permanent magnets 7 are arranged in the gaps between the fan-shaped portions 621 . That is, two fan-shaped portions 621 adjacent to each other sandwich the permanent magnet 7 therebetween.
- Two holding protrusions 623 protrude from each of the plurality of fan-shaped portions 621 . That is, the rotor body 62 includes the holding protrusions 623 twice as many as the fan-shaped portions 621 (20 pieces).
- Two holding protrusions 623 protrude in the circumferential direction from the radially outer (the stator core 20 side) end of each fan-shaped portion 621 .
- Each holding projection 623 holds a permanent magnet 7 .
- each permanent magnet 7 is arranged radially inward of the rotor core 6 relative to the holding projections 623 protruding from each of the two fan-shaped portions 621 arranged on both sides thereof. The radially outward movement of the rotor core 6 is restricted.
- the rotor core 6 accommodates a plurality of permanent magnets 7 . That is, the motor 1 has a so-called interior permanent magnet (IPM) structure in which a plurality of permanent magnets 7 are embedded inside the rotor core 6 .
- IPM interior permanent magnet
- Each of the plurality of permanent magnets 7 is held in the rotor core 6 by, for example, being embedded in the rotor core 6 with an adhesive applied.
- each permanent magnet 7 is rectangular parallelepiped. When viewed from the axial direction of the rotor core 6, each permanent magnet 7 has a rectangular shape.
- each permanent magnet 7 for example, a neodymium magnet, a ferrite magnet, or a plastic magnet can be used.
- the plurality of permanent magnets 7 are arranged in a spoke shape (radially) around the center of the rotor core 6 (shaft hole 611). That the plurality of permanent magnets 7 are arranged in a spoke shape around the center of the rotor core 6 means that the longitudinal direction of each permanent magnet 7 is along the radial direction of the rotor core 6 when viewed from the axial direction of the rotor core 6 and that the plurality of permanent magnets 7 are arranged so as to line up in the circumferential direction of the rotor core 6 .
- the plurality of permanent magnets 7 are arranged at regular intervals in the circumferential direction of the rotor core 6 .
- the permanent magnets 7 adjacent to each other in the circumferential direction of the rotor core 6 have the same poles opposed to each other. Therefore, each of the fan-shaped portions 621 functions as a virtual magnetic pole (outlet and intake of magnetic flux) in the rotor core 6 .
- virtual N poles and S poles alternately exist at each position where the fan-shaped portion 621 is provided.
- the motor 1 further includes an end plate 9 and two bearings 52 .
- a bottomed cylindrical cover is attached to the end plate 9 .
- a housing is composed of the end plate 9 and the cover.
- the stator 2 and rotor 5 are housed in a space surrounded by the end plate 9 and the cover.
- One of the two bearings 52 is fixed to the cover and the other is fixed to the end plate 9 .
- Two bearings 52 rotatably hold the output shaft 51 of the rotor 5 .
- each of the stator core 20 and the rotor core 6 includes a plurality of steel plates.
- a plurality of steel plates of rotor core 6 will be described.
- rotor core 6 includes a plurality of steel plates 601 and a plurality of steel plates 602 .
- a plurality of steel plates 601 are laminated in the thickness direction.
- the plurality of steel plates 601 have the same shape as each other.
- a plurality of steel plates 601 constitute the shaft holding portion 61 of the rotor core 6 .
- a plurality of steel plates 602 are laminated in the thickness direction.
- the plurality of steel plates 602 have the same shape as each other.
- a plurality of steel plates 602 constitute a rotor body 62 of the rotor core 6 .
- the plurality of steel plates 602 are divided into 10 portions that configure each of the plurality (10) of fan-shaped portions 621 .
- the plurality of steel plates 601 are non-oriented steel plates. More specifically, the plurality of steel plates 601 are non-oriented electrical steel plates.
- a non-oriented steel sheet has a substantially constant magnetic resistivity in all directions perpendicular to the thickness direction.
- the plurality of steel plates 602 are oriented steel plates. More specifically, the plurality of steel plates 602 are grain-oriented electrical steel plates. That is, of the stator 2 and the rotor 5, the rotor 5 has a core (rotor core 6) including a oriented steel plate (steel plate 602) and a non-oriented steel plate (steel plate 601).
- the direction of easy magnetization of the rotor body 62 made of grain-oriented steel is indicated by a double-headed arrow A1 on the fan-shaped portion 621.
- the rotor body 62 is easily magnetized in the direction along the double arrow A1.
- the direction of easy magnetization is, in other words, the direction in which the magnetic resistivity is minimized.
- the direction of easy magnetization is along the rolling direction of the steel sheet when the steel sheet is manufactured.
- the direction of easy magnetization in the rotor body 62 is different for each of the plurality of fan-shaped portions 621 forming the rotor body 62 .
- the direction of easy magnetization of the rotor body 62 is along the radial direction (the radial direction of the rotor core 6 ) with respect to the output shaft 51 when viewed from the axial direction of the rotating shaft (output shaft 51 ) of the rotor 5 .
- the steel plate 602 which is the oriented steel plate of the rotor core 6 (core) includes the following radial portions. In the radial portion, when viewed from the axial direction of the rotation shaft (output shaft 51) of the rotor 5, the direction in which the magnetic resistivity is minimized is along the radial direction with respect to the rotation shaft (output shaft 51).
- the entire steel plate 602 corresponds to the radial portion.
- stator core 20 includes a plurality of steel plates 201 and a plurality of steel plates 202 .
- a plurality of steel plates 201 are laminated in the thickness direction.
- the plurality of steel plates 201 have the same shape as each other.
- a plurality of steel plates 201 constitute central core 21 of stator core 20 .
- a plurality of steel plates 202 are laminated in the thickness direction.
- the plurality of steel plates 202 have the same shape as each other.
- a plurality of steel plates 202 constitute the outer peripheral portion 22 of the stator core 20 .
- the plurality of steel plates 201 are oriented steel plates.
- the plurality of steel plates 202 are oriented steel plates. More specifically, the plurality of steel plates 201 and the plurality of steel plates 202 are grain oriented electrical steel plates.
- FIG. 4 the direction of easy magnetization of the central core 21 made of grain-oriented steel is illustrated by a double arrow A2 on the central core 21 .
- the central core 21 is easily magnetized in the direction along the double arrow A2.
- the direction of easy magnetization in central core 21 is different for each of a plurality of teeth 4 forming central core 21 .
- the direction of easy magnetization of the central core 21 is along the radial direction (the radial direction of the rotor core 6) with respect to the output shaft 51 when viewed from the axial direction of the rotating shaft (output shaft 51) of the rotor 5.
- the steel plate 201 which is the oriented steel plate of the stator core 20 (core) includes the following radial portion. In the radial portion, when viewed from the axial direction of the rotation shaft (output shaft 51) of the rotor 5, the direction in which the magnetic resistivity is minimized is along the radial direction with respect to the rotation shaft (output shaft 51).
- the entire steel plate 201 corresponds to the radial portion.
- each of the plurality of teeth 4 includes a oriented steel plate (steel plate 201) as follows.
- the magnetic resistivity of steel plate 201 in the radial direction of outer peripheral portion 22 is smaller than the magnetic resistivity of steel plate 201 in the circumferential direction of outer peripheral portion 22 .
- the direction of easy magnetization of the outer peripheral portion 22 made of a grain-oriented steel plate is illustrated by a double arrow A3 on the outer peripheral portion 22.
- the outer peripheral portion 22 is easily magnetized in the direction along the double arrow A3.
- the direction of easy magnetization in outer peripheral portion 22 is different for each of the plurality of outer peripheral pieces 220 forming outer peripheral portion 22 .
- the direction of easy magnetization in each of the plurality of outer peripheral pieces 220 of the outer peripheral portion 22 is along the length direction of the outer peripheral piece 220 .
- the length direction of each outer peripheral piece 220 corresponds to the circumferential direction of the outer peripheral portion 22 .
- the outer peripheral portion 22 includes a oriented steel plate (steel plate 202) as follows.
- the magnetic resistivity of the steel plate 202 in the circumferential direction of the outer peripheral portion 22 is smaller than the magnetic resistivity of the steel plate 202 in the radial direction of the outer peripheral portion 22 .
- the magnetic flux generated by each of the plurality of permanent magnets 7 moves inside the rotor body 62 (sectoral portion 621 ) in the radial direction of the rotor core 6 and reaches the stator core 20 .
- the direction of easy magnetization in the rotor body 62 is along the radial direction of the rotor core 6 (radial direction with respect to the output shaft 51). That is, the direction of easy magnetization is along the direction of the magnetic flux. Therefore, iron loss in the rotor body 62 can be reduced as compared with the case where the rotor body 62 includes only non-oriented steel plates.
- the magnetic flux generated in the rotor core 6 moves in the radial direction of the outer peripheral portion 22 inside the plurality of teeth 4 of the central core 21 of the stator core 20 and reaches the outer peripheral portion 22 .
- the direction of easy magnetization in the central core 21 is along the radial direction of the outer peripheral portion 22 (the radial direction with respect to the output shaft 51). That is, the direction of easy magnetization is along the direction of the magnetic flux. Therefore, iron loss in the central core 21 can be reduced as compared with the case where the central core 21 includes only non-oriented steel plates.
- the magnetic flux that has reached the outer peripheral portion 22 from the plurality of teeth 4 moves in the circumferential direction of the outer peripheral portion 22 and reaches the rotor core 6 via the plurality of teeth 4 .
- the direction of easy magnetization in the outer peripheral portion 22 is along the circumferential direction of the outer peripheral portion 22 . That is, the direction of easy magnetization is along the direction of the magnetic flux. Therefore, iron loss in the outer peripheral portion 22 can be reduced compared to the case where the outer peripheral portion 22 includes only the non-oriented steel plate.
- the torque of the motor 1 can be increased. More specifically, when the magnitude of the electric current to be applied to the plurality of coils 23 is determined, the torque obtained by this electric current can be increased.
- the outer peripheral portion 22 As a material for the steel plate 202 forming the outer peripheral portion 22 of the stator core 20, a material that is easily magnetized in one direction is procured. A plurality of these members are laminated and punched or the like to form an outer peripheral portion 22 as shown in FIG. 5A.
- the outer peripheral portion 22 is first formed in a rectangular shape. That is, the outer peripheral portion 22 is formed in a state in which a plurality of outer peripheral pieces 220 are linearly connected in the direction of easy magnetization (the direction of the double-headed arrow A3). By bending the boundary portions of the plurality of outer peripheral pieces 220 from this state, the shape of the outer peripheral portion 22 becomes a cylindrical shape as shown in FIG.
- the outer peripheral portion 22 has a final shape when used in the motor 1 .
- the outer peripheral piece 220 at the first end and the outer peripheral piece 220 at the second end may be connected by being fitted to each other by, for example, unevenness.
- the central core 21 is first formed so that the inner tubular portion 3 is straight. That is, the central core 21 is formed in a state in which a plurality of teeth 4 are connected in one direction via the inner cylindrical portion 3 . At this time, the direction in which the plurality of teeth 4 are arranged is perpendicular to the direction of easy magnetization (the direction of the double-headed arrow A2).
- the inner tubular portion 3 is bent between the plurality of teeth 4, so that the shape of the inner tubular portion 3 becomes a cylindrical shape as shown in FIG. Furthermore, by connecting the first end in the circumferential direction of the inner cylindrical portion 3 and the second end on the side opposite to the first end by welding or the like, the central core 21 can be the final end when it is used in the motor 1 . shape.
- the first end and the second end in the circumferential direction of the inner cylindrical portion 3 may be connected by being fitted to each other by, for example, unevenness.
- the outer peripheral portion 22 and the central core 21 are assembled as described above (or in parallel with the assembly of the outer peripheral portion 22 and the central core 21), the outer peripheral portion 22 and the central core 21 are arranged in the concave portion 221 and the convex portion 42. They are connected by being fitted together. Thereby, the stator core 20 is completed.
- the rotor core 6 is manufactured as follows. First, the fan-shaped portions 621 of the rotor body 62 are individually manufactured. After that, each of the plurality of fan-shaped portions 621 and the shaft holding portion 61 are connected by being fitted to each other at the concave portion 612 and the convex portion 622 .
- a positioning jig 500 is used in the next step, that is, the step of inserting the plurality of permanent magnets 7 into the rotor core 6 .
- the positioning jig 500 has a cylindrical portion 501 and a plurality of (ten in FIG. 6) projections 502 .
- a plurality of protrusions 502 protrude from the inner surface of the cylindrical portion 501 .
- the positioning jig 500 is arranged around the fan-shaped portions 621 .
- the multiple protrusions 502 of the positioning jig 500 correspond to the multiple permanent magnets 7 on a one-to-one basis.
- Each protrusion 502 contacts two retaining protrusions 623 provided outside the area in which the corresponding permanent magnet 7 is arranged.
- the plurality of fan-shaped portions 621 are positioned between the shaft holding portion 61 and the positioning jig 500 .
- a plurality of permanent magnets 7 are inserted into the gaps between the fan-shaped portions 621 .
- the plurality of fan-shaped portions 621 and the plurality of permanent magnets 7 are adhered with an adhesive. Thereby, the plurality of fan-shaped portions 621 are fixed.
- the positioning jig 500 is removed from the rotor 5 . Thereby, the rotor core 6 is completed.
- Modification 1 of the embodiment will be described below with reference to FIGS. 7A and 7B. Configurations similar to those of the embodiment are denoted by the same reference numerals, and descriptions thereof are omitted.
- the motor 1 of Modification 1 differs from the embodiment in that the rotor core 6 is integrally connected at the outer peripheral portion. That is, each of the fan-shaped portions 621 of the rotor core 6 is connected to the adjacent fan-shaped portion 621 via the holding protrusions 623 provided on the outer peripheral portion.
- the holding protrusions 623 are provided in the same number as the fan-shaped portions 621 (10 in FIG. 7A).
- the rotor core 6 can be easily assembled compared to the case where the plurality of fan-shaped portions 621 are separated from each other as in the embodiment. Become.
- the term “separated” as used in the present disclosure includes not only a state in which a plurality of members are cut from one member and manufactured, but also a state in which a plurality of members are manufactured from the beginning. An example of a method for manufacturing the rotor core 6 will be described below with reference to FIG. 7B.
- a material that is easily magnetized in one direction is procured.
- a plurality of these members are stacked and stamped or the like to form a rotor body 62 as shown in FIG. 7B.
- the rotor body 62 is first formed with a plurality of fan-shaped portions 621 connected in one direction via a plurality of holding projections 623 . That is, the plurality of fan-shaped portions 621 and the plurality of holding protrusions 623 are formed as one member.
- the direction in which the fan-shaped portions 621 are arranged is perpendicular to the direction of easy magnetization (the direction of the double-headed arrow A1).
- the shape of the rotor body 62 becomes a shape in which a plurality of fan-shaped portions 621 are arranged in a circle, as shown in FIG. 7A. Furthermore, the rotor body 62 is connected to the first end in the circumferential direction of the rotor body 62 and the second end on the side opposite to the first end by welding or the like, so that the rotor body 62 can be finally used in the motor 1. shape. Note that the first end and the second end in the circumferential direction of the rotor body 62 may be connected by being fitted to each other by, for example, projections and depressions.
- shaft holding portion 61 and the rotor body 62 are connected by being fitted to each other at the concave portion 612 and the convex portion 622 .
- At least two fan-shaped portions 621 and at least two holding projections 623 are not formed as one member, but all fan-shaped portions 621 and all holding projections 623 are formed as one member. It may be formed as one member.
- a member which is easily magnetized in one direction is procured as a member from which the steel plate 602 is made.
- a plurality of these members are stacked and stamped or the like to form a member in which two fan-shaped portions 621 are connected via a holding projection 623 as shown in FIG. 7C.
- FIG. 7C By forming a plurality of members shown in FIG. 7C and connecting them via holding projections 623, it is possible to form a rotor body 62 in which a plurality of fan-shaped portions 621 are arranged in a circle as shown in FIG. 7A. .
- Modification 2 of the embodiment will be described below with reference to FIG. Configurations similar to those of the embodiment are denoted by the same reference numerals, and descriptions thereof are omitted.
- the rotor body 62 has a plurality of recesses 624 formed in a plurality of fan-shaped portions 621 instead of the plurality of projections 622 .
- the rotor core 6 has a plurality of protrusions 613 projecting from the shaft holding portion 61 instead of the plurality of recesses 612 formed in the shaft holding portion 61 .
- the shaft holding portion 61 and the rotor body 62 are connected by being fitted to each other at the concave portion 624 and the convex portion 613 .
- the shaft holding portion 61 may be made of a non-magnetic material.
- the shaft holding portion 61 may be made of a non-magnetic material.
- Modification 3 of the embodiment will be described below with reference to FIG. Configurations similar to those of the embodiment are denoted by the same reference numerals, and descriptions thereof are omitted.
- the outer peripheral portion 22 of Modification 3 has a plurality of protrusions 222 and a plurality of recesses 223 . More specifically, convex portions 222 and concave portions 223 are provided at both ends in the length direction of each of the plurality of outer peripheral pieces 220 (both ends in the circumferential direction of the outer peripheral portion 22). That is, a convex portion 222 protrudes from the first end of each of the plurality of outer peripheral pieces 220 . A recess 223 is provided at the second end of each of the plurality of outer peripheral pieces 220 .
- the plurality of outer peripheral pieces 220 are connected by being fitted to each other at the convex portion 222 and the concave portion 223 after being separated from each other.
- the stator core 20 (core) is split into a plurality of split cores.
- the central core 21 and each of the plurality of outer peripheral pieces 220 are split cores. That is, the stator core 20 includes a plurality of split cores that are split when viewed from the axial direction of the rotating shaft (output shaft 51) of the rotor 5. As shown in FIG. A plurality of split cores are connected to each other.
- the plurality of split cores of stator core 20 are connected by being fitted together. That is, the plurality of outer peripheral pieces 220 are connected by fitting the protrusions 222 and the recesses 223 to each other.
- the central core 21 and the outer peripheral portion 22 are connected by fitting the convex portion 42 of the central core 21 and the concave portion 221 of the outer peripheral portion 22 to each other.
- Modification 4 of the embodiment will be described below with reference to FIGS. 10A and 10B. Configurations similar to those of the embodiment are denoted by the same reference numerals, and descriptions thereof are omitted.
- the cross-sectional shape of the distal end of the insertion member 401 may be triangular.
- an elastic body such as rubber or a cushioning member such as urethane foam may be used.
- a filler, coating agent, adhesive agent, or sealing agent made of silicone resin or the like may be used.
- the insertion member 401 may be inserted into a gap formed between the concave portion 612 and the convex portion 622 of the rotor core 6 .
- Modification 5 of the embodiment will be described below with reference to FIG. Configurations similar to those of the embodiment are denoted by the same reference numerals, and descriptions thereof are omitted.
- the motor 1 of Modification 5 differs from the embodiment in that it includes a filling portion 402 .
- the filling part 402 fills the gaps around the plurality of split cores.
- the filling part 402 is, for example, a filler made of silicone resin or the like, a coating agent, an adhesive, or a sealing agent.
- the area where the filling portion 402 is provided is indicated by dots.
- the central core 21 and the outer peripheral portion 22 each correspond to split cores.
- the filling portion 402 is provided in a space (gap) surrounded by the plurality of teeth 4 of the central core 21 and the outer peripheral portion 22 . This reduces the possibility of looseness occurring between the plurality of teeth 4 and the outer peripheral portion 22 .
- Modification 6 of the embodiment will be described below with reference to FIG. Configurations similar to those of the embodiment are denoted by the same reference numerals, and descriptions thereof are omitted.
- the rotor 5 of Modification 6 has 12 permanent magnets 7 .
- the 12 permanent magnets 7 are arranged outside the shaft holding portion 61 in the rotor core 6 .
- the rotor body 62 includes six extracting portions 625 instead of the fan-shaped portions 621 .
- the six extracting portions 625 are configured to correspond to the plurality of fan-shaped portions 621 .
- Each of the six outlets 625 functions as a virtual magnetic pole (magnetic flux outlet and inlet) in the rotor core 6 .
- the six extracting portions 625 are arranged in the circumferential direction of the rotor core 6 . In the circumferential direction of the rotor core 6, virtual N poles and S poles alternately exist at each position where the extraction portion 625 is provided.
- Each extractor 625 is adjacent to three permanent magnets 7 . That is, one permanent magnet 7 is arranged between each extraction portion 625 and the output shaft 51 of the rotor 5 . Permanent magnets 7 are arranged on both sides of the rotor core 6 in the circumferential direction with respect to each extracting portion 625 .
- each extraction portion 625 is along the radial direction (the radial direction of the rotor core 6) with respect to the output shaft 51 when viewed from the axial direction of the rotating shaft (output shaft 51) of the rotor 5. .
- Modification 7 of the embodiment will be described below with reference to FIG. Configurations similar to those of the embodiment are denoted by the same reference numerals, and descriptions thereof are omitted.
- the rotor 5 of Modification 7 has 16 permanent magnets 7 .
- the 16 permanent magnets 7 are arranged outside the shaft holding portion 61 in the rotor core 6 .
- the rotor main body 62 includes eight extraction portions 626 instead of the plurality of fan-shaped portions 621 .
- the six extracting portions 626 are configured to correspond to the plurality of fan-shaped portions 621 .
- Each of the eight outlets 626 functions as a virtual magnetic pole (magnetic flux outlet and inlet) in the rotor core 6 .
- the six extracting portions 626 are arranged in the circumferential direction of the rotor core 6 . In the circumferential direction of the rotor core 6, virtual N poles and S poles alternately exist at each position where the extraction portion 626 is provided.
- Each extractor 626 is adjacent to two permanent magnets 7 . That is, each extracting portion 626 is sandwiched between two permanent magnets 7 arranged in a V shape.
- each extraction portion 626 is along the radial direction (the radial direction of the rotor core 6) with respect to the output shaft 51 when viewed from the axial direction of the rotating shaft (output shaft 51) of the rotor 5. .
- each extraction portion 626 is the direction of the magnetic flux generated by the plurality of permanent magnets 7, as in the embodiment. along the Therefore, iron loss in the rotor body 62 can be reduced.
- Modification 8 of the embodiment will be described below with reference to FIG. Configurations similar to those of the embodiment are denoted by the same reference numerals, and descriptions thereof are omitted.
- At least one of the rotor core 6 (core) and the stator core 20 (core) includes the following inclined portions.
- the direction in which the magnetic resistivity is minimized when viewed from the axial direction of the rotating shaft (output shaft 51) of the rotor 5 is oblique to the radial direction with respect to the rotating shaft (output shaft 51).
- the oriented steel plate (steel plate 602) of the rotor core 6 includes an inclined portion
- the direction of easy magnetization is along the radial direction indicated by the double arrow A1.
- the direction of easy magnetization is the direction of the double arrow A6 oblique to the radial direction.
- the steel plate 602 includes an inclined portion whose direction of easy magnetization is the direction of the double arrow A6.
- the entire steel plate 602 corresponds to the inclined portion.
- the oriented steel plate (steel plate 201) of the stator core 20 includes an inclined portion
- the direction of easy magnetization is along the radial direction indicated by the double arrow A2.
- the direction of easy magnetization is the direction of the double arrow A7 oblique to the radial direction.
- the steel plate 201 includes an inclined portion whose direction of easy magnetization is the direction of the double arrow A7.
- the entire steel plate 201 corresponds to the inclined portion.
- the inclination of the double arrow A6 with respect to the radial direction is equal to the inclination of the double arrow A7 with respect to the radial direction.
- the rotor 5 rotates in one direction compared to the case where the direction in which the magnetic resistivity is minimized (direction of easy magnetization) is along the radial direction with respect to the rotating shaft (output shaft 51).
- the characteristics of the motor 1 can be improved. That is, by making the direction of easy magnetization oblique to the radial direction, the magnetic flux can be used more efficiently when the rotor 5 rotates in one direction.
- Modification 9 of the embodiment will be described below with reference to FIG. Configurations similar to those of the embodiment are denoted by the same reference numerals, and descriptions thereof are omitted.
- the outer peripheral portion 22 of Modification 9 is made of a non-oriented steel plate. That is, each of the plurality of steel plates 202 forming the outer peripheral portion 22 is a non-oriented steel plate.
- the configuration of the central core 21 is similar to that of the embodiment. That is, the plurality of teeth 4 are made of grain-oriented steel sheets.
- the stator 2 and the rotor 5 has a core including a oriented steel plate and a non-oriented steel plate.
- the stator 2 includes a core (stator core 20) including a oriented steel plate (steel plate 201) and a non-oriented steel plate (steel plate 202).
- the rotor 5 also includes a core (rotor core 6) including a oriented steel plate (steel plate 602) and a non-oriented steel plate (steel plate 601).
- the gaps between the plurality of outer peripheral pieces 220 of the outer peripheral portion 22 are made smaller than when the outer peripheral portion 22 is made of a oriented steel plate. Or it is easy to eliminate the gap.
- the steel plate 202 can be manufactured by punching a single plate, which is the base of the steel plate 202, into an annular shape. In this case, joints and gaps between the plurality of outer peripheral pieces 220 can be eliminated. Therefore, the magnetic resistance between the plurality of outer circumferential pieces 220 can be easily reduced compared to the case where the magnetic resistance between the plurality of outer circumferential pieces 220 is reduced by reducing the gaps between the plurality of outer circumferential pieces 220 in the embodiment. be able to.
- Modification 10 of the embodiment will be described below with reference to FIG. Configurations similar to those of the embodiment are denoted by the same reference numerals, and descriptions thereof are omitted.
- At least one of the stator 2 and the rotor 5 has a laminated core including a laminated structure of oriented steel plates and non-oriented steel plates.
- the outer peripheral portion 22 of the stator 2 is a laminated core including a laminated structure of oriented steel plates and non-oriented steel plates will be described.
- at least one of the central core 21 of the stator 2, the shaft holding portion 61 of the rotor 5, and the rotor body 62 may be a laminated core including a laminated structure of oriented steel plates and non-oriented steel plates.
- the configuration described below is also applicable when the central core 21 of the stator 2, the shaft holding portion 61 of the rotor 5, or the rotor body 62 is a laminated core including a laminated structure of oriented steel plates and non-oriented steel plates. It is possible.
- the outer peripheral portion 22 includes a plurality of oriented steel plates 202A and a plurality of non-oriented steel plates 202B.
- the outer peripheral portion 22 is formed by laminating a plurality of oriented steel plates 202A and a plurality of non-oriented steel plates 202B in the thickness direction.
- the plurality of oriented steel plates 202A and the plurality of non-oriented steel plates 202B are, for example, bonded with steel plates that are adjacent to each other in the thickness direction.
- a predetermined number of 1 or more (three in FIG. 14) of the plurality of oriented steel plates 202A are laminated.
- a predetermined number of oriented steel plates 202A are sandwiched between two non-oriented steel plates 202B.
- the outer peripheral portion 22 consists of repetition of such a structure.
- the non-oriented steel plate 202B can be manufactured by punching a single plate, which is the base of the non-oriented steel plate 202B, into an annular shape. In this case, it is possible to eliminate seams and gaps between the plurality of outer peripheral pieces 220 in the layer of the non-oriented steel plate 202B.
- the grain-oriented steel plate 202A is manufactured, as an example, in the same manner as the steel plate 202 of the embodiment (see “(10) Manufacturing method” and FIG. 5A). A seam 2200 is provided between 220 .
- the outer peripheral portion 22 can be assembled by laminating a plurality of non-oriented steel plates 202B and a plurality of oriented steel plates 202A in the thickness direction and connecting them by adhesion or the like. Even if each of the plurality of oriented steel plates 202A is separated (separated) into a plurality of parts with the seam 2200 as a boundary, the seam between the plurality of outer peripheral pieces 220 in the layer of the non-oriented steel plate 202B unconnected. Therefore, it is easy to arrange and assemble the plurality of portions of the grain-oriented steel plate 202A in a ring shape.
- the mechanical strength of the outer peripheral portion 22 is increased compared to the case where the layer of the non-oriented steel plate 202B has a seam. be able to.
- the number of oriented steel plates 202A is greater than the number of non-oriented steel plates 202B, but the number of oriented steel plates 202A may be less than or equal to the number of non-oriented steel plates 202B. That is, one or more predetermined number of non-oriented steel plates 202B may be sandwiched between two oriented steel plates 202A.
- the outer peripheral shape of the outer peripheral portion 22 is not limited to a polygon such as a regular dodecagon, and may be circular.
- the housing that accommodates the stator 2 and rotor 5 may hold the stator core 20 .
- the housing includes an endplate 9 (see FIG. 2) and a cover attached to the endplate 9 .
- the housing indirectly holds the stator core 20 by holding, for example, a pole passed through a through hole penetrating the stator core 20 in the axial direction of the output shaft 51 of the rotor 5 . Further, the housing holds the stator core 20 by sandwiching the stator core 20 from both axial sides of the output shaft 51 of the rotor 5, for example.
- the housing also holds, for example, a plurality of points on the outer edge of the stator core 20 .
- the motor 1 may include a holding member that holds the rotor 5 and rotates together with the rotor 5 .
- the holding member indirectly holds the rotor core 6 by, for example, holding a pole passed through a through hole penetrating the rotor core 6 in the axial direction of the output shaft 51 of the rotor 5 .
- the holding member holds the rotor core 6 by sandwiching the rotor core 6 from both axial sides of the output shaft 51 of the rotor 5, for example.
- rattling of the rotor 5 can be reduced. For example, rattling between the shaft holding portion 61 of the rotor 5 and the rotor body 62 and rattling between the plurality of fan-shaped portions 621 can be reduced.
- the steel plate 601 forming the shaft holding portion 61 of the rotor core 6 is manufactured by stretching a single plate, which is the base of the steel plate 601, while imparting directivity so that a plurality of fan-shaped portions 621 are arranged in an annular shape.
- a single plate which is the base of the steel plate 601
- the shape of the steel plate 601 when it is not bent is a shape in which the plurality of fan-shaped portions 621 are arranged in a ring. good too.
- the steel plate 201 forming the central core 21 of the stator core 20 is obtained by stretching a single plate, which is the base of the steel plate 201, so that a plurality of teeth 4 are arranged in an annular shape while imparting directionality. may be manufactured. That is, the shape of the steel plate 201 when not bent may be a shape in which a plurality of teeth 4 are arranged in a ring instead of the plurality of teeth 4 being arranged in a ring by bending the steel plate 201 . .
- Each of the plurality of permanent magnets 7 may be held by the rotor core 6 by magnetic attraction force between them without using an adhesive.
- a plurality of teeth 4 may be formed integrally with the outer peripheral portion 22 .
- the inner cylindrical portion 3 may be divided into a plurality of pieces in the regions between the plurality of teeth 4 .
- 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, an electrically assisted bicycle, or an electric vehicle.
- a power tool (10) includes a motor (1).
- a motor (1) has a stator (2) and a rotor (5).
- the rotor (5) rotates relative to the stator (2).
- At least one of the stator (2) and the rotor (5) has a core (stator core (20), rotor core (6)) containing grain-oriented steel sheets.
- the torque of the motor (1) can be increased compared to the case where the cores (stator core (20), rotor core (6)) include only non-oriented steel plates.
- At least one of the stator (2) and the rotor (5) includes a oriented steel plate and a non-oriented steel plate.
- a core (stator core (20), rotor core (6)) is provided.
- stator core (20), rotor core (6) not only oriented steel sheets but also non-oriented steel sheets that are easy to process are used, so the cores can be easily manufactured.
- At least one of the stator (2) and the rotor (5) is a laminate of oriented steel plates and non-oriented steel plates.
- a core (stator core (20), rotor core (6)) is provided as a laminated core including a structure.
- the cores (the stator core (20) and the rotor core (6)) using both the oriented steel sheets and the non-oriented steel sheets can be easily manufactured by laminating the oriented steel sheets and the non-oriented steel sheets. can be manufactured to
- the motor (1) is a brushless motor including a rotor (5) and a stator (2).
- the rotor (5) has a rotor core (6) and a plurality of permanent magnets (7).
- a plurality of permanent magnets (7) are held in the rotor core (6).
- a stator (2) has a stator core (20) and a plurality of coils (23).
- a stator core (20) is arranged around the rotor core (6).
- a plurality of coils (23) are wound around the stator core (20).
- At least one of the rotor core (6) and the stator core (20) is a core containing grain-oriented steel sheets.
- the torque of the brushless motor can be increased.
- the rotor core (6) includes a grain-oriented steel plate.
- the torque of the brushless motor can be increased.
- the plurality of permanent magnets (7) are arranged in a spoke shape around the center of the rotor core (6).
- the number of permanent magnets (7) per pole can be reduced.
- the stator core (20) includes a grain-oriented steel plate.
- the torque of the brushless motor can be increased.
- the stator core (20) has a cylindrical outer peripheral portion (22) and a plurality of teeth (4).
- the outer circumference (22) surrounds the rotor core (6).
- a plurality of teeth (4) protrude from the outer peripheral portion (22) toward the rotor core (6).
- a plurality of coils (23) are wound around the plurality of teeth (4).
- Each of the plurality of teeth (4) includes a grain-oriented steel plate in which the magnetic resistivity in the radial direction of the outer peripheral portion (22) is smaller than the magnetic resistivity in the circumferential direction of the outer peripheral portion (22).
- the outer peripheral portion (22) is made of non-oriented steel plate.
- the outer peripheral portion (22) can be manufactured more easily than when the outer peripheral portion (22) includes a grain-oriented steel plate.
- the stator core (20) has a cylindrical outer peripheral portion (22) and a plurality of teeth (4).
- the outer circumference (22) surrounds the rotor core (6).
- a plurality of teeth (4) protrude from the outer peripheral portion (22) toward the rotor core (6).
- a plurality of coils (23) are wound around the plurality of teeth (4).
- Each of the plurality of teeth (4) includes a grain-oriented steel plate in which the magnetic resistivity in the radial direction of the outer peripheral portion (22) is smaller than the magnetic resistivity in the circumferential direction of the outer peripheral portion (22).
- the outer peripheral portion (22) includes a grain-oriented steel plate having a smaller magnetic resistivity in the circumferential direction of the outer peripheral portion (22) than in the radial direction of the outer peripheral portion (22).
- iron loss in the outer peripheral portion (22) can be reduced compared to the case where the outer peripheral portion (22) does not include the grain-oriented steel plate.
- the grain-oriented steel plate of the core includes a radial portion.
- the direction in which the magnetic resistivity is minimized is along the radial direction with respect to the rotating shaft when viewed from the axial direction of the rotating shaft of the rotor (5).
- the characteristics of the radial portion relating to the rotation of the rotor (5) can be the same whether the rotor (5) rotates in one direction or in the opposite direction.
- the grain-oriented steel plate of the core includes an inclined portion.
- the direction in which the magnetic resistivity becomes minimum when viewed from the axial direction of the rotating shaft of the rotor (5) is oblique to the radial direction with respect to the rotating shaft.
- the core is a rotating shaft of the rotor (5). It includes a plurality of split cores that are split when viewed from the axial direction. A plurality of split cores are connected to each other.
- the cores (stator core (20), rotor core (6)) can be manufactured more easily than when the cores (stator core (20), rotor core (6)) are not split into a plurality of split cores.
- the plurality of split cores are connected by being fitted together.
- the power tool (10) according to the fourteenth aspect in the twelfth or thirteenth aspect, includes a filling part (402).
- a filling part (402) fills the gaps around the plurality of split cores.
- Configurations other than the first aspect are not essential configurations for the power tool (10) and can be omitted as appropriate.
- the motor (1) has a stator (2) and a rotor (5).
- the rotor (5) rotates relative to the stator (2).
- At least one of the stator (2) and the rotor (5) has a core (stator core (20), rotor core (6)) containing grain-oriented steel sheets.
- the torque of the motor (1) can be increased compared to the case where the cores (stator core (20), rotor core (6)) include only non-oriented steel plates.
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Abstract
Description
本実施形態の電動工具10(図3参照)は、図1、図2に示すように、モータ1を備えている。モータ1は、ステータ2と、ロータ5と、を有している。ロータ5は、ステータ2に対して回転する。ステータ2とロータ5とのうち少なくとも一方は、方向性鋼板を含むコアを備えている。本実施形態では、一例として、ステータ2は、方向性鋼板を含むステータコア20を備えており、ロータ5は、方向性鋼板を含むロータコア6を備えている。
図3に示すように、電動工具10は、モータ1と、電源101と、駆動伝達部102と、出力軸103と、チャック104と、先端工具105と、トリガボリューム106と、制御部107と、ハウジング108と、を備えている。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。
本実施形態のモータ1は、ブラシレスモータである。図1、図2に示すように、モータ1は、ロータ5と、ステータ2と、を有している。ロータ5は、ロータコア6と、複数(図1では10個)の永久磁石7と、出力軸51と、を有している。複数の永久磁石7は、ロータコア6に保持されている。ステータ2は、ステータコア20と、複数(図1では12個)のコイル23と、を有している。ステータコア20は、ロータコア6の周囲に配置されている。すなわち、ステータコア20は、ロータコア6を囲んでいる。複数のコイル23は、ステータコア20に巻かれている。ロータ5は、ステータ2に対して回転する。すなわち、複数のコイル23から発生する磁束が複数の永久磁石7に作用することにより、ロータ5が回転する。ロータ5のトルク(駆動力)は、出力軸51から駆動伝達部102(図3参照)へ伝達される。
ステータ2のステータコア20は、中央コア21と、外周部22と、を有している。
ロータ5のロータコア6は、ステータコア20の内筒部3と同心の円筒状に形成されている。ロータコア6の厚さとステータコア20の厚さとは等しい。本開示において、「等しい」とは、厳密に同じである場合に限定されず、許容される誤差の範囲内で異なっている場合も含む。
図2に示すように、モータ1は、エンドプレート9と、2つのベアリング52と、を更に備えている。エンドプレート9には、有底筒状のカバーが取り付けられる。エンドプレート9とカバーとにより、ハウジングが構成される。ステータ2及びロータ5は、エンドプレート9とカバーとに囲まれた空間に収容される。2つのベアリング52のうち一方は、カバーに固定されており、他方は、エンドプレート9に固定されている。2つのベアリング52は、ロータ5の出力軸51を回転可能に保持している。
上述の通り、ステータコア20及びロータコア6の各々は、複数の鋼板を含む。ここでは、ロータコア6の複数の鋼板について説明する。図2に示すように、ロータコア6は、複数の鋼板601と、複数の鋼板602と、を含んでいる。
次に、ステータコア20の複数の鋼板について説明する。図2に示すように、ステータコア20は、複数の鋼板201と、複数の鋼板202と、を含んでいる。
複数の永久磁石7の各々で発生する磁束は、ロータ本体62(扇状部621)の内部をロータコア6の径方向に移動して、ステータコア20に到達する。ここで、ロータ本体62における磁化容易方向は、ロータコア6の径方向(出力軸51に対するラジアル方向)に沿っている。つまり、磁化容易方向が磁束の方向に沿っている。そのため、ロータ本体62が無方向性鋼板のみを含む場合と比較して、ロータ本体62における鉄損を低減できる。
次に、ステータコア20の製造方法の一例について、図5A、図5Bを参照して説明する。
次に、ロータコア6の製造方法の一例について、図6を参照して説明する。
以下、実施形態の変形例1について、図7A、図7Bを参照して説明する。実施形態と同様の構成については、同一の符号を付して説明を省略する。
以下、実施形態の変形例2について、図8を参照して説明する。実施形態と同様の構成については、同一の符号を付して説明を省略する。
以下、実施形態の変形例3について、図9を参照して説明する。実施形態と同様の構成については、同一の符号を付して説明を省略する。
以下、実施形態の変形例4について、図10A、図10Bを参照して説明する。実施形態と同様の構成については、同一の符号を付して説明を省略する。
以下、実施形態の変形例5について、図11を参照して説明する。実施形態と同様の構成については、同一の符号を付して説明を省略する。
以下、実施形態の変形例6について、図12を参照して説明する。実施形態と同様の構成については、同一の符号を付して説明を省略する。
以下、実施形態の変形例7について、図13を参照して説明する。実施形態と同様の構成については、同一の符号を付して説明を省略する。
以下、実施形態の変形例8について、図4を参照して説明する。実施形態と同様の構成については、同一の符号を付して説明を省略する。
以下、実施形態の変形例9について、図4を参照して説明する。実施形態と同様の構成については、同一の符号を付して説明を省略する。
以下、実施形態の変形例10について、図14を参照して説明する。実施形態と同様の構成については、同一の符号を付して説明を省略する。
以下、実施形態のその他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。また、以下の変形例は、上述の各変形例と適宜組み合わせて実現されてもよい。
以上説明した実施形態等から、以下の態様が開示されている。
10 電動工具
2 ステータ
20 ステータコア
22 外周部
23 コイル
4 ティース
402 充填部
5 ロータ
6 ロータコア
7 永久磁石
Claims (15)
- ステータと、前記ステータに対して回転するロータと、を有するモータを備え、
前記ステータと前記ロータとのうち少なくとも一方は、方向性鋼板を含むコアを備える、
電動工具。 - 前記ステータと前記ロータとのうち少なくとも一方は、前記方向性鋼板と、無方向性鋼板と、を含む前記コアを備える、
請求項1に記載の電動工具。 - 前記ステータと前記ロータとのうち少なくとも一方は、前記方向性鋼板と、前記無方向性鋼板と、の積層構造を含む積層コアとしての前記コアを備える、
請求項2に記載の電動工具。 - 前記モータは、
ロータコアと、前記ロータコアに保持された複数の永久磁石と、を有する前記ロータと、
前記ロータコアの周囲に配置されたステータコアと、前記ステータコアに巻かれた複数のコイルと、を有する前記ステータと、を備えるブラシレスモータであり、
前記ロータコアと前記ステータコアとのうち少なくとも一方は、前記方向性鋼板を含む前記コアである、
請求項1~3のいずれか一項に記載の電動工具。 - 前記ロータコアは、前記方向性鋼板を含む、
請求項4に記載の電動工具。 - 前記複数の永久磁石は、前記ロータコアの中心を中心としてスポーク状に配置されている、
請求項5に記載の電動工具。 - 前記ステータコアは、前記方向性鋼板を含む、
請求項4~6のいずれか一項に記載の電動工具。 - 前記ステータコアは、
前記ロータコアを囲む筒状の外周部と、
前記外周部から前記ロータコアに向かって突出した複数のティースと、を有し、
前記複数のティースには、前記複数のコイルが巻かれ、
前記複数のティースの各々は、前記外周部の径方向における磁気抵抗率が前記外周部の周方向における磁気抵抗率よりも小さい前記方向性鋼板を含み、
前記外周部は、無方向性鋼板からなる、
請求項7に記載の電動工具。 - 前記ステータコアは、
前記ロータコアを囲む筒状の外周部と、
前記外周部から前記ロータコアに向かって突出した複数のティースと、を有し、
前記複数のティースには、前記複数のコイルが巻かれ、
前記複数のティースの各々は、前記外周部の径方向における磁気抵抗率が前記外周部の周方向における磁気抵抗率よりも小さい前記方向性鋼板を含み、
前記外周部は、前記外周部の周方向における磁気抵抗率が前記外周部の径方向における磁気抵抗率よりも小さい前記方向性鋼板を含む、
請求項7に記載の電動工具。 - 前記コアの前記方向性鋼板は、前記ロータの回転軸の軸方向から見て、磁気抵抗率が最小となる方向が前記回転軸に対するラジアル方向に沿っているラジアル部を含む、
請求項1~9のいずれか一項に記載の電動工具。 - 前記コアの前記方向性鋼板は、前記ロータの回転軸の軸方向から見て、磁気抵抗率が最小となる方向が前記回転軸に対するラジアル方向に対して斜め方向である傾斜部を含む、
請求項1~10のいずれか一項に記載の電動工具。 - 前記コアは、前記ロータの回転軸の軸方向から見て分割された複数の分割コアを含み、
前記複数の分割コアは、互いに連結されている、
請求項1~11のいずれか一項に記載の電動工具。 - 前記複数の分割コアは、互いに嵌め合わされることにより連結されている、
請求項12に記載の電動工具。 - 前記複数の分割コアの周囲の隙間を埋める充填部を備える、
請求項12又は13に記載の電動工具。 - ステータと、前記ステータに対して回転するロータと、を有するモータであって、
前記ステータと前記ロータとのうち少なくとも一方は、方向性鋼板を含むコアを備える、
モータ。
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US18/272,968 US20240079928A1 (en) | 2021-01-27 | 2021-01-27 | Electric tool and motor |
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WO2024220622A1 (en) * | 2023-04-18 | 2024-10-24 | Milwaukee Electric Tool Corporation | Power tool motor rotor configurations |
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